WO2021259066A1

WO2021259066A1 - Laminectomy punch

Info

Publication number: WO2021259066A1
Application number: PCT/CN2021/099194
Authority: WO
Inventors: Owen XING; Markus Nesper; Victor Huang
Original assignee: Aesculap Ag; Owen XING
Priority date: 2020-06-24
Filing date: 2021-06-09
Publication date: 2021-12-30

Abstract

The present invention relates to the technical field of medical instruments, and in particular, to a laminectomy punch. The laminectomy punch includes a main body provided with a slide rail, a slide bar connected to the main body and a movable handle, where a cutting edge is disposed at the front end of the main body, and the movable handle abuts against the slide bar and can push the slide bar to move along the slide rail, and the laminectomy punch also includes a locking structure arranged on the main body and used to switch a working state or a disassembled state of the laminectomy punch; the locking structure includes a first state and a second state; when the locking structure is in the first state, the movable handle keeps abutting against the slide bar under the limiting action of the locking structure, and the slide bar can move normally along the slide rail, in which case the laminectomy punch is in the working state; and when the locking structure is in the second state, the movable handle can move downwards, the front end of the slide bar lifts up and is separated from the movable handle, the slide bar is away from the slide rail, in which case the laminectomy punch is in the disassembled state. The laminectomy punch of the present invention is easy to disassemble, clean and disinfect, and can be cleaned without being disassembled into components, thereby solving the problem that components are easy to lose.

Description

LAMINECTOMY PUNCH

TECHNICAL FIELD

The present invention relates to the technical field of, and in particular, to a laminectomy punch.

BACKGROUND ART

Laminectomy punches are mainly applied to clinical operations, especially neurosurgical operations, for punching tiny bones and soft tissues. At present, laminectomy punches for clinical use have the following problems.

Most of traditional laminectomy punches cannot be disassembled, and can only be cleaned as a whole. However, in the processes of operations, bone residues and tissues and the like often remain in gaps of laminectomy punches, and are difficult to clean thoroughly, thus, the long-term use of the traditional laminectomy punches easily causes serious consequences such as cross infection and the like.

There are also some laminectomy punches on the market that cannot be disassembled, but they can be cleaned only after being disassembled into components, and have certain requirements for placement position. When a stack of surgical instruments are cleaned and disinfected, is required for finding matched components, and a risk of loss also exists, thereby seriously affecting the effectiveness and efficiency of working.

SUMMARY OF THE INVENTION

The present invention provides a laminectomy punch which is easy to disassemble, clean and disinfect, and can be cleaned without being disassembled into components, thereby solving the problem that components are easy to lose.

In order to solve the technical problems above, the technical solution adopted by the present invention is as follows:

a laminectomy punch is provided, which includes a main body provided with a slide rail, a slide bar connected to the main body and a movable handle, where a cutting edge is disposed at the front end of the main body, and the movable handle abuts against the slide bar and can push the slide bar to move along the slide rail, and the laminectomy punch further includes a locking structure arranged on the main body and used to switch a working state or a disassembled state of the laminectomy punch;

the locking structure includes a first state and a second state; and

when the locking structure is in the first state, the movable handle keeps abutting against the slide bar under the limiting action of the locking structure, and the slide bar can move normally along the slide rail, in which case the laminectomy punch is in the working state; and when the locking structure is in the second state, the movable handle can move downwards, the front end of the slide bar lifts up and is separated from the movable handle, and then the slide bar is away from the slide rail, in which case the laminectomy punch is in the disassembled state.

Further, the locking structure includes a button shell, a button and a button securing pin, where the button shell is axially provided with a button inner-hole for placing the button, the button shell is circumferentially provided with a securing pin hole, a first groove and a second groove, the securing pin hole is arranged independent of the first groove and the second groove, and the first groove and the second groove are adjacently arranged along the axial direction of the button shell; and the button securing pin is embedded in the main body and located in the securing pin hole;

the movable handle is provided with a special-shaped boss; and

when the locking structure is in the first state, the button is in an uncompressed state, the special-shaped boss is movably located in the first groove, in which case the laminectomy punch is in the working state; and when the locking structure is in the second state, the button is in a compressed state, the special-shaped boss is located in the second groove, and the movable handle can move downwards along the second groove, in which case the laminectomy punch is in the disassembled state.

