CN213217541U

CN213217541U - Needle clamping device and fixing device

Info

Publication number: CN213217541U
Application number: CN202021848323.3U
Authority: CN
Inventors: 李书纲
Original assignee: Beijing Hehua Ruibo Technology Co ltd; Beijing And Huaruibo Medical Technology Co ltd
Current assignee: Beijing And Huaruibo Medical Technology Co ltd; Beijing Horibo Technology Co ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-05-18
Anticipated expiration: 2030-08-28

Abstract

The present disclosure relates to a needle clamping device and a fixing device. The needle clamping device is used for clamping a needle for orthopedics department and comprises a connecting rod, an inner shaft, a handle piece and a locking sleeve, wherein one end of the connecting rod is provided with a through hole along the radial direction; the inner shaft is rotatably arranged in the through hole of the connecting rod, a first end and a second end of the inner shaft are distributed on two sides of the connecting rod, and a first limiting surface is arranged at the first end; the handle piece is movably arranged at the second end of the inner shaft, and at least part of structure can axially move in the inner shaft when the handle piece moves relative to the inner shaft; the locking sleeve is provided with a central hole and sleeved outside the first end of the inner shaft, the locking sleeve can move relative to the inner shaft, the locking sleeve is provided with a second limiting surface, and the second limiting surface and the first limiting surface of the inner shaft are arranged in a face-to-face or oblique-to-face mode; wherein, the connecting rod constitutes handle spare and locking sleeve and is spacing on the axial of inner shaft.

Description

Needle clamping device and fixing device

Technical Field

The disclosure relates to the technical field of affected limb fixing devices in an operation process, in particular to a needle clamping device and a fixing device.

Background

In the context of, for example, knee replacement surgery, it is often desirable to keep the patient's limb stationary to facilitate the surgical procedure. In knee replacement surgery, for example, it is necessary to at least immobilize the femur during the osteotomy procedure performed on the femur. The conventional knee joint replacement surgery relies on an assistant to hold the leg of the patient by hand to keep the leg fixed. The fixed mode of hand shank has increased assistant's intensity of labour to accuracy and normalization rely on operating personnel's physical power level, and stability is relatively poor.

In the prior art, the fixing device can effectively reduce the physical consumption of doctors and the instability of manual operation. The fixing device can be fixed by binding the affected limb on the support or by rigidly connecting the affected limb with the bone through a threaded needle or other instrument and fixing the threaded needle on the support. However, the use of the fixation device increases the number of operative steps during the operation, increases the length of the operation, and results in increased exposure time of the affected part. In particular, in the fixing method of the instrument using the threaded needle, the approach of the threaded needle needs to be adjusted in multiple directions before the threaded needle is implanted, and the threaded needle needs to be fixed on the fixing device after the threaded needle is implanted, and parts of the fixing device are locked. The above operation is not favorable for reducing the complexity of the operation.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a needle clamping device and a fixing device.

The needle clamping device comprises a connecting rod, an inner shaft, a handle part and a locking sleeve, wherein one end of the connecting rod is provided with a through hole along the radial direction; the inner shaft is rotatably arranged in the through hole of the connecting rod, a first end and a second end of the inner shaft are distributed on two sides of the connecting rod, and a first limiting surface is arranged at the first end; the handle piece is movably arranged at the second end of the inner shaft, and at least part of structure can axially move in the inner shaft when the handle piece moves relative to the inner shaft; the locking sleeve is provided with a central hole and sleeved outside the first end of the inner shaft, the locking sleeve can move relative to the inner shaft, the locking sleeve is provided with a second limiting surface, and the second limiting surface and the first limiting surface of the inner shaft are arranged in a face-to-face or oblique-to-face mode; wherein, the connecting rod constitutes handle spare and locking sleeve and is spacing on the axial of inner shaft.

