Guiding catheter for bifurcated blood vessel

Abstract

The invention relates to the technical field of medical instruments, in particular to a guiding catheter for bifurcated blood vessels, the bifurcated blood vessels comprise diseased blood vessels and non-diseased blood vessels, the diseased blood vessels and the non-diseased blood vessels are communicated with each other, and the guiding catheter comprises a catheter body and a positioning part arranged at the far end of the catheter body. A positioning guide wire slidably penetrates through the positioning piece to enter the non-lesion blood vessel, the far-end part of the tube body enters the lesion blood vessel, and the positioning guide wire and the far-end part of the tube body form an included angle at the bifurcation of the bifurcated blood vessel, so that the positioning guide wire is clamped at the bifurcation of the blood vessel, powerful support is provided for the far-end part of the guide catheter, and the guide catheter can be used for guiding the non-lesion blood vessel and the lesion blood vessel. The guide catheter can be anchored conveniently, and unexpected displacement of the guide catheter is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a guiding catheter for bifurcated blood vessels. Background Art

[0002] With the development of minimally invasive vascular interventional medical technology, guide catheters have been widely used in various vascular interventional surgeries. Guide catheters are the basic transmission track in vascular interventional surgery. They have the functions of conveying and supporting the application of various interventional devices (such as guidewires, balloons, stents, etc.), injecting contrast agents and related treatments, and rescue drugs. They are one of the decisive factors for the success of vascular interventional treatment.

[0003] Existing guide catheters generally have a tube body whose softness gradually decreases from the distal end to the proximal end. The highly soft distal end can facilitate the guide catheter to enter tortuous blood vessels, and the harder proximal end can provide good support and better transmit the operator's pushing force.

[0004] However, the existing guide catheters have the disadvantage that when the instrument is pushed in the guide catheter for use or when injecting drugs, a reaction force will be generated on the guide catheter, driving the guide catheter to withdraw toward the proximal end. At this time, the friction between the guide catheter and the blood vessel and the rigidity of the catheter body itself can only be used to offset the withdrawal force. The friction between the guide catheter and the blood vessel and the rigidity of the catheter body itself provide limited anchoring force. Therefore, the guide catheter is prone to displacement during the surgical operation, especially when a section of the distal end of the guide catheter enters the bifurcated blood vessel, the anchoring force is smaller, and it is more likely to be displaced, and even the distal end of the guide catheter slips out of the bifurcated blood vessel, affecting the surgical operation. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a guide catheter for bifurcated blood vessels, which improves the support of the distal end of the guide catheter by providing a positioning member and using a positioning guidewire to change the position of the guide catheter support point.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A guide catheter for a bifurcated blood vessel, the bifurcated blood vessel comprising a diseased blood vessel connected to each other and a non-diseased blood vessel connected to the diseased blood vessel, the guide catheter comprising a tube body, a positioning piece arranged at the distal end of the tube body, and a positioning guide wire, the positioning guide wire can slidably pass through the positioning piece and enter the non-diseased blood vessel, the distal end of the tube body enters the diseased blood vessel, and the positioning guide wire and the distal end of the tube body form an angle at the bifurcation of the bifurcated blood vessel.

[0008] In one embodiment, the positioning member is fixedly connected to the tube body, and the distance between the distal end of the positioning member and the distal end of the tube body is 0-30 cm. Preferably, the distance between the distal end of the positioning member and the distal end of the tube body is 10-30 cm, or the distance between the distal end of the positioning member and the distal end of the tube body is 0-15 cm.

[0009] In one embodiment, the positioning member is in the shape of a ring surrounded by a wire, and the inner diameter of the ring is slightly larger than the outer diameter of the positioning guide wire, so as to facilitate the sliding fit between the positioning guide wire and the positioning member.

[0010] In one embodiment, both ends of the wire are embedded in the wall of the guide catheter, and the middle portion of the wire and the outer wall of the guide catheter form a closed annular structure.

