CN211273061U

CN211273061U - Balloon catheter capable of improving puncture success rate

Info

Publication number: CN211273061U
Application number: CN201921236650.0U
Authority: CN
Inventors: 李成祥; 廉坤; 高好考; 陈根锐
Original assignee: Fourth Military Medical University FMMU
Current assignee: Fourth Military Medical University FMMU
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2020-08-18
Anticipated expiration: 2029-08-01

Abstract

The utility model discloses a can improve sacculus pipe of puncture success rate, this sacculus pipe are with axle type OTW sacculus pipe, include: outer tube, inner tube, sacculus, development ring, sharp end, pipe seat and sealing washer, wherein, the open angle of distal end is in 120 supplyes 180 degree within ranges after the sacculus expansion, and sealing washer fixed mounting is in the near-end of pipe seat, and the inner tube passes in the round hole of sealing washer, and the inner tube can move along the axial. The utility model discloses an useful part lies in: the action that the guide wire punctures the intima of the blood vessel is more accurate and effective, and then the balloon catheter can be ensured to smoothly enter the true lumen of the blood vessel, so that the guide wire entering the interlayer can smoothly return to the true lumen of the blood vessel again, thereby successfully opening the lesion which is failed in the previous treatment, improving the success rate of interventional therapy on chronic total occlusive lesion and benefiting more coronary heart disease patients.

Description

Balloon catheter capable of improving puncture success rate

Technical Field

The utility model relates to a sacculus pipe, concretely relates to can improve sacculus pipe of puncture success rate belongs to medical instrument technical field.

Background

Interventional techniques are a medical means developed in the later 70 s, and refer to a method of delivering interventional catheters or other interventional instruments to diseased regions through body lumens such as blood vessels for diagnostic imaging, treatment or tissue acquisition by percutaneous puncture or by directly using the original canals of the human body under the guidance of imaging medicine (such as X-ray, ultrasound, CT, MRI, etc.).

Percutaneous Transluminal Angioplasty (PTA) belongs to one of interventional techniques, and refers to a non-operative minimally invasive therapy in which after Percutaneous puncture, instruments such as a balloon catheter and a metal stent are conveyed to a diseased part through a blood vessel to perform treatments such as expansion and the like on the narrow and blocked diseased blood vessel so as to restore the narrow and blocked diseased blood vessel to be smooth.

Most of The existing PTA balloon catheters are integrally exchanged (OTW) balloon catheters, no hypotube is used as a support, and The catheters are made of soft materials.

The OTW balloon catheters can be roughly divided into the following two types according to the structure of the catheter:

(1) coaxial type: the inner tube and the outer tube are coaxially arranged and are provided with a circular wire guide cavity and an annular filling cavity;

(2) non-coaxial type: the inner tube and the outer tube are arranged non-coaxially and are provided with a circular thread guide cavity and a crescent filling cavity.

In the treatment of coronary heart disease, interventional therapy is the most common method, and an OTW balloon catheter of the coaxial type is the most common balloon catheter.

Most of the existing coaxial OTW balloon catheters have the structure of the balloon shown in fig. 1, that is, after the balloon 3 is expanded, the distal end of the balloon 3 protrudes forward and is approximately conical.

In China, about 15% -20% of patients with coronary heart disease are chronic total occlusive lesions, when the existing balloon catheter is used for interventional therapy, because the far end of the balloon 3 is approximately conical and the material of the catheter is soft, a guide wire can easily enter a sandwich layer at the occlusion part of a blood vessel and cannot enter the true cavity of the blood vessel, which is the most main reason for interventional failure, and the opening rate of the current chronic total occlusive lesions is only 70% -80%.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model aims to provide a balloon catheter which can improve the puncture success rate.

In order to achieve the above object, the utility model adopts the following technical scheme:

a balloon catheter capable of improving puncture success rate, which is a coaxial OTW balloon catheter, comprises: outer tube, inner tube, sacculus, development ring, point end and pipe seat, its characterized in that still includes: a seal ring, wherein:

the outer tube and the inner tube are coaxially arranged, the near end of the outer tube is fixedly connected with the far end of the catheter holder, and the far end of the outer tube is fixedly connected with the near end of the balloon;

the far end of the saccule is fixedly connected with the far end of the inner tube, the developing ring is sleeved on the inner tube and is positioned in the saccule, the tip head is arranged at the far end of the inner tube, and the opening angle of the far end after the saccule is expanded is within the range of 120 degrees and 180 degrees;

the sealing ring is fixedly arranged at the near end of the catheter seat, the inner tube penetrates through the round hole of the sealing ring, and the inner tube can move along the axial direction.

The balloon catheter capable of improving the puncture success rate is characterized in that the balloon is a compliant balloon which can be expanded under a lower pressure and is preferably made of soft pebax or PU.

The balloon catheter capable of improving the puncture success rate is characterized in that the length of the tip is 1-2 mm.

The utility model discloses an useful part lies in: the opening angle of the far end of the balloon after expansion is within the range of 120-180 degrees, so the intima of the blood vessel jacked up by the balloon is approximately vertical to the blood vessel wall, and the inner tube can move along the axial direction, so the intima of the blood vessel jacked up after the inner tube retracts is closer to the balloon, the intima of the blood vessel positioned right in front of the pointed end is still approximately vertical to the blood vessel wall under the supporting effect of the far end of the balloon and has shorter distance (which is more favorable for successful guide wire puncture), so the action of the guide wire puncturing the intima of the blood vessel is more accurate and effective, and the balloon catheter is further ensured to smoothly enter the true lumen of the blood vessel, so the guide wire entering the interlayer can smoothly return to the true lumen of the blood vessel, the lesion failed in the prior treatment is successfully opened, the success rate of interventional treatment of chronic complete.

