Pre-filled Capsule Tension Ring Injector

Abstract

The pre-installed bladder tension ring pusher of the present invention comprises: a pusher barrel (10); a pusher head (30) arranged at the front end of the pusher barrel; a core rod (20) capable of moving back and forth in the pusher barrel; a pre-installed position maintaining mechanism for maintaining the core rod in the tension ring pre-installed position, wherein the core rod comprises: a piston (22) slidably arranged in the pusher barrel; a push pin (23) fixedly connected to the front end of the piston for pushing and pulling the bladder tension ring; a push rod (21) connected to the rear end of the piston in a relatively rotatable manner; the pre-installed position maintaining mechanism comprises a locking pin fixedly arranged on the push rod and a locking groove formed on the peripheral wall of the pusher barrel; the locking pin (213b) can be embedded in the locking groove (11b) by rotating the push rod (21). In this way, the pre-installed state of the tension ring can be maintained by easy operation.

Description

Technical Field

[0001] The invention relates to a pre-installed capsular bag tension ring pusher, which is a minimally invasive surgical instrument capable of pre-installing a capsular bag tension ring and implanting the ring into a human eye. Background Art

[0002] The capsular tension ring is a compressible, open ring typically made of PMMA. Once implanted, it adheres closely to the capsular membrane, maintaining capsular tension, preventing posterior capsule wrinkles, counteracting capsular contraction, and maintaining capsular integrity. Currently, most capsular tension rings are C-shaped components with an opening on the main body and positioning holes at each end. These rings are implanted into the capsular bag using an implanter (pusher) or forceps. They are used to treat congenital lens subluxation, preoperative or intraoperative zonular rupture, zonular fragility, and the risk of capsular contraction, particularly in patients with high myopia.

[0003] Currently, the clinical application of capsular tension rings can effectively improve surgical safety and reduce surgical complications, serving as an auxiliary tool during cataract surgery. Previously, tension rings were primarily used to maintain the capsular bag's tension contour, but are now also required to inhibit the migration of lens epithelial cells into the posterior capsule, preventing postoperative posterior capsule opacification.

[0004] Existing capsular tension ring injectors typically consist of an implant head (injection head) and an injection section. The implant head is a slender, curved, circular tube with an outer diameter of approximately 1.2mm and a wall thickness of approximately 0.2mm. The injection section consists of an injection barrel and a push rod, which contains a filament approximately 0.3mm in diameter. The hooked tip of the filament engages the locating hole of the capsular tension ring to load the tension ring. The entire device is made of medical metal and is reusable. It requires wet heat sterilization before use and cleaning after use.

[0005] The following problems are prone to occur in the bag tension ring injector:

[0006] a. The implant head is in direct contact with the eyeball tissue, and the narrow space of the slender structure makes it difficult to thoroughly clean blood stains, viscoelastic residues, and other residues after use, increasing the risk of secondary infection for patients;

[0007] b. Residues on the inner wall of the implant head often lead to poor push-through of the tension ring, stagnation, or even failure of push-through.

[0008] c. The existing bag tension ring pusher is made by mechanical processing, which requires high processing and assembly precision, high manufacturing cost and difficult maintenance;

[0009] d. Non-preloaded injectors require the capsular tension ring to be loaded into the implant head on-site during surgery. Compared with preloaded capsular tension ring injectors, the operation is cumbersome and increases the number of surgical steps.

[0010] In addition, patent document 1 discloses a pre-installed pouch tension ring pusher, which has a pusher cylinder (70) (the figure markings are quoted as they are in patent document 1, the same below) and a push rod (72) extending into the pusher cylinder (70), and the front end of the pusher cylinder (70) is provided with a guide tube (76), and the pouch tension ring can be accommodated in the guide tube (76); a push pin (54) is fixed to the front end of the push rod (72), and the hook (56) at the front end of the push pin (54) can hook the positioning hole at the end of the pouch tension ring, so that the pouch tension ring can be pulled into the guide tube (76) by moving the push rod (72) backward.

[0011] In addition, an operating button (88) is provided on the push rod (72). The operating button (88) can rotate in the circumferential direction relative to the push rod (72) but cannot move in the axial direction. In addition, a linear limiting groove (92) extending in the axial direction and a curved engaging groove (84) extending laterally from the limiting groove (92) are provided on the injection cylinder (70). The operating button (88) on the push rod (72) cooperates with the limiting groove (92) and the engaging groove (84). When the push rod (72) moves forward and backward, the operating button (88) moves in the limiting groove (92); when the operator moves the operating button (88) into the engaging groove (84), the front and rear position of the push rod (72) is fixed. At this time, only a part of the bladder tension ring is pulled into the guide tube (76) and is maintained in this state. This state is the pre-installed state of the bladder tension ring.

[0012] That is to say, when using the bladder tension ring pusher of patent document 1, in the pre-installed state, only a part of the bladder tension ring is received in the guide tube (76). In this way, compared with the case where the entire bladder tension ring is received in the guide tube (76), irreversible deformation of the bladder tension ring can be minimized.

[0013] However, when using the pre-loaded bladder tension ring pusher described in Patent Document 1, in order to maintain the pre-loaded state of the bladder tension ring, the operator needs to use his fingers to move the operating button. However, since the operating button is small, it is difficult for the operator to operate it accurately and reliably, resulting in poor operability.

[0014] Patent Document 1: JP4248179B2 Summary of the Invention

[0015] In view of this, an object of the present invention is to provide a pre-installed bladder tension ring injector that can be easily operated to maintain a pre-installed state of the tension ring.

