Pre-installed bladder bag tension ring pusher, pre-installed bladder bag tension ring and bladder bag tension ring pre-installation method

Abstract

The present invention provides a pre-installed bladder tension ring pusher, which comprises: a pusher barrel (10); a pusher head (30), which is arranged at the front end of the pusher barrel; a core rod (20), which can move forward and backward in the pusher barrel, and has a tension ring pre-installed position in which a part of the bladder tension ring is stored in the pusher head, a limit block (25) is arranged on the core rod, and a pre-installed position retaining groove (110) is arranged on the peripheral wall of the barrel body of the pusher barrel, and the core rod is retained in the tension ring pre-installed position by the engagement of the limit block with the pre-installed position retaining groove, and the pre-installed position retaining groove is composed of a bottomed groove arranged on the inner peripheral wall of the barrel body. The above structure can prevent dust and the like from entering the interior of the pusher barrel and causing pollution.

Description

Technical Field

[0001] The present 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 it into a human eye. In addition, the present invention also relates to a pre-installed capsular bag tension ring and a capsular bag tension ring pre-installation method. Background Art

[0002] The capsular tension ring is a compressible open ring, usually made of PMMA material. After being implanted in the capsular bag, it adheres closely to the capsular membrane, which can maintain the tension of the capsular bag, prevent the posterior capsule from wrinkling, resist the contraction of the capsular bag, and maintain the integrity of the capsular bag. Currently, most capsular tension rings are C-shaped parts with an opening on the main body, with positioning holes at both ends. They are implanted into the capsular bag through an implanter (injector) or implantation forceps, and are used for congenital lens subluxation, preoperative or intraoperative suspensory ligament rupture, suspensory ligament fragility, and patients with the risk of capsular shrinkage, especially those with high myopia.

[0003] At present, the clinical application of capsular tension ring can effectively improve the safety of surgery, reduce complications caused by surgery, and can be used as an auxiliary tool during cataract surgery. In the past, the tension ring was mainly used to maintain the tension contour of the capsular bag, but now it is further required to inhibit the migration of lens epithelial cells to the posterior capsule to prevent postoperative posterior capsule opacification.

[0004] The existing capsule tension ring pusher generally consists of an implant head (push head) and a push part. The implant head is a slender circular tube with a certain curvature, with an outer diameter of about 1.2mm and a wall thickness of about 0.2mm. The push part consists of a push tube and a push rod, which contains a filament with a diameter of about 0.3mm. The front end of the filament is hook-shaped, which is used to cooperate with the positioning hole of the capsule tension ring to load the tension ring. The whole product is made of medical metal materials and is reusable. It needs to be sterilized by wet heat before use and needs to be cleaned after use.

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

[0006] a. The implant head is in direct contact with the eyeball tissue, and the elongated structure has narrow space. It is difficult to thoroughly clean blood stains, viscoelastic agent and other residues after use, which increases the risk of secondary infection for patients;

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

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

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

[0010] In addition, patent document 1 discloses a preloaded bladder tension ring pusher, which comprises 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), the front end of the pusher cylinder (70) is provided with a guide tube (76) serving as a pusher head, and the bladder 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 a hook portion (56) at the front end of the push pin (54) can hook the positioning hole at the end of the bladder tension ring, so that the bladder 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), and 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 pushes the operating button (88) into the engaging groove (84), the front and rear position of the push rod (72) is fixed, and at this time, only a part of the bladder tension ring is pulled into the guide tube (76) and is maintained in this state, which is the pre-installed state of the bladder tension ring.

[0012] That is to say, when using the bladder tension ring injector of Patent Document 1, in the pre-installed state, only a portion 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-installed bag tension ring described in Patent Document 1, since the limit groove (92) and the engaging groove (84) are through-hole structures, once the tension ring pre-installed on the pusher is implanted in the human eye, the operator can easily turn the operating button (88) to use the pusher again, which can easily lead to the secondary use of disposable medical devices, thereby posing a safety hazard. In addition, in the pre-installed bag tension ring pusher described in Patent Document 1, in order to form the limit groove (92) and the engaging groove (84), a through long hole is opened on the peripheral wall of the pusher barrel (70), so there is a certain risk that dust and the like may enter the inside of the pusher barrel (70) through the through long hole, causing pollution.

[0014] Patent document 1: JP4248179B2 Summary of the invention

[0015] In view of this, an object of the present invention is to provide a preloaded bladder tension ring pusher capable of preventing secondary use, a preloaded bladder tension ring having the bladder tension ring pusher, and a bladder tension ring preloading method.

[0016] In order to achieve the above-mentioned purpose, the preloaded bladder tension ring pusher of the present invention is constructed as follows: a pusher barrel; a pusher head, which is arranged at the front end of the pusher barrel; a core rod, which can move forward and backward 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 limiting block is arranged on the core rod, and a preloading position retaining groove is arranged on the inner wall of the barrel portion of the pusher barrel, the core rod is maintained in the tension ring preloading position by the engagement of the limiting block and the preloading position retaining groove, and the preloading position retaining groove is composed of a bottomed groove arranged on the inner circumferential wall of the barrel portion.

[0017] With the above structure, since the pre-installed position holding groove is formed by a bottomed groove arranged on the inner peripheral wall of the barrel, compared with the pre-installed position holding groove being formed by a through groove penetrating the barrel of the pusher, dust and the like are prevented from entering the interior of the pusher through the through groove to cause pollution. In addition, since the pre-installed position holding groove is formed by a bottomed groove, it is difficult or impossible for the operator to perform relevant operations on the limit block to restore the pusher to the pre-installed state, avoiding the pusher from being used again, which significantly reduces safety hazards.

[0018] Preferably, in the present invention, a through hole is provided on the peripheral wall of the cylindrical portion, and the small hole can allow a thin object to penetrate therein and push the limit block.

[0019] With the above structure, since a small hole is provided to allow a thin object to penetrate and push the limit block, the limit block can be easily brought to a position where it engages with the pre-installed position holding groove.

[0020] Preferably, the inner circumferential wall of the barrel portion is further provided with an extreme position limiting groove which is connected to the pre-installed position retaining groove and limits the stroke extreme position of the core rod by cooperating with the limit block, and the extreme position limiting groove is composed of a bottomed groove.

[0021] With the above structure, since the limit position limiting groove is composed of a bottomed groove, compared with a through groove, it has the technical effect of being able to suppress dust from entering the injection cylinder and causing pollution.

[0022] Preferably, the injection cylinder is a two-half structure split along the front-rear direction, including a first half-cylinder portion and a second half-cylinder portion, and the pre-installed position retaining groove is integrally formed on the first half-cylinder portion.

[0023] According to the above structure, since the pre-installation position holding groove is formed entirely on the first semi-cylindrical portion, the pre-installation position holding groove can be formed easily and accurately.

[0024] Preferably, in the present invention, the extreme position limiting groove is in a straight line extending in the front-rear direction, a part of which is formed on the first semi-cylindrical portion, and another part of which is formed on the second semi-cylindrical portion.

[0025] In addition, the present invention preferably comprises a guide portion and a position retaining portion, wherein the guide portion extends from the extreme position limiting groove to one side in the circumferential direction and obliquely toward the front side, and the position retaining portion folds back from the front end of the guide portion and extends to one side in the circumferential direction and obliquely toward the rear side, forming a corner portion therebetween.

