TW202021555A - Cruciate ligament suspension screw - Google Patents

Abstract

A cruciate ligament suspension screw is provided to solve the problem where the ligament implant as implanted by the conventional surgery is prone to becoming loosened. The cruciate ligament suspension screw includes a hollow tube having at least one growth hole and a stopper structure, and a limiting member located in the hollow tube. The at least one growth hole extends through an inner surface to an outer surface of the hollow tube. The stopper structure is located on the outer surface of the hollow tube. Two ends of the limiting member connect to the inner surface of the hollow tube.

Description

Internal locking fixator for cruciate ligament suspension

The invention relates to a fixator, in particular to a cruciate ligament suspension internal locking fixator used for cruciate ligament reconstruction surgery.

The knee joint is the largest joint in the body. It is composed of the femur, tibia, fibula, and leftover bones (commonly known as kneecaps). It supports the weight of the human body and the flexion and extension of the knee. There are several ligaments at the knee joint that are responsible for the stability and movement of the knee joint. For example, the anterior cruciate ligament (ACL) prevents the tibia from moving forward, the posterior cruciate ligament (PCL) prevents the tibia from moving backward, and the lateral collateral ligament (LCL) prevents knee varus, The medial collateral ligament [MCL] prevents knee valgus. Among them, the anterior cruciate ligament is an important structure of the knee joint, and the common injury of the anterior cruciate ligament is a sudden external force applied to the knee joint to produce knee joint valgus, abduction, or over-extension distortion, which causes The anterior cruciate ligament ruptures in the knee joint, and most of them occur in sports injuries, motorcycle accidents, and falls.

The rupture and injury of the anterior cruciate ligament can be reconstructed through surgery to restore the original range of motion and function of the knee joint. Please refer to Figure 1. The conventional anterior cruciate ligament fixation method is to first combine a ligament implant b with a metal button c, and insert a femur d into a tunnel d1 (as indicated by the arrow) Show), so that the metal button c can be clamped on the outside of the femur d, the ligament implant b is located in the femoral tunnel d1 and falls into a tibial tunnel e1 of a tibia e, and then an interface nail f The tibial tunnel e1 is penetrated from the outside of the tibia e, so that the ligament implant b can be positioned between the femur d and the tibia e.

However, in the above-mentioned conventional anterior cruciate ligament fixation method, since the metal button c is positioned outside the femur d, when the ligament implant b is located in the femoral tunnel d1, the ligament implant b is a long-distance suspension In the hanging state, when the patient uses this part, the ligament implant b is likely to form unstable shaking, which causes the tunnel d1 to expand, which in turn causes the ligament implant b to loosen or tear, resulting in The quality of the operation is relatively poor.

Please refer to Figure 2, another conventional anterior cruciate ligament fixation method is to place one end of the ligament implant b into the femoral tunnel d1 from the inner side of the femur d, and the other end of the ligament implant b Fall into the tibial tunnel e1 of the tibia e, and then penetrate the femoral tunnel d1 from the inner side of the femur d by the two interface nail f, and penetrate the tibial tunnel e1 from the outer side of the tibia e, so that the ligament is implanted Object b can be positioned between the femur d and the tibia e. However, this fixing method causes poor healing of the contact surface between the femoral tunnel d1 and the ligament implant b, and it is easy to scratch the ligament implant b, resulting in unstable joints after reconstruction, resulting in poor surgical quality.

In view of this, the conventional anterior cruciate ligament fixation does still need to be improved.

In order to solve the above-mentioned problems, the object of the present invention is to provide a cruciate ligament suspension and internal locking fixator, which can stabilize a ligament implant in a femur and avoid unstable shaking of the ligament implant.

The second object of the present invention is to provide a cruciate ligament suspension and internal locking fixator, which can make the ligament implant and the femur integrated in a larger area.

Another object of the present invention is to provide a cruciate ligament suspension and internal locking fixator, which can prevent the ligament implant from being damaged by scratches.