[0016] In order to achieve the above-mentioned purpose, the preloaded bladder tension ring pusher of the present invention comprises: a pusher barrel; a pusher head, which is arranged at the front end of the pusher barrel; a core rod, which can move back and forth in the pusher barrel and has a tension ring preloading position in which a part of the bladder tension ring is accommodated in the pusher head; a preloading position holding mechanism, which is used to keep the core rod in the tension ring preloading position, the core rod having a push rod with a rear end exposed outside the pusher barrel, the push rod being able to move back and forth relative to the pusher barrel and being able to rotate around an axis in the front-to-back direction, the preloading position holding mechanism having a locking pin fixedly arranged on the push rod and a locking groove formed on the peripheral wall of the pusher barrel, and the locking pin can be embedded in the locking groove by rotating the push rod.

[0017] With the above structure, since the locking pin is fixed on the push rod, the locking pin can be embedded in the locking groove by rotating the push rod. Therefore, the operator rotates the push rod to keep the core rod in the pre-installed position of the tension ring. In this way, compared with turning a smaller operating button, the operation is easier and the operability is better.

[0018] Preferably, the core rod further comprises: a piston mounted within the injection barrel so as to be slidable forward and backward but not rotatable about a longitudinal axis; and a push member fixedly connected to a front end of the piston for pushing and pulling the bladder tension ring. The push rod is disposed behind the piston so as to be relatively rotatable.

[0019] With the above structure, since the push rod can rotate relative to the piston, the piston will not be affected by the operator's rotation of the push rod and will not rotate, thereby preventing the push injection component connected to the piston from rotating and preventing the bag tension ring connected to the push injection component from twisting.

[0020] Preferably, the push rod and the piston are connected in a manner of moving back and forth as a whole.

[0021] With the above structure, since the push rod and the piston are connected in a manner of moving back and forth as a whole, it has the effect of being easy to disassemble and assemble.

[0022] Preferably, the piston is formed with a receiving groove open on the outer peripheral side, the push rod is provided with a locking portion, the locking portion has a locking body portion and the locking pin extending from the locking body portion to the outer peripheral side, and the locking body portion is engaged with the receiving groove in a manner that it can rotate relative to itself but cannot move relative to itself forward and backward.

[0023] With the above structure, the locking body realizes the connection between the push rod and the piston, which can rotate relative to each other but cannot move forward and backward relative to each other. The locking pin is arranged on the locking body, which can make the structure compact compared with being arranged in other parts.

[0024] Preferably, the engaging body is a ball head.

[0025] With the above structure, the ball head connection structure is used to achieve a connection between the push rod and the piston that allows relative rotation but cannot move back and forth relative to each other. The structure is simple and the action is reliable.

[0026] Preferably, the present invention has a limiting groove extending along the front-to-back direction on the peripheral wall of the injection cylinder, the locking pin can move forward and backward in the limiting groove, and its stroke is limited by the limiting groove, and the locking groove is formed by being recessed laterally from the limiting groove.

[0027] By adopting the above structure, the front and rear travel range of the locking pin is limited by the limiting groove, and then the travel range of the push rod, piston, and injection component (core rod) is limited. That is, the locking pin is not only used to constitute a pre-installed position holding mechanism, but also used to constitute a limiting mechanism for limiting the travel range of the core rod. The structure is compact, simple, and easy to design.

[0028] Preferably, the latching groove is in the shape of a circular hole with a side opening, a larger internal space and a smaller opening.

[0029] By adopting the above structure, the pre-installed state of the bladder tension ring can be maintained with a simple latching groove structure.

[0030] Preferably, in the present invention, the limiting groove and / or the locking groove is a groove penetrating the peripheral wall of the injection cylinder or a groove with a bottom formed on the inner peripheral wall of the injection cylinder.

[0031] When a through groove is used, it is easy to process; when a groove with a bottom is used, it can prevent dust and the like from entering the interior of the injection barrel through the limiting groove and the locking groove to cause pollution.

[0032] Preferably, in the present invention, a push-in groove is formed on the inner peripheral wall of the injection cylinder, the front end of which is connected to the limiting groove and the rear end is open, and the push-in groove is composed of a groove with a bottom.

[0033] With the above structure, since there is a push-in groove with the front end connected to the limit groove and the rear end open, during assembly, the locking pin can be forced into the push-in groove and then embedded in the limit groove by means of a small degree of deformation, which facilitates installation.

[0034] In the present invention, preferably, a guide groove extending in the axial direction is formed on the inner peripheral wall of the injection cylinder, and a guide protrusion is provided on the piston, which is embedded in the guide groove and can slide along the guide groove.

[0035] With the above structure, the guide groove guides the piston to move forward and backward and prevents the piston from rotating.

[0036] The present invention preferably includes a return spring in the injection cylinder that applies force to the piston backward. In addition, a gripping portion may be provided on the injection cylinder, and the gripping portion is composed of a pair of arm-shaped portions or annular portions extending outward from the barrel portion of the injection cylinder. The push rod may be connected to the piston via a snap-fit ​​portion in a manner that allows for relative rotation but not relative forward and backward movement. The snap-fit ​​portion includes a snap-fit ​​body portion and a snap-fit ​​pin extending outward from the snap-fit ​​body portion. The snap-fit ​​body portion is composed of a ball head portion or a cylindrical portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1 is a side view of a pre-loaded bladder tension ring injector according to a specific embodiment.

[0038] Figure 2 for Figure 1 Cross-sectional view along the AA axis.

