CN213217542U

CN213217542U - Needle clamping device and fixing device

Info

Publication number: CN213217542U
Application number: CN202021848369.5U
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 part and a locking sleeve; one end of the connecting rod is provided with a through hole along the radial direction; the inner shaft is provided with a first end and a second end, the first end penetrates through the through hole of the connecting rod, and the first end is provided with an axial limiting part; 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 through hole, is sleeved on the inner shaft and is positioned between the handle part and the connecting rod, can move relative to the inner shaft, and is provided with a channel at one end facing the handle part, and the channel has a preset distance with the center of the locking sleeve.

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.

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.

In a first aspect, a needle clamping device is provided for clamping an orthopedic needle, which comprises a connecting rod, an inner shaft, a handle part and a locking sleeve; one end of the connecting rod is provided with a through hole along the radial direction; the inner shaft is provided with a first end and a second end, the first end penetrates through the through hole of the connecting rod, and the first end is provided with an axial limiting part; 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 through hole, is sleeved on the inner shaft and is positioned between the handle part and the connecting rod, can move relative to the inner shaft, and is provided with a channel at one end facing the handle part, and the channel has a preset distance with the center of the locking sleeve.

In a first possible implementation, a washer is provided between the handle part and the locking sleeve.

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

In combination with the above possible implementation manner, in a second possible implementation manner, when the locking sleeve is connected with the inner shaft in a circumferential limiting 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 through hole of the locking sleeve is provided with a matching surface for matching with the planar area, and the matching surface is attached to the planar area to form the circumferential limiting.

In combination with the above possible implementation manners, in a second possible implementation manner, the circumferential limiting connection is that the square hole is matched with the square shaft, the middle part of the inner shaft is the square shaft, and at least part of the hole section of the through hole of the locking sleeve is the square hole.

In combination with the above possible implementation manners, in a second possible implementation manner, when the inner shaft is circumferentially limited and connected to the connecting rod, the first end of the inner shaft is fixedly connected to the connecting rod through a thread.

In a second possible implementation manner, in combination with the above possible implementation manner, the handle piece is a nut, and the nut is in threaded connection with the second end of the inner shaft.

In a second possible implementation manner, in combination with the above 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 a distance between a partial surface of the cam and the locking sleeve is reduced when the cam portion rotates.

With reference to the foregoing possible implementation manner, in a second possible implementation manner, the connecting rod includes a first clamping arm and a second clamping arm that are arranged side by side, a first end of the first clamping arm is connected to a first end of the second clamping arm, a predetermined distance is provided between a second end of the first clamping arm and a second end of the second clamping arm, an axial hole is further formed between the first clamping arm and the second clamping arm, and the through hole is disposed at a second end of the first clamping arm and a second end 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 embodiments of the present application or the technical solutions in the prior art, 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 application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

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 view of a mounting base and a connecting rod 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; 300-a clamping mechanism; 310. 310 b-inner shaft, 311-first end, 312 b-second end; 320-handle piece, 320 b-cam handle, 321-barrel, 322-screwed hole, 323-handle part; 330. 330 a-locking sleeve, 331-through hole, 332-channel; 340-axial stop, 350-washer; 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 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 comprises a column, a beam and two 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 first clamping means a clamps 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 foot and lower leg of the patient. 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 to lock the foot support; 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. Adopt first needle clamping device a and/or second needle clamping device b to fix the affected limb, the loaded down with trivial details degree of operation just can be reduced to this disclosed technical scheme.

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, wherein the needle clamping device a is rotated by 90 degrees in a counterclockwise direction relative to the position in fig. 1. Figure 3 is a cross-sectional view of the needle clamping device a of figure 2 with the cutting plane passing through the centre line of the inner shaft and perpendicular to the support arm 21.

The first needle clamping device a comprises a connecting rod 200, an inner shaft 310, a handle part 320, a locking sleeve 330, an axial limiting 340 and a gasket 350. One end of the link 200 is rotatably provided on the support arm 21. The supporting arm 21 includes a fixing section and a mounting base 100 fitted over the fixing section, and the mounting base 100 includes a sleeve portion 120 and a shaft portion 110. The link is specifically connected to the shaft portion 110 of the mounting base 100. 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 sleeved on the fixing portion, 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.

In this embodiment, the 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 hole 230 and cutting the gap 240 from a substantially rectangular parallelepiped blank, wherein the gap 240 is disposed on a solid structure around the axial hole 230, and the axial hole 230 communicates with the gap 240. 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 clamping arm 210 is a half structure of an open ring structure (left half of the dotted line m in fig. 3), including a half of the main ring body and an extension thereof (second end 212). The second clamping arm 220 is the other half of the split ring structure (the right half of the dashed line m in fig. 3), and includes the other half of the main ring body and its extension (the second end 222). Shaft hole 230 is an annular hole of a split ring structure. The split ring structure is an integral structure, and 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 ends 212 and 222 of the linkage rod 200. The first end 311 and the second end 312 of the inner shaft 310 are distributed on both sides of the linkage rod 200. The end of the first end 311 is provided with an axial limit 340, and the axial limit 340 is a check ring. More specifically: the inner shaft 310 is inserted into the second end 212 and the second end 222 of the link 200 through the through hole 213 and the through hole 223, the first end 311 protrudes from the second holding arm 220 side of the link 200, and the second end 312 protrudes from the first holding arm 210 side of the link 200. The outer circumferential surface of the second end 312 of the inner shaft 310 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 center of the locking sleeve 330 is provided with a through hole 331. One end face of the locking sleeve 330 is flat and the other end is spherical, and a groove 332 is formed in the flat end face. The channel 332 is perpendicular to the centerline of the locking sleeve 330 and does not intersect the through-hole 331. The channel 332 is used for accommodating the first threaded needle 1. The depth of the groove 332 is smaller than the diameter of the first needle 1, and the outer circumferential surface of the first needle 1 partially protrudes from the planar end surface when the first needle is located in the groove 332. The locking sleeve 330 is disposed at the middle portion of the inner shaft 310 between the handle member 320 and the connecting rod. The locking sleeve 330 is axially movable relative to the inner shaft 310.

