occlusion device

Abstract

The application belongs to the technical field of interventional therapy, and discloses a plugging device, which comprises a guide wire body and an outer tube. The guide wire body can partially extend into a natural cavity and comprises a working section, a spiral plugging part and a connecting section which are sequentially connected. The guide wire body movably penetrates the outer tube, and the spiral plugging part can be withdrawn into the outer tube or extend out of the outer tube. The working section is parallel to the connecting section, the included angle between the axis direction extending from the proximal end to the distal end and the extension direction of the working section extending from the proximal end to the distal end is an acute angle, and the perpendicular distance between the working section and the connecting section is not greater than the radius of the bottom coil of the spiral plugging part. The plugging device effectively improves the operability, operation flexibility and plugging accuracy of the lithotripsy plugging process.

Description

Technical Field

[0001] This invention relates to the field of interventional therapy technology, and more particularly to an occlusion device. Background Technology

[0002] Kidney stones are a common disease in urology. Treatment methods for kidney stones include extracorporeal shock wave lithotripsy (ESWL) and ureteroscopic lithotripsy. The treatment method varies depending on the size of the stone. If the largest diameter of the kidney stone is greater than 0.6 cm, ESWL may cause significant damage and the stone may not be easily expelled; therefore, ureteroscopic lithotripsy is generally used. In ureteroscopic lithotripsy, a ureteroscope is inserted through the urethra, and the stone is then broken up using ultrasound or laser techniques before being removed.

[0003] Ureteroscopic lithotripsy presents several challenges in practice. Stone fragments generated during ureteroscopic lithotripsy can easily enter the renal pelvis and calyces under the influence of irrigation and ureteral dilation, leading to fragmentation failure and residual stones within the kidney. To reduce stone migration during ureteroscopic lithotripsy, distal interception is commonly used. However, existing tools for distal interception typically include a guidewire, a handle, and a sheath. The guidewire extends beyond the sheath, forming a spiral basket to trap fragments; the other end is connected to a handle for the physician to grip. The spiral basket of these interception tools is perpendicular to the guidewire, which can cause jamming during guidewire extension or retraction, hindering flexible operation. Furthermore, the length of the guidewire extending beyond the sheath relies solely on the physician's experience and feel, resulting in insufficient accuracy.

[0004] Therefore, there is an urgent need for a sealing device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing device that effectively improves the operability, operational flexibility, and sealing accuracy of the crushed stone sealing process.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The sealing device includes:

[0008] The guidewire body can partially extend into the natural cavity and includes a working section, a spiral sealing section and a connecting section connected in sequence;

[0009] The outer tube contains the guidewire body, which movably passes through it. The spiral plugging part can be retracted into the outer tube or extend out of it. When the spiral plugging part is fully extended out of the outer tube, the working section is parallel to the connecting section, and the angle between the axial direction extending from the proximal end to the distal end and the extension direction of the working section extending from the proximal end to the distal end is an acute angle. The vertical distance between the working section and the connecting section is not greater than the radius of the bottom coil of the spiral plugging part.

[0010] As a preferred embodiment of the sealing device provided by the present invention, a friction layer is provided on the outer surface of the spiral sealing part, the friction layer being configured to increase the friction between the spiral sealing part and the natural cavity; and / or, a swelling layer is provided on the outer surface of the spiral sealing part, the swelling layer being capable of expanding upon contact with water in the natural cavity.

[0011] As a preferred embodiment of the sealing device provided by the present invention, the friction layer is disposed within the guide wire surface corresponding to the maximum spiral outer diameter of the spiral sealing part.

[0012] As a preferred embodiment of the sealing device provided by the present invention, the swelling layer is made of hydrogel, which is synthesized from collagen, gelatin, hyaluronic acid, chitosan, and fibrin; or,

[0013] The hydrogel is made of polyacrylic acid and its derivatives; or...

[0014] The hydrogel is made of polyvinyl alcohol; or,

[0015] The hydrogel is made of polyethylene oxide; or, the hydrogel is made of polyacrylamide.

[0016] As a preferred embodiment of the occlusion device provided by the present invention, the diameter of the guide wire of the active section gradually decreases along the length direction of the active section towards its head end.

[0017] As a preferred embodiment of the sealing device provided by the present invention, along the extension direction of the active segment, the diameter of the active segment decreases by 0.02mm-0.1mm for every 1cm closer to its head end.

