Tool for improving sheathing canal cavity making process
By designing a tool for the sheath cavity formation process, the stability problems of cavity formation and thread drawing are solved in the braiding process, the different shrinkage rates during the heat treatment process, and the problem that cavity formation and thread drawing are not easy to penetrate into the thread drawing cavity, achieving better use effect and uniform inner cavity of the sheath tube, reducing production difficulty and cost.
Patent Information
- Application Number
- CN202421768712.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the existing sheath cavity formation process, the stability of the cavity formation wire and the drawing wire during the braiding process is difficult to ensure, resulting in poor use of the sheath tube; at the same time, the different materials of the cavity formation wire and the drawing wire lead to different shrinkage rates during the heat treatment process, affecting the uniformity of the cavity; in addition, the cavity formation wire is not easy to penetrate into the drawing wire cavity, which increases the difficulty and cost of production.
A tool for improving the sheath cavity formation process is designed, including a first fixing device, a second fixing device, a first clamping mechanism and a lumen tube, and fixing the lumen wire and the lumen wire are threaded connections to ensure their stability during the braiding process, and close the shrinkage rate through heat treatment, solving the problem that the lumen wire is not easy to penetrate into the lumen wire cavity.
Through the use of this tool, the use effect of the sheath tube is improved, the uniformity of the inner cavity is ensured, the difficulty and cost of production is reduced, and the safety and efficiency of the surgery are enhanced.
Smart Images
Figure CN222917942U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of medical devices, and particularly relates to a tooling for improving the cavity-forming process of a sheath tube. Background Art
[0002] A sheath tube is a common medical device, which is mainly used to protect and guide other medical devices such as catheters and guide wires into the patient's body. The sheath tube is usually made of materials with good biocompatibility and mechanical properties, such as polytetrafluoroethylene, silicone rubber, etc. The inner cavity of the sheath tube needs to be uniform to ensure the smooth passage of other medical devices such as catheters and guide wires. In addition, the sheath tube also needs to have a certain strength and flexibility to adapt to different surgical environments and requirements.
[0003] In the existing technology, the cavity-forming process of the sheath tube is usually completed by a braiding machine. First, the cavity-forming wire and the pulling wire are braided together by the braiding machine, and then the cavity-forming wire and the pulling wire are shaped by heat treatment and other methods. This method can obtain a sheath tube with a uniform inner cavity, but due to the different diameters of the cavity-forming wire and the pulling wire, it is difficult to ensure the stability of the cavity-forming wire and the pulling wire during the braiding process, which may affect the use effect of the sheath tube.
[0004] There are some problems in the existing cavity-forming process of the sheath tube. First, due to the different diameters of the cavity-forming wire and the pulling wire, it is difficult to ensure the stability of the cavity-forming wire and the pulling wire during the braiding process, which may affect the use effect of the sheath tube. Second, due to the different materials of the cavity-forming wire and the pulling wire, their shrinkage rates are different during the heat treatment process, which will also affect the uniformity of the inner cavity of the sheath tube. In addition, there is also a problem that the cavity-forming wire is not easy to penetrate into the pulling wire cavity in the existing cavity-forming process, which may increase the production difficulty and cost. Summary of the Utility Model
[0005] Utility Model Objective: Solve the stability problem of the cavity-forming wire and the pulling wire during the braiding process to improve the use effect of the sheath tube.
[0006] Technical Solution:
[0007] A tooling for improving the cavity-forming process of a sheath tube, which is fixed at the rear end of a braiding machine, includes a first fixing device, a second fixing device, a first clamping mechanism and a cavity-forming tube. Both ends of the first clamping mechanism are threaded holes, which can be threadedly connected with the first fixing device and the second fixing device; the inner cavity diameter of the first fixing device is set to a size consistent with the diameter of the cavity-forming wire; the inner cavity diameter size of the second fixing device is set to a size consistent with the diameter of the pulling wire, so that the cavity-forming wire is relatively fixed in position with respect to the first fixing device, and the pulling wire is relatively fixed in position with respect to the second fixing device.
