Detachable catheter sheath with hemostasis valve

Abstract

The utility model relates to a detachable catheter sheath with a hemostasis valve, which belongs to the field of medical instruments and comprises a dilator, a detachable joint with a hemostasis valve and a catheter sheath, the catheter sheath is connected onto the detachable joint with the hemostasis valve, the dilator comprises a dilator joint and a dilator tube body, and the dilator joint is connected with the dilator tube body. The dilator tube body is arranged in the detachable joint with the hemostasis valve and the catheter sheath, the detachable joint with the hemostasis valve comprises a hemostasis valve shell and a Luer taper connected with the hemostasis valve shell, and a first extension tube and a second extension tube which are communicated with the inside of the hemostasis valve shell are arranged on the side wall of the hemostasis valve shell. A two-way valve is arranged on the first extension tube, a three-way valve is arranged on the second extension tube, a first hemostasis valve and a second hemostasis valve are arranged in the hemostasis valve shell, a sealing bag is arranged between the first hemostasis valve and the second hemostasis valve, and an end cover is arranged at the end, away from the Luer connector, of the hemostasis valve shell.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a detachable catheter sheath with a hemostatic valve. Background Art

[0002] The catheter sheath is an auxiliary guiding device for arteriovenous interventional surgery and plays an important role in interventional treatment.

[0003] At present, common catheter sheaths are used for catheterization using the Sedinger puncture method, and its main steps include: first disinfecting the puncture site and giving local anesthesia, then using a puncture needle to puncture the artery, and seeing blood return indicates that the puncture is successful; then inserting a guide wire into the puncture needle to ensure that the guide wire extends into the blood vessel; then withdrawing the puncture needle and enlarging the puncture point with a scalpel; then inserting the dilator / catheter sheath assembly along the guide wire, and pushing the dilator / catheter sheath assembly into the artery along the guide wire; then withdrawing the guide wire and dilator, and sending the catheter from the catheter sheath into the artery; finally, fixing the catheter by wrapping it with gauze or a bandage.

[0004] However, the catheter sheath used in the prior art still has at least the following problems:

[0005] (1) The hemostatic valve in the traditional catheter sheath is composed of a rubber elastic body with a cross incision on the rubber elastic body. The puncture needle can pass through the hemostatic valve smoothly and has a good sealing effect. However, when the main intervention catheter is used to pass through the cross incision on the rubber elastic body, not only the overall sealing cannot be guaranteed, but also because the catheter itself is made of soft material, when it is forced through the cross incision under the action of external force, it is easy to cause the catheter to bend or even fail to pass through the cross incision smoothly. In addition, the single-piece hemostatic valve design has poor coaxiality with the sheath.

[0006] (2) The catheter sheath provides a channel for the catheter device to enter the human body, and also creates an outlet for blood to flow out. In order to prevent blood loss, it is usually necessary to set a sealing hemostatic valve in the catheter sheath. The problem with the existing technical solutions is that there is a contradiction between the sealing function of the hemostatic valve and the penetrable function that facilitates the passage of interventional instruments. In order to prevent blood from flowing out, it is often necessary to improve the sealing performance, but this will correspondingly affect the penetrability of the interventional instrument in the hemostatic valve. In addition, with the existing technology, bleeding often occurs during surgery.

[0007] Existing catheter sheaths are basically designed with a hemostatic valve and a sheath tube as an integral part and cannot be disassembled. It is inconvenient to transport instruments during surgery because they all have to pass through the hemostatic valve, especially for long sheaths. Sometimes the surgeon uses it as a guide catheter, and the presence of the hemostatic valve makes it inconvenient to use, which affects the applicability of the catheter sheath. Utility Model Content

[0008] In order to overcome the above-mentioned defects of the prior art, the utility model provides a detachable catheter sheath with a hemostatic valve to solve the problems raised in the background technology.