[0018] As a preferred embodiment of the sealing device provided by the present invention, the sealing device further includes a first stop block, which is disposed in the action section and located outside the outer tube, and the diameter of the first stop block is larger than the inner diameter of the outer tube.

[0019] As a preferred embodiment of the sealing device provided by the present invention, guide portions are respectively provided at both ends of the first block, the two guide portions extend in opposite directions, and the diameter of the guide portions gradually decreases along the extension direction of the guide portions.

[0020] As a preferred embodiment of the sealing device provided by the present invention, the connecting section penetrates the outer tube and can extend from the proximal end of the outer tube; the sealing device further includes a second stop, the second stop being disposed on a portion of the connecting section extending out of the outer tube, the diameter of the second stop being larger than the inner diameter of the outer tube.

[0021] As a preferred embodiment of the sealing device provided by the present invention, the sealing device further includes a handle, which is detachably connected to one end of the connecting section away from the working section.

[0022] As a preferred embodiment of the sealing device provided by the present invention, the handle includes a base, a clamping part and an operating part. The clamping part is coaxially connected to the base, and the connecting section passes through the base and the clamping part. The operating part is coaxially disposed on the base. Adjusting the relative position of the operating part and the base can adjust the inner diameter of the clamping part.

[0023] As a preferred embodiment of the sealing device provided by the present invention, the diameter of the spiral sealing portion gradually decreases along the direction away from the connecting section.

[0024] As a preferred embodiment of the sealing device provided by the present invention, the distance between adjacent coils in the spiral sealing portion gradually increases along the axial direction of the spiral sealing portion away from the connecting section; and / or,

[0025] The plugging device further includes an indicator located on a portion of the connecting section extending proximal to the outer tube, the indicator being configured to indicate the maximum outer diameter of the helical plugging portion extending from the outer tube; and / or,

[0026] The cone apex angle of the spiral sealing part is 5°-30°.

[0027] As a preferred embodiment of the sealing device provided by the present invention, the diameter of the guide wire of the spiral sealing part is 0.3mm-0.65mm, and the number of spiral turns of the spiral sealing part is 5-9 turns.

[0028] As a preferred embodiment of the sealing device provided by the present invention, the diameter of the guide wire of the spiral sealing part gradually decreases along the direction away from the connecting section of the spiral sealing part.

[0029] As a preferred embodiment of the sealing device provided by the present invention, along the length direction of the guide wire of the spiral sealing part, the diameter of the guide wire of the spiral sealing part increases by 0.01-0.1 mm for every 2 cm closer to the connecting section.

[0030] As a preferred embodiment of the sealing device provided by the present invention, the guide wire body is heat-shrinkable to form a heat-shrinkable tube, and a tip elastic element is sandwiched between the working section and the heat-shrinkable tube. The tip elastic element is coaxially disposed on the working section and abuts against the head end of the working section.

[0031] As a preferred embodiment of the sealing device provided by the present invention, the vertical distance between the working section and the connecting section is equal to the difference between the radius of the bottom coil of the spiral sealing part and the radius of the top coil of the spiral sealing part.

[0032] The beneficial effects of this invention are:

[0033] The sealing device provided by this invention includes a guidewire body and an outer tube. The guidewire body can partially extend into a natural cavity and includes an action section, a helical sealing section, and a connecting section connected sequentially. The guidewire body moves through the outer tube, and the helical sealing section can be retracted into or extended from the outer tube. That is, the helical sealing section can seal the natural cavity after extending out of the outer tube. When the helical sealing section is fully extended out of the outer tube, the action section is parallel to the connecting section, and the angle between the axial direction extending from the proximal end to the distal end and the extension direction of the action section extending from the proximal end to the distal end is an acute angle. The vertical distance between the action section and the connecting section is not greater than the radius of the bottom coil of the helical sealing section. In other words, the operator controls the action section and the helical sealing section to extend or retract from the outer tube through the connecting section, realizing the operability of the sealing device. The position setting of the action section and the connecting section, as well as their relatively parallel setting, can improve the smoothness of the process of extending and retracting the action section and the helical sealing section from the outer tube, and improve the flexibility of operation. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0035] Figure 1a This is a schematic diagram of the sealing device provided in Embodiment 1 of the present invention;

[0036] Figure 1b This is a schematic diagram of the sealing device provided in Embodiment 1 of the present invention. Figure 2 ;

