CN211355837U

CN211355837U - Positioning nail implanting device

Info

Publication number: CN211355837U
Application number: CN201921163650.2U
Authority: CN
Inventors: 杨柳; 陈旭; 鲍野
Original assignee: Tianjin Zhengtian Medical Instrument Co Ltd
Current assignee: Tianjin Zhengtian Medical Instrument Co Ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-08-28
Anticipated expiration: 2029-07-23

Abstract

The utility model discloses a positioning nail implanter, which relates to the technical field of medical apparatus and instruments, wherein the positioning nail implanter comprises an implanting part and a handheld part; one end of the implantation part is detachably connected with the positioning nail, and the other end of the implantation part is fixedly connected with the handheld part; the handheld portion includes handle and tail cap, handle one end with the portion of implanting is connected, the other end of handle is provided with the jack catch, circumference is provided with the round draw-in groove on the inner wall of tail cap, the jack catch can with the draw-in groove joint can be followed the draw-in groove rotates. The utility model discloses when well portion of implanting implants the location nail to the bone, the handle drives the portion of implanting and rotates, and the tail cap can keep not rotating relatively with operator's hand, has avoided the friction between tail cap and the operator hand, and it is more convenient, nimble to use, is favorable to reducing the operation time.

Description

Positioning nail implanting device

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to location nail implantation device for spinal surgery.

Background

The spine is formed by connecting thirty-three vertebrae, ligaments, joints and intervertebral discs. The upper end of the spine supports the skull, the lower hip bone, the middle rib and the back wall of the thorax, the abdominal cavity and the pelvic cavity. The spine, an important component of the human body, has functions of supporting the trunk, protecting the internal organs, protecting the spinal cord, and performing exercise. When the spine is injured and surgery is required, positioning is the most basic and important step, because positioning errors can cause the spine to fail to perform the intended function.

At present, a positioning nail implanter is needed to be adopted when the positioning nail is implanted in the spine operation, and then the positioning is carried out in an X-ray developing mode. The positioning nail implanter in the prior art comprises a handheld part and an implanting rod, wherein the handheld part and the implanting rod are of an integrated structure. During the operation, the doctor needs one hand to press the hand-held end to keep the implanter at the corresponding operation position, and the other hand continuously rotates the implanter to drive the positioning nail to drill into the bone. However, in the above operation process, when one hand presses the end of the hand-held portion and the other hand rotates the hand-held portion, friction is generated between the hand-held portion and the hand, which causes discomfort and even injury to the hand of a patient, thereby causing difficulty in operation of a doctor and increasing operation time.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the positioning nail implanting device is provided, and the convenience of operation of doctors in the spinal surgery process is improved by arranging the positioning nails, the locking beads, the implanting rod, the handheld part and the like.

The utility model provides a location nail implantation device, include: an implant portion and a hand-held portion;

one end of the implantation part is detachably connected with the positioning nail, and the other end of the implantation part is fixedly connected with the handheld part;

the handheld portion includes handle and tail cap, handle one end with the portion of implanting is connected, the other end of handle is provided with the jack catch, circumference is provided with the round draw-in groove on the inner wall of tail cap, the jack catch can with the draw-in groove joint can be followed the draw-in groove rotates.

As a preferable scheme of the above positioning nail implanter, the jaw comprises a strip-shaped main body, wherein a protrusion is arranged at one end of the main body, which is far away from the handle, and the protrusion can be clamped into the clamping groove.

As an optimal scheme of above-mentioned location nail implantation device, the other end of handle still is provided with the direction boss, there is the step face between direction boss and the handle, the free end of direction boss is provided with the jack catch, works as the tail cap with during the jack catch joint, the inner wall of the open end of tail cap with the laminating of the lateral wall of direction boss, the terminal surface butt of the open end of tail cap is in on the step face.

As a preferable scheme of the above positioning nail implanter, the outer surface of the closed end of the tail cap is in a circular arc shape.

