Catheter sheath with self-adaptive inner diameter

Abstract

The utility model provides a catheter sheath with a self-adaptive inner diameter. The catheter sheath at least comprises a catheter body; the elastic piece is arranged on the inner wall of the tube body, an inner ring of the elastic piece forms a channel allowing the medical instrument to pass through, and when the outer diameter of the medical instrument stretching into the channel is larger than the inner diameter of the channel, the elastic piece is extruded by the medical instrument to deform so that the inner diameter of the channel can be increased. According to the catheter sheath with the self-adaptive inner diameter, the elastic piece is arranged in the catheter body, the inner diameter of the channel formed by the inner ring of the elastic piece is adjustable, the catheter sheath can be matched with medical instruments with different outer diameters, the number of times of replacing the catheter sheath is reduced, the surgical risk and the operation difficulty are reduced, frequent contact between the catheter sheath and the inner wall of a blood vessel can be reduced, and the risk of blood vessel injury is reduced. Moreover, the elastic piece can also reduce the friction force between the medical instrument and the tube body and reduce the extrusion and scratch of the medical instrument to the blood vessel in the insertion and extraction process, so that the operation process is smoother, the operation burden of an operator is relieved, and the operation duration is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to an adaptive inner diameter catheter sheath. Background Art

[0002] Interventional therapy has been increasingly applied to clinical treatment due to its advantages such as less bleeding, less trauma, fewer complications, safety and reliability, and quick postoperative recovery. A catheter sheath is a commonly used surgical instrument in peripheral blood vessels and intracardiac blood vessels. It is mainly inserted after percutaneous puncture. Usually, a blood vessel access needs to be established to provide a channel for medical devices to quickly and effectively reach the lesion location during the operation. The catheter sheath mainly includes a puncture needle, a guide wire, and a tube body. Among them, the puncture needle is used to puncture the blood vessel percutaneously, and the guide wire is used to guide the medical device and the sheath tube into the artery.

[0003] However, when different medical devices are used during the operation, the corresponding catheter sheath needs to be replaced. Multiple replacements of the catheter sheath not only increase the operation time but also increase the risk of blood vessel injury. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is that in the prior art, when different medical devices are used during the operation, the corresponding catheter sheath needs to be replaced. Multiple replacements of the catheter sheath not only increase the operation time but also increase the risk of blood vessel injury. Thus, an adaptive inner diameter catheter sheath is provided.

[0005] To solve the above technical problem, the technical solution of the utility model is as follows:

[0006] The utility model provides an adaptive inner diameter catheter sheath, which at least includes: a tube body; an elastic member disposed on the inner wall of the tube body, an inner circle of the elastic member forms a channel for a medical device to pass through. When the outer diameter of the medical device extending into the channel is greater than the inner diameter of the channel, the elastic member is squeezed and deformed by the medical device so that the inner diameter of the channel increases.

[0007] Further, a groove is provided on the inner wall of the tube body; the elastic member is disposed in the groove, and when the elastic member is in a natural state, the inner diameter of the channel formed by the inner circle of the elastic member is smaller than the inner diameter of the tube body.

[0008] Further, the elastic member is configured as a tube-shaped framework with a net-shaped tube wall; the groove is adapted to the structure of the elastic member.

[0009] Further, the elastic member is a tube-shaped framework with a net-shaped tube wall made of an elastic silicone strip.

[0010] Further, the elastic member is a tube-shaped framework with a net-shaped tube wall made of an elastic metal wire.

[0011] Further, the self - adaptive inner - diameter catheter sheath further includes an inner membrane disposed on the inner wall of the elastic member.

[0012] Further, both ends of the elastic member are expanded and fixed in the groove, and the middle section of the elastic member remains in a free state relative to the groove.

[0013] Further, the end of the elastic member is bonded or welded to the groove wall of the groove.

[0014] Further, a hook is provided at the end of the elastic member, and the hook is embedded in the groove.

[0015] Further, the self - adaptive inner - diameter catheter sheath further includes a base, a side tube, and a valve body; one end of the tube body is connected to the base, and the other end is for extending into the patient's body; the valve body is connected to the base through the side tube.

