CN212089931U - Capsule tension ring injector - Google Patents

Abstract

The utility model provides a bag tension ring annotates ware with inject stable structure, include: a push-injection cylinder; the injection pushing head is arranged at the front end of the injection pushing barrel; the core rod can move back and forth in the injection cylinder and the injection head, and a core rod movement guide mechanism extending along the movement direction of the core rod relative to the injection cylinder/the injection head is arranged between the core rod and at least one of the injection cylinder and the injection head. By adopting the structure, the action stability of the push rod of the injector can be improved, and the success rate of the operation is increased.

Description

Capsule tension ring injector

Technical Field

The utility model relates to a bag tension ring injection device.

Background

The capsular tension ring is a compressible open ring, is usually made of PMMA material, is tightly attached to the capsular bag membrane after being implanted into the capsular bag, can maintain the tension of the capsular bag, prevents the posterior capsular membrane from folding, resists the contraction of the capsular bag, and maintains the integrity of the capsular bag. At present, most of capsular bag tension rings are C-shaped components with openings on main bodies, positioning holes are respectively arranged at two ends of the C-shaped components, and the C-shaped components are implanted into capsular bags through an implanter (injector) or implantation forceps and are used for congenital subluxation of crystalline lenses, rupture of suspensory ligaments before or during operation, weakness of the suspensory ligaments and risk of capsular bag shrinkage, especially for patients with high myopia.

At present, the application of the capsular tension ring in clinic can effectively improve the safety of operation, reduce the complications caused by the operation and be used as an auxiliary tool in the cataract operation process. Conventionally, tension rings have been mainly used to maintain the tension profile of the capsular bag, and there is a demand for further inhibiting the migration of lens epithelial cells into the posterior capsule and preventing the occurrence of opacification of the posterior capsule after operation.

The existing capsular tension ring injector comprises a preassembly type and a non-preassembly type, and generally comprises an implantation head (an injection head) and an injection part, wherein the implantation head is a slender round pipe with a certain radian, the outer diameter of the implantation head is about 1.2mm, and the wall thickness of the implantation head is about 0.2 mm. The injection part consists of an injection barrel and a push rod, and contains a filament with the diameter of about 0.3mm, and the front end of the filament is in a hook shape and is used for matching with the positioning hole of the capsular bag tension ring to load the tension ring. Compared with the preassembly type and the non-preassembly type, the preassembly type injection device is additionally provided with a tension ring preassembly position retaining structure which can enable a part of the bag tension ring to be accommodated in the injection head between the injection rod and the injection barrel. Compared with the preassembled bag tension ring injector, the non-preassembled bag injector has the advantages that the operation is complicated, and the operation steps are increased. Bladder bag tension ring injector

In operation, the capsular tension ring is very fine, and the eye tissue may be damaged by carelessness due to the operation on the eye. Therefore, during the operation, the injector is required to stably inject the capsular tension ring. Accordingly, there is a need for an improved structure of a pouch tension ring injector to prevent damage to eye tissue due to instability of the injector injection operation.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a bag tension ring annotates ware with inject stable knot constructs can ensure the stability of push rod action.

In order to achieve the above object, the utility model discloses a capsule bag tension ring injector with inject stable structure, include: a push-injection cylinder; the injection pushing head is arranged at the front end of the injection pushing barrel; the core rod can move back and forth in the injection cylinder and the injection head, and a core rod movement guide mechanism extending along the movement direction of the core rod relative to the injection cylinder or the injection head is arranged between the core rod and at least one of the injection cylinder and the injection head.

With the above configuration, since the core bar movement guide mechanism extending in the movement direction of the core bar with respect to the plunger barrel/plunger head is provided between the core bar and at least one of the plunger barrel and the plunger head, the stability of the operation of the core bar can be maintained.

The utility model discloses preferentially, the moving position of the core bar in the front and back direction comprises a tension ring preassembling position which enables a part of the bag tension ring to be accommodated in the injection head; the pre-installation position retaining mechanism is arranged between the core rod and the injection cylinder and is used for keeping the core rod at a pre-installation position of the tension ring; the preassembly position retaining mechanism comprises a limiting block arranged on the core rod; a pre-installation position retaining groove arranged on the peripheral wall of the barrel body part of the injection barrel, wherein the core bar is retained at the pre-installation position of the tension ring through the clamping of the limiting block and the pre-installation position retaining groove; the inner peripheral wall of the barrel body is further provided with a limit position limiting groove which is connected with the pre-mounting position retaining groove and is matched with the limiting block to limit the stroke limit position of the core rod, the pre-mounting position retaining groove and the limit position limiting groove are formed by grooves with bottoms, and the limiting block, the pre-mounting position retaining groove and the limit position limiting groove form the core rod movement guide mechanism.

With the structure, the limit position limiting groove is composed of the groove with the bottom, so compared with the structure of the through groove, the limit position limiting groove has the technical effects that foreign matters such as dust and the like can be prevented from entering the injection cylinder to cause pollution and influence on smooth injection.