Another object of the present invention is to provide a cruciate ligament suspension internal locking fixator, which can improve the convenience of surgery.

The directionality described in the full text of the present invention or its similar terms, such as "front", "rear", "left", "right", "up (top)", "down (bottom)", "inner", "outer" , "Side", etc., mainly refer to the directions of the attached drawings. Each directionality or similar terms are only used to help explain and understand the embodiments of the present invention, and are not used to limit the present invention.

The approximate terms such as "combination", "combination" or "assembly" mentioned in the full text of the present invention mainly include the types that can be separated without destroying the components after being connected, or the components can be made inseparable after being connected, which are common knowledge in the field Those can be selected based on the materials of the components to be connected or assembly requirements.

The cruciate ligament suspension internal locking fixator of the present invention includes: a hollow tube body with at least one growth-inducing hole and a backstop structure, the at least one growth-inducing hole penetrates an inner wall surface of the hollow tube body and An outer wall surface, the check structure is located on the outer wall surface of the hollow tube body; and a limiting member located in the hollow tube body, two ends of the limiting member are connected to the inner wall surface.

Accordingly, the cruciate ligament suspension and internal locking fixator of the present invention is implanted entirely in the tunnel, the backstop structure abuts on the inner wall of the tunnel, and the ligament implant can be suspended and abutted on the tunnel. The limiter, so that the ligament implant can be firmly fixed in the thigh tunnel, so as to ensure that the ligament implant does not produce unstable shaking and the thigh tunnel expands, which can improve postoperative quality and The effectiveness of reducing related risks.

Wherein, the hollow tube body has a first end and a second end opposite to each other, and the first end has a reduced diameter portion. In this way, the narrowed diameter portion can be penetrated toward the thigh tunnel, which has the effect of improving the convenience of the operation.

Wherein, the limiting member has an arc part, and the arc part faces the first end of the hollow tube body. In this way, the ligament implant can be hung against the arc part, which has the effect of avoiding damage to the ligament implant due to scratches.

Wherein, an axis direction is defined between the first end and the second end, and the at least one inducing growth hole is a long hole formed along the axis direction. In this way, the ligament implant and a femur can be integrated in a larger area and have the effect of improving the stability of the healing after surgery.

Wherein, the backstop structure has a plurality of long slopes and a plurality of short slopes, the short slopes and the plurality of long slopes are respectively connected to form a turning portion, each turning portion abuts against the inner wall of the tunnel . In this way, the structure is simple and easy to manufacture, and has the effect of reducing manufacturing costs.

Wherein, the backstop structure is formed in an inclined zigzag shape. The structure is simple and easy to manufacture, and has the effect of reducing manufacturing costs.

Wherein, the length of the hollow tube body is 25-30mm. In this way, the system has a sufficient length for the ligament implant to be combined, and has the effect of improving postoperative quality.

Wherein, the limiting member and the hollow tube body are integrally formed. In this way, it has the effect of improving the structural strength of the cruciate ligament suspension internal locking fixator.

In order to make the above and other objectives, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings:

Please refer to Figure 3, which is a preferred embodiment of the cruciate ligament suspension internal locking fixator of the present invention, which includes a hollow tube body 1 and a limiting member 2, the limiting member 2 is located at the Inside the hollow tube body 1.

Please refer to Figures 3 and 4, the hollow tube body 1 may have a first end 1a and a second end 1b opposite to each other, and an axial direction P is defined between the first end 1a and the second end 1b The hollow tube body 1 can be, for example, a square tube or a tube column of various shapes. The shape of the hollow tube body 1 is not limited in the present invention. In this embodiment, the hollow tube body 1 is circular It should be noted that the length of the hollow tube body 1 is preferably 25-30 mm, which is not limited by the present invention. The hollow tube body 1 has at least one growth-inducing hole 11, which penetrates an inner wall surface 12 and an outer wall surface 13 of the hollow tube body 1. The at least one growth-inducing hole 11 may be, for example, a square The size, number and shape of the at least one growth-inducing hole 11 are not limited by the present invention. In this embodiment, the at least one growth-inducing hole 11 is a long hole formed along the axis direction P The number of the at least one growth-inducing hole 11 is four.