[0008] Further, the pulling wire is preferably a flat wire, and the flat wire is a wire characterized by its cross-section.
[0009] Furthermore, the pull wire may also be a round wire.
[0010] Further, the pull wire is a stainless steel pull wire, and the pull wire can be made of any other suitable material, such as spring steel, nickel titanium alloy or nickel cobalt based alloy.
[0011] Further, the draw wire is preferably from about 0.002" to about 0.016", more preferably from about 0.004" to about 0.012" or 0.016".
[0012] Furthermore, the second fixing device can be set to multiple cavities as needed, thereby forming multiple wire pulling cavities at the same time as needed to achieve simultaneous control of multiple wire pulling cavities. For example, a double-bend sheath requires 2 wire pulling cavities, while a four-bend sheath requires 4 wire pulling cavities.
[0013] The sheath of the present application has two metal braided layers, an inner braided layer and an outer braided layer, so that the sheath has better mechanical properties, and the inner layer is made of polytetrafluoroethylene material, so that the catheter moves more smoothly in the sheath. In addition, the present application has a first channel portion and a second channel portion, and a pull wire is inserted into the pipeline portion of the first and second channel portions, so that the pulling of the pull wire is smoother, and there are two pull wires, so that the end of the sheath can be bent to both sides, and the pull wire will be bent when it is welded and fixed with the pull ring, so that the pull wire is welded at the first groove portion position and welded at the accommodating groove position, so that the welding of the pull wire and the pull ring is more stable, making the bending operation of the pull wire more stable.
[0014] Compared with the existing technology, this technical solution mainly solves: 1) the stability problem of the cavity-making wire and the pull wire during the braiding process, so as to improve the use effect of the sheath; 2) the different shrinkage rates of the cavity-making wire and the pull wire during the heat treatment process, so as to ensure the uniformity of the inner cavity of the sheath; 3) the problem that the cavity-making wire is not easy to penetrate into the pull wire cavity, so as to reduce the difficulty and cost of production and other technical problems.
[0015] Compared with the existing technology, the beneficial effects of this technical solution are as follows:
[0016] 1. By adding a tool to fix the cavity-making wire at the rear end of the braiding machine, the cavity-making wire is fixed and braided into the inner layer of the metal wire, so that the cavity is fixed and consistent with the bending direction, which effectively solves the stability problem of the cavity-making wire and the pull wire and improves the use effect of the sheath;
[0017] 2. The size of the cavity-making wire is larger than that of the drawing wire. After the cavity is made, it is pulled out and then inserted into the drawing wire ring, so that the drawing wire cavity is consistent with the bending direction without deviation, and the drawing wire can be easily inserted and pulled, and the bending can be easily adjusted, which effectively solves the problem that the cavity-making wire is not easy to penetrate into the drawing wire cavity, and reduces the difficulty and cost of production;
[0018] 3. By improving the cavity-forming process, the inner cavity of the sheath tube becomes more uniform, ensuring the smooth passage of other medical devices such as catheters and guide wires, and improving the safety and efficiency of the operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of a spring-winding clamping tooling. SPECIFIC EMBODIMENTS
[0020] Reference numerals: 1 First fixing device; 2 First clamping mechanism; 3 Cavity-forming tube; 4 Second fixing device
[0021] The inside of the sheath tube includes a pulling wire, which extends from the proximal end to the distal end of the sheath tube of the introducer along the length of the sheath tube. As used herein, "proximal" refers to the direction towards the end of the introducer or sheath tube that is close to the clinician, and "distal" refers to the direction away from the clinician and (usually) inside the patient. For a sheath tube with two-way bending adjustment, the pulling wires are fixed on opposite sides of the sheath tube, and each pulling wire extends substantially linearly from the proximal end to the distal end of the sheath tube. In use, one of the pulling wires is shortened to put it under tension, so that the deflectable part at the distal end of the manipulable sheath tube deflects in the direction of the tensioned pulling wire. If the operator applies a torque to the handle to rotate the sheath tube along its central axis, the pulling wire rotates around the deflectable part of the sheath tube. If the pulling wire cavity is not straight, it will cause the problem that the pulling wire suddenly breaks during the stress process.