[0016] The technical solution of the present utility model has the following advantages:

[0017] The self - adaptive inner - diameter catheter sheath provided by the present utility model is provided with an elastic member in the tube body. The inner - diameter of the channel formed by the inner ring of the elastic member is adjustable, which can adapt to medical devices with different outer diameters, reducing the number of times of replacing the catheter sheath. This not only reduces the surgical risk and operation difficulty, but also can reduce the frequent contact between the catheter sheath and the blood - vessel inner wall, reducing the risk of blood - vessel injury. Moreover, the elastic member can also reduce the friction between the medical device and the tube body, reducing the extrusion and scraping of the blood vessel during the insertion and removal of the medical device, making the surgical process smoother, reducing the operation burden of the operator, and shortening the surgical duration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the self - adaptive inner - diameter catheter sheath in the embodiment of the present utility model;

[0020] Figure 2 Schematic diagram of the partial structure of the self - adaptive inner - diameter catheter sheath in the embodiment of the present utility model;

[0021] Figure 3 Schematic diagram of the elastic member in the self - adaptive inner - diameter catheter sheath in an embodiment of the present utility model;

[0022] Figure 4Schematic diagram of the groove in the self - adapting inner - diameter catheter sheath in an embodiment of the present utility model;

[0023] Figure 5 Cross - sectional view of the self - adapting inner - diameter catheter sheath in an embodiment of the present utility model;

[0024] Figure 6 is Figure 5 Partial enlarged structural schematic diagram (the outer diameter of the medical device is smaller than the inner diameter of the channel);

[0025] Figure 7 is Figure 5 Partial enlarged structural schematic diagram (the outer diameter of the medical device is larger than the inner diameter of the channel);

[0026] Figure 8 Schematic diagram of the elastic member in the self - adapting inner - diameter catheter sheath in another embodiment of the present utility model;

[0027] Figure 9 Schematic diagram of the groove in the self - adapting inner - diameter catheter sheath in another embodiment of the present utility model;

[0028] Figure 10 Schematic diagram of the elastic member installed in the groove in the self - adapting inner - diameter catheter sheath in another embodiment of the present utility model from one perspective;

[0029] Figure 11 Schematic diagram of the elastic member installed in the groove in the self - adapting inner - diameter catheter sheath in another embodiment of the present utility model from another perspective.

[0030] Explanation of reference numerals:

[0031] 1, tube body; 2, base; 3, side tube; 4, valve body; 5, medical device; 6, elastic member; 7, groove. Detailed implementation manners

[0032] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0036] As Figure 1 shown, this embodiment provides an adaptive inner diameter catheter sheath, which includes a tube body 1, a base 2, a side tube 3, and a valve body 4. One end of the tube body 1 is connected to the base 2, and the other end is for extending into the patient's body; the valve body 4 is connected to the base 2 through the side tube 3. The above structure is similar to the existing catheter sheath structure and will not be elaborated here.

[0037] As Figure 2 shown, the difference from the catheter sheath in the prior art is that the adaptive inner diameter catheter sheath further includes an elastic member 6, which is arranged on the inner wall of the tube body 1. For example, the elastic member 6 can be a tubular structure inserted into the tube body 1, or a strip structure arranged at intervals along the circumferential direction of the inner wall of the tube body 1, or a ring structure arranged at intervals along the axial direction of the tube body 1, etc. The inner circle of the elastic member 6 forms a channel for the medical device 5 to pass through. When the outer diameter of the medical device 5 extending into the channel is greater than the inner diameter of the channel, the elastic member 6 is squeezed and deformed by the medical device 5 to increase the inner diameter of the channel. Among them, the medical device 5 in the embodiment can be a balloon dilatation catheter or a stent, etc.

[0038] The self - adaptive inner - diameter catheter sheath provided in this embodiment is provided with an elastic member 6 inside the tube body 1. The inner - diameter of the channel formed by the inner - circle of the elastic member 6 is adjustable, which can adapt to medical devices 5 with different outer - diameters, reducing the number of times of replacing the catheter sheath. This not only reduces the surgical risk and operation difficulty, but also can reduce the frequent contact between the catheter sheath and the blood - vessel inner wall, reducing the risk of blood - vessel injury. Moreover, the elastic member 6 can also reduce the friction between the medical device 5 and the tube body 1, reducing the extrusion and scraping of the blood - vessel during the insertion and removal of the medical device 5, making the surgical process smoother, reducing the operator's operation burden, and shortening the surgical duration.

[0039] As Figure 4 shown, among them, the inner wall of the tube body 1 is provided with a groove 7; the elastic member 6 is arranged in the groove 7, and when the elastic member 6 is in a natural state, the inner - diameter of the channel formed by the inner - circle of the elastic member 6 is smaller than the inner - diameter of the tube body 1. With such a setting, when the medical device 5 is inserted into the tube body 1, the elastic member 6 is extruded and undergoes radial deformation to adapt to medical devices 5 with different outer - diameters, realizing the compatibility with medical devices 5 of different specifications. Moreover, the groove 7 can also provide a stable embedding position for the elastic member 6, preventing the elastic member 6 from shifting and slipping.

[0040] Among them, the elastic member 6 is configured as a tubular skeleton with a reticular tube wall; the groove 7 is adapted to the structure of the elastic member 6, that is, the size and shape of the groove are designed to be adapted to the size and shape of the elastic member.

