Layered puncture dilation sheath with hydrophilic coating with hemostatic valve

Abstract

This utility model relates to the field of medical devices and discloses a layered puncture dilation sheath with a hydrophilic coating and a hemostatic valve. It includes a sheath body and a handle. Four through-holes are formed on both sides of the front end of the outer wall of the sheath. Each of the eight through-holes contains an dilation mechanism, and each of the eight dilation mechanisms includes an arc plate. A push-pull rod is hinged to the center of opposite sides of each pair of opposing arc plates. The handle includes a fixed base. Sliding grooves are formed on both sides of the rear end of the outer wall of the fixed base. An annular top block is slidably disposed inside the fixed base. An annular sleeve is rotatably disposed at the center of the rear end face of the annular top block, and an inner tube is fixedly disposed at the center of the front end face of the annular sleeve. This utility model can achieve the effect of layered dilation of the wound in one operation and avoids the waste caused by replacing the entire dilation sheath when the hemostatic valve is damaged.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve. Background Technology

[0002] A puncture dilator sheath is a device that can meet the needs of vascular interventional dilation in a single procedure. It can be used to dilate puncture channels in the skin, subcutaneous tissue, and blood vessel walls to facilitate the insertion of interventional devices. In percutaneous endovascular repair of the thoracic aorta, endovascular repair of abdominal aortic aneurysms, transcatheter aortic valve implantation, and ECMO implantation, a puncture dilator can be used to pre-dilate the puncture channel before inserting the stent delivery device. This minimally invasive interventional technique avoids incisions, exposure of the femoral artery, and the need for sutures, playing a crucial role in reducing puncture complications.

[0003] In the process of developing this application, the inventors discovered the following problems with the prior art:

[0004] In existing technologies, expanders are usually separate devices. During use, the wound needs to be expanded multiple times using expander sheaths of different sizes, which increases the probability of vascular damage to the patient. In addition, in existing technologies, the hemostatic valve is usually fixed only at the rear end of the sheath. When the expander sheath passes through the guidewire and causes the guidewire to puncture the hemostatic valve, affecting the hemostatic effect, the entire expander sheath usually needs to be replaced, which is quite wasteful.

[0005] Therefore, those skilled in the art have provided a layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve. This sheath can achieve the effect of gradually dilating the wound in one go and can prevent the waste caused by replacing the entire dilation sheath when the hemostatic valve is damaged.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve includes a sheath body and a handle. The outer wall of the sheath body has four through slots on both sides of the front end. Each of the eight through slots is provided with an expansion mechanism. Each of the eight expansion mechanisms includes an arc plate. A push-pull rod is hinged to the center of opposite sides of each pair of arc plates. The handle includes a fixed base. The outer wall of the fixed base has sliding grooves on both sides of the rear end. An annular top block is slidably disposed inside the fixed base.

[0009] An annular sleeve is rotatably mounted at the center of the rear end face of the annular top block. An inner tube is fixedly mounted at the center of the front end face of the annular sleeve. Slider blocks are fixedly mounted on both sides of the front end of the inner wall of the annular sleeve. A threaded rear seat is threadedly mounted on the rear end of the outer wall of the annular sleeve. A hemostatic valve mechanism is mounted inside the threaded rear seat. The hemostatic valve mechanism includes a threaded tube. A silicone one-way valve is movably mounted at the front end of the threaded tube. A dust cover is movably mounted at the rear end of the threaded tube.

[0010] Furthermore, a spring is fixedly installed at the center of the front end face of the inner wall of the fixed base, and the rear end of the spring is fixedly connected to the front end of the annular top block.

[0011] Furthermore, the front end of the annular sleeve is movably sleeved on the rear end of the outer wall of the fixed base, and the two sliders are respectively slidably disposed inside the two grooves.

[0012] Furthermore, the silicone single-way valve is slidably embedded inside the threaded rear seat, and the threaded pipe is threadedly embedded in the inner wall of the threaded rear seat.

[0013] Furthermore, protrusions are fixedly provided on both sides of the rear end face of the threaded tube, and grooves are provided on both sides of the rear end face of the inner wall of the dust cover, with the two protrusions respectively embedded in the two grooves.

