CN113059067A - An assembly kit for installing an anti-return ring and an assembly method thereof - Google Patents
An assembly kit for installing an anti-return ring and an assembly method thereof Download PDFInfo
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- CN113059067A CN113059067A CN202110448529.XA CN202110448529A CN113059067A CN 113059067 A CN113059067 A CN 113059067A CN 202110448529 A CN202110448529 A CN 202110448529A CN 113059067 A CN113059067 A CN 113059067A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
- A61B17/7059—Cortical plates
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Abstract
The invention provides an assembly kit for installing an anti-withdrawal ring and an assembly method thereof, wherein the assembly kit comprises a fixing piece and a punch which are matched for use, a fixing groove for fixing a front neck circuit board main body is formed in the fixing piece, the head of the punch is of a columnar structure with a runway-shaped section or an oval section, the anti-withdrawal ring is placed in a through hole of the front neck circuit board main body, the punch is pressed downwards to be inserted into the anti-withdrawal ring, and the punch is rotated to enable the anti-withdrawal ring to expand outwards so as to be fixed in the through hole of the front neck circuit board main body. According to the invention, the head structure of the punch is changed into a cylindrical structure with a runway-shaped section or an oval section from an inverted cone, the punch extends into the anti-receding ring, the punch rotates for a circle, the outer peripheral wall of the anti-receding ring is integrally expanded and deformed under the action of a couple, the outer wall of the anti-receding ring is riveted with the inner wall of the through hole of the front neck circuit board main body, and thus the anti-receding ring is fixed with the front neck circuit board main body, and the anti-receding ring is effectively prevented from loosening and even falling off.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and relates to an assembly kit for installing an anti-withdrawal ring and an assembly method thereof.
Background
The anterior cervical approach internal fixation technique is mainly to cervical vertebra postoperative revision, cases such as osteoporosis and cervical vertebra tumour, current anterior cervical approach internal fixation device, make biomechanics be difficult to reach required effect, need increase the success rate of posterior cervical approach internal fixation in order to improve the operation for this reason, the lower anterior cervical approach pedicle of vertebral arch internal fixation technique that appears in recent years makes it have the advantage at biomechanics, can provide strong fixed, but among the prior art, the screw can produce not hard up when the fixed plate receives vibrations, intervertebral bone grafting piece easily shifts and leads to fixed inaccurate.
CN209269851U discloses an anterior cervical fixing plate, comprising: fixed plate main part and at least two sets of fixed subassemblies, fixed subassembly includes: two fixed orificess, the rotation groove has been seted up on the perpendicular bisector of the line of the centre of a circle of two fixed orificess in arbitrary a set of fixed subassembly, the spacing groove has been seted up in the rotation inslot, the through-hole has been seted up at the middle part in rotation groove, turning block fixed connection is in the one end of connecting axle, stopper fixed connection just is located the lower terminal surface department of turning block in the outer wall of connecting axle, the connecting axle passes the through-hole and rotates fixed connection rather than, the turning block is installed in rotating the groove, the stopper is installed in the spacing groove, the spacing inslot is equipped with the elastic component that the stopper of being convenient for rotates and fixes, the outer wall of turning block has seted up the put nail groove of a plurality of mounting screws of being convenient for, can oppress in the screw top after the turning block rotates certain angle.
CN209713098U discloses way screw is prevented moving back before neck and is constructed and way board before neck, should prevent moving back the structure and include first recess, boss, gland, pawl structure and boss cooperation portion. The first groove comprises a screw mounting area and a gland mounting area, and the screw mounting area is provided with a screw hole; the screw is arranged in the screw hole; the boss is arranged on the groove wall of the first groove; the gland is arranged in the gland hole; the pawl structure is provided with a first end and a second end, the first end is connected with the gland, and an elastic groove is formed between the pawl structure and the gland; the boss matching part is arranged on one side, away from the gland, of the second end of the pawl structure and can form a locking state with the boss and the groove wall; when the screw withdrawal prevention structure on the anterior cervical path is in a locking state, one part of the pawl structure is pressed above the screw to prevent the screw from withdrawing.
CN211156175U discloses low notch neck way internal fixation system, including internal fixation board, screw and screw retaining mechanism, a side of internal fixation board is arch notch face, and another side is the dissection type curved surface, the middle part of internal fixation board is the soft tissue contact site along its central axis direction, and the both sides of soft tissue contact site are the screw fixed part respectively, the thickness of soft tissue contact site is less than the thickness of screw fixed part, be equipped with observation window in the soft tissue contact site, the screw fixed part of soft tissue contact site both sides is equipped with a plurality of screw holes respectively along its length direction, and a plurality of screws are installed respectively in the screw hole that corresponds, and the screw fixed part is gone up and is located one side of every screw and all is equipped with screw retaining mechanism.
