A method of sheath pull wire installation and a method of sheath preparation

Abstract

The application discloses a sheath wire installation method and a sheath preparation method. The wire installation method comprises the following steps: 1) sleeving an inner layer tube on a mandrel; 2) abutting two pull tube units on the outer side of the inner layer tube; the pull tube unit comprises a pull tube body, a pull wire, a first supporting part and a second supporting part, the pull wire, the first supporting part and the second supporting part are located in the pull tube body, the first supporting part comprises a supporting wire, a supporting strip and a buffer unit connecting the supporting wire and the supporting strip; 3) manufacturing a metal braided layer so that the metal braided layer surrounds the inner layer tube and the two pull tube units; 4) extracting the second supporting part from the pull tube body; and 5) extracting the first supporting part from the pull tube body. The wire installation method makes the wire installation more convenient, and the prepared sheath is more flexible in wire bending.

Description

Technical Field

[0001] This application relates to the field of medical devices, specifically to a method for installing a sheath wire and a method for preparing a sheath. Background Technology

[0002] Catheter-guided interventional therapy is an important treatment method in modern medicine, with good results in interventional treatments in fields such as cardiology and urology. It mainly consists of components such as a sheath, catheter, guidewire, and balloon at the catheter tip. The sheath is a crucial component, providing the path for catheter insertion, and its flexible tip allows for directional adjustment of functional components such as the balloon at the catheter tip. Because the end of the sheath tube needs to be bent, it is generally equipped with a pull ring and a pull bar, allowing the end of the sheath tube to be bent by pulling the wire. Existing sheath tubes, when installing the wire, involve embedding a solid wire outside the inner tube. After the metal braided layer is completed, the embedded wire is pulled out, creating a cavity where the wire was placed. The wire is then inserted through this cavity. However, since the cavity is actually formed by the metal braided layer, the space is small, making wire insertion difficult. Another method is to arrange the pull tube and the wire inside it together with the inner tube and create a metal braid. Because the metal braided layer needs to be braided tightly, it compresses the pull tube, which in turn compresses the wire. Consequently, when pulling the wire, the friction between the wire and the pull tube makes the wire pulling difficult. Summary of the Invention

[0003] Purpose of the invention: This invention aims to overcome the deficiencies of the prior art and provide a method for installing a sheath wire and a method for preparing a sheath.

[0004] Technical solution: A method for installing a sheath cable, comprising the following steps:

[0005] 1) Fit the inner tube onto the mandrel;

[0006] 2) The two tube-drawing units are located outside the inner tube and abut against the inner tube; each tube-drawing unit includes a tube body, a draw wire, a first support part, and a second support part. The draw wire, the first support part, and the second support part are all located inside the tube body. The first support part includes a support line, a support bar, and a buffer unit connecting the support line and the support bar. The support line and the draw wire abut against the inner wall of the tube body. The support bar abuts against the draw wire. The cross-section of the buffer unit is arc-shaped. The second support part is installed between the support line and the support bar. The cross-section of the second support part is U-shaped. The support line, the support bar, the buffer unit, and the second support part all extend along the length direction of the draw wire.

[0007] 3) Fabricate a metal braided layer that surrounds the inner tube and the two tube-drawing units;

[0008] 4) Pull the second support part out of the tube body;

[0009] 5) Pull the first support part out of the tube body.

[0010] Furthermore, the first support part is integrally extruded; the second support part is integrally extruded.

[0011] Furthermore, the support strip has multiple strip-shaped protrusions for abutting the surface of the pull wire, and the cross-section of the strip-shaped protrusions is semi-circular.

[0012] Furthermore, the cross-section of the second support portion includes a first arc-shaped portion, a first straight portion connected to the first arc-shaped portion, a connecting arc-shaped portion connected to the first straight portion, a second straight portion connected to the connecting arc-shaped portion, and a second arc-shaped portion connected to the second straight portion.

