Medical catheter with woven structure

Abstract

The utility model belongs to the field of medical catheters, and particularly relates to a medical catheter with a woven structure. The utility model provides a medical catheter with a woven structure. A catheter body comprises an inner layer, a woven layer and an outer layer. The braid layer is wrapped on the inner layer, and the outer layer is wrapped on the braid layer; the pipe body is provided with a plurality of sections, and the rigidities of the braid layers at different sections are different. According to the medical catheter with the woven structure, the rigidity requirements of different sections of the medical catheter are met by utilizing different woven structures and densities of the woven layer.

Description

Technical Field

[0001] This utility model belongs to the field of medical catheters, specifically relating to a medical catheter with a braided structure. Background Technology

[0002] A medical catheter is a flexible hollow tube that can be inserted into a tube, body cavity, or blood vessel. It is the most commonly used access device in percutaneous vascular interventional surgery, and almost all percutaneous vascular interventional surgeries require the establishment of surgical access through a medical catheter.

[0003] Based on the type of medical catheter, they can be divided into selective medical catheters, hemodynamic medical catheters, guiding medical catheters, and special medical catheters. Selective medical catheters are usually used for cannulation of vascular arches or visceral arteries. Special medical catheters include micro-medical catheters, flushing medical catheters, drainage medical catheters, central venous medical catheters, angiography and measurement medical catheters, exchange medical catheters, and balloon medical catheters.

[0004] Existing catheters have a uniform rigidity, which makes it impossible to achieve both distal softness to protect the blood vessel and proximal rigidity to provide delivery capability when faced with complex vascular patterns. Utility Model Content

[0005] The present invention provides a medical catheter with a braided structure, which can effectively solve the problems in the background art.

[0006] This utility model provides a medical catheter with a braided structure. The catheter body includes an inner layer, a braided layer, and an outer layer. The braided layer wraps around the inner layer, and the outer layer wraps around the braided layer. The catheter body is provided with several segments, and the rigidity of the braided layer is different in different segments.

[0007] As a further optimization of this utility model, the pipe body includes a support section and a bent section; the rigidity of the braided layer of the support section is greater than the rigidity of the braided layer of the bent section.

[0008] As a further optimization of this utility model, the end of the curved section is provided with a soft head; the soft head is not provided with a braided layer.

[0009] As a further optimization of this utility model, the inner layer is made of PTFE material and the outer layer is made of Pebax with barium sulfate.

[0010] As a further optimization of this utility model, the braided layer is made of 304 stainless steel, nickel-titanium alloy or nylon.

[0011] As a further optimization of this utility model, the woven layer is made of round or flat yarns woven into a mesh.

[0012] As a further optimization of this utility model, the curved section is an arc with a bending radius of 10-60mm and a bending angle of 90°-170°.

[0013] As a further optimization of this utility model, the curved section adopts a 1x1 braided structure; the support section adopts a 2x2 braided structure.

[0014] As a further optimization of this utility model, the weaving angle of the curved section braided layer is 50°-85°; the weaving angle of the support section braided layer is 35°-50°.

[0015] As a further optimization of this utility model, the pipe body includes a first-level bending section, a second-level bending section and a third-level bending section; the rigidity of the braided layer from the first-level bending section to the third-level bending section gradually decreases.

[0016] This utility model provides a medical catheter with a braided structure, which utilizes different braided structures and densities of the braided layers to meet the rigidity requirements of different segments of the medical catheter. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Example 1;

[0018] Figure 2 Mode Figure 1 Enlarged view of a partial cross-section;

[0019] Figure 3 yes Figure 1 A schematic diagram of the 1x1 braided structure of the braided layer;

[0020] Figure 4 yes Figure 1 Schematic diagram of the 2x2 braided structure of the braided layer;

[0021] Among them, the soft head is 1, the curved section is 2, the support section is 3, the inner layer is 4, the braided layer is 5, and the outer layer is 6. Detailed Implementation

[0022] Example 1

[0023] like Figure 1 , Figure 2 As shown, the medical catheter in this embodiment comprises three layers, with the innermost layer being the inner layer 4. The inner layer 4 is made of PTFE material. A braided layer 5 is formed by wrapping a braided material on the outer surface of the inner layer 4, and the braided material of the braided layer 5 is made of 304 stainless steel round wire. A layer of Pebax barium sulfate material is then wrapped on the braided layer 5 to form the outer layer 6.

[0024] In another embodiment, the woven fabric is made of materials such as nickel-titanium alloy or nylon instead of the 304 stainless steel used in this embodiment.

[0025] In another embodiment, the woven fabric is made of flat filaments or other shaped filaments instead of the round filaments in this embodiment.

[0026] In another embodiment, the outer layer 6 is replaced with materials such as nylon-Pebax, nylon-Vestamid, Poly Urethane-Pellethane, LLDPE, and ETFE-C-88AXB.

[0027] In this embodiment, the tube body is divided into three sections: a flexible head 1, a bent section 2, and a support section 3. One end of the bent section 2 is connected to the flexible head 1, and the other end of the bent section 2 is connected to the support section 3. The braided layers 5 of different sections of the tube body adopt different braiding structures or densities, resulting in different rigidities of the braided layers 5 in different sections.

[0028] The soft tip 1 only has an inner layer 4 and an outer layer 6, and no braided layer 5. Therefore, the soft tip 1 has the best softness, which can avoid the soft tip 1 being too hard and causing damage to the tissues inside organs such as the heart or liver.

