CN214805495U

CN214805495U - Leg support device

Info

Publication number: CN214805495U
Application number: CN202120247954.8U
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: 2020-10-16
Filing date: 2021-01-28
Publication date: 2021-11-23
Anticipated expiration: 2031-01-28
Also published as: CN114366530A

Abstract

The application discloses leg rest device includes: the foot support is arranged on the base, and the first support rod assembly and the second support rod assembly are respectively arranged on two sides of the base; and the first needle clamping device is connected with the first supporting rod assembly, and the second needle clamping device is connected with the second supporting rod assembly. The first supporting rod component is used for positioning the leg, so that the problem of poor stability and accuracy of hand-held fixation is solved.

Description

Leg support device

Technical Field

The present application relates to the technical field of medical equipment, and in particular, to a leg rest device.

Background

The knee joint is an important load bearing joint of the lower limb of the human body, and has a complex structure and higher requirements on the motion function. Knee joint diseases are common diseases of middle-aged and elderly people, and knee joint replacement is usually required for severe knee joint diseases, so that knee joint pain of patients is relieved, knee joint functions are improved, knee joint deformities are corrected, long-term stability is obtained, and the like.

The operation position not only ensures the safety of the patient, but also meets the requirement of the doctor on the operation space. In a traditional knee joint replacement operation, a doctor assistant is generally required to fix the knee joint of a patient in a hand-held manner, so that the position of an operation body is ensured, but the stability and accuracy of the hand-held fixing manner are poor, and the probability of operation failure is increased.

SUMMERY OF THE UTILITY MODEL

The application provides a leg rest device, aims at solving the relatively poor problem of stability and accuracy of hand fixed mode.

The application provides a leg rest device, include: the foot support is arranged on the base, and the first support rod assembly and the second support rod assembly are respectively arranged on two sides of the base; and the first needle clamping device is connected with the first supporting rod assembly, and the second needle clamping device is connected with the second supporting rod assembly.

In a first possible implementation manner, the first needle clamping device includes: a first member having a shaft portion connected to the first support rod assembly; the second component comprises a first clamping arm and a second clamping arm which are arranged side by side, the first clamping arm is provided with a first end part and a second end part, the second clamping arm is provided with a first end part and a second end part, the first end part of the first clamping arm is connected with the first end part of the second clamping arm, a preset distance is reserved between the second end part of the first clamping arm and the second end part of the second clamping arm, a shaft hole is reserved between the first clamping arm and the second clamping arm, and the first clamping arm and the second clamping arm are rotatably connected with the shaft part through the shaft hole; and a clamping mechanism comprising: the inner shaft is provided with a first end and a second end, penetrates through the second end of the first clamping arm and the second end of the second clamping arm and can move relative to the second end of the first clamping arm and the second end of the second clamping arm, the first end and the second end of the inner shaft are distributed on two sides of the second part, and the first end is provided with a first limiting surface; the handle piece is movably arranged at the second end of the inner shaft and is in contact with the second end of the first clamping arm, and at least part of structure of the handle piece can move axially in the inner shaft when moving relative to the inner shaft; the locking sleeve is provided with a through hole and sleeved outside the first end of the inner shaft, the locking sleeve can move relative to the inner shaft, the locking sleeve is contacted with the second end part of the second clamping arm, the locking sleeve is provided with a second limiting surface, and the second limiting surface and the first limiting surface of the inner shaft are arranged face to face or obliquely face to face; wherein the second part constitutes an axial limitation of the handle part and the locking sleeve on the inner shaft.

In combination with the above possible implementation manners, in a second possible implementation manner, a first radial hole is radially formed in the first end of the inner shaft, a hole wall portion of an end surface of the first radial hole, which faces away from the first end, is a first limiting surface, a second radial hole is radially formed in the locking sleeve, a hole wall portion of the second radial hole, which is in the same direction as the end surface of the first end of the inner shaft, is a second limiting surface, and the first limiting surface and the second limiting surface are arranged in an obliquely opposite manner.

In combination with the above possible implementation manners, in a third possible implementation manner, the first end of the inner shaft is located in the locking sleeve, and the limiting rod is arranged in the locking sleeve.

With reference to the foregoing possible implementation manner, in a fourth possible implementation manner, a flange is arranged at the first end of the inner shaft in a protruding manner along the radial direction, the flange is located at a side portion of one end of the locking sleeve away from the second part, a gap is formed between the flange and the end of the locking sleeve away from the second part, one side surface of the flange facing the locking sleeve is a first limiting surface, and an end surface of the first end facing the flange is a second limiting surface.

