Artificial hip joint acetabular prosthesis rotary cutting and extraction device

Abstract

The present invention discloses an artificial hip joint acetabulum prosthesis rotary cutting and extracting device, comprising a push rod, a telescopic device is provided on the top of the push rod, a connecting device is provided above the top of the push rod, the top of the fixing rod extends into the bottom circular hole of the push rod and is connected to the telescopic device, the bottom of the fixing rod is fixedly connected with a positioning ball head, the first connecting rod and the third connecting rod are hinged on both sides of the bottom circular hole of the push rod respectively, the other end of the first connecting rod is hinged on one end of the second connecting rod, the other end of the third connecting rod is hinged on one end of the fourth connecting rod, the other end of the second connecting rod and the other end of the fourth connecting rod are respectively located on both sides of the center of the positioning ball head, and are respectively hinged to the two ends of a rotating shaft arranged through the center of the positioning ball head, a first rotary cutting blade is provided at the hinged connection between the other end of the first connecting rod and one end of the second connecting rod, and a second rotary cutting blade is provided at the hinged connection between the other end of the third connecting rod and one end of the fourth connecting rod. The device is easy to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an artificial hip joint acetabular prosthesis rotational removal device. Background Art

[0002] During hip revision surgery, the previously implanted hip prosthesis needs to be removed. However, the previously implanted prosthesis-bone interface has bone ingrowth and is tightly integrated, making it difficult to remove the prosthesis easily.

[0003] At present, the method of removing the acetabular prosthesis mostly uses general tools such as bone knives to pry and chisel the bone outside the acetabular prosthesis, which leads to a series of problems such as additional bone loss and excessive blood loss, prolonged operation time, and increased difficulty in operation. The existing tools have the following disadvantages: first, the shape is not fit enough, and excessive bone is removed; second, it is easy to slip during operation, which makes the operation difficult.

[0004] In view of this, it is necessary to provide a rapid, safe, effective and easy-to-operate artificial hip joint acetabular prosthesis rotational removal device. Summary of the invention

[0005] The purpose of the invention is to provide an artificial hip joint acetabular prosthesis rotational removal device.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The first aspect of the present invention provides an artificial hip joint acetabular prosthesis rotary cutting and extracting device, including a push rod, which is a hollow cylinder. The bottom of the push rod is provided with a circular hole with a diameter slightly larger than the cross-sectional diameter of a fixed rod. A telescopic device is provided below the top of the push rod, that is, above the internal cavity of the cylinder. A connecting device is provided above the top of the push rod. The top of the fixed rod extends into the bottom circular hole of the push rod and is connected to the telescopic device. A positioning ball head is fixedly connected to the bottom of the fixed rod. A first connecting rod and a third connecting rod are hinged on both sides of the bottom circular hole of the push rod, respectively. The other end of the first connecting rod is hinged on one end of the second connecting rod, and the other end of the third connecting rod is hinged on one end of the fourth connecting rod. The other end of the second connecting rod and the other end of the fourth connecting rod are respectively located on both sides of the center of the positioning ball head, and are respectively hinged to the two ends of a rotating shaft set through the center of the positioning ball head. A first rotary cutting blade is provided at the hinged joint between the other end of the first connecting rod and one end of the second connecting rod, and a second rotary cutting blade is provided at the hinged joint between the other end of the third connecting rod and one end of the fourth connecting rod.

[0008] The connecting device is a solid cylinder, the cross-sectional diameter of the cylinder is 5 to 10 mm, and the length of the cylinder is 1.5 to 3 cm.

[0009] The telescopic device is a spring.

[0010] The length of the push rod is greater than the length of the fixing rod.

[0011] The first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod are all sheet-shaped or columnar structures and have the same length.

[0012] The fixing rod is a solid cylindrical structure and is integrally formed with the positioning ball head.

[0013] The positioning ball head is a solid spherical structure.