Drawings

Fig. 1 is a schematic structural view of a balloon portion of a conventional balloon catheter;

fig. 2 is a schematic structural view of a balloon catheter provided by the present invention before balloon dilatation;

fig. 3 is a schematic structural view of the balloon catheter provided by the present invention after balloon expansion;

fig. 4 is a schematic view of the balloon catheter provided by the present invention after balloon dilatation in a blood vessel;

fig. 5 is a schematic view of the balloon catheter provided by the present invention after the balloon is retracted in the blood vessel.

The meaning of the reference symbols in the figures: 1-outer tube, 2-inner tube, 3-sacculus, 4-developing ring, 5-tip, 6-catheter seat, 7-sealing ring and 8-blood vessel intima.

Detailed Description

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

Referring to fig. 2 and fig. 3, the utility model provides a can improve sacculus pipe of puncture success rate is coaxial type OTW sacculus pipe, include: outer tube 1, inner tube 2, sacculus 3, development ring 4, pointed end 5, pipe seat 6 and sealing washer 7.

The outer tube 1 and the inner tube 2 are coaxially arranged, the near end of the outer tube 1 is fixedly connected with the far end of the catheter holder 6, and the far end of the outer tube 1 is fixedly connected with the near end of the balloon 3.

The far end of the sacculus 3 is fixedly connected with the far end of the inner tube 2, the developing ring 4 is sleeved on the inner tube 2 and is positioned in the sacculus 3, the pointed tip 5 is arranged at the far end of the inner tube 2, and the opening angle alpha of the far end is within the range of 180 degrees after the sacculus 3 is expanded.

The sealing ring 7 is fixedly arranged at the proximal end of the catheter seat 6, the inner tube 2 penetrates through a circular hole of the sealing ring 7, and the inner tube 2 can move along the axial direction.

Preferably, the balloon 3 is a compliant balloon that can be expanded at relatively low pressures.

More preferably, the balloon 3 is made of pebax or PU which is soft, and when the balloon lifts the intima 8 of the blood vessel, the balloon does not have serious influence on other blood vessel tissues, so that the damage of the balloon catheter to the blood vessel wall can be reduced.

Preferably, the length of the tip head 5 is 1-2mm, which is shorter than the conventional tip head, so as to shorten the distance between the jacked vascular intima 8 and the guide wire cavity, and facilitate the successful guide wire puncture.

The utility model provides a can improve the application method of sacculus pipe of puncture success rate as follows:

when a guide wire enters a vascular dissection at a focus of a blood vessel, a balloon catheter is conveyed into a false cavity of the vascular dissection at the focus along the guide wire, contrast agent is injected into a filling cavity through a catheter seat 6, so that a balloon 3 is expanded and jacks up an endovascular 8 (shown in figure 4), the endovascular 8 is approximately vertical to the blood vessel wall, then the endovascular 2 is withdrawn, so that the balloon 3 which is positioned at the far end and fixedly connected with the far end is retracted along the endovascular 2, meanwhile, the pressure of the balloon 3 is moderately relieved, the jacked-up endovascular 8 is closer to the balloon 3, the endovascular 8 which is positioned right in front of a tip 5 is still approximately vertical to the blood vessel wall (shown in figure 5), and the balloon catheter is parallel to the blood vessel wall, so that the guide wire in the guide wire cavity is approximately vertical to the endovascular 8 which is positioned right in front of the tip 5 and has a shorter distance (which is more favorable for successful guide wire puncture), the guide wire in the guide wire cavity penetrates out from the tip end 5 and pierces the vascular intima 8 close to the balloon 3, then the balloon 3 is completely decompressed, the decompressed balloon 3 penetrates out of the hole of the vascular intima 8 and enters the vascular true cavity, and then the endovascular intervention treatment is carried out according to the normal procedure.

Referring to fig. 5, because the jacked-up intima 8 of the blood vessel is closer to the balloon 3, the intima 8 of the blood vessel positioned right in front of the tip 5 is still approximately perpendicular to the blood vessel wall under the supporting action of the far end of the balloon 3 and has shorter distance (more favorable for the success of guide wire puncture), so that the action of the guide wire puncturing the intima 8 of the blood vessel is more accurate and effective, and the balloon catheter is further ensured to smoothly enter the true lumen of the blood vessel.

It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A balloon catheter capable of improving puncture success rate, which is a coaxial OTW balloon catheter, comprises: outer tube (1), inner tube (2), sacculus (3), development ring (4), pointed end (5) and pipe seat (6), its characterized in that still includes: a seal ring (7), wherein:

the outer tube (1) and the inner tube (2) are coaxially arranged, the near end of the outer tube (1) is fixedly connected with the far end of the catheter seat (6), and the far end of the outer tube (1) is fixedly connected with the near end of the balloon (3);

the far end of the balloon (3) is fixedly connected with the far end of the inner tube (2), the developing ring (4) is sleeved on the inner tube (2) and is positioned in the balloon (3), the pointed end (5) is installed at the far end of the inner tube (2), and the opening angle of the far end is within the range of 180 degrees after the balloon (3) is expanded;

the sealing ring (7) is fixedly arranged at the near end of the catheter seat (6), the inner tube (2) penetrates through a round hole of the sealing ring (7), and the inner tube (2) can move along the axial direction.

2. A balloon catheter according to claim 1, characterized in that the balloon (3) is a compliant balloon, expandable under low pressure.

3. A balloon catheter for improving the success rate of puncture according to claim 2, characterized in that the balloon (3) is made of pebax or PU with soft texture.

4. The balloon catheter capable of improving the puncture success rate according to claim 1, wherein the length of the tip (5) is 1-2 mm.