An intraoperative ligament tightness tester

Abstract

The present invention discloses an intraoperative ligament tightness tester, which includes a fixing component for supporting on the bone tissue of the ligament to be tested; a testing component arranged in the fixing component and moving relative to the fixing component; the testing component includes a connecting part for connecting the ligament and an elastic part connected to the connecting part; marking pieces are arranged at both ends of the elastic part; a tension component, one end of which is connected to the elastic part and the other end extends out of the fixing component; a displacement marking part is arranged on the fixing component; a preset force is applied to the other end of the tension component, and the ligament to be tested is pulled through the elastic part and the connecting part; wherein, when the elastic part is stretched and moved by the tension component, the elastic part stretches the ligament to be tested, and the tightness of the ligament to be tested is measured through the positions of the two marking pieces on the displacement marking part. The present invention realizes the testing of the tightness of the ligament.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an intraoperative ligament tightness tester. Background Art

[0002] Injury of the anterior cruciate ligament (ACL) of the knee joint is one of the most common knee joint sports injuries. According to incomplete statistics, a large number of cross ligament injury patients are generated in competitive sports every year. Of course, car accident injuries can also cause cross ligament injuries.

[0003] For the treatment of anterior cruciate ligament injury of the knee joint, according to the current medical level, using ligament substitutes to reconstruct the ACL to restore the stability and mobility of the knee joint is the most commonly used and most effective treatment method.

[0004] In terms of structure and mechanical function, the ACL is one of the most complex structures in the human body. The ACL, also known as the anterior cruciate ligament, is located inside the knee joint. It originates from the inner side of the lateral condyle of the femur, slopes obliquely forward and downward, and ends at the front part of the intercondylar eminence of the tibia and the anterior horns of the medial and lateral menisci, connecting the femur and the tibia. The attachment area of the ligament on the femoral side at the upper end is smaller than that on the tibial side at the lower end. Its fiber bundles are not arranged in parallel, but are distributed from the femoral side in a roughly oblique and radial manner to the tibial side. The posterior fiber bundle has an outer attachment point on the tibial side, and the anterior fiber bundle is more medial. Its main function is to limit the excessive forward displacement of the tibia. It acts together with other structures in the knee joint to maintain the stability of the knee joint, enabling the human body to complete various complex and difficult lower limb movements.

[0005] The repair of the anterior cruciate ligament in sports medicine can be to obtain ligaments from other places, such as ligaments obtained from the patient's own tendons, or artificial ligaments. During ligament repair, it is very important to test the tightness of the ligament, because when the ligament is too tight, it will cause pain; when the ligament is too loose, it cannot play the role of a ligament.

[0006] In addition, in joint degeneration, for example, in the case of joint degeneration in the elderly, it is necessary to first replace the original degenerated joint with an artificial metal joint. In the prior art, it is possible to only replace the joint and retain the original ligament. Compared with replacing the ligament, the original ligament is more stable, but it is also necessary to measure the tightness of the ligament in order to adjust it during joint surgery. Summary of the Invention

[0007] By providing an intraoperative ligament tightness tester in the embodiments of the present application, the problem in the prior art that the tightness of the ligament cannot be tested during ligament repair and joint replacement is solved, and the tightness of the ligament can be tested by the intraoperative ligament tightness tester.

[0008] An embodiment of the present application provides an intraoperative ligament tightness tester, including a fixing component for supporting on the bone tissue of the ligament to be tested;

[0009] A testing component is arranged in the fixing component and moves relative to the fixing component; the testing component includes a connecting part for connecting the ligament and an elastic part connected to the connecting part; marking pieces are arranged at both ends of the elastic part;

[0010] A tension component is connected to one end of the elastic part, and the other end extends out of the fixing component; a displacement marking part is arranged on the fixing component; a preset force is applied to the other end of the tension component, and the ligament to be tested is pulled through the elastic part and the connecting part;

[0011] Wherein, when the elastic part is stretched and moved by the tension component, the elastic part stretches the ligament to be tested, and the tightness of the ligament to be tested is measured by the positions of the two marking pieces on the displacement marking part.