[0014] The first rotary cutting blade has a certain arc structure, which fits the shape of the target acetabular prosthesis. The lower end of the first rotary cutting blade is set as a wedge structure to facilitate grinding away bone tissue on the surface of the acetabular prosthesis.

[0015] The second rotary cutting blade has a certain arc structure, which fits the shape of the target acetabular prosthesis. The lower end of the second rotary cutting blade is set as a wedge structure to facilitate the removal of bone tissue on the surface of the acetabular prosthesis.

[0016] The first rotary cutting blade and the second rotary cutting blade are symmetrically arranged.

[0017] Due to the adoption of the above technical solution, the present invention has the following advantages and beneficial effects:

[0018] The artificial hip joint acetabular prosthesis rotary cutting and extraction device provided by the present invention has a rotary cutting blade that fits the shape of the acetabular prosthesis, can reduce bone loss, will not slip during operation, is easy to operate, and has replaceable parts such as a positioning ball head and a rotary cutting blade of different sizes, which are suitable for prostheses of different sizes, especially for the extraction of acetabular prostheses in ceramic artificial hip joint prostheses.

[0019] The artificial hip joint acetabular prosthesis rotary cutting and extracting device provided by the present invention uses a movable rotary cutting blade whose shape fits the shape of the acetabular prosthesis. During the rotation process, the rotary cutting blade (including a first rotary cutting blade and a second rotary cutting blade) grinds away the bone tissue around the acetabular prosthesis while being pushed by a push rod to penetrate into the bone-acetabular gap to further grind away the bone tissue on the surface of the acetabular prosthesis; the positioning ball head is used to locate and fix the position of the rotary cutting blade to prevent the rotary cutting blade from slipping, and two blades (a first rotary cutting blade and a second rotary cutting blade) are arranged on the left and right to offset and balance the swing of the instrument during rotary cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the artificial hip joint acetabular prosthesis rotational removal device according to an embodiment of the present invention.

[0021] Figure 2It is another schematic diagram of the overall structure of the artificial hip joint acetabular prosthesis rotational removal device according to an embodiment of the present invention.

[0022] Among them: 101 is a connecting device, 102 is a telescopic device, 103 is a push rod, 104 is a fixing rod, 105 is a first connecting rod, 106 is a second connecting rod, 107 is a first rotary cutting blade, 108 is a positioning ball head, 109 is a third connecting rod, 110 is a second rotary cutting blade, 111 is a fourth connecting rod, and 112 is an acetabular prosthesis. DETAILED DESCRIPTION

[0023] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0024] Example 1

[0025] An artificial hip joint acetabular prosthesis rotary cutting and extracting device, the structure is as follows Figure 1 and Figure 2 As shown, Figure 1 1 is a schematic diagram of the overall structure of the artificial hip joint acetabular prosthesis rotary removal device according to an embodiment of the present invention. Figure 2 is another schematic diagram of the overall structure of the artificial hip joint acetabular prosthesis rotary removal device according to an embodiment of the present invention, Figure 1 and Figure 2It can be seen that since the first connecting rod 105 and the second connecting rod 106, the third connecting rod 109 and the fourth connecting rod 111 are hingedly connected, in different use states, the angles of the first connecting rod 105 and the second connecting rod 106, the third connecting rod 109 and the fourth connecting rod 111 are different; it includes a push rod 103, which is a hollow cylinder, and a circular hole with a diameter slightly larger than the cross-sectional diameter of the fixed rod 104 is provided at the bottom of the push rod 103, and a telescopic device 102 is provided below the top of the push rod 103, that is, above the internal cavity of the cylinder, and a connecting device 101 is provided above the top of the push rod 103, and the top of the fixed rod 104 extends into the bottom circular hole of the push rod 103 and is connected to the telescopic device 102, and the bottom of the fixed rod 104 is fixedly connected There is a positioning ball head 108, and the first connecting rod 105 and the third connecting rod 109 are hinged on both sides of the bottom circular hole of the push rod 103, the other end of the first connecting rod 105 is hinged to one end of the second connecting rod 106, and the other end of the third connecting rod 109 is hinged to one end of the fourth connecting rod 111, the other end of the second connecting rod 106 and the other end of the fourth connecting rod 111 are respectively located on both sides of the center of the positioning ball head 108, and are respectively hinged to the two ends of the rotating shaft set through the center of the positioning ball head 108, a first rotary cutting blade 107 is provided at the hinge between the other end of the first connecting rod 105 and one end of the second connecting rod 106, and a second rotary cutting blade 110 is provided at the hinge between the other end of the third connecting rod 109 and one end of the fourth connecting rod 111.

