Patent Publication Number: US-2022218436-A1

Title: Needle clamping device and leg support device

Description:
CROSS-REFERENCE OF RELATED APPLICATIONS 
     The present application is a continuation of International Application No. PCT/CN2021/109000, filed on Jul. 28, 2021, which claims priority of the Chinese patent application 202010885394.9 filed on Aug. 28, 2020 and entitled “Needle Clamping Device and Fixing Device”, the Chinese patent application 202022330951.9 filed on Oct. 16, 2020 and entitled “Leg Support Device” and the Chinese patent application 202110120633.6 filed on Jan. 28, 2021 and entitled “Leg Support Device”, all of which are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present application relates to the technical field of medical devices, in particular to a needle clamping device and a leg support device. 
     BACKGROUND 
     In scenarios such as knee arthroplasty, it is often necessary to keep the patient&#39;s limb fixed to facilitate the surgical operation. Taking knee arthroplasty as an example, at least the femur needs to be kept immobilized during the osteotomy of the femur. Traditional knee arthroplasty relies on an assistant to hold the patient&#39;s leg by hand to keep the leg fixed. The fixed way of holding the leg by hand increases the labor intensity of the assistant, and the accuracy and standardization depend on the physical strength level of the operator, and the stability is poor. 
     The fixed device can effectively reduce the physical exertion of the doctor and reduce the instability of manual operation. The fixing method of the fixing device may be to bind the affected limb to the support, or to establish a rigid connection with the bone of the affected limb through instruments such as threaded needles, and to fix the threaded needle on the support. However, the use of fixing devices increases the operation steps involved in the surgery, increases the duration of the surgery, and results in increased exposure time of the affected area. Especially in the fixing method of instruments using threaded needles, it is necessary to adjust the access of the threaded needle in multiple directions before implanting the threaded needle. After implanting, it is necessary to fix the threaded needle on the fixing device and lock the parts of the fixing device itself. The above operations are not conducive to reducing the complicated degree of surgery. 
     SUMMARY 
     The present application provides a needle clamping device and a leg support device so as to at least partially solve the above technical problems. 
     In a first aspect, the present application provides a needle clamping device for clamping an orthopedic needle, the needle clamping device comprises: a first component having a shaft portion; a second component hinged with the shaft portion, the second component includes a first portion and a second portion whose relative position is variable, the first portion and the second portion are arranged to clamp the shaft portion when the relative position changes; a clamping mechanism for clamping the needle, the clamping mechanism is connected to the second component, the clamping mechanism is arranged so that at least part of the structure further clamps the first portion and the second portion and drives the first portion and the second portion to change the relative position so that the second component clamps the shaft portion in the process of clamping the orthopaedic needle. 
     In a first possible implementation manner, the first portion and the second portion of the second component are a first clamping arm and a second clamping arm arranged side by side, a first end portion of the first clamping arm is connected to a first end portion of the second clamping arm, a predetermined distance is formed between a second end portion of the first clamping arm and a second end portion of the second clamping arm, and a shaft hole is formed between the first clamping arm and the second clamping arm; the second component is rotatably connected with the shaft portion of the first component through the shaft hole. 
     In combination with the above possible implementation manners, in a second possible implementation, the clamping mechanism includes: an inner shaft that penetrates through the second end portion of the first clamping arm and the second end portion of the second clamping arm, a first end and a second end of the inner shaft are distributed on both sides of the second component, and the first end is provided with a first limiting surface; a handle member movably arranged on the second end of the inner shaft, when the handle member is movable relative to the inner shaft, at least part of the structure can move in an axial direction of the inner shaft; a locking sleeve having a through hole, the locking sleeve is sleeved on the outside of the first end of the inner shaft, the locking sleeve can move relative to the inner shaft, the locking sleeve has a second limiting surfaces, the second limiting surface and the first limiting surface of the inner shaft are arranged face to face or diagonally opposite to each other; wherein, the second component forms limit for the handle member and the locking sleeve in the axial direction of the inner shaft. 
     In combination with the above possible implementation manners, in a third possible implementation manner, a first radial hole is provided on the first end of the inner shaft along the radial direction, a hole wall portion of the first radial hole facing away from an end surface of the first end is the first limiting surface, the locking sleeve is provided with a second radial hole along the radial direction, and a hole wall portion of the second radial hole that has the same direction as the end surface of the first end of the inner shaft is the second limiting surface. The first limiting surface is arranged diagonally opposite to the second limiting surface. 
     In combination with the above possible implementation manners, in a fourth possible implementation manner, the first end of the inner shaft is located in the locking sleeve, and the locking sleeve is provided with a limiting rod. 
     In combination with the above possible implementation manners, in a fifth possible implementation manner, the first end of the inner shaft is provided with a flange protruding radially, the flange is located on a side portion of an end of the locking sleeve facing away from the second component, a gap is formed between the flange and the end of the locking sleeve facing away from the second component, a side surface 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. 
     In combination with the above possible implementations, in a sixth possible implementation, the handle member includes a cylinder portion and a handle portion, the cylinder portion is connected with the handle portion, the handle portion radially protrudes out of the cylinder portion, the cylinder portion and the handle portion are sleeved outside the second end of the inner shaft and are threadedly connected with the second end of the inner shaft, an end of the handle portion is in contact with the second end portion of the first clamping arm. When the handle portion is rotated, it can drive the inner shaft to move the axial direction and drive the locking sleeve to squeeze the second end portion of the second clamping arm. 
     In combination with the above possible implementations, in a seventh possible implementation, the handle member is a cam handle, the cam handle includes a cam portion and a handle portion, the cam portion is connected with the handle portion, the cam portion is rotatably connected with the second end of the inner shaft. When the handle portion rotates to drive the cam portion to rotate, it can drive the inner shaft to move in the axial direction and drive the locking sleeve to squeeze the second end portion of the second clamping arm. 
     In combination with the above possible implementation manners, in an eighth possible implementation manner, the inner shaft is connected with the locking sleeve in ma manner of circumferential limit. 
