An anti-rotation assembly for an orthopedic surgical reference frame

Abstract

The present invention provides an anti-rotation component for an orthopedic surgical reference frame, which relates to the technical field of medical devices and comprises: a main body having an active chamber inside, and a locking member movable in the active chamber; the locking member has at least two contact surfaces, and the locking member has an initial state and a locked state relative to the main body; the main body is provided with at least two limiting holes penetrating the active chamber, and the limiting holes have at least two non-parallel inner walls; a traction structure connected to the locking member, the traction structure drives the locking member to move linearly, so that the locking member reaches the locked state from the initial state, and during the movement, the clamping space formed by the contact surface and the inner wall of the limiting hole becomes smaller; the traction structure fixes the locking member at any position in the active chamber, thereby solving the problem that long bone surgery involves various knocking and drilling actions, and the above-mentioned violent vibrations will cause the reference frame inserted into the bone to rotate relative to the bone, thereby causing a large error in the entire navigation system; and the existing technology is not suitable for thinner bones.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an anti-rotation component for an orthopedic surgery reference frame. Background Art

[0002] Orthopedic surgery usually obtains images of the patient's affected area before or during surgery, and then performs image-guided surgery after intraoperative registration. Currently, commonly used image-guided modes include two-dimensional fluoroscopic guidance, CT guidance, etc.

[0003] Orthopedic surgical navigation uses a reference frame to track patient displacement or bone structure changes. The navigation reference frame is usually firmly fixed on the surgical bone structure to timely reflect the position information of the surgical structure, and the navigation system guides the surgical operation.

[0004] Currently, surgical reference frames are mostly set to the surgical bone position by clamping, inserting or screwing into the bone to complete the tracking of the patient's body position and movement; however, because long bone surgery involves various knocking and drilling actions, the above-mentioned violent vibrations will cause the reference frame inserted into the bone to rotate relative to the bone, thereby causing a large error in the entire navigation system; and the existing technology often uses angle screws to solve the anti-rotation operation of surgical bones with uniform and large bones, but for some thinner bones, the angle screw method is not applicable. Summary of the invention

[0005] The present invention provides an anti-rotation assembly for an orthopedic surgery reference frame, specifically comprising:

[0006] A main body with an active chamber inside, and a locking piece that moves in the active chamber; the locking piece has at least two contact surfaces, and the locking piece has an initial state and a locked state relative to the main body; the main body is provided with at least two limiting holes that penetrate the active chamber, and the limiting holes have at least two non-parallel inner walls; a traction structure connected to the locking piece, the traction structure drives the locking piece to move linearly, so that the locking piece reaches the locked state from the initial state, and during the movement, the clamping space formed by the contact surface of the locking piece and the inner wall of the limiting hole becomes smaller; the traction structure fixes the locking piece at any position in the active chamber.

[0007] Preferably, the inner wall of the limiting hole is at least one arc-shaped inner wall and two plane inner walls tangent to the arc-shaped inner wall, and the angle range between the plane inner wall and the contact surface of the locking member is 0-90°; the angle range between the at least two contact surfaces of the locking member is 0-90°, and the contact surface of the locking member is not parallel to the at least two plane inner walls of the limiting hole.

[0008] Preferably, a threaded hole is provided inside the locking piece, and the traction structure is a threaded rod; the threaded rod is inserted into the threaded hole of the locking piece; the main body is provided with a guide hole A that passes through the active chamber, and the penetration direction of the guide hole A is the same as the penetration direction of the limiting hole; the locking piece is provided with a guide column that is higher than the surface of the locking piece; the guide column is located inside the guide hole A; the main body is also provided with a guide hole B that passes through the active chamber, and the penetration direction of the guide hole B is perpendicular to the penetration direction of the limiting hole; the threaded rod passes through the guide hole B and the threaded hole of the locking piece in sequence; the diameter of the guide hole B is larger than the diameter of the threaded rod, and the inner diameter of the guide hole A is larger than the diameter of the guide column; a mounting hole passing through the guide hole B is provided inside the main body, and a limiting pin is inserted into the mounting hole; a middle section of the limiting pin is located inside the guide hole B; the diameter of a section of the threaded rod inserted into the guide hole B is smaller than a section of the threaded rod inserted into the threaded hole of the locking piece, and the section of the threaded rod inserted into the threaded hole of the locking piece will be blocked by the limiting pin.