The utility model discloses it is preferred, the two half formula structures of a section of thick bamboo for limiting the trench position at extreme position along the subdivision of fore-and-aft direction plane, pre-installation position keeps the groove to form on a half section of thick bamboo wholly.

By adopting the structure, the preassembly position retaining groove can be integrally formed on the half cylinder, and the phenomenon that the preassembly position retaining groove with a complex shape spans the half cylinder to form and forms an uneven part at the butt joint part is avoided, so that the preassembly position retaining groove can smoothly guide the movement of the limiting block, and the use stability of the injector is further improved.

The utility model discloses preferably, be equipped with the guide way that extends along the fore-and-aft direction on the internal perisporium of plunger, the rear end of guide way is open, be equipped with on the core bar the gomphosis in the guide way can be followed the gliding gib block of guide way, by the guide way the gib block constitutes core bar removes guiding mechanism.

By adopting the structure, the core rod can be ensured to move forwards and backwards along the guide groove of the injection cylinder and cannot rotate through the guide groove and the guide strip which is embedded into the guide groove and slides along the guide groove. Therefore, the phenomenon that the bag tension ring rotates beyond the required operation action during the operation due to the rotation between the core rod and the cylinder body can be avoided, the stability of the injector can be improved, and the success probability of the operation is increased.

The utility model discloses preferred, the core bar comprises thumb handle, push rod, piston, spring fixed column, push pin that connect gradually; still including installing one end and piston butt on the spring fixing post, the reset spring of the other end and push syringe head butt.

By adopting the structure, the capsular tension ring can be pulled into the injection head by the restoring force provided by the return spring, and the operability of the injector in the operation can be improved.

By adopting the structure, the guide grooves and the guide strips can be used for limiting the rotation of the core rod in the cylinder body in the whole process of the back-and-forth movement of the core rod in the cylinder body. Further improving the stability of the injector in use.

The utility model discloses preferably, the piston is including the O type circle groove that is used for installing O type circle.

Adopt as above structure, can through O type circle and the internal perisporium sliding contact of the barrel body portion of the section of thick bamboo of injecting, the speed of restriction bolus, the bolus speed of messenger's operation time is more stable, can also provide good use simultaneously and experience.

The utility model discloses preferentially, the outer peripheral surface of the core bar opposite to the side of the injection cylinder is provided with a reinforcing rib extending along the front and back direction; the push injection head is internally provided with a groove matched with the reinforcing rib, and the reinforcing rib and the groove form the core rod moving guide mechanism. The utility model discloses it is preferred, the strengthening rib sets up on the outer peripheral face of push pin. The utility model discloses preferentially, the core bar has the push pin, the strengthening rib sets up on the outer peripheral face of push pin. The reinforcing rib may be provided on an outer circumferential surface of a rear portion of the push pin.

Adopt as above structure, can increase the intensity of push pin, the recess of cooperation simultaneously can prevent that the push pin from taking place to buckle or rotate because of the atress, can improve the stability that injector used in the operation.

The utility model discloses it is preferred, spring fixing column is the unchangeable cylindricality of axial external diameter size.

Adopt as above structure, when pushing the operation, can make reset spring cover gradually establish spring fixed column on, can prevent that reset spring from taking place the wrench movement in compression process. Further improving the stability of the injection operation in the operation.

Drawings

FIG. 1 is a front view of a pre-filled bladder tension ring injector according to an embodiment of the present invention in the pre-filled bladder tension ring state;

FIG. 2 is a front view of the pre-assembled bladder tension ring injector with the injector cartridge open;

FIG. 3 shows the structure of the injection head in an embodiment in which (a) is a front view and (b) is a sectional view;

FIG. 4 shows the construction of the plunger in the open state;

FIG. 5 shows an oblique view of the upper barrel portion of the plunger barrel;

FIG. 6 is a schematic view for illustrating a structure of a curved stopper groove;

fig. 7 shows a structure of a stopper in the present embodiment, in which (a) is a front view and (b) is a side view;

FIG. 8 is a front view of a core pin in an embodiment;

FIG. 9 is an oblique view of the core rod;

FIG. 10 is a drawing illustrating the process of pre-assembling a bladder tension ring as contemplated in an embodiment, with the core rod in a most advanced position of travel;

fig. 11 is a drawing for explaining a pre-installation process of a capsular bag tension ring according to an embodiment, and shows a state where a stopper is positioned from a linear type stopper groove to a curved type stopper groove;

FIG. 12 shows a front view of the upper barrel portion of the plunger barrel;

fig. 13 is a drawing for explaining the structure of a small hole for operating a stopper in an ejector, wherein (a) is a drawing obtained when the lower half cylinder portion of the ejector is viewed from the back side, (b) is a drawing obtained when the lower half cylinder portion of the ejector is viewed from the outside, and (c) is a drawing obtained when the upper half cylinder portion of the ejector is viewed from the outside;

fig. 14-15 fig. 14 shows the construction of the capsular tension ring;

fig. 15 shows a structure of a core bar according to modification 1;

fig. 16 and 17 show the structure of the front part of the syringe according to modification 3