[0022] At the same time, in order to allow the guide wire or other instruments to pass through, a cavity will be provided in the middle of the sheath tube. During the braiding process of the sheath tube, in order to prevent the instability of the cavity-forming wire and the pulling wire from being difficult to guarantee due to their different diameters. Based on this, a tooling needs to be set at the back end of the braiding machine, so that the cavity-forming wire and the pulling wire are controllable during the forming process.
[0023] Specifically:
[0024] As Figure 1 shown, a tooling for improving the cavity-forming process of the sheath tube, which is fixed at the back end of the braiding machine, includes a first fixing device 1, a second fixing device 4, a first clamping mechanism 2 and a cavity-forming tube 3. The two ends of the first clamping mechanism 2 are threaded holes and can be threadedly connected to the first fixing device 1 and the second fixing device 4; the inner cavity diameter of the first fixing device 1 is set to a size consistent with the diameter of the cavity-forming wire; the inner cavity diameter size of the second fixing device 4 is set to a size consistent with the diameter of the pulling wire, so that the cavity-forming wire is relatively fixed in position with respect to the first fixing device 1, while the pulling wire is relatively fixed in position with respect to the second fixing device 4. Through the setting of this tooling, the positions of the pulling wire and the cavity-forming wire are fixed, making their positions controllable.
[0025] In order to facilitate the first fixing device 1 and the second fixing device 2 to change different inner diameter sizes, the first clamping mechanism 2 is a threaded mechanism.
[0026] In order to solve the problem that the cavity-making wire is difficult to insert into the pull-wire cavity, the size of the cavity-making wire is selected to be larger than the pull-wire specification. After the cavity is made, it is pulled out and then inserted into the pull-wire pull ring, so that the pull-wire cavity is consistent with the bending adjustment direction without deviation, and the pull-wire can be easily inserted and pulled, achieving the effect of easy bending adjustment.
[0027] According to the requirements of different breaking force and size, the pull wire is preferably a flat wire, which refers to a wire characterized by a cross section; the pull wire can also be a round wire. The pull wire is a stainless steel pull wire, and the pull wire can be made of any other suitable material, such as spring steel, Nitinol (nickel titanium alloy) or nickel-cobalt based alloy. The pull wire is preferably about 0.002" to about 0.016", more preferably about 0.004" to about 0.012" or 0.016".
[0028] The second fixing device 4 can be configured as a plurality of cavities as required, thereby forming a plurality of wire pulling cavities at the same time as required to achieve simultaneous control of a plurality of wire pulling cavities. For example, a double-bend sheath requires two wire pulling cavities, while a four-bend sheath requires four wire pulling cavities.
[0029] The sheath of the present application has two metal braided layers, an inner braided layer and an outer braided layer, so that the sheath has better mechanical properties, and the inner layer is made of polytetrafluoroethylene material, so that the catheter moves more smoothly in the sheath. In addition, the present application has a first channel portion and a second channel portion, and a pull wire is inserted into the pipeline portion of the first and second channel portions, so that the pulling of the pull wire is smoother, and there are two pull wires, so that the end of the sheath can be bent to both sides, and the pull wire will be bent when it is welded and fixed with the pull ring, so that the pull wire is welded at the first groove portion position and welded at the accommodating groove position, so that the welding of the pull wire and the pull ring is more stable, making the bending operation of the pull wire more stable.
[0030] The sheath extrusion process includes:
[0031] Step 1: Select a stainless steel wire with a diameter of 0.8 mm as the cavity wire and another stainless steel wire with a diameter of 0.6 mm as the pull wire. The length of these two wires is 1000 mm.