[0037] Figure 2 This is a partial schematic diagram of the guidewire body provided in Embodiment 1 of the present invention;

[0038] Figure 2aThis is a partial top view of the guidewire body provided in Embodiment 1 of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of the first stop block provided in Embodiment 1 of the present invention;

[0040] Figure 4 This is a partial cross-sectional view of the guidewire body provided in Embodiment 1 of the present invention;

[0041] Figure 5 This is a partial schematic diagram of the guidewire body provided in Embodiment 1 of the present invention. Figure 2 ;

[0042] Figure 6a This is a schematic diagram of the spiral sealing part provided in Embodiment 1 of the present invention;

[0043] Figure 6b This is a schematic diagram of the spiral sealing part provided in Embodiment 1 of the present invention. Figure 2 ;

[0044] Figure 7a This is a schematic diagram of the handle provided in Embodiment 1 of the present invention;

[0045] Figure 7b This is a schematic diagram of the clamping part provided in Embodiment 1 of the present invention;

[0046] Figure 8a This is a schematic diagram of the handle provided in Embodiment 2 of the present invention;

[0047] Figure 8b This is an exploded view of the handle provided in Embodiment 2 of the present invention;

[0048] Figure 8c This is an exploded isometric view of the handle provided in Embodiment 2 of the present invention.

[0049] In the picture:

[0050] 100. Guide wire body; 110. Working section; 120. Spiral sealing section; 121. Friction layer; 130. Connecting section; 140. Heat shrink tubing; 150. Tip elastic element;

[0051] 200. Outer tube;

[0052] 300. First stop block; 310. Guide section;

[0053] 400, Second stop;

[0054] 500, Handle; 510, Base; 511, Connecting cavity; 512, Receiving cavity; 513, Base through hole; 520, Clamping part; 523, Clamping hole; 524, Clamping part gap; 530, Operating part; 531, Mounting cavity; 532, Guide wire channel;

[0055] 600. Indicator signs. Detailed Implementation

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0057] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0060] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0061] Example 1

[0062] Figure 1a A schematic diagram of the sealing device provided in Embodiment 1 of the present invention is shown. Figure 1b This diagram illustrates the structure of the sealing device provided in Embodiment 1 of the present invention. Figure 2 . Reference Figure 1a and Figure 1b This embodiment provides a sealing device, which includes a guide wire body 100 and an outer tube 200. The guide wire body 100 movably passes through the outer tube 200 and is capable of telescoping relative to the outer tube 200.

[0063] Specifically, the guidewire body 100 can partially extend into the natural cavity, including a working section 110, a spiral sealing section 120, and a connecting section 130 connected in sequence. The spiral sealing section 120 can be retracted into the outer tube 200 or can extend out of the outer tube 200 to seal the natural cavity.

[0064] Figure 2 This is a partial schematic diagram of the guidewire body provided in Embodiment 1 of the present invention, with reference to... Figure 2 When the spiral plug 120 is fully extended from the outer tube 200, the working section 110 is parallel to the connecting section 130. The working section 110 is always located outside the distal end of the outer tube 200. The spiral plug 120 can extend and retract relative to the outer tube 200, and the connecting section 130 can extend from the proximal end of the outer tube 200, making it convenient for operators to pull or push, so as to retract or extend the spiral plug 120 from the outer tube 200.

[0065] Figure 3 This diagram shows a structural schematic of the first stop block provided in Embodiment 1 of the present invention, with reference to... Figure 1a , Figure 1b and Figure 3 The sealing device also includes a first stop 300. The first stop 300 is disposed on the working section 110, located outside the outer tube 200, and its diameter is larger than the inner diameter of the outer tube 200. That is, the first stop 300 can limit the working section 110, ensuring it remains outside the outer tube 200. In use, by pulling the connecting section 130, the spiral sealing part 120 retracts into the outer tube 200, then the tip of the working section 110 passes through the stone. Subsequently, pushing the connecting section 130 forward releases the spiral sealing part 120 from the distal end of the outer tube 200 into the natural cavity, achieving sealing. The first stop 300 ensures that the soft and thin working section 110 remains outside the outer tube 200 when the connecting section 130 is pulled back, allowing it to pass through narrow sections of the natural cavity.

