Medical high-precision torsion joint

Abstract

The utility model discloses a medical high-precision torsion joint, which relates to the field of medical treatment and comprises a bayonet shaft sleeve and a gear shaft, and a torque limiting component is arranged between the bayonet shaft sleeve and the gear shaft. The torque limiting assembly comprises a spring pin and an annular elastic piece, a transverse groove is formed in the bayonet shaft sleeve, an arc-shaped groove is formed in the gear shaft, the spring pin is located in the arc-shaped groove and the transverse groove at the same time, and the spring pin is sleeved with the annular elastic piece. When the bone nail is fastened to a certain degree, larger torque is needed to drive the bone nail to continue to rotate and fasten, at the moment, an arc-shaped groove in the gear shaft exerts force on a spring pin to push the spring pin to move in the direction away from the central axis of the gear shaft, at the moment, the spring pin exerts force outwards from the inner side of an annular elastic piece, and an inner side elastic structure expands outwards; the gear shaft and the spring pin rotate relatively, the interior of the torsion connector idles, and the torque limiting effect is achieved.

Description

Technical Field

[0001] The utility model relates to the medical field, in particular to a medical high-precision torque joint. Background Art

[0002] As is known, orthopedic surgery is a surgery used to treat diseases and injuries of the skeletal system. Common orthopedic surgeries include fracture fixation surgery, joint replacement surgery, ligament reconstruction surgery, spinal surgery, etc. During some surgeries, a handle is used to tighten the implanted bone screws to lock the prosthesis in the body.

[0003] For example, the Chinese patent document with authorization announcement number CN218684863U, announcement date 2023-03-24, and name "A Medical Torque Handle" includes a fixed component, a rotatable component, an adjustment component and a quick-change joint component, the fixed component includes a clutch fixed block, a handle cover, a core shell and a tail cap, the two ends of the inner hole of the core shell are threadedly connected to the handle cover and the tail cap, and the clutch fixed block is circumferentially limited and connected to the tail cap; the rotatable component includes a core rod, a compression spring, a compression spring retaining ring, a clutch movable block and a first pin, the inner end of the core rod passes through the handle cover and the clutch fixed block; the inner end of the core rod is pinned to the clutch movable block, and a ball for transmitting torque is arranged between the clutch movable block and the clutch fixed block; the inner end of the clutch movable block compresses the compression spring and the compression spring retaining ring; the adjustment component includes a rolling frame, an adjusting nut and a locking nut, the inner hole of the core shell is provided with an adjusting nut and a locking nut and pushes the rolling frame; the quick-change joint assembly is arranged at the outer end of the core rod. The medical torque handle of the utility model has a large torque adjustment range, is not prone to deviation, and has high precision.

[0004] The disadvantages of the above-mentioned prior art are that when tightening the bone screw, if too little force is used, the bone screw will be easily loosened, and if too much force is used, the part to be fixed will be damaged. Utility Model Content

[0005] The purpose of the utility model is to provide a medical high-precision torque joint to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A medical high-precision torque joint comprises a bayonet sleeve and a gear shaft, wherein a torque limiting component is arranged between the bayonet sleeve and the gear shaft;

[0008] The torque limiting assembly includes a spring pin and an annular elastic member. A transverse groove is provided on the bayonet sleeve, an arc groove is provided on the gear shaft, the spring pin is located in both the arc groove and the transverse groove, and the annular elastic member is sleeved on the outside of the spring pin.

[0009] In the above-mentioned medical high-precision torque joint, the spring pin, the arc-shaped groove and the transverse groove are all provided in plurality.

[0010] In the above-mentioned medical high-precision torque joint, a plurality of avoidance grooves are provided inside the annular elastic member.

[0011] In the above-mentioned medical high-precision torque joint, the number of the annular elastic member is not less than one.

[0012] In the above-mentioned medical high-precision torque joint, a plurality of protrusions are arranged on the inner wall of the annular elastic member, a plurality of limiting grooves matching the protrusions are opened on the outer peripheral surface of the bayonet sleeve, and the plurality of protrusions and the plurality of limiting grooves are arranged in one-to-one correspondence.