In a first possible implementation manner, a first radial hole is formed in a first end of the inner shaft, and a hole wall part of an end face, which faces away from the first end, of the first radial hole is a first limiting surface; the locking sleeve is provided with a second radial hole, the wall part of the hole, which is consistent with the end surface of the first end of the inner shaft in the direction of the end surface, of the second radial hole is a second limiting surface, and the first limiting surface and the second limiting surface are arranged in a way of being obliquely opposite to each other; the inner shaft is rotationally connected with the connecting rod.

In combination with the above possible implementation manners, in a second possible implementation manner, the first radial hole and/or the second radial hole are circular holes.

In combination with the above possible implementation manners, in a third possible implementation manner, the locking sleeve and the inner shaft are in circumferential limit connection.

With reference to the foregoing possible implementation manner, in a fourth possible implementation manner, the outer peripheral surface of the inner shaft at least includes a planar area parallel to the inner shaft, the inner peripheral surface of the central hole of the locking sleeve is provided with a mating surface for mating with the planar area, and the mating surface and the planar area are fitted to form a circumferential limit.

With reference to the foregoing possible implementation manners, in a fifth possible implementation manner, an axial limiting structure is further disposed between the locking sleeve and the inner shaft, and the axial limiting structure is configured to limit the end portion of the inner shaft from protruding outward relative to the locking sleeve.

In a sixth possible implementation manner, in combination with the above possible implementation manners, the axial limiting structure is a limiting rod, and the limiting rod radially penetrates through the locking sleeve along the locking sleeve.

In a seventh possible implementation manner, in combination with the above possible implementation manners, an elastic member is further disposed between the inner shaft and the locking sleeve, and the elastic member acts on the inner shaft and makes the inner shaft have a tendency of protruding toward the outside of the locking sleeve.

With reference to the above possible implementation manners, in an eighth possible implementation manner, the handle member is a nut, the nut is in threaded connection with the second end of the inner shaft, and the nut moves along the inner shaft and approaches the locking sleeve, so that the first clamping arm and the second clamping arm can be driven to clamp the shaft portion of the mounting base.

In combination with the above possible implementation manner, in a ninth possible implementation manner, the handle member is a cam handle, the cam handle includes a handle portion and a cam portion, the cam portion is rotatably disposed on the inner shaft, and when the cam portion rotates, a distance between a partial surface of the cam and the locking sleeve is reduced, so that the first clamping arm and the second clamping arm can be driven to clamp the shaft portion of the mounting base.

With reference to the foregoing possible implementation manner, in a tenth possible implementation manner, the first end of the inner shaft protrudes out of the end portion of the locking sleeve, the first end has a flange protruding in the radial direction, one side surface of the flange facing the locking sleeve is a first limiting surface, and an end surface of the first end facing the flange is a second limiting surface.

In an eleventh possible implementation manner, in combination with the above possible implementation manners, in the connecting rod, the first end portion of the first clamping arm is fixedly connected or hinged with the first end portion of the second clamping arm.

In a second aspect, a fixation device is provided for supporting and fixing a diseased limb, comprising a base, a bracket, a first fastening mechanism and a second fastening mechanism; the base is provided with a connecting part; the bracket is arranged on the connecting part and is provided with two supporting arms, and a preset distance is reserved between the two supporting arms; the first fastening mechanism and the second fastening mechanism are respectively disposed on the two support arms, at least one of the first fastening mechanism and the second fastening mechanism is the needle clamping device described in any one of the first aspect, and the needle clamping device is connected to the support arms.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages: only need drive handle spare can be with the hand screw locking on locking sleeve to locking sleeve locks on the connecting rod simultaneously, the simple operation, labour saving and time saving.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a fastening device according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of the needle clamping device shown in FIG. 1;

FIG. 3 is a cross-sectional view of the needle clamping device of FIG. 2;

FIG. 4 is a schematic structural view of a needle clamping device in another embodiment;

fig. 5 is a schematic structural view of a needle clamping device in another embodiment.