[0013] In addition, this application also discloses a method for preparing a sheath, including the following steps;

[0014] 1) Fit the inner tube onto the mandrel;

[0015] 2) The two tube-drawing units are located outside the inner tube and abut against the inner tube; each tube-drawing unit includes a tube body, a draw wire, a first support part, and a second support part. The draw wire, the first support part, and the second support part are all located inside the tube body. The first support part includes a support line, a support bar, and a buffer unit connecting the support line and the support bar. The support line and the draw wire abut against the inner wall of the tube body. The support bar abuts against the draw wire. The cross-section of the buffer unit is arc-shaped. The second support part is installed between the support line and the support bar. The cross-section of the second support part is U-shaped. The support line, the support bar, the buffer unit, and the second support part all extend along the length direction of the draw wire.

[0016] 3) Fabricate a metal braided layer that surrounds the inner tube and the two tube-drawing units;

[0017] 4) Pull the second support part out of the tube body;

[0018] 5) Pull the first support part out of the tube body;

[0019] 6) Weld the two pull wires and pull rings together and secure them in place. Then, slip the pull rings over the metal braided layer.

[0020] 7) Slide the outer tube over the metal braided layer;

[0021] 8) Slide the heat shrink tubing over the outer tube;

[0022] 9) Heating the heat shrink tubing causes the inner tube, metal braided layer, and outer tube to form a single unit;

[0023] 10) Remove the heat shrink tubing;

[0024] 11) Remove the mandrel.

[0025] Furthermore, the cross-section of the support line includes a circular portion and a rectangular portion connected to the circular portion.

[0026] Furthermore, the first support part is integrally extruded; the second support part is integrally extruded.

[0027] Furthermore, the support strip has multiple strip-shaped protrusions for abutting the surface of the pull wire, and the cross-section of the strip-shaped protrusions is semi-circular.

[0028] Furthermore, the cross-section of the second support portion includes a first arc-shaped portion, a first straight portion connected to the first arc-shaped portion, a connecting arc-shaped portion connected to the first straight portion, a second straight portion connected to the connecting arc-shaped portion, and a second arc-shaped portion connected to the second straight portion.

[0029] Furthermore, the outer tube comprises a first outer tube, a second outer tube, and a third outer tube arranged in sequence, wherein the hardness of the first outer tube, the second outer tube, and the third outer tube decreases sequentially.

[0030] Beneficial effects: The pull wire installation method and sheath preparation method of this application are more convenient to manufacture, eliminating the subsequent operation of inserting the pull wire, and after the manufacturing is completed, there is sufficient space between the pull wire and the pull tube body, so that the pulling operation of the pull wire is smoother. Attached Figure Description

[0031] Figure 1 This is a schematic diagram showing the assembly of the mandrel, inner tube, tube drawing unit, metal braided layer, and outer tube.

[0032] Figure 2 This is a diagram showing the components of the sheath. Detailed Implementation

[0033] Reference numerals: 1 mandrel; 2 inner tube; 3 metal braided layer; 4 outer tube; 5 tube body; 6 pull wire; 7 first support part; 7.1 support line; 7.2 buffer unit; 7.3 support bar; 8 second support part; 8.1 first arc-shaped part; 8.2 first straight part; 8.3 connecting arc-shaped part; 8.4 second straight part; 8.5 second arc-shaped part.

[0034] Example 1

[0035] A method for installing a sheath cable includes the following steps:

[0036] 1) Fit the inner tube 2 onto the mandrel 1;

[0037] 2) The two tube-pulling units are located outside the inner tube 2 and abut against the inner tube 2; each tube-pulling unit includes a tube-pulling body 5, a pull wire, a first support part 7, and a second support part 8. The pull wire 6, the first support part 7, and the second support part 8 are all located inside the tube-pulling body 5. The first support part 7 includes a support line 7.1, a support bar 7.3, and a buffer unit 7.2 connecting the support line 7.1 and the support bar 7.3. The support line 7.1 and the pull wire 6 abut against the inner wall of the tube-pulling body 5, and the support bar 7.4 abuts against the pull wire 6. The cross-section of the buffer unit 7.2 is arc-shaped. The second support part 8 is installed between the support line 7.1 and the support bar 7.4. The cross-section of the second support part 8 is U-shaped. The support line 7.1, the support bar 7.4, the buffer unit 7.2, and the second support part 8 all extend along the length direction of the pull wire.

[0038] 3) Fabricate a metal braided layer 3 so that the metal braided layer 3 surrounds the inner tube 1 and the two tube drawing units;

[0039] 4) Pull the second support part 8 out of the tube body 5;

[0040] 5) Pull the first support part 7 out of the tube body 5.