A washer 350 is also provided between the handle member 320 and the locking sleeve 330. The washer 350 fits over the inner shaft 310 and has an outer diameter that corresponds to the outer diameter of the locking sleeve 330. The washer 350 is used to press the first thread needle 1 by the grip member. The handle member 320 and the locking sleeve 330 are located on one side of the first clamping arm 210 of the linkage rod 200. The handle 320 and the locking sleeve 330 can move along the axial direction of the inner shaft 310, when the handle 320 pushes the locking sleeve 330 to approach the connecting rod 200, the lower connecting rod 200 can be clamped by the locking sleeve 330 and the axial limit 340, and the two rotational degrees of freedom of the first needle clamping device a are eliminated.

Description of the procedure:

the first needle 1 is inserted into the channel 332 of the locking sleeve 330, the orientation of the first needle 1 is adjusted until the proper implantation path is reached, and a tool is used to drive the first needle 1 into the patient's bone. In this process, the first needle 1 can move along the length of the channel 332, the locking sleeve 330 and the first needle 1 can rotate around the inner shaft 310, and the locking sleeve 330, the inner shaft 310, the handle member and the connecting rod 200 can also rotate around the shaft 110.

The handle member 320 is rotated to be adjacent to the locking sleeve 330. In this process, the inner shaft 310 pushes the washer 350, the first needle 1 and the locking sleeve 330 toward the connection rod 200. While the washer 350 compresses the first thread pin 1, the locking sleeve 330 and the axial stopper 340 clamp the first and second holding

arms

210 and 220 of the connecting rod 200, so that the connecting rod 200 embraces the shaft portion 110. The present disclosure provides a needle clamping device capable of at least rapidly pressing the first thread needle 1 against the locking sleeve and simultaneously fixing the locking sleeve 330 to the connecting rod 200.

The channel 332 in the end face of the locking sleeve 330 also guides and supports the first needle 1 during driving of the first needle 1 into the bone of the patient.

In some alternative embodiments, the washer 350 may not be provided, and the barrel 321 of the handle member 320 has a larger diameter, and the end surface of the barrel 321 may press the first needle 1 in the groove 332.

In some alternative embodiments, the middle of the inner shaft 310 is provided with a section of a square shaft, and the outer periphery of the section is four orthogonal planes. And the through hole 331 of the locking sleeve 330 is provided with a section of square hole, the size of which matches with the square shaft and forms a circumferential limit fit with the square shaft section.

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.

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 view of a mounting base 100 and a link 200a in another embodiment. In this embodiment, the link 200a has a split structure. 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.

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 locking sleeve 330 and the cam handle 320b, and the cam handle 320b can be rotated to drive the sleeve 360 to press the washer 350 to compress the first threading needle 1. 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 camming handle 320b may act directly on the washer 350. In alternative embodiments, a cylindrical cam may be used in place of cam knob 320 b. The cylindrical cam is coaxially arranged with the inner shaft 310b and can rotate relatively, the cam surface of the cylindrical cam is positioned on the end surface of the cylinder, the assembly body faces the sleeve 360, a bulge facing the cam surface is arranged on the sleeve 360, and when the cylindrical cam is rotated, the cam surface and the sleeve 360 interact to generate axial displacement between the cam surface and the sleeve 360, so that the locking sleeve 330 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 provided with a first end and a second end, the first end penetrates through the through hole of the connecting rod, and the first end is provided with an axial limiting part;

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; and

the locking sleeve is provided with a through hole, is sleeved on the inner shaft and is positioned between the handle part and the connecting rod, can move relative to the inner shaft, and is provided with a channel at one end facing the handle part, and the channel has a preset distance with the center of the locking sleeve.

2. The needle clamping device of claim 1, wherein a washer is disposed between said handle member and said locking sleeve.

3. The needle clamping device of claim 1, wherein the locking sleeve is in circumferential limit connection with the inner shaft, or the inner shaft is in circumferential limit connection with the connecting rod.

4. The needle clamping device according to claim 3, wherein when the locking sleeve is connected with the inner shaft in a circumferential limiting manner, the outer peripheral surface of the inner shaft at least comprises a plane area parallel to the inner shaft, the inner peripheral surface of the through hole of the locking sleeve is provided with a matching surface for matching with the plane area, and the matching surface is attached to the plane area to form the circumferential limiting manner.

5. The needle clamping device according to claim 4, wherein the circumferential limit connection is a square hole matched with a square shaft, the middle part of the inner shaft is the square shaft, and at least part of the hole section of the through hole of the locking sleeve is the square hole.

6. The needle clamping device of claim 3, wherein the first end of the inner shaft is fixedly connected to the connecting rod by a screw thread when the inner shaft is in circumferential limit connection with the connecting rod.

7. 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.

8. 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.

9. The needle clamping device of claim 1, wherein the connecting rod comprises a first clamping arm and a second clamping arm which are arranged side by side, a first end of the first clamping arm is connected with a first end of the second clamping arm, a predetermined distance is reserved between a second end of the first clamping arm and a second end of the second clamping arm, a shaft hole is further formed between the first clamping arm and the second clamping arm, and the through hole is formed in the second ends of the first clamping arm and the second clamping arm.

10. 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; and

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 9, and the needle clamping device is connected to the supporting arms.