Tendon displacement equal-length measurer

Abstract

The tendon displacement equal-length measurer comprises a main rod, the main rod is provided with a through first channel in the axial direction of the main rod, the outer surface of the main rod is movably sleeved with a tension rod and a check block, and an elastic piece is connected between the check block and the tension rod; the tension bar is provided with a second channel communicated with the first channel; the check block is connected with a shell, and the outer surface of the shell is provided with a first scale corresponding to the displacement amount of deformation of the elastic piece and a second scale corresponding to the elastic force of deformation of the elastic piece.

Description

Technical Field

[0001] The utility model relates to the technical field of tendon measurement, in particular to a tendon displacement isometric measurer. Background Technique

[0002] During the process of knee ligament reconstruction, due to the requirement of full-range knee flexion, when implanting the ligament, the distance between the fixed points at both ends of the graft remains constant during knee movement to avoid being overstretched and loosened or the fixation at both ends fails due to different tensions after surgery. In fact, there is no absolute isometric point, but the point that minimizes the change in the length of the graft, that is, the approximate isometric point, has been found. The determining factor affecting isometry is each point on the femoral attachment, and the tibial attachment point has little influence, and this result has been generally recognized.

[0003] However, the research results of the position of the femoral isometric point by scholars vary greatly. Due to the difficulty in confirming the isometric position, in traditional surgeries, only based on the doctor's experience, approximate isometric point fixation is performed, and this method has large errors and uncertainties. Content of the Utility Model

[0004] Aiming at the deficiencies in the background technique, the purpose of the utility model is to provide a tendon displacement isometric measurer.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A tendon displacement isometric measurer, including a main rod. A through first channel is provided along the axial direction of the main rod. A tension rod and a stopper are movably sleeved on the outer surface of the main rod. An elastic member is connected between the stopper and the tension rod; a second channel communicating with the first channel is provided on the tension rod; the stopper is connected with a housing, and a first scale corresponding to the displacement amount of the deformation of the elastic member and a second scale corresponding to the elastic force of the deformation of the elastic member are provided on the outer surface of the housing.

[0007] Further, it further includes a torsion rod. The torsion rod is movably sleeved on one end of the main rod away from the tension rod, so that the torsion rod moves towards the stopper and presses the stopper.

[0008] Further, one end of the main rod close to the torsion rod is provided with a thread, and a corresponding thread groove is provided on the inner side surface of the torsion rod. The torsion rod and the main rod are connected by threads, and a handle extends outward from the torsion rod.

[0009] Further, a sliding rod is further provided between the stopper and the main rod. One end of the sliding rod is fixed to the stopper, and the other end is slidably connected to the torsion rod. The elastic member is sleeved outside the sliding rod and one end abuts against the stopper, and the other end of the elastic member abuts against the tension rod.

[0010] Further, a wire winding rod is provided at one end of the tension rod away from the main rod. The wire winding rod is arranged along the radial direction of the tension rod and penetrates through the second channel. When the traction wire is fixed to one end of the tendon and passes through the first channel and the second channel, the wire winding rod is used to fix one end of the traction wire in the second channel.

[0011] Further, at least two sliding grooves are provided at a position of the housing close to the tension rod along the axial direction of the tension rod. The first scale and the second scale are respectively located on one side of the two sliding grooves.

[0012] Further, a first connecting portion extends along the radial direction of the tension rod, and a second connecting portion extends along the radial direction of the block. One end of the sliding rod is fixed to the second connecting portion, and the other end penetrates through the first connecting portion.

[0013] Further, a positioning block is provided on the first connecting portion, and the positioning block is located in the sliding groove.

[0014] Further, the first connecting portion is at least two first connecting convex blocks symmetrically arranged along the central axis of the tension rod. The two first connecting convex blocks are provided with sliding holes. The second connecting portion is at least two second connecting convex blocks symmetrically arranged along the central axis of the block. The two second connecting convex blocks are provided with fixing holes. One end of the sliding rod penetrates through the sliding hole, and the other end of the sliding rod is fixed in the fixing hole.