[0014] Furthermore, the inner tube is slidably disposed inside the sheath body, and all eight push-pull rods are hinged to the outer wall of the inner tube. Among the eight push-pull rods, the length of each pair of push-pull rods located on the same horizontal line on both sides increases progressively from front to back.

[0015] Furthermore, an expansion membrane is fixedly installed at the front end of the outer wall of the sheath at the outer side of each of the eight perforation slots, and a flushing valve is embedded at the center of the lower end of the outer wall of the annular sleeve.

[0016] Furthermore, the inner wall of the sheath is made of tetrafluoroethylene, the outer wall of the sheath is made of hydrophilic block polyamide, the central interlayer of the sheath is made of stainless steel wire mesh, and the sheath is a hollow cone.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model proposes a layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve. Pushing the annular sleeve forward causes the annular top block to compress the spring, keeping it in a compressed state. At the same time, the annular top block and the annular sleeve can move the inner tube to the front end, thereby changing the angle of the push-pull rod so that it is perpendicular to the arc plate. Then, by changing the angle of the push-pull rod, the arc plate is pushed to the side away from the inner wall of the sheath, which in turn causes the dilation membrane to expand. Then, rotating the annular sleeve, the special shape of the sliding groove, combined with the elasticity of the spring, locks and fixes the position of the slider, thereby preventing the annular sleeve from sliding backward. In this way, the wound can be dilated layer by layer in one go.

[0019] 2. This utility model proposes a layered puncture dilation sheath with a hydrophilic coating and a hemostatic valve. By sliding the dust cover backward to remove it, a guidewire can be inserted through the inner tube into the sheath. Simultaneously, a silicone single-way valve prevents excessive blood loss from the patient. If the guidewire breaks while passing through the silicone single-way valve, the dust cover and threaded tube are connected by protrusions and grooves. Rotating the dust cover causes the threaded tube to rotate, disengaging it from the threaded seat, thus enabling the separate removal of the silicone single-way valve. This prevents accidental dislodgement of the silicone single-way valve due to direct threading or interference fit, and avoids the need to replace the entire dilation sheath if the silicone single-way valve breaks. Attached Figure Description

[0020] Figure 1 This is an overall isometric schematic diagram of the present invention;

[0021] Figure 2 This is a schematic side sectional view of the present invention;

[0022] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a side sectional view of the handle of this utility model;

[0024] Figure 5 This is a schematic diagram of the fixed base and annular sleeve assembly of this utility model;

[0025] Figure 6 This is a schematic diagram of the hemostatic valve mechanism assembly of this utility model.

[0026] Legend:

[0027] 1. Sheath; 2. Expansion membrane; 3. Handle; 4. Flushing valve; 5. Inner tube; 6. Expansion mechanism; 7. Through groove; 8. Hemostatic valve mechanism; 9. Spring; 10. Slide groove; 11. Slider; 301. Fixed base; 302. Annular top block; 303. Annular sleeve; 304. Threaded back seat; 601. Arc plate; 602. Push-pull rod; 801. Threaded tube; 802. Dust cover; 803. Silicone one-way valve. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Reference Figures 1 to 6 One embodiment provided by this utility model:

[0030] A layered puncture dilation sheath with a hydrophilic coating and a hemostatic valve includes a sheath body 1 and a handle 3. The outer wall of the sheath body 1 has four through slots 7 on both sides of the front end. Each of the eight through slots 7 is provided with an expansion mechanism 6. Each of the eight expansion mechanisms 6 includes an arc plate 601. Each pair of opposite arc plates 601 has a push-pull rod 602 hinged at the center of opposite sides. The handle 3 includes a fixed base 301. The outer wall of the fixed base 301 has sliding grooves 10 on both sides of the rear end. An annular top block 302 is slidably provided inside the fixed base 301.

[0031] An annular sleeve 303 is rotatably mounted at the center of the rear end face of the annular top block 302. An inner tube 5 is fixedly mounted at the center of the front end face of the annular sleeve 303. Slider blocks 11 are fixedly mounted on both sides of the front end of the inner wall of the annular sleeve 303. A threaded back seat 304 is threaded at the rear end of the outer wall of the annular sleeve 303. A hemostatic valve mechanism 8 is mounted inside the threaded back seat 304. The hemostatic valve mechanism 8 includes a threaded tube 801. A silicone one-way valve 803 is movably mounted at the front end of the threaded tube 801. A dust cover 802 is movably mounted at the rear end of the threaded tube 801.

