CN217339003U - Nickel-titanium alloy support remove device - Google Patents

Abstract

A nitinol stent retrieval device for retrieving a nitinol stent from within a tubular organ includes a multi-lumen tube having at least one inflatable balloon and a retrieval device; the multi-lumen tube having a plurality of ports for injecting a liquid into the tubular organ and the inflatable balloon and inserting the extraction device; percutaneously inserting an extraction device into the lumen of the tubular organ, injecting a liquid into the inflatable balloon and the lumen of the tubular organ, the liquid transforming the nitinol stent from the expanded state to the collapsed state, and then removing the nitinol stent in the collapsed state by means of an extraction device; the utility model discloses simple structure, convenient operation for nickel titanium alloy support can remove through the minimal access surgery skin, and the wound that not only causes the patient is littleer, makes the patient recovered sooner, can go on in the outpatient service environment moreover, has saved medical resource, has alleviateed patient's economic burden.

Description

Nickel-titanium alloy support remove device

Technical Field

The utility model relates to a medical instrument, concretely relates to nickel titanium alloy support remove device.

Background

Atherosclerosis is the deposition of fatty plaque on the luminal surface of an artery, which in turn leads to narrowing of the cross-sectional area of the artery. Eventually, this deposition can block blood flow distal to the lesion, causing ischemic damage to the tissues supplied by the artery. Narrowing of the coronary lumen leads to myocardial destruction, leading first to angina, then myocardial infarction, and finally death. Stents are commonly deployed in the lumens of arteries, heart valves, and other tubular organs (e.g., the bile duct) to ensure smooth flow of blood or bodily fluids through the arteries or lumens. Stents are metal stents that are permanently implanted in the diseased arterial segment to maintain luminal patency and improve blood flow. Thus, placement of the stent in the affected arterial segment prevents arterial recoil and subsequent closure.

Stents are typically formed from malleable metals, such as 300 series stainless steel, or from elastic metals, such as superelastic and shape memory alloys. Currently, stents in common use are self-expanding stents formed of a nickel titanium alloy having a shape memory that self-expands or springs back to its memorized, expanded shape from a compressed state.

Once the stent is deployed, in some cases, undesirable growth of tissue surrounding the stent may occur. This tissue growth may occlude blood flow in the tubular organ, resulting in restenosis. Restenosis refers to the re-narrowing of the artery after the initial successful deployment of the stent. Furthermore, in a high proportion of patients, stents become sites of recurrent stenosis due to thickening of the arterial wall (neointimal hyperplasia). In addition, in some cases, the stent may be displaced from the deployment site. In this case, the stent needs to be replaced with another stent, removed, or repositioned. The existing main method for removing the stent is to adopt open surgery, which causes great trauma and slow rehabilitation to the patient and causes heavy economic burden to the patient.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect that exists among the prior art, the utility model aims to provide a nickel titanium alloy support remove device, simple structure, convenient operation for the nickel titanium alloy support can remove through the minimal access surgery skin, and the wound that not only leads to the fact the patient is littleer, makes the patient recovered faster, can go on in the outpatient service environment moreover, has saved medical resource, has alleviateed patient economic burden.

The utility model discloses a realize like this, the utility model relates to a nickel titanium alloy support remove device adopted technical scheme is: a nitinol stent retrieval device for retrieving a nitinol stent from within a tubular organ, comprising:

a multi-lumen tube comprising an inflatable end having at least one inflatable balloon and an injectable end having a plurality of ports for injecting liquid through the multi-lumen tube into the inflatable balloon;

an extraction device introduced into the lumen of the multi-lumen tube through the port, the extraction device for transforming the nitinol stent from an expanded state to a contracted state to withdraw the liquid injected into the nitinol stent.

Further, the extraction device comprises a hook and a sheath, wherein the hook is used for removing the nickel-titanium alloy stent from the inside of the lumen of the tubular organ; the sheath is configured to receive the nitinol stent.

Further, the hook is made of stainless steel.

Further, the sheath can be pulled to deliver the nitinol stent out of the tubular organ.

Further, the sheath is constructed of a biocompatible compressible material selected from the group consisting of polyethylene and silicone rubber.

Further, the extraction device further comprises a spring-loaded push rod connected to the hook for actuating the hook.

Further, each of the ports is connected to at least one lumen of the multi-lumen tube.

Further, the inflatable balloon is constructed of a biocompatible conductive plastic selected from the group consisting of polytetrafluoroethylene and polyethylene.

Further, the nickel-titanium alloy stent is a heart stent.

Further, the liquid is a cold saline solution.