[0029] The braided layer 5 of the curved segment 2 has a different braided structure or density than the braided layer 5 of the support segment 3, resulting in a lower rigidity of the braided layer 5 in the curved segment 2 compared to the support segment 3. The braided layer 5 of the curved segment 2 possesses a certain degree of rigidity, but it is not very strong. Therefore, the braided layer 5 of the curved segment 2 can effectively guide the soft tip 1 to the heart without irritating or damaging the blood vessels. Furthermore, the curved segment 2 also possesses a certain degree of flexibility, facilitating passage through various bends in the blood vessels.

[0030] In this embodiment, the curved segment 2 is an arc with a bending radius of 40mm and a bending angle of 150°. Of course, in other embodiments, the bending radius of the curved segment 2 can be set to other sizes such as 10mm, 22mm, 60mm, or the bending angle can be set to other angles such as 90°, 164°, 170°, etc., according to actual needs.

[0031] In this embodiment, the braided layer 5 of the support segment 3 has the highest rigidity. The greater rigidity of the support segment 3 facilitates the movement of the curved segment 2 through the blood vessel. The support segment 3 is straight. In other embodiments, the support segment 3 may also adopt other shapes with a certain curvature or bend.

[0032] In this embodiment, different weaving structures are used to achieve different rigidities between the woven layer 5 of the curved section 2 and the woven layer 5 of the support section 3.

[0033] Specifically, in this embodiment, the braided layer 5 of the curved segment 2 adopts a 1x1 braided structure, such as... Figure 3As shown, several steel wires are wound clockwise in a parallel array along their length onto the inner layer 4; then several more steel wires are wound counterclockwise in a parallel array along their length onto the inner layer 4. Each counterclockwise coiled wire is staggered with each clockwise coiled wire. In this embodiment, the angle between the counterclockwise and clockwise coiled wires is 50°. In other embodiments, the angle between the counterclockwise and clockwise coiled wires is 69°, 73°, 85°, or other angles.

[0034] In this embodiment, the braided layer 5 of the support section 3 adopts a 2x2 braided structure. For example... Figure 4 As shown, several steel wires are wound clockwise in a parallel array along their length onto the inner layer 4; then several more steel wires are wound counterclockwise in a parallel array along their length onto the inner layer 4. Each pair of counterclockwise spiraling wires is staggered with each pair of counterclockwise spiraling wires. In this embodiment, the angle between the counterclockwise and counterclockwise spiraling wires is 35°. In other embodiments, the angle between the counterclockwise and counterclockwise spiraling wires is 42°, 48°, 50°, or other angles.

[0035] In another embodiment, both the braided layer 5 of the curved segment 2 and the braided layer 5 of the support segment 3 adopt a 1x1 braided structure. The density of the braided layer 5 of the support segment 3 is less than that of the braided layer 5 of the curved segment 2, that is, the braided hole area of ​​the braided layer 5 of the support segment 3 is less than that of the braided hole area of ​​the braided layer 5 of the curved segment 2.

[0036] In another embodiment, both the braided layer 5 of the curved segment 2 and the braided layer 5 of the support segment 3 adopt a 2x2 braided structure. The density of the braided layer 5 of the support segment 3 is less than the braiding angle of the braided layer 5 of the curved segment 2, that is, the braided hole area of ​​the braided layer 5 of the support segment 3 is less than the braided hole area of ​​the braided layer 5 of the curved segment 2.

[0037] Example 2

[0038] This embodiment is largely the same as Embodiment 1, except that the pipe body in this embodiment has three bending sections: a primary bending section, a secondary bending section, and a tertiary bending section. The braided layers 5 of the primary, secondary, and tertiary bending sections also use different braiding structures or densities to gradually decrease the rigidity of the primary, secondary, and tertiary bending sections. Of course, in other embodiments, the rigidity of the primary, secondary, and tertiary bending sections can also gradually increase, depending on specific requirements.

[0039] In other embodiments, the catheter can also be configured with any number of segments, such as four or eight, and the rigidity of each segment varies due to different braiding structures or braiding densities.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A medical catheter with a braided structure, characterized in that, The tube body includes an inner layer, a braided layer, and an outer layer; the braided layer wraps around the inner layer, and the outer layer wraps around the braided layer; the tube body has several sections, and the rigidity of the braided layer varies in different sections; the tube body includes a support section and a curved section; the rigidity of the braided layer in the support section is greater than that in the curved section.

2. The medical catheter with a braided structure according to claim 1, characterized in that, The curved section has a soft end; the soft end does not have a braided layer.

3. A medical catheter with a braided structure according to claim 1, characterized in that, The inner layer is made of PTFE material, and the outer layer is made of Pebax with barium sulfate.

4. A medical catheter with a braided structure according to claim 1, characterized in that, The braided layer is made of 304 stainless steel, nickel-titanium alloy or nylon.

5. A medical catheter with a braided structure according to claim 1, characterized in that, The woven layer is made of round or flat yarns woven into a mesh.

6. A medical catheter with a braided structure according to claim 1, characterized in that, The curved section is an arc with a bending radius of 10-60mm and a bending angle of 90°-170°.

7. A medical catheter with a braided structure according to claim 1, characterized in that, The curved section uses a 1x1 braided structure; the support section uses a 2x2 braided structure.

8. A medical catheter with a braided structure according to claim 7, characterized in that, The weaving angle of the curved section braided layer is 50°-85°; the weaving angle of the support section braided layer is 35°-50°.

9. A medical catheter with a braided structure according to claim 1, characterized in that, The tube body includes a primary bend section, a secondary bend section, and a tertiary bend section; the rigidity of the braided layer gradually decreases from the primary bend section to the tertiary bend section.

Images