[0013] In the above-mentioned medical high-precision torque joint, a shell is threadedly connected to the bayonet sleeve.

[0014] The above-mentioned medical high-precision torque joint has a sealing ring arranged inside the shell.

[0015] In the above-mentioned medical high-precision torque joint, a connecting piece is arranged on the gear shaft.

[0016] The above-mentioned medical high-precision torque joint, the connecting part includes a steel ball, the gear shaft is threadedly connected with a tool bayonet, the tool bayonet is provided with a movable groove, and the steel ball is movably arranged in the movable groove.

[0017] In the above-mentioned medical high-precision torque joint, a retaining ring is arranged on the tool bayonet, a locking sleeve is arranged on the outer sleeve of the retaining ring, an annular abutment portion is arranged on the inner wall of the locking sleeve, and a bayonet spring is arranged between the locking sleeve and the tool bayonet.

[0018] In the above technical scheme, the utility model provides a medical high-precision torque joint, which is provided with an annular elastic part and a spring pin. The annular elastic part is sleeved on the outside of the spring pin. When the bone screw is tightened to a certain degree, a larger torque is required to drive it to continue to rotate and tighten. At this time, the arc groove on the gear shaft will apply force to the spring pin to push the spring pin to move in a direction away from the central axis of the gear shaft. At this time, the spring pin applies force from the inside of the annular elastic part to the outside, so that the inner elastic structure expands outward, the gear shaft and the spring pin rotate relative to each other, and the torque joint idles inside, thereby achieving a torque limiting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of an explosion structure provided for an embodiment of the utility model;

[0021] Figure 2 A front view structural schematic diagram provided for an embodiment of the utility model;

[0022] Figure 3 for Figure 2 The cross-sectional view at aa in the middle;

[0023] Figure 4 A front view structural schematic diagram provided for an embodiment of the utility model;

[0024] Figure 5 for Figure 4 Schematic diagram of the cross section at bb in the middle;

[0025] Figure 6 An overall schematic diagram of an annular elastic member provided in an embodiment of the utility model;

[0026] Figure 7 This is a front view schematic diagram of an annular elastic member provided in an embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 1. Bayonet sleeve; 2. Gear shaft; 3. Spring pin; 4. Annular elastic member; 5. Horizontal groove; 6. Arc groove; 7. Protrusion; 8. Limit groove; 9. Shell; 10. Tool bayonet; 11. Movable groove; 12. Steel ball; 13. Retaining ring; 14. Locking sleeve; 15. Bayonet spring; 16. Gasket; 17. Avoidance groove. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] In the description of the present utility model, it is necessary to understand that Figure 1The position of the middle bayonet sleeve 1 relative to the gear shaft 2 is on the left, and vice versa. The terms "center", "lateral", "length", "left", "right", "inside", "outside", "axial", "radial", "circumferential", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] Reference Figure 1-7 A medical high-precision torque joint provided by an embodiment of the utility model includes a bayonet sleeve 1 and a gear shaft 2, a torque limiting component is arranged between the bayonet sleeve 1 and the gear shaft 2; the torque limiting component includes a spring pin 3 and an annular elastic member 4, a transverse groove 5 is provided on the bayonet sleeve 1, an arc groove 6 is provided on the gear shaft 2, the spring pin 3 is located in both the arc groove 6 and the transverse groove 5, and the annular elastic member 4 is sleeved on the outside of the spring pin 3.