[0015] Further, openings communicating the first channel and the second channel are provided on the main rod, the block, the tension rod, and the housing in the same direction.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. A tendon displacement isometric measuring device proposed by the present utility model is related to measuring the displacement of a ligament graft during the implantation of the anterior cruciate ligament or the posterior cruciate ligament (derived from the semitendinosus tendon) into the knee joint during knee flexion or extension movement. During the operation, a tension force is applied to the ligament. The measuring device is connected to one end of the ligament through a traction wire. When the knee is flexed or extended, by utilizing the change in spring elasticity and displacement change, the complex change process of the ligament during this movement process is displayed in the form of a displayed scale, and the desired result can be intuitively seen, achieving the effect of judging whether the ligament is installed at the isometric point position during the operation. If there is no substantial change in displacement during the process, or if it is within an acceptable range, such as a change range within 3 millimeters, the selected ligament fixation position meets the surgical conditions.

[0018] 2. A tendon displacement isometric measuring device proposed by the present utility model. By setting the tension rod, the tension rod can accurately sense and transmit the tension received by the ligament graft, and the tension rod can provide stable support to ensure the accuracy of measuring the displacement of the ligament graft.

[0019] 3. A tendon displacement isometric measuring device proposed by the present utility model. By setting the main rod, the main rod can provide structural stability for the entire device, ensuring that it will not shift or deform due to external forces or the tension of the ligament graft during the measurement process, thus guaranteeing the accuracy of the measurement. It can be adjusted according to different measurement requirements, such as changing the length, material or shape, to adapt to different parts.

[0020] 4. A tendon displacement isometric measuring device proposed by the present utility model. By setting the stopper, the elastic member can be effectively squeezed and deformed.

[0021] 5. A tendon displacement isometric measuring device proposed by the present utility model. By setting the elastic member, the elastic member can generate an accurate reaction force to the extrusion of the stopper, thereby accurately measuring the displacement of the ligament graft. It has the characteristic of restoring its original shape without external force, which enables it to automatically return to the initial position after one measurement is completed and prepare for the next measurement. By changing the material, diameter or number of turns of the spring, the measuring range of the measuring device can be adjusted to adapt to different intensities or ranges of tendon displacement.

[0022] 6. A tendon displacement isometric measuring device proposed by the present utility model. By setting the housing, it can protect the interior from the influence of the external environment such as dust, ensuring the normal operation and lifespan of the device. The outer surface of the housing has clear scales, making data reading and device operation more intuitive and simple.

[0023] 7. A tendon displacement isometric measuring device proposed by the present utility model. By setting the torsion rod, it rotates and moves to squeeze the stopper to generate a certain tension on the ligament by the tension rod.

[0024] 8. A tendon displacement isometric measuring device proposed by the present utility model. By setting the opening, the traction wire connected to one end of the ligament graft fixed in the tibial tunnel and femoral tunnel is placed in the channel through the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 This is the front view of an isometric tendon displacement measuring device of the present utility model;

[0027] Figure 2 This is the side view of an isometric tendon displacement measuring device of the present utility model;

[0028] Figure 3 This is the cross-sectional view of an isometric tendon displacement measuring device of the present utility model;

[0029] Figure 4 This is the front view of the stopper of an isometric tendon displacement measuring device of the present utility model;

[0030] Figure 5 This is the side view of the stopper of an isometric tendon displacement measuring device of the present utility model;

[0031] Figure 6 This is the top view of the stopper of an isometric tendon displacement measuring device of the present utility model;

[0032] Figure 7 This is the front view of the torsion bar of an isometric tendon displacement measuring device of the present utility model;

[0033] Figure 8 This is the top view of the torsion bar of an isometric tendon displacement measuring device of the present utility model;

[0034] Figure 9 This is the side view of the torsion bar of an isometric tendon displacement measuring device of the present utility model;

[0035] Figure 10 This is the front view of the housing of an isometric tendon displacement measuring device of the present utility model;

[0036] Figure 11 This is the side view of the housing of an isometric tendon displacement measuring device of the present utility model;

[0037] Figure 12 This is the top view of the housing of an isometric tendon displacement measuring device of the present utility model.

[0038] In the figure, 10 is the main rod; 20 is the tension rod; 201 is the wire winding rod; 202 is the first connecting part; 2021 is the sliding hole; 2022 is the positioning block; 30 is the stopper; 301 is the second connecting part; 40 is the housing; 50 is the torsion bar; 60 is the elastic member; 70 is the sliding rod; 80 is the opening; 90 is the sleeve; 3011 is the fixing hole; 401 is the chute; 501 is the handle. Specific embodiments

[0039] The following is a detailed description of the present utility model in conjunction with Figures 1-12 This will be described in detail below.