Further, the securing pin hole is an elongated through-hole, the length direction of the securing pin hole is parallel to the axial direction of the button shell, and the width of the securing pin hole just matches with the cross-section diameter of the button securing pin;

the size of the first groove matches with the size of the special-shaped boss;

the second groove is an elongated groove arranged along the circumferential direction of the button shell, the second groove is communicated with the first groove, and the length of the second groove is greater than that of the first groove; and

when the button is compressed, the special-shaped boss slides to the second groove from the first groove, and the special-shaped boss can move downwards along the second groove.

Further, the main body is provided with a cheek screw; a strip-shaped hole is disposed at the end of the movable handle that is connected to the main body, and the movable handle is connected to the main body through cooperative crossing of the strip-shaped hole and the cheek screw; and the length direction of the strip-shaped hole matches with the downward-moving direction along the second groove of the special-shaped boss.

As an improvement, a trajectory slot is disposed at the end of the movable handle that is connected to the main body, the trajectory slot is composed of an arc-shaped trajectory slot and a linear trajectory slot which are connected, and the linear trajectory slot is arranged above the arc-shaped trajectory slot; and the main body is provided with a limit pin, and the movable handle makes motion along the trajectory slot by means of the limit pin; and

when the laminectomy punch is in the working state, the limit pin is located in the arc-shaped trajectory slot, and the movable handle makes curvilinear motion along the arc-shaped trajectory slot by means of the limit pin, in which case the movable handle can push the slide bar to move along the slide rail; and when the laminectomy punch is in the disassembled state, the limit pin is located in the linear trajectory slot, and the movable handle makes rectilinear motion along the linear trajectory slot by means of the limit pin, in which case the movable handle can move downwards to separate from the slide bar.

Preferably, a slide bar groove is disposed at the bottom of the slide bar, a bulge is disposed at the joint of the movable handle and the slide bar, the bulge is in contact with the end face of the slide bar groove, and the movable handle pushes the slide bar to move along the slide rail through the rotatable abutment of the bulge and the slide bar groove.

As an improvement, the laminectomy punch also includes a guide structure, the guide structure includes a guide shaft, a guide pressure spring and a guide limit block, where the guide shaft is provided with a securing block at one end and has a free end at the other end, and the guide pressure spring and the guide limit block are sleeved on the guide shaft in sequence; a placement slot located behind the slide rail is disposed at the top of the main body, a front-end locating hole is disposed at the front end of the placement slot, and the front-end locating hole is connected to the securing block by means of a first rotating pin; and a middle locating hole located above the placement slot is disposed at the bottom of the slide bar, and the middle locating hole is connected to the guide limit block by means of a second rotating pin;

when the laminectomy punch is in the working state, the guide shaft is arranged in the placement slot, the two ends of the guide pressure spring are in the compressed state under the action of the securing block and the guide limit block, and the movable handle can push the slide bar to move along the slide rail; and when the laminectomy punch is in the disassembled state, the securing block of the guide shaft keeps connecting to the front-end locating hole, the guide pressure spring resets and pushes the guide limit block which keeps connection with the slide bar, the free end of the guide shaft is separated from the placement slot under the action of resetting of the guide pressure spring, the front end of the slide bar lifts up, and then the slide bar is away from the slide rail.

Preferably, the laminectomy punch also includes a tail limit block, and the tail limit block includes a head, a neck and a sliding part which are successively connected; a limiting inner hole is disposed at the rear end of the bottom of the slide bar, and the head of the tail limit block is in interference fit with the limiting inner hole; and a T-shaped limit slot having a closed end is disposed at the rear end of the top of the main body, the size of the neck of the tail limit block matches with the opening size of the T-shaped limit slot, and the sliding part can be clamped in the T-shaped limit slot and slide along the T-shaped limit slot.

Preferably, an auxiliary boss located at the front end of the limiting inner hole is also disposed at the rear end of the bottom of the slide bar, an arc-shaped inclined surface located at the front end of the T-shaped limit slot is also disposed at the rear end of the top of the main body, and the auxiliary boss can slide along the arc-shaped inclined surface while the front end of the slide bar lifts up.

Preferably, a first T-shaped boss which can move along the slide rail is disposed at the bottom of the slide bar, and a T-shaped groove is disposed at the front end of the bottom of the slide bar; and a second T-shaped boss located behind the cutting edge is disposed at the front end of the top of the main body, and the second T-shaped boss matches with the T-shaped groove.

