CN113546243A - an infusion pump - Google Patents

Abstract

The embodiment of the application provides an infusion pump, which comprises a pump body and an infusion apparatus, wherein the infusion apparatus comprises an infusion box, the infusion box comprises a first component, a second component and a first elastic membrane, and a first groove is formed in one side, facing the first component, of the second component; the first elastic membrane is arranged between the first member and the second member; the first groove comprises a pump cavity, a first brake cavity and a second brake cavity; the pump cavity, the first brake cavity and the second brake cavity are linearly arranged; the pump body comprises a pump head frame, a cam shaft, a plunger assembly, a first brake valve post assembly, a second brake valve post assembly and a power unit, wherein the cam shaft, the plunger assembly, the first brake valve post assembly, the second brake valve post assembly and the power unit are rotatably arranged on the pump head frame, the cam shaft drives the plunger assembly, the first brake valve post assembly and the second brake valve post assembly to creep and extrude the first elastic diaphragm in sequence in the rotating process. The infusion pump is simple to assemble and small in assembly error; in addition, the first elastic diaphragm is less likely to undergo unexpected displacement and oscillation.

Description

Infusion pump

Technical Field

The application relates to the technical field of medical equipment, in particular to an infusion pump.

Background

In clinical practice, liquids often need to be infused into a patient in a very precise manner, in which case a gravity-based infusion device is often difficult to meet. Instead, the dosage and speed of the liquid are adjusted by the infusion pump to perform precise infusion. Therefore, in recent years, infusion pumps have become widely used, and various types of infusion pumps have come into the market, such as infusion pumps used for general infusion, portable analgesia infusion pumps used for analgesia, infusion pumps used for blood transfusion and chemotherapy, and the like.

In the related technology of the infusion pump, a pump body wriggles and presses a pipeline of the infusion set to control the flow of liquid in the infusion tube. Wherein, an infusion pump passes through wriggling piece and presses the flow of PVC material transfer line in order to control the transfusion system interior liquid according to the rigid extrusion of time sequence, under the condition of being extruded repeatedly by the wriggling piece, the risk that the PVC pipe often has the weeping that breaks, and the whole size of this type of infusion pump is great relatively, and weight is heavy.

In addition, another infusion pump is provided, wherein a flexible silicone tube arranged in an infusion box of the infusion apparatus is extruded by a peristaltic finger according to a time sequence so as to control the flow of liquid in the infusion apparatus, two ends of the flexible silicone tube are relatively fixed, and other parts between the two ends are approximately horizontally arranged along an extrusion plate and are in a relatively free state. Generally, when the peristaltic finger of the pump body wriggles, the silicone tube may be driven to randomly displace and swing, and the displacement and the swing have adverse effects on the infusion precision to a certain extent; meanwhile, when the silicone tube is assembled with the extrusion plate, the infusion precision can be changed due to the difference of the length of the silicone tube, the gap between the silicone tube and the extrusion plate and the like; moreover, the infusion pump puts high requirements on the fit clearance between the peristaltic fingers of the pump body and the fixed holes of the peristaltic finger frames, if the clearance is large, the peristaltic fingers can swing and cannot accurately extrude to the preset position of the silicone tube, and if the clearance is too small, the peristaltic fingers and the fixed holes of the peristaltic finger frames are easy to rub, so that the service life of the pump head is influenced, and the moment of the peristaltic fingers is reduced.

Disclosure of Invention

In view of the above, it is desirable to provide an infusion pump.

In order to achieve the above object, an embodiment of the present application provides an infusion pump, including a pump body and an infusion apparatus, where the infusion apparatus includes an infusion box and an infusion tube connected to the infusion box, the pump body and the infusion box are separably matched, a flow channel is provided in the infusion box, the infusion box includes a first member, a second member and a first elastic membrane, and a first groove is formed on one side of the second member facing the first member; the first elastic membrane is arranged between the first member and the second member to hermetically cover the first groove, and the first elastic membrane and the first groove jointly form at least one part of the flow passage; the first recess includes a pump chamber, a first brake chamber upstream of the pump chamber, and a second brake chamber downstream of the pump chamber; the pump cavity, the first brake cavity and the second brake cavity are linearly arranged; the pump body sets up in the one side that first component deviates from the second component, the pump body includes the pump headstock, set up in with rotating camshaft on the pump headstock, with pump chamber extrusion fit's plunger subassembly, with first brake valve post subassembly of first brake chamber extrusion fit, with second brake valve post subassembly of second brake chamber extrusion fit, and drive the power unit that the camshaft rotates, the tip of plunger subassembly, first brake valve post subassembly and second brake valve post subassembly all with the surface of rotation slip butt of camshaft, the camshaft drives in the rotation process the plunger subassembly, first brake valve post subassembly, second brake valve post subassembly wriggle in proper order and extrude first elastic diaphragm so that the liquid in the runner produces directional flow.

In some embodiments, the manner in which the first and second brake valve post assemblies compress the first resilient diaphragm is a full compression; the mode that the plunger subassembly extrudeed first elastic diaphragm is half extrusion.

In some embodiments, the end face of the plunger assembly for pressing the first elastic membrane is an arc surface, and the shape of the pump cavity is matched with the shape of the end face of the plunger assembly; and/or the end surface of the first brake valve post assembly, which is used for extruding the first elastic diaphragm, is an arc surface, and the shape of the first brake cavity is matched with that of the end surface of the first brake valve post assembly; and/or the end face of the second brake valve post assembly, which is used for extruding the first elastic diaphragm, is an arc surface, and the shape of the second brake cavity is matched with that of the end face of the second brake valve post assembly.

In some embodiments, a first end of the infusion box along the length direction is provided with a liquid inlet, a second end of the infusion box along the length direction is provided with a liquid outlet, and the flow channel, the liquid inlet and the liquid outlet are arranged in a straight line in a projection in a plane perpendicular to the thickness direction of the infusion box.

In some embodiments, the power unit includes a motor and a transmission mechanism coupled between a shaft of the motor and a camshaft.

In some embodiments, the infusion cassette further comprises a third member, a second elastic membrane, and a locking mechanism, wherein a side of the second member facing away from the first member is formed with a second groove; the second groove is communicated with the first groove and is positioned at the downstream of the first groove; the second elastic membrane is disposed between the second member and the third member to sealingly cover the second groove; the locking mechanism comprises an installation frame and a liquid stopping plug fixedly arranged on the installation frame, the liquid stopping plug can extrude the second elastic membrane to close the flow channel, and the locking mechanism can be switched between a closed state of closing the flow channel or an open state of opening the flow channel.

In some embodiments, the open state comprises a first open state; when the infusion cassette is combined with the pump body, the pump head frame of the pump body forces the mounting frame to move towards the third component direction so as to drive the locking mechanism to switch from the closed state to the first open state and keep the locking mechanism in the first open state.

In some embodiments, the infusion cassette comprises a resilient member that exerts a force on the mounting frame to enable the latching mechanism to remain in a closed state closing the flow passage.