Description of the reference numerals

100 pre-filled bladder tension ring injectors; 10, a push injection cylinder; 10A lower half cylinder part; 10B an upper half cylinder part; 11 a cylindrical body portion; 12a grip portion; 12A a grip portion; 20 core rods; 20a guide bar; 21a push rod; 21' a push rod; 21a indicates a groove; 22a piston; 22a type ring groove; 22b a stop block groove; 23 pushing the needle; 23a reinforcing ribs; 24 spring fixing posts; 24a base portion; 25 a limiting block; 26-shaped ring; athumb handle 27; 30a push injection head; 30a lumen; 31a plunger connecting portion; 31a rotation stop projection; 31a1 positioning groove; 31b card slots; 31c end face; 31d spring positioning protrusions; 32 a transition portion; 33a guide tube portion; 33a beveled portion; 40 a return spring; 100 a syringe; 110 curved limiting grooves; 110a guide part; 110b holding part; a 110c bump; 111 a guide groove; 112a, aperture No. 1; 112b, aperture No. 2; 113 straight line shaped limit groove; 113A lower half-linear limit groove; 113B upper half straight line shaped limit groove; 114, buckling; 115 grooves; 116 engaging the concave portion; 117a retaining wall; 117a through hole; 117b latching recesses; 117c positioning projections; 120 clamping convex parts; 180 intervals are formed; 200 capsular bag tension rings; 201, positioning holes; 231 loading the column; 231a loading column; 250 a base portion; 251 a post portion.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings. It should be noted that the following embodiments are described by way of example and not limitation with respect to a pre-filled capsular tension ring and that the teachings of the present invention are equally applicable to non-pre-filled capsular tension ring injectors.

[ integral Structure ]

Fig. 1 shows a front view of a pre-filled capsular tension ring consisting of a capsular tension ring and a pre-filled syringe. Fig. 2 shows a front view of the pre-filled capsular tension ring injector with the injector cartridge open. Fig. 14 shows the construction of the capsular tension ring.

As shown in fig. 1, typically, pre-filled bag tension ring injector 100 (sometimes referred to simply as an injector) is pre-filled withbag tension ring 200 at the time of shipment, and the assembledbag tension ring 200 and pre-filled bagtension ring injector 100 form a pre-filled bag tension ring. The pre-filled bladdertension ring injector 100 mainly comprises aninjector cylinder 10, acore rod 20, aninjector head 30, and areturn spring 40. Thesyringe 10 is a main body of the pouchtension ring syringe 100, and is a long cylinder as a whole, and asyringe head 30 is mounted at the front end thereof, and aninner cavity channel 30a (fig. 3) of thesyringe head 30 is communicated with the space in thesyringe 10.

As shown in fig. 14, thecapsular tension ring 200 is a C-shaped split ring withpositioning holes 201 formed at both ends for loading on the tension ring injector (implanter) 100. Thebag tension ring 200 can be pulled into theinjection head 30 by thepush pin 23 in a state where aloading pin 231a (fig. 8 and 9) of thepush pin 23 described later is hooked on thepositioning hole 201 at one end thereof, and when thebag tension ring 200 is gradually pulled in, thebag tension ring 200 is deformed, and immediately before an operation to push thebag tension ring 200 into the human eye, thebag tension ring 200 is completely accommodated in theinjection head 30 in a nearly straightened state.

Thestem 20 is disposed so as to be movable back and forth in theplunger 10, and can pull thebag tension ring 200 into theplunger 30 or push thebag tension ring 200 positioned in theplunger 30 forward (push operation).

Further, areturn spring 40 is provided between thestem 20 and theplunger barrel 10, and thereturn spring 40 urges thestem 20 rearward. When the operator pushes thestem 20 forward, it is necessary to overcome the urging force of thereturn spring 40, and when the operator releases the urging force of thestem 20, thestem 20 is moved (returned) rearward by thereturn spring 40.

In the pre-installed bagtension ring injector 100 of the present invention, thecore rod 20 has three positions in the stroke range in the front-back direction, the foremost position, the rearmost position and the tension ring pre-installation position located therebetween, and at the foremost position, the front end of thepush pin 23 extends out of thepush pin 30, and at this position, either thebag tension ring 200 can be hung on thepush pin 23 by an operator, or thepush pin 23 can push thebag tension ring 200 out of thepush pin 30 completely; in the rearmost position, either the assembled initial state of the capsulartension ring inserter 100 or the ready-to-operate state in which thecapsular tension ring 200 is completely pulled into theinserter head 30 by theejector pin 23; in the tension ring pre-load position, thepush pin 23 pulls a portion of thepouch tension ring 200 into theinjection head 30.

In particular, to retain thecore pin 20 in the tension ring pre-assembly position, the present invention provides a bladdertension ring injector 100 having a pre-assembly position retaining mechanism, which will be described in detail below.

The respective constituent components of the bagtension ring injector 100 will be described in detail below.