In combination with the above possible implementation manners, in a fifth possible implementation manner, the handle part includes a cylindrical portion and a handle portion, the cylindrical portion is connected with the handle portion, the handle portion protrudes out of the cylindrical portion along the radial direction, the cylindrical portion and the handle portion are sleeved outside the second end of the inner shaft and are in threaded connection with the second end of the inner shaft, one end of the handle portion is in contact with the second end of the first clamping arm, and when the handle portion rotates, the inner shaft can be driven to move along the axial direction and the locking sleeve is driven to extrude the second end of the second clamping arm.

In combination with the above possible implementation manners, in a sixth possible implementation manner, the handle part 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, and when the handle portion rotates to drive the cam portion to rotate, the inner shaft can be driven to move axially, and the locking sleeve is driven to extrude the second end portion of the second clamping arm.

With reference to the above possible implementation manners, in a seventh possible implementation manner, the inner shaft and the locking sleeve are in circumferential limit connection.

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

With reference to the above possible implementation manners, in a ninth possible implementation manner, an elastic member is further disposed between the first end of the inner shaft and the locking sleeve, and the elastic member acts on the inner shaft and makes the inner shaft have a tendency of protruding toward the outside of the locking sleeve.

In combination with the above possible implementations, in a tenth possible implementation, the first end of the first clamping arm and the first end of the second clamping arm are fixedly connected or hinged.

In combination with the above possible implementation manners, in an eleventh possible implementation manner, positions between the first support bar and/or the second support bar and the base along the length direction of the side of the base are adjustable.

In combination with the above possible implementation manners, in a twelfth possible implementation manner, the leg support device further includes a second slider and a locking mechanism, the base is provided with a second slide rail, the first support rod assembly and/or the second support rod assembly are/is slidably connected to the second slide rail through the second slider, and the locking mechanism is respectively connected to the second slider and the base and used for locking the second slider.

Compared with the prior art, the embodiment of the application has the following advantages:

first bracing piece subassembly and second bracing piece subassembly of this application embodiment are connected with the base, and to the shank location through first bracing piece subassembly and second bracing piece subassembly, the foot holds in the palm the foot location, has avoided the relatively poor problem of hand fixed stability and accuracy. And the first supporting rod component and the second supporting rod component are respectively arranged at two sides of the base, and the space between the first supporting rod component and the second supporting rod component and the upper surface of the base can be used for straightening and horizontally placing the affected limb in the operation process or after the operation is finished so as to check the tension of the joint ligament, so that the leg support device does not need to be moved away from the operation bed so as to make the space to horizontally place the affected limb.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a leg rest arrangement;

FIG. 2 is a schematic structural diagram of the base in FIG. 1;

FIG. 3 is a schematic view of the arrangement of the column of FIG. 1 for connection to a base;

FIG. 4 is a schematic view of the structure between the vertical column and the upright of FIG. 1;

FIG. 5 is a schematic structural view of the needle clamping device shown in FIG. 1;

FIG. 6 is a schematic structural view of the needle clamping device;

FIG. 7 is a schematic structural view of a needle clamping device in another embodiment;

FIG. 8 is a schematic structural view of a needle clamping device in another embodiment;

FIG. 9 is a cross-sectional view of the foot rest positioning device and foot rest of FIG. 1;

FIG. 10 is an enlarged view of the footrest positioning device of FIG. 9;

FIG. 11 is a perspective view of the footrest positioning device of FIG. 1;

FIG. 12 is a schematic structural view of the locking block of FIG. 1;

FIG. 13 is a schematic view of the locking block actuator of FIG. 1;

FIG. 14 is a schematic view of another embodiment of a locking block and locking block actuator;

in the drawings, the drawings are not necessarily drawn to scale.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

For a better understanding of the present application, embodiments of the present application are described below with reference to fig. 1 to 14.

Referring to fig. 1, fig. 1 is a schematic structural view of a leg rest arrangement in one embodiment of the present disclosure. The leg support device can be applied to surgical operations for supporting and fixing affected limbs such as legs, for example, a femur can be fixed in a total knee replacement operation.

The embodiment of the present application provides a leg rest device, it includes: the base 90d, the first support rod assembly 10d, the second support rod assembly 20d, the first needle clamping device and the second needle clamping device, and the structures of the first needle clamping device and the second needle clamping device can be the same.

The base 90d serves as a mounting and supporting base for the device, and the first support rod assembly 10d and the second support rod assembly 20d are mounted on the base 90 d.

Referring to fig. 1, in some alternative embodiments, the supporting bases of the two needle clamping devices are two independent supporting rod structures, namely a first supporting rod assembly 10d and a second supporting rod assembly 20 d. The first and second strut assemblies 10d and 20d are each detachably connected to the base 90d so that either a left or right needle holder device can be selectively installed depending on the leg to be operated. Therefore, the occupied operation space can be reduced, and the operation around the knee joint of the human body is convenient. And, the need for pre-operative instrument sterilization can also be reduced, as only the support rod assembly that needs to be mounted to the base 90d needs to be sterilized.