In some embodiments, the resilient member drives the latch mechanism to switch from the first open state to the closed state and remain in the closed state when the infusate cassette is detached from the pump body.

In some embodiments, the open state comprises a second open state, and the locking mechanism comprises a latch structure disposed on the mounting bracket; at least one of the first member, the second member, and the third member is in locking engagement with the latch structure such that the locking mechanism can enter and remain in the second open state.

In some embodiments, a portion of the structure of the mounting bracket protrudes from a side of the first member facing the pump body; a convex column used for pushing the mounting frame is formed on one side, facing the infusion box, of the pump head frame, and an inclined surface is formed at the end, facing one end of the infusion box, of the convex column; during the combination of the infusion cassette and the pump body, the inclined surface pushes the mounting frame to move towards the direction of the third member to fix the locking mechanism at the position of the first open state.

In some embodiments, the first groove includes two pressure monitoring chambers, one of the pressure monitoring chambers being disposed upstream of the first brake chamber, the other of the pressure monitoring chambers being disposed downstream of the second brake chamber, the pump body includes two pressure monitoring devices disposed on the head frame, one of the pressure monitoring devices being disposed on a side of the first brake valve post assembly facing away from the plunger assembly, the other pressure monitoring device being disposed on a side of the second brake valve post assembly facing away from the plunger assembly, the first brake valve post assembly, the second brake valve post assembly, and the two pressure monitoring devices being arranged in a straight line.

In some embodiments, the pressure monitoring chamber located downstream of the second brake chamber is disposed at an end of the first groove in a fluid flow direction.

In some embodiments, the camshaft is capable of forward and reverse rotation, and when the camshaft is in forward rotation, the camshaft drives the plunger assembly, the first brake valve post assembly, and the second brake valve post assembly to creep in a forward timing to drive the liquid in the flow passage to flow in a forward direction; when the camshaft rotates reversely, the camshaft drives the plunger assembly, the first brake valve post assembly and the second brake valve post assembly to creep according to reverse timing sequence so as to drive liquid in the flow channel to flow reversely.

According to the infusion pump, the first member and the second member belong to rigid injection molding parts, the first elastic membrane belongs to flexible injection molding parts, and the injection molding parts are high in production and processing precision, simple to assemble, small in assembly error and good in product consistency; in addition, the first elastic diaphragm is arranged between the first member and the second member, and when the first elastic diaphragm is pressed by the plunger assembly, the first brake valve post assembly and the second brake valve post assembly, the first elastic diaphragm has very small possibility of unexpected displacement and swing. In addition, in the embodiment of the application, the plunger assembly, the first brake valve post assembly and the second brake valve post assembly are driven by the same camshaft, so that on one hand, the driving structure can be simplified, and the product is compact in structure and portable; on the other hand, only one power unit is needed to drive the cam shaft to rotate, so that the cost can be reduced, and the control can be facilitated.

Drawings

Fig. 1 is a schematic structural diagram of an infusion pump according to an embodiment of the present application, in which a part of the structure is shown in a cross section.

FIG. 2 is a schematic view of the infusion pump of FIG. 1 in another state in which the pump body and the infusion cassette are separated;

FIG. 3 is a schematic view of a partial structure of an infusion set according to an embodiment of the present application;

FIG. 4 is an exploded view of the infusion cassette of FIG. 3;

FIG. 5 is a cross-sectional view of the structure shown in FIG. 3;

FIG. 6 is a schematic structural view of the second member shown in FIG. 5;

fig. 7 is a schematic structural view of the locking mechanism shown in fig. 5.

Description of the reference numerals

A transfusion box 1; afirst member 11; asecond member 12; athird member 13; a firstelastic diaphragm 14; a secondelastic diaphragm 15; astopper portion 110; afirst hole 11 a; asecond hole 11 b; athird hole 11 c; afourth hole 11 d; afirst groove 121; asecond groove 122; anoverflow aperture 122 a; thepump chamber 121 a; thefirst brake chamber 121 b; asecond brake chamber 121 c; thepressure monitoring chamber 121 d; a flow channel 1 a; aliquid inlet 1 b; aliquid outlet 1 c; a throughhole 1 d; a chute 1 f; arelief hole 13 a; alock mechanism 16; amounting frame 161; a connectingrod 1611; across-bar 1612; aslide bar 1613; astep surface 1613 a; alatch structure 1614; aliquid stop plug 162; aconnection hole 1612 a; anelastic member 17; a pump body 2; aplunger assembly 21; a firstbrake cylinder assembly 22; a secondbrake cylinder assembly 23; acamshaft 24; apower unit 25; amotor 251; atransmission mechanism 252; apressure monitoring device 26; an ultrasonicbubble monitoring device 27; apump head frame 28; aboss 281; theinclined surface 281 a;transfusion tube 3

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

In the description of the embodiments of the present application, the "thickness direction", "length direction" orientation or positional relationship is based on the orientation or positional relationship shown in fig. 5, it is to be understood that these orientation terms are merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present application.

The embodiment of the present application provides an infusion pump, please refer to fig. 1 and 2, the infusion pump includes a pump body 2 and an infusion apparatus, the infusion apparatus includes an infusion box 1 and aninfusion tube 3 connected to the infusion box 1. It is understood that the infusion set may further include other accessories, and the specific type of the accessory may be determined according to the actual use condition, and will not be described herein again.

The pump body 2 and the infusion box 1 are detachably matched. Specifically, when the infusion pump needs to be used, please refer to fig. 1, the pump body 2 and the infusion cassette 1 are engaged with each other. When the use is finished, please refer to fig. 2, the pump body 2 and the infusion cassette 1 can be separated from each other. The transfusion box 1 belongs to disposable consumables, and the pump body 2 is a reusable transfusion instrument.

In one embodiment, referring to fig. 5, the transfusion cassette 1 has aliquid inlet 1b, aliquid outlet 1c, and a flow channel 1a communicating with theliquid inlet 1b and theliquid outlet 1 c. One end of oneinfusion tube 3 is connected with theliquid inlet 1b, and one end of theother infusion tube 3 is connected with theliquid outlet 1 c. Referring to fig. 4, the infusion cassette 1 includes afirst member 11, asecond member 12 and a firstelastic membrane 14. Thefirst member 11 and thesecond member 12 are arranged in a stack. Thesecond member 12 is formed with afirst groove 121 towards a first side of thefirst member 11, in particular, a partial structure of thesecond member 12 is recessed, i.e. thefirst groove 121 is formed, and thefirst groove 121 is open towards thefirst member 11.

Referring to fig. 5, the firstelastic membrane 14 is disposed between thefirst member 11 and thesecond member 12 to seal and cover thefirst groove 121, so that the liquid can flow along the length extending direction of thefirst groove 121 without leaking, and the firstelastic membrane 14 and thefirst groove 121 cooperate to form a portion 1 a' of the flow channel 1 a. Referring to fig. 5, thefirst recess 121 includes apump chamber 121a, afirst stopper chamber 121b located upstream of thepump chamber 121a, and asecond stopper chamber 121c located downstream of thepump chamber 121 a. In a plane projection perpendicular to the thickness direction of the infusion cassette 1, thepump chamber 121a, thefirst brake chamber 121b and thesecond brake chamber 121c are linearly arranged.