     In combination with the above possible implementation manners, in a ninth possible implementation manner, an outer peripheral surface of the inner shaft at least includes a plane area parallel to the inner shaft, an inner peripheral surface of the through hole of the locking sleeve is provided with a matching surface matched with the plane area. The matching surface is fitted with the plane area to form the circumferential limit. 
     In combination with the above possible implementation manners, in a tenth possible implementation manner, an elastic member is further provided between the first end of the inner shaft and the locking sleeve, and the elastic member acts on the inner shaft and enables that the inner shaft have a tendency of protruding toward the outside of the sleeve. 
     In a second aspect, the present application provides a leg support device having the needle clamping device provided by any of the implementations of the first aspect. The leg support device includes: a base; a support rod assembly connected to the base; the needle clamping device is provided on the upper portion of the support rod assembly. 
     In a first possible implementation manner, the support rod includes a first support rod assembly and a second support rod assembly respectively disposed on two sides of the base, and at least one of the first support rod assembly and the second support rod assembly can be detachably connected to the base. 
     In combination with the above possible implementation manners, in a second possible implementation manner, the position of the support rod and the base relative to each other along a length direction of the side of the base is adjustable. 
     Compared with the prior art, embodiments of the present application have at least the following advantages: 
     In the needle clamping device provided in embodiments of the present application, the clamping structure in the needle clamping device can make the second component clamp the shaft portion of the first component while clamping the orthopaedic needle, or make the second component release the shaft portion of the first component while releasing the orthopaedic needle. The complicated degree of the operation in the process of locking and releasing orthopedic needles (such as threaded needles) is reduced, the operation is convenient, and time and effort are saved. 
     In addition, in the leg support device provided by the embodiment of the present application, at least one of the first support rod assembly and the second support rod assembly is detachably connected to the base respectively, and the needle clamping device mounted on the left or right can be selected according to the leg under surgery, which reduces the occupation of the surgery space and facilitates the operation around the knee joint of the human body. What more, the need for sterilization of instruments prior to surgery is reduced because only the support rod assembly that needs to be mounted on the base needs to be sterilized. In addition, the first support rod assembly and the second support rod assembly are located on both sides of the base, and the space between the two and the upper surface of the base can be used to lay the affected limb straight and flat to check the tension of the joint ligament during the surgery or after the surgery is completed, it is not necessary to remove the leg support device from the surgery table to make room for the affected limb to lay flat. Moreover, the leg is positioned by the first support rod assembly, which avoids the problems of poor stability and poor accuracy of the hand-holding fixation. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. 
         FIG. 1  is a structural schematic diagram of a leg support device according to an embodiment of the present application; 
         FIG. 2  is a structural schematic diagram of the base in  FIG. 1 ; 
         FIG. 3  is a schematic diagram of the structure of the vertical cylinder in  FIG. 1  connecting with the base; 
         FIG. 4  is a structural schematic diagram between the vertical cylinder and the upright column in  FIG. 1 ; 
         FIG. 5  is a structural schematic diagram of the needle clamping device in  FIG. 1 ; 
         FIG. 6  is a cross-sectional view schematically showing the structure of the needle clamping device of  FIG. 5 ; 
         FIG. 7  is a cross-sectional view schematically showing the structure of the needle clamping device in another embodiment; 
         FIG. 8  is a cross-sectional view schematically showing the structure of the needle clamping device in another embodiment; 
         FIG. 9  shows a structural schematic diagram of the foot support positioning device in  FIG. 1  and the cross-sectional view of the foot support; 
         FIG. 10  is an enlarged view of the foot support positioning device in  FIG. 9 ; 
         FIG. 11  is a perspective view of the foot support positioning device in  FIG. 1 ; 
         FIG. 12  is a structural schematic diagram of the locking block in  FIG. 1 ; 
         FIG. 13  is a structural schematic diagram of the locking block driver in  FIG. 1 ; 
         FIG. 14  is a structural schematic diagram of a locking block and a locking block driver in another embodiment; 
     
    
    
     In the drawings, the drawings are not necessarily drawn according to actual scale. 
     DETAILED DESCRIPTION 
     Embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application by way of example, but should not be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. 
     In the description of this application, it should be noted that, unless otherwise specified, the meaning of “plurality” is two or more; The orientation or positional relationship indicated by the terms “upper”, “lower”, “left”, “right”, “inner”, “outside” etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as restrictions to the present application. Furthermore, the terms “first”, “second” etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance. “Vertical” is not strictly vertical, but within the allowable range of errors. “Parallel” is not strictly parallel, but within the allowable range of errors. 
     In the description of the present application, it should also be noted that, unless otherwise expressly specified and limited, the terms “install”, “connect” and “connect” should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it can be direct connection or indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. 
     For a better understanding of the present application, embodiments of the present application are described below with reference to  FIGS. 1 to 14 . 
     Referring to  FIG. 1 ,  FIG. 1  is a structural schematic diagram of a leg support device in an embodiment disclosed in the present application. The leg brace device can be used in surgical operations to support and fix an affected limb such as a leg, for example, to fix the femur in total knee arthroplasty. 
     In the first aspect, embodiments of the present application provide a leg support device, which includes: a base  90   d , a first support rod assembly  10   d , a second support rod assembly  20   d , a first needle clamping device and a second needle clamping device. The structure of the first needle clamping device and the structure of the second needle clamping device can be the same. 
     The base  90   d  is used as the installation and support base of the device, and the first support rod assembly  10   d  and the second support rod assembly  20   d  are mounted on the base  90   d.    
     Referring to  FIG. 1 , in some optional embodiments, the support bases of the two needle clamping devices are two independent support rod structures, namely a first support rod assembly  10   d  and a second support rod assembly  20   d . The first support rod assembly  10   d  and the second support rod assembly  20   d  are detachably connected to the base  90   d  respectively, so that needle clamping device mounted on the left or right side can be selected according to the leg under operation. This can reduce the occupation of the surgical space and facilitate the operation around the knee joint of the human body. Also, the need for sterilization of instruments prior to surgery can be reduced, as only the support rod assembly that needs to be mounted on the base  90   d  needs to be sterilized. 
