Anterior cruciate ligament stump expander

Abstract

The present invention discloses an anterior cruciate ligament stump expander, which relates to the technical field of medical devices, and comprises a guide needle, an expansion head and a handle, wherein one end of the guide needle is a guide needle head, and the other end of the guide needle is connected to the handle; the expansion head is mounted on the guide needle, the expansion head is fixedly connected to the guide needle, and the expansion head is arranged close to the guide needle head. The present invention can simply and efficiently achieve the maximum degree of wrapping of the residual ACL ligament around the graft.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to an anterior cruciate ligament stump expander. Background Art

[0002] Anterior cruciate ligament (ACL) injury is a common sports injury. The instability of the knee joint caused by ACL injury not only affects the patient's daily life and exercise, but also further affects other structures in the joint. Therefore, in order to restore the stability of the knee joint, it has been reached a consensus to reconstruct the damaged ACL.

[0003] In traditional ACL reconstruction surgery, the ACL stump is usually cleaned to clearly reveal the footprint area of ​​the femoral and tibial attachment points of the ACL. In recent years, the research focus of domestic and foreign scholars on ACL ligament reconstruction has not only focused on the recovery of biomechanical function after reconstruction, but also on the effects of ACL biological healing and proprioception recovery on knee joint motion function. Current studies have shown that there are mechanical receptors around the ACL ligament that control knee proprioception, most of which are located in the synovial endothelial structure near the tibial attachment point. They have the function of sensing joint position and balance, participating in nerve reflexes, and maintaining the stability of the knee joint by stimulating muscle coordinated contraction. Therefore, retaining the ACL ligament stump is conducive to the mechanical receptors being stretched into the graft, allowing it to regain nerve innervation and restore proprioception function. The blood supply of the ACL mainly comes from the branches of the middle genicular artery, and the distal part relies on the infrapopliteal artery that passes through the infrapatellar fat pad, eventually forming a synovial tissue vascular plexus surrounding the ligament tissue. Therefore, retaining the soft tissue vascular plexus around the ACL ligament stump can provide an important source of blood supply for the transplanted muscle, thereby promoting the process of revascularization of the graft.

[0004] Current studies have shown that after ACL reconstruction surgery, the internal opening of the bone tunnel will expand and dissolve. This is because the synovial fluid has a negative impact on the healing of the reconstructed ligament tendon bone, which eventually causes the graft to loosen. Retaining the ACL ligament stump can block the internal opening of the tunnel and prevent the synovial fluid from entering the bone tunnel. In addition, a sufficiently long stump may establish a new femoral-tibia connection, thereby increasing the overall tensile strength of the graft. Therefore, retaining the ACL ligament stump helps prevent the graft from loosening again. At present, retaining the ligament stump during surgery for patients with ACL rupture has gradually been recognized by clinicians. The ideal residual reconstruction is of course that the residual ligament completely surrounds the graft, and does not cause impact of the intercondylar fossa, cyclops deformity, and limited extension. However, in clinical practice, the presence of the stump often leads to unclear vision and inaccurate positioning, making it difficult to achieve the situation where the residual ligament surrounds the graft. The stump may even move forward too much and cause anterior impact.

[0005] Therefore, it is urgent to provide a new technology or device to solve the above problems existing in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide an anterior cruciate ligament stump expander to solve the problems existing in the above-mentioned prior art, and to simply and efficiently achieve the maximum extent of wrapping the graft with the residual ACL ligament.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides an anterior cruciate ligament stump expander, comprising a guide needle, an expansion head and a handle, wherein one end of the guide needle is a guide needle head, and the other end of the guide needle is connected to the handle; the expansion head is installed on the guide needle, the expansion head is fixedly connected to the guide needle, and the expansion head is arranged close to the guide needle head.

[0009] Preferably, the end of the guide needle head away from the guide needle is a pointed end.

[0010] Preferably, the tip is an acute-angle structure.

[0011] Preferably, the expansion head is an elliptical structure as a whole.

[0012] Preferably, the long axis of the expansion head is coaxially arranged with the long axis of the guide needle.