The firstelastic membrane 14 is required to meet the biocompatibility requirements specified by the relevant standards and to have a desired elasticity and resistance to extrusion, such as silicone rubber.

The pump body 2 is disposed on a side of thefirst member 11 facing away from thesecond member 12. Referring to fig. 1, the pump body 2 includes apump head frame 28, acamshaft 24 rotatably disposed on thepump head frame 28, aplunger assembly 21 press-fitted to thepump chamber 121a, a first brakevalve cylinder assembly 22 press-fitted to thefirst brake chamber 121b, a second brakevalve cylinder assembly 23 press-fitted to thesecond brake chamber 121c, and apower unit 25 for driving thecamshaft 24 to rotate.

The ends of theplunger assembly 21, the first brakevalve post assembly 22 and the second brakevalve post assembly 23 are all in sliding contact with a rotating surface of thecamshaft 24, and thecamshaft 24 drives theplunger assembly 21, the first brakevalve post assembly 22 and the second brakevalve post assembly 23 to creep and press the firstelastic membrane 14 in sequence during rotation so as to enable the liquid in the flow passage 1a to generate directional flow.

The sequence of sequential squeezing of theplunger assembly 21, the first brakevalve cylinder assembly 22 and the second brakevalve cylinder assembly 23 is as follows:

stage S1: when the first brakevalve cylinder assembly 22 abuts the firstelastic diaphragm 14 against the wall surface of thefirst brake chamber 121b, the flow of the liquid in thefirst brake chamber 121b is intercepted, the second brakevalve cylinder assembly 23 is opened, theplunger assembly 21 presses the firstelastic diaphragm 14 in thecorresponding pump chamber 121a, the space in thepump chamber 121a is compressed, and the liquid in thepump chamber 121a flows downstream. That is, when theplunger assembly 21 is pressed, the secondbrake spool assembly 23 located downstream is in an open state.

Stage S2: the second brakevalve column assembly 23 abuts the firstelastic diaphragm 14 to the wall surface of thesecond brake chamber 121c, and cuts off the liquid flow at thesecond brake chamber 121 c; when the second brakevalve cylinder assembly 23 is opened and theplunger assembly 21 is opened, accordingly, the area of the first elastic diaphragm 14d corresponding to thepump chamber 121a is rebounded to the non-compressed state, so that thepump chamber 121a generates negative pressure, and the upstream liquid enters thepump chamber 121a to fill the space in thepump chamber 121 a.

The above-mentioned S1 stage and S2 stage are cyclically reciprocated, so as to realize the directional flow of the liquid in the flow passage 1 a.

In the infusion pump of the embodiment of the application, thefirst member 11 and thesecond member 12 belong to rigid injection molding parts, the firstelastic membrane 14 belongs to flexible injection molding parts, and the injection molding parts are high in production and processing precision, simple to assemble, small in assembly error and good in product consistency; in addition, the firstelastic diaphragm 14 is disposed between thefirst member 11 and thesecond member 12, and when the firstelastic diaphragm 14 is pressed by theplunger assembly 21, the firstbrake cylinder assembly 22, and the secondbrake cylinder assembly 23, the firstelastic diaphragm 14 is less likely to displace unexpectedly and swing. In addition, in the embodiment of the application, theplunger assembly 21, the first brakevalve cylinder assembly 22 and the second brakevalve cylinder assembly 23 are driven by thesame camshaft 24, so that on one hand, the driving structure can be simplified, and the product is compact in structure and portable; on the other hand, only one power unit is needed to drive thecam shaft 24 to rotate, so that the cost can be reduced, and the control can be facilitated.

In the related technology, all the peristaltic sheets can fully and rigidly extrude the flexible infusion tube to open or close the inner cavity of the pipeline, if the extruded part is a flexible PVC tube, the extruded part can be damaged and leak liquid when the infusion pump works for a long time; in addition, the flexible infusion tube can be subjected to necrosis of a large number of blood cells by adopting a mode that the peristaltic sheet fully and firmly extrudes the flexible infusion tube, and the flexible infusion tube is only suitable for common infusion and is not suitable for blood transfusion.

Therefore, in the embodiment of the present application, the manner in which the first and second brakevalve cylinder assemblies 22 and 23 compress the firstelastic diaphragm 14 is full compression; the manner in which theplunger assembly 21 compresses the firstresilient diaphragm 14 is semi-compression.

It should be noted that, taking the first brakevalve cylinder assembly 22 as an example, the full compression refers to that the end of the first brakevalve cylinder assembly 22 abuts the firstelastic diaphragm 14 to the wall surface of thefirst brake cavity 121b, so as to block the liquid flow at the first brake cavity.

The half-pressing means that the end of theplunger assembly 21 does not abut the firstelastic membrane 14 against the wall surface of thepump chamber 121a, so that there is a certain gap between the firstelastic membrane 14 and the wall surface of thepump chamber 121a, and the specific size of the gap is not limited, and the gap enables liquid to flow between the firstelastic membrane 14 and the wall surface of the pump chamber 12a, that is, theplunger assembly 21 does not intercept the flow of liquid at thepump chamber 121 a.

It should be noted that the main function of the firstbrake cylinder assembly 22 and the secondbrake cylinder assembly 23 is to shut off flow, and therefore, the area of the end portions thereof for contact with the firstelastic diaphragm 14 can be made small, and when it presses the firstelastic diaphragm 14, the pressing influence on the liquid in the flow passage is small.

In this embodiment, since the manner of pressing the firstelastic membrane 14 by theplunger assembly 21 is half pressing, and when theplunger assembly 21 presses the firstelastic membrane 14, the downstream secondbrake valve assembly 23 is in the open state, theplunger assembly 21 has little risk of blood cell damage in blood, and the risk of blood cell damage is within a clinically acceptable range in medicine, the infusion pump of the embodiment of the present application can be used for blood transfusion and other conventional infusion, analgesia, chemotherapy, and other scenes.

In one embodiment, the end surface of theplunger assembly 21 for pressing the firstelastic diaphragm 14 is a circular arc surface, and the shape of thepump cavity 121a is matched with the shape of the end surface of theplunger assembly 21. The end of theplunger assembly 21 and thepump chamber 121a are able to adapt during compression, thereby reducing the gap machining requirements of the mounting holes in thehead frame 28 for receiving theplunger assembly 21. In addition, the firstelastic diaphragm 14 itself has excellent resistance to squeezing, and the end face of theplunger 21 is a circular arc face, so that the risk of breakage and leakage due to repeated squeezing is very low.

In one embodiment, the end surface of the first brakevalve post assembly 22 for extruding the firstelastic diaphragm 14 is an arc surface, and the shape of thefirst brake cavity 121b is matched with the shape of the end surface of the first brakevalve post assembly 22. During compression, the end of the firstbrake cylinder assembly 22 is self-adaptive to thefirst brake chamber 121b, thereby reducing the clearance machining requirements of the mounting hole in thehead frame 28 for receiving the firstbrake cylinder assembly 22. Also, the firstelastic diaphragm 14 itself has good extrusion resistance, and the end face of the firstbrake cylinder assembly 22 is a circular arc surface, so that the risk of damage and leakage of fluid caused by repeated extrusion is very low.

