Removable support assembly

Abstract

The invention relates to a removable stent assembly, which comprises a stent and a stent removal structure, at least three hanging holes are formed in the stent at intervals in the circumferential direction, the stent removal structure comprises a stent removal sleeve, the stent removal sleeve is provided with an inner hole for a guide wire to penetrate through, and sliding sleeves with the number corresponding to that of the hanging holes are arranged on the stent removal sleeve. The sliding sleeve is assembled on the support taking-out sleeve in the axial direction of the support taking-out sleeve in a guiding and moving mode, a sliding sleeve control guide wire for controlling the sliding sleeve to move is connected to the support taking-out sleeve, and a hooking arm with the near end connected with the sliding sleeve and the far end elastically overhanging in the direction away from the support taking-out sleeve is connected to the sliding sleeve. The far end of the hooking arm is provided with a hooking part used for hooking the corresponding hanging hole, the support taking-out structure further comprises a pull rope corresponding to the hooking arm, and a pull rope penetrating hole allowing the pull rope to penetrate through is formed in the support taking-out sleeve. A removable stent assembly that can be adapted for use in a blood vessel is provided.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a removable bracket assembly. Background Art

[0002] When certain channels in the human body become narrow, stents need to be placed to expand the channels and ensure their normal function. These channels include the respiratory tract and blood vessels.

[0003] Stents are usually made of metal wire and are foreign bodies in the human body. If they stay in the human body for a long time, they will cause a series of negative effects such as granulation hyperplasia.

[0004] Chinese patent CN113616375A discloses a "removable respiratory stent", which includes a support net with a support frame installed inside the support net. The support frame includes multiple coaxial and vertically arranged telescopic support parts, which are fixedly connected by multiple connecting rods. The multiple telescopic support parts are used to support different positions of the support net.

[0005] The telescopic support part includes a retaining frame, the bottom of the retaining frame is rotatably connected to a turbine, and a plurality of worm gears distributed around the turbine are engaged, one end of the plurality of worm gears are rotatably connected to a cross-arc frame, both sides of the cross-arc frame are movably connected to fixed rods, the plurality of fixed rods are fixedly connected to the inner wall of the support net, the inner wall of the plurality of turbines is fixedly connected to an internal gear, the internal gear is engaged with a driving gear, the top of the driving gear is connected to a sleeve, and the sleeve is fixed to the inner wall of the retaining frame.

[0006] While existing removable airway stents can be removed, their complex removal mechanisms result in a larger overall size. They are also only suitable for use in larger diameter passages like the respiratory tract, where the operating range is short. They are less suitable for use in smaller diameter passages like blood vessels, where the operating range is long. Summary of the Invention

[0007] An object of the present invention is to provide a removable stent assembly suitable for use in a blood vessel.

[0008] The technical solution for removing the bracket assembly in the present invention is as follows: The guide wire is guided along the longitudinal axis of the bracket by the guide wire, and the guide wire is guided along the longitudinal axis of the bracket by the guide wire.

[0009] Furthermore, along the axial direction of the bracket, two adjacent hanging holes are staggered in the circumferential direction.

[0010] Furthermore, there are four hanging holes, and along the axis of the bracket, the circumferential angle between two adjacent hanging holes is 90°.

[0011] Furthermore, the guide wires controlled by the sliding sleeves are arranged at intervals in the circumferential direction of the stent removal sleeve; and the holes for the pull ropes are arranged at intervals in the circumferential direction of the stent removal sleeve.

[0012] Furthermore, the stent removal structure also includes a guide groove arranged on the outer peripheral surface of the stent removal sleeve, and the sliding sleeve has a guide matching part that slides with the guide groove, and the length of the guide matching part and the hook arm is less than the axial length of the guide groove.

[0013] Furthermore, the hook arm has a storage position in which the distal end of the hook arm moves toward the direction of the bracket to remove the sleeve and is stored in the guide groove when the pull rope applies tension to the distal end of the hook arm.

[0014] Furthermore, both the hanging hole and the hook portion are provided with marks for display under X-rays.

