Sheath tube with adjustable tube diameter

Abstract

The sheathing canal with the adjustable pipe diameter comprises a catheter sheath, a connecting pipe and a blood vessel sheath which are sequentially connected to form a channel, the blood vessel sheath comprises a valve body and an adjusting device, the valve body comprises an annular pipe made of an elastic material and a circular truncated cone pipe made of a rigid material, the annular pipe is composed of a plurality of tubular units, and protruding sliding rails are arranged on the tubular units; the circular truncated cone pipe is provided with a sliding groove in the direction of the sliding rail, a connecting ring used for being connected with the sliding rail is arranged between the annular pipe and the circular truncated cone pipe, the connecting ring is an unclosed circular ring, the adjusting device is connected with the connecting ring and penetrates through the sliding groove, and the adjusting device can slide in the direction of the sliding groove. The valve body comprises the annular pipe and the circular truncated cone pipe, the unclosed connecting ring is arranged between the annular pipe and the circular truncated cone pipe, the sliding groove is formed in the circular truncated cone pipe, and the adjusting device is connected with the connecting ring and penetrates through the sliding groove, so that the adjusting device can slide in the direction of the sliding groove, the connecting ring is driven to slide, and finally the pipe diameter of the annular pipe is changed.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a sheath with adjustable diameter. Background Technology

[0002] With advancements in technology, materials, and screening strategies, mechanical thrombectomy has become a common treatment for acute ischemic stroke. Mechanical thrombectomy primarily involves using digital subtraction angiography to locate the blocked blood vessel, then using a sheath to deliver a thrombectomy device (such as a stent) to the site of the blockage, removing the thrombus, and ultimately opening the blocked blood vessel.

[0003] Chinese Patent Application No. CN202320119512 discloses a hemostatic valve and a delivery sheath. The hemostatic valve includes: a valve body having a receiving cavity with a first and a second connecting port for external communication; a first sealing element disposed within the receiving cavity and having a first slit; and a second sealing element disposed within the receiving cavity and having a second slit. The first and second slits are intersected, allowing external instruments to pass through the first and second slits to pass through the first and second connecting ports. The main function of the delivery sheath is to establish a channel, allowing guiding catheters, balloon catheters, or other intravascular devices to smoothly enter the blood vessel.

[0004] Based on the aforementioned technologies, the inventors believe that during the process of removing a thrombus from the obstruction, the operator slowly withdraws the thrombectomy instrument, and a large thrombus may get stuck in the valve body when passing through it. Utility Model Content

[0005] This invention aims to solve the problems existing in the prior art by providing a sheath with an adjustable diameter, thereby reducing the occurrence of large thrombi getting stuck in the valve body.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: an adjustable diameter sheath, comprising a catheter sheath, a connecting tube, and a vascular sheath connected in sequence to form a channel. The vascular sheath includes an adjustable diameter valve body and an adjusting device for adjusting the valve body. The valve body includes an annular tube made of elastic material and a frustum tube made of rigid material. The annular tube is composed of multiple tubular units, each of which is provided with a protruding slide rail. The frustum tube is provided with a slide groove along the slide rail direction. A connecting ring for connecting the slide rail is provided between the annular tube and the frustum tube. The connecting ring is a non-closed ring, and the outer wall of the connecting ring is tightly fitted with the inner wall of the frustum tube. The adjusting device is connected to the connecting ring and passes through the slide groove. The adjusting device can slide along the slide groove direction.

[0007] The valve body is configured as an annular tube made of elastic material and a frustum tube made of rigid material. The annular tube is composed of multiple tubular units, and a protruding slide rail is provided on the surface of each tubular unit. A slide groove is opened on the frustum tube. Then, an open connecting ring is set between the annular tube and the frustum tube to connect the slide rail on the surface of the annular tube, so that the slide rail on the surface of the annular tube can slide simultaneously. Finally, the connecting ring is connected to the adjusting device and the adjusting device passes through the slide rail, so that the adjusting device can slide along the direction of the slide groove, thereby driving the connecting ring connected to the adjusting device to slide along the direction of the slide groove, ultimately realizing the change of the diameter of the annular tube.

[0008] Preferably, the slide rail and the tubular unit are integrally formed.

[0009] Preferably, the adjustment device includes a base fixedly connected to a connecting ring, a button seat located above the base, and a connecting part connecting the base and the button seat.