[0039] Figure 3 Attached are the accompanying drawings of the various components of the bladder tension ring injector, wherein (a) represents the injector barrel (injector body), (b) represents the guide tube, (c) represents the piston, (d) represents the push rod, (e) represents the push needle, and (f) represents the spring.

[0040] Figure 4 The accompanying drawings show the structure of the above-mentioned injection cylinder, wherein (a) is a cross-sectional view cut along the limiting groove, (b) is a cross-sectional view along the CC direction in (a), and (c) is a cross-sectional view along the BB direction in (a).

[0041] Figure 5 : A diagram showing a structure formed by installing a piston and a push pin together, wherein (a) and (b) are oblique views at two different angles, and (c) is a side view. Figure 6 1 is a diagram showing the structure of a push rod, wherein (a) is a side view and (b) is an oblique view.

[0042] Figure 7-Figure 9 FIG is a diagram for illustrating the assembly process of the bladder tension ring pusher, wherein Figure 7 The figure shows the assembly of the return spring and the core rod. Figure 8 The figure shows the assembly of the guide tube and the injection cylinder. Figure 9 The figure shows the assembly of the return spring and the core rod being installed into the assembly of the guide tube and the injection cylinder.

[0043] Figure 10-12 1 is a diagram for illustrating the operation process of pre-installing the bladder tension ring on the bladder tension ring pusher, wherein: Figure 10 The core rod is at the front end. Figure 11 The figure shows the state when the core rod moves in the front-back direction to the tension ring pre-installation position. Figure 12 The core rod is shown held in the tension ring pre-installed position.

[0044] Figure 13 The figures are used to illustrate the surgical operation process of implanting a capsular bag tension ring into the human eye, wherein (a) is a side view of the capsular bag tension ring injector with the capsular bag tension ring completely retracted therein, (b) is a cross-sectional view taken along line AA in (a), and (c) is an enlarged view of point B in (b).

[0045] Figure 14 The figures show the structure of the injection cylinder involved in the modification, wherein (a) and (b) are oblique views at two different angles.

[0046] Figure 15 The drawings show the structure of a push rod according to another modified example, wherein (a) is a side view and (b) is a perspective view.

[0047] Description of Reference Numerals

[0048] 100. Pre-loaded bag tension ring pusher; 10. Pusher cylinder; 11. Main body of pusher cylinder; 11a. Limiting groove; 11b. Positioning groove; 14. Gripping portion; 20. Core rod; 21. Push rod; 213. Engaging portion; 213a. Ball head; 213b. Positioning pin; 22. Piston; 221a. Ball head receiving groove; 23. Push needle (pusher component); 30. Guide tube (pusher head); 40. Return spring. DETAILED DESCRIPTION

[0049] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0050]

Overall structure

[0051] Figure 1 2 is a side view of the pre-loaded bladder tension ring injector involved in this embodiment. Figure 2 for Figure 1 Cross-sectional view along the AA axis. Figure 3 Attached are the accompanying drawings of the various components of the bladder tension ring injector, wherein (a) represents the injector barrel (injector body), (b) represents the guide tube, (c) represents the piston, (d) represents the push rod, (e) represents the push needle, and (f) represents the spring.

[0052] like Figure 1-3As shown, the pre-installed bag tension ring pusher 100 (sometimes referred to as a pusher) mainly comprises a pusher barrel 10, a push rod 21, a piston 22, a push needle 23 (pusher component), a guide tube 30, and a return spring 40. The pusher barrel 10 is the main body of the bag tension ring pusher 100 and is in the shape of a long cylinder. The guide tube 30 as the pusher head is installed at the front end of the pusher barrel. The inner cavity of the guide tube 30 is connected to the inner space of the pusher barrel 10. When the bag tension ring 200 (see FIG. 2 ) is about to be installed, the pusher barrel 10 is connected to the inner space of the pusher barrel 10. Figure 10-12 Before the surgical operation of pushing the capsular bag tension ring into the human eye (e.g., etc.), the capsular bag tension ring is stored in the guide tube 30.

[0053] Furthermore, the interior of the injector barrel 10 is provided with a core rod 20 primarily composed of a push rod 21, a piston 22, and a push pin 23. The core rod 20 is capable of moving forward and backward along the axial direction of the injector barrel 10, and is capable of pushing the capsular tension ring 200 located within the guide tube 30 forward. Specifically, a piston 22 is mounted at the front end of the push rod 21, and a push pin 23 is mounted at the front end of the piston 22. During surgery, the operator pushes the push rod 21 forward, causing the piston 22 to slide forward along the inner wall surface of the main body 11 of the injector barrel 10, thereby driving the push pin 23 forward. The push pin 23 pushes the capsular tension ring 200 located within the guide tube 30 forward, thereby performing the surgical operation of implanting the capsular tension ring 200 into the human eye.

[0054] In addition, a return spring 40 is provided between the core rod 20 and the injection cylinder 10. The return spring 40 applies a backward force to the core rod 20. When the operator pushes the core rod 20 forward, the force of the return spring 40 needs to be overcome. When the operator releases the force on the core rod 20, the core rod 20 moves backward (resets) under the action of the return spring 40.

