Angle device for measuring acetabulum surgical angle in total hip replacement

Abstract

The utility model belongs to the field of total hip replacement surgical instruments, and particularly relates to an angle device for measuring an acetabulum surgical angle in total hip replacement. Comprising a first part with angle scales and a second part with a clamp, the first part is hinged to the second part, the included angle between the first part and the second part can be kept unchanged after the first part and the second part rotate, an angle pointer is hinged to the position, at the original point of the angle scales, of the first part, and the clamp on the second part is used for clamping and fixing a straight rod. After the clamp clamps and fixes the straight rod, the axis of the straight rod is perpendicular to the hinge shaft between the first part and the second part, and the axis of the straight rod and the hinge shaft between the angle pointer and the first part are located on the same plane. An operator can measure the implantation angle of the acetabular prosthesis in real time, so that the implantation angle can be timely adjusted in an operation; the angle device can also be used for measuring the angle when the acetabulum is rubbed and filed, so that the angle of the acetabulum after the acetabulum is rubbed and filed is consistent with the implantation angle of an acetabular prosthesis, the operation precision is improved, and the operation complications are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of total hip arthroplasty instruments, and particularly relates to an angle measuring device for measuring the surgical angle of the acetabulum during total hip arthroplasty. Background Technique

[0002] Total hip arthroplasty for treating hip joint diseases has the advantages of relieving joint pain, restoring joint function, maintaining joint stability, and repairing limb length, etc., and has been widely carried out clinically at present. During total hip arthroplasty, the implant angle of the prosthesis has always been one of the most concerned issues for clinicians. Because different implant angles may increase the incidence of postoperative complications, including joint impingement, postoperative pain, accelerated joint wear, early loosening, joint dislocation, or some unpredictable multiple unexpected situations. The placement angle of the prosthesis during total hip arthroplasty directly affects the flexion and extension range of motion and dislocation rate of the postoperative hip joint, and an appropriate acetabular angle is the basis for the stability of the prosthesis.

[0003] Such as Figure 1 shown, referring to the body coronal plane, the positioning of the acetabular anteversion during the operation by the operator is generally through visual inspection after arranging a suitable position, and the acetabular cup is positioned at a position with an abduction of 40° - 45° and an anteversion of 15°. Referring to the body coronal plane is the most commonly used positioning method. However, the visual inspection by the operator is subjective, with a relatively large deviation, and it is easy to cause inaccurate prosthesis position.

[0004] Sometimes a special positioning device is also used to place the acetabular prosthesis. Such as Figure 2 shown, the design principle of the positioning device is to install two short rods on the handle of the acetabular implant holder. One of the cross rods is parallel to the patient's body transverse axis, and the other longitudinal rod is parallel to the patient's body longitudinal axis. The angle between the axis of the acetabulum (i.e., the axis where the handle of the acetabular prosthesis holder is located) and the longitudinal rod is the surgical tilt angle, and this angle can be preset, and the preset angles of different positioning devices are different. Using a special positioning device can relatively accurately determine the angle, but this special positioning device is fixed at a certain angle and cannot vary from person to person. Moreover, this special positioning device can only be used when implanting the acetabular prosthesis. Before implanting the prosthesis, it is required to rasp the acetabulum according to the angle of implanting the prosthesis. If the rasping angle of the acetabulum is inconsistent with the implanting angle, it may be difficult to implant. Content of the Utility Model

[0005] The utility model aims to solve the problem that it is difficult to control the implant angle of the prosthesis during total hip arthroplasty.

[0006] The present utility model provides the following technical solution: An angle measuring device for measuring acetabular surgical angles during total hip arthroplasty, comprising a first part with angle scales and a second part with a fixture. The first part and the second part are hinged, and after rotation, the first part and the second part can maintain the included angle unchanged. An angle pointer is hinged at the origin of the angle scales on the first part. The fixture on the second part is used for clamping and fixing a straight rod. After the fixture clamps and fixes the straight rod, the axis of the straight rod is perpendicular to the hinge axis between the first part and the second part, and the axis of the straight rod and the hinge axis between the angle pointer and the first part are in the same plane.

