Working end of expansion orthosis and expansion orthosis

Abstract

The utility model provides a working end of an expansion orthosis and the expansion orthosis, and relates to the technical field of medical instruments. The dilation orthosis working end comprises an outer tube and a pull rod arranged in the outer tube, an elastic piece is arranged at the front end of the pull rod, a receding opening is formed in the outer tube, when the pull rod is pushed forwards, the elastic piece can bulge out of the receding opening, and a first bending part is arranged at the rear end of the elastic piece. A mounting groove formed in the pull rod divides the front end of the pull rod into a first clamping plate and a second clamping plate, and the mounting groove sequentially comprises a clamping part and a limiting part used for containing the first bent part from front to back. The pull rod is sleeved with a locking ring, and the first clamping plate and the second clamping plate clamp the elastic piece under the locking effect of the locking ring. According to the working end of the expansion orthosis, the elastic piece and the mounting structure of the elastic piece are improved, and the technical problem that materials with poor machining performance cannot serve as the elastic piece to be applied to the expansion orthosis is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a working end of an expansion orthosis and an expansion orthosis. Background Art

[0002] Shape memory alloys are materials that have shape memory effects through thermoelasticity and martensitic phase transformation and its inversion. So far, more than 50 alloys with shape memory effects have been found, which are widely used in aerospace, mechanical electronics, biomedicine, bridge construction, automotive industry and other fields. As one of the shape memory alloys, nickel-titanium alloy has the characteristics of good biocompatibility in addition to shape memory effect and superelasticity, and can meet the requirements of biology, so it is widely used in the medical field.

[0003] NiTi alloy is a hard material in the cold worked state and the titanium oxide layer on its surface makes it extremely abrasive, so it is difficult to process and cannot be processed by traditional machining techniques such as milling, turning or drilling.

[0004] However, the installation structure of the spring piece in the working end of the current expansion orthosis requires machining of the spring piece, so materials with poor machining performance (such as nickel-titanium alloy) cannot be used as spring pieces in the expansion orthosis. Based on this, the spring pieces of the current expansion orthosis are still made of stainless steel materials with better machining performance. Utility Model Content

[0005] In view of the above problems, the present application provides a working end of an expansion orthosis, which solves the technical problem that materials with poor machining performance cannot be used as spring pieces in expansion orthosis by improving the spring pieces and their installation structure. At the same time, the present application also provides an expansion orthosis with the working end, and achieves the same technical effect, which will not be repeated here.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A working end of an expansion orthosis comprises an outer tube and a pull rod arranged in the outer tube, a spring sheet is arranged at the front end of the pull rod, a relief opening is arranged on the outer tube, when the pull rod is pushed forward, the spring sheet can bulge out from the relief opening, and a first curved portion is arranged at the rear end of the spring sheet;

[0008] The mounting groove provided on the pull rod divides the front end of the pull rod into a first clamping plate and a second clamping plate, and the mounting groove includes a clamping portion and a limiting portion for accommodating the first curved portion in sequence from front to back;

[0009] A locking ring is sleeved on the pull rod, and the first clamping plate and the second clamping plate clamp the spring sheet under the locking action of the locking ring.

[0010] Furthermore, in a free state, the width of the clamping portion of the mounting groove gradually increases from the back to the front.

[0011] Furthermore, two spring sheets are arranged at the front end of the pull rod, and the first curved portions of the two spring sheets are in a back-to-back state.

[0012] Furthermore, a partition is provided in the outer tube between the two spring sheets.

[0013] Furthermore, a second guiding inclined surface is provided at one end of the spring sheet facing away from the pull rod, and when the suspended ends of the two spring sheets are pressed against each other, the two second guiding inclined surfaces jointly form a pointed depression.

[0014] Furthermore, first guiding inclined surfaces are respectively arranged on both sides of the suspended end of the partition, and the two first guiding inclined surfaces together form a sharp angle structure.

[0015] Furthermore, a pre-bent portion is provided on the spring sheet.

[0016] Furthermore, a second curved portion is provided at the front end of the spring sheet. When the spring sheet is mounted on the pull rod, the two suspended ends of the second curved portions are against each other, and the second curved portions extend backward and arch, thereby forming the pre-bent portion.

[0017] An expansion orthosis comprises the working end as described above.

[0018] The beneficial effects of the utility model are:

[0019] The working end of an expansion orthosis provided in the embodiment of the present application improves the shrapnel and its mounting structure. The improved shrapnel and its mounting structure can realize the installation and fixation of the shrapnel without the need for machining such as milling, turning or drilling of the shrapnel, which solves the technical problem that materials with poor machining performance cannot be used as shrapnel in expansion orthosis, and provides a prerequisite for the application of nickel-titanium alloy in expansion orthosis. Nickel-titanium alloy has shape memory effect, superelasticity and good biocompatibility. The application of shrapnel in expansion orthosis can improve the performance and service life of expansion orthosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a working end of an expansion orthosis provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0022] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of part B;

[0023] Figure 4 for Figure 1 A schematic diagram of the enlarged structure of the middle C part;

[0024] Figure 5 Schematic diagram of the installation structure of the shrapnel;

[0025] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of the D part;

[0026] Figure 7 is a schematic diagram of the structure of the front end of the pull rod;

[0027] Figure 8 It is a schematic diagram of the structure of the shrapnel.