Description of reference numerals:

1-a first threaded needle, 2-a second threaded needle; 10-base, 11-connecting part; 20-stand, 21-support arm, 22-support arm; 30-foot support; a-a first needle clamping device, b-a second needle clamping device; 100-mounting base, 110-shaft portion; 200. 200 a-link, 210 a-first gripper arm, 211 a-first end, 212 a-second end, 213-through hole; 220. 220 a-second holding arm, 221 a-first end, 222 a-second end, 223-through hole; 230. 230 a-shaft hole; 240. 240 a-gap; 310. 310a, 310 b-inner shaft, 311 a-first end, 312a, 312 b-second end, 313-first radial hole, 314 a-first limiting surface; 320-handle piece, 320 b-cam handle, 321-barrel, 322-screwed hole, 323-handle part; 330. 330 a-a locking sleeve, 331-a central hole, 332-a second radial hole, 333-a second limiting surface, 334 a-a second limiting surface; 340-limit pin, 350-spring; 360-sleeve.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a fixing device according to an embodiment of the present disclosure. The fixation device may be used in surgery to support and immobilize a diseased limb, such as a leg, such as a femur in a total knee arthroplasty.

The fixing device comprises a base 10, a bracket 20, a foot rest 30, a first fastening mechanism and a second fastening mechanism, wherein the first fastening mechanism is a first needle clamping device a, and the second fastening mechanism is a second needle clamping device b. The first needle clamping device a and the second needle clamping device b can rotate relative to the bracket 20. The upper surface of the base 10 is provided with a connecting portion 11 and a slide rail (not shown). The connecting portion 11 is a cylindrical body vertically provided on the base 10.

The support 20 includes a column, a beam, two support arms, and a mounting base 100 sleeved on the support arms. The cross beam and the upright column form a T-shaped frame, and two ends of the cross beam are respectively provided with a supporting arm 21 and a supporting arm 22. The first needle clamping device a and the second needle clamping device b are respectively arranged on the tops of the supporting

arms

21 and 22. The mounting base 100 includes a sleeve portion 120 and a shaft portion 110. The sleeve part 120 has a predetermined length, and the shaft part 110 is provided at one end of the sleeve part 120 with the length direction of both being the same. The sleeve portion 120 is disposed at the top end of the supporting arm 21, so that the shaft portion 110 extends at the free end of the supporting arm 21. The circumferential surface of the end of the shaft 110 is provided with a ring groove for mounting a snap ring for axial position limitation. The first clamping means a is capable of clamping the first threaded needle 1. Before clamping the first screw thread needle 1, the first needle clamping device a has two rotational degrees of freedom relative to the supporting arm 21, and an operator can flexibly adjust the direction of the first screw thread needle 1 according to needs. After the first threaded needle 1 is implanted into the affected limb, the first threaded needle 1 can be clamped and the first needle clamping device a and the supporting arm 21 can be locked only by screwing once, and the operation is simple and convenient. The second clamping pin device b also has the above-mentioned connection relationship with the second threading pin 2 and the support arm 22.

The foot rest 30 is used to support and secure the patient's foot. The foot support 30 is arranged on the slide rail through a slide block, the foot support 30 and the slide block are in ball hinge connection, and a locking structure is arranged between the foot support 30 and the slide block; a locking structure is also arranged between the sliding block and the sliding rail. After the angle between the lower leg and the thigh of the patient is adjusted, the sliding block can be locked on the sliding rail through the locking mechanism between the sliding block and the sliding rail, and the foot support 30 is locked through the locking structure between the foot support and the sliding block. In some alternative embodiments, the fixing device may not include the foot rest 30, and after the bracket 20, the first pin clamping device a and the second pin clamping device b perform stable fixing on the femur of the patient, the tibia/calf and the foot can be fixed manually or in other ways. As long as first needle clamping device a and/or second needle clamping device b are/is adopted to fix the affected limb, the technical scheme of the utility model can reduce the complexity of the operation.