[0026] With the above structure, the limit block first passes through the corner portion and then moves to the position holding portion, so that it can be reliably held in the position holding portion, so that the bladder tension ring can be reliably preinstalled on the preinstalled bladder tension ring injector.

[0027] Preferably, the small hole comprises a first small hole and a second small hole, the first small hole being arranged at a position corresponding to the connecting portion of the pre-installed position retaining groove and the extreme position limiting groove in the front-to-back direction, and the second small hole being arranged at a position corresponding to the corner portion in the front-to-back direction.

[0028] The term "corresponding" herein means that a slender object can be inserted into the small hole to push the limit block.

[0029] With the above structure, since the first small hole and the second small hole are provided, the first small hole is arranged at a position corresponding to the connecting portion of the pre-installed position holding groove and the extreme position limiting groove in the front-to-back direction, and the second small hole is arranged at a position corresponding to the corner portion in the front-to-back direction. Therefore, when the limit block moves to the connecting portion of the pre-installed position holding groove and the extreme position limiting groove, the limit block can be easily moved from the extreme position limiting groove to the pre-installed position holding groove with the help of the first small hole; in addition, when the limit block moves to the corner portion of the pre-installed position holding groove, the limit block can be easily moved from the position holding portion to the guide portion side with the help of the second small hole.

[0030] Preferably, the front-rear position of the front end of the corner portion is set so that the front end of the core rod does not extend out of the injection head when the limit block moves to the front end of the corner portion.

[0031] By adopting the above structure, the bag tension ring loaded on the front end of the core rod can be reliably prevented from falling off.

[0032] Preferably, the limit block has a base installed on the core rod and a column portion extending from the base, the column portion moves along the pre-installed position maintaining groove and the extreme position limiting groove, and the corner portion is formed so that when the column portion moves from the end of the position maintaining portion to the connecting end connected to the guide portion, the column portion is located as a whole on the side of the convex point of the corner portion close to the guide portion in the circumferential direction.

[0033] By adopting the above structure, when the column moves from the end of the position holding portion to the connection end connected to the guide portion, the column is located as a whole on the side of the guide portion on the convex point of the corner portion in the circumferential direction. Therefore, it is possible to suppress the column from getting stuck due to the obstruction of the convex point when it moves along the guide portion to the side of the extreme position limit groove.

[0034] Preferably, the injection cylinder is made of a transparent or translucent material.

[0035] With the above structure, since the injection cylinder is made of a transparent or translucent material, when the limit block is pushed by the needle, the position of the limit block can be easily observed and the pushing operation can be performed reliably.

[0036] The limiting block can be mounted on the core rod in a freely rotatable manner.

[0037] The present invention also relates to a preloaded bladder tension ring, which comprises a preloaded bladder tension ring pusher of any of the above structures, on which a bladder tension ring is preloaded, wherein the core rod is in the tension ring preloaded position.

[0038] The so-called "preloaded bladder tension ring pusher" in the present invention refers to a bladder tension ring pusher that can be preloaded with a bladder tension ring, and the "preloaded bladder tension ring" refers to an object formed by preloading a bladder tension ring on a preloaded bladder tension ring pusher.

[0039] The present invention also relates to a bladder tension ring preloading method, which is a method for preloading a bladder tension ring on a preloaded bladder tension ring pusher, the preloaded bladder tension ring pusher comprising: a pusher barrel; a pusher head, which is arranged at the front end of the pusher barrel; a core rod, which can move forward and backward 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 limiting block is arranged on the core rod, and a preloading position retaining groove is arranged on the peripheral wall of the barrel portion of the pusher barrel, the core rod is retained in the tension ring preloading position by the engagement of the limiting block and the preloading position retaining groove, the preloading position retaining groove is composed of a bottomed groove arranged on the inner peripheral wall of the barrel portion, and a through small hole is arranged on the peripheral wall of the barrel portion, the small hole can allow a thin object to penetrate and push the limiting block, the limiting block is rotatably mounted on the core rod, and in the method, the limiting block is rotated by the thin object penetrating the small hole.

[0040] In addition, the present invention also relates to a bladder tension ring preloading method, which is a method for preloading a bladder tension ring on a preloaded bladder tension ring pusher, the preloaded bladder tension ring pusher comprising: a pusher barrel; a pusher head, which is arranged at the front end of the pusher barrel; a core rod, which can move forward and backward 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 limiting block is arranged on the core rod, and a preloading position retaining groove is arranged on the peripheral wall of the barrel portion of the pusher barrel, the core rod is retained in the tension ring preloading position by the engagement of the limiting block and the preloading position retaining groove, the preloading position retaining groove is composed of a bottomed groove arranged on the inner peripheral wall of the barrel portion, the limiting block is mounted on the core rod in a freely rotatable manner, the limiting block is mounted on the core rod in a freely rotatable manner, and in the method, the limiting block is rotated by vibration and / or gravity.

[0041] The difference between "rotatable" and "freely rotatable" is that "rotation" includes the situation of "free rotation". In addition, it also includes the situation of "friction rotation" which requires an external force of a certain strength to achieve during rotation, for example, by mounting the base of the limit block in the specific implementation method on the core rod with a certain clamping force so as to maintain a certain clamping force between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The figure shows a front view of a pre-installed bladder tension ring pusher in a state where the bladder tension ring is pre-installed in a specific embodiment;

[0043] Figure 2 Shown is a front view of the pre-loaded bladder tension ring pusher with the pusher barrel opened;

[0044] Figure 3 The figure shows the structure of the injection head in a specific embodiment, wherein (a) is a front view and (b) is a cross-sectional view;

[0045] Figure 4 It shows the structure of the injection cylinder in the open state;

[0046] Figure 5 The figure shows an oblique view of the upper half of the injection cylinder;

[0047] Figure 6 is a schematic diagram for representing the structure of a curved limiting groove;

[0048] Figure 7 1 shows the structure of the limit block in this embodiment, wherein (a) is a front view and (b) is a side view;

[0049] Figure 8 It is a front view of the core rod in a specific embodiment;

[0050] Fig. 9 is an oblique view of the core rod;

[0051] Fig.10 It is a figure used to illustrate the pre-installation process of the bladder tension ring involved in a specific embodiment, and the state shown in the figure is that the core rod is at the front end position of the stroke;

[0052] Fig.11 1 is a figure for illustrating the pre-installation process of the bladder tension ring involved in a specific embodiment, and the state shown in the figure is the position state of the limit block entering the curved limit groove from the straight limit groove;

[0053] Fig.12 Shown is a front view of the upper half of the push cylinder;

[0054] Fig.13 The figures are used to illustrate the structure of the small hole for the operation stop block on the injection cylinder, wherein (a) is a figure obtained when the lower half of the injection cylinder is observed from the inside, (b) is a figure obtained when it is observed from the outside, and (c) is a figure obtained when the upper half of the injection cylinder is observed from the outside;

[0055] Fig.14 The figure is a structural illustration of a modified example of a loading column;

[0056] Fig.15 Shown is a structural illustration of another modified example of the loading column;

[0057] Fig.16 The figure is a structural illustration of a modified example of a push rod;

[0058] Fig.17 Shown is a structural illustration of another modified example of the push rod;

[0059] Fig.18 Shown is the structure of the bladder tension ring;

[0060] Fig.19 The structure of the injection head involved in Variation 3 is shown;

[0061] Fig. 20 The structure of the push cylinder involved in the modification example 3 is shown;

[0062] Fig.21 The structure of the push cylinder involved in the modification example 4 is shown;

[0063] Fig. 22 The structure of the curved limiting groove involved in Modification Example 5 is shown;

[0064] Fig.23 The structure of the push cylinder involved in the modification example 6 is shown;

[0065] Fig.24 The structure of the core rod involved in Modification Example 7 is shown;

[0066] Fig.25 The structure of the core rod involved in Modification Example 8 is shown;

[0067] Fig.26 , 27 The figure shows the front structure of the syringe involved in the modification example 9.