[0009] Preferably, the main body is fixedly connected to a connecting rod, and the other end of the connecting rod is fixedly connected to a reference frame.

[0010] Preferably, the main body is fixedly connected with a connecting rod, and the other end of the connecting rod is provided with a fixing pin which radially penetrates the connecting rod, and the reference frame is provided with a connecting end, and the connecting end is provided with a locking screw; the end surface of the connecting end is provided with circumferentially arranged arc grooves; the connecting end and one end of the connecting rod are locked by a locking screw, and the fixing pin is stuck in the arc groove of the connecting end.

[0011] Beneficial Effects

[0012] In the present invention, a corresponding number of fixing pins that have been fixed on the bone are inserted into at least two limiting holes, and the reference frame is connected to the other end of the component to form a stable structure of double fixing pins-anti-rotation component-reference frame. When the bone is subjected to knocking and drilling, the two fixing pins constrain each other so that the reference frame will not rotate. At the same time, appropriately increasing the limiting pins can also effectively reduce the swing amplitude of the reference frame after being vibrated. In summary, the error caused by the displacement of the reference frame caused by vibration during the operation is effectively reduced. At the same time, the guide column in the guide hole A and the threaded rod in the guide hole B only limit the threaded rod The maximum range of movement of the locking piece as a whole in the active chamber enables the locking piece to have a higher degree of freedom in the active chamber. The movement from the initial state to the locked state is not a simple linear movement, so that the clamping space formed between the inner wall of each limiting hole and the contact surface of the corresponding locking piece is not completely the same. Therefore, when clamping, the position of the locking piece in the active chamber can be automatically adapted according to the position of the fixing nails that are mutually displaced with the center of the arc-shaped inner wall of the limiting hole as the reference, the fixing nails of different outer diameters, etc., so that medical staff can be more free when selecting fixing nails;

[0013] Furthermore, when performing orthopedic surgical navigation, this component can connect the reference frame to the patient's bones, which can effectively reduce the rotation of the reference frame relative to the bones caused by vibration, and effectively reduce the error of the navigation system caused by the position offset of the reference frame. At the same time, this component connects the bones through an appropriate amount of fixing pins, and is also suitable for thin bones. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0015] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0016] In the attached picture:

[0017] Figure 1 A three-dimensional structural schematic diagram of an anti-rotation assembly according to an embodiment of the present invention is shown.

[0018] Figure 2 An exploded view of an anti-rotation assembly according to an embodiment of the present invention is shown.

[0019] Figure 3 A front view of an anti-rotation assembly according to an embodiment of the present invention is shown.

[0020] Figure 4 A perspective cross-sectional schematic diagram of a main body of an anti-rotation assembly according to an embodiment of the present invention is shown.

[0021] Figure 5 A schematic diagram of the locking process of the anti-rotation assembly according to an embodiment of the present invention is shown.

[0022] Figure 6 A perspective cross-sectional schematic diagram of a locking member of an anti-rotation assembly according to an embodiment of the present invention is shown.

[0023] Figure 7 A cross-sectional view of the main body of an anti-rotation assembly according to an embodiment of the present invention is shown.

[0024] Figure 8 A schematic perspective cross-sectional view of the main body of the anti-rotation assembly according to an embodiment of the present invention is shown in another direction.

[0025] Fig. 9 An assembly diagram of an anti-rotation assembly and a reference frame according to an embodiment of the present invention is shown.

[0026] Fig.10 A schematic diagram of the connection between the anti-rotation assembly and the reference frame according to an embodiment of the present invention is shown.

