CN113729858B

CN113729858B - Micro-guide wire for capturing foreign matters in blood vessel and conveying guide pipe

Info

Publication number: CN113729858B
Application number: CN202111151470.4A
Authority: CN
Inventors: 王利
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2023-11-07
Anticipated expiration: 2041-09-29
Also published as: CN113729858A

Abstract

The invention discloses a micro-guide wire for capturing foreign matters in blood vessels and conveying a catheter, which comprises the following components: the outer guide wire comprises an outer guide wire and an inner guide wire, one end of the outer guide wire is fixedly connected with a control handle, the other end of the outer guide wire is in contact with the outer guide wire which is not fixedly connected with the head end, the inner guide wire is placed on the inner side of the outer guide wire in a sliding mode, and a surrounding section is arranged on the inner guide wire close to the outer guide wire end of the head end. A technology is provided for manually controlling the flexible distal end of a micro-guide wire to form a loop, which can more easily pass through a foreign object to reach a distal target position and take out the foreign object. Meanwhile, the guide wire can be clung to the wall of the blood vessel after the distal end forms a loop, so that a certain supporting force is provided, and the micro-catheter can smoothly reach the distal end target position.

Description

Micro-guide wire for capturing foreign matters in blood vessel and conveying guide pipe

Technical Field

The invention relates to the field of medical appliances, in particular to a micro-guide wire for capturing foreign matters in blood vessels and conveying a catheter.

Background

Currently endovascular interventions are widely used for heart and cerebral blood diseases. In the course of therapeutic practice, removal of intravascular foreign bodies is a practical problem often faced by doctors, such as intravascular pull-bolts, removal of escape coils, and the like. The current tools for removing foreign matters commonly used in clinic comprise a bracket, a balloon and the like, and other skills. These approaches have in common that a microcatheter is required to pass through the foreign body to the distal vessel and then complete removal of the foreign body with the microcatheter engaged. However, when the micro-catheter is in a tiny blood vessel or encounters some special foreign matters, the micro-catheter is difficult to pass through the foreign matters, and the micro-catheter is a common cause of operation failure. In addition, in the course of aneurysm treatment of some tortuous vessels, insufficient support of the microcatheter often occurs, resulting in failure of the microcatheter to cross the neck of the aneurysm or protrude into the aneurysm, resulting in surgical failure and even rupture of the aneurysm with serious adverse consequences.

The materials for removing foreign matters commonly used at present are a bracket, a balloon and the like. Patent net discloses the invention: a spring ring escape capturing device mainly comprises a micro-guide wire head end tied to a micro-guide tube head end for taking out an escape spring ring. The current methods have a commonality, namely, the micro-catheter is required to reach the distal blood vessel through the foreign matter, the difficulty of the micro-catheter passing through the foreign matter is one of the main reasons for treating failure, and no scheme for directly taking out the foreign matter by utilizing the micro-guide wire is known at present.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a micro-guide wire for capturing intravascular foreign matters and conveying a catheter, and provides a technology capable of manually controlling the flexible distal end of the micro-guide wire to form a loop, so that the micro-guide wire can more easily reach a distal end target position through the foreign matters and take out the foreign matters. Meanwhile, the guide wire can be clung to the wall of the blood vessel after the distal end forms a loop, so that a certain supporting force is provided, and the micro-catheter can smoothly reach the distal end target position.

In order to achieve the aim of the invention, the invention adopts the following technical scheme:

a microcatheter for intravascular foreign body capture and catheter delivery comprising: the outer guide wire comprises an outer guide wire and an inner guide wire, one end of the outer guide wire is fixedly connected with a control handle, the other end of the outer guide wire is in contact with the outer guide wire which is not fixedly connected with the head end, the inner guide wire is placed on the inner side of the outer guide wire in a sliding mode, and a surrounding section is arranged on the inner guide wire close to the outer guide wire end of the head end.

Preferably, the surrounding section is located at a position where the head end outer guide wire contacts the outer guide wire, and the inner guide wire can be placed outside the outer guide wire when the inner guide wire is pulled.

The beneficial effects of the invention are as follows:

a technology is provided for manually controlling the flexible distal end of a micro-guide wire to form a loop, which can more easily pass through a foreign object to reach a distal target position and take out the foreign object. Meanwhile, the guide wire can be clung to the wall of the blood vessel after the distal end forms a loop, so that a certain supporting force is provided, and the micro-catheter can smoothly reach the distal end target position.

Solves the problem that the micro-catheter is difficult to smoothly cross over the foreign matters, so that the treatment fails; solves the problem that the prior microcatheter can not provide effective support so that the microcatheter can not reach the ideal position of the far end; solves the problems of high cost, difficult operation and high failure rate of the existing tool.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of a first method of use of the microcatheter of the present invention;

FIG. 3 is a schematic view of a second use of the microcatheter of the invention;

FIG. 4 is a schematic view of a third use of the microcatheter of the present invention;

reference numeral control table:

1-control handle, 2-outer guide wire, 3-inner guide wire, 4-head end outer guide wire, 5-surrounding section, 6-vascular wall, 7-microcatheter and 8-foreign matter in the tube.