[0012] Further, the fixing component includes a bracket structure and an outer cylinder structure;

[0013] The bracket structure is connected to the bone tissue;

[0014] The testing component and the tension component are arranged in the outer cylinder structure;

[0015] The bracket structure is sleeved on the outer surface of the outer cylinder structure, and the outer cylinder structure slides on the bracket structure to drive the connecting part to connect the ligament to be tested;

[0016] When the outer cylinder structure rotates relative to the bracket structure, the outer cylinder structure and the outer surface of the bracket structure are locked and fixed.

[0017] Further, the outer cylinder structure is a cylindrical cavity with one end open and one end through; the outer surface of the outer cylinder structure is connected to the bracket structure, and the outer cylinder structure sleeves the testing component and the tension component so that the testing component and the tension component can slide in the outer cylinder structure.

[0018] Further, the testing component further includes an inner cylinder structure, and the inner cylinder structure is a cylindrical cavity with one end open and one end sealed;

[0019] The inner cylinder structure sleeves the elastic part, wherein the sealed part of the inner surface is connected to one end of the elastic part, the other end of the elastic part is connected to the connecting part, and the connecting part extends out of the opening of the inner cylinder structure;

[0020] The sealed end of the outer surface of the inner cylinder structure is connected to the tension component.

[0021] Further, a slot hole is provided on the side wall of the outer cylinder structure, and the displacement marking portion is arranged on the outer surface of the side of the slot hole;

[0022] When the elastic portion or the inner cylinder structure slides within the inner cylinder structure, the marking member extends along the slot hole, so that the marking member moves along the displacement marking portion.

[0023] Further, the connecting portion adopts a hook structure.

[0024] Further, the elastic portion is a spring member predetermined according to the tensile force requirement of the ligament to be tested.

[0025] Further, a plurality of connecting members are provided on the bracket structure, and the bracket structure is fixed to the bone tissue through the connecting members.

[0026] An intraoperative ligament tightness tester provided in an embodiment of the present application has at least the following technical effects:

[0027] 1. Since the fixing component is adopted, when performing the ligament tightness test, the test component is first fixed by the fixing component, effectively solving the problem in the prior art that due to the non-fixation of the measuring tool and the bone tissue, relative displacement occurs during measurement, the measurement angle deviates, resulting in measurement errors or instability during measurement, and thus improving the stability of the measurement operation during the ligament tightness test.

[0028] 2. Since the tightness of the ligament to be tested is measured according to a predetermined tensile force, different tensile forces can be used according to different requirements. By using a spring with a predetermined tensile force requirement, the same instrument only needs to use springs with different tensile forces to meet different tensile force requirements, making the device simple in structure and convenient to operate.

[0029] 3. Through the marking members at both ends of the elastic portion, the displacement amount of the elastic portion and the ligament is obtained, and the deformation amount of the elastic portion is obtained. According to the deformation amount of the elastic portion, the test zipper is obtained. Through the total displacement amount of the elastic portion and the ligament and the elastic deformation amount, the displacement amount of the ligament is obtained, thereby realizing the test.

[0030] 4. Since the cylindrical design is adopted, it is convenient to operate and use during measurement. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of an intraoperative ligament tightness tester in an embodiment of the present application;

[0032] Figure 2 It is a schematic side structural diagram of an intraoperative ligament tightness tester in an embodiment of the present application;

[0033] Figure 3Schematic structural diagram of the outer cylinder structure in the embodiments of the present application;

[0034] Figure 4 Schematic cross-sectional structural diagram of a ligament tightness tester during surgery in the embodiments of the present application;

[0035] Figure 5 Schematic structural diagram of the bracket structure in the embodiments of the present application;

[0036] Figure 6 Schematic structural diagram of the fixing component in the embodiments of the present application

[0037] Figure 7 Cross-sectional view of the test component in the embodiments of the present application. Detailed implementation manners

[0038] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0039] Embodiment 1

[0040] Refer to the attached Figure 1-4 As shown, this embodiment provides a ligament tightness tester during surgery, including

[0041] A fixing component 100, which is used to be installed on the bone tissue of the ligament to be tested. Further, the test component is positioned through the fixing component 100 so as to measure the ligament to be tested.

