WO2020052355A1

WO2020052355A1 - Intravascular foreign body extraction apparatus

Info

Publication number: WO2020052355A1
Application number: PCT/CN2019/098064
Authority: WO
Inventors: 张庭超; 李阳; 彭波波
Original assignee: 杭州唯强医疗科技有限公司
Priority date: 2018-09-13
Filing date: 2019-07-27
Publication date: 2020-03-19

Abstract

Disclosed is an intravascular foreign body extraction apparatus, comprising: an outer sheath tube (2000) hollowed out to form a first channel; a guide sheath (5000) hollowed out to form a second channel (5110), wherein the second channel (5110) is in communication with the first channel, and a distal end of the guide sheath (5000) is detachably connected to a proximal end of the outer sheath tube (2000); a push rod (1100) movably passing through a distal end of the first channel from a proximal end of the second channel (5110); and a capture ring (1000) connected to a distal end of the push rod (1100) for capturing an intravascular foreign body. The apparatus has the advantage of improving the safety of intravascular foreign body extraction surgery.

Description

Device for removing foreign matter in blood vessel

The present invention requires the priority of the prior application with the application number 201811068409.1 of the invention titled "An Intravascular Foreign Body Removal Device" submitted on September 13, 2018 and the invention name submitted on September 13, 2018 as "A blood vessel Priority of the application of “Internal Foreign Object Removal Device” application number 201821501272.X, the content of the aforementioned prior application is incorporated into this text by way of introduction.

Technical field

The invention relates to the technical field of interventional medical instruments, and in particular, to a device for removing foreign matter in a blood vessel.

Background technique

With the widespread application of minimally invasive interventional diagnosis and treatment technology, foreign body residues in blood vessels have become a serious complication in interventional diagnosis and treatment due to improper operation and quality of interventional products. Foreign body residues can cause cardiovascular mechanical damage, perforation, and thrombosis, and severe cases can directly lead to death of patients. In the past, the most direct way to deal with such complications was to remove foreign bodies by surgery. Because foreign bodies may flow with blood in the blood vessels, and surgery requires opening the cavity, the risk of surgery is high, and the patient recovers slowly. In recent years, interventional treatment methods can also be used, using imaging equipment, percutaneous vascular cavity, using a puncture needle, catheter or other foreign body removal device to remove foreign bodies remaining in the blood vessel. Compared with surgery, this method is more effective for patients. The trauma is smaller, the patient recovers faster, and the risk of surgery is lower.

As shown in FIG. 1, a prior art intravascular foreign body removal device generally includes a hollow capture catheter 9200, a loader 9300, a ring-shaped capture ring 9100, and a push rod connected to the proximal end of the capture ring 9100. 9400. The loader 9300 is usually made of a harder material, and the capture catheter 9200 needs to pass through the patient, and is usually made of a softer material. When in use, firstly pass the capture ring 9100 and the push rod 9400 through the loader 9300 and the capture catheter 9200 in this order. At this time, the capture tube 9200, the loader 9300 and the push rod 9400 are coaxially set in a movable manner, and then move far away. Push the capture ring 9100 at the end until the capture ring 9100 catches the foreign body in the blood vessel, and then retract the push rod 9400 and the capture ring 9100 to bring the foreign body out of the patient. During the clinical operation, because the loader 9300 and the capture catheter 9200 are not connected together, the operator can only hold the loader 9300 and the capture catheter 9200 at the same time with their hands to connect the two together, which will not only affect Other operators' operations may even affect the safety of the operation.

Summary of the Invention

The technical problem to be solved by the embodiments of the present invention is to provide a device for removing foreign matter in a blood vessel. Can improve the safety of removal of intravascular foreign body surgery.

In order to solve the above technical problems, the present invention provides a device for removing foreign matter in a blood vessel, including:

Outer sheath, the hollow forming a first channel;

An introduction sheath in which a second passage is formed in the hollow, the second passage is in communication with the first passage, and a distal end of the introduction sheath is detachably connected to a proximal end of the outer sheath tube;

A push rod that is movable into the proximal end of the second channel and out of the distal end of the first channel;

The catching ring, which is connected to the distal end of the push rod, is used to catch foreign bodies in the blood vessels.

In an embodiment of the present invention, the introduction sheath includes a gripping portion and a locking portion, and a distal end of the locking portion is detachably connected to a proximal end of the gripping portion.

