Distraction device for high tibial osteotomy operation

Abstract

The utility model provides a dilator for high tibial osteotomy. The dilator comprises a fixing arm, a supporting arm and a lead screw. The supporting arm is located above the fixed arm, and the front end of the supporting arm is lapped on the top surface of the front end of the fixed arm; the tail end of the fixing arm is connected with the tail end of the supporting arm through a lead screw, a first hole groove is formed in the tail end of the supporting arm, a first pin shaft is rotationally installed on the opposite side walls in the first hole groove, and a screw hole matched with the lead screw is formed in the middle of the first pin shaft in the radial direction; a limiting assembly is arranged at the tail end of the fixed arm and used for limiting axial displacement of the lead screw in the rotating process. The lead screw is rotated to drive the first pin shaft to move in the axial direction of the lead screw, so that the tail end of the supporting arm is lifted upwards, the supporting arm rotates around the first pin shaft at the tail end, and the opening angle between the supporting arm and the fixed arm is adjusted; the front ends of the supporting arm and the fixed arm do not need to be hinged through a pin shaft, follow-up cleaning and disinfection are convenient, cross infection is not prone to being caused when the device is used again, and repeated use is safer and more sanitary.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a distractor used in high tibial osteotomy surgery. Background Art

[0002] High tibial osteotomy is an important surgical method for the treatment of early and middle-stage knee osteoarthritis. By means of proximal tibial osteotomy, the force line of the lower limb can be transferred from the affected compartment to the normal compartment, thereby relieving knee pain and improving knee function.

[0003] When performing a high tibial osteotomy, the surgeon first cuts the tibia obliquely, then inserts a distractor into the osteotomy site and distracts it a certain distance. After the osteotomy, the tibia needs to be internally fixed, usually by inserting a steel plate for reinforcement, and finally the incision is sutured to complete the operation.

[0004] Existing spreaders generally include a fixed arm and a supporting arm. The tips of the fixed arm and the supporting arm (the end extending into the inner side of the osteotomy gap) are hinged. The hinge structure is complex, and bacteria are easily retained during subsequent cleaning and disinfection, which can easily lead to cross infection and other problems when used again. Summary of the invention

[0005] The present application provides a distractor for high tibial osteotomy surgery, which solves the problems of incomplete subsequent cleaning and disinfection due to the hinged front end of the existing distractor, and easy cross infection when reused.

[0006] The present application provides a spreader for high tibial osteotomy surgery, comprising a fixed arm, a support arm and a screw, wherein the fixed arm, the support arm and the screw form a triangle; the support arm is located above the fixed arm, and the front end of the support arm is placed on the front end top surface of the fixed arm; the tail end of the fixed arm is connected to the tail end of the support arm through a screw, and the tail end of the support arm is provided with a first hole groove, and a first pin shaft is rotatably installed on the opposite side walls in the first hole groove, and a screw hole matching the screw shaft is radially opened in the middle of the first pin shaft; the tail end of the fixed arm is provided with a limit assembly, which is used to limit the axial displacement of the screw shaft during rotation.

[0007] In the technical solution provided in the present application, the first pin is driven to move axially along the screw by rotating the screw, thereby lifting the tail end of the support arm upward, and the support arm rotates around the first pin at the tail end, thereby adjusting the support angle between the support arm and the fixed arm; the front end of the support arm and the fixed arm do not need to be hinged by a pin, which facilitates subsequent cleaning and disinfection, is not prone to cross infection when used again, and is safer and more hygienic to reuse.

[0008] In some embodiments, the limit assembly includes a bearing, and the bottom end of the screw rod is rotatably mounted in the bearing. By installing the bearing at the bottom end of the screw rod, the axial displacement of the screw rod can be limited, so that the screw rod drives the first pin shaft to displace axially along the screw rod during rotation, thereby adjusting the opening angle between the support arm and the fixed arm.

[0009] In some embodiments, a second hole groove is provided at the tail end of the fixed arm, and a second pin shaft is rotatably installed on the opposite side walls in the second hole groove. A mounting groove matching the bearing is provided in the middle of the second pin shaft, and the bearing is embedded in the mounting groove; the fixed arm can rotate around the second pin shaft in a vertical plane, and the supporting arm can rotate around the first pin shaft in a vertical plane, thereby improving the flexibility of adjusting the spreading angle between the fixed arm and the supporting arm.

[0010] In certain embodiments, a gripping portion is provided at the rear end of the fixed arm to facilitate gripping of the spreader during operation.

[0011] In some embodiments, the tail end of the support arm is located on the inner side of the grip portion, the inner side wall of the grip portion is an arc surface, and the grip portion is provided with angle scale lines; by designing the inner side wall of the grip portion to be an arc surface and providing angle scale lines on the grip portion, it is convenient to observe the opening angle.

[0012] In some embodiments, a rotary handle is provided at the top of the screw rod to facilitate rotating the screw rod to adjust the opening angle.

[0013] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings in this application are used to illustrate preferred embodiments, so that those skilled in the art can clearly understand various other advantages and benefits, and should not be considered as limitations of this application. In addition, the same reference numerals are used throughout the drawings to represent the same or similar components.

[0015] Figure 1 A three-dimensional diagram of a spreader in one embodiment of the present application;

[0016] Figure 2 This is a front view of a spreader in one embodiment of the present application;

[0017] Icons: 1. Fixed arm; 2. Support arm; 3. Screw rod; 4. First hole slot; 5. First pin shaft; 6. Second hole slot; 7. Second pin shaft; 8. Grip; 9. Rotary handle. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), unless otherwise clearly and specifically defined.

