Reference frame anti-rotation assembly for spine

Abstract

The utility model provides a reference frame anti-rotation assembly for a spine, which relates to the technical field of medical instruments and comprises a main body, at least two limiting holes arranged along a straight line are formed in the surface of the main body, and the limiting holes penetrate through the main body and are communicated with a movable cavity; the kirschner wire penetrates through the limiting hole; the movable block is provided with a limiting structure which drives the movable block to slide along the movable cavity. When the movable block slides in the movable cavity, one end face of the movable block gradually gets close to the limiting hole and tends to coincide with the limiting hole. When the movable block and the limiting hole partially coincide, the kirschner wire abuts against the movable block, and the problems that the spine is composed of a plurality of joints, the joints can move mutually, the arrangement stability of the reference frame is affected, errors are generated, and meanwhile when a navigation system is used for the spine, the reference frame needs to be placed over the spine of a person, and the operation is inconvenient are solved. Due to the fact that the distance between the multiple joints of the spine is small, the operation area is easily shielded by arranging a reference frame, and the operation view field is affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, especially a reference frame anti -rotation subassembly for spine. BACKGROUND

[0002] Orthopedic surgery usually obtains the image of the patient's affected area before or during the operation, and realizes image-guided surgery after intraoperative registration; the commonly used image-guided mode currently includes two-dimensional perspective guidance, CT guidance, etc.

[0003] Orthopedic surgery navigation tracks patient displacement or bone structure changes through a reference frame, usually firmly fixing the navigation reference frame on the surgical bone structure to reflect the position information of the surgical structure in time, and the navigation system realizes the guidance of the surgical operation.

[0004] However, for spine surgery, since the spine is composed of multiple bone segments, the bone segments can move relative to each other, affecting the stability of the reference frame setting and causing errors, and at the same time, when the navigation system is used for the spine, the reference frame needs to be placed directly above the human spine, and because the distance between the multiple bone segments of the spine is small, the setting of the reference frame can easily block the surgical area and affect the surgical field of view. SUMMARY

[0005] The utility model provides a reference frame anti -rotation subassembly for spine, specifically includes: the main part with movable cavity, the main part surface is equipped with at least two limit holes along linear arrangement, and limit hole penetrates main part and communicates with movable cavity, the main part is connected with reference frame on any end face of limit hole penetration, kirschner wire, at least two kirschner wire passes through the limit hole, movable block, the movable block has limit structure, the limit structure drives movable block and slides along movable cavity, and make movable block can be fixed position in movable cavity, when the movable block slides in movable cavity, one end surface of movable block gradually approaches limit hole, and has the tendency of coinciding with limit hole, when the movable block and limit hole part coincide, the kirschner wire is abutted.

[0006] As preferred, the limit structure is a knob; the main body is internally provided with a threaded hole; one end of the knob is a handle, and the other end is a threaded segment; the threaded segment is inserted into the threaded hole of the main body; the knob is rotatably connected with the movable block.

[0007] As preferred, the movable block is internally provided with a T-shaped connecting groove, and the end of the knob in contact with the movable block is provided with a T-shaped protrusion; the protrusion of the knob is inserted into the connecting groove of the movable block.

[0008] As preferred, the threaded hole of the main body has an included angle with the linear arrangement direction of the limit hole.

[0009] As preferred, the included angle is 90 degrees.

[0010] As preferred, the movable block is provided with linearly arranged limiting grooves on the end face facing the limiting hole; the limiting grooves are equal in radius to the limiting hole and one-to-one corresponding.

[0011] As preferred, the main body is provided with a connecting rod on any end face penetrated by the limiting hole, and the plane where the axis of the connecting rod is located has an included angle with any end face of the main body penetrated by the limiting hole; the main body is connected with the reference frame through the connecting rod.

