Expansion orthosis working end and expansion orthosis

Abstract

The present application provides an expansion orthosis working end and an expansion orthosis, relating to the technical field of medical instruments. The expansion orthosis working end comprises an outer tube and a pull rod arranged in the outer tube. A front end of the pull rod is provided with elastic pieces, and the outer tube is provided with clearance ports. When the pull rod is pushed forward, the elastic piece can bulge out from the clearance port, and a rear end of the elastic piece is provided with a first bending part. A mounting groove formed on the pull rod divides a front end part of the pull rod into a first clamping plate and a second clamping plate, and the mounting groove sequentially comprises, from front to rear, a clamping part and a limiting part which is used for accommodating the first bending part. A locking ring is sleeved on the pull rod, and under a locking action of the locking ring, the first clamping plate and the second clamping plate clamp the elastic pieces. By improving the elastic pieces and a mounting structure thereof, the expansion orthosis working end provided by the present application solves the technical problem that a material with poor machining performance cannot be used as an elastic piece in an expansion orthosis.

Description

Working end of expansion orthosis and expansion orthosis Technical Field

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

[0002] Shape memory alloys (SMAs) are materials that achieve shape memory through thermoelasticity, martensitic transformation, and its reversal. To date, over 50 alloys with this effect have been discovered, and they are widely used in a variety of fields, including aerospace, mechanical electronics, biomedicine, bridge construction, and the automotive industry. Nitinol, one of these SMAs, not only exhibits shape memory and superelasticity but also exhibits excellent biocompatibility, meeting biological requirements. Consequently, it is widely used in medicine.

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

[0004] However, the mounting structure of the spring clip in the working end of the current expandable orthosis requires machining of the spring clip. Therefore, materials with poor machinability (such as nickel-titanium alloy) cannot be used as spring clips in expandable orthosis. Based on this, the spring clips of expandable orthosis are still made of stainless steel, which has better machinability.

[0005] Utility Model Content

[0006] To address the above-mentioned issues, this application provides a working endpiece for an expandable orthosis. By improving the spring clip and its mounting structure, this working endpiece solves the technical problem that materials with poor machinability cannot be used as spring clips in expandable orthosis. This application also provides an expandable orthosis with this working endpiece, achieving the same technical effects, which will not be further described here.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] A working end of an expansion orthosis includes an outer tube and a pull rod disposed within the outer tube. The front end of the pull rod is provided with a spring plate. The outer tube is provided with an escape opening. When the pull rod is pushed forward, the spring plate can bulge out from the escape opening. The rear end of the spring plate is provided with a first curved portion.

[0009] 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 bent portion in sequence from front to back;

[0010] A locking ring is sleeved on the pull rod, and the first clamping plate and the second clamping plate clamp the elastic sheet under the locking action of the locking ring.

[0011] Furthermore, in a free state, the width of the clamping portion of the mounting groove gradually increases from the back to the front.

[0012] Furthermore, two spring plates are provided at the front end of the pull rod, and the first curved portions of the two spring plates are in a back-to-back state.

[0013] Furthermore, a partition is provided in the outer tube between the two spring pieces.

[0014] Furthermore, a second guiding inclined surface is provided on one end of the elastic sheet facing away from the pull rod. When the suspended ends of the two elastic sheets are pressed against each other, the two second guiding inclined surfaces jointly form a pointed depression.

[0015] Furthermore, first guiding inclined surfaces are respectively provided on both sides of the suspended end of the partition, and the two first guiding inclined surfaces together form a sharp angle structure.

[0016] Furthermore, the spring piece is provided with a pre-bent portion.

[0017] 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 face each other, and the second curved portions extend backward and arch, thereby forming the pre-bent portion.

[0018] An expansion orthosis comprising the working end according to any one of claims 1 to 8.