[0027] List of main reference symbols

[0028] 1. Main body; 101. Guide hole A; 102. Limit hole; 103. Guide hole B; 104. Limit pin;

[0029] 2. Locking member; 201. Guide column;

[0030] 3. Threaded rod; 301. Handle;

[0031] 4. Fixing nails;

[0032] 5. Connecting rod; 501. Fixing pin;

[0033] 6. Reference stand. DETAILED DESCRIPTION

[0034] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention.

[0035] Example: Please refer to Figures 1 to 10 :

[0036] The present invention proposes an anti-rotation assembly for an orthopedic surgical reference frame, comprising:

[0037] A main body 1 having an active chamber inside, and a locking member 2 movable in the active chamber; the locking member 2 has at least two contact surfaces, and the locking member 2 has an initial state and a locked state relative to the main body 1; the main body 1 is provided with at least two limiting holes 102 penetrating the active chamber, and the limiting holes 102 have at least two non-parallel inner walls; Figure 1 and Figure 2As shown, a corresponding number of fixing nails 4 that have been fixed on the bone are inserted into at least two limiting holes 102, and the reference frame 6 is connected to the other end of this component to form a stable structure of double fixing nails 4-anti-rotation component-reference frame 6. When the bone is subjected to knocking and drilling, the two fixing nails 4 constrain each other so that the reference frame 6 will not rotate. At the same time, the appropriate increase of fixing nails 4 can also effectively reduce the swing amplitude of the reference frame 6 after being vibrated. In summary, the error caused by the displacement of the reference frame 6 caused by vibration during the operation is effectively reduced; a traction structure connected to the locking member 2, the traction structure drives the locking member 2 to move linearly, so that the locking member 2 reaches the locked state from the initial state. During the movement, the clamping space formed by the contact surface of the locking member 2 and the inner wall of the limiting hole 102 becomes smaller; the traction structure drives the locking member 2 to move, and when the fixing nail 4 is inserted into the limiting hole 102, the contact surface of the locking member 2 and the inner wall of the limiting hole 102 will be further approached when contacting the fixing nail 4 under the drive of the traction structure, so that the clamping space becomes smaller and the fixing nail 4 is clamped; the traction structure causes the locking member 2 to move linearly, so that the locking member 2 reaches the locked state from the initial state. During the movement, the clamping space formed by the contact surface of the locking member 2 and the inner wall of the limiting hole 102 becomes smaller; the traction structure drives the locking member 2 to move, and when the fixing nail 4 is inserted into the limiting hole 102, the contact surface of the locking member 2 and the inner wall of the limiting hole 102 will be closer to each other under the drive of the traction structure when contacting the fixing nail 4, so that the clamping space becomes smaller and the fixing nail 4 is clamped; the traction structure causes the locking member 2 to move linearly, so that the fixing nail 4 The traction structure not only needs to drive the locking member 2 to move, but also needs to fix the locking member 2 at any position in the active chamber, especially the position where the locking member 2 clamps the fixing nail 4 after the fixing nail 4 is inserted into the limiting hole 102; one embodiment of the locking method is that the locking member 2 has a tendency to move toward one side of the active chamber in the active chamber, and the traction structure restricts the movement of the locking member 2. When the traction structure releases the restriction on the locking member 2, the locking member 2 moves along the direction of its own movement trend. It is constrained by the inner wall of the limiting hole 102, the fixing nail 4 and its own movement tendency to achieve clamping of the fixing nail 4. Preferably, the locking member 2 is connected to the main body 1 in the movable chamber through an elastic structure, such as a spring. One embodiment of the locking method is that the traction structure has a pulling member and a locking member, and the locking member 2 is driven to move by the pulling member. After the locking member 2 reaches the position of the locked state, the displacement of the pulling member is limited by the locking member to achieve the fixation of the locking member 2. Preferably, the locking member can be made of parts such as keys, pins, and screws.