[0007] Further, the fixture includes a fixed bracket, a movable bracket, and a mold. The fixed bracket is fixedly connected to the second part. The mold is installed on the movable bracket. The entrance of the cavity on the mold adapted to the straight rod faces the fixed bracket. The movable bracket and the fixed bracket are connected by connectors on both sides of the cavity. The connectors apply a force that brings the movable bracket and the fixed bracket closer together, so that the mold cooperates with the fixed bracket to clamp the straight rod.

[0008] Further, the fixed bracket is a straight plate, the movable bracket is a U-shaped plate, and connectors are connected between the two cross plates of the movable bracket and the fixed bracket. The mold is installed in the U-shaped groove of the movable bracket.

[0009] Further, the connectors include screws and bolts.

[0010] Further, the fixture is located on the side of the second part facing away from the first part.

[0011] Further, the first part includes a scale plate and a first connecting plate, and the second part includes a second connecting plate. The first connecting plate and the second connecting plate are hinged.

[0012] Further, a screw rod is provided at the origin of the scale plate. The angle pointer is rotatably sleeved on the screw rod. A washer and a nut are sleeved on the screw rod. When the nut is tightened, the angle pointer is pressed by the washer.

[0013] Further, angle marks are provided on the second connecting plate. The angle marks on the second connecting plate are centered on the hinge axis, and indication marks corresponding to the angle marks are provided on the first connecting plate.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] An angle measuring device for measuring acetabular surgical angles during total hip arthroplasty provided by the present utility model can more accurately control the abduction angle and anteversion angle during the implantation of the acetabular prosthesis. The operator can measure the implantation angle of the acetabular prosthesis in real time for timely adjustment during the operation. The angle measuring device can also be used to measure angles during acetabular rasping, so that the angle after acetabular rasping is consistent with the implantation angle of the acetabular prosthesis, improving the surgical precision and reducing surgical complications. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the implantation angle of the acetabular prosthesis;

[0017] Figure 2 It is a schematic diagram of clamping the acetabular prosthesis with an angle gauge for measuring the surgical angle of the acetabulum during total hip arthroplasty;

[0018] Figure 3 It is a three-dimensional view of the angle gauge for measuring the surgical angle of the acetabulum during total hip arthroplasty;

[0019] Figure 4 It is Figure 3 a side view of;

[0020] Figure 5 It is Figure 4 an enlarged view of part A in;

[0021] Figure 6 It is a schematic diagram of adjusting the abduction angle with an angle gauge for measuring the surgical angle of the acetabulum during total hip arthroplasty;

[0022] Figure 7 It is a schematic diagram of adjusting the anteversion angle with an angle gauge for measuring the surgical angle of the acetabulum during total hip arthroplasty.

[0023] In the figure: 1 - the first part; 1.1 - the scale plate; 1.2 - the first connecting plate; 1.3 - the indicating mark; 2 - the second part; 2.1 - the angle mark; 3 - the fixture; 3.1 - the fixed bracket; 3.2 - the movable bracket; 3.3 - the mold; 3.4 - the mold cavity; 4 - the angle scale; 5 - the angle pointer; 6 - the straight rod; 7 - the connecting piece; 8 - the nut. Detailed implementation manners

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Such as Figure 2As shown: An angle gauge for measuring acetabular surgical angles during total hip arthroplasty, comprising a first part 1 with angle graduations 4 and a second part 2 with a clamp 3. The first part 1 and the second part 2 are hinged, and the first part 1 and the second part 2 can maintain the included angle unchanged after rotation. An angle pointer 5 is hinged at the origin of the angle graduations 4 on the first part 1. The clamp 3 on the second part 2 is used to clamp and fix a straight rod 6. After the clamp 3 clamps and fixes the straight rod 6, the axis of the straight rod 6 is perpendicular to the hinge axis between the first part 1 and the second part 2, and the axis of the straight rod 6 and the hinge axis between the angle pointer 5 and the first part 1 are in the same plane.

