CN218961565U - Single-cavity microcatheter with front fixed guide wire and rear side hole - Google Patents

Abstract

The utility model relates to a single-cavity microcatheter with a front fixed guide wire and a rear side hole, belonging to the technical field of medical appliances. One end of the single-cavity microcatheter, which is far away from an operator, is provided with a section of guide wire I which extends outwards; one end of the single-cavity microcatheter, which is far away from an operator, is a hollow closed end, and the hollow closed end is provided with an expanding part; a guide structure for guiding the guide wire to change the advancing direction is arranged in the cavity channel in the expanding part; a side hole facing one end of the operator is arranged on the side wall of the expansion part, and the side hole is communicated with a cavity channel of the single-cavity microcatheter; the single-cavity microcatheter section adjacent to the expanding section is a rod body of the single-cavity microcatheter. The utility model provides an interventional instrument which can safely, effectively and rapidly smoothly send the guide wire into the branch vessel.

Description

Single-cavity microcatheter with front fixed guide wire and rear side hole

Technical Field

The utility model relates to a single-cavity microcatheter with a front fixed guide wire and a rear side hole, belonging to the technical field of medical appliances.

Background

PCI (percutaneous coronary intervention, percutaneous coronary intervention, PCI) is an important tool for current coronary heart disease treatment. Proper selection and manipulation of the guidewire through the stenosed or occluded site to the distal end of the vessel provides a "track" for subsequent instruments into the diseased vessel such as balloons, stents, ultrasound catheters, rotating grinding heads, etc., which is a necessary condition for PCI success. A bifurcated lesion of a coronary artery refers to an opening of a coronary artery that borders and/or involves an important branch vessel. Atherosclerosis is easy to occur at the bifurcation of blood vessels due to the increase of blood flow vortex and shear force, and different bifurcation lesions can be seen in the interventional diagnosis and treatment work of clinical coronary heart disease due to the fact that the disease affects different parts of main blood vessels and/or branch blood vessels and different stenosis degrees. According to the study statistics of ARTS, SYNTAX and the like, coronary artery bifurcation lesions account for about 15% -20% of coronary artery lesions of interventional therapy, and each bifurcation lesion has the characteristics of unique bifurcation angle, blood vessel diameter, plaque distribution and the like. There are various typing schemes for bifurcation lesions, and handling bifurcation lesions requires higher handling of the guide wire; the complexity and diversity of bifurcation lesions increases the difficulty of PCI surgery, multiple intraoperative variables, low success rate, long surgery time, high contrast agent dosage, and high occurrence rate of complications and adverse cardiac events.

At present, a proper guide wire such as a general guide wire, a stiffening guide wire, a hydrophilic polymer coating guide wire or a tip guide wire is often selected according to pathological change characteristics in the prior art, and the guide wire is molded into various shapes such as a short single bend, a long single bend, a single wide large bend or a double bend by matching with the head end, so that the guide wire smoothly enters a branch vessel through a forward operation technology; when it is difficult for a guide wire to enter a highly angled branch vessel, attempts can be made to utilize balloon assist techniques, reverse guide wire techniques, dual lumen microcatheter with hydrophilic coating guide wire modified reverse guide wire techniques, and the like; the defects of the prior art are mainly expressed in that: 1. the ability to provide lateral bending of the guide wire in the prior art is limited, particularly the guide wire cannot be advanced in the opposite direction beyond 90 degrees; 2. the guide wire reverse folding shaping technique and the dual-cavity microcatheter combined operation in the reverse rotation technique have extremely high requirements on operators, long learning curve and high complication occurrence rate; 3. according to the parallelogram rule, after entering the angled branch vessel, various performance indexes such as the pushability of the guiding guide wire are obviously attenuated, and the success rate is reduced; 4. the double-cavity microcatheter has good supporting force, flexible guide wire exchange and larger outer diameter, and 7F guide catheter is required to be matched for application, so that peripheral arterial injury is increased or the use opportunity of the radial arterial approach is limited; 5. the outer diameter of the special single-cavity microcatheter is smaller but the supporting force is poorer, and the success rate of clinical practice is lower; 6. in the reversal technique, the use of hydrophilic coated guide wires is more risky than general-purpose guide wires to damage the blood vessel.