[0032] Specifically, pushing the annular sleeve 303 forward causes the annular top block 302 to move, which in turn moves the inner rod. This allows the rotation angle of the eight push-pull rods 602 to gradually become perpendicular to the eight arc plates 601, thereby pushing the eight arc plates 601 to move outward from the sheath 1. This causes the expansion membrane 2 to expand, thus increasing the diameter of the outer wall of the sheath 1 at the expansion membrane 2. When the silicone single-way valve 803 is damaged, it can be removed by rotating the threaded tube 801 through the dust cover 802. This achieves the effective fixation and disassembly / replacement of the silicone single-way valve 803.

[0033] Reference Figure 2 , Figure 4 A spring 9 is fixedly installed at the center of the front end face of the inner wall of the fixed base 301, and the rear end of the spring 9 is fixedly connected to the front end of the annular top block 302.

[0034] Specifically, when the annular top block 302 moves forward, it compresses the spring 9, and then in the relaxed state, the spring 9 supports the annular top block 302 so that it can drive the inner tube 5 to move backward.

[0035] Reference Figure 2 , Figure 4 The annular sleeve 303 is movably sleeved at the rear end of the outer wall of the fixed base 301, and the two sliders 11 are respectively slidably disposed inside the two slide grooves 10.

[0036] Specifically, by embedding the slider 11 inside the slide groove 10 and rotating the annular sleeve 303, the special structure of the slide groove 10, combined with the pushing force of the spring 9 on the annular sleeve 303, can achieve the effect of fixing the position of the slider 11.

[0037] Reference Figure 2 , Figure 4 The silicone one-way valve 803 is slidably embedded inside the threaded back seat 304, and the threaded tube 801 is threadedly embedded in the inner wall of the threaded back seat 304.

[0038] Specifically, the silicone one-way valve 803 is first embedded inside the threaded back seat 304, and then the threaded tube 801 is rotated to embed it inside the threaded back seat 304 and make it contact the rear end of the silicone one-way valve 803, thereby restricting the position of the silicone one-way valve 803 to achieve the effect of fixing and disassembling the silicone one-way valve 803.

[0039] Reference Figure 6 Both sides of the rear end face of the threaded pipe 801 are fixedly provided with protrusions, and both sides of the rear end face of the inner wall of the dust cover 802 are provided with grooves, with two protrusions respectively embedded in the two grooves.

[0040] Specifically, by inserting the protrusion into the groove, rotating the dust cover 802 can drive the threaded tube 801 to rotate. When the dust cover 802 is removed, the guide wire path can be exposed, and at this time the threaded tube 801 is fully embedded in the threaded seat 304. Therefore, it will not easily fall off due to accidental contact, and can play a stable fixing role for the silicone single-way valve 803.

[0041] Reference Figure 2 , Figure 3 The inner tube 5 is slidably disposed inside the sheath 1. All eight push-pull rods 602 are hinged to the outer wall of the inner tube 5. The length of each pair of push-pull rods 602 located on the same horizontal line on both sides increases from front to back.

[0042] Specifically, pushing the inner tube 5 can change the vertical distance between the two ends of the push-pull rod 602, thereby enabling the push-pull rod 602 to push the arc plate 601 to move, thus achieving the effect of gradually expanding the wound.

[0043] Reference Figure 1 , Figure 2 , Figure 3 An expansion membrane 2 is fixedly installed at the front end of the outer wall of the sheath 1, located outside the eight through slots 7. A flushing valve 4 is embedded at the center of the lower end of the outer wall of the annular sleeve 303.

[0044] Specifically, the expansion membrane 2 protects the surface of the arc plate 601 to prevent the arc plate 601 from scratching the patient and causing discomfort, and the flushing valve 4 can flush the inside of the inner tube 5.

[0045] Reference Figure 2 , Figure 3 , Figure 4 The inner wall of the sheath 1 is made of tetrafluoroethylene material, the outer wall of the sheath 1 is made of hydrophilic block polyamide material, the central interlayer of the sheath 1 is made of stainless steel wire mesh material, and the sheath 1 is a hollow cone.