Compared with the prior art, the laminectomy punch of the present invention can be automatically disassembled, because the locking structure which enables convenient switching of a working state or a disassembled state of the laminectomy punch is arranged on the main body, and after the laminectomy punch is used, just by pressing the locking structure and then pulling down the movable handle, the separation of the slide bar and the slide rail can be realized, that is, the front end of the slide bar lifts up so as to automatically separate from the main body; and when the laminectomy punch is required to be switched back to the working state, just by pressing to push the slide bar, and then pushing up the movable handle to an extreme position, the locking structure resets, so that the laminectomy punch returns to the working state.

With the structural design of the laminectomy punch of the present invention, gaps between the main body and the slide bar can be thoroughly cleaned and disinfected, so that the remaining of bone residues and soft tissues is avoided, the possibility of cross infection is reduced, and the problems that laminectomy punches are difficult and time-consuming to clean, and components are easy to lose, etc. are solved. In addition, the laminectomy punch is simple in disassembling and assembling operations, and strong in practicability.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a first schematic diagram of a working state of a laminectomy punch in an embodiment of the present invention.

Fig. 2 is a second schematic diagram of a working state of a laminectomy punch in an embodiment of the present invention.

Fig. 3 is a schematic diagram of a disassembled state of a laminectomy punch in an embodiment of the present invention.

Fig. 4 is a structural schematic diagram of a slide bar in an embodiment of the present invention.

Fig. 5 is a structural schematic diagram of a main body in an embodiment of the present invention.

Fig. 6 is an exploded schematic diagram of a locking structure in an embodiment of the present invention.

Fig. 7 is a structural schematic diagram of a button shell in an embodiment of the present invention.

Fig. 8 is a structural schematic diagram of a movable handle in an embodiment of the present invention.

Fig. 9 is a partial schematic diagram of a disassembled state of a laminectomy punch in an embodiment of the present invention.

Fig. 10 is a structural schematic diagram of a guide shaft in an embodiment of the present invention.

Fig. 11 is a structural schematic diagram of a guide limit block in an embodiment of the present invention.

Fig. 12 is a structural schematic diagram of a tail limit block in an embodiment of the present invention.

Fig. 13 is a partial schematic diagram of a main body in an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A further explanation of the present invention will be made below in connection with the detailed description of embodiments of the present invention. Therein, the accompanying drawings are only used for exemplary explanation, and just refer to schematic drawings rather than real-object drawings, so they cannot be construed as limitations of this patent; for the better explanation of the embodiments of the present invention, some components in the accompanying drawings may be omitted, enlarged or reduced, and do not represent the sizes of actual products; and for those of ordinary skill in the art, it can be understood that some publicly known structures and descriptions thereof in the accompanying drawings may be omitted.

Same or similar reference numbers in the accompanying drawings of the embodiments of the present invention correspond to same or similar components; and in the description of the present invention, it should be understand that if the orientation or position relations indicated by terms such as "up" "down" , "vertical" , "horizontal" , "transverse" , "longitudinal" and the like refer to the orientation or position relations shown based on the accompanying drawings, the orientation or position relations are only used for facilitating the description of the present invention and the simplification of the description, but not used for indicating or implying that referred devices or elements must be in particular orientations, or constructed and operated in particular orientations, therefore, the terms for describing the position relations in the accompanying drawings are only used for illustrative explanation, and shall not be construed as limitations of the invention.

Moreover, in addition to indicating orientation or position relations, some of the terms mentioned above may be used for indicating other meanings, for example, the term "up" can also be used for indicating some attachment relation or connection relation in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific situations.

In addition, if there are terms such as "first" and "second" and the like which are only used for describing purposes, the terms are primarily used for distinguishing different devices, elements, or components (specific types and structures may be same or different) , but not used for indicating or implying the relative importance and quantities of the indicted devices, elements or components, so the terms cannot be interpreted as indicating or implying the relative importance.

Fig. 1 to Fig. 13 show embodiments of a laminectomy punch of the present invention. The laminectomy punch includes a main body 10 provided with a slide rail 11, a slide bar 20 connected to the main body 10, and a movable handle 30, and further includes a locking structure 40 arranged on the main body 10 and used to switch a working state or a disassembled state of the laminectomy punch. The front end of the main body 10 is provided with a cutting edge 12, and the movable handle 30 abuts against the slide bar 20 and can push the slide bar 20 to move along the slide rail 11; and the locking structure 40 includes a first state and a second state.