Compared with the prior art, the nickel-titanium alloy stent extracting device provided by the utility model has the advantages that the nickel-titanium alloy stent extracting device is used for extracting a nickel-titanium alloy stent from the inside of a tubular organ, and comprises a multi-cavity tube with at least one expandable air bag and an extracting device; the multi-lumen tube having a plurality of ports for injecting a liquid into the tubular organ and the inflatable balloon and inserting the extraction device; percutaneously inserting an extraction device into the lumen of the tubular organ, injecting a liquid into the inflatable balloon and the lumen of the tubular organ, the liquid transforming the nitinol stent from the expanded state to the collapsed state, and then removing the nitinol stent in the collapsed state by means of an extraction device; the utility model discloses simple structure, convenient operation for nickel titanium alloy support can remove through the minimal access surgery skin, and the wound that not only causes the patient is littleer, makes the patient recovered sooner, can go on in the outpatient service environment moreover, has saved medical resource, has alleviateed patient's economic burden.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a nickel-titanium alloy stent extraction device provided by an embodiment of the present invention.

Fig. 2 is a schematic distal end view of a nitinol stent retrieval device having an inflatable balloon according to an embodiment of the present invention.

Fig. 3 is a schematic view of a proximal end of a nickel-titanium alloy stent retrieval device according to an embodiment of the present invention.

Fig. 4 is a distal end view of a nitinol stent retrieval device having two inflatable balloons as provided by an embodiment of the present invention.

Detailed Description

In order to make the objects, 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 for purposes of illustration only and are not intended to limit the invention.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. It is to be understood that the terms "upper", "lower", "left", "right", and the like, if any, are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms in the drawings describing the positional relationships are used for illustrative purposes only and are not to be construed as limiting the present patent, and the specific meanings of the terms will be understood by those skilled in the art according to the specific circumstances.

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a pair of nickel titanium alloy support remove device for inside nickel titanium alloy support that takes out of follow tubular organ, include:

a multi-lumen tube comprising an inflatable end having at least one inflatable balloon and an injectable end having a plurality of ports for injecting liquid through the multi-lumen tube into the inflatable balloon;

an extraction device introduced into the lumen of the multi-lumen tube through the port, the extraction device for transforming the nitinol stent from an expanded state to a contracted state to withdraw the liquid injected into the nitinol stent.

A nitinol stent retrieval device provided above for retrieving a nitinol stent from within a tubular organ includes a multi-lumen tube having at least one inflatable balloon and a retrieval device; the multi-lumen tube having a plurality of ports for injecting a liquid into the tubular organ and the inflatable balloon and inserting the extraction device; percutaneously inserting an extraction device into the lumen of the tubular organ, injecting a liquid into the inflatable balloon and the lumen of the tubular organ, the liquid transforming the nitinol stent from the expanded state to the collapsed state, and then removing the nitinol stent in the collapsed state by means of the extraction device; the utility model discloses simple structure, convenient operation for nickel titanium alloy support can remove through the minimal access surgery skin, and the wound that not only causes the patient is littleer, makes the patient recovered sooner, can go on in the outpatient service environment moreover, has saved medical resource, has alleviateed patient's economic burden.

As an embodiment of the present invention, the extraction device comprises a hook and a sheath, the hook is used for removing the nitinol stent from the inside of the lumen of the tubular organ; the sheath is configured to receive the nitinol stent.

As an embodiment of the present invention, the hook is made of stainless steel.

As an embodiment of the present invention, the sheath can be pulled to carry the nitinol stent out of the tubular organ.

As an embodiment of the invention, the sheath is comprised of a biocompatible compressible material selected from the group consisting of polyethylene and silicone rubber.

In particular, the extraction device further comprises a spring-loaded push rod connected to the hook for actuating the hook.

Preferably, each of said ports is connected to at least one lumen of said multi-lumen tube.

Preferably, the inflatable balloon is constructed of a biocompatible conductive plastic selected from the group consisting of polytetrafluoroethylene and polyethylene.

Specifically, the nickel-titanium alloy stent is a heart stent.

In particular, the liquid is a cold saline solution.

Referring to fig. 1 to 4, a preferred embodiment of the present invention is:

fig. 1 is a schematic view of an extraction device 100 for extracting a nitinol stent from the interior of a tubular organ according to a preferred embodiment of the present invention. The retrieval device 100 has two portions including a distal end 102 and a proximal end 104. Distal end 102 is the portion of retrieval device 100 that is inserted into the intraluminal interior of the tubular organ, distal end 102 being a multilumen tube and also referred to as multilumen tube 102; proximal end 104 is the portion of extraction device 100 that is not inserted into the lumen of the tubular organ, and proximal end 104 is used to insert extraction device 100 and fluid into the lumen of the tubular organ. Furthermore, the proximal end 104 is used for moving the multilumen tubing 102 in and out of the tubular organ. The multi-lumen tube 102 is inserted into the lumen of the tubular organ until it reaches the point of deployment of the nitinol stent.