[0032] Step 2: Put the cavity-making wire and the pull wire into the braiding machine for braiding at the same time. At the rear end of the braiding machine, a tool is added to ensure the stability of the cavity-making wire during the braiding process.
[0033] Step 3: During the braiding process, the speed of the braiding machine is maintained at 1000 rpm and the braiding time is 30 minutes. This ensures that the braiding density of the cavity-making wire and the pull wire is consistent, thereby improving the use effect of the sheath.
[0034] Step 4: After the braiding is completed, the cavity-making wire and the pull wire are heat-treated together. The heat treatment temperature is 800℃ and the time is 2 hours. This heat treatment process can make the shrinkage rate of the cavity-making wire and the pull wire as close as possible to ensure the uniformity of the inner cavity of the sheath.
[0035] Step 5: After the heat treatment is completed, the cavity-making wire is pulled out from the wire-drawing cavity, and then the wire-drawing wire is inserted into the wire-drawing cavity. The wire-drawing cavity is consistent with the bending direction without deviation, and the wire-drawing wire can be easily inserted and pulled, and the bending can be easily adjusted.
[0036] Step 6: Finally, the cavity-making wire and the wire drawing wire are shaped together at a temperature of 600°C for 1 hour to make the shape of the sheath more stable, thereby increasing the service life of the sheath.
[0037] Through these steps, the stability problems of the cavity-making wire and the pull wire during the weaving process, the different shrinkage rates of the cavity-making wire and the pull wire during the heat treatment process, and the problem that the cavity-making wire is not easy to penetrate into the pull wire cavity are effectively solved, thereby improving the use effect of the sheath, ensuring the uniformity of the inner cavity of the sheath, and reducing the difficulty and cost of production.
[0038] Due to the advanced nature of this technical solution, it can be widely used in application fields such as medical device manufacturing, minimally invasive surgical equipment, and mechanical processing technology. First of all, this technical solution can effectively solve the stability problem in the existing sheath tube cavity creation process and the problem that the pull wire is not easy to penetrate the pull wire cavity, thereby improving the use effect and production efficiency of the sheath tube and reducing production costs. Secondly, this technical solution can ensure the uniformity of the inner cavity of the sheath tube, which is very important for minimally invasive surgical equipment, because the uniformity of the inner cavity of the sheath tube directly affects the passability of other medical devices such as catheters and guide wires, and then affects the safety and success rate of the operation. Finally, the implementation of this technical solution needs to rely on advanced mechanical processing technology, which will promote the development and progress of mechanical processing technology. Therefore, this technical solution has broad market demand and good application prospects.
[0039] Although the present application has been illustrated and described with respect to preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the present application without departing from the scope of the present application as defined by the claims.
Claims
1. A tool for improving the sheath tube cavitation process, characterized in that: include: A first fixing device, a second fixing device, a first clamping mechanism and a cavity-making tube, wherein both ends of the first clamping mechanism are threaded holes, which can be threadedly connected to the first fixing device and the second fixing device; the inner cavity diameter of the first fixing device is set to a size consistent with the diameter of the cavity-making wire; the inner cavity diameter of the second fixing device is set to a size consistent with the diameter of the pull wire, so that the positions of the cavity-making wire and the first fixing device are relatively fixed, and the positions of the pull wire and the second fixing device are relatively fixed.
2. A tool for improving the sheath tube cavity creation process according to claim 1, characterized in that: The second fixing device can be configured as a plurality of cavities as required, thereby forming a plurality of wire pulling cavities at the same time as required, thereby achieving simultaneous control of a plurality of wire pulling cavities.
3. A tool for improving the sheath tube cavity creation process according to claim 1, characterized in that: The pull wire is made of stainless steel, spring steel, nickel titanium alloy or nickel cobalt base alloy material.
4. A tool for improving the sheath tube cavity creation process according to claim 1, characterized in that: The pulling wire is flat wire or round wire.