The application is a divisional application of China patent application No. 202080098025.3, the application date of the original application is 5-12 days in 2020, the application number is 202080098025.3, and the application is named as an automatic injection device and a using method thereof.
Disclosure of Invention
The invention provides an automatic injection device and a use method thereof, which can meet various requirements in use.
The technical scheme of the invention is as follows:
An automatic injection device consisting essentially of a powered drive assembly, a housing assembly providing external protection, and a syringe containing a medicament;
The driving assembly comprises an outer lock sleeve and a distal end cover, wherein the outer lock sleeve and the distal end cover are connected with each other, the outer lock sleeve can axially and oppositely move relative to the distal end cover, and the distal end cover is connected with the shell assembly;
The device further comprises a compressed first elastic energy storage element arranged between the outer lock sleeve and the distal end cover, an inner lock sleeve detachably connected to the distal end cover and sleeved in the outer lock sleeve, a push rod sleeved in the inner lock sleeve and penetrating through the outer lock sleeve, and a compressed second elastic energy storage element positioned in the push rod and arranged between the push rod and the distal end cover; wherein,
The outer lock sleeve is provided with an unlocking groove;
the inner lock sleeve is provided with a protrusion feature protruding inwards, and the push rod is correspondingly provided with a through hole for accommodating the protrusion feature;
When the outer lock sleeve is triggered to move relative to the distal end cover, the first elastic energy storage element is pressed to further store energy, and the unlocking groove moves outside the protruding feature of the inner lock sleeve along with the outer lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move so as to push the medicament in the syringe to be discharged.
As a preferred embodiment of the automatic injection device of the present invention, a surface of the protruding feature of the inner lock sleeve facing the distal end cover is a slope angled with respect to the pushing direction of the second elastic energy storage element, and a surface of the slope of the through hole on the push rod corresponding to the protruding feature is in contact with the slope and is also a slope.
As a preferred embodiment of the automatic injection device according to the present invention, the protruding feature is provided on a rod, one end of the rod is fixed to the inner lock sleeve, the other end is a free end, and an open space is provided around the rod; the protruding feature and the lever are provided in one or more.
As a preferred embodiment of the automatic injection device of the present invention, the outer lock sleeve is provided with a surface protrusion, and the distal end cover is provided with a chute at a corresponding position; the surface protrusions are arranged in the sliding grooves at the corresponding positions of the distal end cover, so that the outer lock sleeve and the distal end cover are connected with each other; and, the surface protrusion is axially slidable within the chute; the surface protrusion of the outer sleeve is closer to the end of the outer sleeve than the unlocking groove.
As a preferred embodiment of the automatic injection device of the present invention, the inner lock sleeve has a distal protrusion, the distal end cap is provided with a distal groove at a corresponding position, and the distal protrusion of the inner lock sleeve is correspondingly engaged with the distal groove of the distal end cap, so as to fix one end of the inner lock sleeve with the distal end cap.
As a preferred embodiment of the automatic injection device of the present invention, the distal end cap is further provided with a central rod, the second elastic energy storage element is sleeved on the central rod, and one end of the second elastic energy storage element is abutted against the end of the distal end cap, and the other end of the second elastic energy storage element is abutted against the inner surface of the end of the push rod.
As a preferred embodiment of the automatic injection device according to the present invention, the outer surface of the outer lock sleeve is provided with guide protrusions which cooperate with corresponding structures of the housing assembly to limit the circumferential rotation of the outer lock sleeve.
As a preferred embodiment of the automatic injection device of the present invention, the distal end cover is provided with a cantilever protrusion, the cantilever protrusion is arranged on the outer surface of the distal end cover in a protruding manner, and the distal end cover is fixedly connected with the housing assembly through the cantilever protrusion, so as to limit the axial separation of the driving assembly and the housing assembly.
As a preferred embodiment of the automatic injection device according to the present invention, the outer lock sleeve has a proximal end inner hole, the driving assembly of the automatic injection device further comprises a tooth slot and a toothed ring sequentially provided in the proximal end inner hole of the outer lock sleeve from outside to inside, and the tooth slot is fixed on the outer lock sleeve, and the push rod passes through the tooth slot and the toothed ring; the tooth grooves are matched with the push rod through hole shafts and cannot rotate relatively; the push rod is provided with a spiral track, a sliding block protrusion is arranged in an inner hole of the toothed ring, and the sliding block protrusion is arranged in the spiral track; the outer surface of the toothed ring is provided with an elastic arm, a circumferential tooth groove is arranged at a position corresponding to the inner hole of the tooth groove, the elastic arm is tensioned in the circumferential tooth groove, and the tail end of the elastic arm is provided with a tooth poking part capable of being inserted into the circumferential tooth groove.
As a preferred embodiment of the automatic injection device of the present invention, the tooth slot has a snap feature, and accordingly, the outer lock sleeve has a receiving groove, the shape of the snap feature is adapted to the shape of the receiving groove, the snap feature of the tooth slot is installed in the receiving groove of the outer lock sleeve, and the tooth slot is fixed to the outer lock sleeve to prevent relative rotation.
As a preferred embodiment of the automatic injection device of the present invention, the drive assembly further comprises a reset sleeve disposed within the outer sleeve; the reset lock sleeve comprises a reset inclined plane which can be pushed by the trigger force born by the outer lock sleeve so as to rotate the reset lock sleeve; the reset lock sleeve further comprises a reset locking piece, the outer lock sleeve is further provided with a reset stop corresponding to the reset locking piece, and the reset stop is blocked at the proximal end of the reset locking piece after the reset lock sleeve rotates and after the outer lock sleeve returns to the original position under the pushing of the first elastic energy storage element.
As a preferred embodiment of the automatic injection device of the present invention, the outer lock sleeve has a thick portion at a proximal end and a thin portion at a distal end, the reset lock sleeve includes a large caliber portion and a small caliber portion, the large caliber portion of the reset lock sleeve is disposed in an inner hole of the thick portion of the outer lock sleeve, and the small caliber portion of the reset lock sleeve is disposed in an inner hole of the thin portion of the outer lock sleeve; the small caliber part of the reset lock sleeve is opposite to the end part of the inner lock sleeve.
As a preferred embodiment of the automatic injection device according to the present invention, the reset lock is in a rod shape extending in an axial direction at an edge of the large caliber portion of the reset lock sleeve, and has an extension portion extending outward in a radial direction at an end portion thereof.
As a preferred embodiment of the automatic injection device, the inner surface of the outer lock sleeve is provided with a limit strip, the edge of the bottom surface of the large-caliber part of the reset lock sleeve is provided with a corresponding clamping groove, and the limit strip of the outer lock sleeve is clamped in the clamping groove of the reset lock sleeve, so that the relative rotation between the reset lock sleeve and the outer lock sleeve is prevented; and the length of the limiting strip is further set to ensure that the limiting strip is separated from the clamping groove when the reset lock sleeve is pushed, so that the reset lock sleeve can rotate along the circumferential direction relative to the outer lock sleeve.
As a preferred embodiment of the automatic injection device of the present invention, the housing assembly comprises a proximal end cap, a trigger sleeve and a housing, the trigger sleeve is mounted in an inner hole of the housing from a proximal direction, the proximal end cap is mounted on an outer surface of the trigger sleeve from a proximal direction in a nested manner, the trigger sleeve is used for applying a trigger force to the outer lock sleeve, and the needle of the syringe is protected after the outer lock sleeve is pushed and reset by the first elastic energy storage element.
As a preferred embodiment of the automatic injection device according to the invention, the trigger sleeve is provided with a catch, the housing is provided with a stop feature, and after the trigger sleeve is mounted in the housing, the catch of the trigger sleeve is limited by the stop feature inside the housing, preventing the trigger sleeve from falling out in the housing.