In the present specification, in combination with the above, the direction in which thepouch tension ring 200 is pushed out of theinjector 100 is defined as the front direction, and the opposite direction is defined as the rear direction. In the present embodiment, the front-rear direction coincides with the axial direction of theplunger 10 as the plunger body, and as described in the present embodiment, the "circumferential direction" coincides with the circumferential direction of theplunger 10, and the "radial direction" coincides with the radial direction (outer-inner circumferential direction) of theplunger 10, unless otherwise specified.

[ Pushing head ]

Fig. 3 shows the structure of the injection head in the present embodiment, in which (a) is a front view and (b) is a sectional view.

As shown in fig. 3, theinjector head 30 is a single-piece polymer injection-molded component, and includes an injectortube connecting portion 31 for connecting theinjector tube 10, atransition portion 32 whose outer diameter gradually decreases from the rear side to the front side, and a thin tubularguide tube portion 33 in this order from the rear side to the front side. Theplunger connecting portion 31 has an annularengaging groove 31b provided on the outer peripheral surface and a pair ofrotation preventing projections 31a projecting radially outward from the bottom surface of the engaginggroove 31b, and the pair ofrotation preventing projections 31a are located at circumferentially opposite positions (spaced by 180 degrees). Further, theplunger connecting portion 31 has aspring positioning projection 31d projecting rearward from therear end surface 31c for positioning the front end portion of thereturn spring 40.

As shown in fig. 3 (b), alumen channel 30a is provided in thebolus head 30 so as to pass through the bolus head in the front-rear direction, and thelumen channel 30a can completely accommodate thebag tension ring 200.

Theinjection head 30 has an elongatedguide tube part 33 at its front end, and abevel part 33a with an angle of approximately 45 degrees at its front end to facilitate insertion into an incision for ocular surface surgery. As shown in fig. 3, the section of the X-section (section 1 and inside the guide tube part 33) of thelumen channel 30a of thebolus injection head 30 is "□" and the section of the Y-section (section 2) is "convex", so that thelumen channel 30a is engaged with thepush pin 23 described later, and thepush pin 23 can slide in thelumen channel 30a and is guided by thelumen channel 30 a.

[ Syringe ] for injection

Fig. 4 shows the structure of the plunger in the open state. FIG. 5 shows an oblique view of the upper barrel portion of the plunger barrel. Fig. 6 is a schematic view for illustrating a structure of a curved stopper groove.

As shown in fig. 1, 2, 4, and 5, theplunger 10 is formed in an elongated cylindrical shape as a whole, and includes acylindrical body 11 and an annular grip portion 12 formed on an outer peripheral surface of thecylindrical body 11. In the present embodiment, theplunger 10 has a two-half structure split in the axial direction, and includes a lowerhalf tube portion 10A (1 st half tube portion) and an upperhalf tube portion 10B (2 nd half tube portion) that are injection molded, respectively. In the following description, the structure on the lowerhalf tube portion 10A side is accompanied by the capital letter "a" after the arabic numerals, the structure on the upperhalf tube portion 10B side is accompanied by the capital letter "B" after the arabic numerals, and the capital letters "a" and "B" are removed when the upper half portion and the lower half portion are not distinguished. The "upper" and "lower" of the lower halftubular portion 10A and the upper halftubular portion 10B are used for convenience of description, and do not limit the present invention.

The lowerhalf cylinder part 10A and the upperhalf cylinder part 10B are buckled together, specifically, abuckle 114 protruding towards the upperhalf cylinder part 10B is arranged on the lowerhalf cylinder part 10A, agroove 115 corresponding to the position is arranged on the outer peripheral surface of the upperhalf cylinder part 10B, and thebuckle 114 is embedded into thegroove 115; further, an engagingconcave portion 116 is formed in thegrip portion 12A of the lower halftubular portion 10A, an engagingconvex portion 120 is formed in the upper halftubular portion 10B, and the engagingconcave portion 116 is engaged with the engagingconvex portion 120.

In addition, a linear stopper groove 113, acurved stopper groove 110, and aguide groove 111 are provided on the inner peripheral wall of thecylindrical body 11. Linear limit groove 113 is used for injecing the stroke extreme position (foremost position and rearmost position) ofcore bar 20, corresponds to the utility model provides a extreme position restriction groove, curvilinearfigure spacing groove 110 are used for keepingcore bar 20 in tension ring pre-installation position, correspond to the utility model provides a pre-installation position holding groove, guideway 111 are used for guiding the back-and-forth movement ofcore bar 20.

In the present embodiment, the linear stopper groove 113, thecurved stopper groove 110, and theguide groove 111 are each formed by a bottomed groove provided on the inner peripheral wall of thebarrel portion 11 of theplunger barrel 10, that is, these grooves are impermeable and do not penetrate through the peripheral wall of thebarrel portion 11 of theplunger barrel 10.