[0009] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a detachable catheter sheath with a hemostatic valve, comprising a dilator, a detachable connector with a hemostatic valve and a catheter sheath, the catheter sheath being connected to the detachable connector with a hemostatic valve, the dilator comprising a dilator connector and a dilator tube body, the dilator tube body being arranged inside the detachable connector with a hemostatic valve and the catheter sheath, the detachable connector with a hemostatic valve comprising a hemostatic valve housing and a Luer connector connected to the hemostatic valve housing, a first extension tube and a second extension tube being connected to the interior of the hemostatic valve housing being provided on the side wall of the hemostatic valve housing, a two-way valve being provided on the first extension tube, a three-way valve being provided on the second extension tube, a first hemostatic valve and a second hemostatic valve being provided inside the hemostatic valve housing, a sealing bag being provided between the first hemostatic valve and the second hemostatic valve, and an end cover being provided at the end of the hemostatic valve housing away from the Luer connector.

[0010] Furthermore, the catheter sheath includes a catheter sheath connector, and the catheter sheath connector is cooperatively connected with the Luer connector.

[0011] Furthermore, the catheter sheath also includes a stress relief tube and a sheath body, a developing ring is provided inside the sheath body, the stress relief tube is sleeved on the sheath body, the sheath body includes a sheath body inner layer, a sheath body middle layer, and a sheath body outer layer, and the sheath body middle layer is arranged between the sheath body inner layer and the sheath body outer layer.

[0012] Furthermore, the catheter sheath connector is made of a medical polymer material and is integrally injection molded with the sheath tube body.

[0013] Furthermore, the material of the inner layer of the sheath body is PTFE, the material of the middle layer of the sheath body is 304 stainless steel, and the material of the outer layer of the sheath body is pebax and / or polyurethane polymer material.

[0014] Furthermore, the stress relief tube is made of TPU or polyolefin polymer material and is arranged on the sheath tube body by heat shrinking.

[0015] Furthermore, the hemostatic valve housing is made of PA, PC or nylon injection molding.

[0016] Furthermore, the end cover is injection-molded from PA, PC or nylon material, and the end cover is threadedly connected to the hemostatic valve housing.

[0017] Furthermore, the two-way valve is made of PA or PC or nylon polymer material injection molding.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The double hemostatic valve design of the first hemostatic valve and the second hemostatic valve combined with the sealing bag design provides a more reliable seal, avoids blood leakage, and improves the coaxiality between the instrument and the sheath.

[0020] The hemostatic valve connector is detachable and easy to operate and use, so that the catheter sheath has the functions of a sheath and some functions of a catheter. For example, the long sheath can be used as a guide catheter or a thrombus aspiration catheter, which increases the practicality of the catheter sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the expander according to an embodiment of the utility model;

[0023] Figure 3 It is a cross-sectional enlarged structural schematic diagram of the detachable connector with hemostatic valve of the utility model;

[0024] Figure 4 This is a schematic diagram of the catheter sheath structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described in conjunction with the drawings of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The embodiment of the utility model is described below in conjunction with the drawings.

[0026] like Figures 1 to 4 As shown, the detachable catheter sheath with hemostatic valve comprises a dilator 1, a detachable connector with hemostatic valve 2 and a catheter sheath 3, the catheter sheath 3 is connected to the detachable connector with hemostatic valve 2, the dilator 1 comprises a dilator connector 4 and a dilator tube body 5, the dilator tube body 5 is arranged inside the detachable connector with hemostatic valve 2 and the catheter sheath 3, the detachable connector with hemostatic valve 2 comprises a hemostatic valve housing 7 and a Luer connector 6 connected to the hemostatic valve housing 7, a first extension tube 13 and a second extension tube 14 connected to the inside of the hemostatic valve housing 7 are arranged on the side wall of the hemostatic valve housing 7, a two-way valve 12 is arranged on the first extension tube 13, a three-way valve 15 is arranged on the second extension tube 14, a first hemostatic valve 8 and a second hemostatic valve 10 are arranged inside the hemostatic valve housing 7, a sealing bag 9 is arranged between the first hemostatic valve 8 and the second hemostatic valve 10, and an end cap 11 is arranged at the end of the hemostatic valve housing 7 away from the Luer connector 6;