As an optimal scheme of above-mentioned location nail implanter, the location nail is including the nail body and the connecting portion that are connected, connecting portion with portion of implanting can dismantle the connection, connecting portion are including preventing revolving joint and connecting rod, prevent revolving the articulate the nail body with the connecting rod, portion of implanting is including preventing revolving the groove, prevent revolving the groove and being located portion of implanting is connected the one end of location nail, prevent revolving the joint with prevent revolving the groove cooperation, can prevent portion of implanting with the location nail rotates relatively, be provided with the recess on the connecting rod, be provided with the locking pearl in the portion of implanting, the locking pearl can partly block in or deviate from the recess.

As a preferable aspect of the above-described staple positioning implanter, the implanting portion includes:

the anti-rotation groove is formed in one end of the implantation rod, the other end of the implantation rod is connected with the handle, a connecting hole is formed in one end, close to the anti-rotation groove, of the implantation rod, the connecting rod can stretch into the connecting hole, a containing groove of the stop bead is formed in the side wall of the connecting hole, the containing groove is communicated with the outer surface of the implantation rod and the inner surface of the connecting hole, after the connecting rod is arranged in the connecting hole, the containing groove is opposite to the groove, and the stop bead can be partially clamped into the groove;

the pull sleeve is sleeved on the implant rod and can move along the length direction of the implant rod, a limiting groove is formed in the inner wall of the pull sleeve and used for limiting the stop bead to be separated from the outer side of the implant rod, the limiting groove is of a stepped structure and comprises a first groove and a second groove, the depth of the first groove is smaller than that of the second groove, the sum of the depth of the second groove and the depth of the accommodating groove is equal to the diameter of the stop bead, and the sum of the depth of the first groove, the depth of the accommodating groove and the depth of the groove is equal to the diameter of the stop bead.

As an optimal scheme of above-mentioned nail implantation device in location, the holding tank includes first hole and the second hole that link up each other, first hole is close to the internal surface setting of connecting hole, the second hole is close to the surface setting of implanting the pole, the second hole with the coaxial setting in first hole, the internal surface in first hole is the sphere, works as locking pearl card is gone into during the recess, the surface of locking pearl with the internal surface laminating in first hole.

As an optimal scheme of the above positioning nail implanter, the number of the stop beads is two, the number of the accommodating grooves is two, and the two accommodating grooves are symmetrically arranged on the side wall of the connecting hole.

As an optimal scheme of above-mentioned location nail implantation device, the handle with the one end that the implantation pole is connected is provided with the shoulder hole, the shoulder hole includes third hole and fourth hole, the internal diameter of third hole is less than the internal diameter of fourth hole, just fourth hole sets up and is keeping away from the one end of tail cap, the implantation pole stretches into in the third hole and with the handle pin joint, draw the cover to be close to the one end of handle stretches into in the fourth hole, just third hole with step face between the fourth hole with be provided with compression spring between the terminal surface of this end of draw the cover.

As a preferable mode of the above positioning nail implanter, a stop ring is disposed on an outer surface of one end of the implantation rod away from the handle, and is used for limiting a movement range of the pull sleeve in a direction away from the handle.

The utility model discloses a location nail implanter, including handle and tail cap, can realize rotating relatively when handle and tail cap are connected, can make at the operation in-process, when implanting the location nail to the bone in implantation portion, the handle drives implantation portion and rotates, and the tail cap can keep not rotating relatively with operator's hand, has avoided the friction between tail cap and the operator hand, and it is more convenient, nimble to use, is favorable to reducing the operation time.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Further features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, which is to be read in connection with the accompanying drawings, which are briefly described as follows. It is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural view of a positioning nail implanter according to an embodiment of the present invention;

FIG. 2 is a schematic view of a handle (not shown) of the staple implanter according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a tail cap of a nail positioning implanter according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a positioning nail according to an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 1 at A;

fig. 6 is a schematic structural view of an implantation rod according to an embodiment of the present invention;

FIG. 7 is an enlarged view of a portion of FIG. 6 at B;

fig. 8 is a schematic structural view of the pull sleeve provided by the embodiment of the present invention.