[0038] Among them, Figure 3As shown, the inner wall of the limiting hole 102 is at least one arc-shaped inner wall and two plane inner walls tangent to the arc-shaped inner wall, and the angle range between the plane inner wall and the contact surface of the locking piece 2 is 0-90°; there is an angle of 0-180° between the two plane inner walls, so that the aperture of the limiting hole 102 shows a trend of gradually shrinking along the movement direction of the locking piece 2 from the initial state to the locked state, so that the two inner walls with the angle can be conveniently adapted to the fixing nails 4 that are mutually displaced with the center of the arc-shaped inner wall of the limiting hole 102 as a reference, and can also be conveniently adapted to the fixing nails 4 with different outer diameters, so that medical staff can be more free when selecting the fixing nails 4, and the inner wall of the limiting hole 102 can coincide / be tangent to the fixing nail 4, and a stable triangular structure can be formed between the inner wall and the fixing nail 4, which cooperates with the contact surface of the locking piece 2 to form a stable clamp for the fixing nail 4, which is beneficial to improve the stability of the reference frame 6 and reduce errors.

[0039] Among them, Figure 3 and Figure 5 As shown, the angle between at least two contact surfaces of the locking member 2 is in the range of 0-90°, and the contact surface of the locking member 2 is not parallel to at least two planar inner walls of the limiting hole 102; there is an angle between any two interconnected contact surfaces of the locking member 2, and during the movement of the locking member 2 from the initial state to the locked state, the contact surface approaches the inner wall of the corresponding limiting hole 102, so that the clamping space between the two becomes smaller, and at the same time, a stable triangular support is formed between the contact surface and the planar inner walls of the two corresponding limiting holes 102, thereby firmly clamping the fixing nail 4.

[0040] Among them, Figure 6 As shown, a threaded hole is provided inside the locking piece 2, and the traction structure is a threaded rod 3; the threaded rod 3 is inserted into the threaded hole of the locking piece 2; in this embodiment, when the threaded rod 3 rotates, the locking piece 2 is linearly moved along the axial direction of the threaded rod 3 through the threaded cooperation with the locking piece 2, and the threaded cooperation also provides self-locking for the locking piece 2, and the locking piece 2 will only move when the threaded rod 3 rotates, thereby realizing the movement of the locking piece 2 in the active chamber and being fixed when reaching the locked state.

[0041] Among them, Figure 3 and Figure 5 As shown, the main body 1 is provided with a guide hole A101 which passes through the active chamber, and the penetration direction of the guide hole A101 is the same as the penetration direction of the limiting hole 102; a guide column 201 which is higher than the surface of the locking member 2 is provided in the locking member 2; the guide column 201 is located inside the guide hole A101; the position of the locking member 2 in the active chamber is guided and limited by the guide hole A101 and the guide column 201, so as to prevent the locking member 2 from falling out of the active chamber after the threaded rod 3 is completely separated from the locking member 2.

[0042] Among them, Figure 4 and Figure 6 As shown, the main body 1 is also provided with a guide hole B103 penetrating the active chamber, and the penetration direction of the guide hole B103 is perpendicular to the penetration direction of the limiting hole 102; the threaded rod 3 passes through the guide hole B103 and the threaded hole of the locking member 2 in sequence; the diameter of the guide hole B103 is larger than the diameter of the threaded rod 3, and the inner diameter of the guide hole A101 is larger than the diameter of the guide column 201; the guide column 201 in the guide hole A101 and the threaded rod 3 in the guide hole B103 only limit the maximum range of motion of the threaded rod 3 and the locking member 2 as a whole in the active chamber, so that the locking member 2 has a higher degree of freedom in the active chamber, from the initial state to The locking state is not a simple linear movement, so the clamping space formed between the inner wall of each limiting hole 102 and the contact surface of the corresponding locking piece 2 is not exactly the same. Therefore, when clamping, in conjunction with the inner wall of the limiting hole 102, the position of the locking piece 2 in the active chamber can be self-adapted according to the position of the fixing nails 4 that are mutually staggered with respect to the center of the arc-shaped inner wall of the limiting hole 102, the fixing nails 4 of different outer diameters, etc., so that medical staff can be more free when selecting the fixing nails 4; a handle for medical staff to operate can be provided on the threaded rod 3, which makes it easier to tighten the locking of the locking piece 2 on the fixing nail 4.