[0026] The connecting device 101 is a solid cylinder, the cross-sectional diameter of the cylinder is 5 to 10 mm, and the length of the cylinder is 1.5 to 3 cm.

[0027] The telescopic device 102 is a spring.

[0028] The length of the push rod 103 is greater than the length of the fixing rod 104 .

[0029] The push rod 103 is a hollow cylinder, and there is no special requirement for the wall thickness, as long as it can meet the requirements of the present invention.

[0030] The first connecting rod 105 , the second connecting rod 106 , the third connecting rod 109 , and the fourth connecting rod 111 are all sheet-shaped or columnar structures with the same length and no special requirements for thickness, as long as they can meet the requirements of the present invention.

[0031] The fixing rod 104 is a solid cylindrical structure and is integrally formed with the positioning ball head 108 .

[0032] The positioning ball head 108 is a solid spherical structure. The size of the positioning ball head 108 can be replaced and can be adapted to the sizes of different acetabular cup bodies.

[0033] The first rotary cutting blade 107 has a certain arc-shaped structure, which fits the shape of the target acetabular prosthesis. The lower end of the first rotary cutting blade 107 is set as a wedge-shaped structure to facilitate grinding of bone tissue on the surface of the acetabular prosthesis.

[0034] The second rotary cutting blade 110 has a certain arc-shaped structure, which fits the shape of the target acetabular prosthesis. The lower end of the second rotary cutting blade 110 is set as a wedge-shaped structure to facilitate grinding of bone tissue on the surface of the acetabular prosthesis.

[0035] The first rotary cutting blade 107 and the second rotary cutting blade 110 are symmetrically arranged, and different sizes can be selected to match femoral heads and acetabular cups of different sizes.

[0036] The sizes of the positioning ball head 108 and the first and second rotary cutting blades 107 and 110 are manufactured in various different models according to the sizes of different acetabular liners and acetabular cup prostheses. During revision surgery, the size of the original implanted prosthesis is selected. In principle, the size of the positioning ball head 108 is consistent with the actual size of the femoral head, and the diameter of the circle where the inner wall of the first and second rotary cutting blades 107 and 110 are located is about 0.5-1mm larger than the actual outer wall diameter of the acetabular cup.

[0037] The connecting device 101 is used to connect to the interface of a common orthopedic electric drill (providing rotational power), and its size and shape are determined according to the requirements of the electric drill.

[0038] The use process of the artificial hip joint acetabular prosthesis rotary cutting and extraction device of the present invention is as follows: in the initial state of use, the connecting device 101 is connected to the electric drill providing power, the telescopic device 102 pushes the fixing rod 104 forward, and the positioning ball head 108 is against the ball socket of the liner to fix the position of the instrument, and the first rotary cutting blade 107 and the second rotary cutting blade 110 are placed at the acetabular cup opening. During operation, start the electric drill and push the electric drill forward with force. The force is transmitted in the order of electric drill> push rod 103> first connecting rod 105> third connecting rod 109> first rotary cutting blade 107, second rotary cutting blade 110, so that the first rotary cutting blade 107, second rotary cutting blade 110 cuts into the deep part. During the process, the telescopic device 102 keeps the positioning ball head 108 close to the ball socket of the lining of the acetabular prosthesis 112 to fix the entire instrument. The first rotary cutting blade 107, second rotary cutting blade 110 maintain a concentric circle relationship with the positioning ball head 108 and the outer wall of the acetabular prosthesis 112. As the electric drill pushes the push rod 103, the positions of the first rotary cutting blade 107 and the second rotary cutting blade 110 slowly slide from the upper part of the concentric circle to the lower part of the concentric circle until the acetabular cup can be taken out.