In one embodiment of the present invention, the nitinol stent has no openings or sharp edges at either end to prevent injury to the walls of the tubular organ, thereby facilitating removal of the nitinol stent.

Fig. 2 is a schematic view of the multi-lumen tube 102 of the retrieval device 100 having one inflatable balloon 202 in accordance with a preferred embodiment of the present invention. The multi-lumen tube 102 has two or more lumens. In one embodiment of the present invention, the lumen is coaxial with the axis of the multi-lumen tube 102.

In one embodiment of the present invention, the multi-lumen tube 102 has a circular cross-section. Where the tubular organ is a coronary artery, the length of the multilumen tubing 102 is in the range of 100 cm to 120 cm. Where the tubular organ is a peripheral artery, the length of the multi-lumen tube 102 is suitable for placement in the treatment area adjacent to the nitinol stent to be extracted. The diameter of the multilumen tubing 102 facilitates placement of the multilumen tubing 102 into the tubular organ. In case the tubular organ is a coronary artery, the diameter of the multilumen tubing 102 is in the range of 0.25 cm to 0.50 cm. Furthermore, the multi-lumen tube 102 is made of a biocompatible polymer, such as polyether, polyetheretherketone and polyurethane. Biocompatible polymers are well known to those of ordinary skill in the art. These materials may be used as single layer or multilayer structures.

The multi-lumen tube 102 has an expandable end 202 and an injectable end 204. The expandable end 202 has an inflatable balloon 206 and an extraction device 208. In one embodiment of the present invention, inflatable balloon 206 has portions that are annularly intersected along its entire length. In another embodiment of the present invention, the inflatable balloon 206 has a disc-shaped cross-section. The inflatable balloon 206 is shown in an inflated state. The injectable end 204 is a port connected to the proximal end 104 of the retrieval device 100 through a port for inserting an extraction device 208, injecting a liquid into the inflatable balloon 206, and injecting the liquid into the lumen of the tubular organ.

Inflatable balloon 206 is made of a material having suitable heat transfer characteristics, i.e., the material is a good conductor of heat. In one embodiment of the present invention, the inflatable balloon 206 is made of a biocompatible conductive plastic. Examples of biocompatible conductive plastics include, but are not limited to, Polytetrafluoroethylene (PTFE), dacron, and polyethylene. Biocompatible conductive plastics are well known to those of ordinary skill in the art. The inflatable balloon 206 is inflated by injecting a liquid therein. The injected liquid is preferably a cold saline solution. In one embodiment of the present invention, inflatable balloon 206 is positioned to a point within the lumen of the tubular organ at which the nitinol stent in its expanded state has been deployed. The inflatable balloon 206 in the inflated state temporarily blocks blood flow within the lumen of the tubular organ. The injected liquid within the inflatable balloon 206 facilitates the transition of the nitinol stent from the expanded state to the contracted state.

Extraction device 208 includes a hook 210 and a sheath 212. Hook 210 is inserted into the lumen of the tubular organ through sheath 212. Hook 210 is positioned such that it attaches to or contacts the collapsed nitinol stent. The hooks 210 are removed from the collapsed nitinol stent, i.e., the hooks 210 separate the collapsed nitinol stent from the lumen wall of the tubular organ. In addition, the hooks 210 help move the folded nitinol stent into the sheath 212. In one embodiment of the present invention, hook 210 is actuated with the aid of a spring-loaded push rod (not shown in the figures). The spring-loaded push rod is used to move hook 210 back and forth within the lumen of the tubular organ. When the spring-loaded push rod is activated, the spring expands, pushing hook 210 into the lumen of the tubular organ. In its compressed state (deactivated), the spring removes the hook 210 from the tubular organ, moving the collapsed nitinol stent towards the sheath 212. As will be appreciated, one of ordinary skill in the art may use hooks 210 of various configurations, for example, clips, prongs, or prongs that will move the folded nitinol stent toward the sheath 212.

The sheath 212 is used to transport the nitinol stent in its contracted state out of the tubular organ. The sheath 212 is preferably made of a biocompatible, compressible material, such as polyethylene, silicone rubber, or the like. Sheath 212 has a proximal end and a distal end. The shape of the sheath 212 facilitates removal of the nitinol stent from the lumen of the tubular organ. In one embodiment of the present invention, the distal end of the sheath 212 has a conical shape. Having an inner diameter and an outer diameter that are larger than the inner and outer diameters of the proximal end of sheath 212. Sheath 212 is folded and inserted into one of the lumens of multi-lumen tube 102. The distal end of the tubular organ expands as sheath 212 enters the lumen. In the expanded state, the distal end of the sheath 212 has a diameter greater than the diameter of the multi-lumen tube 102. This helps it receive the removed nitinol stent. In addition, when the sheath 212 holding the removed nitinol stent is retrieved through one of the lumens of the multi-lumen tube 102, the distal end of the sheath 212 is folded. This facilitates the transport of the removed nitinol stent out of the tubular organ. In addition, the compressibility of the sheath 212 facilitates its movement through one of the lumens of the multi-lumen tube 102.