In one embodiment, the end surface of the second brakevalve post assembly 23 for extruding the firstelastic diaphragm 14 is an arc surface, and the shape of thesecond brake cavity 121c is matched with the shape of the end surface of the second brakevalve post assembly 23. During compression, the end of the secondbrake cylinder assembly 23 and thesecond brake chamber 121c are adaptive, thereby reducing the gap machining requirement of the mounting hole in thehead frame 28 for accommodating the secondbrake cylinder assembly 23. Similarly, the firstelastic diaphragm 14 itself has good extrusion resistance, and the end face of the second brakevalve post assembly 23 is a circular arc surface, so that the risk of damage and leakage is very low when the first elastic diaphragm is repeatedly extruded.

It should be noted that theplunger assembly 21 may be a single cylinder, or may be a structure in which a plurality of cylinders are combined together. Similarly, the firstbrake cylinder assembly 22 may be a single cylinder or a combination of multiple cylinders. The secondbrake cylinder assembly 23 may be a single cylinder or a combination of a plurality of cylinders. The embodiment of the present application does not limit this.

In one embodiment, thecamshaft 21 can rotate in the forward and reverse directions, and when thecamshaft 21 rotates in the forward direction, thecamshaft 21 drives theplunger assembly 21, the first brakevalve cylinder assembly 22, and the second brakevalve cylinder assembly 23 to creep in the forward direction according to the forward timing sequence to drive the liquid in the flow passage to flow in the forward direction, i.e., the above-mentioned S1 and S2 are performed in a cycle. When the fluid is flowing in the forward direction, the fluid enters the patient. When thecamshaft 21 rotates reversely, thecamshaft 21 drives theplunger assembly 21, the first brakevalve cylinder assembly 22 and the second brakevalve cylinder assembly 23 to creep in reverse timing to drive the liquid in the flow passage to flow in reverse direction. When liquid is blocked in the conveying process, thecam shaft 21 can be controlled to rotate reversely accurately, the liquid is pumped back by the liquid conveying pump, blocking pressure is released, and the risk of injury to a patient caused by the blocking pressure is greatly reduced.

In one embodiment, referring to fig. 6, afirst hole 11a corresponding to thepump chamber 121a, asecond hole 11b corresponding to thefirst brake chamber 121b, and athird hole 11c corresponding to thesecond brake chamber 121c are formed in thefirst member 11, theplunger assembly 21 may extrude the firstelastic diaphragm 14 through thefirst hole 11a, the first brakevalve post assembly 22 may extrude the firstelastic diaphragm 14 through thesecond hole 11b, and the second brakevalve post assembly 23 may extrude the secondelastic diaphragm 15 through thethird hole 11 c.

In one embodiment, referring to fig. 5, theliquid inlet 1b is disposed at a first end of the infusion cassette 1 along the length direction, theliquid outlet 1c is disposed at a second end of the infusion cassette 1 along the length direction, and the flow channel 1a, theliquid inlet 1b and theliquid outlet 1c are linearly arranged in a projection in a plane perpendicular to the thickness direction of the infusion cassette 1. Therefore, the infusion box 1 is approximately long and is convenient for the pump body 2 to arrange a corresponding structure. It is understood that in other embodiments, the flow channel 1a, theliquid inlet 1b and theliquid outlet 1c may not be arranged in a straight line.

In an embodiment, referring to fig. 5 and fig. 6, thefirst groove 121 includes twopressure monitoring cavities 121d, one of thepressure monitoring cavities 121d is disposed upstream of thefirst braking cavity 121b, the otherpressure monitoring cavity 121d is disposed downstream of thesecond braking cavity 121c, thefirst member 11 is disposed with twofourth holes 11d corresponding to the twopressure monitoring cavities 121d, and thepressure monitoring device 26 abuts against a side of the firstelastic diaphragm 14 away from thepressure monitoring cavity 121d through thefourth holes 11 d.

Referring to fig. 1 and fig. 2, the pump body 2 includes twopressure monitoring devices 26 disposed on thehead frame 28, one of thepressure monitoring devices 26 is disposed on a side of the first brakevalve post assembly 22 away from theplunger assembly 21, the otherpressure monitoring device 26 is disposed on a side of the second brakevalve post assembly 23 away from theplunger assembly 21, and theplunger assembly 21, the first brakevalve post assembly 22, the second brakevalve post assembly 23, and the twopressure monitoring devices 26 are linearly arranged. Since thepressure monitoring device 26 abuts on the side of the firstelastic diaphragm 14 opposite to thepressure monitoring cavity 121d, thepressure monitoring device 26 can monitor the pressure value of the liquid in the flow channel 1a according to the reaction force of the firstelastic diaphragm 14 to the pressure monitoring device. Thereby judging whether the pressure is abnormal, blocked or empty, etc. In the embodiment of the present application, the twopressure monitoring devices 26 and thepressure monitoring cavity 121d are provided to improve the reliability of pressure monitoring, and reduce the possibility of erroneous judgment of the blockage of the infusion line as much as possible.

It should be noted that there may be only one of thepressure monitoring device 26 and thepressure monitoring cavity 121 d.

In other embodiments, the twopressure monitoring devices 26 may not be arranged in a straight line with theplunger assembly 21, thefirst brake assembly 22 and thesecond brake assembly 23, except that theplunger assembly 21, thefirst brake assembly 22 and thesecond brake assembly 23 are arranged in a straight line.

In one embodiment, referring to fig. 5, thepressure monitoring chamber 121d located downstream of thesecond braking chamber 121c is disposed at the end of thefirst groove 121 along the liquid flowing direction, that is, at the junction of thefirst groove 121 and thesecond groove 122, so that the structure can be more compact.

In one embodiment, the pump body 2 further comprises an ultrasonicbubble monitoring device 27 to monitor whether bubbles are present in the liquid in the flow channel 1 a. The number of the ultrasonicbubble monitoring devices 27 may be one or more, and is not limited herein. In the present embodiment, an ultrasonicbubble monitoring device 27 is provided between the secondbrake cylinder assembly 23 and thepressure monitoring device 26.

The specific structural form of thepower unit 25 is not limited, and in one embodiment, referring to fig. 2, thepower unit 25 includes amotor 251 and atransmission mechanism 252, and thetransmission mechanism 252 is connected between a rotating shaft of themotor 251 and thecam shaft 24. Thedrive mechanism 252 may be a chain, belt, or a set of drive-engaging gears. In the embodiment of the present application, thetransmission mechanism 252 is a gear set, and the gear set includes at least two gears, one of the gears is disposed coaxially with thecamshaft 24, and the other gear is disposed coaxially with the rotating shaft, and the two gears may be in direct engagement transmission or in indirect transmission through other intermediate gears.