[0026] The first part 1 includes a scale plate 1.1 and a first connecting plate 1.2. The second part 2 includes a second connecting plate. The first connecting plate 1.2 and the second connecting plate are hinged, and the included angle between the first connecting plate 1.2 and the second connecting plate is maintained unchanged by the frictional force at the hinge. The two ends of the hinge axis tighten the first connecting plate 1.2 and the second connecting plate, or the rotational resistance between the first connecting plate 1.2 and the second connecting plate and the hinge axis is relatively large, that is, a certain force is required to make the first connecting plate 1.2 and the second connecting plate rotate relative to each other, so that the abduction angle will not change without human intervention during the subsequent surgery after adjusting the abduction angle.

[0027] Other structures can also be adopted between the first connecting plate 1.2 and the second connecting plate to be movable when adjusting the included angle and fixed after adjusting the included angle. For example, a screw is used as the hinge axis between the first connecting plate 1.2 and the second connecting plate, and a nut is connected to the screw. When the nut is loosened, the first connecting plate 1.2 and the second connecting plate can rotate freely, and when the nut is tightened, the included angle between the first connecting plate 1.2 and the second connecting plate is fixed.

[0028] A screw is provided at the origin of the scale plate 1.1. The angle pointer 5 is rotatably sleeved on the screw, and a washer and a nut 8 are sleeved on the screw. When the nut 8 is tightened, the angle pointer 5 is pressed tightly through the washer, and the angle pointer 5 points to the target scale line and remains fixed. When the nut 8 is loosened, the angle pointer 5 can rotate freely.

[0029] As Figure 3 As shown: The clamp 3 includes a fixed bracket 3.1, a movable bracket 3.2 and a mold 3.3. The fixed bracket 3.1 is fixedly connected to the second part 2. The mold 3.3 is installed on the movable bracket 3.2. The entrance of the mold cavity 3.4 on the mold 3.3 adapted to the straight rod 6 faces the fixed bracket 3.1. The movable bracket 3.2 and the fixed bracket 3.1 are connected by connectors 7 on both sides of the mold cavity 3.4. The connectors 7 apply a force that makes the movable bracket 3.2 and the fixed bracket 3.1 approach each other, so that the mold 3.3 cooperates with the fixed bracket 3.1 to clamp the straight rod 6. After the connectors 7 relieve the force, the straight rod 6 can be taken out from the clamp 3.

[0030] The fixed bracket 3.1 is a straight plate, the movable bracket 3.2 is a U-shaped plate, and connecting members 7 are connected between the two cross plates of the movable bracket 3.2 and the fixed bracket 3.1. The mold 3.3 is installed in the U-shaped groove of the movable bracket 3.2. The connecting members 7 include screws and bolts, and bolts are selected in this embodiment.

[0031] The fixture 3 is located on the side of the second part 2 facing away from the first part 1, and there is a larger rotation space between the first part 1 and the second part 2.

[0032] As Figure 4 , Figure 5 shown: Angle marks 2.1 are provided on the second connecting plate. The angle marks 2.1 on the second connecting plate are centered on the hinge axis. Indication marks 1.3 corresponding to the angle marks 2.1 are provided on the first connecting plate 1.2. When the first connecting plate 1.2 rotates, the indication marks 1.3 change positions relative to the angle marks 2.1, assisting the operator to control the included angle between the first connecting plate 1.2 and the second connecting plate, that is, the abduction angle.

[0033] As Figure 6 shown, the first part 1 is kept horizontal, and the second part 2 is rotated to adjust the abduction angle. As Figure 7 shown, the angle pointer 5 is rotated to the target scale, and then the angle instrument is rotated as a whole so that the angle pointer 5 is parallel to the longitudinal axis of the body to complete the adjustment of the anteversion angle.