[0066] Specifically, guide portions 310 are provided at both ends of the first stop 300, and the two guide portions 310 extend in opposite directions. Along the extension direction of the guide portion 310, the diameter of the guide portion 310 gradually decreases. The guide portion 310 can prevent the formation of a stepped structure at the connection between the first stop 300 and the action section 110, thus preventing obstruction when the action section 110 passes through the stone.

[0067] To be more specific, Figure 4 A partial cross-sectional view of the guidewire body provided in Embodiment 1 of the present invention is shown, with reference to... Figure 4 The guidewire body 100 has a heat-shrinkable tube 140 formed on the outer side of the guidewire end. The heat-shrinkable tube 140 internally includes an active section 110, a spiral sealing section 120, a connecting section 130, and a transition area between the connecting section 130 and the spiral sealing section 120. The length of the heat-shrinkable tube 140 ranges from 10mm to 30mm. The heat-shrinkable tube 140 protects the guidewire end of the guidewire body 100, preventing accidental damage during laser lithotripsy. A tip elastic element 150 is sandwiched between the active section 110 and the heat-shrinkable tube 140. The tip elastic element 150 is coaxially disposed on the active section 110. The head of the active section 110 and the tip elastic element 150 are permanently connected by laser welding, and the head is spherical to increase the contact area between the active section 110 and the natural cavity, preventing damage to the natural cavity by the active section 110. The tip elastic element 150 can improve the elasticity of the tip of the action section 110, making it less prone to bending during use and allowing it to pass more smoothly through the narrow gaps between stones. At the same time, it can improve the torsional stiffness of the tip of the action section 110, making it easier to transmit the rotation operation of the proximal end of the guidewire body 100 to the tip of the guidewire body 100.

[0068] More specifically, the guidewire diameter of the functional segment 110 gradually decreases towards its tip along its length. This configuration effectively improves the passageability of the functional segment 110 within natural cavities. Preferably, in this embodiment, the diameter of the functional segment 110 decreases by 0.02mm-0.1mm for every 1cm approaching its tip along its extension direction.

[0069] Continue to refer to Figure 1a and Figure 1b The sealing device also includes a second stop 400. The second stop 400 is disposed on a portion of the connecting section 130 extending beyond the outer tube 200, and the diameter of the second stop 400 is larger than the inner diameter of the outer tube 200. The second stop 400 functions to limit the movement of the connecting section 130, ensuring that the portion of the connecting section 130 furthest from the outer tube 200 remains outside the outer tube 200, facilitating operation by the operator.

[0070] As a preferred option, continue to refer to Figure 1a and Figure 1b The sealing device also includes an indicator 600. The indicator 600 is located on a portion of the connecting section 130 extending proximal to the outer tube 200, and is configured to indicate the maximum outer diameter of the spiral sealing portion 120 extending from the outer tube 200. Figure 1b As shown, the indicator mark 600 can be a scale or a color block. The "fully released" mark corresponds to the maximum outer ring size of the spiral sealing part 120. The 9mm and 8mm shown correspond to the maximum coil diameter of the spiral sealing part 120 located outside the far end of the outer tube 200 when the connecting section 130 is pushed forward and pulled, which makes it convenient for the operator to understand the real-time release status of the spiral sealing part 120 outside the patient's body.

[0071] Continue to refer to Figure 1a , Figure 1b and Figure 2 The axial direction of the sealing device extending from the proximal end to the distal end is the same as the direction of the action section 110 extending from the proximal end to the distal end. Figure 2 The angle between the center direction 1) and the center direction 1) is an acute angle 1. The tangential direction of the spiral trajectory at the connection between the bottom threaded coil of the spiral sealing part 120 and the connecting section 130 ( Figure 2 The direction of the middle section 2) and the direction of extension of the connecting segment 130 from the distal end to the proximal end ( Figure 2 The included angle between directions 1 and 3 is set to β, which is an obtuse angle. Directions 1 and 3 should remain parallel, and the resulting acute angle 1 facilitates the retraction and release of the spiral sealing section 120.

[0072] The angle β between the plane containing the connecting section 130 and the bottom coil of the spiral sealing part 120 is an obtuse angle. Furthermore, the vertical distance between the functional section 110 and the connecting section 130 is not greater than the radius of the bottom coil of the spiral sealing part 120.

