Disposable tearable catheter sheath

Abstract

The disposable tearable catheter sheath comprises a sheath tube and an expansion tube penetrating through the interior of the sheath tube, a sheath tube connector is arranged at the insertion rear end of the sheath tube, tearing marks are arranged on the two sides of the surface of the sheath tube in the axis direction, and an expansion tube connector is arranged at the insertion rear end of the expansion tube. And a sealing assembly is arranged between the sheath tube joint and the expansion tube joint. The hemostasis valve is simple in structure and reasonable in design, it is guaranteed that a doctor can tear the sheath conveniently and rapidly, a torn opening is smooth, damage to blood vessels and nerves of a patient is reduced, and the firmness of the hemostasis valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical catheters, in particular to a disposable tearable catheter sheath. Background Technique

[0002] The catheter insertion sheath is abbreviated as the catheter sheath and is also called the vascular sheath. This is a professional interventional radiology instrument that establishes an access channel from the skin to the blood vessel lumen, facilitates repeated insertion or exchange of instruments into the blood vessel, and protects the punctured blood vessel during the repeated entry and exit of the instruments into and out of the blood vessel. It consists of three parts: a (short) guide wire, a dilator, and an outer sheath tube. The tail section of the outer sheath tube is provided with a hemostatic valve and a side arm. The hemostatic valve not only prevents the blood in the blood vessel from overflowing outside the body but also prevents the gas outside the body from entering the blood vessel; the side arm is provided with a switch, which can be used to inject drugs through the side arm, flush heparin saline through the side arm to prevent blood coagulation in the gap between the outer sheath and the guide rail, and can also be used as a channel for detecting the blood vessel pressure, etc. Now, introducing a catheter, exchanging a catheter, introducing a balloon, introducing a biopsy forceps, and sending an endoprosthesis into the blood vessel all require the assistance of a catheter sheath. Generally, it is appropriate to select a catheter sheath with a diameter 0.5 - 1.0F larger than the instrument to pass through it. Since there are few special dilators available in the market now, the catheter sheath can also be used as a dilator.

[0003] For the traditional catheter sheath, the catheter needs to be completely pulled out to be removed, which may cause blood spillage or nerve injury. Generally, for the disposable tearable sheath, PTFE is used for the sheath tube and the injection molding joint is subjected to encapsulation treatment, and the gland for fixing the hemostatic valve and the injection molding joint are bonded with glue. Although PTFE has an excellent low friction coefficient, its compatibility with other polymer materials is poor. After encapsulation injection molding, the pulling force is low and it is easy to fall off. Although glue can firmly fix the hemostatic valve on the injection molding joint, glue generally easily volatilizes harmful substances and adheres to the product, which easily leads to high cytotoxicity and low biocompatibility of the product. Since PTFE also needs to be processed with a tearable incision, poor process control is likely to result in an uneven tear opening, which is easy to scratch the surrounding blood vessels or cause damage to the surrounding nerves. The hardness of the sheath tube of the ordinary disposable tearable sheath is too high or too low. If it is too high, it is easy to damage blood vessels and nerves; if it is too low, the sheath tube is easy to bend. Content of the Utility Model

[0004] The purpose of the utility model is to provide a disposable tearable catheter sheath to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A disposable tearable catheter sheath, comprising a sheath tube and a dilator tube passing through the inside of the sheath tube. A sheath tube joint is provided at the insertion rear end of the sheath tube. Tear marks are arranged on both sides of the sheath tube surface along the axial direction. A dilator tube joint is provided at the insertion rear end of the dilator tube. A sealing assembly is arranged between the sheath tube joint and the dilator tube joint;

[0006] The sealing assembly includes a hemostatic valve, a cap, and an expansion tube base lock. The hemostatic valve is arranged on one side of the sheath tube joint close to the expansion tube. The cap is arranged on one side of the hemostatic valve and connected to the outer surface of the sheath tube joint. The expansion tube base lock is arranged on the expansion tube joint for locking the cap.

[0007] Preferably, the sheath tube joint includes two semi-circular joints, and the two semi-circular joints are hermetically connected.

[0008] Preferably, the hemostatic valve is composed of two semi-circular silicone soft bodies, an insertion slit is arranged between the two semi-circular silicone soft bodies, and the cap is composed of two semi-circular caps.

[0009] Preferably, one end of the cap is threadedly connected to the internal thread arranged on one side of the expansion tube base lock by providing an external thread.

[0010] Preferably, the sheath tube is made of PEBAX.

[0011] Preferably, one side of the sheath tube joint is provided with a cavity communicating with the sheath tube.

[0012] Compared with the prior art, the beneficial effects of the present utility model are:

[0013] For the disposable tearable catheter sheath, by providing a sheath tube joint at the insertion rear end of the sheath tube, tear marks are arranged on both sides of the sheath tube surface along the axial direction, an expansion tube joint is arranged at the insertion rear end of the expansion tube, and a sealing assembly is arranged between the sheath tube joint and the expansion tube joint, which ensures that during the use by doctors, the sheath tearing is convenient and fast, the tear opening is smooth, the damage to the blood vessels and nerves of patients is reduced, and the firmness of the hemostatic valve is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the overall front view of the present utility model;

[0015] Figure 2 is the front cross-sectional view of the present utility model;

[0016] Figure 3 is the side cross-sectional view of the present utility model.