There is no cross beam between the first support rod assembly 10d and the second support rod assembly 20d, so during or after the operation, the doctor can directly lay the patient's leg flat for joint flexion and extension observation without removing the leg support device. In addition, the surgeon can choose to install only the first strut assembly 10d or the second strut assembly 20d, without having to install both, according to the ease of operation, reducing the number of operating steps and the amount of operating space occupied near the knee joint. The position of the supporting rod component on the sliding rail can be adjusted through the sliding block at the bottom, so that more clinical conditions can be adapted.

The first support rod assembly 10d and the second support rod assembly 20d can be connected with the base 90d in a sliding manner, and the first support rod assembly 10d and the second support rod assembly 20d can slide relative to the base 90d and can finely adjust the positions of the legs; of course, a locking mechanism may be provided between first brace assembly 10d, second brace assembly 20d and base 90d for locking the relative positions of first brace assembly 10d, second brace assembly 20d and base 90 d.

Referring to fig. 2, specifically, the base 90d is an i-shaped bottom plate, a first slide rail 91d is disposed in the middle, and a second slide rail 92d and a third slide rail 93d are disposed on two sides of one end of the first slide rail 91d, respectively.

The first supporting rod assembly 10d and the second supporting rod assembly 20d are symmetrically arranged on two sides of the first sliding rail 91d, and the two needle clamping devices are also symmetrically arranged.

Referring to fig. 1, 3 and 4, the first support rod assembly 10d is illustrated as an example.

The lower end of the vertical tube 11d is connected to the second slide rail 92d of the base 90d through the second slider 100e, and is controlled by the locking block 300e, the locking block driving member 400e and the pin 500e to be locked with the second slide rail 92 d. The structures and the connection relations of the second slider 100e, the latch block 300e, the latch block driving piece 400e, and the pin 500e are the same as those of the slider 100m, the latch block 300m, the latch block driving piece 400m, and the pin 500m in fig. 10 to 14, and their modifications.

The upper end of the vertical tube 11d is provided with a clamping device which can lock the upright 12d inserted into the vertical tube 11 d. The clamping device comprises a cam handle 13d, a first clasping arm 14d, a second clasping arm 15d and a locking screw 16 d. One end of the first enclasping arm 14d is hinged to one end of the second enclasping arm 15d, the middle parts of the first enclasping arm and the second enclasping arm are provided with arc-shaped clamping parts, and a gap is formed between the other ends of the first enclasping arm and the second enclasping arm. The cam knob 13d is provided at a portion where the two clasping arms are provided with a gap, and the distance between the clasping arms is changed by the cam portion to achieve a clasping action. The cam knob 13d and the nut and the rotating shaft and the like constitute a cam knob assembly for effecting the clamping of the clamp arm. The locking screw 16d can also lock the column 12d in the vertical tube 11d from the radial direction. Of course, the locking mechanism is not exclusive, and for example, the locking screw 16d may not be provided, only the locking screw 16d may be provided, or a clamping structure in the needle clamping device may be adopted.

The upright post 12d is inserted into the vertical cylinder 11d, and the cam handle 13d can be released to adjust the insertion depth when necessary, so as to change the height of the needle clamping device at the top end of the upright post 12d relative to the base 90 d.

In some alternative embodiments, the first support rod assembly 10d may also be replaced with a support rod/arm having a fixed length, i.e., a fixed connection between the vertical tube 11d and the vertical column 12d, both of which are not axially adjustable in length.

In alternative embodiments, the first and second strut assemblies 10d, 20d may be connected to the base 90d in other ways. Such as directly secured to the base 90d with screws, bolts, or other fastening structures.

In some alternative embodiments, only the first support bar assembly 10d or only the second support bar assembly 20d may be provided. When in use, the first support rod assembly 10d can be mounted on the first slide rail 91d or the second slide rail 92d of the base 90d according to actual needs. Specifically, the first support rod assembly 10d may be mounted on the third slide rail 93d in the posture of fig. 1; the first support rod assembly 10d may also be rotated 180 degrees around its long axis relative to the posture of fig. 1 and then mounted on the third slide rail 93d, so that the needle clamping device is still located at the outer side for convenient operation.

The first needle clamping device and the second needle clamping device are respectively arranged on the top of the first support rod assembly 10d and the second support rod assembly 20. The first clamping means are capable of clamping the first threaded needle 1. Before clamping the first needle threading device 1, the first needle clamping device has two rotational degrees of freedom relative to the first support rod assembly 10d, and an operator can flexibly adjust the direction of the first needle threading device 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 and the first support rod assembly 10d can be locked only by screwing once, and the operation is simple and convenient. The second needle clamping device and the second screw-thread needle have the connection relation.