[0042] A test component, which is arranged in the fixing component 100 and moves relative to the fixing component 100; the test component includes a connecting portion 210 for connecting the ligament, and an elastic portion 220 connected to the connecting portion 210. Marking pieces are arranged at both ends of the elastic portion. Further, the ligament to be tested is connected through the connecting portion 210, and the ligament to be tested is located between the bone tissues where the fixing component 100 is installed; the elastic portion 220 is used to connect the connecting portion 210 so as to give a fixed pulling force to the ligament to be tested, judge the tightness of the ligament, and thus know whether the ligament meets the expected requirements.

[0043] In one embodiment, according to the connection relationship between the bone tissue and the ligament, the connecting portion 210 adopts a hook structure, directly hooks the ligament to be tested through the hook structure, and stretches the ligament to be tested outward through the hook structure, so as to test the tightness of the ligament to be tested.

[0044] In one embodiment, the elastic portion 220 is a spring piece predetermined according to the pulling force requirement of the ligament to be tested.

[0045] A tensile component, one end of which is connected to the elastic part 220 and the other end extends out of the fixing component 100; a displacement marking part is provided on the fixing component 100; a preset force is applied to the other end of the tensile component, and the ligament to be tested is pulled through the elastic part 220 and the connecting part 210. In one embodiment, the tensile component includes a handle 320 and a connecting rod 310. The connecting rod 310 is connected to the elastic part 220 to apply a preset force to the elastic part 220, and the handle 320 is connected to the connecting rod 310 to apply a preset force to the connecting rod 310. Among them, the handle 320 extends out of the fixing component 100.

[0046] Among them, when the elastic part 220 is stretched and moved by the tensile component, the elastic part 220 stretches the ligament to be tested, and the tightness of the ligament to be tested is measured by the positions of the two marking parts on the displacement marking part.

[0047] That is, the deformation amount of the elastic part is obtained by the positions of the two marking parts on the displacement marking part. Using the formula: tensile force = elastic deformation amount * elastic coefficient, the measured tensile force value is obtained; the displacement amount of the ligament and the elastic part is obtained by the position of the marking part far from the ligament. According to the deformation amount of the elastic part, the displacement amount of the ligament is obtained, thus realizing the test.

[0048] In one embodiment, after the connecting part 210 is connected to the ligament, the length of the connecting part 210 is adjusted so that the fixing component 100 supports on the bone tissue, and then the tensile component is pulled. When the elastic part 220 just starts to be stretched, for example, the starting threshold tensile force is set to 5N, the marking part installed at the connection of the connecting part 210 and the elastic part 210 will point to a value S1 on the displacement marking part of the fixing component 100. Continue to apply the tensile force, the test component will move relative to the fixing component 100, and at the same time the elastic part 220 will also be stretched. When the tensile force reaches the termination threshold, at this time, the value of the displacement marking part pointed to by the marking part at the other end of the elastic part 220 is S2. During this measurement process, the fixing component 100 is stationary relative to the bone tissue, then the deformation amount of the elastic part 220 can be obtained as S2 - S1, where S2 is the stretching amount of the elastic part 220 and the stretching amount of the ligament.

[0049] If a tensile force of 10N needs to be applied to the ligament to be tested, therefore, for the tensile test of the ligament to be tested, only by using the tensile force formula of the elastic part 220: tensile force = elastic coefficient * (S2 - S1), the ligament to be tested can be tested to judge the tightness of the current ligament.

[0050] Embodiment Two

[0051] Refer to Appendix Figure 3 、 5As shown in FIG. -6, this embodiment provides an intraoperative ligament tightness tester, which includes a fixing component 100. The fixing component 100 includes a bracket structure 110 and an outer cylinder structure 120. The bracket structure 110 is connected to the bone tissue. The outer cylinder structure 120 is provided with a testing component and a tension component inside. The bracket structure 110 is sleeved on the outer surface of the outer cylinder structure 120. The outer cylinder structure 120 slides on the bracket structure 110, driving the connecting part 210 to connect the ligament to be tested. When the outer cylinder structure 120 rotates relative to the bracket structure 110, the outer surface of the outer cylinder structure 120 and the bracket structure 110 are locked and fixed.