[0039] The artificial hip joint acetabular prosthesis rotary cutting and extraction device provided by the present invention has a rotary cutting blade that fits the shape of the acetabular prosthesis, can reduce bone loss, will not slip during operation, is easy to operate, and has replaceable parts such as a positioning ball head and a rotary cutting blade of different sizes, which are suitable for prostheses of different sizes, especially for the extraction of acetabular prostheses in ceramic artificial hip joint prostheses.

[0040] The artificial hip joint acetabular prosthesis rotary cutting and extracting device provided by the present invention uses a movable rotary cutting blade whose shape fits the shape of the acetabular prosthesis. During the rotation process, the rotary cutting blade (including a first rotary cutting blade and a second rotary cutting blade) grinds away the bone tissue around the acetabular prosthesis while being pushed by a push rod to penetrate into the bone-acetabular gap to further grind away the bone tissue on the surface of the acetabular prosthesis; the positioning ball head is used to locate and fix the position of the rotary cutting blade to prevent the rotary cutting blade from slipping, and two blades (a first rotary cutting blade and a second rotary cutting blade) are arranged on the left and right to offset and balance the swing of the instrument during rotary cutting.

[0041] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. An artificial hip joint acetabular prosthesis rotary cutting and extracting device, characterized in that: The top of the fixing rod extends into the bottom circular hole of the push rod and is connected with the telescopic device. The bottom of the fixing rod is fixedly connected with a positioning ball head on both sides of the bottom circular hole of the push rod, and the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the third connecting rod is hinged to one end of the fourth connecting rod, and the other end of the second connecting rod and the other end of the fourth connecting rod are respectively located on both sides of the center of the positioning ball head, and are respectively hinged to the two ends of the rotating shaft set through the center of the positioning ball head, and the other end of the first connecting rod is hinged to one end of the second connecting rod. A first rotary cutting blade is provided at the hinged position between the other end of the first connecting rod and one end of the second connecting rod, and a second rotary cutting blade is provided at the hinged position between the other end of the third connecting rod and one end of the fourth connecting rod; The connecting device is a solid cylinder; The telescopic device is a spring; The first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are all sheet-shaped or columnar structures and have the same length; The fixing rod is a solid cylindrical structure, and is integrally formed with the positioning ball head; The positioning ball head is a solid spherical structure; The first rotary cutting blade and the second rotary cutting blade are symmetrically arranged.

2. The artificial hip joint acetabular prosthesis rotary removal device according to claim 1, characterized in that: The cross-sectional diameter of the cylinder is 5 to 10 mm, and the length of the cylinder is 1.5 to 3 cm.

3. The artificial hip joint acetabular prosthesis rotary removal device according to claim 1, characterized in that: The length of the push rod is greater than the length of the fixing rod.

4. The artificial hip joint acetabular prosthesis rotary removal device according to claim 1, characterized in that: The first rotary cutting blade has a certain arc-shaped structure, which fits the shape of the target acetabular prosthesis. The lower end of the first rotary cutting blade is set as a wedge-shaped structure to facilitate grinding away bone tissue on the surface of the acetabular prosthesis.

5. The artificial hip joint acetabular prosthesis rotary removal device according to claim 1, characterized in that: The second rotary cutting blade has a certain arc structure, which fits the shape of the target acetabular prosthesis. The lower end of the second rotary cutting blade is set as a wedge structure to facilitate grinding away bone tissue on the surface of the acetabular prosthesis.

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