In an embodiment of the present invention, a second joint is provided at the proximal end of the holding part, the locking part includes a second gland and a locking chuck, and the second gland and the second joint Removably connected and axially movable, the locking chuck is located in a second gland, and the locking chuck clamps the push pin when the second gland moves to the far end to the farthest distance. Pole.

In an embodiment of the present invention, the locking portion includes a second squeeze column, the second squeeze column is located between the second gland and the second joint, and the second squeeze column is located at the second In the gland, the proximal end of the second squeeze column forms a squeeze hole whose inner diameter gradually decreases from the proximal end to the distal end, and the locking chuck includes a movable portion at the distal end, and the movable portion has at least two When the second gland is moved distally, the movable part moves to the distal end of the squeeze hole to clamp the push rod located in the movable part.

In an embodiment of the present invention, a second seal is provided between the second squeeze post and the second joint, and the push rod passes through the middle of the second seal, and when the second pressure When the cover is moved to the distal end, the second pressing cover pushes the locking chuck, the locking chuck pushes the second squeeze post, and the second squeeze post presses the second seal to deform to Hold the second seal tightly inside the push rod.

In an embodiment of the present invention, the locking portion includes a second squeeze column, the second squeeze column is located in the second gland, and a distal end of the second squeeze column forms an inner diameter from the distal end to the The compression hole is gradually reduced at the proximal end, and the locking chuck includes a movable portion at the proximal end, the movable portion has at least two branches that can be opened and closed in a radial direction, and when the second gland is moved to the distal end During the movement, the movable part is moved to the proximal end of the squeeze hole to clamp the push rod located in the movable part.

In an embodiment of the present invention, a second seal is provided between the second squeeze post and the second gland, and the push rod passes through the middle of the second seal, and when the second When the gland moves to the distal end, the second gland pushes the second seal, the second seal pushes the second squeeze post, and the second gland presses the second seal to deform, So that the second seal can hold the push rod inside.

In an embodiment of the present invention, the locking portion includes a second pressing post, the second pressing post is located in the second gland, and the inside of the second gland forms an inner diameter toward the locking chuck. The compression hole gradually increases from the proximal end to the distal end. The locking chuck includes a movable portion at the proximal end. The movable portion has at least two branches that can be opened and closed radially. During the movement of the gland to the distal end, the movable part moves to the proximal end of the squeeze hole to clamp the push rod located in the movable part.

In an embodiment of the present invention, the introduction sheath includes a connection part and a grip part, the connection part is located at a distal end of the introduction sheath, the connection part is detachably connected to the outer sheath tube, and the connection The proximal end of the part is connected to the holding part.

In an embodiment of the present invention, the connecting portion includes a first joint and a first gland, a distal end of the first joint is detachably connected to the outer sheath tube, and a proximal end of the first joint is connected to the grip. The holding part is connected, and the distal end of the first gland is fixedly connected with the proximal end of the first joint.

In an embodiment of the present invention, the connecting portion further includes a first pressing post, a proximal end of the first pressing post is fixedly connected to a distal end of the holding part, and the first pressing post is located at The inside of the proximal end of the first joint is in contact with the first joint.

In an embodiment of the present invention, the connecting portion further includes a first seal, and the first seal is located between the first pressing post and the first joint for sealing the two. Connected, the push rod passes through the first middle hole of the first seal.

In an embodiment of the present invention, a step is formed on the outer side of the distal end of the first pressing post, the first seal is disposed on the platform surface of the step, and the distal end of the first pressing post is pressed against the First seal.

In an embodiment of the present invention, the holding portion includes a main body portion and a branch portion, the branch portion is fixedly connected to or integrally formed with the main body portion, and a portion of the second channel is located in the main body portion, and the branch portion The branch channel is hollow, and the branch channel is in communication with the second channel.

In an embodiment of the present invention, the device for removing foreign bodies in a blood vessel further includes a twist handle, and the twist handle is connected to the proximal end of the push rod to rotate the push rod through the twist handle.

In an embodiment of the present invention, the capture ring includes an inner core and a cladding layer, and the cladding layer covers an outer side of the inner core.

In an embodiment of the present invention, the capture ring is made of a plurality of metal wires twisted and heat-set.

In an embodiment of the invention, the outer sheath is made of high-density polyethylene.