[0012] As preferred, the connecting rod is provided with a limiting post transversely penetrating the connecting rod at the end away from the main body, and a threaded hole is formed in the interior of the end of the connecting rod away from the main body; the reference frame has a connecting end, the interior of the connecting end of the reference frame is provided with a screw rod, and the end face of the connecting end is provided with circumferentially arranged anti-skid grooves; the screw rod of the reference frame is inserted into the threaded hole of the connecting rod, and the limiting post is fitted with the anti-skid grooves of the connecting end.

[0013] Beneficial effects

[0014] In the utility model, one end of the two Kirschner wires is inserted into the patient's spine, and the other end of the Kirschner wire is inserted into the limiting hole, the movable block is driven to be close to the limiting hole through the limiting structure, the movable block is extruded to the Kirschner wire, the Kirschner wire is limited, at the same time, at least two Kirschner wires are fixed on the spine, can effectively prevent the reference frame installed on the assembly from rotating when external force, the linearly arranged limiting hole arranged according to the shape of the spine can select the appropriate limiting hole according to the distance between each bone joint of the spine, so as to determine the position of the Kirschner wire, ensure the stability of the reference frame, increase the adaptability of the assembly, and further reduce the error.

[0015] At the same time, through the inclined connecting rod, the position of the reference frame and the main body is staggered, avoiding the reference frame from shielding the surgical area of the spine, and since the inclination and length of the connecting rod can be determined, the position information of the spine can be determined in the navigation system according to the position of the reference frame through coordinate conversion. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings of the embodiments will be briefly introduced below.

[0017] The drawings in the following description only relate to some embodiments of the utility model, and are not limited to the utility model.

[0018] In the drawings:

[0019] Figure 1 A perspective structural schematic view of the reference frame anti-rotation assembly according to the embodiments of the utility model is shown.

[0020] Figure 2 A perspective structural schematic view of the main body of the reference frame anti-rotation assembly according to the embodiment of the present application is shown.

[0021] Figure 3 A sectional view of the main body of the reference frame anti-rotation assembly according to the embodiment of the present application is shown.

[0022] Figure 4 An assembly view of the reference frame anti-rotation assembly according to the embodiment of the present application is shown.

[0023] Figure 5 An assembly view of the reference frame anti-rotation assembly and the reference frame according to the embodiment of the present application is shown.

[0024] List of main reference signs

[0025] 101, main body; 102, movable cavity; 103, limiting hole; 104, connecting rod; 105, limiting column;

[0026] 2, knob; 201, threaded section;

[0027] 3, movable block; 301, limiting groove; 302, connecting groove;

[0028] 4, Kirschner wire;

[0029] 5, reference frame. DETAILED DESCRIPTION

[0030] In order to make the purpose, scheme and advantages of the technical scheme of the present application more clear, the technical scheme of the embodiment of the present application will be described clearly and completely in the following with reference to the drawings of the specific embodiment of the present application.

[0031] Embodiment: please refer to Figures 1 to 5 :

[0032] The present application provides a reference frame anti-rotation assembly for a spine, comprising:

[0033] The body 101 has an active cavity 102, the surface of the body 101 is provided with at least two limiting holes 103 arranged in a straight line, and the limiting holes 103 penetrate the body 101 and communicate with the active cavity 102; the reference frame 5 is connected to any end surface of the body 101 penetrated by the limiting hole 103; the Kirschner wire 4, at least two Kirschner wires 4 pass through the limiting hole 103; the movable block 3, the movable block 3 has a limiting structure, the limiting structure drives the movable block 3 to slide along the active cavity 102, and the movable block 3 can be fixed in position in the active cavity 102; when the movable block 3 slides in the active cavity 102, one end surface of the movable block 3 gradually approaches the limiting hole 103, and has a tendency to coincide with the limiting hole 103; when the movable block 3 partially coincides with the limiting hole 103, the Kirschner wire 4 is abutted.