[0055] In the preloaded pouch tension ring injector 100 of the present invention, the core rod 20 has three positions within the range of travel in the front-to-back direction, the frontmost position, the rearmost position and the tension ring pre-installed position located therebetween. At the frontmost position, the push pin 23 described later extends out of the guide tube 30. At this position, the pouch tension ring 200 can either be hung on the push pin 23 by the operator, or the push pin 23 pushes the pouch tension ring 200 completely out of the guide tube 30; at the rearmost position, it is either the initial state of the pouch tension ring injector 100 after assembly, or the pouch tension ring 200 is completely pulled into the guide tube 30 (injection head) by the push pin 23 and is about to be operated on; at the tension ring pre-installed position, the push pin 23 pulls a portion of the pouch tension ring 200 into the guide tube 30.

[0056] In particular, in order to maintain the core rod 20 at the tension ring pre-installed position, the bladder tension ring pusher 100 of the present invention has a pre-installed position maintaining mechanism, which will be described in detail later.

[0057] The following is a detailed description of each component of the bladder tension ring injector 100.

[0058] As can be seen from the above, in this specification, the direction in which the bag tension ring 200 is pushed out of the injector 100 is defined as forward, and the opposite direction is defined as rearward. Furthermore, in this embodiment, the forward and backward direction coincides with the axial direction of the injector barrel 10, which serves as the main body of the injector. Furthermore, unless otherwise specified, the "circumferential direction" described in this embodiment coincides with the circumferential direction of the injector barrel 10, and the "radial direction" coincides with the radial direction (outer circumference-inner circumference direction) of the injector barrel 10.

[0059]

Injection Cylinder

[0060] Figure 4 The accompanying drawings show the structure of the above-mentioned injection cylinder, wherein (a) is a cross-sectional view cut along the limiting groove, (b) is a cross-sectional view along the CC direction in (a), and (c) is a cross-sectional view along the BB direction in (a).

[0061] like Figure 3 Middle (d), Figure 4 As shown, the injection cylinder 10 has a cylindrical main body 11 , a tapered transition portion 12 formed at the front end of the main body 11 , and a guide tube connecting portion 13 formed at the front end of the tapered transition portion 12 and having a smaller diameter than the main body 11 .

[0062] Furthermore, a pair of gripping portions 14 extending radially outward are formed on the outer circumference of the main body 11. The pair of gripping portions 14 are arranged opposite each other and are formed as arms that extend radially outward and tilt forward, with a certain arc. During operation, the operator (doctor) can hold the main body 11 between their index and middle fingers, with their index and middle fingers respectively gripping the pair of gripping portions 14. Meanwhile, the operator's thumbs press on a push handle (thumb handle) 212 at the rear end of the push rod 21, which will be described later, thereby pushing the push rod 21 forward with their thumbs.

[0063] In this embodiment, the injection cylinder 10 is an integrally formed component, that is, the main body 11 , the tapered transition portion 12 , the guide tube 30 and the gripping portion 14 are integrally formed.

[0064] In addition, a limiting groove 11a and a retaining groove 11b are provided on the inner circumferential wall of the main body 11, both of which penetrate the inner circumferential wall of the main body 11. The limiting groove 11a extends linearly along the axial direction of the main body 11, and the retaining groove 11b is formed by being recessed from a predetermined position in the axial direction of the limiting groove 11a to one side in the circumferential direction (or recessed to the side of the limiting groove 11a). It is generally in the shape of a circular hole with an opening, with a larger internal space, a smaller opening, and a blunt edge. The limiting groove 11a and the retaining groove 11b are primarily used to limit and determine the axial position of the core rod 20, and will be described in detail later.

[0065] A push-in groove 11c and a guide groove 11d are also provided on the inner circumferential wall of the main body 11. Both are bottomed grooves and do not penetrate the inner circumferential wall of the main body 11. The push-in groove 11c is connected to the rear end of the limiting groove 11a, extends in a straight line, and extends to the rear end surface of the main body 11, that is, the rear end of the push-in groove 11c is open. The guide groove 11d extends in a straight line along the axial direction, is parallel to the limiting groove 11a, has a square cross-section, is open at the rear end (open), and extends to a position forward of the front end of the limiting groove 11a. In addition, in this embodiment, the guide groove 11d is arranged at a position opposite to the limiting groove 11a.

[0066]

Core rod 20

[0067] Figure 5 : A diagram showing a structure formed by installing a piston and a push pin together, wherein (a) and (b) are oblique views at two different angles, and (c) is a side view. Figure 6 1 is a diagram showing the structure of a push rod, wherein (a) is a side view and (b) is an oblique view.

[0068] As described above, the core rod 20 includes the push rod 21 , the piston 22 , and the push pin 23 .

[0069] <Piston>

[0070] like Figure 3 (c) Figure 5 As shown, the piston 22 includes a main body portion 221 that is cylindrical in shape as a whole and a push pin connecting portion 222 that is formed at the front end of the main body portion 221 and has a cylindrical shape and a smaller diameter than the main body portion 221 .

[0071] Two annular grooves 221c are provided on the outer circumference of the main body 221. The grooves 221c are used to install the O-rings 24 ( Figure 7 、 Figure 9 ).

[0072] Furthermore, a ball head receiving groove 221a and a connecting groove 221b are provided at the rear end of the main body 221. Both grooves are open cylindrical grooves that open radially outward. The connecting groove 221b extends from the ball head receiving groove 221a to the rear end surface of the main body 221, i.e., the rear end opening of the connecting groove 221b. Furthermore, the radial dimension of the connecting groove 221b is smaller than that of the ball head receiving groove 221a, thereby forming a step between the two. This step prevents the ball head 213a of the push rod 21, described later, from disengaging from the ball head receiving groove 221a. This allows the push rod 21 and the piston 22 to maintain axial movement as one unit.