The technical scheme of this disclosure can reduce the locking at least and loosen the in-process complex operation degree of screw needle. In some alternative embodiments, the second needle clamping device b can also be replaced by other needle clamping devices; in other alternative embodiments, the second needle clamping device b can be replaced by a fastening mechanism such as a binding band. As long as the first needle clamping device a is arranged, the complexity of the operation can be reduced to a certain degree.

The structure of the needle clamping device will be described in detail below with reference to fig. 2 and 3, taking the first needle clamping device a as an example. FIG. 2 is a schematic structural view of the needle clamping device a in FIG. 1; fig. 3 is a sectional view of the needle clamping device a in fig. 2, wherein the sectional plane passes through the center line of the first threaded needle 1 and is perpendicular to the support arm 21.

The first needle clamping device a includes a connecting rod 200, an inner shaft 310, a handle member 320, a locking sleeve 330, a stopper pin 340 and a spring 350.

The mounting base 100 is provided on the support arm 21. In the unlocked state, the link 200 can rotate relative to the mounting base 100.

Linkage 200 includes a first clamp arm 210 and a second clamp arm 220. The first end 211 of the first gripper arm 210 is connected to the first end 221 of the second gripper arm 220. The second end 212 of the first gripper arm 210 is spaced apart from the second end 222 of the second gripper arm 220 by a predetermined distance. A shaft hole 230 is further formed between the first and second chucking

arms

210 and 220.

In the illustrated embodiment, the connecting rod 200 is a split ring structure, and may be formed by milling the axial bore 230 and cutting the gap 240 from a generally rectangular parallelepiped blank, with the gap 240 being provided in a solid structure around the axial bore 230, with the axial bore 230 and the gap 240 communicating. The solid structure around the axial hole 230 is a main ring body, and the solid structures on both sides of the gap 240 can be regarded as extensions (the second end 212 and the second end 222) of the two ends of the main ring body respectively pointing to the outside of the ring body. The first holding arm 210 is a half structure of an open ring structure (left half of a dotted line m in the figure), and includes a half of the main ring body and an extension thereof; the second clamping arm 220 is the other half of the split ring structure (the right half of the dashed line m in the figure), and comprises the other half of the main ring body and an extension thereof. Shaft hole 230 is an annular hole of a split ring structure. The split ring structure is an integral structure, so the first end 211 of the first clamping arm 210 and the first end 221 of the second clamping arm 220 are fixedly connected.

The second end 212 of the first clamping arm 210 is provided with a through hole 213, and the through hole 213 is perpendicular to the shaft hole 230. The second end 222 of the second clamping arm 220 is provided with a through hole 223, the through hole 223 being coaxially aligned with the through hole 213.

The shaft hole 230 of the connecting rod 200 has the same diameter as the shaft 110 of the mounting base 100, and the two are rotatably connected through the shaft hole. When the second end 212 and the second end 222 are close to each other, the hole diameter of the shaft hole 230 tends to decrease, so that the first and second holding

arms

210 and 220 can clamp the shaft 110, thereby achieving the locking function.

The inner shaft 310 extends through the second end 112 and the second end 222 of the second member 200. The first end 311 and the second end 312 of the inner shaft 310 are distributed on two sides of the connecting rod 200, and the first end 311 is provided with a first limiting surface 314. Specifically, the method comprises the following steps: the inner shaft 310 is inserted into the second end 212 and the second end 222 of the linkage rod 200 through the through hole 213 and the through hole 223, the first end 311 protrudes from one side of the linkage rod 200, and the second end 312 protrudes from the other side of the linkage rod 200. The first end 311 is a square shaft, the outer circumference of the square shaft is four flat surfaces, and a transition step is arranged between the square shaft and the second end 312. The square shaft is also provided with a first radial hole 313. The first limiting surface 314 is a hole wall portion of an end surface of the first radial hole 313 facing away from the first end 311, i.e., a right half hole wall of the first radial hole 313 in the drawing. When the first needle 1 is locked, the hole wall of the part will contact and press the first needle 1, thus defining it as a first stop surface. Part of the wall surface of the circular hole is only one embodiment of the first limiting surface, and in some alternative embodiments, the first radial hole 313 may also be a radial recessed structure such as a kidney-shaped hole, a square hole or a groove, and the first limiting surface is a hole wall portion facing the connecting rod 200 in the above structure, and the hole wall portion may be a plane or a curved surface. The outer circumferential surface of the second end 312 is provided with threads.