As a preferred embodiment of the automatic injection device of the present invention, the proximal end cap is provided with a protrusion, the trigger sleeve is provided with a groove, and the protrusion of the proximal end cap is buckled in the groove of the trigger sleeve, so that the proximal end cap and the trigger sleeve are mounted.
Based on the same inventive concept, the invention also provides a use method of the automatic injection device, which comprises the following steps:
applying a trigger force or signal to the outer sleeve to move the outer sleeve relative to the distal end cap while the first elastic energy storage element is further compressed;
When the unlocking groove of the outer lock sleeve moves beyond the protruding feature of the inner lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move so as to realize feeding;
and after the feeding is finished, removing the trigger force or the trigger signal, and pushing the outer lock sleeve to reset by the first elastic energy storage element.
Preferably, the trigger force or trigger signal is applied through a trigger sleeve in the housing assembly.
Based on the same inventive concept, the present invention also provides an automatic injection device consisting essentially of a powered drive assembly, a housing assembly providing external protection, and a syringe containing a medicament;
The driving assembly comprises an outer lock sleeve and a distal end cover, wherein the outer lock sleeve and the distal end cover are connected with each other, the outer lock sleeve can axially and oppositely move relative to the distal end cover, and the distal end cover is connected with the shell assembly;
The device further comprises a compressed first elastic energy storage element arranged between the outer lock sleeve and the distal end cover, an inner lock sleeve detachably connected to the distal end cover and sleeved in the outer lock sleeve, a push rod sleeved in the inner lock sleeve and penetrating through the outer lock sleeve, and a compressed second elastic energy storage element positioned in the push rod and arranged between the push rod and the distal end cover; wherein,
The outer lock sleeve is provided with an unlocking groove;
the inner lock sleeve is provided with a protrusion feature protruding inwards, and the push rod is correspondingly provided with a through hole for accommodating the protrusion feature;
The outer lock sleeve is provided with a proximal inner hole, the driving assembly further comprises a reset lock sleeve, a tooth socket and a toothed ring which are sequentially arranged in the proximal inner hole of the outer lock sleeve from outside to inside, the tooth socket is fixed on the outer lock sleeve, and the push rod penetrates through the tooth socket and the toothed ring; the tooth grooves are matched with the push rod through hole shafts and cannot rotate relatively; the push rod is provided with a spiral track, a sliding block protrusion is arranged in an inner hole of the toothed ring, and the sliding block protrusion is arranged in the spiral track; the outer surface of the toothed ring is provided with an elastic arm, the tooth groove is provided with a circumferential tooth groove at a position corresponding to the inner hole, the elastic arm is tensioned in the circumferential tooth groove, and the tail end of the elastic arm is provided with a tooth poking part capable of being inserted into the circumferential tooth groove;
The reset lock sleeve comprises a reset inclined plane, the reset inclined plane can be pushed by the trigger force borne by the outer lock sleeve so as to enable the reset lock sleeve to rotate, the position of the reset inclined plane is set to enable the trigger force to trigger the outer lock sleeve to axially move, and after a certain distance, the reset inclined plane is triggered to enable the reset lock sleeve to rotate; the reset lock sleeve further comprises a reset lock, and the outer lock sleeve is further provided with a reset stop corresponding to the reset lock, wherein after the reset lock sleeve rotates and after the outer lock sleeve returns to the original position under the pushing of the first elastic energy storage element, the reset stop can be blocked at the proximal end of the reset lock;
When the outer lock sleeve is triggered to move relative to the distal end cover, the first elastic energy storage element is pressed to further store energy, and the unlocking groove moves outside the protruding feature of the inner lock sleeve along with the outer lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move so as to push the medicament in the syringe to be discharged; when the push rod is fed into place, the triggering force is removed, and the first elastic energy storage element can push the outer lock sleeve to return to the original position.
Preferably, the housing assembly includes a trigger sleeve for applying a trigger force to the outer lock sleeve and the reset lock sleeve.
Based on the same inventive concept, the invention also provides a triggering, signal feedback, resetting and locking method of the automatic injection device, which comprises the following steps:
Applying a trigger force or signal to the outer sleeve to move the outer sleeve relative to the distal end cap while the first elastic energy storage element is further compressed; after a preset time or distance, the trigger force or trigger signal is applied to the reset lock sleeve to enable the reset lock sleeve to rotate;
when the unlocking groove of the outer lock sleeve moves beyond the protruding feature of the inner lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move so as to realize feeding; the push rod drives the toothed ring to rotate in the tooth slot while feeding, and the elastic arm of the toothed ring collides with the circumferential tooth slot of the tooth slot to make a sound so as to realize signal feedback;
after feeding is completed, the triggering force or the triggering signal is removed, the first elastic energy storage element pushes the outer lock sleeve to reset, the outer lock sleeve rotates based on the reset lock sleeve, and after the outer lock sleeve resets, the reset stop is blocked outside the reset locking of the reset lock sleeve, so that the automatic injection device is prevented from being triggered again, and locking is realized.
Compared with the prior art, the invention has the following beneficial effects:
1. the automatic injection device is a modularized device with a pure mechanical structure, and therefore, the automatic injection device has the inherent properties of high reliability and good stability of the mechanical structure.
2. The automatic injection device integrates multiple functions of triggering, energy storage, sounding feedback, resetting, locking and the like, and has a plurality of functional characteristics and perfect triggering starting and automatic transmission characteristics; according to the invention, through reasonable arrangement of the transmission structure and the scheme, the functions of releasing spring energy storage, pushing action, sounding feedback and resetting and locking after injection can be automatically completed by one-time triggering, so that the integration level of the device is greatly improved, and the complexity of the operation process is reduced; on the premise of high integration level of the automatic injection device, the automatic protection of the needle after use can be realized, and the safety requirement of the device is improved.
3. The sounding feedback function of the automatic injection device can be used as an interface of information interaction, and sound is sent to the outside through specific sound feedback and touch feedback, so that the functional state of the device can be monitored by a user, and the user can conveniently control or execute decision in the next step. The information transfer path during operation is from device to person and then from person to device. Therefore, the device has the attribute of a closed-loop system, and the safety and the reliability of the device in the operation process can be greatly improved.
4. The automatic injection device of the invention can be used as a multifunctional automatic injection device and can be combined and applied to various injection occasions (such as specific subdivision fields of chronic disease treatment, first-aid treatment, diagnosis and the like), and the clinical applicability of the technical scheme is very wide;
5. The functions of triggering, energy storage, sounding feedback, resetting and locking contained in the automatic injection device can be reasonably matched in a device mode according to different using target groups (such as universities, scientific research institutions, enterprises, educational systems, medical systems and the like), can be manufactured by using metal materials or polymer materials, and can be used as a reusable or disposable automatic injection device.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Detailed Description
The present invention provides an automatic injection device that can be used to automatically push a liquid agent, which can be an injectable drug, into a container of the device after triggering. The present invention also relates to a configuration and/or assembly method of an automatic injection device configured to combine triggering, energy storage, audible feedback, reset, locking functions. The automatic injection device is mainly applied to the field of medical instruments and equipment and aims at the use occasion of self-injection treatment or auxiliary injection treatment of other people. The invention designs the automatic injection device which can automatically trigger, automatically execute pushing action after triggering, and automatically reset and lock after finishing pushing action by reasonably configuring each transmission part on the transmission assembly of the automatic injection device and comprising structural characteristics arranged on each transmission part. Meanwhile, according to the requirements of different use occasions, the sounding feedback mechanism and/or sounding feedback structural characteristics can be flexibly arranged in the automatic injection device, the sounding size and sounding response interval of the device can be adjusted, the sounding feedback function of the automatic injection device is further expanded, and the automatic injection device can adapt to various operation scenes.
Currently, automatic injection devices are mainly designed to automatically perform a pushing action, by releasing a spring compressed in the injection device, the spring force is released and acts on a push rod, which delivers the liquid agent inside the injection device to the outside of the automatic injection device or to the human/animal body through a pushing piston via an injection needle.