[0015] The beneficial effects of the present invention are as follows: When the present invention is used, when it is necessary to remove a stent from the body, a pull cord can first be used to apply tension to the distal end of the hook arm, so that the distal end of the hook arm swings toward the stent removal sleeve, thereby reducing the maximum radial dimension of the stent removal structure. Under the guidance of the guide wire, the stent removal sleeve can be guided to the inner side of the stent. The axial movement of the sliding sleeve relative to the stent removal sleeve can change the axial position of the corresponding hook portion. The radial position of the corresponding hook portion can be changed by adjusting the tension of the pull cord, so that the hook portion can smoothly hook the position of the hanging hole on the stent. The stent can be removed from the body by pulling back the stent removal sleeve as a whole. In the present invention, no complex transmission structure such as a worm gear or gear is involved. The hooking process can be achieved by simply controlling the guide wire and the pull cord by the sliding sleeve to adjust the position of the hook portion. The overall radial dimension of the stent removal structure can be made small, and it can be used not only in small-diameter channels such as coronary arteries, but also in large-diameter channels such as the throat and trachea. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the coordination between a stent and a blood vessel in one embodiment of the present invention; Figure 2 This is a schematic diagram of the coordination of a stent removal cannula, a guide wire, and a delivery catheter in one embodiment of the present invention; Figure 3 yes Figure 2 A magnified view of point A; Figure 4 This is a schematic diagram of the coordination between the hook portion and the hanging hole after the hook arm is unfolded in one embodiment of the present invention: Figure 5 yes Figure 4 Enlarged view of point B; 1. Hanging hole; 2. Stent; 3. Blood vessel; 4. Metal wire; 5. Guide groove; 6. Delivery catheter; 7. Sliding sleeve; 8. Stent removal sleeve; 9. Hooking arm; 10. Inner hole; 11. Guide wire; 12. Hooking part; 13. Sliding sleeve to control the guide wire; 14. Guide matching part; 15. Pull rope; 16. Pull rope hole; 17. Hooking slope. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0019] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0020] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0021] An embodiment of a removable stent in the present invention is as follows: Figures 1 to 5 The device shown includes a stent 2 and a stent removal mechanism. In this embodiment, the stent 2 is a vascular dilation stent used within a blood vessel. The stent is constructed from metal wires arranged horizontally and vertically, each with a plurality of mesh holes. The stent is provided with four circumferentially spaced hanging holes 1, each formed from four of the numerous mesh holes. Along the stent axis, adjacent hanging holes 1 are designated as the first hanging hole and the second hanging hole, respectively. The circumferential angle between the first and second hanging holes is 90°. Markings are provided on the hanging holes for visualization under X-rays.

[0022] The bracket removal sleeve is provided with a sliding sleeve 7 corresponding to the number of hanging holes. The bracket removal structure also includes a guide groove 5 provided on the outer peripheral surface of the bracket removal sleeve. The guide groove 5 is an annular groove. The guide groove 5 corresponds one-to-one to the number of sliding sleeves 7. Each sliding sleeve 7 is respectively guided and slidably matched with the corresponding guide groove 5. Specifically, the sliding sleeve 7 has a guide matching portion 14 that is guided and slidably matched with the guide groove. The sliding sleeve 7 is prevented from rotating with the guide groove. The specific anti-rotation form is that the sliding sleeve is provided with a key groove extending axially along the bracket removal sleeve, and the guide groove is provided with a key bar that is slidably matched with the key groove.

[0023] The sliding sleeves 7 are spaced axially along the stent removal cannula 8. A sliding sleeve control wire 13 is connected to the stent removal cannula 8 to control the movement of the sliding sleeves. The sliding sleeve control wire 13 transmits push and pull forces, allowing the sliding sleeve to move back and forth within the guide groove. The sliding sleeve control wires are spaced circumferentially along the stent removal cannula.

[0024] The sliding sleeve is connected to a hook arm 9, the proximal end of which is connected to the sliding sleeve and the distal end of which is elastically cantilevered in the direction away from the stent removal sleeve. The distal end of the hook arm 9 is provided with a hook portion 12, i.e., a hook, for hooking the corresponding hanging hole. The outer groove wall of the hook's hanging groove is a hook slope 17. The stent removal structure also includes a pull rope 15 arranged corresponding to the hook arm. A pull rope through hole 16 for the pull rope to pass through is provided in the stent removal sleeve. The distal end of the pull rope 15 is connected to the side of the hook arm facing the stent removal sleeve after passing through the pull rope through the pull rope through the pull rope. The pull rope 15 is used to transmit tension. When the pull rope is loosened, the hook arm moves under the action of its own elastic force, and the hook portion 12 moves in the radial direction of the stent removal sleeve away from the stent removal sleeve. When the pull rope 15 is tightened, the hook arm 9 has a storage position in which the distal end moves toward the stent removal sleeve and is stored in the guide groove.

[0025] The hook portion 12 is provided with a mark for display under X-ray.

[0026] The hook arm and the hook portion in the present invention are integrally formed of a non-metallic material (or a metallic material), such as polytetrafluoroethylene, polyvinyl chloride, and the like.

[0027] When the stent needs to be removed, the drawstring is pulled to place the hook arms in the storage position within the guide groove. At this point, the overall radial size of the stent removal structure is small and can be loaded into the delivery catheter 6. Under the joint guidance of the delivery catheter and the guide wire 11, the four hook arms are delivered to the inside of the stent, and then the delivery catheter is retracted, with the distal end of the delivery catheter exiting from the proximal side of the stent. In this embodiment, the distal end refers to the end away from the operator, and the proximal end refers to the end close to the operator. The delivery catheter 6 and the guide wire 11 are commonly used components in interventional surgery, and their primary function is to deliver the corresponding instrument to the lesion site of the blood vessel.