     There is no beam between the first support rod assembly  10   d  and the second support rod assembly  20   d , so during or after the surgery, the doctor can directly lay the patient&#39;s leg flat for joint flexion and extension observation without removing the leg support device. In addition, the doctor can choose to install only the first support rod assembly  10   d  or the second support rod assembly  20   d  according to the convenience of operation, without having to install both, reducing operation steps and occupied operation space near the knee joint. The position of the support rod assembly on the slide rail can also be adjusted through the slider at the bottom, which can adapt to more clinical conditions. 
     The first support rod assembly  10   d  and the second support rod assembly  20   d  can be slidably connected with the base  90   d , the first support rod assembly  10   d  and the second support rod assembly  20   d  can slide relative to the base  90   d , and the position of the legs can be fine-tuned; A locking mechanism may also be provided between the first support rod assembly  10   d , the second support rod assembly  20   d  and the base  90   d  for locking the relative positions of the first support rod assembly  10   d , the second support rod assembly  20   d  and the base  90   d.    
     Referring to  FIG. 2 , specifically, the base  90   d  is an I-shaped bottom plate with a first slide rail  91   d  in the middle, and a second slide rail  92   d  and a third slide rail  93   d  are respectively provided on both sides of one end of the first slide rail  91   d.    
     The first support rod assembly  10   d  and the second support rod assembly  20   d  are symmetrically arranged on both sides of the first sliding rail  91   d , and the two needle clamping devices are also symmetrically arranged. 
     Referring to  FIG. 1 ,  FIG. 3  and  FIG. 4 , the structural composition of the first support rod assembly  10   d  are taken as an example to describe below. 
     The lower end of the vertical cylinder  11   d  is connected to the second sliding rail  92   d  of the base  90   d  through the second sliding block  100   e , and is controlled by the locking block  300   e , the locking block driver  400   e  and the pin  500   e  to be locked with the second sliding rail  92   d . The structures and their connection relationships of the second sliding block  100   e , the locking block  300   e , the locking block driving member  400   e  and the pin  500   e  are the same as the structure and its deformation of the sliding block  100   m , the locking block  300   m , the locking block driving member  400   m  and the pin  500   m.    
     The upper end of the vertical cylinder  11   d  is provided with a clamping device, and the clamping device can lock the upright column  12   d  inserted into the vertical cylinder  11   d . The clamping device includes a cam handle  13   d , a first clamping arm  14   d , a second clamping arm  15   d  and a locking screw  16   d . One end of the first clamping arm  14   d  is hingedly connected with one end of the second clamping arm  15   d , an arc-shaped clamping portion is provided in the middle of the two, and a gap is formed between the other ends. The cam handle  13   d  is provided at the position where the two clamping arms are provided with a gap, and the distance between the clamping arms is changed by the cam portion to realize the clamping effect. The cam handle  13   d , the nut, the rotating shaft and the like constitute a cam handle assembly for realizing the clamping of the clamping arm. The locking screw  16   d  can also lock the vertical column  12   d  in the vertical cylinder  11   d  from the radial direction. Of course, the above locking mechanism is not unique, for example, the locking screw  16   d  may not be provided, or only the locking screw  16   d  may be provided, or the clamping structure in the needle clamping device may be used. 
     The upright column  12   d  is inserted into the upright cylinder  11   d , and the cam handle  13   d  can be released when needed to adjust the insertion depth, thereby changing the height of the needle clamping device at the top of the upright post  12   d  relative to the base  90   d.    
     In some optional embodiments, the first support rod assembly  10   d  can also be replaced with a support rod/arm with a fixed length, that is, the vertical cylinder  11   d  is fixedly connected with the vertical column  12   d , and the lengths of the vertical cylinder  11   d  and the vertical column  12   d  are not adjustable in the axial direction. 
     In some optional embodiments, the first support rod assembly  10   d  and the second support rod assembly  20   d  may also be connected to the base  90   d  in other ways. For example, it is directly fixed on the base  90   d  with screws, bolts or other fastening structures. 
     In some optional embodiments, only the first support rod assembly  10   d  or the second support rod assembly  20   d  may also be provided. In use, the first support rod assembly  10   d  can be installed on the first slide rail  91   d  or the second slide rail  92   d  on the base  90   d  according to actual needs. Specifically, the first support rod assembly  10   d  can be installed on the third slide rail  93   d  in the attitude shown in  FIG. 1 ; or the first support rod assembly  10   d  can be rotated 180 degrees around its long axis relative to the attitude shown in  FIG. 1 , and then installed on the third sliding rail  93   d , so that the needle clamping device is still located outside, which is convenient for operation. 
     The first needle clamping device and the second needle clamping device are disposed on the top of the first support rod assembly  10   d  and the second support rod assembly  20  respectively. The first needle clamping device is capable of clamping the first threaded needle  1 . Before clamping the first threaded needle  1 , the first needle clamping device has two rotational degrees of freedom relative to the first support rod assembly  10   d , and the operator can flexibly adjust the direction of the first threaded needle  1  as required. After the first threaded needle  1  is implanted in the affected limb, the first threaded needle  1  can be clamped and locked between the first needle clamping device and the first support rod assembly  10   d  by only one tightening, which is easy and convenient to operate. The second needle clamping device also has the above-mentioned connection relationship with the second threaded needle. 
     In some optional embodiments, the second needle clamping device can also be replaced with other form of needle clamping devices; in some other optional embodiments, the second needle clamping device can also be replaced with a fastening mechanism such as a bandage. As long as the first needle clamping device is provided, the complicated degree of the operation in the process of locking and releasing the threaded needle can be reduced to a certain extent. 