The implementation of the embodiments of the present invention has at least the following beneficial effects:

During the surgery, since the distal end of the introduction sheath is detachably connected to the proximal end of the outer sheath tube, the operator only needs to hold one of the outer sheath tube and the introducer sheath with one hand, thereby facilitating the operator's operation relative to the prior art. , Help to improve the efficiency and safety of surgery.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative labor.

FIG. 1 is a schematic structural diagram of a device for removing foreign bodies in a blood vessel in the prior art;

2 is a schematic structural diagram of a device for removing foreign bodies in a blood vessel according to a first embodiment of the present invention;

3 is a schematic structural diagram of a connection between an exception sheath tube, an introduction sheath, and a push rod according to the first embodiment of the present invention;

FIG. 4 is an exploded view between an exception sheath tube, an introduction sheath, and a push rod according to the first embodiment of the present invention; FIG.

5 is a right side view of the introduction sheath of the first embodiment of the present invention;

Figure 6 is a sectional view taken along line F-F of Figure 5 of the present invention;

7 is an enlarged view of a circular area in FIG. 6;

8 is a sectional view of an introduction sheath according to a second embodiment of the present invention;

9 is another cross-sectional view of an introduction sheath according to an embodiment of the present invention;

10 is a schematic structural diagram of a device for removing foreign bodies in a blood vessel according to a third embodiment of the present invention;

11 is a cross-sectional view of a twist handle of a third embodiment of the present invention;

Icon number:

1000, 9100-capture ring; 1100, 9400-putter; 2000-outer sheath tube; 5000, 5000a-introduction sheath; 5100-first joint; 5110-second channel; 5200-first seal; 5300- A gland; 5400-first abutment column; 5500-grip; 5510-branch channel; 5600-second seal; 5700-second squeeze column; 5800-locking chuck; 5900-second pressure Cap; 4000-twisted handle; 4100-twisted chuck; 9200-trapping catheter; 9300-loader.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms "including" and "having" and any variations thereof appearing in the specification, claims, and drawings of this application, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device containing a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment. In addition, the terms "first", "second", "third", and the like are used to distinguish different objects and are not used to describe a specific order.

For clarity, the end near the operator is referred to as the proximal end, and the end far from the operator is referred to as the distal end.

First embodiment

An embodiment of the present invention provides an intravascular foreign body removing device, which is used to extend into a patient's blood vessel, capture the foreign body in the blood vessel, and take the foreign body out of the patient. The foreign bodies include, but are not limited to, vascular filters, vascular plugs, catheters, guide wires, balloons, stents, and occlusive umbrellas that fall off during intervention of congenital heart disease. Referring to FIG. 2 to FIG. 7, the intravascular foreign body removing device includes an outer sheath tube 2000, an introduction sheath 5000, a push rod 1100, and a capture ring 1000.

In this embodiment, the outer sheath tube 2000 is hollow to form a first channel (not shown in the figure), the first channel penetrates the outer sheath tube 2000 in the axial direction, and the first channel is used to pass the push rod 1100, the capture ring 1000, and its Captured foreign body. The outer sheath tube 2000 has a certain axial length, and is preferably made of high-density polyethylene (HDPE for short). The outer sheath tube 2000 made of high-density polyethylene not only has a smooth appearance and facilitates passage in human blood vessels, but also has a more Good abrasion resistance.

In this embodiment, the introduction sheath 5000 is hollow to form a second channel 5110, the second channel 5110 penetrates the introduction sheath 5000 in the axial direction, and the second channel 5110 is in communication with the first channel. In this embodiment, the distal end of the introduction sheath 5000 is detachably connected to the proximal end of the outer sheath tube 2000. Specifically, the introduction sheath 5000 includes a connection portion (not shown in the figure), and the connection portion is located at the distal end of the introduction sheath 5000. The connection part is detachably connected to the outer sheath tube 2000, and here, the detachable connection is screwed by a Luer joint. However, the present invention is not limited to this, and in other embodiments of the present invention, it may also be other known detachable connection modes.