[0019] The beneficial effects of the utility model are:

[0020] The embodiments of the present application provide an expandable orthosis working end with improved spring clips and their mounting structure. The improved spring clips and mounting structure eliminate the need for machining, such as milling, turning, or drilling, to secure the clips. This addresses the technical issue of materials with poor machinability being unable to be used as spring clips in expandable orthoses, and paves the way for the application of nickel-titanium alloys in expandable orthoses. Nickel-titanium alloys, due to their shape memory effect, superelasticity, and excellent biocompatibility, can be used as spring clips in expandable orthoses to improve their performance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a cross-sectional view of a working end of an expansion orthosis provided in an embodiment of the present application;

[0022] FIG2 is an enlarged structural diagram of part A in FIG1 ;

[0023] FIG3 is an enlarged structural diagram of part B in FIG1 ;

[0024] FIG4 is an enlarged structural diagram of portion C in FIG1 ;

[0025] Figure 5 is a schematic diagram of the installation structure of the spring;

[0026] FIG6 is an enlarged structural diagram of portion D in FIG5 ;

[0027] Figure 7 is a schematic structural diagram of the front end of the pull rod;

[0028] FIG8 is a schematic structural diagram of a shrapnel.

[0029] In the figure: 1, outer tube; 11, avoidance opening;

[0030] 2. Pull rod; 21. First clamping plate; 22. Second clamping plate; 23. Mounting groove; 231. Clamping portion; 232. Position limiting portion;

[0031] 3. Spring piece; 31. First curved portion; 32. Second curved portion; 33. Second guide slope; 34. Pre-bent portion;

[0032] 4. Locking ring;

[0033] 51. Partition plate; 511. First guide slope; 52. Connecting block. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be described in detail below in conjunction with the drawings in the embodiments of this application. The described embodiments are only part of the embodiments of this application, not all of the embodiments. All other embodiments obtained by those skilled in the art without creative work based on the embodiments of this application should fall within the scope of protection of this application.

[0035] For the convenience of description, the gripping end of the expansion orthosis is now defined as the rear end, and the opposite end is defined as the front end.

[0036] As shown in Figure 1, a working end of an expansion brace includes an outer tube 1 and a pull rod 2 arranged in the outer tube 1, and the pull rod 2 can slide back and forth relative to the outer tube 1. A spring shrapnel 3 is fixedly provided at the front end of the pull rod 2, and the front end of the spring shrapnel 3 extends to the front side of the pull rod 2 and is in a suspended state. A relief opening 11 corresponding to the spring shrapnel 3 is provided on the side wall of the outer tube 1. When the front end of the spring shrapnel 3 abuts against the outer tube 1 and pushes the pull rod 2 forward, the middle part of the spring shrapnel 3 can bulge out from the relief opening 11. At this time, the rotating expansion brace can scrape bone spurs and the like in the surgical area through the bulging spring shrapnel 3.

[0037] As shown in Figures 2, 5 and 7, the rear end of the spring piece 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 piece 3 under the locking action of the locking ring 4, and the spring piece 3 is clamped by the clamping portion 231 of the mounting groove 23.

[0038] Furthermore, to ensure that the first and second clamping plates 21, 22 can securely clamp the spring piece 3, as shown in Figures 2 and 7, the width of the clamping portion 231 of the mounting slot 23 gradually increases from rear to front in the free state, forming a trumpet-shaped structure. When the locking ring 4 is fitted over the pull rod 2, the first and second clamping plates 21, 22 elastically deform, thereby securing the spring piece 3. This allows the clamping force of the first and second clamping plates 21, 22 to be adjusted by pushing the locking ring 4 backward, ensuring that the first and second clamping plates 21, 22 securely clamp the spring piece 3.

[0039] The locking ring 4 can be a cylindrical structure or a conical structure. As a specific implementation, the locking ring 4 in this embodiment is a conical structure.

[0040] Here, the front end of the pull rod 2 can be provided with one or two spring clips 3. When two spring clips 3 are provided, as shown in FIG2 , the first curved portions 31 of the two spring clips 3 are facing away from each other. Accordingly, two escape openings 11 are provided on the side wall of the outer tube 1, and the two escape openings 11 correspond one-to-one with the spring clips 3.

[0041] As a specific implementation, two spring pieces 3 are provided at the front end of the pull rod 2 in this embodiment.

[0042] Furthermore, in order to ensure that the spring pieces 3 can bulge out from the corresponding avoidance openings 11, as shown in Figure 1, a partition 51 is provided in the outer tube 1 between the two spring pieces 3, and the 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 the end of the partition 51 facing the pull rod 2 is in a suspended state.