In whole orthopedics trade, current assembly technique generally carries out flaring riveting to preventing moving back the ring opening, but the riveting of this kind of mode can not make and prevent moving back the ring opening riveting and target in place, prevents moving back when the fixed plate receives vibrations because the riveting is not in place between ring and the fixed plate, can produce the displacement, leads to the screw can produce not hard up, and the intervertebral bone grafting port easily shifts and leads to fixing inaccurate. Therefore, it is necessary to design an effective tool capable of well riveting the anti-withdrawal ring orifice.
A universal riveting hole tool in the industry is designed in two parts, namely a base and a riveting punch, wherein the punch is designed to be conical, a front neck fixing plate and an anti-withdrawal ring are pre-assembled and placed on the base, the punch is aligned to an orifice of the anti-withdrawal ring and is extruded downwards, and the orifice is deformed in an inverted eight-way mode. The effect of riveting and reaming is achieved. The method has the advantages that the punch is conical, the generated inverted V-shaped deformation is generated, the plastic deformation is small, the contact surface between the anti-receding step of the orifice of the front neck circuit board and the anti-receding ring is small, the joint is easy to deform and shrink under long-time stress, and the anti-receding ring falls off to cause the screw to loosen.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an assembly kit for installing an anti-withdrawal ring and an assembly method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an assembly kit for installing an anti-withdrawal ring, the assembly kit comprises a fixing piece and a punch, the fixing piece and the punch are used in a matched mode, a fixing groove for fixing a front neck circuit board main body is formed in the fixing piece, the head of the punch is of a columnar structure with a runway-shaped section or an oval section, the anti-withdrawal ring is placed into a through hole of the front neck circuit board main body, the punch is pressed downwards to be inserted into the anti-withdrawal ring, and the punch is rotated to enable the anti-withdrawal ring to expand outwards so as to be fixed in the through hole of the front neck circuit board main body.
The assembly kit provided by the invention is mainly used for fixedly installing the anti-withdrawal ring into the front neck circuit board main body, and the main function of the anti-withdrawal ring exerted in the front neck circuit board main body is to prevent screws driven into the front neck circuit board main body from loosening and falling off.
The drift head that traditional installation prevented moving back the ring is the back taper structure, and in the installation, the drift directly pushed down makes the drill way periphery wall of preventing moving back the ring produce the deformation of falling the splayed, reaches the underreamed effect of riveting. The riveting method has the advantages that the effect of riveting and reaming is achieved mainly due to the inverted splayed deformation, the plastic deformation amount is small, the contact surface between the through hole of the neck front circuit board main body and the anti-withdrawal ring is small, and the orifice of the anti-withdrawal ring is easy to deform and shrink under long-time stress, so that the anti-withdrawal ring falls off, and finally the screw is loosened. The invention changes the head structure of the punch from the inverted cone shape into the cylindrical structure with a runway-shaped section or an oval section, the punch extends into the anti-receding ring, the punch rotates for a circle to cause the outer peripheral wall of the anti-receding ring to be integrally expanded and deformed under the action of a couple, and the outer wall of the anti-receding ring is riveted with the inner wall of the through hole of the front neck circuit board main body, so that the anti-receding ring is fixed with the front neck circuit board main body.
As a preferred technical solution of the present invention, the anti-receding ring is axially through, the anti-receding ring includes a base and a snap ring which are integrally formed, the through hole of the neck front plate main body is a stepped through hole, and is divided into a first stepped hole and a second stepped hole along a punch pressing direction, the diameter of the first stepped hole is smaller than that of the second stepped hole, the anti-receding ring is inserted into the through hole, the base is embedded into the second stepped hole, and the snap ring is embedded into the first stepped hole.
Preferably, a clamp spring is arranged between the base and the platform ring surface of the second step hole.
As a preferable technical solution of the present invention, the snap ring includes a first half ring member and a second half ring member, a concave surface of the first half ring member and a concave surface of the second half ring member are opposite to each other to form an annular structure, and gaps are left between two ends of the first half ring member and two ends of the second half ring member.
As a preferred technical scheme of the invention, a boss surface is arranged on the peripheral annular surface of the first stepped hole, and the punch is inserted into the anti-withdrawal ring and then rotated, so that the two ends of the first half-ring member and the second half-ring member are deformed and clamped into the boss surface, and the anti-withdrawal ring is fixed in the through hole of the front neck circuit board main body.