[0073] A guide rib 223 (an example of a guide protrusion) protruding radially outward is provided on the outer peripheral surface of the front part of the main body 221. The cross-section of the guide rib 223 is roughly square, and it is embedded in the guide groove 11d on the inner wall surface of the main body 11 of the above-mentioned injection cylinder 10, and slides back and forth along the guide groove 11d. The cooperation between the guide groove 11d and the guide rib 223 guides the forward and backward movement of the piston 22, and also has the function of preventing the piston 22 from rotating relative to the injection cylinder 10.

[0074] <Push Pin>

[0075] In addition, a push pin (filament) 23 is fixedly mounted on the push pin connection portion 222 of the piston 22 by insert molding. Figure 3 As shown in (e), the push pin 23 has an elongated main body 231, a bent tail portion 232, and a front end 233 with a hook portion 233a. The tail portion 232 is fixed to the push pin connecting portion 222. The hook portion 233a of the front end 233 is used to hook the positioning hole at one end of the bag tension ring 200.

[0076] <Putter>

[0077] like Figure 6 As shown, the push rod 21 is an integral component comprising an elongated main body 211, a push handle (thumb handle) 212 formed at the rear end of the main body 211, and a snap-fit ​​portion 213 formed at the front end of the main body 211. The main body 211 has a cross-shaped cross-section. The push handle 212 is located outside the main body 11 of the injection cylinder 10. When viewed axially, the push handle 212 has a larger area than the main body 211, making it easier for an operator, for example, to push and press the push handle 212 with their thumb.

[0078] The engaging portion 213 includes a neck portion 213c extending forward from the center of the front end surface of the main body 211, a ball head portion 213a (engaging the main body portion) formed at the front end of the neck portion 213c, and a locking pin 213b extending radially outward from the ball head portion 213a. The ball head portion 213a is inserted into a ball head receiving groove 221a in the main body 221 of the piston 22 and is rotatable therein (centered on the axis in the forward and backward directions). Furthermore, in this position, the neck portion 213c is located in the connecting groove 221b of the main body 221 of the piston 22. The locking pin 213b is inserted into a retaining groove 11a on the peripheral wall of the main body 11 of the injection cylinder 10 and is movable forward and backward along the retaining groove 11a. The range of its movement is limited by the front-to-back length of the retaining groove 11a. Furthermore, the retaining pin 213b can also be inserted into a retaining groove 11b connected to the retaining groove 11a. In this embodiment, the retaining groove 11a maintains the retaining pin 213b securely in place therein with a certain clamping force. In this embodiment, the retaining pin 213b and the retaining groove 11b constitute a pre-installed position retaining mechanism for retaining the core rod 20 in the pre-installed position of the bladder tension ring. At the same time, the retaining pin 213b and the retaining groove 11a constitute a limiting mechanism for limiting the travel range of the core rod 20.

[0079] As described above, the ball head 213a of the engaging portion 213 of the push rod 21 is rotatably engaged in the ball head receiving groove 221a of the piston 22, so that the push rod 21 can rotate relative to the piston 22 (within a certain range) around the axis in the forward and backward directions.

[0080]

Guide tube and return spring

[0081] like Figure 2 、 3 As shown, the guide tube 30 is a slender tube with a slightly curved front portion, which is inserted into the guide tube connecting portion 13 of the injection cylinder 10 and fixed thereto by bonding. Figure 2 、 3 As shown, the spring 40 is disposed within the injection cylinder 10, combined with Figure 4 A rearward-facing abutment surface 12a is formed within the tapered transition portion 12 of the injection cylinder 10, and the front end of the spring 40 abuts against this abutment surface 12a. Furthermore, the rear portion of the spring 40 is sheathed over the push-pin connection portion 222 of the piston 22, with its rear end abutting against the front end surface of the main body 221 of the piston 22. In other words, the spring 40 is installed in a compressed state between the abutment surface 12a on the injection cylinder 10 side and the main body 221 of the piston 22 of the core rod 20, exerting a rearward force on the core rod 20.

[0082]

Assembly method of the bag tension ring injector

[0083] Figure 7-Figure 9The figure is used to illustrate the assembly process of the bladder tension ring injector.

[0084] like Figure 7 As shown, two O-rings 24 are embedded in the annular groove 221c of the main body 221 of the piston 22. Afterwards, the spring 40 is sleeved on the push pin connecting portion 222 of the piston 22, and its rear end abuts against the front end face of the main body 221 of the piston 22.

[0085] like Figure 7 As shown, the engaging portion 213 of the push rod 21 is engaged with the rear end of the piston 22 with the push pin 23, specifically, the ball head 213a is embedded into the ball head receiving groove 221a from the radial outside to the inside. In this state, the end of the locking pin 213b on the ball head 213a extending radially outward exceeds the main body 221 of the piston 22.

[0086] On the other hand, Figure 8 As shown, the guide tube 30 is inserted into the guide tube connection portion 13 of the injection cartridge 10 and fixed by adhesive.