     The inventors of the present application have found that the fixing manner of the threaded needle used in the related art requires that the access of the threaded needle needs to be adjusted in multiple directions before implanting the threaded needle, and after implanting the threaded needle needs to be fixed on the fixing device and the parts of the fixing device itself needs to be locked. The above operations are not conducive to reducing the complicated degree of the surgery. 
     In view of the above findings, embodiments of the present application also provide a needle clamping device for clamping an orthopedic needle, which can at least reduce the complicated degree of operations in the process of locking and releasing the threaded needle. In order to facilitate the understanding of the needle clamping device of embodiments of the present application, the needle clamping device, the first needle-clamping device, and the second needle-clamping device of embodiments of the present application are described further in combination with  FIG. 5  and  FIG. 6 , taking the first needle-clamping device as an example.  FIG. 5  is a structural schematic diagram of the first needle clamping device in  FIG. 1 ;  FIG. 6  is a cross-sectional view of the first needle clamping device, wherein the cutting plane passes through the centerline of the first threaded needle  1  and is perpendicular to the first support rod assembly. 
     The first needle clamping device includes a first component  100 , a second component  200  and a clamping mechanism  300 . The first component  100  is provided on the first support rod assembly  10   d . In the unlocked state, the second component  200  can be rotated relative to the first component  100 , the clamping mechanism  300  as a whole can be rotated relative to the second component  200 , and the axes of the two rotational movements are in a spatially vertical relationship. The above connection relationship is convenient for adjusting the implanted device to a proper implantation orientation before the implantation operation. 
     The first component  100  includes a shaft portion  110 . The shaft portion  110  is disposed at the top end of the first support rod assembly  10   d . The peripheral surface of the tail end of the shaft portion  110  is provided with a ring groove for installing a snap ring to limit axially. 
     The second component  200  is hinged with the shaft portion  110 , the second component  200  includes a first portion and a second portion whose relative positions are variable, and the first portion and the second portion are arranged to clamp the shaft portion  110  when the relative position changes. In some embodiments, the first and second portions of the second component are first and second clamping arms  210  and  220  disposed side by side. The first end portion  211  of the first clamping arm  210  is connected to the first end portion  221  of the second clamping arm  220 . There is a predetermined distance, that is, a gap  240 , between the second end portion  212  of the first clamping arm  210  and the second end portion  222  of the second clamping arm  220 . A shaft hole  230  is further provided between the first clamping arm  210  and the second clamping arm  220 . 
     In the illustrated embodiments, the second component  200  is an open ring structure, which can be made by milling holes and slitting on a roughly cuboid blank, and the slit is arranged on the solid structure around the hole along the radial direction of the hole and is in communication with the hole. The solid structure around the hole is the main ring body, and the solid structures on both sides of the slit can be regarded as extension portions of the two tail ends of the main ring body respectively pointing to the outside of the ring body (the second end portion  212  and the second end portion  222 ). The first clamping arm  210  is a half structure of the open ring structure (the left half portion of the dotted line m in  FIG. 6 ), including half of the main ring body and its extension portion (the second end portion  212 ). The second clamping arm  220  is the other half structure of the open ring structure (the right half portion of the dotted line m in  FIG. 6 ), including the other half of the main ring body and its extension portion (the second end portion  222 ). The shaft hole  230  is a ring hole of the open ring structure. The open ring structure is an integral structure, and the first end portion  211  of the first clamping arm  210  is fixedly connected with the first end portion  221  of the second clamping arm  220 . 
     The second end portion  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 portion  222  of the second clamping arm  220  is provided with a through hole  223 , and the through hole  223  is coaxially aligned with the through hole  213 . 
     The shaft hole  230  of the second component  200  has the same diameter as the shaft portion  110  of the first component  100 , and the two form a rotational connection through the shaft hole engagement. When the second end portion  212  and the second end portion  222  are brought close to each other, the diameter of the shaft hole  230  tends to decrease, so the first clamping arm  210  and the second clamping arm  220  can clamp the shaft portion  110  to achieve locking function. 
     The clamping mechanism  300  is used for clamping the needle, the clamping mechanism  300  is connected to the second component  200 , the clamping mechanism  300  is configured that at least part of the structure clamps the first portion and the second portion, and in the process of clamping the orthopaedic needle the first portion and the second portion are driven to change the relative position so that the second component  200  clamps the shaft portion  110 . In some embodiments, the clamping mechanism  300  may include an inner shaft  310 , a handle member  320 , a locking sleeve  330 , a limit pin  340  and a spring  350 . 
     The inner shaft  310  penetrates through the second end portion  212  and the second end portion  222  of the second component. The first end  311  and the second end  312  of the inner shaft  310  are distributed on both sides of the second component  200 , and the first end  311  is provided with a first limiting surface  314 . The outer circumferential surface of the second end  312  is provided with threads. 
     Specifically, the inner shaft  310  is inserted into the second end portion  212  and the second end portion  222  through the through hole  213  and the through hole  223 , the first end  311  protrudes from one side of the second end portion  222 , and the second end  312  protrudes from one side of the second end portion  212 . The tail end section of the first end  311  is a square shaft, the outer peripheral surface of this section is four planes, and a transition step is further provided between this section and the second end  312 . The square shaft is further provided with a first radial hole  313 . The first limiting surface  314  is the hole wall portion of the first radial hole  313  facing the second end  312 , that is, the right half portion of the hole wall of the first radial hole  313  in the figure. When the first threaded needle  1  is locked, the hole wall portion contacts and presses the first threaded needle  1 , so it is defined as the first limiting surface. Part of the wall surface of the round hole is an implementation manner of the first limiting surface, and in some optional embodiments, the first radial hole  313  may also be a recessed structure arranged radially such as a waist-shaped hole, a square hole, or a groove. T the first limiting surface is the hole wall portion facing the second end  312  in the above structure, and the hole wall portion may be a plane or a curved surface. 