As shown in Fig. 1 and Fig. 2, when the locking structure 40 is in the first state, the movable handle 30 keeps abutting against the slide bar 20 under the limiting action of the locking structure 40, and once a user simultaneously holds the main body 10 and the movable handle 30, just by pressing or loosening the movable handle 30, the slide bar 20 can normally move forwards and backwards along the slide rail 11, in which case the laminectomy punch is in the working state;

as shown in Fig. 3, when the locking structure 40 is in the second state, the movable handle 30 can move downwards, and once a user pulls down the movable handle 30 to an extreme position, the movable handle 30 is separated from the slide bar 20, the front end of the slide bar 20 lifts up, and the slide bar 20 is away from the slide rail 11, in which case the laminectomy punch is in the disassembled state.

It should be noted that, in this embodiment, the front end of the laminectomy punch is indicated with reference to the working direction thereof; and for the convenience of operation, the locking structure 40 is generally arranged in the cheek area of the main body 10. The laminectomy punch according to the embodiment of the present invention can be automatically disassembled, because the locking structure 40 which enables convenient switching of the working state or the disassembling state of the laminectomy punch is arranged on the main body 10, and after the laminectomy punch is used, just by pressing the locking structure 40 and then pulling down the movable handle 30, the separation of the slide bar 20 and the slide rail 11 can be realized, that is, the front end of the slide bar 20 lifts up so as to automatically separate from the main body 10; and when the laminectomy punch is required to be switched back to the working state, just by pressing to push the slide bar 20, and then pushing up the movable handle 30 to an extreme position, the locking structure 40 resets, so that the laminectomy punch returns to the working state.

As shown in Fig. 1, Fig. 2, Fig. 6, Fig. 7 and Fig. 8, the locking structure 40 includes a button shell 41, a button pressure spring 42 and a button securing pin 43, where the button shell 41 is axially provided with a button inner-hole 411 for placing the button 42, the button shell 41 is circumferentially provided with a securing pin hole 412, a first groove 413 and a second groove 414, the securing pin hole 412 is arranged independent of the first groove 413 and the second groove 414, and the first groove 413 and the second groove 414 are adjacently arranged along the axial direction of the button shell 41; and the button securing pin 43 is embedded in the main body 10 and located in the securing pin hole 412. As shown in Fig. 8, the movable handle 30 is provided with a special-shaped boss 31. When the locking structure 40 is in the first state, the button 42 is in an uncompressed state, and the special-shaped boss 31 is movably located in the first groove 413, in which case the laminectomy punch is in the working state; and when the locking structure 40 is in the second state, the button 42 is in a compressed state, the special-shaped boss 31 is located in the second groove 414, and the movable handle 30 can move downwards along the second groove 414, in which case the laminectomy punch is in the disassembled state.

That is to say, in actual use, when the laminectomy punch is in the working state, the movable handle 30 is pressed so as to push the slide bar 20 to move forwards, in which case the special-shaped boss 31 on the movable handle 30 is separated from the first groove 413; and when the movable handle 30 is loosened, the slide bar 20 moves backwards to reset, in which case the special-shaped boss 31 on the movable handle 30 is located in the first groove 413;

when the laminectomy punch is switched from the working state to the disassembled state, the movable handle 30 is loosened and the button shell 41 is pressed, then the button shell 41 is embedded in the main body 10 along the securing pin hole 412 under the action of the button securing pin 43, and at the same time, the special-shaped boss 31 on the movable handle 30 enters into the second groove 414 from the first groove 413, and the special-shaped boss 31 can move downwards along the second groove 414, that is, the movable handle 30 can be pulled down to the extreme position; and in this case, the axial position of the button shell 41 is also limited by the special-shaped boss 31, and the button pressure spring 42 is in the compressed state; and

when the laminectomy punch is switched from the disassembled state to the working state, the movable handle 30 is pushed up to the extreme position, that is, the special-shaped boss 31 moves from the downmost end to the upmost end of the second groove 414, in which case the button pressure spring 42 resets, and the special-shaped boss 31 re-enters into the first groove 413 from the second groove 414, that is, the button shell 41 ejects out of the main body 10 along the securing pin hole 412 under the action of the button securing pin 43.