The handle member 320 is movably disposed at the second end 312 of the inner shaft 310, and the handle member 320 is movable relative to the inner shaft 310 such that the handle member is axially movable with respect to the inner shaft 310. Specifically, the method comprises the following steps: the grip member 320 includes a barrel portion 321, a grip portion 323, and a threaded hole 322. The grip portion 323 protrudes in the radial direction of the cylindrical portion 321. The threaded hole 322 penetrates the cylindrical portion 321. Handle member 320 forms a nut and screw mechanism with second end 312 of inner shaft 310 via threaded bore 322, and handle member 320 is simultaneously axially movable within inner shaft 310 when rotated on inner shaft 310.

The locking sleeve 330 is centrally provided with a central bore 331, the central bore 331 being a stepped bore. The locking sleeve 330 is disposed outside the first end 311 of the inner shaft 310. The locking sleeve 330 is axially movable relative to the inner shaft 310. The locking sleeve 330 has a second limiting surface 333 and a second limiting surface 334, which are disposed diagonally opposite to the first limiting surface 314 of the inner shaft 310. Specifically, the method comprises the following steps: the maximum diameter of the central bore 331 (right half of fig. 3) is a square bore sized to mate with and form a circumferential limit fit with the square axis of the first end 311. The locking sleeve 330 is provided with a second radial hole 332 penetrating in the radial direction, the hole is divided into two sections by the central hole 331, and the second limiting surface 333 and the second limiting surface 334 are hole wall portions of the two sections which are consistent with the end surface of the first end 311 in the direction of the end surface. When the first needle 1 is locked, the hole wall will contact and press the first needle 1, thus defining it as a second stop surface. Part of the wall surface of the circular hole is only one embodiment of the second limiting surface, and in some alternative embodiments, the second radial hole 332 may also be a kidney-shaped hole, a square hole, or a groove, etc. which are radially disposed, and the second limiting surface is a hole wall portion (a hole wall portion facing away from the connecting rod 200) of the recess structure, which is aligned with the end surface of the first end 311, and the hole wall portion may be a plane or a curved surface.

The locking sleeve 330 is also provided with a radial hole for mounting a stopper pin, which is located outside the second radial hole 332 (to the right of the second radial hole 332 in fig. 3). The limit pin 340 is inserted into the radial hole of the locking sleeve 330 and located outside the end surface of the first end 311 to form an axial limit structure for the inner shaft 310.

The spring 350 is disposed over the inner shaft 310 and within the central bore 331 of the locking sleeve 330. One end of the spring 350 abuts against a step of the central bore 331 and the other end abuts against a shoulder of a transition step of the inner shaft 310. The spring 350 tends to project the first end 311 outward (to the right in fig. 3) from the central bore 331 (tending to move the locking sleeve 330 toward the second end 312 of the inner shaft 310).

The handle member 320 and the locking sleeve 330 are disposed at both sides of the connecting rod 200, and both the handle member 320 and the locking sleeve 330 can move along the axial direction of the inner shaft 310, so that when the handle member 320 and the locking sleeve 330 approach each other, the connecting rod 200 can tighten the shaft 110 while gripping them, eliminating two rotational degrees of freedom of the first needle clamping device a.

Description of the procedure:

the handle member 320 is rotated to become spaced farther from the locking sleeve 330. In the process, the first end 311 of the inner shaft 310 approaches the limit pin 340 under the action of the spring 350 and finally abuts against the limit pin 340, and the second radial hole 332 is aligned with the first radial hole 313 and inserted into the first thread needle 1.