[0052] In one embodiment, a limiting protrusion is provided on the inner surface of the bracket structure 110, and a limiting part is provided on the outer surface of the measuring outer cylinder. The outer cylinder structure 120 slides inside the bracket structure 110 and slides to the limiting protrusion. After rotating the outer cylinder structure 120, the limiting part of the outer cylinder structure 120 is clamped with the limiting protrusion of the bracket structure 110, so that the outer cylinder structure 120 and the bracket structure 110 are clamped and locked. Of course, the locking connection between the outer cylinder structure 120 and the bracket structure 110 is not limited to this. For example, the bracket structure 110 and the outer cylinder structure 120 are thread-locked, or the bracket structure 110 and the outer cylinder structure 120 are limited-locked, etc.

[0053] The bracket structure 110 in this example includes a cylindrical cavity with both ends open and a frustum cavity with both ends open. One end of the cylindrical cavity is integrally connected to the small end of the frustum cavity, and the other end of the cylindrical cavity is connected to the outer surface of the outer cylinder structure 120. The bone tissue is fixed through a hollow ring-shaped bracket, so as to improve the stability of the measurement.

[0054] In one embodiment, a plurality of connecting pieces are provided on the bracket structure 110, and the bracket structure 110 is fixed to the bone tissue through the connecting pieces. Further, the connecting pieces in this example can be screws. First, one end of a rope is fixed to the bracket structure 110, the other end is fixed to the screw, and then the screw is fixed to the bone tissue. In this embodiment, three screws can be used to fix the bracket structure 110 to the joint bone through triangular fixation. Of course, the method of fixing the bracket structure 110 to the joint bone is not limited to this.

[0055] Further, the outer cylinder structure 120 is a cylindrical cavity with one end open and one end through hole 122. The outer surface of the outer cylinder structure 120 is connected to the bracket structure 110. The outer cylinder structure 120 sleeves the testing component and the tension component, so that the testing component and the tension component slide inside the outer cylinder structure 120.

[0056] Embodiment III

[0057] Refer to the appendix Figure 4 、 7 As shown in FIG., this embodiment provides an intraoperative ligament tightness tester, which includes

[0058] The fixing assembly 100, the testing assembly, and the tension assembly, wherein the testing assembly is arranged in the fixing assembly 100 and moves relative to the fixing assembly 100; the testing assembly comprises a connecting portion 210 for connecting the ligament and an elastic portion 220 connected to the connecting portion 210. The elastic portion 220 is connected to the tension assembly, and when the elastic portion is stretched and moved by the tension assembly, the elastic portion stretches the ligament to be tested, and the tightness of the ligament to be tested is measured by the positions of the two marking members on the displacement marking portion.

[0059] The test assembly also includes an inner cylinder structure 230, which is a cylindrical cavity with one end open and the other end sealed; the inner cylinder structure 230 is sleeved with an elastic part 220; wherein, the sealing part of the inner surface of the inner cylinder structure 230 is connected to one end of the elastic part 220, the other end of the elastic part 220 is connected to the connecting part 210, and the connecting part 210 extends out of the opening of the inner cylinder structure 230, and the sealing end of the outer surface of the inner cylinder structure 230 is connected to the tension component.

[0060] Furthermore, a slot 121 is provided on the side wall of the outer cylinder structure 120, and a displacement marking portion is provided on the outer surface of the side edge of the slot 121; when the elastic portion 220 or the inner cylinder structure 230 slides in the outer cylinder structure 120, the marking member extends along the slot 121 so that the marking member moves along the displacement marking portion.

[0061] In one embodiment, the marking member may be a pointer, and the displacement marking portion may be a scale. When the elastic portion 220 slides in the outer tube structure 120, the pointer slides along the slot 121 to point to the scale, so as to implement ligament testing.