[0041] The first support portion 7 is integrally extruded; the second support portion 8 is integrally extruded. The support strip 7.3 has multiple strip-shaped protrusions 7.4 for abutting the surface of the pull wire 6, and the cross-section of each strip-shaped protrusion 7.4 is semi-circular. The cross-section of the second support portion 8 includes a first arc-shaped portion 8.1, a first straight portion 8.2 connected to the first arc-shaped portion 8.1, a connecting arc-shaped portion 8.3 connected to the first straight portion 8.2, a second straight portion 8.4 connected to the connecting arc-shaped portion 8.3, and a second arc-shaped portion 8.5 connected to the second straight portion 8.4.

[0042] In the pull wire installation method of this application, the pull wire, the first support, and the second support are pre-installed inside the protective tube body after the metal braided layer is manufactured. Since both the buffer unit and the second support have curved surface structures, they both provide a buffering effect, and their combined performance is even better (after the metal braided layer tightly weaves the two pull tube units and the inner tube, the pull wire, the first support, and the second support within the pull tube unit still have some room to move). Therefore, after the metal braided layer is completed, the second support can be easily removed, and after the second support is removed, the first support is even easier to remove. Thus, after both the first and second supports are removed, the pull wire can be pulled more flexibly within the pull tube body. The cross-section of the second support is approximately U-shaped, and it mainly consists of a first straight portion and a second straight portion used to cooperate with the first support for support. This results in a small contact area, allowing the first and second supports to cooperate and form a support, while also making it easier to remove the second support. The strip-shaped protrusions at the support bar allow the support bar and the pull line to support each other while reducing the contact area between them, making it easier to pull out the first support section.

[0043] Example 2

[0044] A method for preparing a sheath includes the following steps:

[0045] 1) Fit the inner tube 2 onto the mandrel 1;

[0046] 2) The two tube-pulling units are located outside the inner tube 2 and abut against the inner tube 2; each tube-pulling unit includes a tube-pulling body 5, a pull wire 6, a first support part 7, and a second support part 8. The pull wire 6, the first support part 7, and the second support part 8 are all located inside the tube-pulling body 5. The first support part 7 includes a support line 7.1, a support bar 7.3, and a buffer unit 7.2 connecting the support line 7.1 and the support bar 7.3. The support line 7.1 and the pull wire 6 abut against the inner wall of the tube-pulling body 5, and the support bar 7.4 abuts against the pull wire 6. The cross-section of the buffer unit 7.2 is arc-shaped. The second support part 8 is installed between the support line 7.1 and the support bar 7.4. The cross-section of the second support part 8 is U-shaped. The support line 7.1, the support bar 7.3, the buffer unit 7.2, and the second support part 8 all extend along the length direction of the pull wire 6.

[0047] 3) Fabricate a metal braided layer 3 so that the metal braided layer 3 surrounds the inner tube 2 and the two tube drawing units;

[0048] 4) Pull the second support part 8 out of the tube body 5;

[0049] 5) Pull the first support part 7 out of the tube body 5;

[0050] 6) Weld the two pull wires 6 and the pull ring to fix them in place, and put the pull ring over the metal braided layer 3;

[0051] 7) Place the outer tube 4 over the metal braided layer 3;

[0052] 8) Slide the heat shrink tubing over the outer tube 4;

[0053] 9) Heat the heat shrink tubing to make the inner tube 2, the metal braided layer 3, and the outer tube 4 form a whole;

[0054] 10) Remove the heat shrink tubing;

[0055] 11) Remove the mandrel 1.

[0056] The first support portion and the second support portion are integrally extruded. The support strip has multiple strip-shaped protrusions for abutting the surface of the pull wire, and the cross-section of each strip-shaped protrusion is semi-circular. The cross-section of the second support portion includes a first arc-shaped portion, a first straight portion connected to the first arc-shaped portion, a connecting arc-shaped portion connected to the first straight portion, a second straight portion connected to the connecting arc-shaped portion, and a second arc-shaped portion connected to the second straight portion. The outer tube includes a first outer tube, a second outer tube, and a third outer tube arranged sequentially, with the hardness of the first outer tube, the second outer tube, and the third outer tube decreasing sequentially.