Therefore, there is a need in the art for an auxiliary interventional instrument that can safely, effectively and quickly deliver a guidewire smoothly into an extremely angled branch vessel; the instrument should have the following functions: 1. the lateral bending capability can be provided for the universal guide wire, and particularly, the forward motion capability can be provided for the opposite direction, so that the reverse motion of the guide wire in the reversing technology is changed into the forward motion of the guide wire in the conventional operation; 2. providing stronger forward supporting force, avoiding pushing attenuation and being beneficial to pushing the universal guide wire into the branch vessel; 3. all operations are completed by replacing the hydrophilic coating guide wire with the universal guide wire, so that the risk of vascular injury is reduced; 4. the function of an integral exchange cavity is realized, so that flexible exchange of the guide wire is facilitated; 5. the single-cavity microcatheter has the advantage of small occupied space, and plays roles of the 6F guiding catheter in radial artery approach, compatibility with other instruments, saccule anchoring and withdrawing and the like.

Disclosure of Invention

The utility model aims to solve the technical problem of how to obtain an auxiliary interventional instrument capable of safely, effectively and rapidly smoothly feeding a guide wire into a branch vessel.

In order to solve the problems, the technical scheme adopted by the utility model is to provide a single-cavity microcatheter with a front fixed guide wire and a rear side hole, wherein one end of the single-cavity microcatheter far away from an operator is provided with a section of guide wire I extending outwards; one end of the single-cavity microcatheter, which is far away from an operator, is a hollow closed end, and the hollow closed end is provided with an expanding part; a guide structure for guiding the guide wire to change the advancing direction is arranged in the cavity channel in the expanding part; a side hole facing one end of the operator is arranged on the side wall of the expansion part, and the side hole is communicated with a cavity channel of the single-cavity microcatheter; the single-cavity microcatheter section adjacent to the expanding section is a rod body of the single-cavity microcatheter.

Preferably, the first guide wire is arranged to extend outwards along the length direction of the single-cavity micro-catheter; the guide wire I and the single-cavity micro-catheter are of an integrated structure.

Preferably, the outer diameter of the single-cavity microcatheter is gradually reduced from the expansion part to a rod body part close to one end of an operator.

Preferably, the side hole is an oval opening; the major axis of the oval opening is along the length of the single-lumen microcatheter.

Preferably, one end of the rod body close to the expansion part is provided with a developing mark.

Preferably, a cavity for accommodating a second guide wire entering the branch vessel is formed in the expansion part, and an arc-shaped surface for guiding the guide wire to reversely rotate backwards is formed at one end of the cavity away from an operator.

Preferably, the outer diameter of the enlarged portion is 0.93mm.

Preferably, the arcuate surface has a diameter of 0.62mm.

Preferably, the outer diameter of the rod body of the single-cavity microcatheter is 0.76mm; the inner diameter of the single-cavity micro-catheter is gradually changed from 0.62mm of the expansion part to 0.45mm of the rod body part.

Compared with the prior art, the utility model has the following beneficial effects:

1. the opening rear direction of the oval side hole can provide larger lateral and even reverse bending capability for the universal guide wire, so that the technical process of reversing the guide wire is simplified; 2. the support force and the pushing property of the guide wire are enhanced by virtue of the microcatheter, so that the technical operation difficulty of the reverse guide wire is reduced; 3. reducing complications and surgery time; 4. the maximum outer diameter of the enlarged head end of the microcatheter is only 0.93mm (2.8F), which still belongs to the category of single-cavity microcatheters, occupies little space, and is convenient for anchoring and withdrawing the balloon and is compatible with other instruments when being applied in a guiding catheter of 1.87mm (6F).

Drawings

FIG. 1 is a schematic view of the main components of the present utility model.

Reference numerals: 1. a guide wire I; 2. a second guide wire; 3. a side hole; 4. a microcatheter; 5. an inner cavity; 6. a tail end handle; 7. developing the mark; 8. a main vessel proximal segment; 9. a main vessel distal segment; 10. branching blood vessels; 11. atherosclerotic plaques; 12. an expanding section; 13. a rod body.