[0027] The first hemostatic valve 8, the second hemostatic valve 10, and the sealing bag 9 are used together to fix the dilator 1 or the guide wire and other passing instruments, and prevent blood from overflowing or leaking. The hemostatic valve housing 7 and the end cover 11 are threadedly connected to fix the hemostatic valve and the sealing bag 9; the Luer connector 6 is detachably connected to the catheter sheath 3, the first extension tube 13 is connected to the two-way valve 12 to control the filling of the sealing bag 9, and the second extension tube 14 is connected to the three-way valve. The sheath is flushed through the transverse connection, and blood samples can be drawn, pressure is monitored, and vasodilators or contrast agents are injected during the operation;

[0028] The dilator 1 is designed as a common catheter sheath 3 matching the dilator 1, and is composed of a dilator connector 4 and a dilator body 5. The head of the dilator body 5 is gradually tapered to dilate the passage from the skin to the blood vessel wall so as to subsequently insert the catheter. The front end of the dilator connector 4 is designed with a buckle to ensure that the dilator 1 and the detachable connector with hemostatic valve 2 are firmly connected;

[0029] The material of the two-way valve 12 is PA or PC or nylon polymer material, injection molding, and the conventional medical two-way valve 12 is connected to the first extension tube 13, connected to the sealing bag 9, and externally connected to the injection device to fill the sealing bag 9 with liquid; wherein, during the operation, when the liquid filling is completed, the switch is closed to maintain the liquid filling state, and after the operation is completed, the switch is opened to release the liquid;

[0030] The sealing capsule 9 is made of elastic rubber material and is in the shape of a ring. The inside is very thin and folded together. After being filled with liquid, its shape changes with the liquid state, and it can even enter small irregular holes for blocking. It has good sealing performance and can effectively prevent blood leakage. There is an interface on the outside, which is connected to the first extension tube 13. The step design is combined with the bonding process to ensure that the two connections are tight;

[0031] The first hemostatic valve 8 and the second hemostatic valve 10 are commonly used hemostatic valves for the catheter sheath 3, and are made of silicone rubber with a "cross-shaped" slit in the middle, through which the dilator 1 and the guide wire can be inserted. The silicone sheet has good elasticity and adheres to the dilator 1 or the guide wire after rebounding, ensuring that blood is not easily leaked. At the same time, the double hemostatic valve ensures that the dilator 1 is coaxial with the catheter sheath 3;

[0032] The material of the Luer connector 6 is a polymer material such as PA or PC, injection molded, connected to the hemostatic valve housing 7 by assembly, with a 6% Luer outer cone connector, connected to the catheter sheath connector 16;

[0033] The catheter sheath 3 includes a catheter sheath connector 16, which is cooperatively connected with the Luer connector 6;

[0034] The catheter sheath connector 16 is made of medical polymer material, has a 6% Luer inner cone connector, and is integrally injection molded with the sheath body;

[0035] The catheter sheath 3 also includes a stress relief tube 17 and a sheath body. A developing ring 21 is provided inside the sheath body. The material of the developing ring 21 is a platinum-iridium alloy, gold, tantalum ring or other developing materials. The stress relief tube 17 is sleeved on the sheath body. The sheath body includes a sheath body inner layer 18, a sheath body middle layer 19, and a sheath body outer layer 20. The sheath body middle layer 19 is provided between the sheath body inner layer 18 and the sheath body outer layer 20.

[0036] The material of the inner layer 18 of the sheath body is PTFE, the material of the middle layer 19 of the sheath body is 304 stainless steel, a steel mesh woven or wound into a spring, and the material of the outer layer 20 of the sheath body is pebax and / or polyurethane polymer material;

[0037] The stress relief tube 17 is made of TPU or polyolefin polymer material and is arranged on the sheath tube in the form of heat shrinkage;

[0038] The material of the dilator tube body 5 is pebax medical polymer material, which is extruded and formed. The head of the dilator tube body 5 gradually tapers and fits closely with the head end of the catheter sheath 3. The tapered head end is made by a tip molding process.