[0087] Afterwards, if Figure 9 As shown, Figure 7 The assembled core rod 20 and spring 40 assembly is inserted into the rear portion of the main body 11 of the injection cylinder 10 with the push pin 23 facing forward. During installation, the circumferential position of the retaining pin 213b on the push rod 21 aligns with the retaining groove 11a and the insertion groove 11c on the injection cylinder 10, and the circumferential position of the guide rib 223 on the piston 22 aligns with the guide groove 11d on the injection cylinder 10. The core rod 20 and spring 40 assembly is then moved forward relative to the injection cylinder 10. The retaining pin 213b on the push rod 21, with minimal deformation, is forced into the insertion groove 11c and then into the retaining groove 11a connected to the front end of the insertion groove 11c. Furthermore, the guide rib 223 on the piston 22 enters the guide groove 11d on the injection cylinder 10. After the installation is completed, under the action of the return spring 40, the core rod 20 is located at the rearmost position of its travel range, that is, the locking pin 213b is located at the rearmost end of the limiting groove 11a. This state can be seen in FIG. Figure 1 、 Figure 2 .

[0088] [Pre-installation method of the capsular tension ring]

[0089] Figure 10-12 The figure is used to illustrate the operation process of pre-installing the bladder tension ring on the bladder tension ring injector.

[0090] In order to realize the pre-installation of the bag tension ring 200 on the pusher 100, as shown in FIG. Figure 10 As shown, the operator Figure 1 、2 In the state shown, the push rod 21 is pushed forward, so that the locking pin 213b moves to the front end of the limiting groove 11a. At this time, the core rod 20 moves to the front end position of its stroke. In this state, the front end of the push pin 23 extends out of the guide tube 30. The operator hangs the bag tension ring 200 on the push pin 23, specifically, the hook portion 233a ( Figure 3 ) hooks the positioning hole at one end of the bladder tension ring 200.

[0091] After that, the operator slightly reduces the thrust on the push rod 21. Under the action of the return spring 40, the piston 22 drives the push rod 21 and the push pin 23 to move backward. The front end of the push pin 23 gradually retreats into the guide tube 30, gradually pulling the bag tension ring 200 into the guide tube 30. When the push rod 21 retreats to the point where the front-to-back position of the locking pin 213b is consistent with the position of the locking groove 11b, see Figure 11 , so that the push rod 21 (core rod 20) stops retreating, and as Figure 11 As shown by the arrow in FIG, the push rod 21 is rotated, so that the locking pin 213b on the push rod 21 moves in the circumferential direction and is embedded in the locking groove 11b. By the engagement of the locking pin 213b with the locking groove 11b, the front and rear positions of the push rod 21 (core rod 20) are maintained (fixed). This state is as shown in FIG. Figure 12 And, in this state, as Figure 12 As shown, only a small portion of the bladder tension ring 200 is pulled into the guide tube 30 , and therefore, only a small portion of the bladder tension ring 200 is deformed by the action of the guide tube 30 .

[0092] Through the above operations, the bladder tension ring 200 is pre-installed on the bladder tension ring pusher 100. In such a pre-installed state, the bladder tension ring 200 and the bladder tension ring pusher 100 are shipped as one product.

[0093] [Implantation method of capsular tension ring]

[0094] Figure 13 The figures are used to illustrate the surgical operation process of implanting a capsular bag tension ring into the human eye, wherein (a) is a side view of the capsular bag tension ring injector with the capsular bag tension ring completely retracted therein, (b) is a cross-sectional view taken along line AA in (a), and (c) is an enlarged view of point B in (b).

[0095] To implant the capsular tension ring 200 into the affected eye, first, the operator Figure 12 As shown by the arrow in FIG, the push rod 21 is rotated, so that the locking pin 213b on the push rod 21 moves in the circumferential direction and disengages from the locking groove 11b. Figure 13As shown, under the action of the return spring 40, the core rod 20 moves backward, and the push pin 23 pulls the bag tension ring 200 further into the guide tube 30 until the locking pin 213b moves to the rear end of the limiting groove 11a. At this time, the bag tension ring 200 has been completely pulled into the guide tube 30. In addition, in this state, as Figure 13 As shown, the bladder tension ring 200 is substantially extended along the direction of the guide tube 30 due to elastic deformation.

[0096] Afterwards, the operator pushes the push rod 21 forward, and the push needle 23 gradually pushes the capsular tension ring 200 out of the guide tube 30 and implants it into the affected eye through the incision on the affected eye. In the process of gradually entering the affected eye, the elastic deformation of the capsular tension ring 200 gradually recovers, and it can play a role in supporting the capsular bag and resisting capsular bag contraction.

[0097] During the above-mentioned pre-installation operation and implantation operation (surgery) of the capsular tension ring 200, the locking pin 213b on it is embedded in or disengaged from the locking groove 11b by rotating the push rod 21. During this process, as mentioned above, since the push rod 21 is rotatable relative to the piston 22, in the core rod 20, although the push rod 21 rotates, the piston 22 does not rotate, and thus the push pin 23 does not rotate, so that the hook portion 233a of the push pin 23 maintains a specified direction to prevent the capsular tension ring 200 from being twisted.

[0098] [Effects of this embodiment]

[0099] According to the present embodiment, the pre-installed bag tension ring pusher 100 comprises: a pusher barrel 10; a pusher head composed of a guide tube 30, which is arranged at the front end of the pusher barrel 10; a core rod 20, which can move back and forth in the pusher barrel 10 and has a tension ring pre-installed position in which a part of the bag tension ring 200 is accommodated in the guide tube 30; a pre-installed position holding mechanism composed of a positioning groove 11b and a positioning pin 213b, which is used to keep the core rod 20 in the tension ring pre-installed position. There are: a piston 22, which is slidably arranged in the injection cylinder 10; a push pin 23, which is fixedly connected to the front end of the piston 22 and is used to push and pull the bag tension ring 200; a push rod 21, which is connected to the rear end of the piston 22 in a relatively rotatable manner, and a locking pin 213b is integrally fixed to the push rod 21, and a locking groove 11b is formed on the peripheral wall of the main body 11 of the injection cylinder 10. By rotating the push rod 21, the locking pin 213b can be moved in the circumferential direction and embedded in the locking groove 11b.