In some alternative embodiments, the second needle clamping device can be replaced by other needle clamping devices; in other alternative embodiments, the second needle clamping device can be replaced by a fastening mechanism such as a binding band. As long as be provided with first clamp needle device, just can reduce the complex operation degree of locking and the in-process of unclamping the screw needle to a certain extent.

The structure of the needle clamping device will be specifically described below by taking the first needle clamping device as an example, with reference to fig. 5 and 6. FIG. 5 is a schematic structural view of the first needle clamping device in FIG. 1; fig. 6 is a sectional view of the first needle clamping device, wherein a sectional plane passes through the center line of the first threaded needle 1 and is perpendicular to the first support bar assembly.

The first needle clamping device includes a first member 100, a second member 200, and a clamping mechanism 300. The first member 100 is provided on the first support bar assembly 10 d. In the unlocked state, the second member 200 is rotatable relative to the first member 100, and the entire clamping mechanism 300 is rotatable relative to the second member 200 with the axes of the two rotational movements in a spatially perpendicular relationship. The above-described coupling facilitates adjusting the implantation instrument to a desired implantation orientation prior to the implantation procedure.

The first component 100 includes a shaft portion 110. The shaft 110 is disposed at the top end of the first support rod assembly 10 d. The circumferential surface of the end of the shaft 110 is provided with a ring groove for mounting a snap ring for axial position limitation.

The second member 200 includes a first gripper arm 210 and a second gripper 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, i.e., a gap 240. A shaft hole 230 is further provided between the first and second clamp arms 210 and 220.

In the illustrated embodiment, the second member 200 is a split ring structure and may be formed by milling and slitting a generally rectangular parallelepiped blank, with slits formed in a solid body around the perimeter of the hole and radially along the hole, the hole and slits being in communication. The solid structure around the hole is a main ring body, and the solid structures at both sides of the slit 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 a dotted line m in fig. 6), 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. 6), 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 second member 200 has the same diameter as the shaft 110 of the first member 100, and the shaft hole and the shaft are engaged with each other to form a rotational connection. 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 clamping mechanism 300 includes an inner shaft 310, a handle piece 320, a locking sleeve 330, a spacing pin 340, and a spring 350.

The inner shaft 310 extends through the second end 212 and the second end 222 of the second member. The first end 311 and the second end 312 of the inner shaft 310 are distributed on two 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 method comprises the following steps: 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 first end 311 is a square shaft, the outer circumference of the square shaft is four flat surfaces, and a transition step is arranged between the square shaft and the second end 312. The square shaft is also provided with a first radial hole 313. The first limiting surface 314 is a hole wall portion of the first radial hole 313 facing the second end 312, i.e., a right half hole wall of the first radial hole 313 in the drawing. When the first needle 1 is locked, the hole wall of the part contacts and presses the first needle 1, thereby defining it as a first limit surface. Part of the wall surface of the circular hole is an implementation manner of the first limiting surface, and in some alternative embodiments, the first radial hole 313 may also be a concave structure disposed along the radial direction, such as a kidney-shaped hole, a square hole, or a groove, and the first limiting surface is a 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 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 radially from the outer surface of the cylindrical portion 321. The threaded hole 322 penetrates the cylindrical portion 321. Handle piece 320 forms a nut and screw mechanism with the external thread of inner shaft 310 via threaded hole 322, and handle piece 320 can simultaneously move axially within inner shaft 310 when rotating on inner shaft 310.

The locking sleeve 330 is provided at the center thereof 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 disposed diagonally opposite to the first limiting surface 314 of the inner shaft 310. Specifically, the method comprises the following steps: the maximum diameter of the through hole 331 (right half of fig. 6) is a square hole, which is sized to match and form a circumferential limit fit with the square shaft of the first end 311 of the inner shaft 310. 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 a through hole 331, and a second limiting surface 333 and a second limiting surface 334 are hole wall portions of the two sections which are in the same direction as the end surface of the first end 311. When the first needle 1 is locked, the hole wall will contact and press the first needle 1, thus defining it as a second stop surface. Part of the wall surface of the circular hole is only one embodiment of the second limiting surface, and in some alternative embodiments, the second radial hole 332 may also be a kidney-shaped hole, a square hole, or a groove, etc. which are radially disposed, and the second limiting surface is a hole wall portion (a hole wall portion facing away from the second component 200) of the recess structure, which is aligned with the end surface of the first end 311, and the hole wall portion may be a plane surface or a curved surface. The locking sleeve 330 is disposed outside the first end 311 of the inner shaft 310. The locking sleeve 330 is axially movable relative to the inner shaft 310.

The locking sleeve 330 is also provided with a radial hole for mounting the stopper pin 340, which is located outside the second radial hole 332 (to the right of the second radial hole 332 in fig. 6). The limit pin 340 is inserted into the radial hole of the locking sleeve 330 and located outside the end surface of the first end 311 to form an axial limit structure for the inner shaft 310.