Detailed Description

In order to make the utility model more comprehensible, preferred embodiments accompanied with the accompanying drawings are described in detail as follows:

as shown in fig. 1, the utility model provides a single-lumen micro-catheter with a front fixed guide wire and a rear side hole, which comprises a single-lumen micro-catheter 4, wherein one end of the single-lumen micro-catheter 4, which is far away from an operator, is provided with a section of guide wire 1 which extends outwards; the end of the single-cavity micro-catheter 4, which is far away from an operator, is a hollow closed end, and the hollow closed end is provided with an expanding part 12; a guide structure for guiding the guide wire to change the advancing direction is arranged in the cavity channel inside the expansion part 12; the side wall of the expansion part 12 is provided with a side hole 3 facing one end of an operator, and the side hole 3 is communicated with a cavity channel of an inner cavity 5 of the single-cavity micro-catheter 4; the section of the single-lumen microcatheter adjacent to the enlarged portion 12 is the shaft portion 13 of the single-lumen microcatheter. The first guide wire 1 is arranged to extend outwards along the length direction of the single-cavity micro-catheter 4; the first guide wire 1 and the single-cavity micro-catheter 4 are of an integrated structure. The outer diameter of the single-lumen microcatheter 4 is gradually reduced from the enlarged portion 12 to the shaft portion 13 near the end of the operator. The side hole 3 is an oval opening; the major axis of the oval opening is along the length of the single-lumen microcatheter 4. The end of the rod body 13 near the expansion portion 12 is provided with a developing mark 7. The interior of the expansion part 12 is provided with a cavity for accommodating the second guide wire 2 entering the branch vessel 10, and one end of the cavity away from an operator is provided with an arc-shaped surface for guiding the second guide wire 2 to reversely rotate backwards. The outer diameter of the enlarged portion 12 is 0.93mm. The diameter of the arc surface is 0.62mm. The outer diameter of the rod body part 13 of the single-cavity micro-catheter 4 is 0.76mm; the inner diameter of the single-lumen microcatheter 4 was set to gradually change from 0.62mm of the enlarged portion 12 to 0.45mm of the shaft portion 13.

Examples

The utility model provides a single-cavity microcatheter with a rear-facing side hole, which is used for assisting a guide wire to quickly and effectively enter a front fixed guide wire of an extremely angled branch vessel.

The single-cavity micro-catheter 4 is guided by the preposed guide wire 1 to advance from the main blood vessel proximal section 8 to the main blood vessel distal section 9; up to near the branch vessel 10; the wall of the branch vessel 10 is provided with a plurality of atherosclerosis plaques 11;

the diameter of the front guide wire 1 is 0.36mm, and the whole length is 30mm; is not transparent to radiation; the head end of the front guide wire 1 can be bent and shaped slightly and is responsible for guiding the whole micro-catheter system into a main blood vessel, and the tail end 2.70mm of the front guide wire 1 is embedded into the head end of the blunt taper micro-catheter 4, so that the front guide wire and the blunt taper micro-catheter are integrated;

the inside of the head end of the micro-catheter 4 is a blind end and is an arc shallow concave surface, the inner diameter of the concave surface is 0.62mm, the depth is 0.30mm, an elliptical side hole 3 with the size of 0.70mm multiplied by 0.45mm is arranged on the pipe wall at one side of the head end of the micro-catheter 4, the outer diameter of the head end expansion part 12 of the micro-catheter 4 is transited from 0.93mm (2.8F) to 0.76mm (2.3F) of the outer diameter of the rod part 13 along the length range of 0.70mm of the long axis of the elliptical side hole 3, the inner diameter of the corresponding micro-catheter 4 is gradually changed from 0.62mm to 0.45mm, the thickness of the outer wall of the micro-catheter 4 is kept to be 0.15mm, and a developing marking ring 7 with the width of 0.30mm is arranged at the beginning of the rod part 13 of the micro-catheter 4;

the gradual taper of the inner diameter of the micro-catheter 4 is skillfully combined with the shallow concave surface of the inner blind end of the head end expanding part 12, so that the structural characteristic that the long axis of the oval side hole 3 forms an acute angle with the main axis of the micro-catheter 4 is promoted, and the purpose of opening the oval side hole 3 is achieved. The oval side hole 3 is communicated with the inner cavity of the main body of the micro-catheter 4 with the circular cross section and the inner diameter of 0.45mm, and the length of the center of the oval side hole 3 from the handle 6 at the tail end of the micro-catheter is 1350mm.