Fig. 3 is a schematic view of the proximal end 104 of the retrieval device 100, in accordance with a preferred embodiment of the present invention. Proximal end 104 has three ports, hereinafter referred to as port 302, port 304, and port 306. Each port is connected to at least one lumen of multi-lumen tube 102. Ports 302, 304 and 306 are used for injecting fluids and inserting the extraction device 208 into the lumen of the multi-lumen tube 102. The ports 302, 304 and 306 have annular gaps that facilitate the injection of liquid and the insertion of the extraction device 208. In one embodiment of the present invention, the extraction device 208 is inserted through port 302. The liquid is injected through port 304 with the aid of a pump or infusion device. In another embodiment of the present invention, the inflatable balloon 206 is inflated by injecting a liquid through port 304 via a syringe or pressure bag and injecting a liquid into it through port 306. Ports 302, 304 and 306 have one-way valves to prevent backflow of the injected liquid or body fluid.

Fig. 4 is a schematic view of the distal end 102 of an extraction device 100 having two inflatable balloons, according to a preferred embodiment of the present invention. The multi-lumen tube 102 is inserted into the lumen of a tubular organ, such as a coronary artery, until it reaches the point of deployment of the nitinol stent. The inflatable end of the multi-lumen tube 102 has two inflatable balloons 402 and 404. The inflatable balloon is shown in an inflated state. Inflatable balloons 402 and 404 are preferably made of a material with suitable heat transfer characteristics, i.e., a good conductor of heat. In one embodiment of the present invention, inflatable balloons 402 and 404 are made of biocompatible conductive plastic. Examples of biocompatible conductive plastics include, but are not limited to, Polytetrafluoroethylene (PTFE) and polyethylene. Inflatable balloons 402 and 404 are placed on the proximal and distal ends of the nitinol stent and then inflated with a liquid as described herein. The inflatable balloons 402 and 404 prevent blood flow within the lumen of the tubular organ in which the nitinol stent is placed. In addition, inflatable balloons 402 and 404 form an enclosed space around the nitinol stent. The cooling tube 406 injects a liquid into the blocked space and is inserted through one of the ports. The enclosed space enables additional heat transfer between the nitinol stent and the injected liquid. This helps to transform the nitinol stent from the expanded state to the collapsed state. Once the nitinol stent is collapsed, the collapsed nitinol stent is removed from the tubular organ using hooks 210 and sheath 212.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A nitinol stent retrieval device for retrieving a nitinol stent from within a tubular organ, comprising:

a multi-lumen tube comprising an inflatable end having at least one inflatable balloon and an injectable end having a plurality of ports for injecting liquid through the multi-lumen tube into the inflatable balloon;

an extraction device introduced into the lumen of the multi-lumen tube through the port, the extraction device for transforming the nitinol stent from an expanded state to a contracted state to withdraw the liquid injected into the nitinol stent.

2. The nitinol stent retrieval device of claim 1, wherein the extraction device comprises a hook and a sheath, the hook for removing the nitinol stent from the intraluminal aspect of the tubular organ; the sheath is configured to receive the nitinol stent.

3. The nitinol stent retrieval device of claim 2, wherein the hook is made of stainless steel.

4. A nitinol stent retrieval device according to claim 2 wherein the sheath can be pulled to deliver the nitinol stent out of the tubular organ.

5. The nickel titanium alloy stent retrieval device of claim 4, wherein said sheath is comprised of a biocompatible compressible material selected from the group consisting of polyethylene and silicone rubber.

6. The nitinol stent retrieval device of claim 5, wherein the extraction device further comprises a spring-loaded push rod connected to the hook, the spring-loaded push rod for actuating the hook.

7. A nitinol stent retrieval device according to claim 1, wherein each of the ports is connected to at least one lumen of the multi-lumen tube.

8. A nickel titanium alloy stent retrieval device according to claim 1 wherein the inflatable balloon is constructed of a biocompatible conductive plastic selected from the group consisting of polytetrafluoroethylene and polyethylene.

9. A nitinol stent retrieval device according to claim 1 wherein the nitinol stent is a cardiac stent.

10. A nickel titanium alloy stent retrieval device according to claim 1 wherein the liquid is a cold saline solution.

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