The spring 350 is disposed on the inner shaft 310 and located in the through hole 331 of the locking sleeve 330. One end of the spring 350 abuts against one step of the through hole 331 and the other end abuts against a shoulder of the transition step of the inner shaft 310. The spring 350 tends to project the first end 311 outward (to the right in fig. 6) from the through-hole 331 (tending to move the locking sleeve 330 toward the second end 312 of the inner shaft 310).

The handle member 320 and the locking sleeve 330 are located on either side of the second member 200. The handle member 320 and the locking sleeve 330 are both movable along the axial direction of the inner shaft 310, and when the handle member 320 and the locking sleeve 330 approach each other, the second member 200 can clamp the shaft 110 under the clamping of the handle member and the locking sleeve, thereby eliminating two rotational degrees of freedom of the first needle clamping device.

Description of the procedure:

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

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

The handle member 320 is rotated to be adjacent to the locking sleeve 330. In this process, the inner shaft 310 pulls the first needle 1 and the locking sleeve 330 together toward the handle member 320. Locking sleeve 330 acts on second end 222 of second member 200 and handle member 320 acts on second end 212 such that first and second clamp arms 210 and 220 clamp shaft portion 110. In addition, the first limit surface 314 of the inner shaft 310 and the

second limit surface

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

In the above operation, the clamping mechanism 300 has two rotational degrees of freedom with respect to the first member 100, and thus the adjustment range of the screw-thread needle is large. The first thread needle 1 can be clamped between the inner shaft 310 and the locking sleeve 330 only by rotating the handle piece 320, so that the inner shaft 310 and the handle piece 320 are locked with the second component 200 and the second component 200 is locked with the first component 100, and the operation is convenient, time-saving and labor-saving. In addition, the first radial hole 313 and the second radial hole 332 in the clamping mechanism 300 can also guide and support the first screw-needle 1 during driving the first screw-needle 1 into the patient's bone, and the operator can hold the clamping mechanism 300 to prevent the first screw-needle 1 from being displaced. The cooperation of the stopping pin 340 and the spring 350 also enables the second radial hole 332 to be automatically aligned with the first radial hole 313, thereby facilitating the rapid insertion of the first needle 1. The contact line of the first screw 1 and the first radial hole 313 is parallel to the contact line of the first screw 1 and the second radial hole 332, and the contact lines are long, so that the first screw 1 is stressed uniformly and locked firmly.

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

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

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

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

Referring to fig. 7, fig. 7 is a schematic structural view of a needle clamping device in another embodiment. The structure of the needle clamping device in this embodiment is substantially the same as the structure and principle of the first needle clamping device shown in fig. 6, and the differences include: the second part 200a is a split structure, and the second part 200 is an integral structure; the inner shaft 310a and the locking sleeve 330a are not provided with radial holes, but clamp the first needle thread 1 through a gap therebetween; and, there is no limit pin between the inner shaft 310a and the locking sleeve 330a for axial limit. The following description specifically describes differences in the structures of the second member 200a, the inner shaft 310a, and the locking sleeve 330 a.

The second member 200a is formed by connecting 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 with the first end portion 221 a. The second end portion 212a is provided with a through hole 213 a. The second end portion 222a is provided with a through hole 223 a. A gap 240a is provided between the second end 212a and the second end 222 a.

In some alternative embodiments, the first end 211a and the first end 221a may be hinged.

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

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

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

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

surfaces

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

In some alternative embodiments, the inner shaft 310a and the second member 200a cannot rotate relative to each other, and the locking sleeve 330a and the inner shaft 310a are not limited circumferentially and can rotate relative to each other. In other alternative embodiments, the inner shaft 310a and the second member 200a cannot rotate relative to each other, the locking sleeve 330a and the inner shaft 310a are not limited circumferentially and can rotate relative to each other, and a groove is formed on an end surface of the locking sleeve 330 a. When the first needle 1 is located in the groove, the locking sleeve 330a can follow during the rotation of the first needle 1 around the inner shaft 310 a. This ensures that the first needle 1 can be adjusted in position and prevents the first needle 1 from coming out.

Referring to fig. 8, fig. 8 is a schematic structural view 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 embodiment uses the cam handle 320b to replace the handle member 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 second member 200 and the cam handle 320b, and the cam handle 320b can drive the sleeve 360 to press the second member 200 for locking when rotating. The cam knob 320b includes a cam portion rotatably disposed on the second end 312b with a center line of rotation perpendicular to the inner shaft 310b and a knob portion. When the cam knob 320b is pulled, the contour surface of the cam portion rotates, and the rotation motion can be decomposed into the axial movement of the inner shaft 310b, the radial movement and the rotation along the inner shaft 310b, which is equivalent to the axial movement of the partial structure of the cam knob 320b in the inner shaft 310 b.