[0068] Description of Reference Numerals

[0069] 100 Pre-assembled bag tension ring pusher; 10 Pushing cylinder; 10A Lower half cylinder; 10B Upper half cylinder; 11 Cylinder body; 12 Grip; 12A Grip; 20 Core rod; 20a Guide strip; 21 Push rod; 21' Push rod; 21" Push rod; 21a Indicator groove; 22 Piston; 22a O-ring groove; 22b limit block groove; 23 push needle; 23a reinforcing rib; 24 spring fixing column; 24a base; 25 limit block; 26 O-ring; 27 thumb handle; 30 injection head; 30a inner cavity; 31 injection barrel connecting part; 31a anti-rotation protrusion; 31a1 positioning groove; 31b clamping groove; 31c end face; 31d spring positioning protrusion; 32 transition part; 33 guide tube part; 33a inclined part; 40 return spring; 100 injection device; 110 curved limit groove; 110a guide part; 110b retaining part; 110c convex point; 111 guide groove; 112a the first small hole; 112b the second small hole; 113 linear limiting groove; 113A lower semi-linear limiting groove; 113B upper semi-linear limiting groove; 114 buckle; 115 groove; 116 engaging recess; 117 stopping wall; 117a through hole; 117b stopping recess; 117c positioning protrusion; 118 material reduction groove; 119 identification part; 120 engaging protrusion; 200 bag tension ring; 201 positioning hole; 231 front end of push pin; 231a loading column; 250 base; 251 column. DETAILED DESCRIPTION

[0070] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0071]

Overall structure

[0072] Figure 1 Shown is a front view of a preloaded bladder tension ring consisting of a bladder tension ring and a preloaded pusher. Figure 2 Shown is a front view of a preloaded bladder tension ring pusher with the pusher barrel open. Fig.18 Shown is the structure of the bladder tension ring.

[0073] like Figure 1 As shown, usually when leaving the factory, the pre-installed bladder tension ring pusher 100 (sometimes also referred to as the pusher) is pre-installed with a bladder tension ring 200, and the assembled bladder tension ring 200 and the pre-installed bladder tension ring pusher 100 constitute a pre-installed bladder tension ring. The pre-installed bladder tension ring pusher 100 mainly includes a pusher barrel 10, a core rod 20, a pusher head 30, and a return spring 40. The pusher barrel 10 is the main body of the bladder tension ring pusher 100, and is generally in the shape of a long cylinder, with the pusher head 30 installed at its front end, and the inner cavity 30a ( Figure 3 ) is connected to the inner space of the injection cylinder 10.

[0074] like Fig.18As shown, the bag tension ring 200 is a C-shaped open ring, and positioning holes 201 are formed at both ends thereof for loading on the tension ring pusher (implanter) 100. The bag tension ring 200 can be loaded on the loading column 231a ( Figure 8 , Fig. 9 ) is pulled into the injection head 30 by the push needle 23 with the positioning hole 201 at one end thereof hooked therein. When being gradually pulled in, the capsular tension ring 200 is deformed, and before the surgical operation of pushing the capsular tension ring 200 into the human eye is about to be performed, the capsular tension ring 200 is completely received in the injection head 30 in a nearly straightened state.

[0075] In addition, the core rod 20 is configured to be movable forward and backward in the injection cylinder 10, and can pull the bladder tension ring 200 into the injection head 30 or push the bladder tension ring 200 located in the injection head 30 forward (injection action).

[0076] In addition, a return spring 40 is provided between the core rod 20 and the injection cylinder 10, and the return spring 40 applies force to the core rod 20 backward. When the operator pushes the core rod 20 forward, the force of the return spring 40 needs to be overcome, and when the operator releases the pushing force on the core rod 20, the core rod 20 moves backward (resets) under the action of the return spring 40.

[0077] In the preloaded bag tension ring injector 100 of the present invention, the core rod 20 has three positions within the travel range in the front-to-back direction, namely, the front end position, the rear end position and the tension ring preloading position located therebetween. At the front end position, the front end portion of the push pin 23 described later extends out of the injector head 30. At this position, either the bag tension ring 200 can be hung on the push pin 23 by the operator, or the push pin 23 completely pushes the bag tension ring 200 out of the injector head 30; at the rear end position, it is either the initial state of the bag tension ring injector 100 after assembly, or the bag tension ring 200 is completely pulled into the injector head 30 by the push pin 23 and is about to undergo surgery; at the tension ring preloading position, the push pin 23 pulls a portion of the bag tension ring 200 into the injector head 30.

[0078] In particular, in order to keep 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 holding mechanism, which will be described in detail later.

[0079] The various components of the bladder tension ring injector 100 are described in detail below.

[0080] In this specification, as can also be understood from the above, regarding the definition of directions, the direction in which the capsular tension ring 200 is pushed out from the injector 100 is defined as the front, and correspondingly, the opposite direction is the rear. And, in this embodiment, the front-rear direction is consistent with the axial direction of the syringe barrel 10 which is the main body of the injector. Additionally, unless otherwise specified, the "circumferential direction" described in this embodiment is consistent with the circumferential direction of the syringe barrel 10, and the "radial direction" is consistent with the radial direction of the syringe barrel 10 (outer circumference - inner circumference direction).

[0081]

Injector Head

[0082] Figure 3 Shows the structure of the injector head in this embodiment, where (a) is the front view and (b) is the sectional view.

[0083] As Figure 3 shown, the injector head 30 is an integrally formed polymer injection molded part, which successively has a syringe barrel connection part 31 for connecting the syringe barrel 10, a transition part 32 whose outer diameter gradually decreases from the rear side to the front side, and a slender tubular guide tube part 33 from the rear to the front. The syringe barrel connection part 31 has an annular card slot 31b provided on the outer circumferential surface and a pair of anti-rotation protrusions 31a protruding radially outward from the bottom surface of the card slot 31b, and the pair of anti-rotation protrusions 31a are located at positions opposite to each other in the circumferential direction (separated by 180 degrees). Additionally, the syringe barrel connection part 31 also has a spring positioning protrusion 31d protruding backward from the rear end surface 31c for positioning the front end part of the return spring 40.

[0084] Additionally, as Figure 3 shown in (b) of it, a through cavity 30a is provided in the injector head 30, and the cavity 30a can completely accommodate the capsular tension ring 200.