[0028] By controlling the guide wire through the sliding sleeve to drive the corresponding sliding sleeve to move axially along the guide groove, the axial position of the corresponding hook part can be changed. By adjusting the tension of the pull rope, the radial position of the corresponding hook part can be adjusted. Each hook part can be adjusted independently. Even if the stent is an irregular circle, each hook part can be connected with the corresponding hanging hole. After the hook part is connected with the corresponding hanging hole, the hook part is moved toward the proximal end a little, and the hanging groove of the hook part is hooked with the hanging hole. At this time, force is applied to the pull rope again, and the hook part will pull the corresponding hanging hole to move radially toward the direction of the stent removal sleeve. This will reduce the bonding force between the stent and the blood vessel. The stent removal sleeve and each hook arm move toward the proximal end as a whole to remove the stent from the blood vessel.

[0029] The four hooking parts are spaced apart axially along the stent removal sleeve and spaced apart circumferentially along the stent removal sleeve, which can achieve uniform force application on the stent. An important feature of the present invention is that the radial position and axial position of each hooking part are independently adjusted. This is because the blood vessel may not be a regular circle. That is, after the stent is expanded, the distance between each hanging hole and the axis of the stent may be inconsistent, and the spacing between two adjacent hanging holes may also be inconsistent. Therefore, in the present invention, the position of the hanging hole is matched by the independent adjustment of each hooking part. Preferably, the hooking part is hooked to the marked hanging hole, but in the present invention, the hanging hole is actually one of the many mesh holes on the stent. There are many mesh holes distributed on the stent, and the spacing between adjacent mesh holes is also very small, which is the width of the metal wire. In actual use, even if the hooking part is not hooked to the designated hanging hole, for example, it is only hooked to the mesh hole near the hanging hole, the stent can still be removed.

[0030] In other embodiments of the present invention, the removable stent assembly may also be applied to the throat, respiratory tract, and other parts.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A removable stent assembly, comprising a stent and a stent removal structure, characterized in that: The bracket is provided with at least three hanging holes arranged at intervals along the circumference, and each hanging hole is arranged at intervals along the axial direction of the bracket, and the bracket removal structure includes a bracket removal sleeve, the bracket removal sleeve has an inner hole for guiding the guide wire to pass through, and the bracket removal sleeve is provided with a sliding sleeve corresponding to the number of hanging holes, and each sliding sleeve is arranged at intervals along the axial direction of the bracket removal sleeve, and the sliding sleeve is assembled on the bracket removal sleeve along the axial direction of the bracket removal sleeve. The bracket removal sleeve is connected to a sliding sleeve control guide wire for controlling the movement of the sliding sleeve, and the sliding sleeve is connected to a hook arm whose proximal end is connected to the sliding sleeve and whose distal end is elastically cantilevered in the direction away from the bracket removal sleeve, and the distal end of the hook arm is provided with a hook portion for hooking the corresponding hanging hole. The bracket removal structure also includes a pull rope arranged corresponding to the hook arm, and a pull rope through hole for the pull rope to pass through is provided in the bracket removal sleeve, and the distal end of the pull rope passes through the pull rope through the pull rope through the through hole and is connected to the side of the hook arm facing the bracket removal sleeve.

2. The removable bracket assembly according to claim 1, wherein: Along the axial direction of the bracket, two adjacent hanging holes are staggered in the circumferential direction of the bracket.

3. The removable bracket assembly according to claim 2, wherein: There are four hanging holes, and along the axis of the bracket, the circumferential angle between two adjacent hanging holes is 90 degrees.

4. The removable bracket assembly according to claim 2, wherein: The sliding sleeve control guide wires are arranged at intervals in the circumferential direction of the stent removal sleeve; and the pull rope through holes are arranged at intervals in the circumferential direction of the stent removal sleeve.

5. The removable bracket assembly according to claim 1, wherein: The stent removal structure also includes a guide groove arranged on the outer peripheral surface of the stent removal sleeve. The sliding sleeve has a guide matching part that slides with the guide groove. The length of the guide matching part and the hook arm is less than the axial length of the guide groove.

6. The removable bracket assembly according to claim 5, characterized in that: The hook arm has a storage position in which the distal end of the hook arm moves toward the direction of removing the sleeve from the bracket and is stored in the guide groove when the pull rope applies tension to the distal end of the hook arm.

7. The removable bracket assembly according to claim 1, wherein: The hanging hole and the hook portion are both provided with marks for display under X-ray.

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