In alternative embodiments, the sleeve 360 may not be provided and the cam knob 320b may act directly on the second member 200. 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 arranged on the end surface of the cylinder, the assembling 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 second component 200 is pressed.

The leg rest arrangement of the embodiments of the present application may further include a foot rest 30, the foot rest 30 being mounted on the base 90 d. The foot rest 30 can accommodate the foot of the patient, and the foot rest 30 is slidably connected with the base 90d, so that the position of the foot rest 30 relative to the base 90d can be adjusted.

Specifically, the foot rest 30 is connected to the first slide rail 91d by a foot rest positioning device. The structures of the foot rest 30 and the foot rest positioning device and the connection relationship between the two are the same as those shown in fig. 9 to 14, and the specific structures can refer to the drawings and the description thereof, which are not repeated herein.

Referring to fig. 9-13, fig. 9 is a cross-sectional view of the foot rest positioning device and foot rest 30 of fig. 1; FIG. 10 is an enlarged view of the footrest positioning device of FIG. 9; FIG. 11 is a perspective view of the footrest positioning device of FIG. 1; FIG. 12 is a schematic structural view of the locking block 300m of FIG. 1; fig. 13 is a schematic structural view of the locking block driving member 400m of fig. 1.

The foot support positioning device comprises a sliding block 100m, a foot support connecting mechanism 200m, a locking block 300m, a locking block driving piece 400m and a pin 500 m. The slider 100m is a bearing and mounting foundation, and the foot support connecting mechanism 200m, the locking block 300m, the locking block driving piece 400m and the pin 500m are all arranged on the slider 100 m.

The slider 100m has a rectangular plate structure. The bottom 120m of the slider 100m is provided with a sliding groove 121m, and the sliding groove 121m is a dovetail groove. The upper surface of the slider 100m is a load surface 110m, and the load surface 110m is provided with a threaded hole 130m and a boss, and the boss is provided with a pin hole and a concave part. The pin hole and the threaded hole 130m are perpendicular to the plate body, and the threaded hole 130m is a through hole. The slider 100m is movably disposed on the slide rail 12 of the base 90d through the slide groove 121 m.

The foot rest connecting mechanism 200m comprises a first clamp arm 210m, a second clamp arm 220m, a locking screw 230m and a pin 250m, and an accommodating cavity 240m is arranged between the first clamp arm 210m and the second clamp arm 220 m. The second clamp arm 220m is fixedly connected to the slider 100m, and is an integral structure in this embodiment. The first clamp arm 210m is hinged with the pin 250m and is connected in the pin hole of the boss through the pin 500 m. Wherein the receiving cavity 240m corresponds to a recess on a boss of the slider 100 m. The other ends of the first forceps arm 210m and the second forceps arm 220m are provided with through holes, the through hole of the first forceps arm 210m is a waist-shaped hole, and the through hole of the second forceps arm 220m is a threaded hole. The threaded hole of the second clamp arm 220m is a threaded hole of a nut embedded in the second clamp arm 220m, and the nut can be made of an anti-wear material. One end of the locking screw 230m is provided with a nut, the other end is provided with a radial through hole, and the middle part is provided with a thread. The locking screw 230m is inserted into the through holes of the first clamp arm 210m and the second clamp arm 220m, and the thread section of the locking screw 230m and the threaded hole of the second clamp arm 220m form a nut-screw pair. The radial hole of the locking screw 230m is provided with a deflector rod for rotating the locking screw 230 m. In alternative embodiments, the second jawarm 220m is a separate component, and each of the first and

second jawarms

210m and 220m is integrally hinged at one end by a pin 250m and connected to the slider 100m by a pin 250 m.

The connecting structure for clamping the foot support 30 in the accommodating cavity 240m of the foot support connecting mechanism 200m, in this embodiment, the connecting structure for the foot support 30 is a foot support connecting rod 600m, and the tail end of the foot support connecting rod 600m is provided with a ball head 610 m.

The locking block 300m includes a locking portion 310m, a male threaded portion 320m, and a drive interface portion 330 m. The locking block 300m is a cylinder, and a locking portion 310m and an external screw portion 320m are provided at both ends of the cylinder, and the external screw portion 320m is provided at an outer circumferential surface of the body. The center of the column body is also provided with a through hole. The locking portion 310m is an end surface of the cylinder, and the end surface is used for abutting against the upper surface of the base 90 d. The driving interface portion 330m is a quincunx groove on the other end surface of the column. The quincuncial groove is provided with a torque transmission part 331m in an annular array, the torque transmission part 331m is a groove along the radial direction of the cylinder, and when force is applied to the side wall of the groove, the torque of the locking block 300m can be generated. In this embodiment, the number of the grooves of the plum blossom groove is 9, and the array angle interval of the grooves is 40 degrees. The 9 grooves can be considered as a set of torque transmitting portions. The locking block 300m is disposed in the screw hole 130m of the slider 100m through the male screw portion 320 m.