The above is a main function of the automatic injection device, but the application scene of the automatic injection device is complex and changeable, and the automatic injection device itself should be developed towards the direction of integration, multifunction and easy operation so as to adapt to the complex and changeable application scene.
For example, for emergency situations where emergency use is required, it is desirable to reduce the flow of operations as much as possible. Typical automatic injection devices require the process of disengaging needle protection, aligning the injection site, triggering a button injection, and removing the injection site. Complicated procedures can lead to the patient missing the optimal treatment time. Therefore, it is necessary to expand the automation characteristics of the automatic injection device, to time-sequence card more dispersed operation processes and to integrate the functions as much as possible on the same device, so that the functional points of the automatic injection device can be more integrated, and to reduce the operation complexity as much as possible when facing emergency, and to complete all the automatic injection functions through one or two operation processes as much as possible.
For another example, for patients requiring long-term treatment, with poor perceptibility, more operational cues are often required to inform the operational status of the automatic injection device during use of the automatic injection device. A general operation prompt is to visually distinguish between different states before and after use, so that it is necessary to expand functional characteristics and add audible or tactile prompts.
For example, the safety of the device is also considered in combination with the automation characteristic, so that the anti-false-touch function is good before the use, and the injection needle at the end of the injector can be protected by the device after the use, thereby avoiding the injury to the human body.
In response to the above-identified needs, the present invention provides an automatic injection device.
The automatic injection device provided by the invention can independently complete the time sequence combination functions of triggering, energy storage, sounding feedback, resetting and locking, and can automatically complete the functions of releasing spring energy storage, pushing action, sounding feedback and resetting and locking after injection by one-time triggering through reasonably arranging a transmission structure and a scheme, so that the integration level of the device is greatly improved, the complexity of an operation process is reduced, the automatic protection of a needle after use can be realized on the premise of high integration level of the automatic injection device, and the safety requirement of the device is improved, so that the automatic injection device has a truly and more comprehensive automatic meaning.
The invention also extends the audible feedback function of the automatic injection device. In the production process, the sounding feedback function of the injection device in the use process can be further enriched and diversified by adjusting the sizes of structural members related to sounding sizes and response intervals.
The automatic injection device adopts a nested design in structure, has high integration level of component combination, and can greatly reduce the production cost by using a high polymer material when mass production is required to be carried out in face of market demands. The advantages of large production batch and low cost of the polymer device are combined, the device can be expanded from the occasion of repeated use to the occasion of disposable use, the automatic injection device is ensured to be always used and new, and the stability of the device in the service period is improved.
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples
The present embodiments relate to an automatic injection device configured to combine triggering, resetting, locking, energy storage, audible feedback, etc. functions, the device being in its original state after production and assembly as shown in fig. 1. An exploded view of the components of the automatic injection device is shown in fig. 2.
As can be seen in fig. 2, the automatic injection device comprises the following components:
tooth slot 1;
A toothed ring 2;
Resetting the lock sleeve 3;
An outer lock sleeve 4;
A push rod 5;
An inner lock sleeve 6;
A distal end cap 7;
A return spring 8;
a feed spring 9;
A syringe 10;
A proximal end cap 11;
A trigger sleeve 12;
A housing 13.
The structure and mounting relationship of the above-described components will be described below with reference to other drawings. In the following description, proximal refers to the end proximal to the body part receiving the injection and distal to the end distal to the body part receiving the injection.
Referring to fig. 3 and fig. 4 in combination, fig. 3 is a schematic perspective view of a tooth slot 1, fig. 4 is a schematic perspective view of a tooth ring 2, and the tooth slot 1 and the tooth ring 2 are main components of a sounding feedback function.
As shown in fig. 3, the body of the tooth slot 1 is cylindrical, the outer surface of the tooth slot 1 is provided with two convex strips 1a with the same length, one end of each convex strip 1a is provided with a buckling feature 103, the main body part of the tooth slot 1 corresponding to the buckling feature 103 is provided with an opening, the side surface of the buckling feature 103 is a smooth transition cambered surface from the distal end to the proximal end, and the buckling feature 103 can be matched with a corresponding structure on the outer lock sleeve 4 to connect the tooth slot 1 to the outer lock sleeve 4, so that the tooth slot 1 cannot circumferentially rotate relative to the outer lock sleeve 4.
The tooth slot 1 is also formed with an end face hole 101, which end face hole 101 is in particular located at the other end opposite the snap feature 103. The end face hole 101 is non-circular, and the specific shape corresponds to a circular shape obtained by cutting out upper and lower circular arc portions at the upper and lower ends of a circular shape with two straight lines parallel to each other. The end face hole 101 can cooperate with a corresponding structure of the push rod 5 for limiting the circumferential rotational movement of the push rod 5 such that the push rod 5 can only perform a translational movement in the axial direction.
The tooth slot 1 has an inner cavity larger than the end face hole 101, and a circumferential tooth slot 102 is formed on the surface of the inner cavity, and the circumferential tooth slot 102 is formed by surrounding a plurality of teeth 102a in sequence. The circumferential tooth grooves 102 are used for realizing the sounding feedback function in cooperation with the corresponding structure of the toothed ring 2.
Referring to fig. 4, the body portion of the ring gear 2 is cylindrical, and the ring gear 2 is nested in the internal cavity of the slot 1. Specifically, the toothed ring 2 has two elastic arms 201, and the two elastic arms 201 are arranged in a central symmetry manner along the circumferential direction of the toothed ring 2; one end of each elastic arm 201 is fixed on the outer peripheral side of the toothed ring 2, the other end is a free end, and the free end is provided with a tooth pulling part 2011 which is matched with the circumferential tooth groove 102 of the tooth groove 1 to realize a sound production function. The toothed ring 2 is tensioned in the circumferential tooth space 102 of the tooth space 1 by two elastic arms 201, and the tooth-pulling portions 2011 of each elastic arm 201 are respectively located in the tooth spaces between adjacent teeth 102a of the circumferential tooth space 102. When the ring gear 2 rotates circumferentially with respect to the tooth groove 1, the tooth pulling portion 2011 of the elastic arm 201 of the ring gear 2 slides in the tooth groove between the plurality of teeth 102a on the circumferential tooth groove 102 of the tooth groove 1, and rattles, thereby realizing the sound feedback function.
In addition, the tooth ring 2 is also provided with slider protrusions 202 protruding inward at the inner surface of the inner hole 203 thereof, and the slider protrusions 202 are provided in two, which two slider protrusions 202 are provided opposite to each other. The sliding block protrusion 202 is used for being matched with a corresponding structure of the push rod 5, so that the push rod 5 drives the toothed ring 2 to rotate along the circumferential direction when moving along the axial direction.
Fig. 5 is a schematic perspective view of the reset lock sleeve 3.
As shown in fig. 5, the reset lock sleeve 3 includes a large-caliber portion 31 and a small-caliber portion 32, and has an inner hole 33 therethrough.
The edge of the large diameter portion 31 is provided with a reset lock 301. The reset locks 301 are respectively arranged in one direction and two in total in the opposite direction; each reset lock 301 is in a rod shape extending in the axial direction at the bottom surface edge of the large-caliber portion 31 of the reset lock sleeve 3 in a direction away from the small-caliber portion 32, and has an extension 3011 protruding radially outward at the end thereof away from the small-caliber portion 32.
The large diameter portion 31 of the reset lock sleeve 3 is further provided with a reset portion 303, the reset portion 303 and the reset lock 301 are extended in the same direction, the reset portion 303 has a reset inclined surface 302, and the reset inclined surface 302 is used for being pressed and triggered by a trigger force to enable the reset lock sleeve 3 to rotate in the circumferential direction. The reset portions 303 are provided one by one in the opposite direction, and two in total. In fig. 5, the reset portion 303 is located closer to the reset lock 301 in the circumferential direction.