The hollow tube body 1 may have a check structure 14 located on the outer wall 13 of the hollow tube body 1. In detail, the backstop structure 14 has a plurality of long inclined surfaces 14a and a plurality of short inclined surfaces 14b. The plurality of long inclined surfaces 14a are connected to the outer wall surface 13 of the hollow tube body 1, and the first end 1a faces the first The two ends 1b extend obliquely. In addition, the short oblique surfaces 14b are also connected to the outer wall surface 13 of the hollow tube body 1, and extend obliquely from the first end 1a toward the second end 1b. The short inclined surface 14b and the plurality of long inclined surfaces 14a are respectively connected to form a turning portion 14c, so that the backstop structure 14 can be formed in an inclined zigzag shape. In addition, the first end 1 a of the hollow tube body 1 may have a reduced diameter portion 15.

The limiting member 2 is located inside the hollow tube body 1. The limiting member 2 and the hollow tube body 1 are preferably integrally formed, for example, they can be made by 3D printing technology, and the present invention is not limited . In detail, both ends of the limiting member 2 are connected to the inner wall surface 12 of the hollow tube body 1, and the limiting member 2 may have an arc portion 21 facing toward the hollow tube body 1. The first end 1a.

Please refer to Figure 5, according to the foregoing structure, when the cruciate ligament suspension internal locking fixator of the present invention is used, a ligament implant L (as shown by the two-dot chain line in Figure 5) is selected first. The ligament implant L can be an artificial ligament, an allogeneic ligament or an autologous ligament. The present invention is not limited. The ligament implant L penetrates through the second end 1b of the hollow tube body 1 and bypasses the limit. Part 2, so that the ligament implant L can be hung against the arc part 21 of the stopper 2, and both ends of the ligament implant L expose the second end 1b of the hollow tube 1 so that The ligament implant L forms a symmetrical bending state.

Please refer to Figures 5 and 6. According to this, when the doctor wants to perform anterior cruciate ligament reconstruction surgery on the patient, first use a drill (not shown) to drill a tunnel X1 in a femur X , And drill a tibial tunnel Y1 on a tibia Y, the femoral tunnel X1 and the tibial tunnel Y1 can be connected to each other; then, the hollow tube body 1 penetrates the femoral tunnel X1 from the reduced diameter portion 15 so that The cruciate ligament suspending internal locking fixator can be implanted entirely in the tunnel X1, and the turning portions 14c of the backstop structure 14 can abut against the inner wall of the tunnel X1 to avoid the cruciate ligament suspension The inner locking fixator slides relative to the inner wall of the tunnel X1, so that the cruciate ligament suspension inner locking fixator can be firmly located in the tunnel X1.

At this time, both ends of the ligament implant L hang down into the tibial tunnel Y1, and finally an interface nail F is used to penetrate the tibial tunnel Y1 from one side of the tibia Y so that the ligament implant can be inserted into the tibial tunnel Y1. Both ends of L are squeezed and positioned in the tibial tunnel Y1, thereby preventing the ligament implant L from being suspended for a long distance, so as to ensure that the fixation force of the reconstruction of the ligament implant L can be increased, thereby avoiding the ligament The unstable shaking of the implant L and the expansion of the tunnel X1 have the effect of improving postoperative quality and reducing related risks.

Since the ligament implant L is suspended and abutted on the arc portion 21 of the limiting member 2, it can prevent the ligament implant L from being damaged due to scratches. In addition, since the hollow tube body 1 has at least one growth-inducing hole 11, the femur X can grow into the hollow tube body 1 through the at least one growth-inducing hole 11, so that the ligament implant L and The femur X can be integrated in a large area to improve the stability of the healing after the operation, so that the patient can recover as soon as possible after the operation. In particular, the cruciate ligament suspension internal locking fixator of the present invention can be made of metal materials or human body absorbable materials, and the present invention is not limited.