[0034] As shown in Figure 3 and Figure 4 , the limiting structure is a knob 2; the body 101 is internally provided with a threaded hole; one end of the knob 2 is a handle, and the other end is a threaded segment 201; the threaded segment 201 is inserted into the threaded hole inside the body 101; the knob 2 is rotationally connected with the movable block 3; when the knob 2 is rotated, the knob 2 gradually inserts into or leaves the active cavity 102 along the axial direction, simultaneously driving the movable block 3 to slide in the same direction, and at the same time, since the connection is made by using threads, the knob 2 and the body 101 can be self-locked, so as to fix the position of the movable block 3 in the active cavity 102.

[0035] As preferred, as shown in Figure 3 and Figure 4 , the inside of the movable block 3 is provided with a T-shaped connecting groove 302, and the end of the knob 2 in contact with the movable block 3 is provided with a protrusion with a T-shaped cross section; the protrusion of the knob 2 is inserted into the connecting groove 302 of the movable block 3; in this embodiment, an implementation mode of rotationally connecting the movable block 3 and the knob 2 is provided.

[0036] As shown in Figure 2 and Figure 4 , the axis direction of the threaded hole of the body 101 has an included angle with the linear arrangement direction of the limiting hole 103; the included angle between the axis direction of the threaded hole and the linear arrangement direction of the limiting hole 103 ranges from 0 to 180 degrees, so as to realize that the knob 2 can drive the movable block 3 to approach the limiting hole 103.

[0037] As preferred, as shown in Figure 4 , the included angle is 90 degrees; 90 degrees is the preferred scheme of the above-mentioned included angle, which can make the movable block 3 approach the limiting hole 103 at the shortest distance, and at the same time, when the movable block 3 contacts the Kirschner wire 4, the most stable limiting support is provided.

[0038] As shown in Figure 3 and Figure 4As shown in the drawings, the end face of the movable block 3 towards the limiting hole 103 is provided with a linearly arranged limiting groove 301; the limiting groove 301 has the same radius as the limiting hole 103 and is one-to-one corresponding; the limiting groove 301 increases the contact area between the movable block 3 and the Kirschner wire 4, thereby ensuring the stability of the limiting of the Kirschner wire 4.

[0039] As shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, the main body 101 is provided with a connecting rod 104 on any end face penetrated by the limiting hole 103, and the plane where the central axis of the connecting rod 104 is located has an included angle with any end face of the main body 101 penetrated by the limiting hole 103; the main body 101 is connected with the reference frame 5 through the connecting rod 104; the position of the reference frame 5 and the main body 101 is staggered through the inclined connecting rod 104, thereby avoiding the reference frame 5 from shielding the surgical area of the spine, and since the inclination and length of the connecting rod 104 can be determined, the position information of the spine can be determined in the navigation system according to the position of the reference frame 5 through coordinate conversion.

[0040] As shown in the drawings, Figure 5 As shown in the drawings, the end of the connecting rod 104 away from the main body 101 is provided with a limiting column 105 transversely penetrating the connecting rod 104, and the end of the connecting rod 104 away from the main body 101 is internally provided with a threaded hole; the reference frame 5 has a connecting end, and the connecting end is internally provided with a screw rod, and the end face of the connecting end is provided with a circumferentially arranged anti-skid groove; the screw rod of the reference frame 5 is inserted into the threaded hole of the connecting rod 104, and the limiting column 105 is matched with the anti-skid groove of the connecting end; the matching of the anti-skid groove and the limiting column 105 ensures that the reference frame 5 will not rotate along the axial direction of the connecting rod 104 when the reference frame 5 is connected to the connecting rod 104, thereby ensuring the stability of the reference frame 5.