In the figure: 1. a handle; 11. a guide boss; 12. a claw; 13. a protrusion; 14. a third aperture; 15. a fourth aperture;

2. a tail cap; 21. a card slot;

3. positioning nails; 31. a nail body; 32. an anti-rotation joint; 33. a connecting rod; 331. a groove;

4. implanting a rod; 41. a rotation prevention groove; 42. connecting holes; 43. accommodating grooves; 431. a first hole; 432. a second hole; 44. a baffle ring;

5. pulling the sleeve; 51. a limiting groove; 511. a first groove; 512. a second groove; 513. a third groove; 52. a snap ring; 53. a compression spring;

6. a stop bead.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technique can be applied to spinal column positioning operation processes such as spinal column sprain, spinal column strain and the like, and the utility model is introduced in detail below.

The present embodiments provide a positioning nail implanter including an implantation portion and a hand-held portion. Implant portion one end and location nail 3 and can dismantle the connection, the other end and handheld portion fixed connection.

In this embodiment, the handheld portion includes handle 1 and tail cap 2, and handle 1 one end is connected with the portion of implanting, and the other end of handle 1 is provided with direction boss 11, and direction boss 11 is cylindric and the free end of direction boss 11 is provided with a plurality of jack catchs 12, and jack catchs 12 include rectangular form main part, and the one end that the handle 1 was kept away from to the main part is provided with arch 13. The inner wall of the tail cap 2 is circumferentially provided with a circle of clamping grooves 21, and the protrusions 13 of the clamping jaws 12 can be clamped with the clamping grooves 21 and can move along the clamping grooves 21. There is a step surface between the guide boss 11 and the handle 1. When the tail cap 2 is clamped with the clamping jaw 12, the inner wall of the opening end of the tail cap 2 is attached to the side wall of the guide boss 11, the end face of the opening end of the tail cap 2 is abutted to the step face, and the tail cap 2 is guided to rotate relative to the handle 1 and the rotating stability of the tail cap 2 is improved.

In the present embodiment, the plurality of claws 12 are uniformly distributed along the circumferential direction of the handle 1. And the jaws 12 are elastic, thereby facilitating the installation of the jaws 12 into the tail cap 2.

In this embodiment, the blind end external surface of tail cap 2 is circular-arc, and when tail cap 2 was pressed to the hand, this circular-arc blind end can provide more comfortable experience, avoids causing the discomfort to the operator.

In this embodiment, the handle 1 includes a handle body connected to the implant portion and a sheath fitted over the handle body.

The cooperation structure of handle 1 and tail cap 2 among this embodiment can be so that at the operation in-process, when the portion of implanting implants 3 to the intraosseous location nail, handle 1 drives the portion of implanting and rotates, and tail cap 2 can keep not rotating relatively with operator's hand, has avoided the friction between tail cap 2 and the operator hand, and it is more convenient, nimble to use.

In this embodiment, the positioning nail 3 to be implanted includes a nail body 31 and a connecting portion, the connecting portion is detachably connected to the implanted portion, the connecting portion includes a rotation preventing joint 32 and a connecting rod 33, and the rotation preventing joint 32 connects the nail body 31 and the connecting rod 33. Wherein the anti-rotation joint 32 has a hexagonal structure. The connecting rod 33 is provided with a recess 331.

Corresponding to the structure of the connecting portion of location nail 3, the portion of implanting is provided with prevents revolving groove 41, prevents revolving groove 41 and is located the one end that the portion of implanting connects location nail 3, and is interior hexagonal structure, prevents revolving joint 32 and can block into preventing revolving groove 41, prevents revolving groove 41 internal surface and prevents revolving joint 32's surface laminating, when implanting location nail 3, can drive location nail 3 synchronous rotation through the portion of implanting to in revolving the bone with location nail 3.