Thetransmission mechanism 252 may be a one-stage transmission, a multi-stage transmission, etc., and is not limited herein.

In one embodiment, referring to fig. 4 and 5, the infusion cassette 1 further comprises athird member 13, a secondelastic membrane 15 and alocking mechanism 16. Asecond groove 122 is arranged on a second side, away from thefirst member 11, of thesecond member 12, a part of the structure of thesecond member 12 is recessed to form thesecond groove 122, thesecond groove 122 is opened towards thethird member 13, that is, thefirst groove 121 and thesecond groove 122 are positioned on the front and back sides of thesecond member 12; thesecond groove 122 communicates with thefirst groove 121 and is located downstream of thefirst groove 121.

With reference to fig. 5, the secondelastic membrane 15 is disposed between thesecond member 12 and thethird member 13 to cover thesecond recess 122 in a sealing manner, and the secondelastic membrane 15 and thesecond recess 122 cooperate to form another portion 1a ″ of the flow channel 1 a. That is, the flow channel 1a passes through the first side of thefirst member 11 to the second side of thefirst member 11, and the liquid flows from the first side of thesecond member 12 to the second side of thesecond member 12. Thelocking mechanism 16 includes a mountingframe 161 and a liquid stop plug 162 fixedly disposed on the mountingframe 161, that is, the mountingframe 161 and the liquid stop plug 162 move synchronously, and the liquid stop plug 162 can press the secondelastic diaphragm 15 to close the flow channel 1 a. Specifically, thethird member 13 is formed with anavoidance hole 13a, the liquid stop plug 162 can press the secondelastic membrane 15 through theavoidance hole 13a to close the flow channel 1a, theliquid stop plug 162 penetrates theavoidance hole 13a from the side of thethird member 13 away from thesecond member 12, and abuts the secondelastic membrane 15 in thesecond groove 122 of thesecond member 12 or on the peripheral wall of theoverflowing hole 122a at the end of thesecond groove 122, the secondelastic membrane 15 blocks the other part 1a ″ of the flow channel 1a, and the liquid cannot flow in the other part 1a ″ of the flow channel 1a, that is, the whole flow channel 1a is closed. That is, thelocking mechanism 16 achieves the closing or opening of the flow path 1a ″ by theliquid stop plug 162.

The firstelastic membrane 14 is made of a material, such as silicone, that meets the biocompatibility requirements specified by the relevant standards and has good extrusion resistance and expected elasticity. The material of the firstelastic membrane 14 and the material of the secondelastic membrane 15 may be the same or different, and are not limited herein.

The mountingframe 161 is movably connected to each of thefirst member 11, thesecond member 12, and thethird member 13 so that thelock mechanism 16 can switch between a closed state of closing the flow path 1a or an open state of opening the flow path 1 a.

It should be noted that thelocking mechanism 16 achieves the function of closing or opening the flow passage 1a through theliquid stop plug 162, and the movement of the mountingframe 161 relative to thefirst member 11, thesecond member 12 and thethird member 13 can change the degree of the liquid stop plug 162 pressing the secondelastic membrane 15.

In the infusion cassette 1 of the embodiment of the present application, theliquid stop plug 162 is disposed on the side of thethird member 13 away from thesecond member 12, so that thelocking mechanism 16 and the secondbrake cylinder assembly 23 can be prevented from interfering with each other. Specifically, it is assumed that theliquid stopper 162 is provided on the side of thefirst member 11 facing the pump body 2, or the lockingstructure 16 is provided in close proximity to the second brake cylinder assembly for the sake of compactness, but they are too close and interfere with each other; or the distance between the two is increased appropriately to avoid interference, so that the lengths of the infusion cassette 1 and the pump body 2 must be increased, which results in an increase in the size of the infusion pump. The size of a common infusion pump used for infusion in a fixed place is slightly larger, so that the influence on the use convenience is relatively small, but the size of the common infusion pump used as a portable analgesia pump is as compact as possible.

Moreover, the structural form of the secondelastic membrane 15 and thethird member 13 is easy to manufacture and assemble, and can also make the structure more compact; like the firstelastic diaphragm 14, during extrusion, the secondelastic diaphragm 15 will not have unexpected displacement, the end of theliquid stop plug 162 is set to be an arc surface, and the shape of the corresponding position of thesecond groove 122 in press fit with theliquid stop plug 162 is matched with the end surface of the liquid stop plug, so that the liquid stop effect is good, and the manufacturing error of the liquid stop plug 162 can be relaxed.

In one embodiment, a portion of the structure of the mountingframe 161 protrudes from the side of the first member facing the pump body 2. That is, the mountingframe 161 penetrates thefirst member 11, thesecond member 12, and thethird member 13, a part of the structure of the mountingframe 161 is located on a side of thethird member 13 facing away from thesecond member 12, and a part of the structure of the mountingframe 161 is located on a side of thefirst member 11 facing the pump body 2.

The open state comprises a first open state, and during the assembly of the infusion cassette 1 and the pump body 2, thepump head frame 28 of the pump body 2 forces the mountingframe 161 to move towards thethird member 13 to drive thelocking mechanism 16 to switch from the closed state to the first open state and keep the locking mechanism in the first open state. That is, when the feeding cassette 1 and the pump body 2 are combined, thepump head frame 28 of the pump body 2 can ensure that thelocking mechanism 16 is in the first open state. In one embodiment, referring to fig. 4, thelocking mechanism 16 further includes anelastic member 17, and theelastic member 17 applies a force to the mountingframe 161 to keep thelocking mechanism 16 in a closed state for closing the flow passage 1 a.

When the infusion cassette 1 is separated from the pump body 2, theelastic member 17 drives thelocking mechanism 16 to switch from the first open state to the closed state and to maintain the closed state. That is, when the infusion cassette 1 and the pump body 2 are separated, the default position of thelocking mechanism 16 is in the closed state, and thelocking mechanism 16 is relatively stably in the closed state under the action of theelastic member 17, so that the liquid in the infusion cassette can be prevented from flowing automatically, for example, in some application scenarios, if the liquid medicine flows automatically unexpectedly, environmental hazards may be caused, or patients or medical staff may be injured. When the infusion cassette 1 is assembled with the pump body 2, the default state of the infusion cassette 1 is the state of opening the flow channel 1a, i.e. thelocking mechanism 16 is in the open state, and the liquid in the flow channel 1a is automatically transferred to be controlled by theplunger assembly 21, the first brakevalve post assembly 22 and the second brakevalve post assembly 23 of the pump body 2.

The specific type of theelastic member 17 is not limited, and may be, for example, a tension spring, a compression spring, a torsion spring, or other elastic member. In the embodiment of the present application, theelastic member 17 is a torsion spring.

In one embodiment, the open state further comprises a second open state. Referring to fig. 7, thelocking mechanism 16 includes alatch structure 1614 disposed on the mountingframe 161, and at least one of thefirst member 11, thesecond member 12 and thethird member 13 can be locked and engaged with thelatch structure 1614 to lock thelocking mechanism 16 in the second open state. In both the first open state and the second open state, the flow path 1a is open, and the liquid can continuously flow through the flow path 1 a. For example, the second open state is often used to vent air from the infusion set prior to infusion.