In summary, the cruciate ligament suspension internal locking fixator of the present invention is implanted entirely in the tunnel, the backstop structure abuts against the inner wall of the tunnel, and the ligament implant can be suspended and abutted In the limiting member, the ligament implant can be firmly fixed in the thigh tunnel, thereby ensuring that the ligament implant does not produce unstable shaking and the thigh tunnel expands, which has the effect of lifting Quality and effectiveness of reducing related risks.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art without departing from the spirit and scope of the present invention, making various changes and modifications relative to the above-mentioned embodiments still belongs to this The technical scope of the invention is protected, so the scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

﹝this invention﹞ 1: Hollow tube body 1a: first end 1b: second end 11: Induced growth hole 12: inner wall 13: Outer wall 14: Backstop structure 14a: Long slope 14b: Short slope 14c: Turning part 15: Diameter reduction 2: Limit parts 21: Arc part F: Interface nail L: Ligament implant P: axis direction X: Femur X1: strand tunnel Y: Tibia Y1: shin tunnel ﹝Used ﹞ b: artificial ligament c: metal buttons d: Femur d1: strand tunnel e: tibia e1: shin tunnel f: Interface nail

[Picture 1] A plan view of a conventional anterior cruciate ligament fixation method. [Picture 2] A plan view of another conventional anterior cruciate ligament fixation method. [Figure 3] A perspective view of a preferred embodiment of the present invention. [Figure 4] A partially cut-away perspective view of a preferred embodiment of the present invention. [Figure 5] A cross-sectional view of a preferred embodiment of the present invention combined with a ligament implant. [Figure 6] A use case diagram of a preferred embodiment of the present invention.

1: Hollow tube body

1a: first end

1b: second end

11: Induced growth hole

12: inner wall

13: Outer wall

14: Backstop structure

14a: Long slope

14b: Short slope

14c: Turning part

15: Diameter reduction

2: Limit parts

P: axis direction

Claims (8)

A cruciate ligament suspension internal locking fixator, comprising: a hollow tube body with at least one growth-inducing hole and a backstop structure, the at least one growth-inducing hole penetrating an inner wall surface and an outer surface of the hollow tube body On the wall surface, the check structure is located on the outer wall surface of the hollow tube body; and a limiting member is located in the hollow tube body, and two ends of the limiting member are connected to the inner wall surface. According to the cruciate ligament suspension internal locking fixator described in the first item of the patent application, the hollow tube body has a first end and a second end opposite to each other, and the first end has a reduced diameter portion. According to the cruciate ligament suspension internal locking fixator described in item 2 of the scope of patent application, wherein the limiting member has an arc portion, and the arc portion faces the first end of the hollow tube body. For the cruciate ligament suspension internal locking fixator described in item 2 of the scope of the patent application, wherein an axis direction is defined between the first end and the second end, and the at least one growth-inducing hole is located along the axis direction Form long holes. For example, the cruciate ligament suspension internal locking fixator described in item 1 of the scope of patent application, wherein the backstop structure has a plurality of long inclined planes and a plurality of short inclined planes, and the plurality of short inclined planes are respectively opposite to the plurality of long inclined planes Connected to form a turning portion, and each turning portion abuts against the inner wall of a tunnel. For the cruciate ligament suspension internal locking fixator described in item 1 of the scope of the patent application, the backstop structure is formed in an oblique and sawtooth shape. For the cruciate ligament suspension internal locking fixator described in any one of items 1 to 6 of the scope of patent application, the length of the hollow tube body is 25-30mm. For the cruciate ligament suspension internal locking fixator described in item 7 of the scope of patent application, the limiting member and the hollow tube body are integrally formed.

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