In other manners, the anti-rotation joint 32 may have a square structure, a quincuncial structure, or other structures, and the corresponding anti-rotation groove 41 may have an inner square structure, an inner quincuncial structure, or other corresponding structures, so as to prevent the positioning pin 3 from rotating relative to the implanted portion.

The implant part is provided with a stop bead 6, and the stop bead 6 can be partially clamped into or separated from the groove 331 on the connecting rod 33, so that the implant part and the positioning nail 3 can be connected or separated. To ensure a simplified operation and to ensure a correct assembly of the retaining bead 6 and the indentation 331, the indentation 331 is a groove arranged around the circumference of the implant rod 4.

Specifically, the implantation part comprises an implantation rod 4 and a pull sleeve 5, wherein one end of the implantation rod 4 is provided with an anti-rotation groove 41, and the other end of the implantation rod is fixedly connected with the handle 1. Implant pole 4 and be close to the one end of preventing revolving groove 41 and be provided with connecting hole 42, prevent revolving groove 41 and connecting hole 42 intercommunication, and there is the step face between the two, connecting rod 33 can stretch into in the connecting hole 42, set up the holding tank 43 of locking pearl 6 on the lateral wall of connecting hole 42, the outside surface of implanting pole 4 and the internal surface of connecting hole 42 are connected to holding tank 43, connecting rod 33 packs into in the connecting hole 42 back, prevent revolving joint 32 card in preventing revolving groove 41 and support on the step face, holding tank 43 is relative with recess 331, locking pearl 6 can partly block in recess 331, thereby realize connecting rod 33 and implant pole 4's connection.

The pull sleeve 5 is sleeved on the implantation rod 4 and can move along the length direction of the implantation rod 4, and a limiting groove 51 is arranged on the inner wall of the pull sleeve 5 and used for limiting the stop bead 6 to be separated from the outside of the implantation rod 4. The limiting groove 51 is of a stepped structure and comprises a first groove 511 and a second groove 512, the depth of the first groove 511 is smaller than that of the second groove 512, the sum of the depth of the second groove 512 and the depth of the accommodating groove 43 is equal to the diameter of the stop bead 6, and the sum of the depth of the first groove 511, the depth of the accommodating groove 43 and the depth of the groove 331 is equal to the diameter of the stop bead 6. Specifically, a third groove 513 is further provided between the first groove 511 and the second groove 512, the third groove 513 connects the first groove 511 and the second groove 512, and the depth of the third groove 513 gradually increases in the direction from the first groove 511 to the second groove 512. In order to achieve a corresponding fit with the recess 331, the first groove 511, the second groove 512, and the third groove 513 are each a groove provided in one turn in the circumferential direction of the inner wall of the pull sleeve 5. In the present embodiment, the first groove 511 is provided on the side of the third groove 513 closer to the handle 1, and the second groove 512 is provided on the side of the third groove 513 farther from the handle 1.

In order to ensure that the retaining bead 6 does not fall off the receiving groove 43 on the inner surface of the implant rod 4, the receiving groove 43 includes a first hole 431 and a second hole 432 which are mutually communicated, the first hole 431 is arranged close to the inner surface of the connecting hole 42, the second hole 432 is arranged close to the outer surface of the implant rod 4, the second hole 432 is coaxially arranged with the first hole 431, the inner surface of the first hole 431 is spherical, when the retaining bead 6 is clamped into the groove 331, the outer surface of the retaining bead 6 is attached to the inner surface of the first hole 431, and therefore, the retaining bead 6 cannot fall off in the connecting hole 42.

The number of the stop beads 6 is two, the number of the accommodating grooves 43 is two, and the two accommodating grooves 43 are symmetrically arranged on the side wall of the connecting hole 42, specifically, the axes of the two accommodating grooves 43 are intersected with the axis of the connecting hole 42, so that the connecting stress of the positioning nail 3 and the implantation rod 4 is balanced, and the connection is stable.