     The handle member  320  is movably disposed on the second end  312  of the inner shaft  310 , and the handle member  320  can move axially on the inner shaft  310  as a whole when the handle member  320  moves relative to the inner shaft  310 . Specifically, the handle member  320  includes a cylinder portion  321 , a handle portion  323  and a threaded hole  322 . The handle portion  323  protrudes from the outer surface of the cylinder portion  321  in the radial direction. The threaded hole  322  penetrates the cylinder portion  321 . The handle member  320  forms a nut-screw mechanism through the threaded hole  322  and the external thread of the inner shaft  310 . When the handle member  320  rotates on the inner shaft  310 , the handle member  320  can move axially on the inner shaft  310  at the same time. 
     The center of the locking sleeve  330  is provided with a through hole  331 , and the through hole  331  is a stepped hole. The locking sleeve  330  has a second limiting surface  333  and a second limiting surface  334 , which are arranged diagonally opposite to the first limiting surface  314  of the inner shaft  310 . Specifically, the through hole  331  is a square hole at the maximum diameter thereof (the right half portion of  FIG. 6 ), whose size matches the square shaft of the first end  311  of the inner shaft  310  and forms a circumferential limiting engagement with the square shaft. 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 through hole  331 . The second limiting surface  333  and the second limiting surface  334  are the hole wall portions of the two sections having the same direction as the end surface of the first end  311 . When the first threaded needle  1  is locked, the hole wall portions will contact and press against the first threaded needle  1 , so it is defined as the second limiting surface. Part of the wall surface of the round hole is only an implementation manner of the second limiting surface, and in some optional embodiments, the second radial hole  332  may also be a recessed structure arranged radially such as a waist-shaped hole, a square hole, or a groove, etc. The second limiting surface is the hole wall portion of the recessed structure that has the same direction as the end surface of the first end  311  (the hole wall portion facing away from the second component  200 ), and the hole wall portion may be a plane or a curved surface. The locking sleeve  330  is sleeved 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  is also provided with a radial hole for installing a limiting pin  340 , and the radial hole is located outside the second radial hole  332  (the right side of the second radial hole  332  in  FIG. 6 ). The limiting pin  340  is inserted into the radial hole of the locking sleeve  330  and is located outside the end surface of the first end  311  to form a structure of limiting the axial direction of the inner shaft  310 . 
     The spring  350  is sleeved on the inner shaft  310  and is located in the through hole  331  of the locking sleeve  330 . One end of the spring  350  abuts against a step of the through hole  331 , and the other end abuts against the shoulder of the transition step of the inner shaft  310 . The spring  350  causes the first end  311  has tendency to protrude outward (rightward in  FIG. 6 ) from the through hole  331  (the tendency to move the locking sleeve  330  toward the side of the second end  312  of the inner shaft  310 ). 
     The handle member  320  and the locking sleeve  330  are located on two sides of the second component  200  respectively. Both the handle member  320  and the locking sleeve  330  can move along the axial direction of the inner shaft  310 . When the handle member  320  and the locking sleeve  330  are close to each other, the second component  200  can clamp the shaft portion  110  under the clamping of the handle member  320  and the locking sleeve  330 , eliminating the two rotational degrees of freedom of the first needle clamping device. 
     Embodiments of the present application only need to drive the handle to realize the locking of the threaded needle and the locking of the two rotational degrees of freedom of the needle clamping device, which is convenient to operate and saves time and effort. 
     Instructions for use: 
     The handle member  320  is rotated so that the distance from the locking sleeve  330  becomes larger. In this process, under the action of the spring  350 , the first end  311  of the inner shaft  310  approaches the limit pin  340  and finally abuts against the limit pin  340 . At this time, the second radial hole  332  is aligned with the first radial hole  313  and the first threaded needle  1  is inserted. 
     The orientation of the first threaded needle  1  is adjusted until an appropriate implantation path is reached, and a tool is used to drive the first threaded needle  1  into the patient&#39;s bone. 
     The handle member  320  is rotated so that it is close to the locking sleeve  330 . In this process, the inner shaft  310  will pull the first threaded needle  1  and the locking sleeve  330  to approach the handle member  320  together. The locking sleeve  330  acts on the second end portion  222  of the second component  200 , and the handle member  320  acts on the second end portion  212 , so that the first clamping arm  210  and the second clamping arm  220  clamp the shaft portion  110 . In addition, the first limiting surface  314  of the inner shaft  310  and the second limiting surface  334  and the second limiting surface  333  of the locking sleeve  330  jointly clamp the first threaded needle  1 , so that the first threaded needle  1  cannot move or turn. In some other embodiments, the handle member  302  can also be a nut, the nut is connected with the second end  312  of the inner shaft  310  by a thread, and the nut can drive the first clamping arm  210  and the second clamping arm  220  to clamp the shaft portion  110  of the first component when the nut moves along the inner shaft  310  and approaches the locking sleeve  330 . 
     In the above operation process, the clamping mechanism  300  has two rotational degrees of freedom relative to the first component  100 , so the adjustment range of the threaded needle is relatively large. The first threaded needle  1  can be clamped between the inner shaft  310  and the locking sleeve  330  only by turning the handle member  320 , so that the inner shaft  310  and the handle member  320  are also locked with the second component  200  and the second component  200  is locked with the first component  100 , which is convenient to operate and saves time and effort. In addition, in the process of driving the first threaded needle  1  into the patient&#39;s bone, the first radial hole  313  and the second radial hole  332  in the clamping mechanism  300  can further guide and support the first threaded needle  1 , and the operator can grip the clamping mechanism  300  to prevent the first threaded needle  1  from being offset. The cooperation of the limiting pin  340  and the spring  350  can further automatically align the second radial hole  332  with the first radial hole  313 , so as to facilitate the rapid insertion of the first threaded needle  1 . The contact line between the first threaded needle  1  and the first radial hole  313  is parallel to the contact line between the first threaded needle  1  and the second radial hole  332  and the contact line is long, so that the first threaded needle  1  is evenly stressed and locked reliable. In some optional embodiments, the spring  350  may not be provided. During the operation, the operator can move the locking sleeve  330  to make the limiting pin  340  abut against the end surface of the first end  311 , and manually align the second radial hole  332  with the first radial hole  313 . 