[0021] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0022] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0023] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0024] See also Figure 1-Figure 2 The embodiment of the present application provides a distractor for high tibial osteotomy surgery, comprising a fixed arm 1, a support arm 2 and a screw rod 3, wherein the fixed arm 1, the support arm 2 and the screw rod 3 form a triangle; the support arm 2 is located above the fixed arm 1, and the front end of the support arm 2 is placed on the front end top surface of the fixed arm 1; the tail end of the fixed arm 1 is connected to the tail end of the support arm 2 through the screw rod 3, and the tail end of the support arm 2 is provided with a first hole groove 4, and a first pin shaft 5 (the first pin shaft is horizontally installed) is rotatably installed on the opposite side walls in the first hole groove 4, and a screw hole matching the screw rod 3 is radially opened in the middle part of the first pin shaft 5 (not shown in the figure); the tail end of the fixed arm 1 is provided with a limit assembly for limiting the axial displacement of the screw rod 3 during rotation.

[0025] In the technical solution provided in the present application, the first pin shaft 5 is driven to move axially along the screw shaft 3 by rotating the screw shaft 3, thereby lifting the tail end of the support arm 2 upward, and the support arm 2 rotates around the first pin shaft 5 at the tail end, thereby adjusting the support angle between the support arm 2 and the fixed arm 1; the front end of the support arm 2 and the fixed arm 1 does not need to be hinged by a pin shaft, and subsequent cleaning and disinfection are convenient, and it is not easy to cause cross infection when used again, and repeated use is safer and more hygienic.

[0026] In some embodiments, the limit assembly includes a bearing (not shown in the figure), and the bottom end of the screw rod 3 is rotatably installed in the bearing (the bottom end of the screw rod 3 has no thread). By installing a bearing at the bottom end of the screw rod 3, the axial displacement of the screw rod 3 can be limited, so that the screw rod 3 drives the first pin shaft 5 to displace axially along the screw rod 3 during rotation, thereby adjusting the expansion angle between the support arm 2 and the fixed arm 1.

[0027] Please continue reading Figure 1In some embodiments, a second hole groove 6 is provided at the tail end of the fixed arm 1, and a second pin shaft 7 is rotatably installed on the opposite side wall in the second hole groove 6 (the second pin shaft is horizontally installed), and a mounting groove matching the bearing is provided in the middle part of the second pin shaft 7 (not shown in the figure), and the bearing is embedded in the mounting groove; the fixed arm 1 can rotate around the second pin shaft 7 in a vertical plane, and the support arm 2 can rotate around the first pin shaft 5 in a vertical plane, thereby improving the flexibility of adjusting the opening angle between the fixed arm 1 and the support arm 2.

[0028] Please continue reading Figure 1 In some embodiments, a gripping portion 8 is provided at the tail end of the fixed arm 1 to facilitate holding the spreader during operation. The gripping portion 8 is integrally formed with the fixed arm 1, and the structure is stable.

[0029] Please continue reading Figure 1 In some embodiments, the tail end of the support arm 2 is located on the inner side of the grip portion 8, the inner side wall of the grip portion 8 is an arc surface, and the grip portion 8 is provided with angle scale lines (not shown in the figure); by designing the inner side wall of the grip portion 8 to be an arc surface and providing angle scale lines on the grip portion 8, it is convenient to observe the opening angle.

[0030] Please continue reading Figure 1 In some embodiments, a rotary handle 9 is provided at the top of the screw rod 3 to facilitate rotating the screw rod 3 to adjust the opening angle.

[0031] The method of using the expander in this embodiment is as follows:

[0032] Place the spreader at the tibial opening, rotate the handle 9 to rotate the screw 3, and the support arm 2 is lifted upward along the screw 3 with the help of the first pin 5, and rotates around the first pin 5 to increase the angle between the support arm 2 and the fixed arm 1, thereby expanding the tibial opening; when adjusting the spreading angle of the spreader, the angle scale line of the grip 8 can be observed in real time. When the spreading angle reaches the required angle, stop rotating the handle 9, and spread the tibial opening to the specified angle through the support arm 2 and the fixed arm 1, so as to facilitate subsequent surgical operations.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A distractor for high tibial osteotomy, characterized in that: The invention comprises a fixed arm (1), a supporting arm (2) and a screw rod (3), wherein the fixed arm (1), the supporting arm (2) and the screw rod (3) form a triangle; the supporting arm (2) is located above the fixed arm (1), and the front end of the supporting arm (2) is placed on the front end top surface of the fixed arm (1); the tail end of the fixed arm (1) is connected to the tail end of the supporting arm (2) through the screw rod (3); the tail end of the supporting arm (2) is provided with a first hole groove (4), and a first pin shaft (5) is rotatably mounted on the opposite side walls in the first hole groove (4), and a screw hole matching the screw rod (3) is radially opened in the middle of the first pin shaft (5); the tail end of the fixed arm (1) is provided with a limit assembly for limiting the axial displacement of the screw rod (3) during the rotation process; The limiting assembly comprises a bearing, and the bottom end of the screw rod (3) is rotatably mounted in the bearing; a second hole groove (6) is provided at the tail end of the fixed arm (1), and a second pin shaft (7) is rotatably mounted on the opposite side wall in the second hole groove (6), and a mounting groove matching the bearing is provided in the middle of the second pin shaft (7), and the bearing is embedded in the mounting groove.

2. A distractor for high tibial osteotomy according to claim 1, characterized in that: A gripping portion (8) is provided at the rear end of the fixed arm (1).

3. A distractor for high tibial osteotomy according to claim 2, characterized in that: The tail end of the support arm (2) is located on the inner side of the gripping portion (8), the inner side wall of the gripping portion (8) is a curved surface, and angle scale lines are provided on the gripping portion (8).

4. The distractor for high tibial osteotomy according to claim 1, characterized in that: A rotary handle (9) is provided at the top end of the screw rod (3).

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