In a preferred embodiment, as shown in Fig. 6 and Fig. 7, the securing pin hole 412 is an elongated through-hole, the length direction of the securing pin hole 412 is parallel to the axial direction of the button shell 41, and the width of the securing pin hole 412 just matches with the cross-section diameter of the button securing pin 43, which makes the pressing and resetting processes of the button shell 41 run more smoothly, and maximizes the function of the button pressure spring 42 and minimizes the mechanical loss. In addition, the size of the first groove 413 matches with the size of the special-shaped boss 31; the second groove 414 is an elongated groove arranged along the circumferential direction of the button shell 41, the second groove 414 is communicated with the first groove 413, and the length of the second groove 414 is greater than that of the first groove 413. It can be understood that, for accommodating the displacement trajectory of the special-shaped boss 31, the first groove 413 should be arranged above the second groove 414, that is, when the button pressure spring 42 is compressed, the special-shaped boss 31 slides from the first groove 413 to the second groove 414, and the special-shaped boss 31 can move downwards along the second groove 414.

As shown in Fig. 1, for facilitating that the movable handle 30 can be pulled down or pushed up while it is securing, the main body 107 can also be provided with a cheek screw 13, a strip-shaped hole 32 is disposed at the end of the movable handle 30 that is connected to the main body 10, the movable handle 30 is connected to the main body 10 through cooperative crossing of the cheek screw 13 and the strip-shaped hole 32, and the length direction of the strip-shaped hole 32 matches with the downward-moving direction along the second groove 414 of the special-shaped boss 31, so that when the movable handle 30 is pulled down, the movable handle 30 is simultaneously limited by the second groove 414 and the strip-shaped hole 32, which makes operations more stable.

As an improved embodiment, a trajectory slot can also be disposed at the end of the movable handle 30 that is connected to the main body 10. As shown in Fig. 8, the trajectory slot is composed of an arc-shaped trajectory slot 33 and a linear trajectory slot 34 which are connected, and the linear trajectory slot 34 is arranged above the arc-shaped trajectory slot 33; and as shown in Fig. 1, the main body 10 is provided with a limit pin 14, and the movable handle 30 makes motion along the trajectory slot by means of the limit pin 14. In actual use, when the laminectomy punch is in the working state, the limit pin 14 is located in the arc-shaped trajectory slot 33, and the movable handle 30 makes curvilinear motion along the arc-shaped trajectory slot 33 by means of the limit pin 14, in which case the slide bar 20 can be pushed to move along the slide rail 11 just by pressing the movable handle 30; and when the laminectomy punch is required to be switched from the working state to the disassembled state, during the processes of pressing the locking structure 40 and pulling down the movable handle 30, the limit pin 14 enters into the linear trajectory slot 34 from the arc-shaped trajectory slot 33, that is, the movable handle 30 makes rectilinear motion along the linear trajectory slot 34 by means of the limit pin 14 so as to realize the pulling-down operation, and the movable handle 30 is separated from the slide bar 20. It can be understood that the linear trajectory slot 34 is arranged above the arc-shaped trajectory slot 33 means that the linear trajectory slot 34 is vertically located above the arc-shaped trajectory slot 33, so as to facilitate the upward and downward movement of the movable handle 30.

As shown in Fig. 1, Fig. 2, Fig. 4 and Fig. 8, a slide bar groove 21 is disposed at the bottom of the slide bar 20, a bulge 35 is disposed at the joint of the movable handle 30 and the slide bar 20, and the bulge 35 is in contact with the end face of the slide bar groove 21. When the laminectomy punch is in the working state, under the limiting action of the locking structure 40, the movable handle 30 cannot move upwards and downwards, and the movable handle 30 can push the slide bar 20 to move along the slide rail 11 through the rotatable abutment of the bulge 35 and the slide bar groove 21; and when the laminectomy punch is required to be switched from the working state to the disassembled state, during the processes of pressing the locking structure 40 and pulling down the movable handle 30, the bulge 35 is separated from the slide bar groove 21, that is, the movable handle 30 is separated from the slide bar 20.