[0085] The front end of the injector head 30 is a slender guide tube part 33, whose outer diameter size is about 1.75mm * 1.24mm, and the wall thickness is about 0.26mm. The front end is formed into an inclined surface part 33a with an angle of approximately 45°, which is convenient for inserting into the eye surface surgical incision. As Figure 3 shown, the cross-section of the X section (the first section, inside the guide tube part 33) of the cavity 30a of the injector head 30 is in the shape of a "□", and the cross-section of the Y section (the second section) is in a shape similar to a "convex" character. The cavity 30a cooperates with the push needle 23 described later, and the push needle 23 can slide in the cavity 30a and is guided by the cavity 30a. The designed total length of the cavity 30a is 41mm. As shown in Table 1, the maximum arc length of the capsular tension ring 200 is 37.1mm, and this injector head 30 is sufficient to accommodate the capsular tension rings 200 of the four specifications shown in Table 1, having universality. As Fig.18As shown, the bag tension ring 200 is a C-shaped component with a certain curvature. In the pre-installed state, there must be a section of the arc received in the approximately straight inner cavity 30a. If it is stored in this state for a long time, it may cause irreversible deformation of the arc segment. In order to avoid this problem, the invention reduces the size of the pre-installed injection head on the one hand and strictly controls it at about 4.5mm; on the other hand, the size of the inner cavity 30a is increased as much as possible to provide a larger space for the pre-installed arc segment to maintain its arc shape.

[0086] Table 1 Specifications and dimensions of the bag tension ring

[0087] Specification Overall diameter(mm) Section side length (mm) Positioning hole diameter (mm) Arc length(mm) CTR1109 11.0 0.2 0.40 27.5 CTR1210 12.0 0.2 0.40 30.7 CTR1311 13.0 0.2 0.40 33.9 CTR1412 14.0 0.2 0.40 37.1

[0088]

Injection Cylinder

[0089] Figure 4 It shows the structure of the injection cylinder in the open state. Figure 5 Shown is an oblique view of the upper half of the injection cylinder. Figure 6 It is a schematic diagram for representing the structure of a curved limiting groove.

[0090] like Figure 1 , 2 As shown in Figures 4 and 5, the injection cylinder 10 is made of a transparent or translucent material and is in the shape of an elongated cylinder as a whole. It has a barrel portion 11 and a circular ring-shaped gripping portion 12 formed on the outer peripheral surface of the barrel portion 11. In addition, in the present embodiment, the injection cylinder 10 is a two-half structure split along the axial direction, including a lower semi-barrel portion 10A (first semi-barrel portion) and an upper semi-barrel portion 10B (second semi-barrel portion) respectively injection molded. In the following description, for the structure on the side of the lower semi-barrel portion 10A, the capital letter "A" is attached after the Arabic numerals, and for the structure on the side of the upper semi-barrel portion 10B, the capital letter "B" is attached after the Arabic numerals. When the upper and lower halves are not distinguished and are collectively referred to, the capital letters "A" and "B" are removed. In addition, the "upper" and "lower" of the lower semi-barrel portion 10A and the upper semi-barrel portion 10B are used for the convenience of description and do not constitute a limitation of the present invention.

[0091] The lower semi-cylinder portion 10A and the upper semi-cylinder portion 10B are buckled together. Specifically, a buckle 114 protruding toward the upper semi-cylinder portion 10B is provided on the lower semi-cylinder portion 10A, and a groove 115 corresponding to the position is provided on the outer peripheral surface of the upper semi-cylinder portion 10B, and the buckle 114 is embedded in the groove 115; in addition, a snap-fitting recess 116 is formed on the gripping portion 12A of the lower semi-cylinder portion 10A, and a snap-fitting protrusion 120 is formed on the upper semi-cylinder portion 10B, and the snap-fitting recess 116 is snap-fitted with the snap-fitting protrusion 120.

[0092] In addition, a linear limiting groove 113, a curved limiting groove 110, and a guide groove 111 are provided on the inner circumferential wall of the barrel portion 11. The linear limiting groove 113 is used to limit the travel limit position (the front end position and the rear end position) of the core rod 20, corresponding to the limit position limiting groove in the present invention, the curved limiting groove 110 is used to keep the core rod 20 in the tension ring pre-installed position, corresponding to the pre-installed position holding groove in the present invention, and the guide groove 111 is used to guide the forward and backward movement of the core rod 20.

[0093] In addition, in the present embodiment, the straight limit groove 113, the curved limit groove 110, and the guide groove 111 are all composed of bottomed grooves opened on the inner circumferential wall of the barrel portion 11 of the injection cylinder 10, that is, these grooves are not transparent and do not penetrate the circumferential wall of the barrel portion 11 of the injection cylinder 10.

[0094] The linear limiting groove 113 and the guide groove 111 are approximately 90 degrees apart in the circumferential direction and extend in a straight line along the front-to-back direction. The front and rear ends of the linear limiting groove 113 are both closed, so as to limit the travel limit position of the core rod 20 by blocking the movement of the limiting block 25 as described later. The rear end of the guide groove 111 is open (there is an opening on the rear end surface of the barrel 11), and the front end extends to a position forward of the front end of the linear limiting groove 113, and guides the front and rear movement of the core rod 20 by cooperating with the guide strip 20a on the core rod 20 described later.

[0095] The curved limit groove 110 is connected to the linear limit groove 113 at a specified position midway along the linear limit groove 113, and extends in a curved shape to one side (one side in the circumferential direction) of the linear limit groove 113. The limit block 25 described later can move from the linear limit groove 113 and remain in the curved limit groove 110, thereby maintaining the core rod 20 in the tension ring pre-installed position.

[0096] like Figure 4-6 As shown, the curved limit groove 110 is in the shape of a symbol "√" as a whole, and has a guide portion 110a extending obliquely toward one side of the linear limit groove 113 and forward, and a position retaining portion 110b that folds back from the front end of the guide portion 110a and continues to extend toward one side of the linear limit groove 113 but toward the rear. In this embodiment, the angle of the corner portion between the guide portion 110a and the position retaining portion 110b is set at 60° to 75°. In addition, the position of the front end of the corner portion in the front-to-back direction is set so that when the limit block 20 moves to this point, a part of the bladder tension ring 200 is still received in the injection head 30, thereby preventing the bladder tension ring 200 from falling off. The guide portion 110a is used to guide the limit block 20 from the linear limit groove 113 to the position retaining portion 110b, and the position retaining portion 110b is used to maintain the position of the limit block 20. Specifically, as Figure 6As shown, the limit block 20 moves from position C connected to the linear limit groove 113 along the guide portion 110a to position D which is the corner portion between the guide portion 110a and the position holding portion 110b, and then moves from position D to position E in the position holding portion 110b and is held at position E (described in detail later). Figure 6 The moving route of the limit block 20 (column 251 ) shown in FIG. 1 is substantially consistent with the center line of the guide portion 110 a and the retaining portion 110 b . The groove width of the guide portion 110 a and the retaining portion 110 b is slightly larger than the column 251 of the limit block 20 .

[0097] In addition, in the present embodiment, the corner portion between the guide portion 110a and the position holding portion 110b is set so that when the column portion 251 of the limit block 25 described later is moved forward and backward by the core rod 20, it can move circumferentially from the position holding portion 110b to the guide portion 110a only due to the forward and backward movement of the core rod 20, but cannot move circumferentially from the guide portion 110a to the position holding portion 110b only due to the forward and backward movement of the core rod 20.

[0098] In addition, in the present embodiment, the guide groove 111 is formed on the lower semi-cylinder 10A; half of the linear limiting groove 113 is formed on the lower semi-cylinder 10A (lower semi-linear limiting groove 113A), and the other half is formed on the upper semi-cylinder 10B (upper semi-linear limiting groove 113B), and a complete linear limiting groove 113 is formed by the buckling of the lower semi-cylinder 10A and the upper semi-cylinder 10B; the curved limiting groove 110 is formed on the upper semi-cylinder 10B. In this way, by forming the linear limiting groove 113 into two halves, the curved limiting groove 110 is completely formed in one semi-cylinder (upper semi-cylinder 10B), avoiding the formation of an uneven portion at the joint of the curved limiting groove 110 with a more complicated shape across the semi-cylinder, so that the curved limiting groove 110 can smoothly guide the movement of the limiting block 25.