[0032] Specifically, during orthopedic surgery, it is necessary to lock the frame in the human body through bone screws, set the bone screws in the position to be tightened, and tighten the bone screws through force-applying components such as screwdrivers to achieve fixation of the prosthesis. This is a prior art and will not be repeated. One of the core innovations of the embodiment of the utility model is that a bayonet sleeve 1 and a gear shaft 2 are provided, and a torque limiting component is provided between the bayonet sleeve 1 and the gear shaft 2. The bayonet sleeve 1 includes a plug-in portion located at the left end and a connecting portion located at the right end, and the connecting portion is a cylindrical structure, the spring pin 3 is an internally hollow round rod structure, the transverse groove 5 is arranged along the length direction of the connecting portion, and the size of the transverse groove 5 is consistent with the size of the spring pin 3. The arc groove 6 is arranged on the outer peripheral surface of the gear shaft 2, and the spring pin 3 is located in the arc groove 6 and the transverse groove 5 at the same time. The annular elastic member 4 can be an annular spring-shaped structure, which can be extended and retracted in the radial direction. The effect of such a setting is that when the bone screw is tightened to a certain extent, a larger torque is required to drive the continued rotation and tightening. At this time, the arc groove 6 on the gear shaft 2 will apply force to the spring pin 3 to push the spring pin 3 to move in the direction away from the central axis of the gear shaft 2. At this time, the spring pin 3 applies force from the inside of the annular elastic member 4 to the outside, so that the annular elastic member 4 expands outward, the gear shaft 2 and the spring pin 3 rotate relative to each other, and the torque joint idles inside, thereby achieving the effect of torque limitation.

[0033] Preferably, the spring pin 3, the arc groove 6 and the transverse groove 5 are provided in plurality, and the transverse groove 5 and the spring pin 3 are preferably six, the plurality of arc grooves 6 are arranged in an array on the outer circumferential surface of the gear shaft 2, the six transverse grooves 5 are arranged in an array on the outer circumferential surface of the gear shaft 2, and the six spring pins 3 and the six transverse grooves 5 are arranged in one-to-one correspondence, so that the annular elastic member 4 can expand synchronously from multiple positions.

[0034] As a preferred embodiment of the present utility model, Figure 6-7 As shown, a plurality of avoidance grooves 17 are provided inside the annular elastic member 4, and the annular elastic member 4 is made of elastic material. The avoidance grooves 17 make the annular elastic member 4 have a hollow area. When the inner wall of the annular elastic member 4 is subjected to force, it will avoid into the avoidance grooves 17 to achieve the expansion of the internal space of the annular elastic member 4.

[0035] Furthermore, the number of the annular elastic member 4 is not less than one, that is, the number of the annular elastic member 4 can be adjusted. When different torque limits are required, it can be achieved by adjusting the number of the annular elastic members 4, which is convenient and quick.

[0036] Furthermore, a plurality of protrusions 7 are provided on the inner wall of the annular elastic member 4, and a plurality of limiting grooves 8 matched with the protrusions 7 are opened on the outer peripheral surface of the bayonet sleeve 1. The plurality of protrusions 7 and the plurality of limiting grooves 8 are arranged in one-to-one correspondence. Specifically, the limiting grooves 8 and the transverse grooves 5 are arranged alternately, and the plurality of limiting grooves 8 are arranged along the length direction of the connecting part, so that the relative rotation between the annular elastic member 4 and the bayonet sleeve 1 can be limited.

[0037] Furthermore, a shell 9 is threadedly connected to the bayonet sleeve 1. The shell 9 is a cylindrical structure and is sleeved on the outside of the connecting part, the spring pin 3, the annular elastic member 4 and other components to prevent them from being dirty.

[0038] Furthermore, a sealing ring is provided in the housing 9 , and the sealing ring is provided at the connection position between the housing 9 and the gear shaft 2 , so that the sealing performance of the housing 9 can be improved.

[0039] Furthermore, a connecting piece is provided on the gear shaft 2, and the connecting piece is a connecting structure such as a bolt, which is used to connect a screwdriver (not shown in the figure, which is similar to a screwdriver, etc., and the structure of its end is adapted to the shape of the tightening position of the bone screw) to the gear shaft 2 to facilitate the application of force.

[0040] Preferably, the connecting member includes a steel ball 12, and a tool mount 10 is threadedly connected to the gear shaft 2. A movable groove 11 is provided on the tool mount 10, and the steel ball 12 is movably arranged in the movable groove 11. Specifically, a groove-shaped connecting seat is provided at one end of the tool mount 10 away from the gear shaft 2, and the movable groove 11 is provided on the side wall of the connecting seat, and the size of the movable groove 11 is larger than the size of the steel ball 12, so that the steel ball 12 can roll in the movable groove 11. When fixing the screwdriver, the connector of the screwdriver is inserted into the connecting seat, and a force is applied to the steel ball 12 toward the central axis of the tool mount 10, so that the steel ball 12 can roll in the direction of the central axis of the tool mount 10, and when the steel ball 12 abuts against the outer peripheral surface of the screwdriver connection position, the screwdriver can be fixed.