The connection relationship between the handle 1 and the implant is described in detail below: the handle 1 is provided with the shoulder hole with the one end that implants pole 4 and is connected, and this shoulder hole includes third hole 14 and fourth hole 15, and the internal diameter of third hole 14 is less than the internal diameter of fourth hole 15, and fourth hole 15 sets up the one end of keeping away from tail cap 2. The implantation rod 4 extends into the third hole 14 from the fourth hole 15 and is in pin joint with the handle 1, and the diameter of the implantation rod 4 is the same as the inner diameter of the third hole 14, so that the implantation rod 4 is prevented from shaking relative to the handle 1. One end of the pull sleeve 5 close to the handle 1 extends into the fourth hole 15, a compression spring 53 is arranged between the step surface between the third hole 14 and the fourth hole 15 and the end surface of the end of the pull sleeve 5, and the compression spring 53 is sleeved on the implantation rod 4. The compression spring 53 causes the pull cup 5 to tend to move away from the handle 1.

The outer surface of the end of the implantation rod 4 away from the handle 1 is provided with a stop ring 44 for limiting the movement range of the pull sleeve 5 in the direction away from the handle 1.

The side wall of one end of the pull sleeve 5 close to the handle 1 is provided with a snap ring 52, so that an operator can conveniently pull the pull sleeve 5 to axially move along the implantation rod 4 through the snap ring 52.

When the positioning nail 3 is connected with the implant part, when the connecting rod 33 of the positioning nail 3 extends into the connecting hole 42 of the implant rod 4, the snap ring 52 needs to be pulled first to enable the pull sleeve 5 to move towards one side close to the handle 1 and enable the second groove 512 to be aligned with the accommodating groove 43, the stop bead 6 moves towards the direction of the pull sleeve 5 under the extrusion of the side wall of the connecting rod 33, at the moment, the stop bead 6 is located in the accommodating groove 43 and the second groove 512, as the groove 331 is aligned with the accommodating groove 43, the stop bead 6 is partially clamped into the groove 331, meanwhile, the snap ring 52 is released, the pull sleeve 5 moves towards one side far away from the handle 1 under the action of the compression spring 53, the first groove 511 is aligned with the accommodating groove 43, the stop bead 6 is clamped in the accommodating groove 43 and the groove 331 through the inner wall of the first groove 511. When the positioning nail 3 needs to be separated from the implantation rod 4, the snap ring 52 needs to be pulled first to enable the pull sleeve 5 to move towards the side close to the handle 1, so that the second groove 512 is aligned with the accommodating groove 43, then the implantation rod 4 moves towards the direction far away from the positioning nail 3, the stop bead 6 gradually leaves the groove 331 and is pressed into the accommodating groove 43 and the second groove 512 by the connecting rod 33, after the connecting rod 33 leaves the position of the accommodating groove 43, the snap ring 52 is released, and the stop bead 6 is still pressed into the accommodating groove 43 by the first groove 511 in the pull sleeve 5 and partially protrudes out of the inner wall of the implantation rod 4.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A positioning staple implanter, comprising: an implant portion and a hand-held portion;

one end of the implantation part is detachably connected with the positioning nail (3), and the other end of the implantation part is fixedly connected with the handheld part;

the handheld portion includes handle (1) and tail cap (2), handle (1) one end with the portion of implanting is connected, the other end of handle (1) is provided with jack catch (12), circumference is provided with round draw-in groove (21) on the inner wall of tail cap (2), jack catch (12) can with draw-in groove (21) joint can be followed draw-in groove (21) rotate.

2. A positioned nail implanter according to claim 1, characterized in that the jaws (12) comprise an elongated body, the end of which remote from the handle (1) is provided with a projection (13), the projection (13) being capable of snapping into the snap-in groove (21).

3. An implanter with positioning nails according to claim 1, characterized in that the other end of the handle (1) is further provided with a guide boss (11), a step surface is arranged between the guide boss (11) and the handle (1), the free end of the guide boss (11) is provided with the jaw (12), when the tail cap (2) is clamped with the jaw (12), the inner wall of the opening end of the tail cap (2) is attached to the side wall of the guide boss (11), and the end face of the opening end of the tail cap (2) is abutted to the step surface.