[0040] A tendon displacement isometric measuring device, as Figures 1-3 shown, includes a main rod 10. A through first channel is provided along the axial direction of the main rod 10. A tension rod 20 and a stopper 30 are movably sleeved on the outer surface of the main rod 10. An elastic member 60 is connected between the stopper 30 and the tension rod 20; the tension rod 20 is provided with a second channel communicating with the first channel; the stopper 30 is connected with a housing 40. The outer surface of the housing 40 is provided with a first scale corresponding to the displacement amount of the deformation of the elastic member 60 and a second scale corresponding to the elastic force of the deformation of the elastic member 60.

[0041] The above-mentioned elastic member 60 is a measuring spring. The range of the first scale is 0 - 20 mm, and the range of the second scale is 0 - 150 N. During the implantation of the anterior cruciate ligament or posterior cruciate ligament (derived from the semitendinosus tendon) into the knee joint surgery, the knee is bent or extended, and the displacement of the ligament graft is measured. During the surgery, a tension force is applied to the ligament. The measuring device is connected to one end of the ligament through a traction wire. The knee is bent or extended. By using the change of spring elastic force and displacement change, the complex change process of the ligament during this movement process is displayed in the way of showing the scale, and the desired result can be visually seen, achieving the effect of judging whether the ligament is installed at the isometric point position during the surgery. If there is no substantial change in displacement during the process, or if it is within an acceptable range, for example, the change range is within 3 mm, the selected ligament fixation position meets the surgical conditions.

[0042] In this embodiment, it further includes a torsion rod 50, as Figures 7-9 shown, the torsion rod 50 is movably sleeved on the end of the main rod 10 away from the tension rod 20, so that the torsion rod 50 moves towards the stopper 30 and presses the stopper 30. Further, one end of the main rod 10 close to the torsion rod 50 is provided with a thread, the inner side surface of the torsion rod 50 is provided with a corresponding thread groove, the torsion rod 50 and the main rod 10 are connected by the thread, and the torsion rod 50 extends outward with a handle 501.

[0043] In this embodiment, a slide rod 70 is further provided between the stopper 30 and the main rod 10. One end of the slide rod 70 is fixed to the stopper 30, and the other end is slidably connected to the torsion rod 50. The elastic member 60 is sleeved outside the slide rod 70 and one end abuts against the stopper 30, and the other end of the elastic member 60 abuts against the tension rod 20. Further, a winding rod 201 is further provided at the end of the tension rod 20 away from the main rod 10. The winding rod 201 is arranged along the radial direction of the tension rod 20 and passes through the second channel; when the traction wire is fixed at one end of the tendon and the traction wire passes through the first channel and the second channel, the winding rod 201 is used to fix one end of the traction wire in the second channel. The connection between the above-mentioned winding rod 201 and the tension rod 20 is laser welded by filler.

[0044] In this embodiment, as Figures 10-12As shown, at least two sliding grooves 401 are provided along the axial direction of the tension rod 20 at a position where the housing 40 is close to the tension rod 20. The first scale and the second scale are respectively located on one side of the two sliding grooves 401.

[0045] In this embodiment, a first connecting portion 202 extends in the radial direction of the tension rod 20. As Figures 4-6 shown, a second connecting portion 301 extends in the radial direction of the stopper 30. One end of the sliding rod 70 is fixed to the second connecting portion 301, and the other end passes through the first connecting portion 202. Further, a positioning block 2022 is provided on the first connecting portion 202, and the positioning block 2022 is located in the sliding groove 401. Further, the first connecting portion 202 is at least two first connecting protrusions symmetrically arranged along the central axis of the tension rod 20. The two first connecting protrusions are provided with sliding holes 2021. The second connecting portion 301 is at least two second connecting protrusions symmetrically arranged along the central axis of the stopper 30. The two second connecting protrusions are provided with fixing holes 3011. One end of the sliding rod 70 passes through the sliding hole 2021, and the other end of the sliding rod 70 is fixed in the fixing hole 3011. The above-mentioned housing 40 is fixed to the second connecting portion 301 of the stopper 30 by a pin. The above-mentioned sliding rod 70 is fixed in the fixing hole 3011 by fasteners such as screws and bolts.

[0046] In this embodiment, openings 80 communicating the first channel and the second channel are provided on the main rod 10, the stopper 30, the tension rod 20, and the housing 40 in the same direction.