[0073] Preferably, in this embodiment, the vertical distance between the functional section 110 and the connecting section 130 is equal to the radius difference between the bottom and top coils of the spiral sealing portion 120. Figure 2a As shown. That is, the connection position of the working section 110 with the top coil of the spiral plugging part 120 and the connection position of the connecting section 130 with the bottom coil of the spiral plugging part 120 are located on the same side of a central axial plane of the spiral plugging part 120. The above arrangement can improve the resistance during the retraction and release of the spiral plugging part 120.

[0074] Specifically, along the direction away from the connecting section 130, the diameter of the spiral sealing portion 120 gradually decreases. For example... Figure 2As shown, the diameter of the top coil of the spiral sealing section 120 is D1, and the diameter of the bottom coil is D2, where D1 is the smallest coil diameter and D2 is the largest coil diameter. This configuration forms a conical spiral sealing section 120 with a cone apex angle of 5°-30°. The guide wire diameter of the spiral sealing section 120 is 0.3mm-0.65mm, and the number of spiral turns is 5-9.

[0075] To be more specific, Figure 6a This diagram illustrates the structure of the spiral sealing part provided in Embodiment 1 of the present invention. (Refer to...) Figure 6a Along the axial direction of the spiral sealing portion 120 away from the connecting section 130, the distance between adjacent coils in the spiral sealing portion 120 gradually increases. When the spiral sealing portion 120 is subjected to an external force along the extension direction of the connecting section 130, the coil with the largest outer diameter undergoes the greatest deformation displacement, and this deformation displacement increases the spiral pitch, causing smaller stones to be released prematurely. Setting a smaller spiral pitch at the coil with the largest outer diameter can reduce the increase in pitch caused by external force, thus ensuring the interception effect of smaller stones.

[0076] Optionally, Figure 6b This diagram illustrates the structure of the spiral sealing part provided in Embodiment 1 of the present invention. Figure 2 , refer to Figure 6b In other embodiments, the spiral sealing portion 120 can also be an evenly spaced spiral, but its side is concave towards the center when viewed along its axial cross-section. This structure results in a smaller diameter of the spiral coil in the middle position along the height direction of the spiral sealing portion 120, leading to greater resistance to deformation under external force, thus improving the interception effect on smaller stones.

[0077] More specifically, along the direction away from the connecting section 130, the diameter of the guide wire in the spiral sealing section 120 gradually decreases. Preferably, along the length of the guide wire in the spiral sealing section 120, for every unit length (2 cm) closer to the connecting section 130, the diameter of the guide wire in the spiral sealing section 120 increases by 0.01-0.1 mm. That is, the diameter change of the guide wire in the spiral sealing section 120 is relatively gradual, while the diameter change of the guide wire in the working section 110 is relatively rapid. This two-stage gradual change structure ensures that the tip of the working section 110 is sufficiently fine, while the guide wire in the spiral sealing section 120 is relatively thick, thereby ensuring the strength of the guide wire body 100. During use, the spiral coil of the spiral sealing section 120 is subjected to the impact of an external water flow, with the water flowing from the bottom of the spiral sealing section 120 towards its cone apex. The entire spiral coil of the spiral sealing section 120 is subjected to impact force because it is made of only one spiral. The force from the top accumulates on the bottom coil, making it more prone to axial deformation. This results in uneven axial deformation of the spiral sealing section 120, leading to a larger gap between the bottom coils and a reduced or even absent sealing effect. To avoid this, the overall deformation of the spiral sealing section 120 needs to be uniform; therefore, a gradually changing diameter design is adopted. Along the axial direction of the spiral sealing section 120, the area closer to the connecting section 130 has higher resistance to deformation than the area farther away from the connecting section 130.

[0078] Figure 5 A partial schematic diagram of the guidewire body provided in Embodiment 1 of the present invention is shown. Figure 2 , refer to Figure 5 A friction layer 121 is provided on the outer surface of the spiral sealing portion 120. This friction layer 121 is configured to increase the friction between the spiral sealing portion 120 and the natural cavity, thereby increasing stability during blocking and reducing displacement of the spiral sealing portion 120 within the natural cavity. Furthermore, the friction layer 121 does not affect the process of the spiral sealing portion 120 retracting into the outer tube 200. Specifically, the friction layer 121 can be achieved through sandblasting, spring winding, or coating.