[0041] As Figure 3 shown, for example, the tubular skeleton with a reticular tube wall can be formed by interweaving soft elastic silicone strips, and a single soft silicone strip can be in a spiral shape. As Figure 5 , Figure 6 and Figure 7 shown, with such a setting, when a medical device 5 with a smaller outer - diameter is inserted into the tube body 1 of the catheter sheath during use, the elastic silicone strips are basically in an initial state and the deformation amount is very small; when a medical device 5 with a larger outer - diameter is inserted, the elastic silicone strips are extruded and deformed, so that the inner - diameter of the tube body 1 becomes larger, facilitating the passage of the medical device 5.

[0042] As Figure 8 , Figure 9 shown, for another example, the tubular skeleton with a reticular tube wall can also be formed by interweaving elastic metal wires. For example, when the elastic member 6 is made of elastic metal wires, an inner membrane can be provided on the inner wall of the metal skeleton formed by the elastic metal wires to reduce friction.

[0043] As Figure 10 , Figure 11As shown in the figure, when the elastic member 6 is made of elastic metal wire, both ends of the elastic member 6 can be expanded around and fixed in the groove 7, and the middle section of the elastic member 6 remains in a free state relative to the groove 7, that is, the middle section of the elastic member 6 is not fixed in the groove 7. For example, the end of the elastic member 6 can be bonded or welded to the groove wall of the groove 7. Or, for another example, a hook can be provided at the end of the elastic member 6, and the hook is embedded in the groove 7. With such a setting, in the initial state, since both ends of the elastic member 6 are fixed and the middle is not fixed, under the action of tension, the elastic member 6 has a state where the diameters at both ends are large and the diameter in the middle is small; when the medical device 5 with a small diameter is inserted into the tube body 1, the deformation amount of the elastic member 6 is not very large; when the medical device 5 with a larger outer diameter is inserted into the tube body 1, the middle section of the elastic member 6 can expand towards the direction close to the inner wall of the tube body 1.

[0044] In summary, for the self - adaptive inner - diameter catheter sheath in the present application, by providing a groove 7 in the tube body 1 and an elastic member 6 in the tube body 1, the inner diameter of the tube body 1 of the catheter sheath can be adjusted, which can adapt to medical devices 5 with different outer diameters, reduces the number of times of replacing the catheter sheath, reduces the surgical risk and operation difficulty, reduces the frequent contact between the sheath tube and the inner wall of the blood vessel, and reduces the risk of blood vessel injury.

[0045] Obviously, the above - mentioned embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. An adaptive inner diameter catheter sheath, characterized in that, At least including: A tube body (1); An elastic member (6), disposed on the inner wall of the tube body (1), an inner circle of the elastic member (6) forms a passage for a medical device (5) to pass through. When the outer diameter of the medical device (5) extending into the passage is greater than the inner diameter of the passage, the elastic member (6) is squeezed and deformed by the medical device (5) so that the inner diameter of the passage increases.

2. The self - adapting inner - diameter catheter sheath according to claim 1, wherein: A groove (7) is provided on the inner wall of the tube body (1); The elastic member (6) is disposed in the groove (7), and when the elastic member (6) is in a natural state, the inner - diameter of the passage formed by the inner circle of the elastic member (6) is smaller than the inner - diameter of the tube body (1).

3. The self - adapting inner - diameter catheter sheath according to claim 2, wherein: The elastic member (6) is configured as a tubular framework with a reticulated tube wall; The groove (7) is adapted to the structure of the elastic member (6).

4. The self - adapting inner - diameter catheter sheath according to claim 3, wherein: The elastic member (6) is a tubular framework with a reticulated tube wall made of an elastic silica gel strip.

5. The self - adapting inner - diameter catheter sheath according to claim 3, wherein: The elastic member (6) is a tubular framework with a reticulated tube wall made of an elastic metal wire.

6. The self - adapting inner - diameter catheter sheath according to claim 5, wherein: It further includes an inner membrane, disposed on the inner wall of the elastic member (6).

7. The self - adapting inner - diameter catheter sheath according to claim 5, wherein: Both ends of the elastic member (6) are stretched and fixed in the groove (7), and the middle section of the elastic member (6) remains in a free state relative to the groove (7).

8. The self - adapting inner - diameter catheter sheath according to claim 7, wherein: The end of the elastic member (6) is bonded or welded to the groove wall of the groove (7).

9. The self - adapting inner - diameter catheter sheath according to claim 7, wherein: The end of the elastic member (6) is provided with a hook, and the hook is embedded in the groove (7).

10. The self - adapting inner - diameter catheter sheath according to claim 1, wherein: It further includes a base (2), a side tube (3) and a valve body (4); One end of the tube body (1) is connected to the base (2), and the other end is for extending into a patient's body; The valve body (4) is connected to the base (2) through the side tube (3).

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