[0028] In the figure: 1, outer tube; 11, avoidance;

[0029] 2. pull rod; 21. first clamping plate; 22. second clamping plate; 23. mounting groove; 231. clamping part; 232. limiting part;

[0030] 3. Spring piece; 31. First bending portion; 32. Second bending portion; 33. Second guiding inclined surface; 34. Pre-bending portion;

[0031] 4. Locking ring;

[0032] 51. partition; 511. first guide slope; 52. connecting block. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application, and the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those skilled in the art without creative work on the basis of the embodiments of the present application shall belong to the protection scope of the present application.

[0034] For the convenience of description, the holding end of the expansion orthosis is defined as the rear end, and the opposite end is defined as the front end.

[0035] like Figure 1As shown, a working end of an expansion orthosis includes an outer tube 1 and a pull rod 2 disposed in the outer tube 1, and the pull rod 2 can slide forward and backward relative to the outer tube 1. A spring 3 is fixedly disposed at the front end of the pull rod 2, and the front end of the spring 3 extends to the front side of the pull rod 2 in a suspended state. An escape opening 11 corresponding to the spring 3 is disposed on the side wall of the outer tube 1. When the front end of the spring 3 abuts against the outer tube 1 and pushes the pull rod 2 forward, the middle part of the spring 3 can bulge out from the escape opening 11, and at this time, the rotating expansion orthosis can scrape bone spurs and the like in the surgical area through the bulging spring 3.

[0036] like Figure 2 , Figure 5 and Figure 7 As shown, the rear end of the spring sheet 3 is provided with a first bent portion 31 bent to one side. The front end of the pull rod 2 is provided with a mounting groove 23, and the mounting groove 23 divides the front end of the pull rod 2 into a first clamping plate 21 and a second clamping plate 22. The mounting groove 23 includes a clamping portion 231 and a limiting portion 232 for accommodating the first bent portion 31 from front to back. The front end of the pull rod 2 is sleeved with a locking ring 4, and the first clamping plate 21 and the second clamping plate 22 clamp the spring sheet 3 under the locking action of the locking ring 4, and the spring sheet 3 is clamped by the clamping portion 231 of the mounting groove 23.

[0037] Furthermore, in order to enable the first clamping plate 21 and the second clamping plate 22 to reliably clamp the spring sheet 3, as shown in FIG. Figure 2 and Figure 7 As shown, in the free state, the width of the clamping portion 231 of the mounting groove 23 gradually increases from the back to the front, forming a trumpet-shaped structure. When the locking ring 4 is sleeved on the pull rod 2, the first clamping plate 21 and the second clamping plate 22 will be elastically deformed, thereby clamping the spring piece 3. In this way, the clamping force of the first clamping plate 21 and the second clamping plate 22 can be adjusted by pushing the locking ring 4 backward, so that the first clamping plate 21 and the second clamping plate 22 can reliably clamp the spring piece 3.

[0038] The locking ring 4 may be in a cylindrical structure or a conical structure. As a specific implementation, the locking ring 4 in this embodiment is in a conical structure.

[0039] Here, the front end of the pull rod 2 may be provided with one spring sheet 3 or two spring sheets 3. When two spring sheets 3 are provided, Figure 2 As shown, the first curved portions 31 of the two spring sheets 3 are in a back-to-back state. Correspondingly, two escape openings 11 are arranged on the side wall of the outer tube 1, and the two escape openings 11 correspond to the spring sheets 3 one by one.

[0040] As a specific implementation, two spring pieces 3 are provided at the front end of the pull rod 2 in this embodiment.

[0041] Furthermore, in order to ensure that the spring piece 3 can bulge out from the corresponding escape opening 11, as Figure 1 As shown, a partition 51 is provided inside the outer tube 1 between the two spring sheets 3, one end of the partition 51 facing away from the pull rod 2 is fixedly connected to the blind end of the outer tube 1, and one end of the partition 51 facing the pull rod 2 is suspended.

[0042] As a specific implementation method, Figure 4 As shown, in this embodiment, a connecting block 52 is provided at one end of the partition 51 facing away from the pull rod 2, and the cross-sectional shape of the connecting block 52 matches the cross-sectional shape of the inner cavity of the outer tube 1, and the connecting block 52 is fixedly connected to the outer tube 1 by welding. Exemplarily, the connecting block 52 and the partition 51 are an integrated structure.

[0043] Furthermore, if Figure 4 As shown, the rear side of the connecting block 52 is located in front of the front side wall of the escape opening 11, and there is a certain distance M between the rear side of the connecting block 52 and the front side wall of the escape opening 11. In this way, the suspended end of the spring piece 3 can be prevented from escaping from the escape opening 11.