In addition, two radially opposite clamping grooves 311 are further arranged at the bottom edge of the large-caliber part 31 of the reset lock sleeve 3, and the clamping grooves 311 are used for being matched with corresponding structures of the outer lock sleeve 4 to prevent the reset lock sleeve 3 and the outer lock sleeve 4 from rotating circumferentially within a certain axial distance range.
Referring to fig. 6, a schematic perspective view of the outer lock sleeve 4 is shown.
As shown in fig. 6, the outer jacket 4 includes two parts, a thick part 41 and a thin part 42, the thick part 41 and the thin part 42 have outer walls, respectively, and transition is made between the thick part 41 and the thin part 42 through a transition stage. The thick portion 41 and the thin portion 42 have a hollow inner cavity penetrating therethrough, respectively.
Specifically, the outer lock sleeve 4 is provided with surface protrusions 406 at the thin portion 42, and in fig. 6, the outer lock sleeve 4 is provided with two surface protrusions 406, the two surface protrusions 406 are disposed opposite to each other, and the shape of the surface protrusions 406 is in a prismatic shape; the surface protrusions 406 are adapted to cooperate with corresponding structures of the distal end cap 7 to effect and guide the axial movement of the outer sleeve 4 relative to the distal end cap 7.
In addition, the outer lock sleeve 4 further includes the following structure:
The unlocking grooves 405 are formed in the thin portion 42, specifically, two unlocking grooves 405 are formed, and the two unlocking grooves 405 are formed opposite to each other; unlocking groove 405 is closer to the proximal end than surface protrusion 406 and is disposed circumferentially offset from surface protrusion 406;
The guide protrusions 404 provided on the thick portion 41, specifically, two guide protrusions 404 are provided, and two of the guide protrusions 404 are provided opposite to each other; the guide protrusion 404 may limit the rotation of the outer lock sleeve 4 in the circumferential direction with respect to the housing 13, specifically, after the outer lock sleeve 4 is mounted in the housing 13, the guide protrusion 404 is disposed in a sliding groove or track disposed inside the housing 13, and the circumferential dimension of the sliding groove or track is matched with the guide protrusion 404, thereby limiting the rotation of the outer lock sleeve 4 in the circumferential direction. A specific mating structure of the guide projection 404 of the outer sleeve 4 and the chute or track 131 in the housing 13 is shown in fig. 7;
The sliding grooves 403 provided on the thick portion 41, specifically, two sliding grooves 403 are provided, and two sliding grooves 403 are provided opposite to each other; in fig. 6, the chute 403 is specifically T-shaped; the sliding groove 403 is used for accommodating the buckling feature 103 of the tooth groove 1, so that the tooth groove 1 is fixed on the outer lock sleeve 4, and the tooth groove 1 and the outer lock sleeve cannot rotate relatively;
Reset stops 402 provided on the thick portion 41, specifically, two reset stops 402 are provided, and two reset stops 402 are provided opposite to each other; in fig. 6, the reset stop 402 is a stop formed by an L-shaped aperture with one end of one section communicating axially outwardly and the other section of the L-shaped aperture being located distally of the reset stop 402;
A trigger surface 401 provided on the thick portion 41, specifically, the trigger surface 401 is an inner surface of a V-shaped groove, and the trigger surface 401 is provided in two in opposite directions of the thick portion 41;
Two stopper bars 407 provided on the inner surface of the thick portion 41, and the two stopper bars 407 are provided opposite to each other. The limit strips 407 are used for being matched with two clamping grooves 311 on the edge of the bottom surface of the large-caliber part 31 of the reset lock sleeve 3, so that the locking and unlocking of the relative rotation of the outer lock sleeve 4 and the reset lock sleeve 3 along the axis are realized. Specifically, in the original state after the automatic injection device is installed, the limit strips 407 of the outer lock sleeve 4 are clamped in the clamping grooves 311 of the reset lock sleeve 3, so that the relative rotation between the reset lock sleeve 3 and the outer lock sleeve 4 is prevented; when the outer lock sleeve 4 is pressed by the trigger force to move along the direction approaching to the distal end cover 7 in the axial direction, the reset inclined plane 302 of the reset lock sleeve 3 is then pressed and triggered by the trigger force after a period of time, and at this time, along with the axial movement of the outer lock sleeve 4, the limit strips 407 are separated from the clamping grooves 311, so that the reset lock sleeve 3 can rotate along the circumferential direction relative to the outer lock sleeve 4 under the action of the trigger force.
Referring to fig. 8, a schematic perspective view of the push rod 5 is shown, and the push rod 5 is a cylinder with an opening at one end and an inner cavity.
As shown in fig. 8, the push rod 5 has an end surface feature 501, the end surface feature 501 is non-circular matching with the end surface hole 101 of the tooth slot 1, as can be seen from fig. 8, the shape of the end surface feature 501 extends along the length direction of the push rod 5 and covers most of the push rod 5, and the tooth slot 1 is matched with the non-circular hole shaft of the push rod 5 through the structural arrangement, so that the tooth slot 1 can limit the push rod 5 from rotating when feeding through the end surface hole 101, and the push rod 5 can only perform translational motion along the axial direction. The end surface of the push rod 5 and the tooth groove 1 are matched with each other as shown in fig. 9.
As shown in fig. 8, the outer surface of the push rod 5 has two spiral tracks 502 recessed inward, and the two spiral tracks 502 are symmetrically arranged at 180 degrees on the outer surface of the push rod 5; the spiral track 502 is used for being matched with the sliding block protrusion 202 of the toothed ring 2, so that when the push rod 5 moves axially, the toothed ring 2 is driven to rotate circumferentially, the toothed ring 2 is further rotated relative to the tooth slot 1, the tooth poking part 2011 of the elastic arm 201 of the toothed ring 2 rotates in the circumferential tooth slot 102 of the tooth slot 1 and collides with the circumferential tooth slot 102 to generate sound, and the sound feedback function in the feeding process of the push rod 5 is realized. The schematic cooperation of the push rod 5 and the toothed ring 2 is shown in fig. 9.
Referring again to fig. 8, the push rod 5 is provided with two symmetrical through holes 503 at a portion near the distal end, and the through holes 503 are used for matching with corresponding structures of the inner lock sleeve 6 to realize locking in the original state and unlocking in the triggered state. And, the inner surface of the through hole 503 on the distal end side is a slope, and the slope direction of the slope facilitates the pushing rod 5 to be pushed out in the axial direction.
Referring to fig. 10, a schematic structure of the inner lock sleeve 6 is shown.
As shown in fig. 10, the inner lock sleeve 6 is provided with two protruding features 601 protruding inward, the two protruding features 601 are disposed opposite each other, each protruding feature 601 is disposed on one rod 61, and an empty groove 60 is provided around each rod 61. Each protruding feature 601 of the inner sleeve 6 correspondingly mates with the through hole 503 of the push rod 5. In the original state of the automatic injection device, each protruding feature 601 of the inner lock sleeve 6 is inserted into a corresponding through hole 503 of the push rod 5, thereby fixing the push rod 5 to the inner lock sleeve 6, while the protruding feature 61 of the inner lock sleeve 6 is simultaneously limited by the outer lock sleeve 4 sleeved outside thereof and cannot be expanded circumferentially, so that the feed spring 9 cannot push the push rod 5 to move axially. More preferably, a surface of each protruding feature 601 of the inner sleeve 6 facing the distal end cap 7 is a bevel angled with respect to the pushing direction of the feed spring 9, in particular a bevel with a low proximal end and a high distal end, and the bevel of the through hole 503 on the push rod 5 is in abutment with the bevel of the protruding feature 601 of the inner sleeve 6. This arrangement facilitates the feeding of the push rod 5 axially proximally by the feed spring 9 in the triggered state.