[0062] Embodiment 4

[0063] In combination with Embodiments 1 to 3, the steps of using the intraoperative ligament tightness tester of this embodiment may include the following:

[0064] (1) The operator predicts the tension required for the tested ligament and prepares the elastic part 220 corresponding to the tension;

[0065] (2) fixing the support structure 110 to the bone tissue;

[0066] (3) After the test assembly and the tension assembly are installed on the outer cylinder structure 120, it is inserted into the support structure 110 and then slid to drive the connecting portion 210 on the test assembly to connect to the tested ligament. After the connection is completed, the outer cylinder structure 120 is rotated and the outer cylinder structure 120 and the support structure 110 are locked and fixed;

[0067] (4) The elastic part 220 is stretched by the tension component, so as to drive the elastic part 220 to apply tension to the connecting part 210, thereby driving the connecting part 210 to apply tension to the tested ligament, and the tested ligament is tested by adjusting the positions of the two marking members on the displacement marking part.

[0068] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0069] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An intraoperative ligament tightness tester, characterized in that, Comprising: A fixing component for supporting on the bone tissue of the ligament to be tested; A testing component disposed within the fixing component and movable relative to the fixing component; the testing component includes a connecting portion for connecting the ligament and an elastic portion connected to the connecting portion; marking members are provided at both ends of the elastic portion; the connecting portion adopts a hook structure, and the elastic portion is a spring member predetermined according to the tensile force requirement of the ligament to be tested; A tensile force component, one end of which is connected to the elastic portion and the other end extends out of the fixing component; a displacement marking portion is provided on the fixing component; a preset force is applied to the other end of the tensile force component, and the ligament to be tested is pulled through the elastic portion and the connecting portion; Wherein, when the elastic portion is stretched and moved by the tensile force component, the elastic portion stretches the ligament to be tested, and the tightness of the ligament to be tested is measured by the positions of the two marking members on the displacement marking portion; the fixing component includes a bracket structure and an outer cylinder structure. The bracket structure is fixed to the bone tissue. After the outer cylinder structure installs the testing component and the tensile force component, it is inserted onto the bracket structure and then slides to drive the connecting portion on the testing component to connect the ligament to be tested. After connection, the outer cylinder structure is rotated, and the outer cylinder structure is locked and fixed with the bracket structure.

2. The intraoperative ligament tightness tester according to claim 1, wherein The bracket structure is connected to the bone tissue; The testing component and the tensile force component are provided inside the outer cylinder structure; The bracket structure is sleeved on the outer surface of the outer cylinder structure, and the outer cylinder structure slides on the bracket structure to drive the connecting portion to connect the ligament to be tested; When the outer cylinder structure rotates relative to the bracket structure, the outer cylinder structure is locked and fixed to the outer surface of the bracket structure.

3. The intraoperative ligament laxity tester according to claim 2, characterized in that, The outer cylinder structure is a cylindrical cavity with one end open and one end through-hole; the outer surface of the outer cylinder structure is connected to the bracket structure, and the outer cylinder structure sleeves the testing component and the tensile force component so that the testing component and the tensile force component slide inside the outer cylinder structure.

4. The intraoperative ligament laxity tester according to claim 1, wherein The testing component further includes an inner cylinder structure, and the inner cylinder structure is a cylindrical cavity with one end open and one end sealed; The inner cylinder structure sleeves the elastic portion, wherein the sealed portion of the inner surface is connected to one end of the elastic portion, the other end of the elastic portion is connected to the connecting portion, and the connecting portion extends out of the opening of the inner cylinder structure; The sealed end of the outer surface of the inner cylinder structure is connected to the tensile force component.

5. The intraoperative ligament laxity tester according to claim 4, characterized in that, Slot holes are provided on the side wall of the outer cylinder structure, and the displacement marking portion is provided on the outer surface of the side of the slot holes; When the elastic portion or the inner cylinder structure slides inside the outer cylinder structure, the marking member extends out along the slot hole so that the marking member moves along the displacement marking portion.

6. The intraoperative ligament laxity tester according to claim 1, characterized in that, A plurality of connecting members are provided on the bracket structure, and the bracket structure is fixed to the bone tissue through the connecting members.

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