[0010] Preferably, the button base includes a switch fixedly connected to the button base and a limiting groove formed on the outside of the button base.

[0011] Preferably, the connecting part includes a spring and a hook, one end of the spring is fixed to the connecting base and the other end is fixedly connected to the bottom of the button seat, one end of the hook is fixedly connected to the base and the other end is fastened into the limiting groove.

[0012] Preferably, the base is provided with a stationary contact piece, and the button base is provided with a moving contact piece that cooperates with the stationary contact piece.

[0013] Preferably, the vascular sheath further includes a hemostatic valve seat connected to the valve body, a hemostatic valve cover connected to the hemostatic valve seat, and a hemostatic gasket disposed between the hemostatic valve seat and the hemostatic valve cover.

[0014] Preferably, the hemostatic pad has an incision for instruments to pass through it.

[0015] Preferably, the connecting pipe is provided with an extension tube, the extension tube is connected to the cavity of the connecting pipe, and a three-way valve is connected to the extension tube.

[0016] The beneficial effects of this invention are as follows: This solution uses an annular tube made of elastic material and a frustum tube made of rigid material as the valve body. The annular tube is composed of multiple tubular units, and a protruding slide rail is provided on the surface of each tubular unit. A groove is formed on the frustum tube, and a non-closed connecting ring is provided between the annular tube and the frustum tube to connect the slide rails on the surface of the annular tube, allowing the slide rails on the surface of the annular tube to slide simultaneously. Finally, the connecting ring is connected to an adjusting device, allowing the adjusting device to pass through the slide rails and slide along the groove direction. This, in turn, drives the connecting ring connected to the adjusting device to slide along the groove direction, ultimately achieving a change in the diameter of the annular tube. When the adjusting device slides along the groove direction, the connecting ring connected to the adjusting device also slides along the groove direction, causing a change in the diameter of the frustum tube. The tubular units undergo circumferential compression deformation, resulting in a change in the diameter of the annular tube. Attached Figure Description

[0017] Figure 1 This is a front view of this embodiment;

[0018] Figure 2 This is a cross-sectional view of the end of the adjusting device away from the catheter sheath in this embodiment;

[0019] Figure 3 This is a cross-sectional view of the adjustment device near the end of the catheter sheath in this embodiment;

[0020] Figure 4 This is a cross-sectional view of the valve body in this embodiment;

[0021] Figure 5 This is a schematic diagram of the adjustment device in this embodiment.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Catheter sheath; 2. Connecting tube; 21. Extension tube; 22. Three-way valve; 3. Vascular sheath; 31. Valve body; 311. Ring tube; 3111. Tubular unit; 3112. Slide rail; 312. Frustum tube; 3121. Slide groove; 313. Connecting ring; 32. Adjusting device; 321. Base; 3211. Static contact plate; 322. Button seat; 3221. Limiting groove; 3222. Switch; 3223. Moving contact plate; 323. Connecting part; 3231. Hook; 3232. Spring; 33. Hemostatic valve seat; 34. Hemostatic pad; 35. Hemostatic valve cover. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following description is provided in conjunction with the appendix. Figure 1-5 The following is a detailed description of the specific implementation methods, structures, features, and effects of the present invention, as well as preferred embodiments.

[0025] Combination Figure 1 , Figure 2 and Figure 4 As shown, this embodiment discloses an adjustable-diameter sheath, composed of a catheter sheath 1, a connecting tube 2, and a vascular sheath 3 connected in sequence to form a channel. The vascular sheath 3 includes an adjustable-diameter valve body 31 and an adjusting device 32 for adjusting the valve body 31. The valve body 31 includes an annular tube 311 composed of multiple tubular units 3111 and a frustum tube 312 sleeved outside the annular tube 311. The tubular units 3111 are made of elastic material, and each tubular unit 3111 is provided with a protruding slide rail 3112; The truncated tube 312 is made of rigid material, and a groove 3121 along the direction of the slide rail 3112 is formed on the truncated tube 312. A connecting ring 313 is installed between the annular tube 311 and the truncated tube 312. The connecting tube 2 is an open annular shape used to connect the slide rail 3112, so as to realize the simultaneous sliding of multiple slide rails 3112. An adjusting device 32 is installed on the side wall of the connecting ring 313, and the adjusting device 32 passes through the groove 3121 and can slide along the direction of the groove 3121. In this embodiment, the adjusting device 32 slides along the direction of the groove 3121, thereby driving the sliding of the connecting ring 313 connected to the adjusting device 32, and finally realizing the adjustment of the diameter of the annular tube 311.