Referring again to fig. 10, the distal end of the inner sleeve 6 has terminal protrusions 602, the terminal protrusions 602 are provided in two, and the two terminal protrusions 602 are disposed opposite to each other. The inner sleeve 6 is removably attached to the distal end cap 7 by two end projections 602.
Referring to fig. 11, a schematic structural view of the distal end cap 7 is shown.
The distal end cap 7 has the following structure:
The base 71, in fig. 11, is a circular plate;
A cylindrical portion 72 formed to extend vertically outward along one surface of the base 71, and a central axis of the cylindrical portion 72 coincides with a central axis of the distal end cap 7; the cylindrical portion 72 is provided with a chute 702, specifically, two chutes 702 are provided, and the two chutes 702 are provided opposite to each other; the sliding groove 702 is used for being matched with the surface protrusion 406 of the outer lock sleeve 4, and the surface protrusion 406 of the outer lock sleeve 4 is arranged in the sliding groove 702 at the corresponding position of the distal end cover 7, namely, the interconnection of the outer lock sleeve 4 and the distal end cover 7 is realized; and, the surface protrusion 406 is axially slidable within the chute 702. Preferably, the length of the surface protrusion 406 along the circumferential direction of the outer lock sleeve 4 matches the length of the chute 702 along the circumferential direction of the distal end cap 7, thereby functioning as a guide for movement and preventing the outer lock sleeve 4 from rotating in the circumferential direction relative to the distal end cap 7;
A tip groove 703 provided at a bottom portion of the cylindrical portion 72 at a position where the bottom portion meets the base 71; according to the illustration in fig. 11, two end grooves 703 are provided (the other end groove is not visible in the drawing), and the two end grooves 703 are provided opposite to each other; in fig. 11, each end groove 703 further includes protrusions 703a provided on both sides of the groove body;
The central rod 701 is arranged along the axial direction of the distal end cover 7, one end of the central rod is fixed on the base 71 of the distal end cover 7, and the other end is a free end; and, the center rod 701 is located inside the cylindrical portion 72;
Cantilever protrusions 704 protruding from an outer surface of the cylindrical portion 72 and having hooks, and in the structure shown in fig. 11, two cantilever protrusions 704 are provided in total, the two cantilever protrusions 704 being disposed opposite to each other; the distal end cap 7 is fixedly connected to the housing 13 by two cantilevered protrusions 704, the cantilevered protrusions 704 limiting axial separation of the distal end cap 7 from the housing 13. One specific configuration of the fixed attachment of the cantilevered tab 704 to the housing 13 may be as shown in fig. 12, where axial separation of the distal end cap 7 from the housing 13 is limited by positioning the cantilevered tab 704 of the distal end cap 7 within the catch 130 of the housing 13.
Please refer to fig. 13, which is a schematic diagram of the structure of the return spring 8.
The reset spring 8 is a thicker spring with an inner cavity, is convenient to sleeve outside the cylinder part 72 of the distal end cover 7 and the thin part 42 of the outer lock sleeve 4, and simultaneously, two ends of the reset spring 8 respectively prop against the end surfaces of the distal end cover 7 and the outer lock sleeve 4, and the reset spring 8 is compressed to store energy in an original state to generate extrusion force for the outer lock sleeve 4 and the distal end cover 7; after the outer lock sleeve 4 is triggered by the triggering force being extruded along the axial direction, the reset spring 8 can be further compressed for energy storage, and then after the triggering force is removed, the reset spring 8 can push the outer lock sleeve 4 to reset.
Fig. 14 is a schematic structural view of the feed spring 9.
The feed spring 9 is a spring with a thin inner cavity and has a longer length than the return spring 8. The feeding spring 9 is sleeved on the central rod 701 of the distal end cover 7 after being installed and is positioned in the inner cavity of the push rod 5, one end of the feeding spring 9 is propped against the part of the base 71 of the distal end cover 7 positioned around the central rod 701, the other end of the feeding spring is propped against the inner surface of the end face of the push rod 5, and the feeding spring 9 is compressed to store energy in an original state, so that the pushing of the push rod 5 is conveniently realized, and the automatic feeding function of the automatic injection device is realized.
Referring to fig. 15, a schematic diagram of the syringe 10 is shown.
The syringe 10 includes a barrel 10a, a needle cover 10b, and a needle (not visible in the view of fig. 15) in communication with the barrel 10a and within the needle cover 10 b. The needle cover 10b is provided with a plurality of square and strip-shaped through holes.
Referring to fig. 16, a schematic view of the proximal end cap 11 is shown.
The proximal end cap 11 is generally cylindrical in shape with a cavity therein and an end face at one end and an open end at the other.
As shown in fig. 16, the inner surface of the end face of the proximal end cap 11 is provided with two opposite protrusions 1101, and the two protrusions 1101 are used for being respectively buckled in corresponding grooves of the trigger sleeve 12, so as to ensure that the proximal end cap 11 and the trigger sleeve 12 are firmly nested.
Two snap-in buttons 1102 also extend from the inner surface of the end face in the inner cavity of the proximal end cap 11, and each snap-in button 1102 is used for correspondingly being buckled in a square through hole of the syringe 10, so as to realize fixation and connection between the proximal end cap 11 and the syringe 10.
Referring to fig. 17, a schematic structural view of the trigger sleeve 12 is shown.
The trigger sleeve 12 includes a hollow cylindrical body portion and two opposed trigger rods extending from one end of the hollow cylindrical body portion.
The inner surface near the end of the hollow cylinder portion has grooves 1202, the grooves 1202 are provided in two, and respectively matched and buckled with the two protrusions 1101 of the proximal end cap 11, so as to ensure that the proximal end cap 11 is firmly nested with the trigger sleeve 12.
A catch 1201 is provided in the middle of each trigger rod of the trigger sleeve 12, the catch 1201 being adapted to cooperate with a corresponding structure of the housing 13, preventing the trigger sleeve 12 from falling out after being mounted inside the housing 13.
Each trigger lever of the trigger sleeve 12 also has a trigger end 1203.
Please refer to fig. 18 and 19, which are a schematic perspective view and an internal structure of the housing 13.
The housing 13 is cylindrical in shape as a whole, and is open at both ends; two opposite clamping grooves 130 are provided near one end of the housing 13 for cooperating with cantilever protrusions 704 of the distal end cap 7 to fix the distal end cap 7 and the housing 13 to each other. The end portion is further provided with a slide groove 131 for cooperation with a guide projection 404 of the outer lock sleeve 4.
The housing 13 has two baffle features 1301 (as shown in fig. 19) disposed opposite each other for mating with the catch 1201 of the trigger sleeve 12. After the trigger sleeve 12 is mounted to the housing 13, the catch 1201 of the trigger sleeve 12 is restrained by the baffle features 1301 in the housing 13 and thus prevents the trigger sleeve 12 from falling out after being mounted inside the housing 13.
The housing 13 is also provided with two openings 1302 arranged oppositely near the other end opposite to the arrangement end of the card slot 130.
The following describes a method of mounting the automatic injection device of the present embodiment.
Referring to fig. 20, an axial cross-sectional view of the automatic injection device of the present embodiment in its original state is shown.
In fig. 20, the parts disposed at both ends of the automatic injection device are a proximal end cap 11 and a distal end cap 7, respectively, defining the location of the proximal end cap 11 as proximal and the location of the distal end cap 7 as distal. The proximal end is an execution end of the automatic injection device for receiving an external trigger force or triggering sounding, thereby releasing internal energy storage. The remote end is the operation end of the automatic injection device, the hand-held part is positioned on the outer surface of the remote end of the device, and main parts related to triggering, resetting, locking, energy storage and sounding feedback functions are arranged in the remote end position.