[0043] Among them, Figure 7 and Figure 8 As shown, a mounting hole passing through the guide hole B103 is opened inside the main body 1, and a limit pin 104 is inserted into the mounting hole; a middle section of the limit pin 104 is located inside the guide hole B103; the diameter of a section of the threaded rod 3 inserted into the guide hole B103 is smaller than that of a section of the threaded rod 3 inserted into the threaded hole of the locking piece 2, and the section of the threaded rod 3 inserted into the threaded hole of the locking piece 2 will be blocked by the limit pin 104, which can prevent the threaded rod 3 from being detached from the main body 1 after the threaded rod 3 is completely detached from the locking piece 2. The limiting of the locking piece 2 by the guide column 201 can ensure the stability of the parts assembly.

[0044] In one of the embodiments, the main body 1 is fixedly connected to a connecting rod 5, and the other end of the connecting rod 5 is fixedly connected to a reference frame 6; the component and the reference frame 6 are integrally formed to reduce unnecessary intermediate connections, which can effectively improve the stability between the component and the reference frame 6 and avoid vibration and rotation caused by the connection gap of the intermediate structure, which may cause errors in the reference frame 6.

[0045] In another embodiment, if Fig. 9 and Fig.10 As shown, the main body 1 is fixedly connected to a connecting rod 5 , and the other end of the connecting rod 5 is provided with a fixing pin 501 which radially penetrates the connecting rod 5 .

[0046] Among them, Fig. 9 and Fig.10As shown, the reference frame 6 is provided with a connecting end, and the connecting end is provided with a locking screw; the end face of the connecting end is provided with circumferentially arranged arc grooves; the connecting end and one end of the connecting rod 5 are locked by a locking screw, and a fixing pin 501 is inserted into the arc groove of the connecting end; the detachable connection between the reference frame 6 and the anti-rotation component makes the use of the equipment more convenient, and at the same time, through the locking between the fixing pin 501 and the arc groove of the reference frame 6, while realizing the detachable connection, rotation between the reference frame 6 and the anti-rotation component can also be avoided.

[0047] Specific usage and function of this embodiment: In the present invention, a corresponding number of fixing nails 4 that have been fixed on the bone are inserted into at least two limiting holes 102, and the reference frame 6 is connected to the other end of this component to form a stable structure of double fixing nails 4-anti-rotation component-reference frame 6. When the bone is subjected to knocking and drilling, the two fixing nails 4 constrain each other so that the reference frame 6 will not rotate. At the same time, appropriately increasing the fixing nails 4 can also effectively reduce the swing amplitude of the reference frame 6 after being vibrated. In summary, the error caused by the displacement of the reference frame 6 caused by vibration during the operation is effectively reduced. At the same time, the guide column 201 is in the guide hole A101 and the threaded rod 3 is in the guide hole B103. Only the maximum movable range of the threaded rod 3 and the locking piece 2 as a whole in the movable chamber is limited, so that the locking piece 2 has a higher degree of freedom in the movable chamber, and the movement from the initial state to the locked state is not a simple linear movement, so that the clamping space formed between the inner wall of each limiting hole 102 and the contact surface of the corresponding locking piece 2 is not exactly the same. Therefore, when clamping, in conjunction with the inner wall of the limiting hole 102, the position of the locking piece 2 in the movable chamber can be self-adapted according to the position of the fixing nails 4 that are mutually staggered with respect to the center of the arc-shaped inner wall of the limiting hole 102, the fixing nails 4 of different outer diameters, etc., so that medical staff can be more free when selecting the fixing nails 4.