[0099] In addition, if Figure 4 , 5 As shown, a locking wall 117 protruding radially inward is formed on the inner circumferential surface of the front end of the barrel 11, a through hole 117a penetrating front and rear is provided on the inner circumferential side of the locking wall 117, and a pair of locking recesses 117b recessed radially outward are provided on the inner circumferential surface of the through hole 117a, and the locking recesses 117b are half formed in the upper semi-cylindrical portion 10B and half formed in the lower semi-cylindrical portion 10A. The locking wall 117 is embedded in the groove 31b of the injection barrel connecting portion 31 of the injection head 30, and the front end surface of the locking wall 117 abuts against the front wall surface of the groove 31b, thereby preventing the injection head 30 from detaching forward from the injection barrel 10; in addition, the anti-rotation protrusion 31a on the injection barrel connecting portion 31 is embedded in the locking recess 117b, thereby preventing the injection head 30 from rotating.

[0100] When assembling the tension ring injector 100, with the upper semi-cylinder 10B and the lower semi-cylinder 10A opened, the retaining wall 117 of one of the upper semi-cylinder 10B and the lower semi-cylinder 10A is embedded in the retaining groove 31b on the injector barrel connecting portion 31 of the injector head 30, and then the upper semi-cylinder 10B and the lower semi-cylinder 10A are snapped together to fix the injector head 30 on the injector barrel 10.

[0101] In addition, in the present embodiment, the barrel portion 11 of the injection barrel 10 is further provided with a first small hole 112a and a second small hole 112b ( Fig.13 ), however, for ease of understanding, the specific structure will be described after the limit block 25 is described in detail.

[0102]

Core rod

[0103] Figure 8 It is a front view of the core rod in this embodiment. Fig. 9 It is an oblique view of the core rod.

[0104] like Figure 8 , 9 As shown, the core rod 20 is an integral injection-molded component, and has, from back to front, a thumb handle 27 , a push rod 21 , a piston 22 , a spring fixing column 24 , and a push pin 23 .

[0105] The thumb handle 27 is arranged at the rear end of the push rod 21, always exposed outside the injection cylinder 10, and is circular when viewed from the front and rear directions. Its rear end surface is formed into a shape that is easy for the thumb to fit in, so that the operator can push the push rod 21. The push rod 21 is a rod with a "cross" cross section, and its front end is connected to the piston 22. The outer peripheral surface of the piston 22 is provided with two annular O-ring grooves 22a, in which the silicone O-rings 26 ( Figure 2 , Fig.10 , Fig.11 ), and the inner peripheral wall of the barrel portion 11 of the injection barrel 10 is slidably contacted through the O-ring 26, which can stabilize the injection speed and provide a good user experience. In addition, on the outer peripheral surface of the piston 22, an annular stopper groove 22b is formed on the front side of the O-ring groove 22a, and the stopper groove 22b is used to install the stopper 25.

[0106] In addition, in the present embodiment, a guide strip 20a (guide protrusion) extending in the front-to-back direction is provided on the outer circumferential surface of the push rod 21 and the piston 22. The guide strip 20a is embedded in the guide groove 111 on the inner circumferential surface of the barrel portion 11 of the injection cylinder 10 and can slide along the guide groove 111, thereby guiding the front-to-back movement of the push rod 21, the piston 22 and even the entire core rod 20, and at the same time preventing the core rod 20 (especially the push pin 23) from rotating.

[0107] The front end of the piston 22 is connected to a spring fixing column 24, which is a columnar shape that gradually tapers forward. The return spring 40 is sleeved on the spring fixing column 24, and its rear end surface abuts against the front end of the piston 22. The front end of the spring fixing column 24 is connected to a thin rod-shaped push pin 23 (push injection component), and a reinforcing rib 23a extending in the front-to-back direction is provided on the lower outer peripheral surface of the push pin 23. The reinforcing rib 23a cooperates with the downward "convex" cross section of the Y section (the second section) of the push injection head 30 (in fact, a downward concave portion is formed to cooperate with the concave portion). In addition, a plane portion (a plane portion facing the outer circumference) parallel to the front-to-back direction (the length direction of the push pin 23) is formed at the front end of the push pin 23, and a loading column 231a protruding cylindrically toward the outer circumference is provided on the plane portion, so that a hook portion is formed at the front end 231 of the push pin 23, and the loading column 231a can extend into the positioning hole 201 ( Fig.10 ) in the bag, thereby hooking the bag tension ring 200.

[0108]

Limiting block

[0109] Figure 7 The structure of the limit block in this embodiment is shown, wherein (a) is the front view and (b) is the side view.

[0110] like Figure 7 As shown, the stopper 25 has a base 250 and a column (pin) 251. When viewed in the front-to-back direction, the base 250 is in a C-shaped ring shape with an opening facing downward. By expanding the opening, the base 250 is deformed so that it can be installed in the stopper groove 22b on the piston 22. In this way, the stopper 25 is installed on the piston 22 in a manner that it can rotate relatively but cannot move forward and backward. The column 251 protrudes radially outward from the opposite side of the opening of the base 250, and is embedded in the stopper groove (including the linear stopper groove 113 and the curved stopper groove 110) on the inner circumferential surface of the barrel 11 of the injection cylinder 10, and can slide along the stopper groove.

[0111] [Limit block operation hole]

[0112] Fig.13 The figures are used to explain the structure of the small hole for the operation stopper on the injection cylinder, wherein (a) is a figure obtained when the lower half of the injection cylinder is observed from the inside, (b) is a figure obtained when the lower half of the injection cylinder is observed from the outside, and (c) is a figure obtained when the upper half of the injection cylinder is observed from the outside. In addition, (c) shows a curved stopper groove 110.

[0113] like Fig.13As shown, two small holes penetrating inside and outside, namely the first small hole 112a and the second small hole 112b, are provided on the peripheral wall of the barrel portion 11 of the injection cylinder 10. The position of the first small hole 112a in the front-to-back direction is roughly the same as the position of the connection between the straight limiting groove 113 and the curved limiting groove 110, and the position of the second small hole 112b in the front-to-back direction is roughly the same as the corner portion between the guide portion 110a and the position holding portion 110b in the curved limiting groove 110.

[0114] In addition, in this embodiment, the curved limiting groove 110 is arranged on one side of the linear limiting groove 113, and the first small hole 112a is arranged on the other side of the linear limiting groove 113. The second small hole 112b is arranged on one side between the curved limiting groove 110 and the linear limiting groove 113 in the circumferential direction (more specifically, between the corner portion of the linear limiting groove 113 and the curved limiting groove 110).

[0115] When performing the pre-installation operation of pre-installing the bag tension ring 200 on the pusher 100, the operator can use a needle (needle-like object) to penetrate the first small hole 112a or the second small hole 112b to push the column 251 ( Figure 7 ) moves in the circumferential direction (i.e., the limit block 25 rotates around the axis of the front-to-rear direction relative to the cylindrical portion 11).