[0079] Specifically, the friction layer 121 is provided on the entire outer surface of the spiral plugging part 120 or on the guide wire surface corresponding to the maximum spiral outer diameter of the spiral plugging part 120. During the entire release process, the diameter of the spiral plugging part 120 continuously increases to correspond to different natural cavity dimensions. Before complete release, a few more turns of the spiral plugging part 120 can be released to make the outer diameter of the spiral plugging part 120 slightly larger than the diameter of the natural cavity, creating appropriate compression between the spiral plugging part 120 and the natural cavity to increase friction. When the spiral plugging part 120 is nearly fully released, the spiral plugging part with the friction layer 121 increases the coefficient of friction with the inner wall of the natural cavity, generating considerable frictional force. This allows the plugging structure to remain in place when subjected to external forces, such as the impact force of laser-induced stone fragmentation, improving the stability of the plugging device.

[0080] In other words, by setting the friction layer 121 to increase the friction on the surface of the spiral plugging part 120, the spiral plugging part 120 becomes more stable during plugging after being released within the natural cavity, reducing the occurrence of displacement. When the extent of release of the spiral plugging part 120 is not a concern, i.e., this solution can be used in the state where the spiral plugging part 120 is fully released, the contact between the maximum outer ring of the spiral plugging part 120 and the natural cavity is mainly achieved by setting the friction layer 121 only on the guide wire surface corresponding to the maximum spiral outer diameter of the spiral plugging part 120.

[0081] Preferably, the outer surface of the spiral sealing portion 120 may also be provided with a swelling layer. In this embodiment, the swelling layer is a hydrogel coating, which is made of hydrogel synthesized from collagen, gelatin, hyaluronic acid, chitosan, and fibrin; or, the hydrogel is made of polyacrylic acid and its derivatives; or, the hydrogel is made of polyvinyl alcohol; or, the hydrogel is made of polyethylene oxide; or, the hydrogel is made of polyacrylamide. Such hydrogels have a fast swelling rate and excellent biocompatibility; after absorbing water, they have a certain water retention capacity, and in the laser lithotripsy process, the absorbed water helps to absorb some of the thermal effects caused by direct laser irradiation.

[0082] Preferably, the swelling layer and the aforementioned friction layer 121, such as a coiled spring, can be provided simultaneously, and the two are superimposed to further improve the stability of the spiral sealing part 120 when blocking, and improve the sealing effect.

[0083] Figure 7a A schematic diagram of the handle provided in Embodiment 1 of the present invention is shown. (Refer to...) Figure 7a The sealing device also includes a handle 500, which is detachably connected to one end of the connecting section 130 away from the actuating section 110.

[0084] Specifically, the handle 500 includes a base 510, a clamping part 520, and an operating part 530. The clamping part 520 is coaxially connected to the base 510, and the connecting segment 130 passes through the base 510 and the clamping part 520. The operating part 530 is coaxially disposed on the base 510. By adjusting the relative position of the operating part 530 and the base 510, the inner diameter of the clamping part 520 can be adjusted to clamp the connecting segment 130.

[0085] More specifically, the base 510 has a connecting cavity 511 and a receiving cavity 512 that communicate with each other. The inner diameter of the connecting cavity 511 is smaller than the inner diameter of the receiving cavity 512. The inner diameter of the receiving cavity 512 is larger than the outer diameter of the head end of the operating part 530. The head of the clamping part 520 extends into the connecting cavity 511, and the head end of the operating part 530 extends into the receiving cavity 512 and is sleeved on the outside of the clamping part 520.

[0086] The inner wall of the connecting cavity 511 is provided with an internal thread, and the periphery of the head end of the operating part 530 is provided with an external thread. The head end of the operating part 530 can extend into the receiving cavity 512 and into the connecting cavity 511, and is screwed into the connecting cavity 511 with adjustable depth.

[0087] More specifically, a clamping cavity 531 and a guide wire channel 532 are sequentially formed along the length of the operating part 530, with the guide wire channel 532 communicating with the clamping cavity 531. The clamping cavity 531 is located at the head end of the operating part 530 and can be clamped to the outside of the clamping part 520. The head of the clamping part 520 is installed in the connecting cavity 511. The clamping part 520 extends from the head end of the operating part 530 into the clamping cavity 531, and a clamping hole 523 is formed along the axial direction of the clamping part 520 for the connecting section 130 to pass through. Figure 7b As shown, the clamping part 520 has a multi-lobed structure, forming a clamping hole 523. There is a gap between adjacent lobes. The multi-lobed structure can move closer to the central axis after being pressed on the outside, so as to reduce the size of the clamping hole 523.