[0013] Preferably, the handle is a rectangular handle with a concave surface on one of the vertical end faces.

[0014] Preferably, the long axis of the concave surface is coaxially arranged with the long axis of the guide needle.

[0015] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0016] The anterior cruciate ligament stump expander provided by the present invention can relatively simply and efficiently achieve the maximum degree of wrapping of the graft by the residual ACL ligament, avoid intercondylar notch impact, thereby reducing postoperative complications and improving the prognosis of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a cross-sectional view of the anterior cruciate ligament stump expander of the present invention;

[0019] In the figure: 1-guide needle head, 2-expansion head, 3-guide needle, 4-handle, 41-concave surface. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The purpose of the present invention is to provide an anterior cruciate ligament stump expander to solve the problems existing in the prior art and to simply and efficiently achieve the maximum extent of wrapping the graft with the residual ACL ligament.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, this embodiment provides an anterior cruciate ligament stump dilator, including a guide needle 3, an expansion head 2 and a handle 4, one end of the guide needle 3 is a guide needle head 1, and the other end of the guide needle 3 is connected to the handle 4; the expansion head 2 is installed on the guide needle 3 close to the end of the guide needle head 1, and the expansion head 2 is fixedly connected to the guide needle 3.

[0024] In this embodiment, the end of the guide needle head 1 away from the guide needle 3 is a tip, and the tip may be an acute-angle structure.

[0025] In this embodiment, the expansion head 2 is an elliptical structure as a whole, and the long axis of the expansion head 2 is coaxially arranged with the long axis of the guide needle 3 .

[0026] In this embodiment, the handle 4 is a rectangular handle with a concave surface 41 provided on one vertical end surface, and the remaining surfaces of the rectangular handle are planar structures.

[0027] In this embodiment, the long axis of the concave surface 41 is coaxial with the long axis of the guide needle 3 .

[0028] The working principle of the anterior cruciate ligament stump expander in this embodiment is as follows:

[0029] When performing anterior cruciate ligament remnant preservation and reconstruction surgery, the center of the ACL tibial attachment point is located with the assistance of the anterior cruciate ligament locator, and then the tunnel diameter corresponding to the graft diameter is drilled. First, the anterior cruciate ligament stump expander with the expansion head 2 as the smallest size is used to determine the opening position of the ACL stump that needs to be expanded. The guide needle head 1 is used to support the expansion opening, and it is confirmed that the long axis direction of the guide needle 3 is approximately consistent with the long axis of the ACL stump. The concave surface 41 and the plane structure of the handle 4 are held, and the expansion head 2 is gradually advanced until the other end of the ACL stump, and the anterior cruciate ligament stump expander is pushed back. At this time, the first expansion is completed, and then the ACL stump is gradually expanded from small to large until it is expanded to the same diameter as the graft. Then, other operations of the ACL reconstruction are completed, and finally the graft is passed through the expanded ACL stump and fixed.

[0030] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An anterior cruciate ligament stump expander, characterized in that: It includes a guide needle, an expansion head and a handle, one end of the guide needle is the guide needle head, and the other end of the guide needle is connected to the handle; the expansion head is installed on the guide needle, the expansion head is fixedly connected to the guide needle, and the expansion head is arranged close to the guide needle head. The expansion head can be pushed through the handle to expand the anterior cruciate ligament stump.

2. The anterior cruciate ligament stump expander according to claim 1, characterized in that: The end of the guide needle head away from the guide needle is a pointed end.

3. The anterior cruciate ligament stump expander according to claim 2, characterized in that: The tip is an acute-angle structure.

4. The anterior cruciate ligament stump expander according to claim 1, characterized in that: The expansion head is an elliptical structure as a whole.

5. The anterior cruciate ligament stump expander according to claim 4, characterized in that: The long axis of the expansion head is coaxially arranged with the long axis of the guide needle.

6. The anterior cruciate ligament stump expander according to claim 1, characterized in that: The handle is a rectangular handle with a concave surface on one vertical end surface.

7. The anterior cruciate ligament stump expander according to claim 6, characterized in that: The long axis of the concave surface is coaxially arranged with the long axis of the guide needle.

Images