For ensuring that a certain angle can be formed and no disassembly is required when the slide bar 20 away from the slide rail 11 is separated from the main body 10, the laminectomy punch in the embodiment of the present invention also includes a guide structure 50. As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 9, Fig. 10 and Fig. 11, the guide structure 50 includes a guide shaft 51, a guide pressure spring 52 and a guide limit block 53, where the guide shaft 51 is provided with a securing block 511 at one end and has a free end at the other end, and the guide pressure spring 52 and the guide limit block 53 are successively sleeved on the guide shaft 51. And also, a placement slot 15 is disposed behind the slide rail 11 at the top of the main body 10, a front-end locating hole 16 is disposed at the front end of the placement slot 15, and the front-end locating hole 16 is connected to the securing block 511 by means of a first rotating pin 17; and as shown in Fig. 4, a middle locating hole 22 located above the placement slot 15 is disposed at the bottom of the slide bar 20, and the middle locating hole 22 is connected to the guide limit block 53 by means of a second rotating pin 18.

When the laminectomy punch is in the working state, the guide shaft 51 is arranged in the placement slot 15, the two ends of the guide pressure spring 52 are in a compressed state under the action of the securing block 511 and the guide limit block 53, and the movable handle 30 can push the slide bar 20 to move along the slide rail 11; and when the laminectomy punch is in the disassembled state, the securing block 511 of the guide shaft 51 keeps connecting to the front-end locating hole 16, the guide pressure spring 52 resets and pushes the guide limit block 53 keeping connection with the slide bar 20, the free end of the guide shaft 51 is separated from the placement slot 15 under the action of resetting of the guide pressure spring 52, the front end of the slide bar 20 lifts up, and the slide bar 20 is away from the slide rail 11. In other words, the distance between the middle locating hole 22 and the front-end locating hole 16 should be smaller than the length of the guide pressure spring 52 in the uncompressed state, so that when the laminectomy punch is disassembled, the guide pressure spring 52 can reset and push the guide limit block 53.

In addition, as shown in Fig. 1, Fig. 2, Fig. 3, Fig. 9 and Fig. 12, the laminectomy punch also includes a tail limit block 60, and the tail limit block 60 includes a head 61, a neck 62 and a sliding part 63 which are successively connected; a limiting inner hole 23 is disposed at the rear end of the bottom of the slide bar 20, and the head 61 of the tail limit block 60 is in interference fit with the limiting inner hole 23; and a T-shaped limit slot 19 having a closed end is disposed at the rear end of the top of the main body 10, the size of the neck 62 of the tail limit block 60 matches with the opening size of the T-shaped limit slot 19, the size of the sliding part 63 is larger than the size of the neck 62, and the sliding part 63 can be clamped in the T-shaped limit slot 19 and slide along the T-shaped limit slot 19. When the laminectomy punch is disassembled, the front end of the slide bar 20 lifts up and the rear end thereof is limited by the tail limit block 60 so as to prevent the slide bar 20 from sliding out. In actual manufacturing, the tail limit block 60 can be composed of column structures, that is, the head 61 and the neck 62 are two cylinders of which the central axes are coincided, with the cross-section diameter of the head 61 being greater than the cross-section diameter of the neck 62, and the sliding part 63 features a having a central axis perpendicular to the central axis of the neck 62. This design can facilitate the installation or removal of the tail limit block 60, and is convenient to use.

As an improved embodiment, as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 9 and Fig. 13, an auxiliary boss 24 located at the front end of the limiting inner hole 23 can also be disposed at the rear end of the bottom of the slide bar 20, and an arc-shaped inclined surface 101 located at the front end of the T-shaped limit slot 19 can be correspondingly disposed at the rear end of the top of the main body 10, so that when the laminectomy punch is disassembled, the auxiliary boss 24 can slide along the arc-shaped inclined surface 101 while the front end of the slide bar 20 lifts up, so as to assist in positioning the lifting angle of the slide bar 20.

In an embodiment of the present invention, as shown in Fig. 1 to Fig. 5, a first T-shaped boss 25 which can move along the slide rail 11 is disposed at the bottom of the slide bar 20, and a T-shaped groove 26 is disposed at the front end of the bottom of the slide bar 20; and a second T-shaped boss 102 located behind the cutting edge 12 is disposed at the front end of the top of the main body 10, and the second T-shaped boss 102 matches with the T-shaped groove 26. This design can ensure that when the laminectomy punch is in the working state, the slide bar 20 is connected to the main body 10, and can move forwards and backwards along the slide rail 11 without the occurrence of deviation.