When the pump body 2 is separated from the infusion cassette 1, thelatch mechanism 1614 can be latched when thelatch mechanism 16 needs to be maintained in the open flow path 1a, and at this time, thelatch mechanism 16 is locked in the second open state.

In one embodiment, referring to fig. 4, the infusion cassette 1 has two throughholes 1d penetrating through the infusion cassette 1 in the thickness direction, and the flow channel 1a is located between the two throughholes 1 d. Referring to fig. 7, the mountingframe 161 includes across bar 1612, a connectingrod 1611 and a slidingrod 1613, one slidingrod 1613 is disposed in each throughhole 1d, the connectingrod 1611 is disposed on one side of thefirst member 11 facing the pump body 2, thecross bar 1612 is disposed on one side of thethird member 13 facing away from thesecond member 12, first ends of the two slidingrods 1613 are connected to the connectingrod 1611, second ends of the two slidingrods 1613 are connected to thecross bar 1612, and theliquid stop plug 162 is disposed on thecross bar 1612.

In the process of combining the pump body 2 and the infusion box 1, the pump body 2 pushes the connectingrod 1611 to move towards thethird member 13, the connectingrod 1611 drives thewhole locking mechanism 16 to move synchronously, and in the process of moving, theliquid stop plug 162 is gradually separated from the secondelastic membrane 15.

It should be noted that the connectingrod 1611 and thecross rod 1612 are of a split structure, that is, the connectingrod 1611 and thecross rod 1612 are not integrally formed, so that the slidingrod 1613 can pass through the throughhole 1d conveniently. Specifically, the connectingrod 1611 and the two slidingrods 1613 may be integrally formed, for example, integrally formed injection-molded parts; thecross bar 1612 may be integrally formed with the twoslide bars 1613, for example, as an integrally molded plastic.

In the embodiment of the present application, the connectingrod 1611 and the two slidingrods 1613 are integrally formed as an example.

For example, to facilitate the connection between the slidingrod 1613 and thecross bar 1612, in an embodiment, please refer to fig. 4, thecross bar 1612 has connectingholes 1612a at two opposite ends, and the connectingholes 1612a may be blind holes or through holes, which is not limited herein. A second end of the slidingrod 1613 is fixedly inserted into the connectinghole 1612a, for example, the slidingrod 1613 is inserted into the connectinghole 1612a and then bonded or ultrasonically welded to the inner wall of the connectinghole 1612 a; alternatively, the slidingrod 1613 is in interference fit with the connectinghole 1612a, and the two are fixedly connected by friction.

To facilitate quick positioning of the cross-bar 1612 during assembly, in one embodiment, and with continued reference to fig. 4, the circumferential surface of the second end of the slidingbar 1613 defines astep surface 1613a, and the cross-bar 1612 abuts thestep surface 1613 a. During assembly, only the connectingholes 1612a on thecross rod 1612 need be aligned with the slidingrods 1613 and pushed towards the slidingrods 1613 until thecross rod 1612 abuts against the step surfaces 1613a, and then thecross rod 1612 and the slidingrods 1613 can be quickly assembled through the step surfaces 1613a, the relative positions of thecross rod 1612 and the slidingrods 1613 can be guaranteed, and the batch consistency of products is improved.

In one embodiment, referring to fig. 7, thelatch 1614 protrudes from the surface of the slidingrod 1613, and thelatch 1614 is located on a side of one slidingrod 1613 facing away from the other slidingrod 1613. It is understood that thelatch mechanism 1614 may be provided on one slidingbar 1613, or thelatch mechanisms 1614 may be provided on both slidingbars 1613. The embodiment of the present application is described by taking an example in which the two slidingrods 1613 are both provided with alatch structure 1614.

The specific structure of thelatch structure 1614 is not limited, for example, in the embodiment of the present application, thelatch structure 1614 is substantially a plate extending along the length of the slidingrod 1613.

Referring to fig. 4, in an embodiment, a sliding groove 1f is formed on a wall surface corresponding to the throughhole 1d, and thelatch structure 1614 is linearly slidably engaged with the sliding groove 1f along the thickness direction of the infusion cassette 1, that is, thelatch structure 1614 can slide in the sliding groove 1f in a reciprocating manner along the thickness direction of the infusion cassette 1; astopper portion 110 protruding toward the avoidance hole is formed on thefirst member 11; when thelocking mechanism 16 moves towards thethird member 13 side until thelatch structure 1614 does not interfere with the stoppingportion 110, thelocking mechanism 16 can swing along the length direction of the infusion cassette 1, thelatch structure 1614 slides into the sliding groove 1f, and thelatch structure 1614 abuts against the stoppingportion 110 side towards thesecond member 12, so that thelocking mechanism 16 is locked in the second open state.

In one embodiment, part of the structure of the mountingframe 161 protrudes from the side of thefirst member 11 facing the pump body 2; aconvex column 281 used for pushing the mountingframe 161 is formed on one side of thepump head frame 28 facing the infusion box 1, and aninclined surface 281a is formed at the end part of theconvex column 281 facing one end of the infusion box 1; during the assembly of the feeding cassette 1 and the pump body 2, theinclined surface 281a pushes the mountingframe 28 to move toward thethird member 13 to fix thelocking mechanism 16 at the position of the first open state.

Theinclined surface 281a has a positioning function on the mountingframe 28, and after the infusion box 1 and the pump body 2 are combined, theinclined surface 281a abuts against the mountingframe 161, so that the mountingframe 161 is prevented from moving along the thickness direction of the infusion box 1 and swinging along the length direction of the infusion box 1, that is, thelocking mechanism 16 is fixed at the current position and cannot displace, and the working reliability of thelocking mechanism 16 can be improved.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (14)