The linear stopper groove 113 is opened at a position spaced 90 degrees from theguide groove 111 in the circumferential direction, and extends linearly in the front-rear direction. The linear stopper groove 113 is closed at both front and rear ends thereof, so that the stroke limit position of thecore bar 20 is defined by blocking the movement of thestopper 25 as described later. Theguide groove 111 has a rear end opened (an opening is formed in a rear end surface of the cylindrical body 11), and a front end extending forward of a front end of the linear stopper groove 113, and guides thecore rod 20 to move forward and backward by engaging with aguide bar 20a on thecore rod 20, which will be described later.

Thecurved stopper groove 110 is connected to the linear stopper groove 113 at a predetermined position in the middle of the linear stopper groove 113, extends in a curved shape to one side (one side in the circumferential direction) of the linear stopper groove 113, and thestopper 25 described later can be moved from the linear stopper groove 113 and held in thecurved stopper groove 110, thereby holding thecore rod 20 at the tension ring pre-installation position.

As shown in fig. 4 to 6, thecurved stopper groove 110 is shaped like a "v" as a whole, and includes aguide portion 110a extending obliquely forward to one side of the linear stopper groove 113, and aposition holding portion 110b folded back from the front end of theguide portion 110a and extending continuously to one side of the linear stopper groove 113 but extending rearward. In addition, the position of the foremost end of the corner portion in the front-rear direction is set so that a part of thebag tension ring 200 is still accommodated in the push-injection head 30 when thestopper 20 moves thereto, thereby suppressing thebag tension ring 200 from falling off. Theguide portion 110a guides thestopper 20 from the linear stopper groove 113 to theposition holding portion 110b, and theposition holding portion 110b holds the position of thestopper 20. Specifically, as shown in fig. 6, thestopper 20 moves from a position C continuous with the linear stopper groove 113 along theguide portion 110a to a position D which is a corner portion between theguide portion 110a and theposition holding portion 110b, and then moves from the position D to a position E in theposition holding portion 110b and is held at the position E (to be specifically described later). The movement path of the stopper 20 (the column portion 251) shown in fig. 6 substantially coincides with the center line of theguide portion 110a and the holdingportion 110 b. The groove widths of theguide portion 110a and the holdingportion 110b are slightly larger than thecolumn portion 251 of thestopper 20.

In the present embodiment, the corner portion between theguide portion 110a and theposition holding portion 110b is set so that thepost portion 251 of thestopper 25, which will be described later, can move in the circumferential direction from theposition holding portion 110b to theguide portion 110a only by the forward and backward movement of thecore rod 20 when the post portion is moved forward and backward by thecore rod 20, but cannot move in the circumferential direction from theguide portion 110a to theposition holding portion 110b only by the forward and backward movement of thecore rod 20.

In addition, in the present embodiment, theguide groove 111 is formed in the lowersemi-cylindrical portion 10A; one half of the linear limiting groove 113 is formed in the lower half-cylinder 10A (lower half-linear limitinggroove 113A), and the other half is formed in the upper half-cylinder 10B (upper half-linear limitinggroove 113B), and a complete linear limiting groove 113 is formed by buckling the lower half-cylinder 10A and the upper half-cylinder 10B; acurved stopper groove 110 is formed on the upperhalf cylinder portion 10B. In this way, by forming the linear stopper groove 113 in two halves, thecurved stopper groove 110 is integrally formed in one half-cylinder portion (the upper half-cylinder portion 10B), and uneven portions are prevented from being formed at the butt joint portion by thecurved stopper groove 110 having a complicated shape formed across the half-cylinder portion, so that thecurved stopper groove 110 can smoothly guide the movement of thestopper 25.

As shown in fig. 4 and 5, a lockingwall 117 protruding radially inward is formed on the inner peripheral surface of the distal end portion of thecylindrical body portion 11, a throughhole 117a penetrating in the front-rear direction is formed on the inner peripheral side of the lockingwall 117, a pair of locking recesses 117B recessed radially outward is formed on the inner peripheral surface of the throughhole 117a, and half of the locking recess 117B is formed in the upper halfcylindrical portion 10B and half is formed in the lower halfcylindrical portion 10A. The lockingwall 117 is fitted into the engaginggroove 31b of theplunger connecting portion 31 of theplunger 30, and prevents theplunger 30 from being separated forward from theplunger 10 by abutting the front end surface thereof against the front wall surface of the engaginggroove 31 b; further, therotation preventing projection 31a of theplunger connecting portion 31 is fitted into the engagingrecess 117b, thereby preventing the rotation of theplunger 30.

When thetension ring plunger 100 is assembled, theplunger 30 can be fixed to theplunger 10 by fitting theengaging wall 117 of one of theupper half cylinder 10B and thelower half cylinder 10A into the engaging groove 31B of theplunger connecting portion 31 of theplunger 30 in a state where theupper half cylinder 10B and thelower half cylinder 10A are opened, and then engaging theupper half cylinder 10B with thelower half cylinder 10A.

In the present embodiment, thebarrel portion 11 of theplunger 10 is further provided with a1 stsmall hole 112a and a 2 ndsmall hole 112b (fig. 13) used when thestopper 25 is operated, but for the sake of easy understanding, the detailed configuration will be described after thestopper 25 is described in detail.