     In some optional embodiments, the limiting pin  340  and the spring  350  may not be provided. The second radial hole  332  is manually aligned with the first radial hole  313  during operation. 
     In some optional embodiments, no circumferential limit may be provided between the inner shaft  310  and the locking sleeve  330 , and the second radial hole  332  and the first radial hole  313  may be manually rotated and aligned during operation. 
     In some optional embodiments, the circumferential limit between the inner shaft  310  and the locking sleeve  330  may be the cooperation of a guide groove along the axial direction of the inner shaft  310  and a key provided on the locking sleeve  330 ; or, one or two flat surfaces are provided on the peripheral surface of the first end  311 , and corresponding matching structures are provided on the locking sleeve  330 . The matching structure of the locking sleeve  330  may be formed by machining, or additional parts may be provided on the locking sleeve  330 , and part of the surface of the part forms a matching structure (such as the end surface or the outer peripheral surface of a pin or a nail, the flat surface of a key). 
     Referring to  FIG. 7 ,  FIG. 7  is a schematic structural diagram of a needle clamping device in another embodiment. The structure of the needle clamping device in the present embodiment is basically the same as the structure and principle of the first needle clamping device shown in  FIG. 6 , the difference include the second component  200   a  is a split structure, and the second component  200  is an integral structure; the inner shaft  310   a  and the locking sleeve  330   a  are not provided with radial holes, but the first threaded needle  1  is clamped by the gap between them; and there is no limit pin between the inner shaft  310   a  and the locking sleeve  330   a  to perform axial limit. The structural differences of the second component  200   a , the inner shaft  310   a  and the locking sleeve  330   a  will be specifically described below. 
     The second component  200   a  is formed by connecting two separate clamping arms, and the two clamping arms are the first clamping arm  210   a  and the second clamping arm  220   a  in the figure. The first clamping arm  210   a  includes a half ring body in the middle and a first end portion  211   a  and a second end portion  212   a  at both ends of the half ring body, and the second end portion  212   a  is longer than the first end portion  211   a . The second clamping arm  220   a  includes a half ring body in the middle and a first end portion  221   a  and a second end portion  222   a  at both ends of the half ring body, and the second end portion  222   a  is longer than the first end portion  221   a . The first clamping arm  210   a  and the second clamping arm  220   a  are fastened together, the two half ring bodies form an open ring body, and the center of the ring body is the shaft hole  230   a . The first end portion  211   a  is fixedly connected to the first end portion  221   a . The second end portion  212   a  is provided with a through hole  213   a . The second end portion  222   a  is provided with a through hole  223   a . A gap  240   a  is formed between the second end portion  212   a  and the second end portion  222   a.    
     In some optional embodiments, the first end portion  211   a  may also be hingedly connected to the first end portion  221   a.    
     The inner shaft  310   a  is different from the inner shaft  310  in that the first radial hole  313  is not provided, but a flange  313   a  is formed at the tail end of the first end  311   a . The side surface of the flange  313   a  facing the second end  312   a  is the first limiting surface  314   a . In the assembly body, the flange  313   a  protrudes out of the end surface of the locking sleeve  330   a , the first limiting surface  314   a  faces the second limiting surface  334   a , and a ring groove is formed therebetween. 
     The difference between the locking sleeve  330   a  and the locking sleeve  330  is that the second radial hole  332  and the radial hole for installing the limiting pin  340  are not provided. The end surface of the locking sleeve  330   a  that is not adjacent to the second component  200   a  is the second limiting surface  334   a.    
     When the handle member  320  is rotated, there is an axial relative displacement between the inner shaft  310   a  and the locking sleeve  330   a , so that the first threaded needle  1  can be clamped or released. A recessed groove can also be provided on the side of the flange  313   a  to prevent the first threaded needle  1  from coming out in the radial direction. 
     In some optional embodiments, the inner shaft  310   a  and the second component  200   a  cannot rotate relative to each other. The position of the first threaded needle  1  in the annular groove formed by the first limiting surface  314   a  and the second limiting surface  334   a  is adjustable, so there is no need for rotational freedom between the inner shaft  310   a  and the second component  200   a.    
     In some optional embodiments, the inner shaft  310   a  and the second component  200   a  cannot rotate relative to each other, there is no circumferential limit between the locking sleeve  330   a  and the inner shaft  310   a , and the locking sleeve  330   a  and the inner shaft  310   a  can rotate relative to each other. In some other optional embodiments, the inner shaft  310   a  and the second component  200   a  cannot rotate relative to each other, there is no circumferential limit between the locking sleeve  330   a  and the inner shaft  310   a , and the locking sleeve  330   a  and the inner shaft  310   a  can rotate relative to each other, and a recessed groove is provided on the end surface of the locking sleeve  330   a . When the first threaded needle  1  is located in the recessed groove, the locking sleeve  330   a  can follow the rotation of the first threaded needle  1  around the inner shaft  310   a . This can not only ensure that the position of the first threaded needle  1  can be adjusted, but also prevent the first threaded needle  1  from coming out. 
     Referring to  FIG. 8 ,  FIG. 8  is a schematic structural diagram of a needle clamping device in another embodiment. Compared with the first needle clamping device shown in  FIG. 6 , the needle clamping device in the present embodiment uses the cam handle  320   b  instead of the handle member  320  to realize the locking function. Specifically, a cam handle  320   b  and a sleeve  360  are disposed on the second end  312   b  of the inner shaft  310   b , and the sleeve  360  is located between the second component  200  and the cam handle  320   b . When the cam handle  320   b  rotates, the sleeve  360  can be driven to squeeze the second component  200  so as to achieve locking. The cam handle  320   b  includes a cam portion and a handle portion, the cam portion is rotatably disposed on the second end  312   b , and the rotation center line is perpendicular to the inner shaft  310   b . When the cam handle  320   b  is toggled, the contour surface of the cam portion rotates along with it, and its rotational motion can be decomposed into the movement along the axial direction of the inner shaft  310   b , the movement and rotation along the radial direction of the inner shaft  310   b , which is equivalent to the movement of part of the structure of the cam handle  320   b  along the axial direction of the inner shaft  310   b.    