Translated fromChinese

1.一种输液泵，包括泵体(2)和输液器，所述输液器包括输液匣(1)以及与所述输液匣(1)连接的输液管(3)，所述泵体(2)和所述输液匣(1)可分离地配合，其特征在于：1. An infusion pump, comprising a pump body (2) and an infusion device, the infusion device comprising an infusion box (1) and an infusion tube (3) connected with the infusion box (1), the pump body (2) ) and the infusion box (1) can be detachably matched, characterized in that:所述输液匣(1)中具有流道(1a)，所述输液匣(1)包括第一构件(11)、第二构件(12)以及第一弹性膜片(14)，所述第二构件(12)朝向所述第一构件(11)的一侧形成有第一凹槽(121)；所述第一弹性膜片(14)设置于所述第一构件(11)和所述第二构件(12)之间以密封地覆盖所述第一凹槽(121)，所述第一弹性膜片(14)和所述第一凹槽(121)共同构成所述流道(1a)的至少一部分；所述第一凹槽(121)包括泵腔(121a)、位于所述泵腔(121a)上游的第一制动腔(121b)以及位于所述泵腔(121a)下游的第二制动腔(121c)；所述泵腔(121a)、所述第一制动腔(121b)以及所述第二制动腔(121c)呈直线排布；The infusion box (1) is provided with a flow channel (1a), the infusion box (1) comprises a first member (11), a second member (12) and a first elastic diaphragm (14), the second A first groove (121) is formed on the side of the member (12) facing the first member (11); the first elastic diaphragm (14) is arranged on the first member (11) and the first member (11) The first groove (121) is sealedly covered between the two components (12), and the first elastic diaphragm (14) and the first groove (121) together constitute the flow channel (1a) At least a part of the pump cavity (121); the first groove (121) includes a pump cavity (121a), a first brake cavity (121b) located upstream of the pump cavity (121a), and a first brake cavity (121b) located downstream of the pump cavity (121a) Two brake chambers (121c); the pump chamber (121a), the first brake chamber (121b) and the second brake chamber (121c) are arranged in a straight line;泵体(2)设置于第一构件(11)背离第二构件(12)的一侧，所述泵体(2)包括泵头架(28)、转动地设置于所述泵头架(28)上的凸轮轴(24)、与所述泵腔(121a)挤压配合的柱塞组件(21)、与所述第一制动腔(121b)挤压配合的第一制动阀柱组件(22)、与所述第二制动腔(121c)挤压配合的第二制动阀柱组件(23)、以及驱动所述凸轮轴(24)转动的动力单元(25)，所述柱塞组件(21)、所述第一制动阀柱组件(22)以及所述第二制动阀柱组件(23)的端部均与所述凸轮轴(24)的转动表面滑动抵接，所述凸轮轴(24)在转动过程中驱动所述柱塞组件(21)、所述第一制动阀柱组件(22)、所述第二制动阀柱组件(23)依序蠕动挤压所述第一弹性膜片(14)以使得流道(1a)中的液体产生定向流动。The pump body (2) is arranged on the side of the first member (11) away from the second member (12), and the pump body (2) includes a pump head frame (28), which is rotatably arranged on the pump head frame (28). ), the plunger assembly (21) press-fitted with the pump chamber (121a), and the first brake spool assembly press-fitted with the first brake chamber (121b) (22), a second brake spool assembly (23) press-fitted with the second brake chamber (121c), and a power unit (25) for driving the camshaft (24) to rotate, the column The ends of the plug assembly (21), the first brake spool assembly (22) and the second brake spool assembly (23) all slide against the rotating surface of the camshaft (24), During rotation, the camshaft (24) drives the plunger assembly (21), the first brake spool assembly (22), and the second brake spool assembly (23) to creep and squeeze in sequence. The first elastic diaphragm (14) is pressed to cause a directional flow of the liquid in the flow channel (1a).2.根据权利要求1所述的输液泵，其特征在于，所述第一制动阀柱组件(22)以及所述第二制动阀柱组件(23)挤压所述第一弹性膜片(14)的方式为全挤压；所述柱塞组件(21)挤压所述第一弹性膜片(14)的方式为半挤压。2. The infusion pump according to claim 1, wherein the first brake spool assembly (22) and the second brake spool assembly (23) press the first elastic diaphragm The method of (14) is full extrusion; the method of pressing the first elastic diaphragm (14) by the plunger assembly (21) is half extrusion.3.根据权利要求1所述的输液泵，其特征在于，所述柱塞组件(21)用于挤压所述第一弹性膜片(14)的端面为圆弧面，所述泵腔(121a)的形状与所述柱塞组件(21)的端面形状适配；和/或，所述第一制动阀柱组件(22)用于挤压所述第一弹性膜片(14)的端面为圆弧面，所述第一制动腔(121b)的形状与所述第一制动阀柱组件(22)的端面形状适配；和/或，所述第二制动阀柱组件(23)用于挤压所述第一弹性膜片(14)的端面为圆弧面，所述第二制动腔(121c)的形状与所述第二制动阀柱组件(23)的端面形状适配。3 . The infusion pump according to claim 1 , wherein the end surface of the plunger assembly ( 21 ) used to squeeze the first elastic diaphragm ( 14 ) is an arc surface, and the pump cavity ( 3 . The shape of 121a) is adapted to the shape of the end face of the plunger assembly (21); and/or, the first brake spool assembly (22) is used for pressing the first elastic diaphragm (14). The end surface is an arc surface, and the shape of the first brake cavity (121b) is adapted to the shape of the end surface of the first brake spool assembly (22); and/or, the second brake spool assembly (23) The end surface for pressing the first elastic diaphragm (14) is a circular arc surface, and the shape of the second brake cavity (121c) is the same as that of the second brake valve column assembly (23). End face shape adaptation.4.根据权利要求1所述的输液泵，其特征在于，所述输液匣(1)沿长度方向的第一端设置有进液口(1b)，所述输液匣(1)沿长度方向的第二端设置有出液口(1c)，在垂直于所述输液匣(1)厚度方向的平面内的投影中，所述流道(1a)、所述进液口(1b)以及所述出液口(1c)呈直线排布。4. The infusion pump according to claim 1, characterized in that, the first end of the infusion box (1) along the length direction is provided with a liquid inlet (1b), and the infusion box (1) along the length direction is provided with a liquid inlet (1b). The second end is provided with a liquid outlet (1c), in the projection on a plane perpendicular to the thickness direction of the infusion box (1), the flow channel (1a), the liquid inlet (1b) and the The liquid outlet (1c) is arranged in a straight line.5.根据权利要求1所述的输液泵，其特征在于，所述动力单元(25)包括电机(251)和传动机构(252)，传动机构(252)连接于电机(251)的转轴和凸轮轴(24)之间。5. The infusion pump according to claim 1, wherein the power unit (25) comprises a motor (251) and a transmission mechanism (252), and the transmission mechanism (252) is connected to the rotating shaft and the cam of the motor (251) between shafts (24).6.根据权利要求1所述的输液泵，其特征在于，所述输液匣(1)还包括第三构件(13)、第二弹性膜片(15)以及锁止机构(16)，所述第二构件(12)背离所述第一构件(11)的一侧形成有第二凹槽(122)；所述第二凹槽(122)与所述第一凹槽(121)连通且位于所述第一凹槽(121)的下游；所述第二弹性膜片(15)设置于所述第二构件(12)和所述第三构件(13)之间以密封地覆盖所述第二凹槽(122)；6. The infusion pump according to claim 1, characterized in that, the infusion box (1) further comprises a third member (13), a second elastic diaphragm (15) and a locking mechanism (16), the A second groove (122) is formed on the side of the second member (12) facing away from the first member (11); the second groove (122) communicates with the first groove (121) and is located at Downstream of the first groove (121); the second elastic membrane (15) is disposed between the second member (12) and the third member (13) to sealingly cover the first Two grooves (122);所述锁止机构(16)包括安装架(161)以及固定设置于所述安装架(161)上的止液塞(162)，所述止液塞(162)能够挤压所述第二弹性膜片(15)以关闭所述流道(1a)，所述锁止机构(16)能够在关闭所述流道(1a))的关闭状态或开放所述流道(1a))的开放状态之间切换。