The orientation of the first threaded needle 1 is adjusted until the proper implantation path is reached and a tool is used to drive the first threaded needle 1 into the patient's bone.

The handle member 320 is rotated to be adjacent to the locking sleeve 330. In this process, the inner shaft 310 pulls the first needle 1 and the locking sleeve 330 together toward the handle member 320. Locking sleeve 330 acts on second end 222 of linkage rod 200 and handle member 320 acts on second end 212 such that first and second clamp

arms

210 and 220 clamp shaft portion 110. In addition, the first limit surface 314 of the inner shaft 310 and the

second limit surface

334 and 333 of the locking sleeve 330 clamp the first thread pin 1 together, so that the first thread pin 1 cannot move or rotate.

In the above operation, the inner shaft 310 has two rotational degrees of freedom with respect to the mounting base 100, and thus the adjustment range is large. The first thread needle 1 can be clamped between the inner shaft 310 and the locking sleeve 330 only by rotating the handle piece 320, and the inner shaft 310 and the handle piece 320 are also locked with the connecting rod 200, so that the operation is convenient, and the time and the labor are saved. In addition, the first radial hole 313 and the second radial hole 332 can also guide and support the first screw-needle 1 during driving of the first screw-needle 1 into the patient's bone. The cooperation of the stopping pin 340 and the spring 350 also enables the second radial hole 332 to be automatically aligned with the first radial hole 313, thereby facilitating the rapid insertion of the first needle 1. The contact line of the first screw 1 and the first radial hole 313 is parallel to the contact line of the first screw 1 and the second radial hole 332, and the contact lines are long, so that the first screw 1 is stressed uniformly and locked firmly.

In some alternative embodiments, the spring 350 may not be provided. During operation, the locking sleeve 330 can be moved by an operator to make the limit pin 340 abut against the end face of the first end 311, and the alignment of the second radial hole 332 and the first radial hole 313 is manually realized.

In some alternative embodiments, the spacing pin 340 and the spring 350 may not be provided. The second radial holes 332 are manually aligned with the first radial holes 313 during operation.

In some alternative embodiments, no circumferential stop may be provided between the inner shaft 310 and the locking sleeve 330, and the second radial holes 332 and the first radial holes 313 may be manually rotationally aligned during operation.

In some alternative embodiments, the circumferential limit between the inner shaft 310 and the locking sleeve 330 may be the engagement of a guide groove in the axial direction of the inner shaft 310 with a key provided on the locking sleeve 330; alternatively, one or two flats may be provided on the circumference of the first end 311 and corresponding mating structures may be provided on the locking sleeve 330. The mating structure of the locking sleeve 330 may be machined or additional parts may be provided on the locking sleeve 330, with portions of the surface of the parts forming the mating structure (e.g., the end or outer circumference of the pin or nail, the flat surface of the key).

In some alternative embodiments, the linkage comprises a rod body and two holes at two ends of the rod body, one hole for connecting with the shaft portion 110 of the mounting base 100 and the other hole for connecting with the inner shaft 310. That is, the first clamp arm 210 and the second clamp arm 220 are integrally connected to each other without providing the gap 240 corresponding to the link 200 in fig. 3. The connecting rod 200 and the mounting base 100 can be locked by a set screw or other devices.

Referring to fig. 4, fig. 4 is a schematic structural view of a needle clamping device in another embodiment. The structure of the needle clamping device in the embodiment is basically the same as the structure and principle of the first needle clamping device a shown in fig. 3, and the differences include: the connecting rod 200a is a split structure, and the connecting rod 200 is an integral structure; the inner shaft 310a and the locking sleeve 330a are not provided with radial holes, but clamp the first needle thread 1 through a gap therebetween; and, there is no limit pin between the inner shaft 310a and the locking sleeve 330a for axial limit. The differences in the structure of the linkage rod 200a, the inner shaft 310a and the locking sleeve 330a will be described in detail below.