     In some optional embodiments, the sleeve  360  may not be provided, and the cam handle  320   b  may directly act on the second component  200 . In some other optional embodiments, a cylindrical cam can also be used to replace the cam handle  320   b . The cylindrical cam and the inner shaft  310   b  are coaxially arranged and can rotate relative to each other. The cam surface of the cylindrical cam is located on the end surface of the cylinder and faces the sleeve  360  in the assembly body, and the sleeve  360  is provided with a protrusion facing the cam surface. When the cylindrical cam is rotated, the interaction between the cam surface and the sleeve  360  causes an axial displacement therebetween, thereby compressing the second component  200 . 
     The leg support device of embodiments of the present application may further include a foot support  30 , and the foot support  30  is installed on the base  90   d . The foot support  30  can accommodate the foot of the patient, and the foot support  30  is slidably connected with the base  90   d , and the position of the foot support  30  relative to the base  90   d  can be adjusted. 
     Specifically, the foot support  30  is connected to the first sliding rail  91   d  by the foot support positioning device. The structures of the foot support  30 , the foot support positioning device and the connection between them are the same as those shown in  FIGS. 9 to 14 , and the specific structures can refer to the drawings and their descriptions, which will not be repeated here. 
     Referring to  FIGS. 9 to 13 ,  FIG. 9  is a cross-sectional view of the foot support positioning device and the foot support  30  in  FIG. 1 ;  FIG. 10  is an enlarged view of the foot support positioning device in  FIG. 9 ;  FIG. 11  is a perspective view of the foot support positioning device in  FIG. 1 ;  FIG. 12  is a schematic structural diagram of the locking block  300   m  in  FIG. 1 ;  FIG. 13  is a schematic structural diagram of the locking block driver  400   m  in  FIG. 1 . 
     The foot support positioning device includes a sliding block  100   m , a foot support connecting mechanism  200   m , a locking block  300   m , a locking block driver  400   m , and a pin  500   m . The sliding block  100   m  is the base for bearing and installation, and the foot support connection mechanism  200   m , the locking block  300   m , the locking block driver  400   m  and the pin  500   m  are all disposed on the sliding block  100   m.    
     The sliding block  100   m  is a rectangular plate structure. The bottom  120   m  of the sliding block  100   m  is provided with a chute  121   m , and the chute  121   m  is a dovetail slot. The upper surface of the sliding block  100   m  is the load surface  110   m , the load surface  110   m  is provided with a threaded hole  130   m  and a boss, and the boss is provided with a pin hole and a recessed portion. Both the pin hole and the threaded hole  130   m  are perpendicular to the plate body, and the threaded hole  130   m  is a through hole. The sliding block  100   m  is movably disposed on the sliding rail  12  of the base  90   d  through the chute  121   m.    
     The foot support connecting mechanism  200   m  includes a first tong arm  210   m , a second tong arm  220   m , a locking screw  230   m  and a pin  250   m , and an accommodating cavity  240   m  is provided between the first tong arm  210   m  and the second tong arm  220   m . The second tong arm  220   m  is fixedly connected to the sliding block  100   m , and in the present embodiment, they are integral structure. The first tong arm  210   m  is hingedly connected with the pin  250   m , and is connected in the pin hole of the boss through the pin  500   m . The accommodating cavity  240   m  corresponds to the recessed portion on the boss of the sliding block  100   m . The other ends of the first tong arm  210   m  and the second tong arm  220   m  are both provided with through holes, the through hole of the first tong arm  210   m  is a waist-shaped hole, and the through hole of the second tong arm  220   m  is a threaded hole. The threaded hole of the second tong arm  220   m  is a threaded hole of a nut embedded in the second tong arm  220   m , and the material of the nut can be a wear-reducing material. One end of the locking screw  230   m  is provided with a nut, the other end is provided with a radial through hole, and a thread is provided in the middle. The locking screw  230   m  is inserted into the through holes of the first tong arm  210   m  and the tong clamp arm  220   m , and the threaded section of the locking screw  230   m  and the threaded hole of the second tong arm  220   m  constitute a nut screw pair. The radial hole of the locking screw  230   m  is provided with a lever, and the lever is used to rotate the locking screw  230   m . In some optional embodiments, the second tong arm  220   m  is a separate part, one end of each of the first tong arm  210   m  and the second tong arm  220   m  is hinged into one body through a pin  250   m , and connected to the sliding block  100   m  through a pin  250   m.    
     The connection structure for clamping the foot support  30  is disposed in the accommodating cavity  240   m  of the foot support connecting mechanism  200   m . In the present embodiment, the connection structure of the foot support  30  is a foot support connecting rod  600   m , and the tail end of the foot support connecting rod  600   m  is provided with a ball head  610   m.    
     The locking block  300   m  includes a locking portion  310   m , an external thread portion  320   m  and a drive interface portion  330   m . The locking block  300   m  is a cylinder, the locking portion  310   m  and the external thread portion  320   m  are provided at both ends of the cylinder, and the external thread portion  320   m  is provided on the outer peripheral surface of the cylinder. A through hole is further provided in the center of the cylinder. The locking portion  310   m  is the end surface of the cylinder, and the end surface is used to abut the upper surface of the base  90   d . The drive interface portion  330   m  is a quincunx groove on the other end surface of the cylinder. The quincunx groove has an annular array of torque transmission portions  331   m , and the torque transmission portions  331   m  are recessed grooves along the radial direction of the cylinder, which can generate a torque of  300   m  on the locking block when the side wall of the recessed groove is forced. In the present embodiment, the number of recessed grooves of the quincunx groove is nine and the array angle interval of the recessed grooves is 40 degrees. The nine recessed grooves can be regarded as a set of torque transmission portions. The locking block  300   m  is disposed in the threaded hole  130   m  of the sliding block  100   m  through the external thread portion  320   m.    