[ core bar ]

Fig. 8 is a front view of the core bar in the present embodiment. Fig. 9 is an oblique view of the core rod.

As shown in fig. 8 and 9, thecore rod 20 is a one-piece injection molded component having, in order from the rear to the front: thumb handle 27,push rod 21,piston 22,spring fixing column 24 andpush pin 23.

Thethumb grip 27 is provided at the rear end of theplunger 21, is always exposed to the outside of thebarrel 10, is circular when viewed from the front-rear direction, and has a rear end face formed in a shape to which the thumb can easily be attached, and allows the operator to perform a pushing operation. Thepush rod 21 is a rod-shaped member having a cross-section, the front end of which is connected to thepiston 22, two annular O-ring grooves 22a are formed in the outer peripheral surface of thepiston 22, and a silicone O-ring 26 (fig. 2, 10, and 11) is fitted in the O-ring grooves and slidably contacts the inner peripheral wall of thebody portion 11 of theplunger 10 via the O-ring 26, thereby stabilizing the pushing speed and providing a good use experience. Anannular stopper groove 22b is formed on the outer peripheral surface of thepiston 22 on the front side of the O-ring groove 22a, and thestopper groove 22b is used for attaching thestopper 25.

In the present embodiment, thepush rod 21 and theplunger 22 are provided withguide bars 20a (guide projections) extending in the front-rear direction on the outer peripheral surfaces thereof, and the guide bars 20a are fitted into theguide grooves 111 on the inner peripheral surface of thebarrel portion 11 of theplunger 10 and are slidable along theguide grooves 111, so that thepush rod 21 and theplunger 22 are guided so as to move theentire stem 20 forward and backward, and the stem 20 (particularly, the push pin 23) is prevented from rotating.

Aspring fixing post 24 is connected to the front end of thepiston 22, thespring fixing post 24 is a columnar shape that gradually tapers forward, and areturn spring 40 is fitted over thespring fixing post 24, and the rear end surface thereof abuts against the front end of thepiston 22. A thin rod-shaped push pin 23 (push component) is connected to the tip of thespring fixing post 24, and arib 23a extending in the front-rear direction is provided on the lower outer peripheral surface of the rear part of thepush pin 23, and thisrib 23a is engaged with the downward "convex" cross section of the Y-section (2 nd section) of the push head 30 (substantially, a downward concave portion is formed and engaged with this concave portion). Further, a flat surface portion (a flat surface portion facing the outer peripheral side) parallel to the front-rear direction (the longitudinal direction of the push pin 23) is formed at the tip end portion of thepush pin 23, and aloading column 231a protruding in a cylindrical shape toward the outer peripheral side is provided on the flat surface portion, so that a hook-shaped portion is formed at the tip end portion of thepush pin 23, and theloading column 231a can be inserted into a positioning hole 201 (fig. 10) at one end of thebag tension ring 200 to hook thebag tension ring 200.

[ Limited block ]

Fig. 7 shows a structure of a stopper in the present embodiment, in which (a) is a front view and (b) is a side view.

As shown in fig. 7, thestopper 25 has abase portion 250 and a column portion (pin portion) 251. Thebase portion 250 has a C-ring shape that opens downward when viewed in the front-rear direction, and thebase portion 250 can be attached to thestopper groove 22b of thepiston 22 by deforming thebase portion 250 by enlarging the opening portion. In this manner, thestopper 25 is mounted on thepiston 22 in such a manner as to be relatively rotatable but not movable forward and backward. Thecolumn portion 251 protrudes radially outward from the opposite side of the opening of thebase portion 250, and is fitted into the stopper groove (including the linear stopper groove 113 and the curved stopper groove 110) on the inner peripheral surface of thebarrel portion 11 of theplunger barrel 10 so as to be slidable along the stopper groove.

[ operating hole of limiting block ]

Fig. 13 is a drawing for explaining the structure of the small hole for operating the stopper in the syringe, in which (a) is a drawing obtained when the lower half cylinder portion of the syringe is viewed from the back side, (b) is a drawing obtained when the lower half cylinder portion is viewed from the outside, and (c) is a drawing obtained when the upper half cylinder portion of the syringe is viewed from the outside. In addition, acurved restraint groove 110 is shown in (c).

As shown in fig. 13, the peripheral wall of thebarrel portion 11 of theplunger barrel 10 is provided with a1 stsmall hole 112a and a 2 ndsmall hole 112b which are two small holes penetrating the inside and outside, the position of the 1 stsmall hole 112a in the front-rear direction is substantially the same as the position of the connection between the linear stopper groove 113 and thecurved stopper groove 110, and the position of the 2 ndsmall hole 112b in the front-rear direction is substantially the same as the corner portion between theguide portion 110a and theposition holding portion 110b in thecurved stopper groove 110.

In addition, in the present embodiment, thecurved stopper groove 110 is disposed at one side of the linear stopper groove 113, and the 1st aperture 112a is disposed at the other side of the linear stopper groove 113. The 2 ndsmall hole 112b is provided on a side of thecurved stopper groove 110 away from the linear stopper groove 113 (more specifically, on a side of a corner portion between theguide portion 110a and theposition holding portion 110b away from the linear stopper groove 113).