In this embodiment, the push rod 1100 can move through the proximal end of the second channel 5110 and from the distal end of the first channel. At this time, the capture ring 1000 is connected to the distal end of the push rod 1100, that is, The putter 1100 with the capture ring 1000 penetrates from the proximal end of the second channel 5110 and exits from the distal end of the first channel. The putter 1100 has a certain axial length. Since the putter 1100 needs to be pushed in the first channel of the outer sheath tube 2000, and the outer sheath tube 2000 needs to enter the curved human blood vessel, the putter 1100 is made of a relatively soft material. In this embodiment, a core wire made of nickel-titanium alloy wire is used as the push rod 1100, and the distal end of the push rod 1100 is ground to form a certain cone shape, so that the push rod 1100 is easier to advance in the first channel of the outer sheath tube 2000. The push rod 1100 may be a hollow tube or a solid rod, and the cross section is preferably circular.

In this embodiment, the capture ring 1000 is connected to the distal end of the push rod 1100 and is used to capture foreign objects in the blood vessel. In this embodiment, the capture ring 1000 is detachably connected to the push rod 1100, and the capture ring 1000 and the push rod 1100 pass through the proximal end of the second channel 5110 and exit from the distal end of the first channel together. In this embodiment, the capture ring 1000 may be in the shape of a circular ring, an elliptical ring, etc. The capture ring 1000 is disposed substantially perpendicular to the axial direction of the push rod 1100. The capture ring 1000 itself may be a closed structure or may have at least one Open and open structure. In this embodiment, the capture ring 1000 is annular, and the capture ring 1000 is perpendicular to the axial direction of the push rod 1100 and protrudes outward in the radial direction. The advantage of this structure is that it is convenient for the grasping process. Controls the direction of the ring.

In this embodiment, the capture ring 1000 is made of a shape memory material such as a nickel-titanium alloy, so as to be easily accommodated in the introduction sheath 5000. In this embodiment, the capture ring 1000 is formed by at least one metal wire being shaped, and preferably is made by twisting a plurality of metal wires and heat-setting. In this embodiment, the capture ring 1000 includes an inner core and a cladding layer, and the cladding layer covers the outer side of the inner core. Specifically, the inner core is first made of a nickel-titanium alloy, and then the outer surface is coated with a A spring made of tungsten wire is used as a covering layer, and then a heat-setting process is performed to obtain a capture ring 1000. When making the inner core, a nickel-titanium wire is used as the core wire, and then 4-8 (preferably 6) nickel-titanium wires are tightly wound on the outside of the core wire to obtain the inner core. In this embodiment, the capture ring 1000 made of a plurality of metal wires has high safety and reliability. Even if one of the metal wires is loosened or broken by force, foreign matter can be prevented from falling out of the capture ring 1000.

During the clinical operation, the operating pusher 1100 and the capture ring 1000 connected to the distal end of the pusher 1100 sequentially pass through the second channel 5110, the first channel reaches the patient's blood vessel, and then continues to push the capture ring 1000 to the distal end. Until the capture ring 1000 catches the foreign body in the blood vessel, the push rod 1100 and the capture ring 1000 are retracted to bring the foreign body out of the patient. During the operation, since the distal end of the introduction sheath 5000 is detachably connected to the proximal end of the outer sheath 2000, the operator only needs to hold one of the outer sheath 2000 and the introduction sheath 5000 with one hand, which is more convenient to hold. Only one hand can perform other operations, such as pushing or retracting the push rod 1100, etc., which facilitates the operation compared with the prior art and is beneficial to improving the efficiency and safety of the operation.

Please refer to FIG. 3 to FIG. 6. In this embodiment, the introduction sheath 5000 further includes a holding part 5500, and the distal end of the holding part 5500 is connected to the proximal end of the connection part, which is specifically a non-detachable connection such as an adhesive. The holding part 5500 is used for holding by the operator during the operation.

In this embodiment, the connecting portion includes a first joint 5100 and a first gland 5300, a distal end of the first joint 5100 is screwed to the outer sheath tube 2000, and a proximal end of the first joint 5100 is connected to the holding portion 5500. The first gland 5300 is sleeved on the distal end of the holding part 5500 and the distal end of the first gland 5300 is fixedly connected to the proximal end of the first joint 5100. Here, to achieve a fixed connection by an adhesive, the first joint 5100 and The first pressing cover 5300 can rotate relative to the holding portion 5500.