The anti-backing ring provided by the invention is also obviously different from the traditional anti-backing structure, the traditional anti-backing structure is like a screw anti-backing structure of a neck front way disclosed in CN209713098U, a gland structure is adopted, the gland is required to be installed on a screw, the gland is rotated to cover the screw, a pawl structure is arranged on the gland, the pawl structure and the gland form an elastic groove, and a boss matching part arranged on the pawl structure can be clamped with a boss and the groove wall of a first groove to form a locking state; when the screw withdrawal prevention structure for the anterior cervical vertebra is in a locking state, one part of the pawl structure is pressed above the screw, so that the effect of preventing the screw from being separated from the screw hole is achieved.
The anti-backing principle of the anti-backing ring provided by the invention is that 6 through holes are formed in the front neck circuit board main body, the 6 through holes are arranged according to a 2 x 3 matrix, the anti-backing ring provided by the invention is fixedly installed in one row of 2 through holes in the middle, and screws are inserted into the other 4 through holes, so that one screw is uniformly distributed on two sides of each anti-backing ring, two arc-shaped notches are respectively formed on two sides of the anti-backing ring base, the positions of the arc-shaped notches are opposite to the screws, and after the anti-backing ring is fixed to the front neck circuit board main body, the arc-shaped notches on two sides of the base can abut against the screws on two sides, so that the screws on two sides are fixed.
It is understood that the number and arrangement of the through holes on the anterior cervical plate body are not specifically required or limited, the above 2 × 3 matrix arrangement is only an exemplary preferred solution, and those skilled in the art can adjust the number and installation positions of the anti-back-off rings and the number and arrangement of the through holes according to actual requirements.
As a preferable technical solution of the present invention, the punch further includes a punch rod, and the head is provided at one end of the punch rod.
Preferably, the punch rod comprises a support rod and a force application rod, the support rod and the force application rod are arranged in a cross manner, the head is fixed at one end of the support rod, and the punch is rotated through the force application rod.
As a preferable aspect of the present invention, the height of the head is equal to or greater than the height of the snap ring.
As a preferable technical scheme of the invention, the fixing groove is a stepped groove.
The surface of one side of the fixing piece facing the punch is an inclined surface, so that the plane of the anti-return ring is perpendicular to the axis of the support rod of the punch.
As a preferable technical scheme of the present invention, the bottom surface of the fixing member is composed of a plane and an inclined surface which are butted with each other, the plane and the inclined surface are butted in a convex shape, the plane is horizontally arranged, and one end of the fixing member where the inclined surface is located is tilted, so that the fixing member is tilted toward one side surface of the punch.
In a second aspect, the present invention provides an assembling method for installing an anti-back-out ring by using the assembling kit of the first aspect, the assembling method comprising:
the punch is pressed downwards and inserted into the anti-withdrawing ring, the punch is rotated to enable the anti-withdrawing ring to expand outwards, and therefore the anti-withdrawing ring is fixed in the through hole of the front neck circuit board main body.
As a preferred technical solution of the present invention, the assembling method specifically includes:
the punch is vertically inserted into the anti-withdrawal ring and then rotates for 180 degrees, along with the rotation of the head of the punch, the two ends of the first half ring piece and the second half ring piece deform and are clamped into the boss surface, and therefore the anti-withdrawal ring is fixed in the through hole of the front neck circuit board main body.
Compared with the prior art, the invention has the beneficial effects that:
the drift head that traditional installation prevented moving back the ring is the back taper structure, and in the installation, the drift directly pushed down makes the drill way periphery wall of preventing moving back the ring produce the deformation of falling the splayed, reaches the underreamed effect of riveting. The riveting method has the advantages that the effect of riveting and reaming is achieved mainly due to the inverted splayed deformation, the plastic deformation amount is small, the contact surface between the through hole of the neck front circuit board main body and the anti-withdrawal ring is small, and the orifice of the anti-withdrawal ring is easy to deform and shrink under long-time stress, so that the anti-withdrawal ring falls off, and finally the screw is loosened. The invention changes the head structure of the punch from the inverted cone shape into the cylindrical structure with a runway-shaped section or an oval section, the punch extends into the anti-receding ring, the punch rotates for a circle to cause the outer peripheral wall of the anti-receding ring to be integrally expanded and deformed under the action of a couple, and the outer wall of the anti-receding ring is riveted with the inner wall of the through hole of the front neck circuit board main body, so that the anti-receding ring is fixed with the front neck circuit board main body.