[0034] After replacing the movable bracket 3.2 and the mold 3.3 on the fixture 3, the fixture 3 can clamp the rasping sleeve, and the abduction angle and the anteversion angle can be controlled when rasping the acetabulum; after replacing the movable bracket 3.2 and the mold 3.3 on the fixture 3 back, the fixture 3 clamps the connecting rod when the acetabular prosthesis is implanted. The angle instrument is adjusted to match the angle after acetabular rasping, and the angle of the implanted acetabular prosthesis matches the angle of the acetabulum, significantly improving the surgical accuracy and significantly reducing postoperative complications. The angle instrument for measuring the acetabular surgical angle in the total hip arthroplasty of this embodiment has high practicability.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An angle meter for measuring the surgical angle of acetabulum during total hip replacement, characterized in that: The invention comprises a first part (1) with an angle scale (4) and a second part (2) with a clamp (3), wherein the first part (1) and the second part (2) are hinged and can maintain an angle after being rotated, an angle pointer (5) is hingedly connected to the first part (1) at the origin of the angle scale (4), and the clamp (3) on the second part (2) is used to clamp and fix a straight rod (6), and after the clamp (3) clamps and fixes the straight rod (6), the axis of the straight rod (6) is perpendicular to the hinge axis between the first part (1) and the second part (2), and the axis of the straight rod (6) and the hinge axis between the angle pointer (5) and the first part (1) are located in the same plane.

2. The angle gauge for measuring the surgical angle of the acetabulum during total hip replacement according to claim 1, characterized in that: The clamp (3) comprises a fixed support (3.1), a movable support (3.2) and a mold (3.3); the fixed support (3.1) is fixedly connected to the second part (2); the mold (3.3) is mounted on the movable support (3.2); the entrance of a mold cavity (3.4) on the mold (3.3) adapted to the straight rod (6) faces the fixed support (3.1); the movable support (3.2) and the fixed support (3.1) are connected via connecting pieces (7) on both sides of the mold cavity (3.4); the connecting pieces (7) apply a force to the movable support (3.2) and the fixed support (3.1) to bring them closer together, so that the mold (3.3) cooperates with the fixed support (3.1) to clamp the straight rod (6).

3. The angle meter for measuring the surgical angle of acetabulum in total hip replacement according to claim 2, characterized in that: The fixed bracket (3.1) is a straight plate, the movable bracket (3.2) is a U-shaped plate, the two horizontal plates of the movable bracket (3.2) and the fixed bracket (3.1) are connected by a connecting piece (7), and the mold (3.3) is installed in the U-shaped groove of the movable bracket (3.2).

4. The angle gauge for measuring the surgical angle of the acetabulum during total hip replacement according to claim 2, characterized in that: The connecting piece (7) comprises screws and bolts.

5. The angle gauge for measuring the surgical angle of the acetabulum during total hip replacement according to any one of claims 1 to 4, characterized in that: The clamp (3) is located on the side of the second part (2) facing away from the first part (1).

6. The angle meter for measuring the surgical angle of acetabulum in total hip replacement according to claim 1, characterized in that: The first part (1) comprises a scale plate (1.1) and a first connecting plate (1.2), and the second part (2) comprises a second connecting plate, and the first connecting plate (1.2) and the second connecting plate are hinged.

7. The angle gauge for measuring the surgical angle of the acetabulum during total hip replacement according to claim 6, characterized in that: A screw rod is provided at the origin of the scale plate (1.1), and an angle pointer (5) is rotatably sleeved on the screw rod. A washer and a nut (8) are sleeved on the screw rod. When the nut (8) is tightened, the angle pointer (5) is pressed by the washer.

8. The angle gauge for measuring the surgical angle of the acetabulum during total hip replacement according to claim 6, characterized in that: The second connecting plate is provided with an angle mark (2.1), the angle mark (2.1) on the second connecting plate is centered on the hinge axis, and the first connecting plate (1.2) is provided with an indication mark (1.3) corresponding to the angle mark (2.1).

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