[0047] In this embodiment, a sleeve 90 is further sleeved on the end of the main rod 10 away from the tension rod 20. The sleeve 90 includes a first fixing portion sleeved on the main rod 10 and a second fixing portion passing through the bone tunnel. The first fixing portion and the second fixing portion are provided with a coaxial third channel, and a limiting convex block is further provided outside the second fixing portion.

[0048] The usage method of a tendon displacement isometric measuring device provided by the present utility model is as follows:

[0049] Fix this measuring device to the ligament graft through a traction wire and place it in the bone tunnel. Pass the traction wire of the ligament graft through the two channels and then fix it to the winding rod 201 at the tail of the measuring device, so that the spring, the ligament in the bone tunnel, and the traction wire are in a pre-tightened state. Rotate the torsion rod 50 to make the ligament traction wire bear force. After reaching the required elastic force value, record the elastic force value and the scale corresponding to the spring deformation position. Then, flex and extend the knee joint to make the scale value corresponding to the spring deformation position change between the full-range flexion and extension activities. Observe the change amount of the elastic force value and the scale displacement corresponding to the spring deformation position on the measuring device, and obtain the required result through the changes of the elastic force value and the displacement amount.

[0050] The above embodiments are only used to illustrate the technical concept and features of the present utility model, and the purpose is to enable those skilled in the art to understand the content of the present utility model and implement it. However, it should not be used to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit and essence of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A tendon displacement isometric measuring device, comprising a main rod, characterized in that: The main rod is provided with a first channel penetrating along its axial direction, and a movable sleeve on the outer surface of the main rod is provided with a tension rod and a stopper, and an elastic member is connected between the stopper and the tension rod; the tension rod is provided with a second channel connected to the first channel; the stopper is connected to a shell, and the outer surface of the shell is provided with a first scale corresponding to the displacement of the elastic member and a second scale corresponding to the elastic force of the elastic member.

2. A tendon displacement isometric measuring device as claimed in claim 1, characterized in that: It also includes a torsion bar, which is movably sleeved on one end of the main rod away from the tension rod, so that the torsion bar moves toward the stopper and squeezes the stopper.

3. A tendon displacement isometric measuring device as claimed in claim 2, characterized in that: One end of the main rod close to the torsion bar is provided with a thread, the inner side of the torsion bar is provided with a corresponding thread groove, the torsion bar and the main rod are connected by threads, and the torsion bar extends outwardly with a handle.

4. A tendon displacement isometric measuring device as claimed in claim 2, characterized in that: A sliding rod is also provided between the stop block and the main rod, one end of the sliding rod is fixed to the stop block, and the other end is slidably connected to the torsion rod. The elastic member is sleeved outside the sliding rod and one end abuts against the stop block, and the other end of the elastic member abuts against the tension rod.

5. A tendon displacement isometric measuring device as claimed in claim 1, characterized in that: A winding rod is also provided at one end of the tension rod away from the main rod, and the winding rod is arranged along the radial direction of the tension rod and passes through the second channel; when the traction line is fixed to one end of the tendon and the traction line passes through the first channel and the second channel, the winding rod is used to fix one end of the traction line in the second channel.

6. A tendon displacement isometric measuring device as claimed in claim 4, characterized in that: At least two slide grooves are provided at a position of the housing close to the tension rod along the axial direction of the tension rod, and the first scale and the second scale are respectively located on one side of the two slide grooves.

7. A tendon displacement isometric measuring device as claimed in claim 6, characterized in that: The tension rod has a first connection portion extending along its radial direction, the stop block has a second connection portion extending along its radial direction, one end of the sliding rod is fixed to the second connection portion, and the other end is passed through the first connection portion.

8. A tendon displacement isometric measuring device as claimed in claim 7, characterized in that: A positioning block is provided on the first connecting portion, and the positioning block is located in the sliding groove.

9. A tendon displacement isometric measuring device as claimed in claim 8, characterized in that: The first connecting part is at least two first connecting protrusions symmetrically arranged along the central axis of the tension rod, and the two first connecting protrusions are provided with sliding holes. The second connecting part is at least two second connecting protrusions symmetrically arranged along the central axis of the block, and the two second connecting protrusions are provided with fixing holes. One end of the sliding rod is passed through the sliding hole, and the other end of the sliding rod is fixed in the fixing hole.

10. A tendon displacement isometric measuring device as claimed in claim 1, characterized in that: The main rod, the stopper, the tension rod and the shell are all provided with openings connecting the first channel and the second channel facing the same direction.

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