[0116] Specifically, the operator uses a needle to penetrate the first small hole 112a to push the column 251 from the straight limit groove 113 into the curved limit groove 110. In addition, the operator uses a needle to penetrate the second small hole 112a to push the column 251 from the guide part 110a (or from the corner between the guide part 110a and the position holding part 110b) into the position holding part 110b. In other words, in this embodiment, the action of the column 251 entering the curved limit groove 110 from the straight limit groove 113 and the action of entering the guide part 110a from the position holding part 110b in the curved limit groove 110 are achieved by the operator using a needle to penetrate the first and second small holes 112a, 112b to push the column 251.

[0117] In the present embodiment, the diameters of the first small hole 112a and the second small hole 112b are 0.8 mm, and the range of the hole diameters can be set to 0.8±0.2 mm.

[0118]

Return spring

[0119] like Figure 2As shown, the return spring 40 is arranged in the barrel portion 11 of the injection cylinder 10, between the front end of the barrel portion 11 and the piston 22 of the core rod 20, and is installed in a compressed state to apply a backward force to the core rod 20. Specifically, the front end of the return spring 40 is sleeved on the spring positioning protrusion 31d at the rear end of the injection cylinder connecting portion 31 of the injection head 30, and abuts against the rear end surface 31c of the injection cylinder connecting portion 31 from the rear; on the other hand, the rear end of the return spring 40 is sleeved on the spring fixing column 24 of the core rod 20, and abuts against the front end surface of the piston 22 from the front. In this way, by applying a backward force to the piston 22, a backward force is applied to the entire core rod 20.

[0120]

Capsular tension ring pre-installation method

[0121] The following is a description of a method for pre-installing the bladder tension ring 200 on the tension ring pusher 100 having the above structure.

[0122] Fig.10 It is a drawing for illustrating the pre-installation process of the bladder tension ring involved in this embodiment, and the state shown in the drawing is that the core rod is at the front end position of the stroke. Fig.11 It is an illustration for illustrating the pre-installation process of the bladder tension ring involved in the present embodiment, and the state shown in the figure is the position state of the limit block entering the curved limit groove from the straight limit groove. Fig.12 Shown is a front view of the upper half of the injection cylinder.

[0123] like Figure 2 As shown, in the initial state, under the action of the return spring 40, the core rod 20 is located at the rearmost position of the stroke. At this time, the column 251 of the limit block 25 moves to its rearmost end in the linear limit groove 113 and is stopped by its rear wall surface, so that the core rod 20 is kept at the rearmost position. Fig.10 As marked in , the position where the column 251 is located is position A.

[0124] In this initial state, when the bag tension ring 200 needs to be pre-installed on the injector 100, the operator clamps the barrel 11 of the injector barrel 10 between the index finger and the middle finger, and hooks the gripping part with these two fingers, and places the thumb on the rear surface of the thumb handle 27, so that the thumb handle 27 is pushed forward to move the push rod 21, the piston 22, and the push needle 23 (core rod 20) forward. At this time, since the limit block 25 is installed on the piston 22 in a manner that it cannot move forward and backward, the limit block 25 moves forward with the piston 22, and its column 251 slides forward in the linear limit groove 113 on the barrel 11 of the injector barrel 10. When the column 251 moves to the front end (position B) of the linear limit groove 113, it is blocked by the front wall of the linear limit groove 113 and cannot move forward further, so that the core rod 20 cannot move forward further, and the core rod 20 reaches the front end position of its stroke. At this time, the front end of the push pin 23 extends out of the guide tube portion 33 of the injection head 30 (about 3 mm). In this state, the operator can hang the bag tension ring 200 on the push pin 23. Specifically, the operator makes the loading column 231a at the front end of the push pin 23 extend into the positioning hole 201 at one end of the bag tension ring 200, so that the bag tension ring 200 can be loaded on the push pin 23.

[0125] Afterwards, the operator releases or reduces the push on the thumb handle 27, and under the action of the return spring 40, the core rod 20 moves backward, and the push pin 23 pulls one end of the bag tension ring 200 to pull it into the guide tube portion 33 of the injection head 30. On the other hand, driven by the piston 22, the column 251 of the limit block 25 moves backward in the linear limit groove 113. When the column 251 moves to the position (position C) where the linear limit groove 113 connects with the curved limit groove 110, the operator presses the thumb handle 27 to stop the core rod 20 and the limit block 25 from moving backward and keep them in a stationary state.

[0126] Afterwards, use a needle (or a needle-like object, not shown) to penetrate the first small hole 112a whose front and rear positions are roughly consistent with the connecting part between the straight limit groove 113 and the curved limit groove 110, and push the column 251 of the limit block 25 toward the curved limit groove 110 in the circumferential direction. As a result, the limit block 25 rotates so that its column 251 enters the curved limit groove 110 from the straight limit groove 113.

[0127] Then, the operator pushes the core rod 20 to move it forward, and the column 251 of the limit block 25 moves forward along the guide portion 110a of the curved limit groove 110 until it reaches the connection between the guide portion 110a and the position holding portion 110b (corner portion). When the column 251 reaches the end (front end) of the guide portion 110a, the column 251 cannot continue to move forward. In this state, the operator inserts a needle (or a needle-like object) into the second small hole 112b whose front and rear positions are consistent with the connection between the guide portion 110a and the position holding portion 110b, and pushes the column 251 of the limit block 25 toward the position holding portion 110b in the circumferential direction. As a result, the limit block 25 rotates, causing the column 251 to move slightly and move from the guide portion 110a side to the position holding portion 110b at the corner.

[0128] After that, the operator releases or reduces the push on the thumb handle 27, the core rod 20 moves backward, and the column portion 251 of the limit block 25 moves backward along the position holding portion 110b. When it reaches the rear end of the position holding portion 110b, it is blocked by the rear end wall thereof and stops at this position (position E). In this way, the core rod 20 is maintained at the tension ring pre-installed position. In addition, due to the action of the return spring 40, the core rod 20 can be reliably maintained at the tension ring pre-installed position.

[0129] The bladder tension ring 200 is pre-installed in the bladder tension ring pusher 100, and then packaged and shipped.

[0130] When the core rod 20 is located at the tension ring pre-installation position, only a small part of the bladder tension ring 200 is pulled into the injection head 30. In this way, the long-term forced deformation part of the bladder tension ring 200 is minimized.

[0131]

Injection method

[0132] The following is a description of a method for injecting the capsular tension ring 200 into a human eye.

[0133] First, the operator takes out the pusher 100 pre-installed with the bag tension ring 200 from the package. As mentioned above, at this time, the core rod 20 remains in the tension ring pre-installed position, and the column 251 of the limit block 25 is located in the position holding portion 110b of the curved limit groove 110 (position E). In this state, the operator pushes the thumb handle 27 to move the core rod 20 forward. Driven by the core rod 20, the column 251 of the limit block 25 moves forward along the position holding portion 110b until it moves to the corner portion (position D) between the position holding portion 110b and the guide portion 110a and cannot move forward any further. At this time, as mentioned above, the column 251 can also be said to have entered the guide portion 110a. Afterwards, the operator releases or reduces the push on the thumb handle 27, and under the action of the reset spring 40, the core rod 20 moves backward, driving the limit block 25 to move backward, and the column 251 of the limit block 25 moves backward along the guide portion 110a to reach the connection portion (position C) of the curved limit groove 110 and the straight limit groove 113, and then enters the straight limit groove 113 from the curved limit groove 110, and continues to move backward along the straight limit groove 113 until it is blocked by the rear end wall of the straight limit groove 113 and stops at this position (position A). At this time, the core rod 20 reaches the rear end position of the stroke.