[0044] Furthermore, if Figure 3 and Figure 6 As shown, first guide slopes 511 are respectively provided on both sides of the suspended end of the partition 51, and the two first guide slopes 511 are symmetrically arranged and together form a sharp angle structure. A second guide slope 33 is provided on one end of the spring sheet 3 facing away from the pull rod 2, and when the suspended ends of the two spring sheets 3 are pressed against each other, the two second guide slopes 33 together form a sharp angle depression.

[0045] The reason for such design is that when the pull rod 2 is pulled backwards to disengage the spring sheet 3 from the partition 51, pushing the pull rod 2 forward again can allow the partition 51 to smoothly enter between the two spring sheets 3, thus avoiding the problem of jamming.

[0046] Furthermore, if Figure 5 As shown, the spring sheet 3 is provided with a pre-bent portion 34 , which faces the corresponding escape opening 11 , and when the pull rod 2 is pushed forward, the spring sheet 3 can continue to bend along the bending trend of the pre-bent portion 34 , and finally bulge out from the escape opening 11 .

[0047] The reason for such design is that if the spring sheet 3 is a straight structure, a large force needs to be applied when the pull rod 2 is pushed at the beginning to bend the spring sheet 3, which is not only inconvenient to operate, but may even cause the spring sheet 3 to get stuck.

[0048] Furthermore, if Figure 8 As shown, the front end of the spring piece 3 is provided with a second curved portion 32 that is curved toward one side, and the bending directions of the second curved portion 32 and the first curved portion 31 are opposite. Figure 5 As shown, when the spring sheet 3 is mounted on the pull rod 2 , the suspended ends of the two second curved portions 32 are against each other, and the second curved portions 32 extend backward and arch, thereby forming the pre-bent portion 34 .

[0049] An expansion orthosis includes an operating handle and a working end disposed on the operating handle. The working end is the working end described in any of the above embodiments and will not be described in detail herein.

[0050] Other embodiments obtained by those skilled in the art by combining, splitting, reorganizing, etc. the embodiments of the present application on the basis of the embodiments provided in the present application do not exceed the protection scope of the present application.

[0051] The above specific implementation methods have detailed the purpose, technical solutions and beneficial effects of the embodiments of the present application. The above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. That is, any modifications, equivalent substitutions, improvements, etc. made on the basis of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A working end of an expansion orthosis, comprising an outer tube (1) and a pull rod (2) arranged in the outer tube (1), a spring sheet (3) being arranged at the front end of the pull rod (2), and an escape opening (11) being arranged on the outer tube (1), and when the pull rod (2) is pushed forward, the spring sheet (3) can bulge out from the escape opening (11), characterized in that: The rear end of the spring sheet (3) is provided with a first bent portion (31); The mounting groove (23) provided on the pull rod (2) divides the front end of the pull rod (2) into a first clamping plate (21) and a second clamping plate (22), and the mounting groove (23) comprises, from front to back, a clamping portion (231) and a limiting portion (232) for accommodating the first curved portion (31); A locking ring (4) is sleeved on the pull rod (2), and the first clamping plate (21) and the second clamping plate (22) clamp the spring sheet (3) under the locking action of the locking ring (4).

2. The working end of the expansion orthosis according to claim 1, characterized in that: In a free state, the width of the clamping portion (231) of the mounting groove (23) gradually increases from the back to the front.

3. The working end of the expansion orthosis according to claim 1, characterized in that: Two spring sheets (3) are arranged at the front end of the pull rod (2), and the first bent portions (31) of the two spring sheets (3) are in a back-to-back state.

4. The working end of the expansion orthosis according to claim 3 is characterized in that: A partition plate (51) is provided in the outer tube (1) between the two spring sheets (3).

5. The working end of the expansion orthosis according to claim 4 is characterized in that: One end of the spring sheet (3) facing away from the pull rod (2) is provided with a second guiding inclined surface (33); when the suspended ends of the two spring sheets (3) are pressed against each other, the two second guiding inclined surfaces (33) together form a pointed depression.

6. The working end of the expansion orthosis according to claim 4 or 5, characterized in that: First guiding inclined surfaces (511) are respectively arranged on both sides of the suspended end of the partition (51), and the two first guiding inclined surfaces (511) together form a sharp angle structure.

7. The working end of the expansion orthosis according to claim 3 is characterized in that: The spring sheet (3) is provided with a pre-bent portion (34).

8. The working end of the expansion orthosis according to claim 7, characterized in that: A second curved portion (32) is provided at the front end of the spring sheet (3). When the spring sheet (3) is mounted on the pull rod (2), the two suspended ends of the second curved portions (32) are facing each other, and the second curved portions (32) extend backward and arch, thereby forming the pre-bent portion (34).

9. An expansion orthosis, characterized in that: The invention comprises the working end as described in any one of claims 1 to 8.

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