4. The positional nail implanter according to claim 1, characterized in that the outer surface of the closed end of the tail cap (2) is rounded.

5. The positional nail implanter of any of claims 1-4, the positioning nail (3) comprises a nail body (31) and a connecting part which are connected, the connecting part is detachably connected with the implantation part, the connecting part comprises an anti-rotation joint (32) and a connecting rod (33), the anti-rotation joint (32) is connected with the nail body (31) and the connecting rod (33), the implantation part comprises an anti-rotation groove (41), the anti-rotation groove (41) is positioned at one end of the implantation part connected with the positioning nail (3), the anti-rotation joint (32) is matched with the anti-rotation groove (41) and can prevent the relative rotation of the implantation part and the positioning nail (3), the connecting rod (33) is provided with a groove (331), the implantation part is provided with a stop bead (6), the retaining bead (6) can be partially snapped into or out of the recess (331).

6. The positional nail implanter of claim 5, wherein said implant portion comprises:

the anti-rotation handle comprises an implantation rod (4), wherein one end of the implantation rod (4) is provided with a rotation preventing groove (41), the other end of the implantation rod (4) is connected with the handle (1), one end, close to the rotation preventing groove (41), of the implantation rod (4) is provided with a connecting hole (42), a connecting rod (33) can extend into the connecting hole (42), the side wall of the connecting hole (42) is provided with an accommodating groove (43) of a stop bead (6), the accommodating groove (43) is communicated with the outer surface of the implantation rod (4) and the inner surface of the connecting hole (42), after the connecting rod (33) is arranged in the connecting hole (42), the accommodating groove (43) is opposite to the groove (331), and the stop bead (6) can be partially clamped into the groove (331);

the pull sleeve (5) is sleeved on the implantation rod (4) and can move along the length direction of the implantation rod (4), a limiting groove (51) is formed in the inner wall of the pull sleeve (5) and used for limiting the stop bead (6) to be separated from the outer side of the implantation rod (4), the limiting groove (51) is of a stepped structure and comprises a first groove (511) and a second groove (512), the depth of the first groove (511) is smaller than that of the second groove (512), the sum of the depth of the second groove (512) and the depth of the accommodating groove (43) is equal to the diameter of the stop bead (6), and the sum of the depth of the first groove (511), the depth of the accommodating groove (43) and the depth of the groove (331) is equal to the diameter of the stop bead (6).

7. A nail implanter according to claim 6, wherein said housing groove (43) comprises a first hole (431) and a second hole (432) penetrating each other, said first hole (431) being provided near an inner surface of said attachment hole (42), said second hole (432) being provided near an outer surface of said implantation rod (4), said second hole (432) being provided coaxially with said first hole (431), an inner surface of said first hole (431) being spherical, and an outer surface of said stop bead (6) being in abutment with an inner surface of said first hole (431) when said stop bead (6) is snapped into said recess (331).

8. The positional nail implanter according to claim 6, characterized in that said stop beads (6) are two, said receiving grooves (43) are correspondingly two, and said two receiving grooves (43) are symmetrically disposed on the side wall of said connecting hole (42).

9. A tack implanter according to claim 6, characterized in that the end of the handle (1) connected to the implantation rod (4) is provided with a stepped bore comprising a third bore (14) and a fourth bore (15), the third bore (14) having an internal diameter smaller than the internal diameter of the fourth bore (15), and the fourth bore (15) being provided at the end remote from the tail cap (2), the implantation rod (4) extending into the third bore (14) and being pinned to the handle (1), the end of the pull sleeve (5) close to the handle (1) extending into the fourth bore (15), and a compression spring (53) being provided between the step surface between the third bore (14) and the fourth bore (15) and the end surface of the end of the pull sleeve (5).

10. The positional nail implanter according to claim 9, characterized in that a stop ring (44) is provided on the outer surface of the end of the implantation rod (4) remote from the handle (1) for limiting the range of movement of the pull sleeve (5) in the direction away from the handle (1).