[0011] In one embodiment, a portion of the wire is embedded in the wall of the guide catheter, and another portion of the wire is wound around the guide catheter into a closed annular structure.

[0012] In one embodiment, the positioning member is tubular, and the inner diameter of the tube is slightly larger than the outer diameter of the positioning guide wire.

[0013] In one embodiment, the positioning member is a slot with an opening, the opening size of the slot is smaller than the outer diameter of the positioning guidewire, and the inner diameter of the slot is slightly larger than the outer diameter of the positioning guidewire to facilitate accommodating the positioning guidewire.

[0014] Compared with the prior art, the guide catheter for bifurcated blood vessels of the present invention cooperates with the positioning guide wire through the positioning piece arranged at the distal end of the tube body, so that the distal end of the tube body and the positioning guide wire form an angle at the bifurcation of the bifurcated blood vessel, thereby anchoring the guide catheter and forming support at the bifurcation of the blood vessel. When a pushing force is applied to the proximal end of the tube body, the positioning guide wire can abut against the non-diseased blood vessel, providing strong support for the guide catheter abutting against the blood vessel bifurcation, and transferring the force support point of the guide catheter from the proximal end of the tube body to the blood vessel bifurcation. The support point is closer to the distal end of the guide catheter, which can provide greater support force for the distal part of the guide catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic diagram of a guide catheter for bifurcated blood vessels when used for treating cerebrovascular diseases.

[0016] Figure 2 The present invention is a schematic diagram of the distal portion structure of a guide catheter for bifurcated blood vessels when used for treating cerebrovascular diseases.

[0017] Figure 3 The present invention is a schematic diagram of a guide catheter for bifurcated blood vessels when used for iliac artery treatment.

[0018] Figure 4 The present invention is a schematic diagram of the distal portion of a guide catheter for bifurcated blood vessels when used for iliac artery treatment.

[0019] Figure 5 The present invention is a schematic diagram of a tubular structure of a positioning member of a guide catheter for a bifurcated blood vessel.

[0020] Figure 6 The present invention is a cross-sectional schematic diagram of one embodiment of a guide catheter for a bifurcated blood vessel when the positioning piece of the guide catheter is annular.

[0021] Figure 7 The present invention is a cross-sectional schematic diagram of a guide catheter used for a bifurcated blood vessel when the positioning piece of the guide catheter is a clamping groove with an opening. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1 and Figure 2 As shown, the bifurcated blood vessels include mutually connected diseased blood vessels 4 and non-diseased blood vessels 5 connected to the diseased blood vessels 4, and the guide catheter includes a tube body 1, a positioning member 2 and a positioning guide wire 3 arranged at the distal end of the tube body. When used clinically, the guide catheter can find a bifurcated blood vessel for anchoring on the proximal side of the diseased area to facilitate positioning. Therefore, the positioning guide wire 3 can slide through the positioning member 2 to enter the non-diseased blood vessel 5, and the distal end of the tube body 1 enters the diseased blood vessel 4. The positioning guide wire 3 and the distal end of the tube body 1 form an angle at the bifurcation of the bifurcated blood vessel, thereby getting stuck at the bifurcation of the blood vessel.

[0024] In the prior art, when the device is pushed in the guide catheter for use or when injecting drugs, the reaction force generated on the guide catheter drives the guide catheter to retreat toward the proximal end. At this time, the friction between the catheter and the blood vessel and the rigidity of the catheter body itself can only be relied on to offset the retreat force. The present invention forms support at the bifurcation of the blood vessel by cooperating with the positioning member 2 and the positioning guide wire 3 provided at the distal end of the tube body 1. When a pushing force is applied to the proximal end of the tube body 1, the positioning guide wire 3 abuts against the non-diseased blood vessel 5, providing strong support for the guide catheter abutting against the bifurcation of the blood vessel, and transferring the force support point of the guide catheter from the proximal end of the tube body to the bifurcation of the blood vessel. The support point is closer to the distal end of the guide catheter, and can provide greater support force for the distal part of the guide catheter.