[0057] The sheath preparation method of Example 2 has the advantages of the wire installation method of Example 1, and the wire, together with the pull ring and the first, second and third outer tubes with different hardness, can achieve good bending of the sheath end.

[0058] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A method for installing a sheath tube guy wire, characterized in that, Includes the following steps: 1) Fit the inner tube onto the mandrel; 2) The two tube-drawing units are located outside the inner tube and abut against the inner tube; each tube-drawing unit includes a tube body, a draw wire, a first support part, and a second support part. The draw wire, the first support part, and the second support part are all located inside the tube body. The first support part includes a support line, a support bar, and a buffer unit connecting the support line and the support bar. The support line and the draw wire abut against the inner wall of the tube body. The support bar abuts against the draw wire. The cross-section of the buffer unit is arc-shaped. The second support part is installed between the support line and the support bar. The cross-section of the second support part is U-shaped. The support line, the support bar, the buffer unit, and the second support part all extend along the length direction of the draw wire. 3) Fabricate a metal braided layer that surrounds the inner tube and the two tube-drawing units; 4) Pull the second support part out of the tube body; 5) Pull the first support part out of the tube body.

2. The sheath tube guy wire installation method according to claim 1, characterized in that, The first support part is integrally extruded; the second support part is integrally extruded.

3. The sheath tube guy wire installation method according to claim 1, characterized in that, The support bar has multiple strip-shaped protrusions for abutting the surface of the pull wire, and the cross-section of the strip-shaped protrusions is semi-circular.

4. The sheath tube guy wire installation method according to claim 1, characterized in that, The cross-section of the second support portion includes a first arc-shaped portion, a first straight portion connected to the first arc-shaped portion, a connecting arc-shaped portion connected to the first straight portion, a second straight portion connected to the connecting arc-shaped portion, and a second arc-shaped portion connected to the second straight portion.

5. A method for preparing a sheath, characterized in that, Includes the following steps: 1) Fit the inner tube onto the mandrel; 2) The two tube-drawing units are located outside the inner tube and abut against the inner tube; each tube-drawing unit includes a tube body, a draw wire, a first support part, and a second support part. The draw wire, the first support part, and the second support part are all located inside the tube body. The first support part includes a support line, a support bar, and a buffer unit connecting the support line and the support bar. The support line and the draw wire abut against the inner wall of the tube body. The support bar abuts against the draw wire. The cross-section of the buffer unit is arc-shaped. The second support part is installed between the support line and the support bar. The cross-section of the second support part is U-shaped. The support line, the support bar, the buffer unit, and the second support part all extend along the length direction of the draw wire. 3) Fabricate a metal braided layer that surrounds the inner tube and the two tube-drawing units; 4) Pull the second support part out of the tube body; 5) Pull the first support part out of the tube body; 6) Weld the two pull wires and pull rings together and secure them in place. Then, slip the pull rings over the metal braided layer. 7) Slide the outer tube over the metal braided layer; 8) Slide the heat shrink tubing over the outer tube; 9) Heating the heat shrink tubing causes the inner tube, metal braided layer, and outer tube to form a single unit; 10) Remove the heat shrink tubing; 11) Remove the mandrel.

6. The method for preparing a sheath according to claim 5, characterized in that: The first support part is integrally extruded; the second support part is integrally extruded.

7. The method for preparing a sheath according to claim 5, characterized in that: The support bar has multiple strip-shaped protrusions for abutting the surface of the pull wire, and the cross-section of the strip-shaped protrusions is semi-circular.

8. The method for preparing a sheath according to claim 5, characterized in that: The cross-section of the second support portion includes a first arc-shaped portion, a first straight portion connected to the first arc-shaped portion, a connecting arc-shaped portion connected to the first straight portion, a second straight portion connected to the connecting arc-shaped portion, and a second arc-shaped portion connected to the second straight portion.

9. The method for preparing a sheath according to claim 5, characterized in that: The outer tube comprises a first outer tube, a second outer tube, and a third outer tube arranged in sequence, with the hardness of the first outer tube, the second outer tube, and the third outer tube decreasing sequentially.

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