[0134] On the other hand, the push pin 23 of the core rod 20 moves backward, further pulling the bag tension ring 200 into the injection head 20. When the core rod 20 reaches the rearmost position, the bag tension ring 200 has been completely pulled into the injection head 20, and is roughly in a completely straightened state.

[0135] Afterwards, the operator inserts the front end of the guide tube portion 33 of the injection head 30 of the injection device 100 into the incision of the affected eye, and pushes the thumb handle 27 forward again to move the core rod 20 forward. At this time, the column portion 251 of the limit block 25 moves forward along the linear limit groove 113 until it moves to the front end of the linear limit groove 113 and stops moving. In this process, the push needle 23 of the core rod 20 gradually pushes the capsular tension ring 200 out of the injection head 30 and into the affected eye.

[0136] [Effects of this embodiment]

[0137] With the present embodiment as described above, since the curved limiting groove 110 as the pre-installed position holding groove is formed of a bottomed groove, it is difficult or impossible for the operator to perform relevant operations on the limiting block 25 to restore the pusher 100 to the pre-installed state, avoiding the pusher 100 from being used again (secondarily), which significantly reduces safety hazards. In addition, since the linear limiting groove 113 and the curved limiting groove 110 are formed of bottomed grooves opened on the inner peripheral wall of the barrel 11 of the pusher barrel 10, and do not penetrate the peripheral wall of the barrel 11, it can be imagined that, for example, dust can be prevented from entering the barrel 11 of the pusher barrel 10 through the transparent grooves to cause contamination.

[0138] In addition, in the present embodiment, a plane portion parallel to the length direction of the push pin 23 is formed at the front end portion of the push pin 23, and a loading column 231a is provided on the plane portion. Thus, since the loading column 231a is formed on such a plane portion, when the bladder tension ring 200 is loaded on the push pin 23, the bladder tension ring 200 is supported by the plane portion, which is beneficial for the bladder tension ring 200 to maintain a stable state.

[0139] [Variation 1]

[0140] 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 principle of the present invention should be included in the protection scope of the present invention.

[0141] For example, Fig.14 The figure shows the structure of a loading column of a modified example. Fig.15 The figure shows the structure of a loading column according to another modified example.

[0142] In the above embodiment, a cylindrical loading column 231a is exemplified, however, the present invention is not limited thereto. Fig.14 As shown, it can also be configured as a prismatic loading column 231b ( Fig.14 In addition, Fig.15 As shown, the loading column 231c may also be configured as a cylindrical loading column 231c with a pointed head.

[0143] [Variation 2]

[0144] Fig.16 The figure shows the structure of a push rod according to a modified example. Fig.17 The figure shows the structure of another modified push rod.

[0145] In the above embodiment, the push rod 21 is configured to have a cross-shaped cross section. However, the present invention is not limited thereto. Fig.16 As shown, the push rod 21 'is configured as a cylinder, or it can also be configured as Fig.17 As shown, the push rod 21" is configured as a square column.

[0146] [Variation 3]

[0147] Fig.19 The structure of the injection head involved in the third variant is shown. Fig. 20 The structure of the injection cylinder involved in the modified example 3 is shown.

[0148] like Fig.19 , 20 As shown, in this modification 3, a positioning groove 31a1 recessed toward the inner circumference is provided on the anti-rotation protrusion 31a of the injection cylinder connecting portion 31 of the injection head 30. Correspondingly, a positioning protrusion 117c protruding toward the inner circumference is provided on the bottom surface of the locking recess 117b of the barrel portion 11 of the injection cylinder 10. The positioning groove 31a1 is engaged with the positioning protrusion 117c, which plays a positioning role during the assembly process.

[0149] [Variation 4]

[0150] Fig.21 The structure of the injection cylinder involved in the modification example 4 is shown.

[0151] like Fig.21 As shown, in variant example 4, a plurality of long strip-shaped material reducing grooves 118 extending in the front-to-back direction are provided on the inner circumferential surface of the barrel portion 11 of the injection cylinder 10, thereby reducing the amount of molding material and improving the surface quality of the product.

[0152] [Variation 5]

[0153] Fig. 22 The structure of the curved limiting groove involved in variation example 5 is shown.

[0154] like Fig. 22 As shown, in variation 5, compared with the above-mentioned embodiment, the length of the position holding portion 110b of the curved limit groove 110 is increased, which is approximately more than 3 times the outer diameter of the column 251 of the limit block 25, so that the column 251 can be as far away from the protrusion 110c as possible when at the corner. In this embodiment, when the column 251 moves along the position holding portion 110b from position E (the end of the position holding portion 110b) to position D (the connecting end of the position holding portion 110b connected to the guide portion 110a), in the circumferential direction, the entire column 251 is completely located on the side of the protrusion 110c close to the guide portion 110a, and is far away from the protrusion 110c to a large extent, thereby avoiding jamming and moving smoothly along the guide portion 110a.

[0155] [Variation 6]

[0156] Fig.23 The structure of the injection cylinder involved in the modification example 6 is shown.

[0157] like Fig.23 As shown, in variation 6, a marking portion 119 (guiding warning structure) indicating the up and down directions is provided on the outer circumference of the upper half cylinder portion 10B of the injection cylinder 10, and is located in front of the grip portion 12. In this embodiment, the marking portion 119 is in English "UP", which is used to remind the operator to operate upwards, has a warning effect, and improves the safety of the instrument. As another embodiment, the marking portion 119 can be in Chinese.

[0158] [Variant 7]

[0159] Fig.24 The structure of the core rod involved in the modification example 7 is shown.

[0160] like Fig.24 As shown, in Modification 7, a first indicator groove 21a (guiding warning structure) is provided on the upper side of the push rod 21, and the front and rear positions of the first indicator groove 21a are set such that when it is exposed from the barrel portion 11 of the injection barrel 10, the bag tension ring 200 is completely pulled into the injection head 30 by the push needle 23. Thus, the indicator groove 21a has the function of indicating that the bag tension ring 200 is completely pulled in.

[0161] In addition, the base 24a of the spring fixing column 24 connected to the piston 22 is set to a cylindrical shape with a constant outer diameter from front to back, which cooperates with the inner hole of the return spring 40 to provide a more stable and reliable fixing effect.

[0162] [Variant 8]

[0163] Fig.25 The structure of the core rod involved in the eighth modification is shown.

[0164] like Fig.25 As shown, in variation 8, the push cylinder 10 can be made of an opaque material. A second indicator groove 21b (guiding warning structure) is also provided on the upper side of the push rod 21. The front and rear positions of the second indicator groove 21b are set so that when it is exposed from the barrel portion 11 of the push cylinder 10, the column 251 of the limit block 25 is located at the connection position of the linear limit groove 113 and the curved limit groove 110. Thus, the second indicator groove 21b has the function of indicating the position of the column 251 of the limit block 25.

[0165] [Variant 9]

[0166] Fig.25 , 26 The figure shows the structure involved in the modification example 9.

[0167] like Fig.25 , 26As shown, in this modified example, two arrow indicators 30b1 and 30b2 are provided on the outer surface of the push head 30, and the two are in opposite positions on the circumference. The two arrow indicators 30b1 and 30b2 are used to indicate the expansion direction of the bladder tension ring 200, so the directions indicated by the two in the circumferential direction are opposite. Specifically, in the pre-installed state, the direction of the arrow indicators 30b1 and 30b2 is consistent with the direction in which the bladder tension ring 200 extends from the push head 30 and bends and extends. This direction is consistent with the direction in which the bladder tension ring 200 is discharged from the push head 30 and expanded during push injection. By providing such arrow indicators 30b1 and 30b2, the operator can easily confirm the expansion direction of the bladder tension ring 200 during push injection, thereby facilitating the push injection operation.