For the automatic injection device of the present embodiment, the feeding spring 9, the push rod 5, the toothed ring 2, the tooth slot 1, the reset lock sleeve 3, the inner lock sleeve 6, the outer lock sleeve 4, the reset spring 8 and the distal end cover 7 are jointly mounted to form a driving assembly a, the trigger sleeve 12, the proximal end cap 11 and the housing 13 are jointly mounted to form a housing assembly B, and the injector 10 is called an injector C, so that the automatic injection device is formed by combining 1 driving assembly a, 1 housing assembly B and 1 injector C.
Referring to fig. 21, the installation method of the driving assembly a is as follows:
the reset lock sleeve 3, the tooth socket 1 and the tooth ring 2 are sequentially arranged in the inner hole of the proximal end of the outer lock sleeve 4 from the proximal direction;
The push rod 5 and the inner lock sleeve 6 are arranged in the inner hole of the outer lock sleeve 4 from the far end;
then, the return spring 8 is nested on the outer surface of the detail 42 of the outer lock sleeve 4 from the distal end in sequence, and the feed spring 9 is nested in the inner hole of the push rod 5;
Finally, a distal end cap 7 is mounted distally.
As shown in fig. 21, when the distal end cover 7 is mounted in place, the surface protrusion 406 of the outer lock sleeve 4 is engaged with the slide groove 702 of the distal end cover 7, the end protrusion 602 of the inner lock sleeve 6 is engaged with the end groove 703 of the distal end cover 7, at this time, the return spring 8 is compressed between the outer lock sleeve 4 and the distal end cover 7, the feed spring 9 is compressed between the push rod 5 and the distal end cover 7, and under the tension of the return spring 8 and the feed spring 9, the end protrusion 602 of the inner lock sleeve 6 is engaged with the end groove 703 of the distal end cover 7, and the surface protrusion 406 of the outer lock sleeve 4 is engaged with the slide groove 702 of the distal end cover 7.
Specifically, one end of the return spring 8 abuts against the end of the thick portion 41 of the outer lock sleeve 4, and the other end is disposed in the space between the inner surface of the cantilever projection 704 of the distal end cover 7 and the cylindrical portion 72, as shown in fig. 24, and please refer to fig. 11 in combination.
Specifically, as shown in fig. 21, an annular space is formed between a section of the inner lock sleeve 6 near the distal end cover 7 and the wall of the cylindrical portion 72 of the distal end cover 7 (please refer to fig. 11), and when the outer lock sleeve 4 moves toward the distal end cover 7, the annular space provides a receiving space for a section of the end of the detail 42 of the outer lock sleeve 4 after the outer lock sleeve 4 moves, so as to cooperatively realize the sliding of the outer lock sleeve 4 in the distal end cover 7.
Specifically, the push rod 5 passes through the central hole formed by sleeving the outer lock sleeve 4, the reset lock sleeve 3, the tooth groove 1 and the tooth ring 2, and the proximal end of the push rod 5 is exposed out of the proximal end of the assembly formed by sleeving the outer lock sleeve 4, the reset lock sleeve 3, the tooth groove 1 and the tooth ring 2. In connection with fig. 20 and the description of the above components, it can be seen that the push rod 5 passes through the inner lock sleeve 6, the small caliber portion 32 of the reset lock sleeve 3, the inner hole 203 of the tooth ring 2, the end face hole 101 of the tooth slot 1 from the distal end to the proximal end, and the proximal end is exposed outside the outer lock sleeve 4.
In this way, in the original state, the drive assembly a has a self-locking function, and at the same time, the drive assembly a also has an energy storage function because the return spring 8 and the feed spring 9 are compressed in the drive assembly a locking function. This will have a beneficial effect on the implementation of functions such as subsequent triggering, resetting, sounding feedback, etc. of the automatic injection device.
Please refer to fig. 22, which is a cross-sectional view of the housing assembly B. Referring to fig. 22, a method of installing the housing assembly B of the automatic injection device is described as follows:
In fig. 22, trigger sleeve 12 is mounted in the proximal direction within the internal bore of housing 13, and after being mounted in place, snap fit 1201 of trigger sleeve 12 is restrained by baffle feature 1301 inside housing 13, preventing trigger sleeve 12 from falling out after being mounted inside housing 13.
The proximal end cap 11 is then mounted in a nested fashion on the outer surface of the trigger sleeve 12 in the proximal direction, and during mounting, the projection 1101 of the proximal end cap 11 will snap into the recess 1202 of the trigger sleeve 12, thus ensuring that the proximal end cap 11 is securely nested with the trigger sleeve 12.
Fig. 23 is a schematic sectional structure of the syringe C.
Fig. 24 is a cross-sectional view of the automatic injection device in its original state rotated 90 degrees about the axial direction with respect to fig. 20.
Referring to fig. 20 and 24 in combination, when the assembly of the drive assembly a and the housing assembly B is completed, the syringe C is loaded from the distal end of the housing 13, and then the drive assembly a is loaded from the distal end of the housing 13, and the cantilever protrusions 704 of the distal end cap 7 are engaged in the engaging grooves 130 of the housing 13, so that the installation of the drive assembly a on the housing assembly B is achieved, and thus the installation of the automatic injection device is also completed.
The triggering, resetting, locking, energy storage and sounding feedback functions of the automatic injection device are clearly embodied in the specific task completion process. Specific task processes include, but are not limited to, original state, trigger state, run state, end state. The automatic injection device accomplishes the intended tasks described above by way of a different combination of functions. The different functions of the automatic injection device are accompanied by a task completion process as detailed below.
When the automatic injection device is in the original state, the device has locking and energy storage functions, as shown in detail in fig. 20 and 24, wherein fig. 20 is an axial cross-section of the automatic injection device in the original state. Fig. 24 is a cross-sectional view of the automatic injection device rotated 90 degrees about the axial direction.
As shown in fig. 24, the automatic injection device of this embodiment is characterized at least in that the distal end cover 7, the outer lock sleeve 4, the inner lock sleeve 6 and the push rod 5 are axially sleeved, and two symmetrical through holes 503 are provided on the outer surface of the push rod 5 to respectively cooperate with two protruding features 601 provided inwards on the inner lock sleeve 6. In the locked and stored state (i.e. the original state) of the automatic injection device, the feed spring 9 has a tendency to drive the push rod 5 together to move proximally, whereas in the distal inner bore of the outer lock sleeve 4, the protruding feature 601 of the inner lock sleeve 6 is limited by the outer lock sleeve 4 and cannot expand circumferentially under the action of the feed spring 9, so that the through hole 503 of the push rod 5 is limited by the protruding feature 601, and thus the automatic injection device in the locked state is not triggered by errors due to environmental disturbances such as impact, vibration, etc., greatly enhancing the stability of the automatic injection device.
The automatic injection device of the present embodiment is also characterized in that the sounding feedback function provided in the automatic injection device is a sounding function, which is embodied in a specific operation state. When the automatic injection device is triggered, it enters an operational state, and the automatic injection device continuously emits a "click" sound. Specifically, in the component parts shown in fig. 20, the sounding feedback function is realized by the combined action of the tooth socket 1 and the toothed ring 2 arranged in the automatic injection device, and the sound effect of "clicking" is generated by the mechanical collision of the tooth-pulling part 2011 of the elastic arm 201 of the toothed ring 2 to the circumferential tooth socket 102 of the tooth socket 1. The specific sounding mechanism will be described in detail in the case of an automatic injection device operating state.
Through the sounding feedback function, the automatic injection device can make a sound outwards, and the function can be used as an interface function of man-machine interaction or in-machine interaction, so that the functional state of the automatic injection device can be monitored by a user or a sensor, and the user can conveniently carry out subsequent control or decision execution.