When the laminectomy punch in the embodiments of the present invention is actually used, once the movable handle 30 is pulled forwards and backwards (that is, a user simultaneously holds the main body 10 and the movable handle 30, and presses or loosens the movable handle 30) , the bulge 35 on the upper left side of the movable handle 30 shown in the figures is in contact with the end face of the slide bar groove 21, the movable handle 30 rotates counterclockwise around the arc-shaped trajectory slot 33 under the action of the limit pin 14, and at the same time, overcomes the pressure of the guide pressure spring 52 of the guide structure 50 and drives the slide bar 20 to move to the front end along the slide rail 11, in which case the laminectomy punches bones and soft tissues. When the laminectomy punch is required to be disassembled, the movable handle 30 is loosened, the button shell 41 of the locking structure 40 is pressed and the movable handle 30 is pulled down to separate from the slide bar groove 21, the slide bar 20 is out of limitation, and the guide pressure spring 52 of the guide structure 50 ejects the guide limit block 53 and drives the slide bar 20 to slide backwards. While the slide bar 20 slides backwards, the auxiliary boss 24 at the back end of the bottom of the slide bar 20 slightly lifts up by means of the arc-shaped inclined surface 101 at the back end of the top of the main body 10, the guide shaft 51 rotates counterclockwise around the first rotating pin 17, and an included angle is formed between the guide shaft 51 and the main body 10, and meanwhile, the guide limit block 53 rotates counterclockwise around the second rotating pin 18, so that an included angle is also formed between the slide bar 20 and the main body 10. The guide pressure spring 52 continues to eject, the slide bar 20 continues to move backwards, and the included angle is increased until the tail limit block 60 slides to the closed end of the T-shaped limit slot 19 at the rear end of the top of the main body 10 and then is limited, and a fixed angle is formed between the slide bar 20 and the main body 10. This is the final disassembled state of the laminectomy punch, and cleaning and disinfection can thus be realized.

For the laminectomy punch in the embodiments of the present invention, gaps between the main body 10 and the slide bar 20 can be thoroughly cleaned and disinfected, whereby the remaining of bone residues and soft tissues is avoided, the possibility of cross infection is reduced, and the problems that the cleaning of laminectomy punches is difficult and time-consuming, and components are easy to lose, and the like are solved. The laminectomy punch of the present invention has the advantages of simple disassembling and assembling operations and strong practicability.

Obviously, the foregoing embodiments of the present invention are merely examples for clearly explaining the present invention, and not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, other various forms of variations or modifications can also be made based on the description above. It is unnecessary and impossible to list all the embodiments here. Any modification, equivalent replacement, and improvement and the like made within the spirit and principle of the present invention shall fall within the protection scope of the claims of the present invention.

Claims

A laminectomy punch, comprising a main body provided with a slide rail, a slide bar connected to the main body and a movable handle, a cutting edge being disposed at the front end of the main body, and the movable handle abutting against the slide bar and being capable of pushing the slide bar to move along the slide rail, wherein the laminectomy punch also comprises a locking structure which is arranged on the main body and used to switch a working state or a disassembled state of the laminectomy punch;

the locking structure comprises a first state and a second state;

when the locking structure is in the first state, the movable handle keeps abutting against the slide bar under the limiting action of the locking structure, the slide bar can move normally along the slide rail, in which case the laminectomy punch is in the working state; and

when the locking structure is in the second state, the movable handle can move downwards, the front end of the slide bar lifts up and is separated from the movable handle, and then the slide bar is away from the slide rail, in which case the laminectomy punch is in the disassembled state.
The laminectomy punch according to claim 1, wherein the locking structure comprises a button shell, a button and a button securing pin, the button shell is axially provided with a button inner-hole for placing the button, the button shell is circumferentially provided with a securing pin hole, a first groove and a second groove, the securing pin hole is arranged independent of the first groove and the second groove, and the first groove and the second groove are adjacently arranged along the axial direction of the button shell; and the button securing pin is embedded in the main body and located in the securing pin hole;

the movable handle is provided with a special-shaped boss;

when the locking structure is in the first state, the button is in an uncompressed state, the special-shaped boss is movably located in the first groove, in which case the laminectomy punch is in the working state; and