[0088] The connecting section 130 can extend from the end of the base 510 away from the operating part 530 into the connecting cavity 511, pass through the clamping part 520 axially, and then pass through the guide wire channel 532 of the operating part 530.

[0089] The outer diameter of the clamping part 520 gradually decreases from its head to its tail. The operating part 530 clamps the outer side of the clamping part 520 from its tail. When the operating part 530 moves towards the head of the clamping part 520, it presses against the periphery of the clamping part 520, causing it to contract towards the central axis. This reduces the inner diameter of the clamping hole 523, thus clamping the connecting section 130. Through this process, the handle 500 is fixed to the operating part 530. When it is necessary to remove the handle 500, the operating part 530 is moved away from the head of the clamping part 520, releasing the pressure on the periphery of the clamping part 520. At this time, the inner diameter of the clamping hole 523 increases, releasing the connecting section 130, allowing the handle 500 to be quickly removed.

[0090] Example 2

[0091] This embodiment also provides a blocking device. The only difference between this embodiment and Embodiment 1 is the structure of the handle 500.

[0092] Specifically, Figure 8a This diagram shows a schematic representation of the handle provided in Embodiment 2 of the present invention. Figure 8b An exploded view of the handle provided in Embodiment 2 of the present invention is shown. Figure 8c An exploded isometric view of the handle provided in Embodiment 2 of the present invention is shown. (Refer to...) Figures 8a-8c The handle 500 of the sealing device provided in this embodiment includes a base 510, a clamping part 520, and an operating part 530. The clamping part 520 is coaxially connected to the base 510, and the connecting segment 130 passes through the base 510 and the clamping part 520. The operating part 530 is coaxially disposed on the base 510. By adjusting the relative position of the operating part 530 and the base 510, the inner diameter of the clamping part 520 can be adjusted to clamp the connecting segment 130.

[0093] More specifically, a base through hole 513 is formed along the axial direction of the base 510, and a clamping gap 524 is formed along the axial direction of the clamping part 520. The base 510 and the clamping part 520 are coaxially connected to each other, and the base through hole 513 communicates with the clamping gap 524. The operating part 530 is a cylindrical structure with openings at both ends, and the operating part 530 can be sleeved on the outside of the base 510 and the clamping part 520. The connecting section 130 can extend from the end of the base 510 away from the clamping part 520 into the base through hole 513 and pass through the clamping gap 524.

[0094] More specifically, the clamping part 520 has a multi-lobed structure, with its outer peripheral side inclined. Along the direction away from the base 510, the outer peripheral side of the clamping part 520 gradually moves away from its central axis. When the operating part 530, sleeved on the outside of the base 510 and the clamping part 520, moves in a direction where the outer diameter of the clamping part 520 gradually increases, the multi-lobed clamping part 520 is pressed against the inner wall of the operating part 530, contracting towards its central axis, thus reducing the diameter of the clamping part gap 524 and clamping the connecting section 130. When it is necessary to disassemble the handle 500, the operating part 530 is moved in a direction where the outer diameter of the clamping part 520 gradually decreases. The peripheral side of the clamping part 520 loses external pressure, and the diameter of the clamping part gap 524 increases. At this time, the connecting section 130 can be released, enabling quick disassembly of the handle 500.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A sealing device, characterized in that, include: The guidewire body (100) can partially extend into a natural cavity and includes a working section (110), a spiral sealing section (120), and a connecting section (130) connected in sequence. The outer tube (200) is movably penetrated by the guide wire body (100). The spiral plug (120) can be retracted into or extend out of the outer tube (200) through the radial end of the outer tube (200). When the spiral plug (120) is fully extended out of the outer tube (200), the action section (110) is parallel to the connecting section (130). The angle between the axial direction of the spiral plug (120) extending from the proximal end to the distal end and the direction of the action section (110) extending from the proximal end to the distal end, i.e., direction 1, is an acute angle, which helps the spiral plug (120) to retract and release. The angle between the tangent direction of the spiral trajectory at the connection between the bottom coil of the spiral plug (120) and the direction of the connecting section (130) extending from the distal end to the proximal end, i.e., direction 2, is an obtuse angle. The vertical distance between the functional section (110) and the connecting section (130) is not greater than the radius of the bottom coil of the spiral sealing part (120); The outer surface of the spiral sealing part (120) is provided with a swelling layer, which can expand when exposed to water in the natural cavity; The swelling layer is made of hydrogel, which is synthesized from collagen, gelatin, hyaluronic acid, chitosan, and fibrin; or, The hydrogel is made of polyacrylic acid and its derivatives; or... The hydrogel is made of polyvinyl alcohol; or, The hydrogel is made of polyethylene oxide; or, the hydrogel is made of polyacrylamide; Along the direction away from the connecting section (130) from the spiral sealing part (120), the diameter of the coil of the spiral sealing part (120) gradually decreases.