Link 200a is formed by the connection of two separate clamp arms, a first clamp arm 210a and a second clamp arm 220a in the figure. The first clamping arm 210a includes a middle half-ring body and a first end 211a and a second end 212a at both ends of the half-ring body, and the second end 212a is longer than the first end 211 a. The second retaining arm 220a includes a middle half-ring body and a first end 221a and a second end 222a at both ends of the half-ring body, and the second end 222a is longer than the first end 221 a. The first clamping arm 210a and the second clamping arm 220a are buckled together, and the two half-rings form an open ring body with a shaft hole 230a at the center. The first end portion 211a is fixedly connected to the first end portion 221a, and the second end portion 212a has a gap 240a with the second end portion 222 a. In some alternative embodiments, the first end 211a and the first end 221a may be hinged.

The inner shaft 310a differs from the inner shaft 310 in that a first radial hole 313 is not provided, but a flange 313a is formed at the tip of the first end 311 a. The side of the flange 313a facing the second end 312a is a first limiting surface 314 a. In the assembly, the flange 313a protrudes beyond the end surface of the locking sleeve 330a, and the first stopper surface 314a faces the second stopper surface 334a, forming an annular groove therebetween.

The locking sleeve 330a differs from the locking sleeve 330 in that the second radial hole 332 and the radial hole for mounting the stopper pin 340 are not provided. The end surface of the locking sleeve 330a not adjacent to the connecting rod 200a is a second limiting surface 334 a.

When the handle member 320 is rotated, the inner shaft 310a and the locking sleeve 330a are relatively displaced in the axial direction, so that the first needle 1 can be clamped or loosened. The side of the flange 313a may also be provided with a groove to prevent the first screw-needle 1 from being withdrawn in the radial direction.

In some alternative embodiments, the inner shaft 310a and the linkage rod 200a cannot rotate relative to each other. The position of the first needle thread 1 in the annular groove formed by the first and second limiting

surfaces

314a and 334a is adjustable, so that it is not necessary to have a rotational degree of freedom between the inner shaft 310a and the connecting rod 200 a.

In some alternative embodiments, the inner shaft 310a and the linkage rod 200a cannot rotate relative to each other, and the locking sleeve 330a and the inner shaft 310a have no circumferential limit and can rotate relative to each other. In other alternative embodiments, the inner shaft 310a and the connecting rod 200a cannot rotate relatively, the locking sleeve 330a and the inner shaft 310a have no circumferential limit therebetween and can rotate relatively, and the end surface of the locking sleeve 330a is provided with a groove. When the first needle 1 is located in the groove, the locking sleeve 330a can follow during the rotation of the first needle 1 around the inner shaft 310 a. This ensures that the first needle 1 can be adjusted in position and prevents the first needle 1 from coming out.

Referring to fig. 5, fig. 5 is a schematic structural view of a needle clamping device in another embodiment. Compared with the first needle clamping device a shown in fig. 3, the needle clamping device in the embodiment uses the cam handle 320b to replace the handle piece 320 to realize the locking function. Specifically, the second end 312b of the inner shaft 310b is provided with a cam handle 320b and a sleeve 360, the sleeve 360 is located between the connecting rod 200 and the cam handle 320b, and the sleeve 360 can be driven to press the connecting rod 200 to realize locking when the cam handle 320b rotates. The cam knob 320b includes a cam portion rotatably disposed on the second end 312b with a center line of rotation perpendicular to the inner shaft 310b and a knob portion. When the cam knob 320b is pulled, the contour surface of the cam portion rotates, and the rotation motion can be decomposed into the axial movement of the inner shaft 310b, the radial movement and the rotation along the inner shaft 310b, which is equivalent to the axial movement of the partial structure of the cam knob 320b in the inner shaft 310 b.