[0026] The slide rail 3112 is integrally formed with the tubular unit 3111. On the one hand, the integral forming process is simple; on the other hand, the integral forming of the slide rail 3112 with the tubular unit 3111 avoids the phenomenon of the slide rail 3112 falling off from the tubular unit 3111 during the sliding process.

[0027] Combination Figure 2 and Figure 3 As shown, when the adjusting device 32 is located at the farthest end of the catheter sheath 1, the connecting ring 313 is tightly fitted with the end of the frustum tube 312 with the largest diameter, and at this time the diameter of the annular tube 311 reaches its maximum. As the adjusting device 32 slides closer to the end of the catheter sheath 1, the connecting ring 313 and the frustum tube 312 need to always maintain a tight fit. Due to elastic deformation, the annular tube 311 is deformed by circumferential compression, and the diameter of the annular tube 311 decreases.

[0028] Reference Figure 5As shown, the adjustment device 32 includes a base 321 fixedly connected to a connecting ring 313, a button seat 322 located above the base 321, and a connecting portion 323 connecting the base 321 and the button seat 322. A switch 3222 is fixedly connected to the top of the button seat 322, which facilitates the user's operation of the adjustment device 32. A limiting groove 3221 is formed on the outer side of the button seat 322, and the connecting portion 323 includes spring 3232 and hook 3231. One end of the spring 3232 is fixed to the connecting base 321, and the other end is fixedly connected to the bottom of the button seat 322. One end of the hook 3231 is fixedly connected to the base 321, and the other end is fastened to the limiting groove 3221, allowing it to move within the limiting groove 3221. The limiting groove 3221 is an asymmetrical sliding groove. When the switch 3222 is pressed, the spring 3232 is compressed and deformed. The hook 3231 slides from the lowest point of the limiting groove 3221 to the highest point. When the switch 3222 is released, the spring 3232 returns to its original position and the hook 3231 returns to the lowest point of the limiting groove 3221.

[0029] To enable the adjusting device 32 to achieve a self-locking function, a stationary contact piece 3211 is provided on the base 321, and a moving contact piece 3223 that cooperates with the stationary contact piece 3211 is provided on the button seat 322. When the switch 3222 is pressed, the adjusting device 32 and the connecting ring 313 achieve self-locking, realizing a fixed connection between the adjusting device 32 and the connecting ring 313. The adjusting device 32 can slide on the slide groove 3121, thereby realizing the adjustment of the diameter of the annular pipe 311. When the switch 3222 is pressed again, the adjusting device 32 and the connecting ring 313 are reset, realizing the disconnection between the adjusting device 32 and the connecting ring 313. The adjusting device 32 can no longer slide on the slide groove 3121.

[0030] Reference Figure 2 As shown, the vascular sheath 3 also includes a hemostatic valve seat 33, a hemostatic valve cover 35, and a hemostatic pad 34. One end of the hemostatic valve seat 33 is connected to the valve body 31, and the other end is connected to the hemostatic valve cover 35. The hemostatic pad is located between the hemostatic valve seat 33 and the hemostatic valve cover 35. During use, regardless of whether an instrument passes through, it is necessary to prevent blood leakage. Therefore, the hemostatic pad 34 can be made of an elastic polymer material, such as silicone or any other suitable material. In this embodiment, the hemostatic pad 34 is made of silicone, which has relatively stable chemical properties and good elasticity.

[0031] To allow the instrument to pass smoothly through the hemostatic pad 34, an incision can be made in the hemostatic pad 34. The shape of the incision can be any shape, such as a cross-shaped incision or any other suitable shape. This embodiment uses a cross-shaped incision, which has low resistance, allowing the instrument to pass through the hemostatic pad 34 easily. After the instrument passes through the incision, the hemostatic pad 34 can use its own elastic force to hold the instrument in place, achieving a seal.