In this embodiment, the connecting portion further includes a first pressing post 5400, and a proximal end of the first pressing post 5400 is fixedly connected to a distal end of the holding part 5500, which is here through an adhesive. To achieve a fixed connection, the outer diameter of the proximal end of the first pressing post 5400 is larger than the inner diameter of the first pressing cap 5300, between the first pressing post 5400, the first pressing cap 5300, the first joint 5100, and the holding portion 5500. The connection method is as follows: First, the first pressing cover 5300 is sleeved on the distal end of the holding portion 5500, and then the proximal end of the first pressing post 5400 and the distal end of the holding portion 5500 are bonded and fixed together, and then The distal end of the first compression post 5400 is inserted into the proximal end of the first joint 5100, and then the distal end of the first compression cap 5300 is fixedly connected to the proximal end of the first joint 5100. It is larger than the inner diameter of the first gland 5300, so that the proximal end of the first pressing post 5400 abuts the first gland 5300 to prevent the first gland 5300 from detaching from the proximal end of the holding part 5500. In this embodiment, the first pressing post 5400 is located inside the proximal end of the first joint 5100 and abuts against the first joint 5100. Not only can the stable connection between the holding part 5500 and the connection part be achieved, but also the first pressing can be achieved. Relative rotation between the post 5400 and the first joint 5100.

In this embodiment, the connecting portion further includes a first seal 5200. The first seal 5200 is located between the first pressing post 5400 and the first joint 5100 for a sealed connection therebetween. During the process of connecting the cover 5300 with the first joint 5100, the first pressing post 5400 receives the force of the first pressing cap 5300, and the first pressing post 5400 and the first joint 5100 squeeze the first seal 5200 to achieve both. Between sealed connections. Preferably, the first sealing member 5200 is coated with silicone oil to facilitate relative rotation between the first pressing post 5400 and the first joint 5100. The first seal 5200 is provided with at least one first intermediate hole in the axial direction, the first intermediate hole is a part of the second channel 5110, and the first intermediate hole is used to pass the push rod 1100.

Referring to FIG. 6, in this embodiment, a step is formed on the outer side of the distal end of the first pressing column 5400, and the number of the steps is at least two levels. The first seal 5200 is provided on the platform surface of the most distal step. The first seal 5200 is placed between the distal end of the first pressing post 5400 and the proximal end of the first joint 5100 and is compressed by the first pressing post 5400. Thus, the first joint 5100 and the first pressing post The 5400 achieves a hermetic connection. Due to the adhesion between the proximal end of the first pressing column 5400 and the holding portion 5500, a sealed connection between the first joint 5100 and the holding portion 5500 is achieved. When liquid is input from the holding portion 5500, the liquid will not leak.

Please refer to FIGS. 3 to 7. In this embodiment, the introduction sheath 5000 further includes a locking portion (not shown in the figure). In this embodiment, the locking portion is used to clamp the push rod 1100 to limit the The movement of the putter 1100. The distal end of the locking portion is detachably connected to the proximal end of the holding portion 5500. Specifically, a second joint (not shown in the figure) is provided at the proximal end of the holding part 5500. In this embodiment, the outer surface of the proximal end of the second joint is provided with external threads. The locking part includes a second gland 5900. And locking chuck 5800. In this embodiment, the inner surface of the distal end of the second gland 5900 is provided with an internal thread. The two are realized by screwing the external thread of the second joint and the internal thread of the second gland 5900. Removable connection, and the second gland 5900 is axially moved. The locking chuck 5800 includes a movable part at the distal end and a chuck body at the proximal end. The chuck body is fixedly connected or integrally formed with the movable part. The chuck body is hollow as a part of the second channel 5110. The movable part has at least two Two radially openable and closable branches. When subjected to a radially inward external force, at least two branches are tightened inward to clamp the push rod 1100 located in the movable part. When no radially inward external force is received, During the action, at least two branches are naturally unfolded, and the push rod 1100 located in the movable part will not be pinched, and the push rod 1100 can move in the axial direction. When the second gland 5900 moves to the far end, the second gland 5900 and the second joint gradually tighten. When the second gland 5900 moves to the farthest distance, the second gland 5900 and the first The two joints are screwed into place. At this time, the locking chuck 5800 clamps the push rod 1100 located therein. The push rod 1100 cannot move in the axial direction to achieve positioning of the push rod 1100 and prevent the operator from operating the push rod 1100 by mistake The push rod 1100 can be moved by introducing the sheath 5000.