[0100] Therefore, the operator can operate the push rod 21 to keep the core rod 20 in the tension ring pre-installed position, so that the pouch tension ring injector 100 maintains the tension ring pre-installed state. In this way, compared with the method of turning a smaller operating button, the operation is easier and the operability is better.

[0101] In addition, since the push rod 21 can rotate relative to the piston 22, the piston 22 will not be affected by the operator's rotation of the push rod 21 and will not rotate, thereby preventing the push pin 23 connected to the piston 22 from rotating and preventing the bladder tension ring 200 connected to the push pin 23 from torsional deformation.

[0102] In this embodiment, the push rod 21 and the piston 22 are connected in a manner of moving back and forth as a whole, thereby facilitating assembly and disassembly.

[0103] In this embodiment, a ball head receiving groove 221a open on the outer peripheral side is formed on the piston 22, and a locking portion 213 is provided on the push rod 21. The locking portion 213 has a ball head portion 213a as a locking body portion and a locking pin 213b extending from the ball head portion 213a to the outer peripheral side. The ball head portion 213a is embedded in the ball head receiving groove 221a in a manner that it can rotate relative to itself but cannot move forward and backward relative to itself.

[0104] Adopting the above structure, because the blocking pin 213b is arranged on the ball head 213a, it can make the structure compact compared with being arranged at other positions.In addition, the connection between the push rod 21 and the piston 22 that can rotate relative to each other but cannot move forward and backward relative to each other is realized by the ball head connection structure, which has a simple structure and reliable operation.

[0105] Furthermore, in this embodiment, a retaining groove 11a extending in the front-to-back direction is provided on the peripheral wall of the main body 11 of the injection cylinder 10. The retaining pin 213b is capable of forward and backward movement within the retaining groove 11a. The retaining groove 11b is formed by being recessed laterally from the retaining groove 11a. Thus, the retaining groove 11a defines the forward and backward travel range of the retaining pin 213b, thereby defining the travel range of the push rod 21, piston 22, and push pin 23 (core rod 20). In other words, the retaining pin 213b not only constitutes a pre-installed position-maintaining mechanism, but also serves as a limiting mechanism for limiting the travel range of the core rod 20. This results in a compact, simple, and easy-to-design structure.

[0106] In this embodiment, the retaining groove 11b is substantially in the shape of a circular hole with a side opening, a larger internal space and a smaller opening. Therefore, the pre-installed state of the bladder tension ring can be maintained with a simple retaining groove structure.

[0107] In this embodiment, the limiting groove 11a and the locking groove 11b are grooves that pass through the peripheral wall of the main body 11 of the injection cylinder 10, thereby facilitating processing.

[0108] In addition, in this embodiment, a push-in groove 11c is formed on the inner circumferential wall of the main body 11 of the injection cylinder 10, the front end of which is connected to the limiting groove 11a and the rear end is open. The push-in groove 11c is composed of a groove with a bottom. Therefore, during assembly, the locking pin 213b can be forced to be pushed into the push-in groove 11c with the help of a small degree of deformation and then moved forward to be embedded in the limiting groove 11a, which facilitates installation.

[0109] In addition, in this embodiment, a guide groove 11d extending axially is formed on the inner circumferential wall of the main body 11 of the injection cylinder 10, and a guide protrusion 223 is provided on the piston 22, which is embedded in the guide groove 11d and can slide along the guide groove 11d, so that the guide groove 11d can guide the piston 22 to move back and forth and prevent the piston 22 from rotating.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0111] For example, the present invention may also adopt the following modified examples.

[0112] [Variation]

[0113] Figure 14 The figures show the structure of the injection cylinder involved in the modification, wherein (a) and (b) are oblique views at two different angles.

[0114] In the above embodiment, the gripping portion 14 of the injection cylinder 10 has a shape extending obliquely backward, however, the present invention is not limited thereto. For example, Figure 14 As shown, the plunger 10 has two annular gripping portions 14A.

[0115] Figure 15 The drawings show the structure of a push rod according to another modified example, wherein (a) is a side view and (b) is a perspective view.

[0116] In the above embodiment, the engaging body of the engaging portion 213 at the front end of the push rod 21 is composed of the ball head 213a. However, the present invention is not limited thereto. Figure 15 As shown, the engaging portion 213 includes a cylindrical engaging body portion 213a'. Furthermore, other arrangements can be used to connect the push rod 21 and piston 22 so that they can rotate relative to each other but cannot move forward and backward. Furthermore, since the push rod 21 can push the piston 22 forward, and the piston 22 moves backward via the return spring 40, the push rod 21 and piston 22 do not need to be connected in a manner that allows for integrated forward and backward movement.

[0117] In addition, in the above embodiment, the limiting groove 11a and the locking groove 11b are composed of through grooves. However, the present invention is not limited to this. For example, the limiting groove 11a and the locking groove 11b can also be bottomed grooves (non-through grooves) formed on the inner peripheral wall of the main body 11 of the injection cylinder 10.

[0118] In addition, in the above embodiment, the conical transition portion 12 and the guide tube connecting portion 13 are integrally formed on the main body 11 of the injection cylinder 10. However, the conical transition portion 12 and the guide tube connecting portion 13 can be formed independently of the main body 11 of the injection cylinder 10 and then installed on the main body 11 of the injection cylinder 10.