[0041] It should be noted that a limiting structure such as an annular groove can be provided at the connection position of the screwdriver to improve the stability during connection.

[0042] Furthermore, a retaining ring 13 is provided on the tool bayonet 10, a locking sleeve 14 is provided on the outer sleeve of the retaining ring 13, an annular abutment portion (not shown in the figure) is provided on the inner wall of the locking sleeve 14, and a bayonet spring 15 is provided between the locking sleeve 14 and the tool bayonet 10. Specifically, as shown in FIG. Figure 1 As shown, the retaining ring 13 is fixed to the outer peripheral surface of the tool bayonet 10, and the radial size of the annular abutment portion gradually decreases from left to right. An annular protrusion is arranged on the outer peripheral surface of the tool bayonet 10, one end of the bayonet spring 15 is fixed to the annular protrusion, and the other end is fixed to the locking sleeve 14. The purpose of such arrangement is that when fixing the screwdriver, the locking sleeve 14 will be pulled to the right, so that the annular abutment portion and the steel ball 12 are separated, and the bayonet spring 15 is charged. At this time, the steel ball 12 is in a free state, the connecting position of the screwdriver is inserted into the connecting seat, and the locking sleeve 14 is released. At this time, the elastic force of the bayonet spring 15 is released, so that the locking sleeve 14 and the annular abutment portion move to the left. When the annular abutment portion abuts against the steel ball 12, it will provide the steel ball 12 with a force in the direction of the central axis of the tool bayonet 10, so that the steel ball 12 can abut against the connecting part of the screwdriver to achieve rapid fixation of the screwdriver.

[0043] It should be noted that a gasket 16 is provided between the bayonet sleeve 1 and the gear shaft 2, and between the gear shaft 2 and the housing 9, and the gasket is made of peek plastic. In this way, the friction between metals is changed to the friction between metals and peek plastic, which can avoid the disadvantage of heat and wear caused by friction between metals.

[0044] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A medical high-precision torque joint, characterized in that: It comprises a bayonet sleeve and a gear shaft, wherein a torque limiting component is arranged between the bayonet sleeve and the gear shaft; The torque limiting assembly includes a spring pin and an annular elastic member. A transverse groove is provided on the bayonet sleeve, an arc groove is provided on the gear shaft, the spring pin is located in both the arc groove and the transverse groove, and the annular elastic member is sleeved on the outside of the spring pin.

2. A medical high-precision torque joint according to claim 1, characterized in that: The spring pin, the arc-shaped groove and the transverse groove are all provided in plurality.

3. A medical high-precision torque joint according to claim 1, characterized in that: A plurality of avoidance grooves are arranged inside the annular elastic member.

4. The medical high-precision torque joint according to claim 1, characterized in that: The number of the annular elastic member is not less than one.

5. The medical high-precision torque joint according to claim 1, characterized in that: A plurality of protrusions are arranged on the inner wall of the annular elastic member, a plurality of limiting grooves matching the protrusions are opened on the outer peripheral surface of the bayonet sleeve, and the plurality of protrusions and the plurality of limiting grooves are arranged in one-to-one correspondence.

6. A medical high-precision torque joint according to claim 1, characterized in that: The bayonet sleeve is threadedly connected with a housing.

7. A medical high-precision torque joint according to claim 6, characterized in that: A sealing ring is arranged in the shell.

8. The medical high-precision torque joint according to claim 1, characterized in that: A connecting piece is arranged on the gear shaft.

9. A medical high-precision torque joint according to claim 8, characterized in that: The connecting piece comprises a steel ball. A tool bayonet is threadedly connected to the gear shaft. A movable groove is provided on the tool bayonet. The steel ball is movably arranged in the movable groove.

10. A medical high-precision torque joint according to claim 9, characterized in that: The tool bayonet is provided with a retaining ring, a locking sleeve is provided on the outer cover of the retaining ring, an annular abutting portion is provided on the inner wall of the locking sleeve, and a bayonet spring is provided between the locking sleeve and the tool bayonet.

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