In order to realize that the clamping chuck 5800 clamps the push rod 1100 during the screwing process of the second gland 5900 and the second joint, please refer to FIG. 6 and FIG. 7. In this embodiment, the locking portion further includes a second squeeze. Column 5700, the second squeeze column 5700 is located between the second gland 5900 and the second joint, and the second squeeze column 5700 is located in the second gland 5900. In this embodiment, the second squeeze column 5700 is located in the lock Between the clamping chuck 5800 and the second joint, the second extrusion column 5700 is hollow to form a part of the second channel 5110. The proximal end of the second extrusion column 5700 forms an extrusion hole whose inner diameter gradually decreases from the proximal end to the distal end. The pressure hole has a circular table shape. The distal end of the squeeze hole communicates with the second channel 5110 in the second squeeze column 5700. The movable part of the locking chuck 5800 is located in the squeeze hole. During the screwing movement to the longest distance, the movable part moves to the distal end of the squeeze hole, and at least two branches of the movable part will gather and clamp the push rod 1100 located therein. When the second gland 5900 is moved to the proximal end, at least two branches of the movable part will slowly unfold, at this time, the push rod 1100 is not clamped, and the push rod 1100 can move in the axial direction. In addition, in this embodiment, the distal end of the locking chuck 5800 is in the shape of a circular table, which facilitates the distal end of the locking chuck 5800 to enter the squeeze hole.

In this embodiment, the locking portion further includes a second seal 5600. The second seal 5600 is located between the second squeeze post 5700 and the second joint. The second seal 5600 is hollow to form a part of the second channel 5110. The push rod 1100 passes through the middle of the second sealing member 5600. The second sealing member 5600 is placed between the distal end of the second compression post 5700 and the proximal end of the second joint and is compressed by the second compression post 5700. Therefore, the second joint and the second squeeze column 5700 are sealedly connected, and the two can be relatively rotated.

When the second gland 5900 moves to the distal end, the second gland 5900 pushes the locking chuck 5800. The second gland 5900 forces the movable part of the locking chuck 5800 to advance to the distal end of the squeeze hole, thereby forcing the locking. The movable part of the chuck 5800 clamps the push rod 1100.

If a patient needs to be injected with a drug or a contrast agent during a clinical operation, the prior art in the background art needs to first withdraw the capture ring and the push rod from the patient's body through the lumen of the capture catheter, and then pass the capture catheter's Intravenous injection of drugs or contrast agents adds extra surgical steps and prolongs the operation time. In order to reduce the operation steps and shorten the operation time, in this embodiment, the holding portion 5500 includes a main body portion and a branch portion, and the number of the branch portions may be one or more, and in this embodiment, it is one. The branch portion is fixedly connected to the main body portion. The shape of the branch portion and the main body portion is Y-shaped. A portion of the second channel 5110 is located in the main body portion. The branch portion is hollow to form a branch channel 5510. The branch channel 5510 communicates with the second channel 5110. The branch channel 5510 is used to inject a liquid, which may be a drug or a contrast agent. When it is necessary to input medicine or contrast agent, the operator only needs to input through the branch channel 5510. The medicine or contrast agent enters the human blood vessel through the gap between the push rod 1100, the second channel 5110, and the first channel. The second seal 5600 holds the push rod 1100 tightly, and because the first seal 5200 seals the gap between the first joint 5100 and the first compression column 5400, the drug or contrast agent will not leak from the foreign body removal device in the blood vessel .

In this embodiment, the first joint 5100, the first pressing cover 5300, the first pressing post 5400, the Y-shaped holding portion 5500, and the second pressing cover 5900 all use a polymer material such as polycarbonate (abbreviated as: PC). Injection molding. The first seal 5200 and the second seal 5600 are made of elastic materials such as silicone and rubber. The second extrusion column 5700 is made of polymer materials such as ABS resin. The locking chuck 5800 is made of copper. And other metal materials.

Second embodiment

The structure of a device for removing a foreign body in a blood vessel according to the second embodiment of the present invention is basically the same as the structure of the device for removing a foreign body in a blood vessel of the first embodiment, except that the introduction sheath 5000a of the second embodiment is the same as the first embodiment The structure of the introduction sheath 5000 is different. FIG. 8 is a schematic diagram of the structure of the introduction sheath 5000a in the second embodiment of the present invention. The structure of FIG. 8 is similar to the structure of FIG. 6, and therefore the same element symbols represent the same components. The main difference between the example introduction sheath 5000 is the structure of the locking portion.