     The locking block driver  400   m  includes a torque output portion  410   m  and a handle portion  420   m . Specifically, one tail end of the handle portion  420   m  is provided with a disc, and an end surface of the disc is provided with the torque output portion  410   m . The torque output portion  410   m  is a gear-shaped structure having an annular array of teeth  411   m . A through hole is provided in the center of the gear-shaped structure. The outer contour of the torque output portion  410   m  is the same as that of the drive interface portion  330   m , the torque output portion  410   m  is embedded in the drive interface portion  330   m , and the teeth  411   m  of the torque output portion  410   m  are embedded in the recessed grooves of the quincunx groove of the drive interface portion  330   m . The through hole  340   m  is coaxial with the through hole of the locking block driver  400   m.    
     The pin  500   m  is inserted into the through hole of the locking block  300   m  and the locking block driver  400   m , and limits the radial displacement between the locking block  300   m  and the locking block driver  400   m  together with the shaft snap ring. 
     When the locking block  300   m  is driven to rotate by the locking block driver  400   m , the locking block  300   m  can move axially relative to the sliding block  100   m  and abut against the base  90   d , so that the sliding block  100   m  is fixed on the base  90   d.    
     Upon assembly, the azimuth relationship between the locking block driver  400   m  and the locking block  300   m  can be set according to actual needs. For example, during the locking operation, the handle needs to be rotated, and the required force is the largest just before reaching the locking position. If the operating space of the handle is relatively small near the locking position, it will cause inconvenience in operation. It is therefore necessary to set the handle to have sufficient space between the handle and the surrounding structure in the locked state. Specifically, in the present solution, the locking block driver  400   m  is located below the foot support  30 , so the position of the locking block driver  400   m  shown in  FIG. 11  is in a locked state for convenient operation. Upon assembly, the foot support  30  is not installed first, the locking block  300   m  is screwed into the threaded hole  130   m  of the sliding block  100   m , the pin  500   m  is inserted into the through hole  340   m  of the locking block  300   m , and then the sliding block  100   m  is installed on the slide rail  12 . The locking block driver  400   m  is used to rotate the locking block  300   m  to lock the sliding block  100   m . At this time, the position of the locking block driver  400   m  relative to the sliding block  100   m  can be arbitrary. The locking block driver  400   m  is took out, the lock block driver  400   m  at the position shown in  FIG. 10  is installed, and then the locking block driver  400   m  is turned to release the locking block  300   m  from the base  90   d , the sliding block  100   m  is removed, such that the pin  500   m  protrudes from the through hole of the locking block driver  400   m  and a snap ring is used to achieve axial limit. 
     In some optional embodiments, the torque output portion  410   m  may be provided with a smaller number of teeth  411   m , such as three which are evenly distributed. In this case, the torque transmission portion  331   m  in the drive interface portion  330   m  is equivalent to three groups, and each group has three annular recessed grooves which are evenly distributed. 
     In some optional embodiments, the torque output portion  410   m  may be provided with a smaller number of teeth  411   m , such as one, two, three or four, and the angular interval between the teeth  411   m  is 40 degrees (equivalent to removing some adjacent teeth  411   m  of torque output  410   m  in  FIG. 12 ). 
     The foot support  30  is an “L”-shaped structure, which is similar to the shape of the foot and lower leg of a human body. The foot support  30  includes an “L”-shaped bottom plate and two side plates  31  on both sides of the bottom plate, and the space between the two side plates  31  is used for accommodating feet. The edge of the side plate  31  is provided with a notch  32 , and the outer side of the side plate  31  is provided with a limiting protrusion  33 . When the patient&#39;s foot is bound, the limiting protrusion  33  can prevent the bandage from slipping off. When the patient&#39;s foot is relatively thin, the bandage can pass through the notch  32 , which can effectively fix the foot. The bottom of the foot support  30  is provided with a foot support connecting rod  600   m , and the tail end of the foot support connecting rod  600   m  is provided with a ball head  610   m . The foot support  30  is installed in the accommodating cavity  240   m  of the foot support connecting mechanism  200   m  through the ball head  610   m , and the ball head  610   m  is clamped by the first tong arm  210   m  and the second tong arm  220   m.    
     Referring to  FIG. 14 ,  FIG. 14  is a schematic structural diagram of a locking block and a locking block driver in another embodiment. 
     In the present embodiment, the locking block driver  400   n  includes a torque output portion  410   n , a handle portion  420   n , a cylindrical base  430   n  and a positioning column  440   n . The cylindrical base  430   n  is provided at the tail end of the handle portion  420   n . The torque output portion  410   n  is provided on the outer circumferential surface of the cylindrical base  430   n . The positioning column  440   n  is disposed on the lower end surface of the cylindrical base  430   n . The drive interface portion  330   n  of the locking block  300   n  is a recessed groove on the end surface of the locking block  300   n , and the side wall of the recessed groove includes an arc surface portion  350   n  and a plurality of torque transmission portions  331   n . The torque transmission portion  331   n  is a recessed groove in the radial direction, and the shape is adapted to the torque output portion  410   n . The locking block  300   n  is further provided with a through hole  340   n  coaxial with the arc surface portion  350   n . The positioning post  440   n  can form a shaft hole matching with the through hole  340   n . The cylindrical base  430   n  and the arc surface portion  350   n  are also cylindrical surface matching, so in some embodiments, the positioning column  440   n  may not be provided. Four torque transmission portions  331   n  are provided, so there are four relative positional relationships between the locking block driver  400   n  and the locking block  300   n , which can be selected during assembly according to actual needs. 
     Although the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the application, particularly, provided that no structural conflict exists, each technical feature mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.