Drawings
FIG. 1 is a diagram illustrating the assembly process of an anti-back-out ring according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the mounting relationship between a fastener and a body of a cervical plate according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a punch according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of an anti-backing ring according to an embodiment of the present invention;
fig. 5 is a view illustrating an assembly process of an anti-slip ring according to an embodiment of the present invention.
Wherein, 1-a punch; 11-a force application rod; 12-a support bar; 13-a head; 2-the anterior cervical plate body; 3-a fixing piece; 31-fixing the groove; 4-anti-ring-back; 41-a base; 42-a first half ring member; 43-second half ring member.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In one embodiment, the invention provides an assembly kit for installing an anti-back-out ring 4, as shown in fig. 1 and 5, the assembly kit comprises a fixing piece 3 and a punch 1 which are used in cooperation, a fixing groove 31 (as shown in fig. 2) for fixing a cervical anterior plate body 2 is formed in the fixing piece 3, and further, the fixing groove 31 is a stepped groove.
The head 13 of the punch 1 is a columnar structure with a runway-shaped section or an oval section (as shown in fig. 3, the head 13 of the punch 1 is a columnar structure with a runway-shaped section), the anti-withdrawal ring 4 is placed in the through hole of the anterior cervical plate main body 2, the punch 1 is pressed down and inserted into the anti-withdrawal ring 4, and the punch 1 is rotated to enable the anti-withdrawal ring 4 to expand outwards so as to be fixed in the through hole of the anterior cervical plate main body 2.
As shown in fig. 4, the retaining ring 4 axially penetrates therethrough, and the retaining ring 4 includes a base 41 and a snap ring which are integrally formed. The through-hole of neck front plate main part 2 is the notch cuttype through-hole, pushes down the direction along drift 1 and divide into first ladder hole and second ladder hole, and the diameter of first ladder hole is less than the diameter of second ladder hole. The anti-back ring 4 is inserted into the through hole, the base 41 is embedded into the second stepped hole, and the snap ring is embedded into the first stepped hole. A clamp spring is arranged between the base 41 and the platform ring surface of the second stepped hole.
As shown in fig. 4, the snap ring comprises a first half ring member 42 and a second half ring member 43, the concave surface of the first half ring member 42 and the concave surface of the second half ring member 43 are opposite to each other to form an annular structure, and gaps are left between two ends of the first half ring member 42 and two ends of the second half ring member 43. The outer circumferential ring surface of the first stepped hole is provided with a convex table surface, the punch 1 is inserted into the anti-withdrawal ring 4 and then rotates, so that the two ends of the first half ring member 42 and the second half ring member 43 are deformed and clamped into the convex table surface, and the anti-withdrawal ring 4 is fixed in the through hole of the front neck circuit board main body 2.
The punch 1 further comprises a punch 1 rod, a head 13 is arranged at one end of the punch 1 rod, and the height of the head 13 is larger than or equal to that of the clamping ring. The punch 1 comprises a support rod 12 and a force application rod 11, the support rod 12 and the force application rod 11 are arranged in a cross mode, a head 13 is fixed at one end of the support rod 12, and the punch 1 is rotated through the force application rod 11.
The side surface of the fixing part 3 facing the punch 1 is beveled so that the anti-back ring 4 is perpendicular to the punch 1. Further, as shown in fig. 5, the bottom surface of the fixing member 3 is composed of a plane and an inclined surface which are butted with each other, and the plane and the inclined surface are butted in a convex shape, wherein the plane is horizontally arranged, and one end of the fixing member 3 where the inclined surface is located is tilted, so that the fixing member 3 is inclined toward one side surface of the punch 1.
In another embodiment, the present invention provides an assembling method for installing an anti-back-out ring 4 by using the assembling kit provided in the above embodiment, the assembling method includes:
the punch 1 is vertically inserted into the anti-backing ring 4 and then rotates 180 degrees, along with the rotation of the head 13 of the punch 1, the two ends of the first half ring piece 42 and the second half ring piece 43 deform and are clamped into the boss surface, and therefore the anti-backing ring 4 is fixed in the through hole of the front neck circuit board main body 2.