2. The sealing device according to claim 1, characterized in that, A friction layer (121) is provided on the outer surface of the spiral sealing part (120), and the friction layer (121) is configured to increase the friction between the spiral sealing part (120) and the natural cavity.

3. The sealing device according to claim 2, characterized in that, The friction layer (121) is set within the guide wire surface corresponding to the maximum spiral outer diameter of the spiral sealing part (120).

4. The sealing device according to claim 1, characterized in that, As the length of the active segment (110) approaches its head end, the diameter of the guidewire in the active segment (110) gradually decreases.

5. The sealing device according to claim 4, characterized in that, Along the extension direction of the active segment (110), the diameter of the active segment (110) decreases by 0.02mm-0.1mm for every 1cm closer to its head end.

6. The sealing device according to claim 1, characterized in that, The sealing device further includes a first stop (300), which is disposed in the action section (110) and located outside the outer tube (200). The diameter of the first stop (300) is larger than the inner diameter of the outer tube (200).

7. The sealing device according to claim 6, characterized in that, The first stop (300) has guide portions (310) at both ends, and the two guide portions (310) extend in opposite directions. Along the extension direction of the guide portions (310), the diameter of the guide portions (310) gradually decreases.

8. The sealing device according to claim 1, characterized in that, The connecting segment (130) passes through the outer tube (200) and can extend from the proximal end of the outer tube (200); the sealing device further includes a second stop (400), which is disposed on a portion of the connecting segment (130) extending out of the outer tube (200), and the diameter of the second stop (400) is greater than the inner diameter of the outer tube (200).

9. The sealing device according to claim 1, characterized in that, The sealing device also includes a handle (500), which is detachably connected to one end of the connecting section (130) away from the action section (110).

10. The sealing device according to claim 9, characterized in that, The handle (500) includes a base (510), a clamping part (520), and an operating part (530). The clamping part (520) is coaxially connected to the base (510). The connecting section (130) passes through the base (510) and the clamping part (520). The operating part (530) is coaxially disposed on the base (510). By adjusting the relative position of the operating part (530) and the base (510), the inner diameter of the clamping part (520) can be adjusted.

11. The sealing device according to claim 1, characterized in that, Along the axial direction of the spiral sealing portion (120) away from the connecting section (130), the distance between adjacent coils in the spiral sealing portion (120) gradually increases; and / or, The sealing device further includes an indicator (600) disposed on a portion of the connecting section (130) extending proximal to the outer tube (200), the indicator (600) being configured to indicate the maximum outer diameter of the helical sealing portion (120) extending from the outer tube (200); and / or, The cone apex angle of the spiral sealing part (120) is 5°-30°.

12. The sealing device according to claim 1, characterized in that, The guide wire diameter of the spiral plugging part (120) is 0.3mm-0.65mm, and the spiral number of turns of the spiral plugging part (120) is 5-9 turns.

13. The sealing device according to claim 12, characterized in that, Along the direction away from the connecting section (130) from the spiral plug (120), the diameter of the guide wire of the spiral plug (120) gradually decreases.

14. The sealing device according to claim 13, characterized in that, Along the length of the guide wire of the spiral plug (120), the diameter of the guide wire of the spiral plug (120) increases by 0.01-0.1 mm for every 2 cm closer to the connecting section (130).

15. The sealing device according to claim 1, characterized in that, The guidewire body (100) is heat-shrinkable to form a heat-shrinkable tube (140). A tip elastic element (150) is sandwiched between the working section (110) and the heat-shrinkable tube (140). The tip elastic element (150) is coaxially disposed on the working section (110) and abuts against the head end of the working section (110).

16. The sealing device according to claim 1, characterized in that, The vertical distance between the working section (110) and the connecting section (130) is equal to the difference between the radius of the bottom coil of the spiral sealing part (120) and the radius of the top coil of the spiral sealing part (120).

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