Detailed Description

Specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1 to 4, a microcatheter for capturing and delivering an intravascular foreign substance, comprising: the outer guide wire 2 and the inner guide wire 3, outer guide wire 2 one end fixed connection control handle 1, outer guide wire 2 other end contact is fixed connection head end outer guide wire 4 not, outer guide wire 2 inboard slides and places inner guide wire 3, inner guide wire 3 is close to the outer guide wire 4 end of head end and is equipped with around section 5.

The surrounding section 5 is positioned at the contact position of the head end outer guide wire 4 and the outer guide wire 2, and when the inner guide wire 3 is pulled, the inner guide wire 3 can be placed outside the outer guide wire 4.

The other end of the outer guide wire 2 is in contact with the outer guide wire 4 at the non-fixed connection head end: in certain situations, the outer guide wire may not be withdrawn from the vessel when it is pulled taut and looped, and the inner guide wire may be manually broken, and the distal loop may lose its traction and be easily pulled out of the body.

Example 1: as shown in fig. 2: first use of microcatheter: when there is an in-tube foreign matter 8 (such as thrombus, spring coil, etc.) in the vessel wall 6, the outer guide wire has a softer texture, when the inner guide wire is drawn out and shortened, the outer guide wire can be curled in the vessel to form a loop, and the loop is attached to the vessel wall, at this time, the inner guide wire and the outer guide wire are drawn back simultaneously, the vascular foreign matter is clamped at the microcatheter 7, and then the vascular foreign matter, the inner guide wire, the outer guide wire, the microcatheter, etc. are all drawn out of the body together.

Example 2: as shown in fig. 3: second use of microcatheter: when the inner guide wire 3 and the outer guide wire 2 in the invention form a closed ring or loop in the blood vessel together, the other micro guide wire 9 passes through the ring or the loop, then the micro guide wire 2 is retracted and matched with the micro guide tube, the micro guide wire 9 can be locked at the head end of the micro guide tube, a new closed ring is formed, the foreign matter is lashed in the ring, and then the guide wire guide tube system is rotated, so that the foreign matter is tightly wound, and the guide wire and the guide tube system are retracted and pulled out of the body together with the foreign matter.

Example 3: as shown in fig. 4: third use of microcatheter: the outer guide wire 2 and the inner guide wire 3 are used as supporting guide wires to convey the microcatheter stent catheter, when the inner guide wire 3 is retracted, the outer guide wire 2 is curled in a blood vessel, the curled part is clung to the wall of the blood vessel to increase friction force, the outer guide wire is properly retracted, at the moment, the outer guide wire can form a certain tension in the blood vessel, and sufficient supporting force is provided for the microcatheter in the process of conveying the microcatheter along the microcatheter 2 so as to ensure that the microcatheter can smoothly pass through the neck of the aneurysm to reach the far-end blood vessel, avoid the microcatheter from protruding into the aneurysm cavity 10 to cause rupture and bleeding of the aneurysm, effectively improve the success rate of operation, and reduce complications such as rupture and bleeding of the aneurysm.

The hardness of the head end of the guide wire is different from that of the lower part of the guide wire, the head end is soft, the vascular injury in the operation process can be avoided, and the lower part is harder, so that the operation is convenient. The outer diameter of the inner guide wire control handle is the same as that of the outer guide wire, and the tension of the control handle and the outer guide wire can be controlled by a torsion controller; the guide wires are thin, the memory is rebound, the angle is not easy to form, the coating is smooth, and the connecting parts of the inner guide wires and the outer guide wires at the head end can be separated.

The above description is illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, but is to be accorded the full scope of the claims.

Claims

1. A microcatheter for intravascular foreign body capture and catheter delivery comprising: an outer guide wire (2) and an inner guide wire (3),

one end of the outer guide wire (2) is fixedly connected with the control handle (1), the other end of the outer guide wire (2) is in contact with the outer guide wire (4) at the head end which is not fixedly connected with the outer guide wire, the inner guide wire (3) is placed on the inner side of the outer guide wire (2) in a sliding mode, and a surrounding section (5) is arranged at the end, close to the outer guide wire (4) at the head end, of the inner guide wire (3);

the surrounding section (5) is positioned at the contact position of the head end outer guide wire (4) and the outer guide wire (2), and when the inner guide wire (3) is pulled out, the inner guide wire (3) is arranged at the outer side of the head end outer guide wire (4);

when the inner guidewire is withdrawn externally, the outer guidewire may buckle within the vessel for pulling the occlusion at its distal end.