In the installed state shown in fig. 20, the tooth slot 1 is nested in the inner hole of the outer lock sleeve 4, and the tooth ring 2 is nested in the inner hole of the tooth slot 1. Fig. 25a and 25b show the specific mating relationship of the tooth slot 1 and the ring gear 2 and the push rod 5, with parts 3, 4, 6, 7, 8, 9, 10, 11, 12, 13 removed. The viewing angle of fig. 25a is from the proximal end to the distal end, and fig. 25b is from the distal end to the inside viewing angle of the proximal end. Specifically, the gear ring 2 and the push rod 5 are in clearance fit, specifically, the slider protrusion 202 of the gear ring 2 in fig. 25a is matched with the spiral track 502 of the push rod 5; the tooth socket 1 and the tooth ring 2 are in a clearance fit, in particular the elastic arms 201 of the tooth ring 2 in fig. 25b are in engagement with the tooth form of the circumferential tooth socket 102 of the tooth socket 1, and the tooth ring 2 is tensioned in the circumferential tooth socket 102 of the tooth socket 1 by the elastic arms 201.
Furthermore, in fig. 25a, the end face feature 501 of the push rod 5 is engaged with the end face hole 101 of the toothed ring 1, and it can be seen from fig. 20 that the push rod 5 protrudes out of the end face hole 101 of the toothed ring 1 and is directed proximally, the end face feature 501 of the push rod 5 being engaged with the hole axis of the end face hole 101 of the toothed ring 1 being non-circular. Such a cooperating form is advantageous in that the toothed ring 1 restricts the rotational movement of the push rod 5 through the end face hole 101, and in that the toothed ring 1 is fixed to the outer lock sleeve 4 so as not to rotate, thereby allowing the push rod 5 to perform only translational movement in the axial direction.
Fig. 26a is a front view of the pushrod 5 showing the end face feature 501 and spiral track 502 of the pushrod 5. It should be noted that the outer surface of the push rod 5 is provided with a spiral track 502, and the spiral track 502 is symmetrically arranged at 180 degrees on the outer surface of the push rod 5, as shown in fig. 26 b.
In the original state, the sounding feedback function is in a standby state and cannot be triggered.
By applying a trigger force to the internal components of the automatic injection device in its original state, the original state of the automatic injection device can be broken, thereby causing the automatic injection device to complete a series of sequential actions.
The trigger force is applied as shown in fig. 27, with the syringe 10 and proximal end cap 11 removed in fig. 27 for clarity of illustration of the trigger force transmission. When the trigger sleeve 12 is subjected to a pressing trigger force from the outside, the trigger end 1203 (see fig. 17 in combination) of the trigger sleeve 12 will bear against the trigger surface 401 of the outer lock sleeve 4, and then the trigger sleeve 12 and the outer lock sleeve 4 move together in the direction of the trigger force, thereby breaking the original state of the automatic injection device and entering the trigger state. When the device is in the activated state, the automatic injection device is subjected to an external trigger force or trigger sound from the view shown in fig. 27, and fig. 28 is a schematic view of the activated state of the automatic injection device.
In fig. 28, when the trigger surface 401 of the outer sleeve 4 is subjected to the trigger force F, the outer sleeve 4 moves distally and compresses the return spring 8 again. Under the continued action of the trigger force F, the return spring 8 is compressed, and the trigger sleeve 12 and the outer lock sleeve 4 move together distally in the direction of the trigger force, as shown in fig. 29.
During distal compression of the return spring 8 by the outer sleeve 4, the automatic injection device will break the locked and power storage state. As shown in fig. 30, the unlocking groove 405 of the outer lock sleeve 4 also moves axially along with the outer lock sleeve 4 distally, when moving to the position of fig. 30, the outer lock sleeve 4 releases the circumferential expansion limitation of the protruding feature 601 on the inner lock sleeve 6 in fig. 24 under the action of the unlocking groove 405, at this time, the power of the feeding spring 9 starts to be released proximally, the through hole 503 of the push rod 5 pushes the protruding feature 601 on the inner lock sleeve 6 circumferentially away under the action of the pushing force of the feeding spring 9, as shown in fig. 30, when the protruding feature 601 is pushed into the unlocking groove 405, the push rod 5 starts to move proximally and pushes the medicament to be injected into a human body through the needle of the injector 10, at this time, the trigger force F needs to be continuously maintained, the compression of the return spring 8 is continuously maintained until the feeding spring 9 is completely released, the push rod 5 is pushed to the final position, and the automatic injection device realizes the functions of feeding the push rod and injecting the medicament as shown in fig. 31.
During proximal translation of the push rod 5, the helical track 502 thereon is also exposed with the push rod 5 out of the drive assembly a, as shown in fig. 32.
In fig. 33a, the helical track 502 drives the slider protrusion 202 of the ring gear 2 in a rotational movement during proximal translation of the push rod 5, and when the ring gear 2 rotates in the tooth slot 1, the resilient arms 201 are elastically deformed, scraping the circumferential tooth slot 102 inside the tooth slot 1. As can be seen from fig. 33b, during the proximal movement of the push rod 5, the toothed ring 2 has been rotated around the axial direction by an angle with respect to the original position of fig. 33a, during which the resilient arms 201 make a sound by scraping the circumferential tooth grooves 102 of the tooth grooves 1, which is used to alert the person concerned that the automatic injection device is performing the feeding function.
At this time, the toothed ring 2, the tooth space 1, the reset lock sleeve 3 and the inner lock sleeve 6 mounted inside the outer lock sleeve 4 are mutually supported in the axial direction, as can be seen from fig. 21, the end protrusion 602 of the inner lock sleeve 6 is buckled with the end groove 703 of the distal end cap 7, as can be seen from fig. 30, the distal end cap 7 is buckled with the clamping groove 130 of the housing 13 through the cantilever protrusion 704, and the tooth space 1 is abutted against the end of the syringe 10, while the toothed ring 2 is disposed in the tooth space 1, and the tooth space 1 is abutted against the bottom surface of the proximal inner hole of the reset lock sleeve 3 at the distal end thereof due to the disposition of the proximal inner hole of the reset lock sleeve 3. Therefore, when the device is in the triggering state, the toothed ring 2, the tooth groove 1, the reset lock sleeve 3 and the inner lock sleeve 6 cannot axially displace along with the push rod 5.
When the automatic injection device is in an end state, it has reset, lock and audible feedback functions. It is noted that the reset and lock functions of an automatic injection device are sequential functions, which are the first to prepare for operation when the device is in an initial state and a trigger state, and then to spontaneously complete the final sequential functions in the end state of the device.
The reset and lock functions of the automatic injection device are mainly achieved by the outer lock sleeve 4 and the reset lock sleeve 3.
In the activated state, the activation force F acts on the reset ramp 302 of the reset sleeve 3 in addition to the activation surface 401 of the outer sleeve 4, as shown in fig. 34 a-34 e. The relative axial distance L between the trigger surface 401 and the reset inclined surface 302 can be freely set, as shown in fig. 34a, so that the trigger force F can axially displace the outer lock sleeve 4 distally, and then the reset lock sleeve 3 axially rotates, as shown in fig. 34 a-34 c. The circumferential position of the reset lockout 301 now changes significantly with respect to the initial position shown in fig. 34a and 34d as the reset sleeve 3 rotates, as shown in fig. 34e, which provides for the subsequent reset and lockout functions of the automatic injection device.
In order to more clearly describe the state of change of the parts inside the device during the resetting and locking, the shielding effect of the housing 13 and the proximal end cap 11 is removed in the following figures, and the specific timing of the resetting and locking will be described in detail by the following figures.
Fig. 35a, 36a, 37a are schematic views of an original state of the automatic injection device, fig. 35b, 36b, 37b are schematic views of a triggered state of the automatic injection device, and fig. 35c, 36c, 37c are schematic views of an end state of the automatic injection device.
In fig. 35a, the automatic injection device is maintained in an initial installed state in which the reset sleeve 3 is installed in the proximal inner bore of the outer sleeve 4, as shown in fig. 36 a. Also, it is evident from fig. 37a, in which the redundancy feature is removed, that in the initial installed state the reset stop 402 of the outer sleeve 4 is arranged closer to the proximal end than the reset lock 301 of the reset sleeve 3. At this time, the return spring 8 maintains an initial compressed state, and is not subjected to an external trigger force.