In the pre-loading operation of pre-loading thecapsule tension ring 200 on theinjector 100, the operator can push the column portion 251 (fig. 7) of thestopper 25 to move in the circumferential direction (i.e., rotate thestopper 25 about the axis in the front-rear direction with respect to the body portion 11) by inserting a needle (needle) into the 1 st or 2nd eyelet 112a or 112 b.

Specifically, the operator inserts the needle into the 1 stsmall hole 112a to push thecolumn portion 251 from the linear stopper groove 113 into thecurved stopper groove 110, and inserts the needle into the 2 ndsmall hole 112a to push thecolumn portion 251 from theguide portion 110a (or from a corner portion between theguide portion 110a and theposition holding portion 110 b) into theposition holding portion 110 b. In other words, in the present embodiment, the movement of thecolumn portion 251 from the linear stopper groove 113 into thecurved stopper groove 110 and the movement of thecolumn portion 251 from theposition holding portion 110b into theguide portion 110a in thecurved stopper groove 110 are performed by the operator pushing thecolumn portion 251 with the needle inserted into the 1 st and 2 ndsmall holes 112a and 112 b.

[ RESET SPRING ]

As shown in fig. 2, thereturn spring 40 is disposed in thebarrel portion 11 of theplunger 10 between the front end portion of thebarrel portion 11 and thepiston 22 of thestem 20, and is attached in a compressed state to apply a rearward urging force to thestem 20. Specifically, the front end of thereturn spring 40 is fitted over thespring positioning projection 31d at the rear end of theplunger connecting portion 31 of theplunger 30, and abuts against therear end surface 31c of theplunger connecting portion 31 from behind; on the other hand, the rear end of thereturn spring 40 is fitted over thespring fixing post 24 of thestem 20 and abuts against the front end surface of thepiston 22 from the front. In this manner, a rearward force is applied to theentire core rod 20 by applying a rearward force to thepiston 22.

[ bolus injection method ]

The following describes a method of injecting thecapsular tension ring 200 into the human eye.

First, the operator removesinjector 100 preloaded withpouch tension ring 200 from the package, as described above, withstem 20 held in the tension ring preloaded position and post 251 ofstopper 25 positioned inposition retaining portion 110b of curved stopper groove 110 (position E). In this state, the operator pushes thethumb grip 27 to move thestem 20 forward, and thecolumn 251 of thestopper 25 moves forward along theposition holding portion 110b by the movement of thestem 20 until it moves to a corner portion (position D) between theposition holding portion 110b and theguide portion 110a and cannot move forward any more, and at this time, thecolumn 251 enters theguide portion 110a at the same time as described above. Then, the operator loosens or relieves the push of thethumb 27, under the action of thereturn spring 40, thecore rod 20 moves backwards to drive the limitingblock 25 to move backwards, thecolumn portion 251 of the limitingblock 25 moves backwards along the guidingportion 110a to reach the connecting portion (position C) of the curved limitinggroove 110 and the linear limiting groove 113, and then the curved limitinggroove 110 enters the linear limiting groove 113, and continues to move backwards along the linear limiting groove 113 until the linear limiting groove 113 is blocked by the rear end wall of the linear limiting groove 113 to stop at the position (position a). At this time, thecore rod 20 reaches the final end position of the stroke.

On the other hand, thepush pin 23 of thecore bar 20 moves backward, drawing thebag tension ring 200 further into theinjection head 20, and when thecore bar 20 reaches the rearmost end position, thebag tension ring 200 is completely drawn into theinjection head 20, and is substantially completely straightened.

Thereafter, the operator inserts the front end portion of theguide tube portion 33 of theinjection head 30 of theinjector 100 into the incision of the affected eye, pushes thethumb grip 27 forward again, and moves thestem 20 forward, and at this time, thecolumn portion 251 of thestopper 25 moves forward along the linear stopper groove 113 until it moves to the foremost end of the linear stopper groove 113 and stops moving. In the process, thepush pin 23 of thecore rod 20 gradually pushes thepouch tension ring 200 out of thepush injection head 30 and into the affected eye.

[ modification 1 ]

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Fig. 15 shows the structure of the core bar according to modification 1.

As shown in fig. 15, in modification 1, thebase portion 24a of thespring fixing post 24 connected to thepiston 22 is formed in a cylindrical shape having no change in the front-rear (axial) outer diameter, and engages with the inner hole of thereturn spring 40, providing a more stable and reliable fixing effect.

[ variation 2 ]

In the above embodiment, the guide bars 20a (guide projections) extending in the front-rear direction are provided on the outer peripheral surfaces of theplunger 21 and theplunger 22, and the guide bars 20a are fitted into theguide grooves 111 on the inner peripheral surface of thebarrel portion 11 of theplunger 10 and are slidable along theguide grooves 111, so that theplunger 21 and theplunger 22 are guided so as to move theentire stem 20 forward and backward, while the stem 20 (particularly, the push pin 23) is prevented from rotating. It is also possible to provide that the inner peripheral surface of thebarrel portion 11 of theplunger 10 is provided with guide strips extending in the front-rear direction, which are fitted in guide grooves on the outer peripheral surfaces of theplunger 21 and thepiston 22 and are slidable along the guide grooves.