It should be noted that the anti-back ring 4 provided by the present invention is used for preventing the screw driven into the front neck plate body 2 from loosening and even falling off in the vibration extrusion process, and taking fig. 1 as an example, a specific implementation manner of the anti-back ring 4 on the anti-back function is exemplified: the fixed neck preceding circuit board main part 2 in fig. 1 is totally divided into 6 through-holes, only two middle through-hole internal fixations have the anti-moving ring 4, the fixed mode of the anti-moving ring 4 can be seen in the above-mentioned specific embodiment, all the other 4 through-holes have the screw of driving into, therefore, every both sides of the anti-moving ring 4 are all provided with a screw, can see out by fig. 4, an arc-shaped notch has been seted up to the base 41 one side of the anti-moving ring 4, an arc-shaped notch has been seted up to the same symmetry of opposite side, after the anti-moving ring 4 is fixed in the fixed neck preceding circuit board main part 2, the arc-shaped notch of both sides can support the screw of the anti-moving ring 4 both sides, thereby further.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The utility model provides an assembly external member for installing prevent moving back ring, a serial communication port, the assembly external member including the mounting and the drift that the cooperation was used, the mounting in seted up the fixed recess that is used for fixed neck front road board main part, the head of drift is runway type cross-section or oval cross-section's columnar structure, prevents moving back the ring and puts into the through-hole of neck front road board main part, the drift pushes down and inserts and prevent moving back in the ring, rotatory drift makes to prevent moving back the ring and expands outward to be fixed in the through-hole of neck front road board main part.
2. The assembly kit according to claim 1, wherein the anti-retreat ring is axially through and comprises a base and a snap ring which are integrally formed, the through hole of the neck front plate body is a stepped through hole and is divided into a first stepped hole and a second stepped hole along the downward pressing direction of the punch, the diameter of the first stepped hole is smaller than that of the second stepped hole, the anti-retreat ring is inserted into the through hole, the base is embedded into the second stepped hole, and the snap ring is embedded into the first stepped hole;
preferably, a clamp spring is arranged between the base and the platform ring surface of the second step hole.
3. The assembly kit of claim 2, wherein the snap ring comprises a first half ring member and a second half ring member, the concave surface of the first half ring member and the concave surface of the second half ring member are opposite to each other to form an annular structure, and gaps are reserved between two ends of the first half ring member and two ends of the second half ring member.
4. The assembly kit of claim 3, wherein a raised table is provided on the outer circumferential surface of the first stepped hole, and the punch is inserted into the anti-backing ring and then rotated, so that the two ends of the first half-ring and the second half-ring are deformed and clamped into the raised table, thereby fixing the anti-backing ring in the through hole of the front neck plate body.
5. The assembly kit of any of claims 1-4, wherein the punch further comprises a punch stem, one end of the punch stem being provided with the head;
preferably, the punch rod comprises a support rod and a force application rod, the support rod and the force application rod are arranged in a cross manner, the head is fixed at one end of the support rod, and the punch is rotated through the force application rod.
6. The assembly kit of any of claims 1-5, wherein the head has a height that is greater than or equal to a height of the snap ring.
7. The assembly kit of any of claims 1-6, wherein the retaining groove is a stepped groove;
the surface of one side of the fixing piece facing the punch is an inclined surface, so that the plane of the anti-return ring is perpendicular to the axis of the support rod of the punch.
8. The assembly kit of any one of claims 1 to 7, wherein the bottom surface of the fixing member is composed of a flat surface and an inclined surface which are butted with each other, the flat surface and the inclined surface are butted in a convex shape, the flat surface is horizontally arranged, and one end of the fixing member where the inclined surface is located is tilted so that the fixing member is inclined toward one side surface of the punch.
9. An assembly method for installing an anti-back-out ring using the assembly kit of any of claims 1-8, the assembly method comprising:
the punch is pressed downwards and inserted into the anti-withdrawing ring, the punch is rotated to enable the anti-withdrawing ring to expand outwards, and therefore the anti-withdrawing ring is fixed in the through hole of the front neck circuit board main body.
10. The assembly method according to claim 9, characterized in that it comprises in particular:
the punch is vertically inserted into the anti-withdrawal ring and then rotates for 180 degrees, along with the rotation of the head of the punch, the two ends of the first half ring piece and the second half ring piece deform and are clamped into the boss surface, and therefore the anti-withdrawal ring is fixed in the through hole of the front neck circuit board main body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110448529.XA CN113059067A (en) | 2021-04-25 | 2021-04-25 | An assembly kit for installing an anti-return ring and an assembly method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110448529.XA CN113059067A (en) | 2021-04-25 | 2021-04-25 | An assembly kit for installing an anti-return ring and an assembly method thereof |
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| CN214719980U (en) * | 2021-04-25 | 2021-11-16 | 宁波兆盈医疗器械有限公司 | Assembly kit for installing anti-withdrawal ring |
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