[0043] As a specific embodiment, as shown in FIG4 , a connecting block 52 is provided at the end of the partition 51 facing away from the pull rod 2 in this embodiment, and the cross-sectional shape of the connecting block 52 matches the cross-sectional shape of the inner cavity of the outer tube 1. The connecting block 52 is fixedly connected to the outer tube 1 by welding. For example, the connecting block 52 and the partition 51 are an integral structure.

[0044] Furthermore, as shown in FIG4 , the rear side of the connecting block 52 is located in front of the front side wall of the escape opening 11, and a certain distance M is provided between the rear side of the connecting block 52 and the front side wall of the escape opening 11. In this way, the hanging end of the spring piece 3 can be prevented from falling out of the escape opening 11.

[0045] Furthermore, as shown in Figures 3 and 6, first guide slopes 511 are provided on either side of the free end of the partition 51. The two first guide slopes 511 are symmetrically arranged and together form a sharp angle structure. A second guide slope 33 is provided on the end of the spring piece 3 facing away from the pull rod 2. When the free ends of the two spring pieces 3 abut against each other, the two second guide slopes 33 together form a sharp angled depression.

[0046] The reason for this design is that when the pull rod 2 is pulled backward to disengage the spring piece 3 from the partition 51, pushing the pull rod 2 forward again can allow the partition 51 to smoothly enter between the two spring pieces 3, avoiding the problem of jamming.

[0047] Furthermore, as shown in FIG5 , a pre-bent portion 34 is provided on the spring piece 3 , and the pre-bent portion 34 faces the corresponding avoidance opening 11 , and when the pull rod 2 is pushed forward, the spring piece 3 can continue to bend along the bending trend of the pre-bent portion 34 , and eventually bulge out from the avoidance opening 11 .

[0048] The reason for this design is that if the spring piece 3 is a straight structure, a large force needs to be applied when pushing the pull rod 2 at the beginning to bend the spring piece 3, which is not only inconvenient to operate, but may even cause the spring piece 3 to get stuck.

[0049] Furthermore, as shown in Figure 8 , the front end of the spring piece 3 is provided with a second curved portion 32 that bends to one side, and the bending direction of the second curved portion 32 is opposite to that of the first curved portion 31. As shown in Figure 5 , when the spring piece 3 is mounted on the pull rod 2 , the two free ends of the second curved portions 32 face each other, and the second curved portion 32 extends rearward and arches, thereby forming the pre-bent portion 34.

[0050] An expansion orthosis includes an operating handle and a working end provided 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 here.

[0051] Other embodiments obtained by those skilled in the art by combining, splitting, reorganizing, etc. the embodiments provided in this application do not exceed the scope of protection of this application.

[0052] The above specific implementation methods provide a detailed description of the purpose, technical solutions and beneficial effects of the embodiments of the present application. The above is only a specific implementation method of the embodiments of the present application and is not intended to limit the scope of protection of the embodiments of the present application. That is, any modifications, equivalent replacements, improvements, etc. made on the basis of the embodiments of the present application should be included in the scope of protection 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) disposed in the outer tube (1), wherein a spring piece (3) is disposed at the front end of the pull rod (2), and an escape opening (11) is disposed on the outer tube (1). When the pull rod (2) is pushed forward, the spring piece (3) can bulge out from the escape opening (11), characterized in that: The rear end of the spring piece (3) is provided with a first bent portion (31); A mounting groove (23) provided on the pull rod (2) divides the front end portion of the pull rod (2) into a first clamping plate (21) and a second clamping plate (22), and the mounting groove (23) includes, 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 elastic 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 provided 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, characterized in that: A partition (51) is provided in the outer tube (1) between the two spring pieces (3).

5. The working end of the expansion orthosis according to claim 4, characterized in that: One end of the spring piece (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 pieces (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 guide inclined surfaces (511) are respectively provided on both sides of the suspended end of the partition (51), and the two first guide inclined surfaces (511) together form a sharp angle structure.

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

8. The working end of the expansion orthosis according to claim 7, characterized in that: The front end of the spring piece (3) is provided with a second bent portion (32). When the spring piece (3) is mounted on the pull rod (2), the two suspended ends of the second bent portions (32) face each other, and the second bent 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 according to any one of claims 1 to 8.

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