[0032] Once digital subtraction angiography identifies the location of the blocked vessel, a thrombectomy device (such as a thrombectomy stent) is delivered to the blockage using a neuro-guidewire and microcatheter. During this process, the neuro-guidewire, microcatheter, and thrombectomy device must sequentially pass through the vascular sheath 3 and connecting tube 2, finally reaching the blockage location via the sheath. Throughout the procedure, the device must be sealed to prevent blood leakage. Therefore, after the device passes through the hemostatic pad 34, the pad 34 must tightly enclose the device. Simultaneously, during device delivery and manipulation, the inner tube needs to be adjusted to the appropriate diameter. During device delivery and manipulation, the operator can press and slide switch 3222 as needed to adjust the annular tube 311 to the appropriate diameter. After the diameter of the annular tube 311 is adjusted, the operator presses switch 3222 again to reset and lock the diameter. Thrombectomy involves using thrombectomy instruments to remove blood clots from the body. During the thrombectomy process, if a large blood clot gets stuck in the valve body 31, the operator can press the switch 3222 as needed to allow the switch 3222 to slide. After sliding the switch 3222 to the appropriate position, the operator can press it again to reset the switch 3222, thereby locking the tube diameter so that the large blood clot can be successfully removed from the valve body 31.

[0033] Reference Figure 1 As shown, one end of the connecting tube 2 is connected to the valve body 31, and the other end is connected to the catheter sheath 1. An extension tube 21 is provided on the connecting tube 2, and the extension tube 21 communicates with the cavity of the connecting tube 2. A three-way valve 22 is fixedly connected to the end of the extension tube 21. The three-way valve 22 can control the opening and closing of the extension tube 21, allowing for blood aspiration or drug injection during surgery.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A sheath with adjustable diameter, comprising a catheter sheath (1), a connecting tube (2), and a vascular sheath (3) sequentially connected to form a channel, characterized in that, The vascular sheath (3) includes a valve body (31) with an adjustable diameter and an adjusting device (32) for adjusting the valve body (31). The valve body (31) includes an annular tube (311) made of elastic material and a frustum tube (312) made of rigid material. The annular tube (311) is composed of multiple tubular units (3111), each of which is provided with a protruding slide rail (3112). The frustum tube (312) is provided with a lateral path along the slide rail (3112). The slide groove (3121) is provided with a connecting ring (313) between the annular tube (311) and the frustum tube (312) for connecting the slide rail (3112). The connecting ring (313) is an open ring. The outer wall of the connecting ring (313) is in close contact with the inner wall of the frustum tube (312). The adjusting device (32) is connected to the connecting ring (313) and passes through the slide groove (3121). The adjusting device (32) can slide along the direction of the slide groove (3121).

2. The adjustable-diameter sheath according to claim 1, characterized in that: The slide rail (3112) and the tubular unit (3111) are integrally formed.

3. The adjustable-diameter sheath according to claim 1, characterized in that: The adjustment device (32) includes a base (321) fixedly connected to a connecting ring (313), a button seat (322) located above the base (321), and a connecting part (323) connecting the base (321) and the button seat (322).

4. The adjustable-diameter sheath according to claim 3, characterized in that: The button base (322) includes a switch (3222) fixedly connected to the button base (322) and a limiting groove (3221) opened on the outside of the button base (322).

5. The adjustable-diameter sheath according to claim 4, characterized in that: The connecting part (323) includes a spring (3232) and a hook (3231). One end of the spring (3232) is fixed to the connecting base (321), and the other end is fixed to the bottom of the button seat (322). One end of the hook (3231) is fixed to the base (321), and the other end is fastened in the limiting groove (3221).

6. The adjustable-diameter sheath according to claim 3, characterized in that: The base (321) is provided with a stationary contact piece (3211), and the button base (322) is provided with a moving contact piece (3223) that cooperates with the stationary contact piece (3211).

7. The adjustable-diameter sheath according to claim 1, characterized in that: The vascular sheath (3) also includes a hemostatic valve seat (33) connected to the valve body, a hemostatic valve cover (35) connected to the hemostatic valve seat, and a hemostatic gasket (34) disposed between the hemostatic valve seat and the hemostatic valve cover.

8. The adjustable-diameter sheath according to claim 7, characterized in that: The hemostatic pad (34) is provided with an incision for instruments to pass through the hemostatic pad (34).

9. The adjustable-diameter sheath according to claim 1, characterized in that: The connecting pipe (2) is provided with an extension pipe (21), the extension pipe (21) is connected to the cavity of the connecting pipe (2), and a three-way valve (22) is connected to the extension pipe (21).

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