The locking block driver 400m includes a torque output portion 410m and a handle portion 420 m. Specifically, the handle portion 420m is provided at one end thereof with a circular disk, and an end surface thereof is provided with the torque output portion 410 m. The torque output 410m is a gear-like structure having an annular array of teeth 411 m. The center of the gear-shaped structure is provided with a through hole. The outer profile of the torque output part 410m is the same as the outer profile of the drive interface part 330m, the torque output part 410m is embedded in the drive interface part 330m, and the teeth 411m of the torque output part 410m are embedded in the grooves of the plum blossom grooves of the drive interface part 330 m. The through hole 340m is coaxial with the through hole of the locking block driving member 400 m.

The pin 500m is inserted into through holes of the locking block 300m and the locking block driving member 400m, and restricts radial displacement between the locking block 300m and the locking block driving member 400m together with the shaft snap ring.

When the locking block 300m is driven to rotate by the locking block driving member 400m, the locking block 300m can move in the axial direction relative to the slider 100m and abut against the base 90d, so that the slider 100m is fixed on the base 90 d.

During assembly, the orientation relation between the locking block driving piece 400m and the locking block 300m can be set according to actual requirements. For example, the locking operation requires turning the handle, and the force required immediately before the locking position is reached is the greatest, which may cause inconvenience if the operating space of the handle is small in the vicinity of the locking position. It is therefore necessary to set the handle so that there is sufficient space between the handle and the surrounding structure in the locked state. In particular, in this embodiment, the locking block actuator 400m is positioned below the foot rest 30, thereby facilitating operation when the locking block actuator 400m is in the locked position as shown in FIG. 11. During assembly, the foot support 30 is not installed, the locking block 300m is screwed into the threaded hole 130m of the sliding block 100m, the pin 500m is inserted into the through hole 340m of the locking block 300m, and then the sliding block 100m is installed on the sliding rail 12. The slider 100m is locked by rotating the locking block 300m using the locking block driving member 400m, and the position of the locking block driving member 400m with respect to the slider 100m at this time may be arbitrary. The locking block driving member 400m is taken out, the locking block driving member 400m is installed at the position shown in fig. 10, then the locking block driving member 400m is rotated to release the locking block 300m from the base 90d, the slide block 100m is disassembled, and the pin 500m protrudes from the through hole of the locking block driving member 400m and is axially limited by the snap ring.

In some alternative embodiments, the torque output 410m may be provided with a smaller number of teeth 411m, such as 3 evenly spaced. In this case, the torque transmitting portions 331m of the drive interface portion 330m are equivalent to three sets of 3 annularly-spaced grooves.

In alternative embodiments, the torque output 410m may be provided with a fewer number of teeth 411m, such as 1, 2, 3, or 4, with the teeth 411m being angularly spaced 40 degrees apart (corresponding to the elimination of some adjacent teeth 411m of the torque output 410m in fig. 12).

The foot rest 30 is an L-shaped structure, similar to the shape of the feet and the lower legs of the human body. The foot rest 30 comprises an L-shaped bottom plate and two side plates 31 at 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 limit projection 33. The stopper protrusion 33 prevents the band from slipping off when the patient's foot is bound. When the foot of the patient is thin, the binding band can penetrate through the notch 32, and the foot can be effectively fixed. The bottom of the foot support 30 is provided with a foot support connecting rod 600m, and the tail end of the foot support connecting rod 600m is provided with a ball head 610 m. The foot rest 30 is mounted in the receiving cavity 240m of the foot rest connecting mechanism 200m through the ball 610m, and the ball 610m is clamped by the first and second clamp

arms

210m and 220 m.

Referring to fig. 14, fig. 14 is a schematic view of another embodiment of a locking block and locking block actuator.

The locking block drive 400n in this embodiment includes a torque output portion 410n, a handle portion 420n, a cylindrical base 430n, and a locating post 440 n. A cylindrical base 430n is provided at the distal end of the handle portion 420 n. The torque output portion 410n is provided on the outer circumferential surface of the cylindrical base 430 n. The positioning column 440n is disposed on the lower end surface of the cylindrical base 430 n. The drive interface 330n of the lock block 300n is a recess in an end face of the lock block 300n, the side wall of the recess including an arcuate surface portion 350n and a plurality of torque transmitting portions 331 n. The torque transmission portion 331n is a groove in the radial direction, and is shaped to fit the torque output portion 410 n. The locking block 300n is also provided with a through hole 340n coaxial with the arc surface portion 350 n. The positioning post 440n can form a shaft hole fit with the through hole 340 n. Cylindrical base 430n is also a cylindrical fit with arcuate portion 350n, and thus, in some embodiments, locating post 440n may not be provided. The number of the torque transmission portions 331n is 4, so that there is 4 relative positional relationships between the locking block driving member 400n and the locking block 300n, which can be selected according to actual needs during assembly.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. Leg rest arrangement, characterized in that includes:

a base;

the foot support is arranged on the base;

the first supporting rod assembly and the second supporting rod assembly are respectively arranged on two sides of the base; and

the first needle clamping device is connected with the first supporting rod assembly, and the second needle clamping device is connected with the second supporting rod assembly.