Referring to FIG. 8, in this embodiment, the locking portion includes a second gland 5900, a second seal 5600, a second pressing post 5700, and a locking chuck 5800, the locking chuck 5800, and the second pressing The post 5700 and the second seal 5600 are located in the second joint, the lock collet 5800 is located between the second joint and the second squeeze post 5700, and the second squeeze post 5700 is located in the lock collet 5800 and the second seal Between 5600, the second seal 5600 is located between the second squeeze column 5700 and the second gland 5900, and the movable part of the locking chuck 5800 is located at its proximal end, and the chuck body is located at the first part of the holding part 5500. In the two channels 5110, an extrusion hole of the second extrusion column 5700 is located at a distal end of the second extrusion column 5700.

In addition, in another embodiment of the present invention, as shown in FIG. 9, the second seal 5600 is located between the second squeeze post 5700 and the second joint, and the locking chuck 5800 is located between the second squeeze post 5700 and the second Between the gland 5900, the inside of the second gland 5900 facing the locking chuck 5800 forms a pressing hole whose inner diameter gradually increases from the proximal end to the distal end. The pressing hole has a round table shape, and the locking chuck 5800 The movable part may be located in the squeeze hole, and the chuck body is located in the second channel 5110 of the second squeeze column 5700.

Third embodiment

FIG. 10 is a schematic diagram of the structure of a device for removing foreign matter in a blood vessel according to a third embodiment of the present invention. The structure of FIG. 10 is similar to the structure of FIG. 2, and therefore the same component symbols represent the same components. The main difference is the addition of a twist handle.

Please refer to FIG. 10 and FIG. 11. In this embodiment, the intravascular foreign body removal device further includes a twist handle 4000 connected to the proximal end of the push rod 1100 to rotate the push rod 1100 through the twist handle 4000. . Specifically, the twist handle 4000 includes an internal twist chuck 4100, and the proximal end of the push rod 1100 passes through the twist chuck 4100. The twist chuck 4100 clamps the proximal end of the push rod 1100, and an operator can pass the twist The handle 4000 rotates the push rod 1100, thereby adjusting the position of the capture ring 1000 at the distal end of the push rod 1100. BACKGROUND During the adjustment of the capture ring 1000, the torque applied by the hand to the soft push rod 1100 cannot be smoothly transmitted to the capture ring 1000, and the twist handle 4000 is used to rotate the push rod 1100, which is more beneficial to the operator. The transmission of external force makes the adjustment process convenient and fast. In addition, in other embodiments of the present invention, the locking portion may not be provided with a locking chuck, and the positions of the push rod and the capture ring may be adjusted directly by twisting the handle.

It should be noted that each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments refer to each other. can. As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For the related parts, refer to the description of the method embodiment.

The above disclosure is only the preferred embodiments of the present invention, and of course, the scope of the rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

An intravascular foreign body extraction device, including:

Outer sheath, the hollow forming a first channel;

An introduction sheath in which a second passage is formed in the hollow, the second passage is in communication with the first passage, and a distal end of the introduction sheath is detachably connected to a proximal end of the outer sheath tube;

A push rod that is movable into the proximal end of the second channel and out of the distal end of the first channel;