[ variation 3 ]

Fig. 16 and 17 show a configuration according to modification 3.

As shown in fig. 16 and 17, in the present modification, two arrow indicators 30b1 and 30b2 are provided on the outer surface of thebolus 30, and are circumferentially opposed to each other, and these two arrow indicators 30b1 and 30b2 are used to indicate the deployment direction of thecapsular tension ring 200. Specifically, in the pre-loaded state, the direction of arrow indicators 30b1, 30b2 coincides with the direction in whichpouch tension ring 200 extends frombolus 30 and bends. This orientation is consistent with the orientation ofpouch tension ring 200 exiting and deploying from thebolus head 30 during bolus injection. By providing such arrow indicators 30b1 and 30b2, the operator can easily confirm the direction in whichbag tension ring 200 is deployed during the pushing operation, and can easily perform the pushing operation.

In the present modification, the arrow indicators 30b1 and 30b2 are formed by protrusions integrally formed on the outer surface of thebolus 30. In addition, as another mode, the printing device may be configured by a printing pattern portion. Also, as another mode, an arrow indicator may be provided on thesyringe 10, however, it is preferable to provide it on thebolus head 30.

Claims (11)

1. A pouch tension loop injector comprising:

a push-injection cylinder;

the injection pushing head is arranged at the front end of the injection pushing barrel;

a core bar which can move back and forth in the injection cylinder and the injection head, characterized in that,

and a core rod movement guide mechanism extending along the movement direction of the core rod relative to the movement of the injection cylinder or the injection head is arranged between the core rod and at least one of the injection cylinder and the injection head.

2. The bladder tension ring injector of claim 1,

the moving position of the core bar in the front-back direction comprises a tension ring preassembly position which enables a part of the bag tension ring to be accommodated in the injection head;

the bladder tension ring injector further comprises a pre-installation position retaining mechanism arranged between the core bar and the injection cylinder for retaining the core bar at the pre-installation position of the tension ring,

the preassembly position retaining mechanism comprises a limiting block arranged on the core rod; a pre-installation position retaining groove arranged on the peripheral wall of the barrel body part of the injection barrel, wherein the core bar is retained at the pre-installation position of the tension ring through the clamping of the limiting block and the pre-installation position retaining groove; the inner peripheral wall of the cylinder body part is also provided with a limit position limiting groove which is connected with the preassembly position retaining groove and is matched with the limiting block to limit the stroke limit position of the core rod,

the pre-load position holding groove and the extreme position restricting groove are formed by bottomed grooves,

the core bar moving guide mechanism is composed of the limiting block, the preassembly position retaining groove and the limit position limiting groove.

3. The bladder tension ring injector of claim 2, wherein said injector barrel is a two-piece structure split in a front-to-rear direction in a plane at the extreme position limiting groove position, said pre-load position retaining groove being integrally formed in one piece of the barrel half.

4. The bladder tension ring injector as claimed in claim 1, wherein a guide groove extending in a front-rear direction is provided on an inner circumferential wall of said injector cylinder, a rear end of said guide groove being open,

the core bar is provided with a guide bar which is embedded in the guide groove and can slide along the guide groove,

the guide groove and the guide strip form the core rod moving guide mechanism.

5. The bladder tension ring injector of claim 1, wherein said core bar is comprised of a thumb grip, a push rod, a piston, a spring retaining post, and a push pin connected in sequence; still including installing one end and piston butt on the spring fixing post, the reset spring of the other end and push syringe head butt.

6. The bladder tension ring injector of claim 5,

the inner peripheral wall of the injection cylinder is provided with a guide groove extending along the front-back direction, the rear end of the guide groove is open,

the core bar is provided with a guide bar which is embedded in the guide groove and can slide along the guide groove,

the guide groove and the guide strip form the core bar moving guide mechanism,

the guide strips are arranged on the outer peripheral surfaces of the push rod and the piston and extend along the front-back direction.

7. The bladder tension ring injector of claim 5, wherein said piston is provided with an O-ring groove for mounting an O-ring.

8. The bladder tension ring injector as claimed in claim 1, wherein the core bar is provided on its outer circumferential surface with reinforcing ribs extending in the front-rear direction; a groove matched with the reinforcing rib is arranged in the push injection head,

the reinforcing ribs and the grooves form the core rod moving guide mechanism.

9. The bladder tension ring injector of claim 8, wherein said core bar has a push pin, and said reinforcing ribs are provided on an outer circumferential surface of said push pin.

10. The bladder tension ring injector of claim 9, wherein said stiffener is provided on an outer peripheral surface of a rear portion of said push pin.

11. The bladder tension ring injector of claim 5 wherein said spring retaining post is cylindrical with a constant outer diameter dimension in an axial direction.

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