[0041] The specific use and effect of the embodiment are as follows: in the embodiment, one end of the two Kirschner wires 4 is inserted into the spine of a patient, and the other end of the Kirschner wire 4 is inserted into the limiting hole 103; the movable block 3 is driven by the limiting structure to move close to the limiting hole 103, so that the movable block 3 extrudes and limits the Kirschner wire 4; at the same time, the at least two Kirschner wires 4 are fixed on the spine, which can effectively prevent the reference frame 5 mounted on the assembly from rotating under external force; the linearly arranged limiting holes 103 arranged according to the shape of the spine can select appropriate limiting holes 103 according to the distance between each bone joint of the spine, so as to determine the position of the Kirschner wire 4, thereby ensuring the stability of the reference frame 5, increasing the adaptability of the assembly, and further reducing errors; at the same time, the position of the reference frame 5 and the main body 101 is staggered through the inclined connecting rod 104, thereby avoiding the reference frame 5 from shielding the surgical area of the spine; since the inclination and length of the connecting rod 104 can be determined, the position information of the spine can be determined in the navigation system according to the position of the reference frame 5 through coordinate conversion.

[0042] The above merely describes exemplary embodiments of the present application, and is not intended to limit the protection scope of the present application. The protection scope of the present application is defined by the appended claims.

Claims

1. A reference frame anti-rotation assembly for a spinal column, comprising: The utility model relates to a kind of reference frame, including: Main body (101) with movable cavity (102), the main body (101) is provided with at least two limiting holes (103) arranged in a straight line on surface, and limiting hole (103) penetrates main body (101) and is communicated with movable cavity (102);Any end surface of the main body (101) penetrated by limiting hole (103) is connected with reference frame (5); Kirschner wire (4), at least two the Kirschner wire (4) passes through the limiting hole (103); Movable block (3), the movable block (3) has limiting structure, the limiting structure drives movable block (3) to slide along movable cavity (102), and the movable block (3) can be fixed position in movable cavity (102); When the movable block (3) slides in movable cavity (102), one end surface of the movable block (3) gradually approaches limiting hole (103), and there is tendency to coincide with limiting hole (103);When the movable block (3) and limiting hole (103) partially coincide, Kirschner wire (4) is abutted.

2. A reference frame anti-rotation assembly for a spinal column according to claim 1, wherein, The limiting structure is knob (2);The main body (101) is provided with threaded hole inside;One end of the knob (2) is handle, and the other end is threaded section (201);The threaded section (201) is inserted in the threaded hole inside the main body (101);The knob (2) is rotatably connected with movable block (3).

3. A reference frame anti-rotation assembly for a spinal column according to claim 2, wherein, The inside of the movable block (3) is provided with T-shaped connecting groove (302), and one end of the knob (2) in contact with the movable block (3) is provided with T-shaped convex part;The convex part of the knob (2) is inserted in the connecting groove (302) inside the movable block (3).

4. A reference frame anti-rotation assembly for a spinal column according to Claim 2 wherein, The axis direction of the threaded hole of the main body (101) and the linear arrangement direction of the limiting hole (103) have included angle.

5. A reference frame anti-rotation assembly for a spinal column according to claim 4, wherein, The included angle is 90 degrees.

6. A reference frame anti-rotation assembly for a spinal column according to Claim 1 wherein, The end surface of the movable block (3) towards limiting hole (103) is provided with linearly arranged limiting slot (301);The limiting slot (301) and limiting hole (103) have equal radius and one-to-one correspondence.

7. A reference frame anti-rotation assembly for a spinal column according to Claim 1 wherein, Any end surface of the main body (101) penetrated by limiting hole (103) is provided with connecting rod (104), and the plane where the central axis of the connecting rod (104) is located has included angle with any end surface of the main body (101) penetrated by limiting hole (103);The main body (101) is connected with reference frame (5) by connecting rod (104).

8. A reference frame anti-rotation assembly for a spinal column according to claim 7, wherein, One end of the connecting rod (104) away from the main body (101) is provided with limiting column (105) transversely penetrating the connecting rod (104), and the inside of one end of the connecting rod (104) away from the main body (101) is provided with threaded hole;The reference frame (5) has connecting end, the inside of the connecting end of the reference frame (5) is provided with screw rod, and the end surface of the connecting end is provided with circumferentially arranged anti-skid groove;The screw rod of the reference frame (5) is inserted in the threaded hole inside the connecting rod (104), and the limiting column (105) is consistent with the anti-skid groove of the connecting end.

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