The catching ring, which is connected to the distal end of the push rod, is used to catch foreign bodies in the blood vessels.
The intravascular foreign body extraction device according to claim 1, wherein the introduction sheath includes a gripping portion and a locking portion, and a distal end of the locking portion is detachably connected to a proximal end of the gripping portion.
The intravascular foreign body extraction device according to claim 2, wherein a proximal end of the holding portion is provided with a second joint, the locking portion includes a second gland and a locking chuck, and the second pressure The cover is detachably connected to the second joint and can be moved in the axial direction. The locking chuck is located in the second gland, and the lock is locked when the second gland moves to the farthest distance. A collet clamps the push rod.
The device for removing foreign matter in a blood vessel according to claim 3, wherein the locking portion comprises a second squeeze post, the second squeeze post is located between the second gland and the second joint, and the first Two squeeze columns are located in the second gland, and the proximal end of the second squeeze column forms a squeeze hole whose inner diameter gradually decreases from the proximal end to the distal end, and the locking chuck includes a movable portion at the distal end. The movable part has at least two branches that can be opened and closed in a radial direction. When the second gland moves distally, the movable part moves to the distal end of the squeeze hole to clamp the push rod located in the movable part. .
The intravascular foreign body extraction device according to claim 4, wherein a second seal is provided between the second squeeze column and the second joint, and the push rod passes through the middle of the second seal When the second pressing cover moves to the distal end, the second pressing cover pushes the locking chuck, the locking chuck pushes the second squeeze column, and the second squeeze column presses the The second seal is deformed so that the second seal can hold the push rod therein.
The intravascular foreign body extraction device according to claim 3, wherein the locking portion comprises a second squeeze post, the second squeeze post is located in the second gland, and the distance of the second squeeze post is far away. The end forms a compression hole whose inner diameter gradually decreases from the distal end to the proximal end, and the locking chuck includes a movable portion at the proximal end, and the movable portion has at least two branches that can be opened and closed radially. During the movement of the second gland to the distal end, the movable part moves to the proximal end of the squeeze hole to clamp the push rod located in the movable part.
The intravascular foreign body extraction device according to claim 6, wherein a second seal is provided between the second squeeze column and the second gland, and the push rod passes through the middle of the second seal Then, when the second gland moves to the distal end, the second gland pushes a second seal, the second seal pushes the second squeeze post, and the second gland presses the The second seal is deformed so that the second seal can hold the push rod inside.
The device for removing foreign matter in a blood vessel according to claim 3, wherein the locking portion includes a second squeeze post, the second squeeze post is located in the second gland, and the inside of the second gland faces the lock The position of the clamping chuck forms a compression hole whose inner diameter gradually increases from the proximal end to the distal end. The locking chuck includes a movable portion at the proximal end, and the movable portion has at least two radially openable and closable openings. When the second gland is moved distally, the movable part moves toward the proximal end of the squeeze hole to clamp the push rod located in the movable part.
The intravascular foreign body extraction device according to claim 8, wherein a second seal is provided between the second squeeze column and the second joint, and the push rod passes through the middle of the second seal When the second pressing cover moves to the distal end, the second pressing cover pushes the locking chuck, the locking chuck pushes the second squeeze column, and the second squeeze column presses the The second seal is deformed so that the second seal can hold the push rod therein.
The intravascular foreign body extraction device according to claim 1, wherein the introduction sheath includes a connection part and a grip part, the connection part is located at a distal end of the introduction sheath, and the connection part and the outer sheath tube The connection is detachable, and the proximal end of the connection part is connected with the grip part.
The device for removing foreign matter in a blood vessel according to claim 10, wherein the connection portion includes a first joint and a first gland, and a distal end of the first joint is detachably connected to the outer sheath tube, and the first The proximal end of the joint is connected to the holding portion, and the distal end of the first gland is fixedly connected to the proximal end of the first joint.
The device for removing foreign matter in a blood vessel according to claim 11, wherein the connecting portion further comprises a first pressing post, and a proximal end of the first pressing post is fixedly connected to a distal end of the holding part, so that The first pressing post is located inside the proximal end of the first joint and is in contact with the first joint.
The device for removing foreign matter in a blood vessel according to claim 12, wherein the connection portion further comprises a first seal, the first seal is located between the first pressure column and the first joint for use To seal the connection between the two, the push rod passes through the first middle hole of the first seal.
The intravascular foreign body extraction device according to claim 13, wherein a step is formed on the outer side of the distal end of the first pressing column, and the first seal is provided on the platform surface of the step, and the first pressing column The distal end of the first compression member is compressed.
The device for removing foreign matter in a blood vessel according to any one of claims 2 to 14, wherein the holding portion includes a main body portion and a branch portion, and the branch portion is fixedly connected to or integrally formed with the main body portion, and the first A portion of the two channels is located in the main body portion, and the branch portion is hollow to form a branch channel, and the branch channel communicates with the second channel.
The device for removing foreign bodies in a blood vessel according to any one of claims 1 to 14, wherein the device for removing foreign bodies in a blood vessel further comprises a twist handle, and the twist handle is connected to the proximal end of the push rod to rotate the push rod through the twist handle Pole.
The device for removing foreign matter in a blood vessel according to any one of claims 1 to 14, wherein the capture ring includes an inner core and a covering layer, and the covering layer covers an outer side of the inner core.
The device for removing foreign matter in a blood vessel according to any one of claims 1 to 14, wherein the capture ring is made of a plurality of metal wires twisted and heat-set.
The intravascular foreign body extraction device according to any one of claims 1 to 14, wherein the outer sheath tube is made of high-density polyethylene.