When in use, the 1800mm length universal guide wire II 2 is sent from the tail end of the micro-catheter 4, quickly sent to the outlet of the oval side hole 3 along the inner cavity 5 of the main body of the micro-catheter 4, the rear direction side hole 3 of the micro-catheter 4 is adjusted to be aligned with the opening of the branch vessel 10, the guide wire II 2 is continuously sent to enter the branch vessel 10, the most difficult step that the guide wire enters the extremely angled branch vessel in the bifurcation lesion PCI is completed, the whole device is withdrawn from the body through the guide wire prolonging method or the saccule anchoring technology, and then sent to equipment such as a saccule, a bracket, an ultrasonic catheter, a rotary grinding head and the like along the guide wire remained in the branch vessel, and finally the PCI operation is completed.

The utility model integrates the commonly used guide wire and the single-cavity microcatheter into an integrated structure, not only plays the traditional classical function that the prepositive guide wire can guide the whole system into the main blood vessel in the bifurcation lesion, but also utilizes the structural characteristics of the concave spherical surface of the blind end and the rear orientation of the oval side hole in the head end of the single-cavity microcatheter to assist in pushing the general guide wire into the extremely angled branch blood vessel smoothly; the joint of the oval side hole, the inner cavity of the micro-catheter main body and the tail end of the micro-catheter is in smooth transition, and no acute angle crease is formed in the whole channel system, so that the fed guide wire is ensured not to bend. The materials and fabrication processes used for the integrated structure remain the same as for a single guide wire and single lumen microcatheter. The outer wall surface of the micro-catheter is coated with a polymer hydrophilic coating, so that the micro-catheter has good trafficability, and the inner cavity of the micro-catheter is a hydrophobic coating, so that the inner guide wire can pass through or exchange more smoothly, and the like.

The utility model combines the diameter taper change of the micro-catheter, the concave spherical surface of the blind end in the head end of the micro-catheter and the structure characteristic of the opening rear orientation of the oval side hole, and assists in pushing the universal guide wire into the extremely angled branch vessel smoothly.

While the utility model has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims. Equivalent embodiments of the present utility model will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the utility model; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims (9)

1. A single-cavity micro-catheter with a front fixed guide wire and a rear side hole, which is characterized in that one end of the single-cavity micro-catheter far away from an operator is provided with a section of guide wire I extending outwards; one end of the single-cavity microcatheter, which is far away from an operator, is a hollow closed end, and the hollow closed end is provided with an expanding part; a guide structure for guiding the guide wire to change the advancing direction is arranged in the cavity channel in the expanding part; a side hole facing one end of the operator is arranged on the side wall of the expansion part, and the side hole is communicated with a cavity channel of the single-cavity microcatheter; the single-cavity microcatheter section adjacent to the expanding section is a rod body of the single-cavity microcatheter.

2. A single lumen microcatheter with both a pre-fixation guidewire and a posteriorly facing side hole as in claim 1, wherein the guidewire is configured to extend outwardly along the length of the single lumen microcatheter; the guide wire I and the single-cavity micro-catheter are of an integrated structure.

3. A single lumen microcatheter with both a pre-fixation guide wire and a posteriorly facing side hole as in claim 1, wherein the outer diameter of the single lumen microcatheter tapers from the enlarged portion to a shaft portion near the end of the operator.

4. A single lumen microcatheter with a posteriorly facing side hole in combination with a pre-fixation guidewire as in claim 1, wherein the side hole is an oval opening; the major axis of the oval opening is along the length of the single-lumen microcatheter.

5. The single-lumen microcatheter with both a front fixed guide wire and a rear facing side hole of claim 1 wherein the end of the shaft portion adjacent the enlarged portion is provided with a development mark.

6. The single-lumen microcatheter with both a pre-fixed guide wire and a backward-facing side hole according to claim 1, wherein the interior of the enlarged portion is provided with a lumen for accommodating a second guide wire entering a branch vessel, and one end of the lumen, which is far away from an operator, is provided with an arc-shaped surface for guiding the guide wire to reversely rotate backward.

7. A single lumen microcatheter with both a pre-fixation guidewire and a posteriorly facing side hole as in claim 6, wherein the enlarged portion has an outer diameter of 0.93mm.

8. A single lumen microcatheter with both a pre-fixation guidewire and a posteriorly facing side hole as in claim 7, wherein the arcuate surface has a diameter of 0.62mm.

9. The single lumen microcatheter with both a pre-fixation guidewire and a posteriorly facing side hole of claim 8, wherein the outer diameter of the shaft portion of the single lumen microcatheter is 0.76mm; the inner diameter of the single-cavity micro-catheter is gradually changed from 0.62mm of the expansion part to 0.45mm of the rod body part.

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