[0046] Specifically, the inner wall of the sheath 1 is made of tetrafluoroethylene material to prevent the inner wall of the sheath 1 from sticking together, and the overall strength of the sheath 1 is improved by the central interlayer of stainless steel wire mesh material. At the same time, the hydrophilic block polyamide of the outer wall of the sheath 1 can be used to reduce the frictional resistance during the insertion process of the sheath 1.

[0047] Working principle: Moving the annular sleeve 303 forward causes the annular top block 302 to compress the spring 9, causing it to contract. Rotating the annular sleeve 303 locks its front and rear positions through the slider 11 and the groove 10. At this time, the inner tube 5 moves forward and drives the push-pull rod 602 to rotate, thereby extending the vertical distance between its two ends. This, in turn, pushes the arc plate 601 to move outward, achieving an expansion effect. Then, sliding the dust cover 802 backward and removing it exposes the guide wire channel. When the inserted guide wire pierces the silicone single-way valve 803, the dust cover 802 is fitted with the threaded tube 801 so that the protrusion is embedded in the groove. Then, rotating the dust cover 802 drives the threaded tube 801 to rotate, and then removing the threaded tube 801. At this point, the silicone single-way valve 803 can be disassembled and replaced, avoiding the waste caused by replacing the entire expansion sheath.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve, comprising a sheath body (1) and a handle (3), characterized in that: The sheath (1) has four through slots (7) on both sides of the front end of its outer wall. Each of the eight through slots (7) is equipped with an expansion mechanism (6). Each of the eight expansion mechanisms (6) includes an arc plate (601). Each of the eight arc plates (601) has a push-pull rod (602) hinged at the center of the opposite side of each pair of opposite arc plates (601). The handle (3) includes a fixed base (301). Each of the two sides of the rear end of the fixed base (301) has a sliding groove (10). An annular top block (302) is slidably arranged inside the fixed base (301). An annular sleeve (303) is rotatably provided at the center of the rear end face of the annular top block (302). An inner tube (5) is fixedly provided at the center of the front end face of the annular sleeve (303). Slider blocks (11) are fixedly provided on both sides of the front end of the inner wall of the annular sleeve (303). A threaded seat (304) is threaded at the rear end of the outer wall of the annular sleeve (303). A hemostatic valve mechanism (8) is provided inside the threaded seat (304). The hemostatic valve mechanism (8) includes a threaded tube (801). A silicone one-way valve (803) is movably provided at the front end of the threaded tube (801). A dust cover (802) is movably provided at the rear end of the threaded tube (801).

2. The layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve according to claim 1, characterized in that: A spring (9) is fixedly installed at the center of the front end face of the inner wall of the fixed base (301), and the rear end of the spring (9) is fixedly connected to the front end of the annular top block (302).

3. The layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve according to claim 1, characterized in that: The front end of the annular sleeve (303) is movably sleeved on the rear end of the outer wall of the fixed base (301), and the two sliders (11) are respectively slidably disposed inside the two grooves (10).

4. The layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve according to claim 1, characterized in that: The silicone single-way valve (803) is slidably embedded inside the threaded back seat (304), and the threaded tube (801) is threadedly embedded in the inner wall of the threaded back seat (304).

5. The layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve according to claim 1, characterized in that: Both sides of the rear end face of the threaded tube (801) are fixedly provided with protrusions, and both sides of the rear end face of the inner wall of the dust cover (802) are provided with grooves, and the two protrusions are respectively embedded in the two grooves.

6. The layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve according to claim 1, characterized in that: The inner tube (5) is slidably disposed inside the sheath (1), and all eight push-pull rods (602) are hinged to the outer wall of the inner tube (5). The length of each pair of push-pull rods (602) located on the same horizontal line on both sides increases from front to back.

7. A layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve according to claim 1, characterized in that: An expansion membrane (2) is fixedly installed at the front end of the outer wall of the sheath (1) at the outer side of the eight through slots (7), and a flushing valve (4) is embedded at the center of the lower end of the outer wall of the annular sleeve (303).

8. A layer-by-layer puncture dilation sheath with a hydrophilic coating and a hemostatic valve according to claim 1, characterized in that: The inner wall of the sheath (1) is made of tetrafluoroethylene material, the outer wall of the sheath (1) is made of hydrophilic block polyamide material, the central interlayer of the sheath (1) is made of stainless steel wire mesh material, and the sheath (1) is a hollow cone.

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