2. The leg rest arrangement of claim 1, wherein the first clip means comprises:

a first member having a shaft portion connected to the first support bar assembly;

the second component comprises a first clamping arm and a second clamping arm which are arranged side by side, the first clamping arm is provided with a first end part and a second end part, the second clamping arm is provided with a first end part and a second end part, the first end part of the first clamping arm is connected with the first end part of the second clamping arm, a preset distance is reserved between the second end part of the first clamping arm and the second end part of the second clamping arm, a shaft hole is reserved between the first clamping arm and the second clamping arm, and the first clamping arm and the second clamping arm are rotatably connected with the shaft part through the shaft hole; and

a clamping mechanism comprising:

the inner shaft is provided with a first end and a second end, penetrates through the second end of the first clamping arm and the second end of the second clamping arm and can move relative to the second end of the first clamping arm and the second end of the second clamping arm, the first end and the second end of the inner shaft are distributed on two sides of the second part, and the first end is provided with a first limiting surface;

a handle member movably disposed at the second end of the inner shaft and in contact with the second end of the first clamping arm, at least a portion of the structure being axially movable within the inner shaft when the handle member is moved relative to the inner shaft; and

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

wherein the second part constitutes an axial stop of the handle part and the locking sleeve on the inner shaft.

3. The leg rest arrangement of claim 2, wherein the first end of the inner shaft is radially perforated with a first radial hole, a wall portion of the first radial hole facing away from the end face of the first end is the first stop surface, the locking sleeve is radially perforated with a second radial hole, a wall portion of the second radial hole facing the end face of the first end of the inner shaft is the second stop surface, and the first stop surface and the second stop surface are disposed diagonally opposite one another.

4. The leg rest arrangement of claim 3, wherein the first end of the inner shaft is located within the locking sleeve, the locking sleeve having a stop bar disposed therein.

5. The leg rest arrangement of claim 2, wherein the first end of the inner shaft is provided with a radially protruding flange, the flange is located at an end side of the locking sleeve facing away from the second member, a gap is provided between the flange and the end of the locking sleeve facing away from the second member, one 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.

6. The leg rest arrangement of any one of claims 2 to 5, wherein the handle member comprises a barrel portion and a handle portion, the barrel portion and the handle portion being connected, the handle portion projecting radially outwardly of the barrel portion, the barrel portion and the handle portion being received over and threadably connected to the second end of the inner shaft, one end of the handle portion being in contact with the second end of the first clamp arm, the handle portion being rotatable to cause the inner shaft to move axially and the locking sleeve to compress the second end of the second clamp arm.

7. A leg rest arrangement as claimed in any one of claims 2 to 5 wherein the handle member is a cam handle comprising a cam portion and a handle portion, the cam portion being connected to the handle portion, the cam portion being pivotally connected to the second end of the inner shaft, rotation of the handle portion causing the cam portion to rotate causing the inner shaft to move axially and the locking sleeve to compress against the second end of the second clamp arm.

8. A leg rest arrangement as claimed in any one of claims 2 to 5, wherein the inner shaft and locking sleeve are in a circumferential limit connection.

9. The leg rest arrangement of claim 8, wherein the outer circumference of the inner shaft includes at least one planar region parallel to the inner shaft, and the inner circumference of the through hole of the locking sleeve is provided with a mating surface for mating with the planar region, the mating surface and the planar region abutting to form the circumferential limit.

10. A leg rest arrangement according to any one of claims 2 to 5 wherein a resilient member is provided between the first end of the inner shaft and the locking sleeve, the resilient member acting on the inner shaft and tending to cause the inner shaft to project outwardly of the locking sleeve.

11. A leg rest arrangement as claimed in any one of claims 2 to 5, wherein the first end of the first clamp arm and the first end of the second clamp arm are fixedly connected or articulated.

12. A leg rest arrangement as claimed in claim 1, wherein the position between the first and/or second support bar and the base is adjustable along the length of the side of the base.

13. The leg rest device of claim 12, further comprising a second slider and a locking mechanism, wherein the base is provided with a second slide rail, the first support rod assembly and/or the second support rod assembly is slidably connected to the second slide rail through the second slider, and the locking mechanism is connected to the second slider and the base, respectively, and is configured to lock the second slider.