[0039] The hemostatic valve housing 7 is made of PA or PC or nylon injection molding material, and is connected to the end cover 11 by threads. The first hemostatic valve 8, the second hemostatic valve 10, and the sealing bag 9 are installed inside, and the outside is connected to the first extension tube 13 and the second extension tube 14;

[0040] The end cap 11 is made of PA, PC or nylon injection molding material, and the end cap 11 is threadedly connected to the hemostatic valve housing 7 to fix the hemostatic valve;

[0041] The material of the two-way valve 12 is PA or PC or nylon polymer material injection molding;

[0042] The first hemostatic valve 8 and the second hemostatic valve 10 are designed with the sealing capsule 9. The double hemostatic valves can be used to prevent blood leakage and ensure the coaxiality between the instrument and the sheath. In addition, after the sealing capsule 9 is filled with liquid, it tightly seals the instrument, which not only fixes the instrument but also compensates for the leakage caused by the hemostatic valve plugging. The plugging is firm and the operation is simple. After the instrument passes through, liquid is injected into the sealing capsule 9, and then the two-way valve 12 is locked to keep the sealing capsule 9 full. When the instrument needs to be withdrawn, the two-way valve 12 is opened to let the liquid flow out.

[0043] The detachable connector 2 with hemostatic valve is detachable, which is convenient for the operator to use. It can be installed when needed and removed when not needed. In addition, the detachable design also increases the practicality of the catheter sheath 3, which can also be used as a catheter, especially the long sheath, so that it also has the function of a guide catheter or a thrombus aspiration catheter.

[0044] The above describes the technical solution of the utility model in combination with specific implementation methods, but it should be noted that the above descriptions are only for explaining the solution of the utility model and cannot be interpreted as a specific limitation on the protection scope of the utility model in any way. Based on the explanation here, technicians in this field can think of other specific implementation methods or equivalent replacements of the utility model without creative work, which will fall within the protection scope of the utility model.

Claims

1. A detachable catheter sheath with a hemostatic valve, characterized in that: It includes a dilator, a detachable joint with a hemostatic valve and a catheter sheath, the catheter sheath is connected to the detachable joint with a hemostatic valve, the dilator includes a dilator joint and a dilator tube body, the dilator tube body is arranged inside the detachable joint with a hemostatic valve and the catheter sheath, the detachable joint with a hemostatic valve includes a hemostatic valve housing and a Luer joint connected to the hemostatic valve housing, a first extension tube and a second extension tube connected to the interior of the hemostatic valve housing are provided on the side wall of the hemostatic valve housing, a two-way valve is provided on the first extension tube, a three-way valve is provided on the second extension tube, a first hemostatic valve and a second hemostatic valve are provided inside the hemostatic valve housing, a sealing bag is provided between the first hemostatic valve and the second hemostatic valve, and an end cover is provided at the end of the hemostatic valve housing away from the Luer joint.

2. The detachable catheter sheath with hemostatic valve according to claim 1, characterized in that: The catheter sheath comprises a catheter sheath connector, and the catheter sheath connector is cooperatively connected with the Luer connector.

3. The detachable catheter sheath with hemostatic valve according to claim 2, characterized in that: The catheter sheath also includes a stress relief tube and a sheath body. A developing ring is provided inside the sheath body. The stress relief tube is sleeved on the sheath body. The sheath body includes a sheath body inner layer, a sheath body middle layer, and a sheath body outer layer. The sheath body middle layer is arranged between the sheath body inner layer and the sheath body outer layer.

4. The detachable catheter sheath with hemostatic valve according to claim 3, characterized in that: The catheter sheath connector is made of medical polymer material and is integrally injection molded with the sheath tube body.

5. The detachable catheter sheath with hemostatic valve according to claim 4, characterized in that: The material of the inner layer of the sheath body is PTFE, the material of the middle layer of the sheath body is 304 stainless steel, and the material of the outer layer of the sheath body is pebax or polyurethane polymer material.

6. The detachable catheter sheath with hemostatic valve according to claim 4, characterized in that: The stress relief tube is made of TPU or polyolefin polymer material and is arranged on the sheath tube body in the form of heat shrinkage.

7. The detachable catheter sheath with hemostatic valve according to claim 1, characterized in that: The hemostatic valve housing is made of PA, PC or nylon injection molding.

8. The detachable catheter sheath with hemostatic valve according to claim 1, characterized in that: The end cap is made of PA, PC or nylon material by injection molding, and the end cap is threadedly connected to the hemostatic valve housing.

9. The detachable catheter sheath with hemostatic valve according to claim 1, characterized in that: The two-way valve is made of PA or PC or nylon polymer material injection molding.

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