[0119] In the above embodiment, the forward and rearward positions of the core rod 20 are achieved by limiting the travel of the push rod 21 via the limiting groove 11a connected to the retaining groove 11b. However, the present invention is not limited to this. For example, the guide groove 11d can be replaced with a groove that functions as a front and rear limiter, thereby limiting the travel range of the piston 22 and achieving the aforementioned forward and rearward positions. In this case, the limiting groove 11a connected to the retaining groove 11b can be replaced with a longer groove, with its rear end open.

[0120] Furthermore, in the above embodiment, the engaging portion 213 is provided on the push rod 21 , but the engaging portion may also be provided on the piston.

Claims

1. A pre-loaded bladder tension ring injector having: Push cylinder; an injection head, which is arranged at the front end of the injection cylinder; a core rod capable of moving back and forth within the ram and having a tension ring pre-installed position for receiving a portion of the bladder tension ring within the ram; A pre-installed position holding mechanism, which is used to keep the core rod in the pre-installed position of the tension ring, It is characterized in that The core rod has a push rod, a piston and a push component. The rear end of the push rod is exposed outside the push cylinder. The push rod can move forward and backward relative to the push cylinder and can rotate around the axis in the front-back direction. The piston is installed inside the push cylinder in a manner that it can slide forward and backward but cannot rotate around the axis in the front-back direction. The push component is fixedly connected to the front end of the piston and is used to push and pull the bag tension ring. The push rod is arranged behind the piston in a manner that it can rotate relative to the piston and thus can rotate relative to the push component. The pre-installed position holding mechanism has a locking groove and a locking pin. The locking groove is formed on the peripheral wall of the injection cylinder. The locking pin is fixedly arranged on the push rod and cannot rotate relative to the push rod or move forward and backward. Therefore, the locking pin can be embedded in the locking groove by rotating the push rod.

2. The pre-loaded bladder tension ring injector according to claim 1, characterized in that: A guide groove (11d) extending in the axial direction is formed on the inner peripheral wall of the injection cylinder, and a guide protrusion (223) embedded in the guide groove and capable of sliding along the guide groove is provided on the piston, so that the guide groove (11d) can guide the piston to move forward and backward and prevent the piston from rotating.

3. The pre-loaded bladder tension ring injector according to claim 2, characterized in that: The push rod is connected to the piston in a manner of moving back and forth as a whole.

4. The pre-loaded bladder tension ring injector according to claim 3, characterized in that: The piston is formed with a receiving groove with an open outer peripheral side. The push rod has a main body and a locking portion, the locking portion has a locking body and the locking pin extending from the locking body to the outer peripheral side, and the locking body is engaged in the receiving groove in a manner that it can rotate relatively but cannot move forward and backward relatively.

5. The pre-loaded bladder tension ring injector according to claim 4, characterized in that: A connecting groove (221b) is also provided on the piston. The connecting groove is formed from the receiving groove to the rear end surface of the piston. The radial dimension of the connecting groove is smaller than that of the receiving groove, thereby forming a step portion between the two. The communication groove (221b) is open toward the outer peripheral side.

6. The pre-loaded bladder tension ring injector according to claim 4, characterized in that: The cross section of the main body of the push rod is cross-shaped. The locking pin is integrally fixed to the main body of the push rod.

7. The pre-loaded bladder tension ring injector according to claim 4, characterized in that: A circular groove (221c) is formed on the outer peripheral surface of the piston. The groove (221c) is located in front of the receiving groove.

8. The pre-filled bladder tension ring injector according to any one of claims 1 to 4, characterized in that: A limiting groove extending along the front-to-back direction is provided on the peripheral wall of the injection cylinder. The locking pin can move forward and backward in the limiting groove, and its stroke is limited by the limiting groove. The locking groove is formed by being recessed to the side from the limiting groove.

9. The pre-loaded bladder tension ring injector according to claim 8, characterized in that: The locking groove (11b) is roughly in the shape of a circular hole with a side opening.

10. The pre-filled bladder tension ring injector according to claim 8, characterized in that: The locking slot is generally in the shape of a circular hole with a side opening, a larger internal space and a smaller opening.

11. The pre-filled bladder tension ring injector according to claim 8, characterized in that: The limiting groove and / or the locking groove is a groove that passes through the peripheral wall of the injection cylinder or a groove with a bottom formed on the inner peripheral wall of the injection cylinder.

12. The pre-filled bladder tension ring injector according to claim 11, characterized in that: A push-in groove is formed on the inner peripheral wall of the injection cylinder, the front end of which is connected to the limiting groove and the rear end is open. The push-in groove is composed of a groove with a bottom.

13. The pre-filled bladder tension ring injector according to any one of claims 2 to 7, characterized in that: A guide groove extending in the axial direction is formed on the inner peripheral wall of the injection cylinder, and a guide protrusion is provided on the piston, which is embedded in the guide groove and can slide along the guide groove.

14. The pre-filled bladder tension ring injector according to any one of claims 2 to 7, characterized in that: A return spring is provided in the injection cylinder to apply force to the piston backward. The injection cylinder is provided with a gripping portion, which is composed of a pair of arm-shaped portions or ring-shaped portions extending outward from the cylinder body of the injection cylinder. The push rod is connected to the piston through a locking portion in a manner that allows relative rotation but not relative forward and backward movement. The locking portion includes a locking body portion and a locking pin extending from the locking body portion to the outer peripheral side. The locking body portion is composed of a spherical head portion or a cylindrical portion.

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