The locking mechanism (16) includes an installation frame (161) and a liquid stopper (162) fixedly arranged on the installation frame (161), and the liquid stopper (162) can squeeze the second elastic The diaphragm (15) is used to close the flow channel (1a), and the locking mechanism (16) can be in a closed state for closing the flow channel (1a)) or in an open state for opening the flow channel (1a)). switch between.7.根据权利要求6所述的输液泵，其特征在于，所述开放状态包括第一开放状态；当所述输液匣(1)与所述泵体(2)组合过程中，所述泵头架(28)迫使所述安装架(161)朝向所述第三构件(13)方向运动以驱动所述锁止机构(16)从关闭状态切换至所述第一开放状态并保持在所述第一开放状态。7. The infusion pump according to claim 6, wherein the open state comprises a first open state; when the infusion cassette (1) is combined with the pump body (2), the pump head The bracket (28) forces the mounting bracket (161) to move towards the third member (13) to drive the locking mechanism (16) to switch from the closed state to the first open state and to remain in the first open state. an open state.8.根据权利要求7所述的输液泵，其特征在于，所述输液匣(1)包括弹性件(17)，所述弹性件(17)对所述安装架(161)施加作用力以使得所述锁止机构(16)能够保持在关闭所述流道(1a))的关闭状态。8. The infusion pump according to claim 7, wherein the infusion box (1) comprises an elastic member (17), and the elastic member (17) exerts a force on the mounting bracket (161) to make The locking mechanism (16) can be maintained in a closed state that closes the flow passage (1a).9.根据权利要求8所述的输液泵，其特征在于，当所述输液匣(1)与所述泵体(2)分离时，所述弹性件(17)驱动所述锁止机构(16)从第一开放状态切换至关闭状态并保持在关闭状态。9. The infusion pump according to claim 8, characterized in that, when the infusion cassette (1) is separated from the pump body (2), the elastic member (17) drives the locking mechanism (16) ) switches from the first open state to the closed state and remains in the closed state.10.根据权利要求7所述的输液泵，其特征在于，所述开放状态包括第二开放状态，所述锁止机构(16)包括设置于所述安装架(161)上的栓锁结构(1614)；所述第一构件(11)、所述第二构件(12)以及所述第三构件(13)中的至少一者与所述栓锁结构(1614)锁止配合，以使得所述锁止机构(16)能够进入第二开放状态并保持在第二开放状态。10. The infusion pump according to claim 7, wherein the open state comprises a second open state, and the locking mechanism (16) comprises a latching structure (16) provided on the mounting bracket (161). 1614); at least one of the first member (11), the second member (12) and the third member (13) is in locking engagement with the latching structure (1614) so that all The locking mechanism (16) can enter into the second open state and remain in the second open state.11.根据权利要求7所述的输液泵，其特征在于，所述安装架(161)的部分结构凸出于所述第一构件(11)朝向所述泵体(2)的一侧；所述泵头架(28)朝向所述输液匣(1)的一侧形成有用于推动所述安装架(161)的凸柱(281)，所述凸柱(281)朝向所述输液匣(1)一端的端部形成有倾斜面(281a)；在所述输液匣(1)和所述泵体(2)组合过程中，所述倾斜面(281a)推动所述安装架(161)朝向所述第三构件(13)的方向运动以将所述锁止机构(16)固定在第一开放状态的位置。11. The infusion pump according to claim 7, wherein a part of the structure of the mounting bracket (161) protrudes from the side of the first member (11) facing the pump body (2); A protruding post (281) for pushing the mounting bracket (161) is formed on the side of the pump head frame (28) facing the infusion cartridge (1), and the protruding post (281) faces the infusion cartridge (1). ) is formed with an inclined surface (281a) at the end of one end; during the combination process of the infusion cartridge (1) and the pump body (2), the inclined surface (281a) pushes the mounting bracket (161) toward the The directional movement of the third member (13) fixes the locking mechanism (16) in the position of the first open state.12.根据权利要求1所述的输液泵，其特征在于，所述第一凹槽(121)包括两个压力监测腔(121d)，其中一个所述压力监测腔(121d)设置于所述第一制动腔(121b)的上游，其中另一个所述压力监测腔(121d)设置于所述第二制动腔(121c)的下游，所述泵体(2)包括设置于所述泵头架(28)上的两个压力监测装置(26)，其中一个所述压力监测装置(26)设置于所述第一制动阀柱组件(22)背离所述柱塞组件(21)的一侧，其中另一个压力监测装置(26)设置于第二制动阀柱组件(23)背离所述柱塞组件(21)的一侧，所述柱塞组件(21)、所述第一制动阀柱组件(22)、所述第二制动阀柱组件(23)、以及所述两个压力监测装置(26)呈直线布置。12. The infusion pump according to claim 1, wherein the first groove (121) comprises two pressure monitoring chambers (121d), wherein one of the pressure monitoring chambers (121d) is disposed in the first groove (121d) The upstream of a brake chamber (121b), wherein the other pressure monitoring chamber (121d) is arranged downstream of the second brake chamber (121c), and the pump body (2) includes a pump head arranged on the pump head Two pressure monitoring devices (26) on the frame (28), wherein one of the pressure monitoring devices (26) is arranged on a side of the first brake spool assembly (22) away from the plunger assembly (21). side, wherein another pressure monitoring device (26) is arranged on the side of the second brake spool assembly (23) away from the plunger assembly (21), the plunger assembly (21), the first brake The movable spool assembly (22), the second brake spool assembly (23), and the two pressure monitoring devices (26) are arranged in a straight line.13.根据权利要求12所述的输液泵，其特征在于，位于所述第二制动腔(121c)下游的所述压力监测腔(121d)设置于所述第一凹槽(121)沿液体流动方向的末端处。13. The infusion pump according to claim 12, wherein the pressure monitoring chamber (121d) located downstream of the second braking chamber (121c) is disposed in the first groove (121) along the liquid at the end of the flow direction.14.根据权利要求1所述的输液泵，其特征在于，所述凸轮轴(24)能够正转和反转，当所述凸轮轴(24)正转，所述凸轮轴(24)驱动所述柱塞组件(21)、所述第一制动阀柱组件(22)、以及所述第二制动阀柱组件(23)依正向时序蠕动以驱动所述流道中的液体正向流动；当所述凸轮轴(24)反转，所述凸轮轴(24)驱动所述柱塞组件(21)、所述第一制动阀柱组件(22)、以及所述第二制动阀柱组件(23)依逆向时序蠕动以驱动所述流道中的液体逆向流动。14. The infusion pump according to claim 1, characterized in that the camshaft (24) can rotate forward and reversely, and when the camshaft (24) rotates forward, the camshaft (24) drives the The plunger assembly (21), the first brake spool assembly (22), and the second brake spool assembly (23) creep in a forward sequence to drive the liquid in the flow channel to flow in a forward direction ; When the camshaft (24) is reversed, the camshaft (24) drives the plunger assembly (21), the first brake spool assembly (22), and the second brake valve The column assembly (23) creeps in a reverse sequence to drive the liquid in the flow channel to flow in a reverse direction.

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