In fig. 35b, the automatic injection device is triggered by a triggering force F from the outside. When the outer sleeve 4 is subjected to an axially distally directed triggering force F, the outer sleeve 4 will distally compress the return spring 8. As can be seen from fig. 34c, the trigger force F acts on the reset sleeve 3 to rotate relative to the outer sleeve 4 in addition to the distal axial displacement of the outer sleeve 4. At this time, the reset lock 301 of the reset lock sleeve 3 is also rotationally changed with respect to fig. 36a, as shown in fig. 36 b. Also, as is evident from fig. 37b, in which the redundant feature is removed, in the triggered state, the reset lock 301 of the reset sleeve 3 is closer to the proximal direction than the reset stop 402 of the reset sleeve 4 due to the displacement of the outer sleeve 4 axially distally, at which time the reset spring 8 is compressed twice by the outer sleeve 4 under the triggering force F.
Fig. 35a, 35b, 36a, 36b, 37a, 37b clearly illustrate the preparation of the automatic injection device for the reset and lock functions.
In fig. 35c, the device is in an end state, where the automatic injection device has completed the feeding function. In the last step, since the return spring 8 is compressed by the outer sleeve 4, when the trigger force F is removed, the return spring 8 will release the secondarily compressed spring force F proximally to the outer sleeve 4, and the return spring 8 will push the outer sleeve 4 to axially displace proximally, as shown in fig. 35 c. Since in the previous step the reset lockout 301 of the reset lockout sleeve 3 is closer to the proximal direction than the reset stop 402 of the outer lockout sleeve 4, during proximal axial displacement of the outer lockout sleeve 4, the reset stop 402 will continue to bear against the ramped surface of the outer extension 3011 of the reset lockout 301, causing the reset lockout 301 to elastically deform and retract circumferentially inwardly until the reset spring 8 fully releases the spring force F, the reset lockout 301 falling into the empty slot within the reset stop 402, as shown in fig. 35c, 36 c. Compared to fig. 36b, it is evident in fig. 36c that a part of the reset lockout 301 is obscured by the reset stop 402, when the reset stop 402 of the outer sleeve 4 is closer to the proximal direction than the reset lockout 301 of the reset sleeve 3, as shown in fig. 37c with the redundant feature removed. The process of elastically deforming the reset lock 301 is shown in fig. 38a, 38b, and 38 c. Wherein fig. 38a corresponds to the device state of fig. 35b, fig. 38b is a change of the reset lock 301 in the device from fig. 35b to fig. 35c, and fig. 38c corresponds to the device state of fig. 35 c.
Comparing fig. 35c and 35a, it is clear that in the original state and the end state of the automatic injection device, the relative position of the outer lock sleeve 4 is not changed and the return spring 8 remains in the initial compressed state, so that the automatic injection device completes the return function.
In particular, in fig. 37c, when the outer lock sleeve 4 is again subjected to the distally-directed trigger force F from the outside, the reset lock 301 can abut against the reset stop 402, and further, the outer lock sleeve 4 cannot be moved distally again, so that the automatic injection device has a locking function as well as a reset function.
In particular, in fig. 37c, 38b and 38c, since the reset lock 301 is elastically deformed and contracted inward along the circumferential direction during the process of falling into the empty slot in the reset stop 402, and after falling into the empty slot in the reset stop 402, the reset lock 301 is elastically restored, so that the reset lock 301 collides with the wall of the proximal inner hole of the outer lock sleeve 4 under the action of the instantaneous elastic restoration of the reset lock 301, thereby generating sounding sound to prompt personnel that the automatic injection device has completed the reset and locking functions.
The automatic injection device completes the functions of energy storage, triggering, sounding feedback, resetting and locking according to time sequence along with the original state, the triggering state, the running state and the ending state.
The present invention generally provides an automatic injection device.
1. The whole set of scheme of the automatic injection device provides the technical principles of realizing the functions of energy storage, triggering, sounding feedback, resetting and locking.
2. The automatic injection device of the present invention provides a transmission arrangement and/or method incorporating the components involved in the triggering mechanism, the energy storage mechanism, the audible feedback mechanism, the reset mechanism, the locking mechanism.
3. The sounding feedback mechanism of the automatic injection device is that a thread track on a push rod is used for driving a toothed ring to rotate, so that the toothed ring scrapes tooth grooves to give out continuous or intermittent sound feedback, and the sounding feedback mechanism belongs to auditory feedback.
4. The inner lock sleeve of the automatic injection device is nested in the outer lock sleeve, and the outer lock sleeve can be triggered only by moving a long distance axially towards the far end, so that false triggering can be prevented before the automatic injection device is used.
5. In the driving assembly of the automatic injection device, a distal end cover, an outer lock sleeve, an inner lock sleeve and a push rod are axially sleeved, and two symmetrical through holes are arranged on the outer surface of the push rod and are respectively matched with two inward protruding features on the inner lock sleeve. In the original state of the automatic injection device, the feed spring has a tendency to drive the push rod to move together to the proximal end, and in the inner hole at the distal end of the outer lock sleeve, the protruding feature of the inner lock sleeve is limited by the outer lock sleeve and cannot be expanded circumferentially under the action of the feed spring, so that the through hole of the push rod is limited by the protruding feature, and the automatic injection device is not triggered by mistake due to environmental interference such as impact and vibration in the locked state, and the stability of the automatic injection device is greatly enhanced.
6. When the automatic injection device is reset, after the reset lock sleeve rotates around the axial direction, the reset lock sleeve and the outer lock sleeve can fall into the reset stop of the outer lock sleeve under the action of the reset spring, so that secondary reuse can be prevented after the automatic injection device is used.
7. The automatic injection device of the present invention is excellent in safety.
The automatic injection device of the present invention has the following advantages:
1. The automatic injection device is a modularized device with a pure mechanical structure, and therefore, the automatic injection device has the inherent properties of high reliability and good stability of the mechanical structure.
2. The invention integrates the functions of energy storage, triggering, sounding feedback, resetting and locking into an automatic injection device, and the technical scheme has various functional characteristics and perfect automation characteristics; according to the invention, through reasonable arrangement of the transmission structure and the scheme, the functions of releasing spring energy storage, pushing action, sounding feedback and resetting and locking after injection can be automatically completed by one-time triggering, so that the integration level of the device is greatly improved, and the complexity of the operation process is reduced; on the premise of high integration level of the automatic injection device, the automatic protection of the needle after use can be realized, and the safety requirement of the device is improved.
3. The sounding feedback function of the automatic injection device can be used as an interface of information interaction, and sound is sent to the outside through specific sound feedback and touch feedback, so that the functional state of the automatic injection device can be monitored by a user, and the user can conveniently carry out the next control or decision execution. The information transfer path during operation is from device to person and then from person to device. Therefore, the device has the attribute of a closed-loop system, and the safety and reliability of the device in the operation process can be greatly improved.
4. The automatic injection device of the invention can be used as a multifunctional automatic injection device and can be combined and applied to various injection occasions (such as specific subdivision fields of chronic disease treatment, emergency treatment, diagnosis and the like), and the clinical applicability of the technical scheme is very wide.
5. The automatic injection device provided by the invention has the functions of triggering, energy storage, sounding feedback, resetting and locking, can be reasonably assembled and adapted according to different using target groups (such as universities, scientific research institutions, enterprises, educational systems, medical systems and the like), can be manufactured by using metal materials or polymer materials, and can be used as a reusable or disposable automatic injection device.
The above embodiments are only preferred embodiments of the present invention, but should not be construed as limiting the scope of the present invention, and any modifications, equivalent arrangements, equivalent substitutions and improvements made within the spirit or the essence of the present invention are within the scope of the present invention. The scope of the invention should, therefore, be determined from the following claims.