[0168] In this modified example, the arrow indicating portions 30b1 and 30b2 are formed by protrusions integrally formed on the outer surface of the injection head 30. Alternatively, as another embodiment, the arrow indicating portions 30b1 and 30b2 may be formed by printed pattern portions. Also, as another embodiment, the arrow indicating portions may be provided on the injection cylinder 10, but it is preferred that the arrow indicating portions be provided on the injection head 30.

[0169] [Other modifications]

[0170] In addition, in the above-mentioned embodiment, small holes for operating the limit blocks, namely the first small hole 112a and the second small hole 112b, are opened on the barrel portion 11 of the injection cylinder 10, and the limit block 25 is rotated in the circumferential direction by means of these small holes so that its column portion 251 enters the curved limit groove 110. However, the present invention is not limited to this. For example, the small holes may not be formed, but the push rod 21 and the piston 22 may be separated into separate bodies so that they can rotate relative to each other, and the limit block 25 is fixed to the push rod 21, and the limit block 25 is rotated in the circumferential direction by rotating the push rod 21.

[0171] In addition, in the above embodiment, a curved limiting groove 110 with a corner portion is illustrated as a pre-installed position retaining groove, however, the present invention is not limited to this, for example, it can be configured as a groove extending linearly in the circumferential direction, or as a linear groove extending obliquely backward.

[0172] In addition, the small hole for moving the limiting column on the limiting block may not be provided on the push rod. Instead, the limiting block can be freely rotated on the push rod by designing the fit between the push rod and the limiting block to be a larger clearance fit. When the push rod 21 is pushed to the entrance of the curved limiting groove 110, the finger gently taps or shakes the push rod 10. Under the action of vibration and / or gravity, the limiting block 25 rotates around the push rod 21, and the column 251 of the limiting block 25 can enter the curved limiting groove 110, and similarly, it can be guided to the position holding portion 110b of the curved limiting groove 110.

Claims

1. A pre-loaded bladder tension ring pusher, comprising: Push-in cartridge; A push injection head, which is arranged at the front end of the push injection cylinder; The core rod can move forward and backward in the injection barrel, and has a tension ring pre-installed position in which a portion of the bladder tension ring is received in the injection head. A limit block is provided on the core rod, and the limit block is installed on the core rod in a manner that it can rotate around an axis in the front-rear direction. A pre-installation position retaining groove is provided on the peripheral wall of the barrel portion of the injection cylinder, and the core rod is retained in the pre-installation position of the tension ring by engaging the limit block with the pre-installation position retaining groove. The limit block is moved to a position engaged with the pre-installation position retaining groove by rotating, and is characterized in that: The pre-installation position holding groove is composed of a bottomed groove provided on the inner peripheral wall of the barrel portion.

2. The pre-assembled bladder tension ring pusher according to claim 1, characterized in that: A through hole is provided on the peripheral wall of the cylinder portion, and the small hole can allow a thin object to penetrate and push the limit block.

3. The pre-assembled bladder tension ring pusher according to claim 2, characterized in that: A limit position limiting groove connected to the pre-installed position retaining groove and limiting the stroke limit position of the core rod by cooperating with the limit block is also provided on the inner circumferential wall of the barrel portion. The limit position limiting groove is composed of a bottomed groove.

4. The pre-assembled bladder tension ring pusher according to claim 3, characterized in that: The injection cylinder is a two-half structure split along the front-to-back direction, including a first half-cylinder portion and a second half-cylinder portion, and the pre-installed position retaining groove is integrally formed on the first half-cylinder portion.

5. The pre-assembled bladder tension ring pusher according to claim 4, characterized in that: The extreme position limiting groove is in a straight line shape extending in the front-rear direction, a part of which is formed on the first semi-cylindrical portion, and the other part is formed on the second semi-cylindrical portion.

6. The pre-assembled bladder tension ring pusher according to claim 3, characterized in that: The pre-installed position retaining groove has a guide portion and a position retaining portion, wherein the guide portion extends from the extreme position limiting groove to one side in the circumferential direction and obliquely to the front side, and the position retaining portion folds back from the front end of the guide portion and extends to one side in the circumferential direction and obliquely to the rear side, forming a corner portion therebetween.

7. The pre-assembled bladder tension ring pusher according to claim 6, characterized in that: The small holes include a first small hole and a second small hole, the first small hole is arranged at a position corresponding to the connecting portion of the pre-installed position retaining groove and the extreme position limiting groove in the front-to-back direction, and the second small hole is arranged at a position corresponding to the corner portion in the front-to-back direction.

8. The pre-assembled bladder tension ring pusher according to claim 6, characterized in that: The front-to-rear position of the front end of the corner portion is set so that the front end of the core rod will not extend out of the injection head when the limit block moves to the front end of the corner portion.

9. The pre-assembled bladder tension ring pusher according to claim 6, characterized in that: The limit block has a base portion installed on the core rod and a column portion extending from the base portion, and the column portion moves along the pre-installed position holding groove and the extreme position limit groove. The corner portion is formed so that when the column portion moves from the end of the position holding portion to the connection end connected to the guide portion, the column portion is entirely located on the guide portion side of the convex point of the corner portion in the circumferential direction.

10. The pre-loaded bladder tension ring pusher according to claim 2, characterized in that: The injection cylinder is made of transparent or translucent material.

11. The pre-loaded bladder tension ring push injector according to any one of claims 1 to 10, characterized in that: The limiting block is mounted on the core rod in a freely rotatable manner.

12. A pre-assembled bladder tension ring, characterized in that: A preloaded bladder tension ring pusher comprising the preloaded bladder tension ring pusher according to any one of claims 1 to 11, wherein a bladder tension ring is preloaded on the preloaded bladder tension ring, wherein the core rod is in the tension ring preloaded position.

13. A method for pre-installing a bladder tension ring, which is a method for pre-installing a bladder tension ring on a pre-installed bladder tension ring pusher, characterized in that: The preloaded bladder tension ring pusher is the preloaded bladder tension ring pusher according to any one of claims 2 to 10, The limit block is rotatably mounted on the core rod. In the method, the limiting block is rotated by passing a thin object through the small hole.

14. A method for pre-installing a bladder tension ring, which is a method for pre-installing a bladder tension ring on a pre-installed bladder tension ring pusher, characterized in that: The pre-assembled bladder tension ring pusher has: Push-in cartridge; A push injection head, which is arranged at the front end of the push injection cylinder; The core rod can move forward and backward in the injection barrel, and has a tension ring pre-installed position in which a portion of the bladder tension ring is received in the injection head. A limit block is arranged on the core rod, and a pre-installed position retaining groove is arranged on the peripheral wall of the barrel portion of the injection cylinder, and the core rod is retained in the pre-installed position of the tension ring by the engagement of the limit block with the pre-installed position retaining groove. The pre-installation position holding groove is composed of a bottomed groove arranged on the inner peripheral wall of the barrel portion. The limit block is mounted on the core rod in a freely rotatable manner. In the method, the limit block is rotated by vibration and / or gravity.

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