In alternative embodiments, the sleeve 360 may not be provided and the cam knob 320b may act directly on the linkage rod 200. In alternative embodiments, a cylindrical cam may be used in place of cam knob 320 b. The cylindrical cam is coaxially disposed with the inner shaft 310b and can rotate relatively, the cam surface of the cylindrical cam is located on the end surface of the cylinder, the fitting body faces the sleeve 360, a protrusion facing the cam surface is disposed on the sleeve 360, and when the cylindrical cam is rotated, the cam surface and the sleeve 360 interact with each other to generate axial displacement therebetween, so that the connecting rod 200 is pressed.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A needle clamping device for clamping orthopedic needles, comprising:

one end of the connecting rod is provided with a through hole along the radial direction;

the inner shaft is rotatably arranged in the through hole of the connecting rod, a first end and a second end of the inner shaft are distributed on two sides of the connecting rod, and a first limiting surface is arranged at the first end;

a handle member movably disposed at the second end of the inner shaft, at least a portion of the structure being axially movable within the inner shaft when the handle member is movable relative to the inner shaft;

the locking sleeve is provided with a central hole and sleeved outside the first end of the inner shaft, the locking sleeve can move relative to the inner shaft, the locking sleeve is provided with a second limiting surface, and the second limiting surface and the first limiting surface of the inner shaft are arranged in a face-to-face or oblique-to-face mode;

wherein the connecting rod constitutes an axial stop of the handle piece and the locking sleeve on the inner shaft.

2. The needle clamping device according to claim 1, wherein a first end of the inner shaft is provided with a first radial hole, and a hole wall part of an end face of the first radial hole, which faces away from the first end, is the first limiting surface; a second radial hole is formed in the locking sleeve, the hole wall part of the second radial hole, which is consistent with the end face of the first end of the inner shaft in orientation, is the second limiting surface, and the first limiting surface and the second limiting surface are arranged in an inclined opposite manner; the inner shaft is rotatably connected with the connecting rod.

3. The needle clamping device of claim 2, wherein the first radial hole and/or the second radial hole is a circular hole.

4. The needle clamping device of claim 2 or 3, wherein a circumferential limit connection is formed between the locking sleeve and the inner shaft.

5. The needle clamping device according to claim 4, wherein the outer peripheral surface of the inner shaft comprises at least one plane area parallel to the inner shaft, and the inner peripheral surface of the central hole of the locking sleeve is provided with a matching surface for matching with the plane area, and the matching surface is fit with the plane area to form the circumferential limit.

6. The needle clamping device of claim 2 or 3, wherein an axial limiting structure is further arranged between the locking sleeve and the inner shaft and used for limiting the end part of the inner shaft from protruding outwards relative to the locking sleeve.

7. The needle clamping device of claim 6, wherein the axial limiting structure is a limiting rod, and the limiting rod penetrates through the locking sleeve along the radial direction of the locking sleeve.

8. The needle clamping device of claim 6, wherein a resilient member is disposed between the inner shaft and the locking sleeve, the resilient member acting on the inner shaft and tending to cause the inner shaft to bulge outwardly of the locking sleeve.

9. A needle clamping device as claimed in any one of claims 1 to 3, wherein the handle member is a nut which is threadedly connected to the second end of the inner shaft.

10. The needle clamping device of any one of claims 1 to 3, wherein the handle member is a cam handle, the cam handle includes a handle portion and a cam portion, the cam portion is rotatably disposed on the inner shaft, and a distance between a part of a surface of the cam and the locking sleeve is reduced when the cam portion is rotated.

11. The needle clamping device of claim 1, wherein a first end of the inner shaft protrudes from an end of the locking sleeve, the first end has a radially protruding flange, a side of the flange facing the locking sleeve is the first limiting surface, and an end surface of the first end facing the flange is the second limiting surface.

12. A fixation device for supporting and immobilizing a diseased limb, comprising:

a base having a connection portion;

the bracket is arranged on the connecting part and provided with two supporting arms, and a preset distance is reserved between the two supporting arms;

a first fastening mechanism and a second fastening mechanism respectively disposed on the two supporting arms, wherein at least one of the first fastening mechanism and the second fastening mechanism is the needle clamping device of any one of claims 1 to 11, and the needle clamping device is connected to the supporting arms.