[0017] In the figure: 1. Sheath tube; 2. Expansion tube; 3. Sheath tube joint; 4. Expansion tube joint; 5. Hemostatic valve; 6. Cap; 7. Expansion tube base lock. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation to the present utility model.

[0020] In the description of this patent, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific situations.

[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "several" means two or more unless otherwise clearly and specifically defined.

[0022] Embodiment

[0023] Please refer to Figures 1-3 , a technical solution of a disposable tearable catheter sheath provided by the present utility model: including a sheath tube 1 and a dilator tube 2 passing through the inside of the sheath tube 1. The insertion end of the sheath tube 1 is connected with a sheath tube joint 3 by overmolding. Tear marks are engraved along the axial direction on both sides of the surface of the sheath tube 1. The insertion end of the dilator tube 2 is connected with a dilator tube joint 4 by overmolding. A sealing assembly is installed between the sheath tube joint 3 and the dilator tube joint 4.

[0024] The sealing assembly includes a hemostatic valve 5, a cap 6, and a dilator base lock 7. The hemostatic valve 5 is assembled on one side of the sheath tube joint 3 close to the dilator tube 2. The cap 6 is assembled on one side of the hemostatic valve 5 and connected to the outer surface of the sheath tube joint 3. The dilator base lock 7 is assembled on the dilator tube joint 4 for locking the cap 6.

[0025] The sheath tube connector 3 comprises two semicircular connectors, which are sealed and connected to each other.

[0026] The hemostatic valve 5 is composed of two semicircular silicone soft bodies, an insertion gap is formed between the two semicircular silicone soft bodies, and the cover cap 6 is composed of two semicircular caps.

[0027] One end of the cover cap 6 is threadedly connected with the internal thread on one side of the expansion tube base lock 7 by providing an external thread.

[0028] The sheath tube 1 is made of PEBAX, and the injection molding overmolding material is PA material, which ensures the compatibility of the two. The sheath tube 1 and the injection molding material can be well bonded together after molding, thereby improving the excellent tensile performance and preventing the sheath tube from falling off.

[0029] A cavity communicated with the sheath tube 1 is provided on one side of the sheath tube connector 3 , so as to facilitate extraction of accumulated fluid through the sheath tube 1 or injection of liquid medicine through the sheath tube 1 .

[0030] In the present device, during preparation, the expansion tube 2 and the sheath tube 1 are first extruded, the expansion tube 2 and the expansion tube joint 4 are injection molded together by rubber coating, the sheath tube 1 and the sheath tube joint 3 are injection molded together by rubber coating, the liquid silicone hemostatic valve 5 is injection molded, the hemostatic valve 5 is cut into the required structure, the expansion tube base lock 7 is injection molded, the expansion tube base lock 7 and the expansion tube 2 and the expansion tube joint 4 are assembled together, the hemostatic valve 5, the cap 6, the sheath tube 1, and the sheath tube joint 3 are assembled together, and the assembly parts are assembled together. When the sheath tube 1 needs to be removed, it is only necessary to rotate the expansion tube joint 4 to separate the expansion tube base lock 7 from the cap 6, and then pinch the two handle parts of the sheath tube joint 3 and pry them apart outwards, so as to tear the sheath tube 1 apart. The present device ensures that the doctor can tear the sheath quickly and conveniently during use, and the tearing mouth is smooth, thereby reducing damage to the patient's blood vessels and nerves and ensuring the firmness of the hemostatic valve.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A disposable tearable catheter sheath, comprising a sheath tube (1) and a dilation tube (2) passing through the interior of the sheath tube (1), characterized in that: The insertion rear end of the sheath tube (1) is provided with a sheath tube joint (3), both sides of the surface of the sheath tube (1) are provided with tear marks along the axial direction, the insertion rear end of the expansion tube (2) is provided with an expansion tube joint (4), and a sealing component is provided between the sheath tube joint (3) and the expansion tube joint (4); The sealing assembly comprises a hemostatic valve (5), a cover cap (6) and an expansion tube base lock (7); the hemostatic valve (5) is arranged on a side of the sheath tube connector (3) close to the expansion tube (2); the cover cap (6) is arranged on one side of the hemostatic valve (5) and connected to the outer surface of the sheath tube connector (3); and the expansion tube base lock (7) is arranged on the expansion tube connector (4) for locking the cover cap (6).

2. The disposable tearable catheter sheath according to claim 1, characterized in that: The sheath tube joint (3) comprises two semicircular joints, and the two semicircular joints are sealedly connected.

3. The disposable tearable catheter sheath according to claim 1, characterized in that: The hemostatic valve (5) is composed of two semicircular silicone soft bodies, an insertion seam is provided between the two semicircular silicone soft bodies, and the cover cap (6) is composed of two semicircular caps.

4. The disposable tearable catheter sheath according to claim 1, characterized in that: One end of the cover cap (6) is threadably connected to an internal thread provided on one side of the expansion tube base lock (7) by providing an external thread.

5. The disposable tearable catheter sheath according to claim 1, characterized in that: The sheath tube (1) is made of PEBAX.

6. The disposable tearable catheter sheath according to claim 1, characterized in that: One side of the sheath tube connector (3) is provided with a cavity which is in communication with the sheath tube (1).

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