when the locking structure is in the second state, the button is in a compressed state, the special-shaped boss is located in the second groove, and the movable handle can move downwards along the second groove, in which case the laminectomy punch is in the disassembled state.
The laminectomy punch according to claim 2, wherein the securing pin hole is an elongated through-hole, the length direction of the securing pin hole is parallel to the axial direction of the button shell, and the width of the securing pin hole just matches with the cross-section diameter of the button securing pin;

the size of the first groove matches with the size of the special-shaped boss;

the second groove is an elongated groove arranged along the circumferential direction of the button shell, the second groove is communicated with the first groove, and the length of the second groove is greater than that of the first groove; and

when the button is compressed, the special-shaped boss slides to the second groove from the first groove, and the special-shaped boss can move downwards along the second groove.
The laminectomy punch according to claim 3, wherein the main body is provided with a cheek screw; a strip-shaped hole is disposed at the end of the movable handle that is connected to the main body, and the movable handle is connected to the main body through cooperative crossing of the strip-shaped hole and the cheek screw; and

the length direction of the strip-shaped hole matches with the downward-moving direction along the second groove of the special-shaped boss.
The laminectomy punch according to claim 1, wherein a trajectory slot is disposed at the end of the movable handle that is connected to the main body, the trajectory slot is composed of an arc-shaped trajectory slot and a linear trajectory slot which are connected, and the linear trajectory slot is arranged above the arc-shaped trajectory slot; and the main body is provided with a limit pin, and the movable handle makes motion along the trajectory slot by means of the limit pin; and

when the laminectomy punch is in the working state, the limit pin is located in the arc-shaped trajectory slot, in which case the movable handle can push the slide bar to move along the slide rail; and when the laminectomy punch is in the disassembled state, the limit pin is located in the linear trajectory slot, in which case the movable handle can move downwards to separate from the slide bar.
The laminectomy punch according to claim 5, wherein a slide bar groove is disposed at the bottom of the slide bar, a bulge is disposed at the joint of the movable handle and the slide bar, the bulge is in contact with the end face of the slide bar groove, and the movable handle pushes the slide bar to move along the slide rail through the rotatable abutment of the bulge and the slide bar groove.
The laminectomy punch according to claim 1, wherein the laminectomy punch also comprises a guide structure, the guide structure comprises a guide shaft, a guide pressure spring and a guide limit block, the guide shaft is provided with a securing block at one end and has a free end at the other end, and the guide pressure spring and the guide limit block are sleeved on the guide shaft in sequence;

a placement slot located behind the slide rail is disposed at the top of the main body, a front-end locating hole is disposed at the front end of the placement slot, and the front-end locating hole is connected to the securing block by means of a first rotating pin;

a middle locating hole located above the placement slot is disposed at the bottom of the slide bar, and the middle locating hole is connected to the guide limit block by means of a second rotating pin; and

when the laminectomy punch is in the working state, the guide shaft is arranged in the placement slot, and the two ends of the guide pressure spring are in a compressed state under the action of the securing block and the guide limit block; and when the laminectomy punch is in the disassembled state, the guide pressure spring resets and pushes the guide limit block, the free end of the guide shaft is separated from the placement slot under the action of resetting of the guide pressure spring, and the front end of the slide bar lifts up.
The laminectomy punch according to claim 7, wherein the laminectomy punch also comprises a tail limit block, and the tail limit block comprises a head, a neck and a sliding part which are successively connected;

a limiting inner hole is disposed at the rear end of the bottom of the slide bar, and the head of the tail limit block is in interference fit with the limiting inner hole; and

a T-shaped limit slot having a closed end is disposed at the rear end of the top of the main body, the size of the neck of the tail limit block matches with the opening size of the T-shaped limit slot, and the sliding part can be clamped in the T-shaped limit slot and slide along the T-shaped limit slot.
The laminectomy punch according to claim 8, wherein an auxiliary boss located at the front end of the limiting inner hole is also disposed at the rear end of the bottom of the slide bar, an arc-shaped inclined surface located at the front end of the T-shaped limit slot is also disposed at the rear end of the top of the main body, and the auxiliary boss can slide along the arc-shaped inclined surface while the front end of the slide bar lifts up.
The laminectomy punch according to any one of claims 1-9, wherein a first T-shaped boss which can move along the slide rail is disposed at the bottom of the slide bar, and a T-shaped groove is disposed at the front end of the bottom of the slide bar; and a second T-shaped boss located behind the cutting edge is disposed at the front end of the top of the main body, and the second T-shaped boss matches with the T-shaped groove.