[0048] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. An anti-rotation assembly for an orthopedic surgical reference frame, characterized in that: include: A main body (1) having an active chamber therein, and a locking member (2) movable in the active chamber; the locking member (2) having at least two contact surfaces, and the locking member (2) having an initial state and a locked state relative to the main body (1); The main body (1) is provided with at least two limiting holes (102) penetrating the active chamber, and the limiting holes (102) have at least two non-parallel inner walls; a corresponding number of fixing pins (4) fixed on the bone are inserted into the at least two limiting holes (102), and a reference frame (6) is connected to the other end of the component; a traction structure connected to the locking member (2), the traction structure driving the locking member (2) to move linearly, so that the locking member (2) reaches a locked state from an initial state, and during the movement, a clamping space formed by a contact surface of the locking member (2) and an inner wall of the limiting hole (102) becomes smaller; The traction structure enables the locking member (2) to be fixed at any position in the active chamber.

2. The anti-rotation assembly for an orthopedic surgical reference frame according to claim 1, characterized in that: The inner wall of the limiting hole (102) is at least one arc-shaped inner wall and two plane inner walls tangent to the arc-shaped inner wall, and the angle between the plane inner wall and the contact surface of the locking member (2) is in the range of 0-90°.

3. The anti-rotation assembly for an orthopedic surgical reference frame according to claim 2, characterized in that: The angle between at least two contact surfaces of the locking member (2) is in the range of 0-90°, and the contact surface of the locking member (2) is not parallel to at least two planar inner walls of the limiting hole (102).

4. The anti-rotation assembly for an orthopedic surgical reference frame according to claim 1, characterized in that: A threaded hole is provided inside the locking piece (2), and the traction structure is a threaded rod (3); the threaded rod (3) is inserted into the threaded hole of the locking piece (2).

5. The anti-rotation assembly for an orthopedic surgical reference frame according to claim 4, characterized in that: The main body (1) is provided with a guide hole A (101) penetrating the active chamber, and the penetration direction of the guide hole A (101) is the same as the penetration direction of the limiting hole (102); the locking member (2) is provided with a guide column (201) higher than the surface of the locking member (2); the guide column (201) is located inside the guide hole A (101).

6. The anti-rotation assembly for an orthopedic surgical reference frame according to claim 5, characterized in that: The main body (1) is further provided with a guide hole B (103) penetrating the movable chamber, and the penetrating direction of the guide hole B (103) is perpendicular to the penetrating direction of the limiting hole (102); the threaded rod (3) passes through the guide hole B (103) and the threaded hole of the locking member (2) in sequence; the diameter of the guide hole B (103) is greater than the diameter of the threaded rod (3), and the inner diameter of the guide hole A (101) is greater than the diameter of the guide column (201).

7. The anti-rotation assembly for an orthopedic surgical reference frame according to claim 6, characterized in that: The main body (1) is provided with a mounting hole passing through the guide hole B (103), and a limit pin (104) is inserted into the mounting hole; a middle section of the limit pin (104) is located inside the guide hole B (103); the diameter of the section of the threaded rod (3) inserted into the guide hole B (103) is smaller than the diameter of the section of the threaded rod (3) inserted into the threaded hole of the locking member (2), and the section of the threaded rod (3) inserted into the threaded hole of the locking member (2) will be blocked by the limit pin (104).

8. The anti-rotation assembly for an orthopedic surgical reference frame according to claim 1, characterized in that: The main body (1) is fixedly connected to a connecting rod (5), and the other end of the connecting rod (5) is fixedly connected to a reference frame (6).

9. The anti-rotation assembly for an orthopedic surgical reference frame according to claim 1, characterized in that: The main body (1) is fixedly connected to a connecting rod (5), and the other end of the connecting rod (5) is provided with a fixing pin (501) radially penetrating the connecting rod (5); the reference frame (6) is provided with a connecting end, and the connecting end is provided with a locking screw; the end surface of the connecting end is provided with arc grooves arranged in a circumferential manner; the connecting end and one end of the connecting rod (5) are locked by a locking screw, and the fixing pin (501) is clamped in the arc groove of the connecting end.

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