[0025] The positioning member 2 is fixedly connected to the tube body 1, and the distance between the distal end of the positioning member 2 and the distal end of the tube body 1 is 0-30 cm. Preferably, the distance between the distal end of the positioning member 2 and the distal end of the tube body 1 is 10-30 cm, or the distance between the distal end of the positioning member 2 and the distal end of the tube body 1 is 0-15 cm.

[0026] The positioning member 2 can be designed in various forms according to requirements, and can form a sliding fit with the positioning guide wire 3. In one embodiment, Figure 4 As shown, the positioning member 2 is in the shape of a ring surrounded by a wire, the two ends of the wire are buried in the wall of the guide catheter, the middle part of the wire and the outer wall of the guide catheter form a closed ring structure, or a part of the wire is buried in the wall of the guide wire, and the other part of the wire is wound around the guide catheter to form a closed ring structure, and the inner diameter of the ring structure is slightly larger than the outer diameter of the positioning guide wire, so as to facilitate the sliding cooperation between the positioning guide wire and the positioning member; in another embodiment, as Figure 5 and Figure 6 As shown, the positioning member 2 is tubular, and the inner diameter of the tube is slightly larger than the outer diameter of the positioning guide wire; in another embodiment, as shown Figure 7 As shown, the positioning member 2 is a slot with an opening, the opening size of the slot is smaller than the outer diameter of the positioning guide wire, and the inner diameter of the slot is slightly larger than the outer diameter of the positioning guide wire to facilitate accommodating the positioning guide wire.

[0027] When the guide catheter of the present invention is used for the treatment of cerebral arterial vascular diseases, such as Figure 1 and Figure 2As shown, the distance between the distal end of the positioning member 2 and the distal end of the tube body 1 is 0-15cm. During clinical use, the positioning guide wire 3 is passed through the positioning member 2 and then sent into the patient's blood vessel together with the guide catheter. The guide catheter is operated according to conventional surgery, enters through the femoral artery, and then passes through the aorta and the brachiocephalic trunk to enter the common carotid artery, and finally the distal end is delivered to the C1 segment of the internal carotid artery; the better anchor point of this path is the bifurcation where the brachiocephalic trunk enters the common carotid artery, so the positioning guide wire 3 enters the non-diseased blood vessel at the bifurcation, that is, the subclavian artery branch. The angle formed by the positioning guide wire 3 and the distal part of the tube body 1 is stuck at the bifurcation. At this time, a pushing force is applied to the proximal end of the tube body 1, so that the positioning guide wire 3 is against the subclavian artery branch and the blood vessel bifurcation, thereby anchoring the guide catheter and providing strong support for the distal end of the guide catheter.

[0028] When the guide catheter of the present invention is used for the treatment of the iliac artery, Figure 3 and Figure 4 As shown, the distance between the distal end of the positioning member 2 and the distal end of the tube body 1 is 10-30cm. During clinical use, the positioning guide wire 3 is passed through the positioning member 2 and then sent into the patient's blood vessel together with the guide catheter. The guide catheter is operated according to conventional surgery, through the brachial artery approach, and then through the subclavian artery, brachiocephalic trunk and aorta, and finally the distal end is delivered to the iliac artery segment; the better anchor point of this path is the bifurcation where the abdominal aorta enters the iliac artery, so the positioning guide wire 3 enters the iliac artery of the non-diseased blood vessel. The angle formed by the positioning guide wire 3 and the distal part of the tube body 1 is stuck at the bifurcation. At this time, a pushing force is applied to the proximal end of the tube body 1, so that the positioning guide wire 3 is pushed against the bifurcation of the blood vessel, thereby anchoring the guide catheter and providing strong support for the distal end of the guide catheter.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A guide catheter for a bifurcated blood vessel, wherein the bifurcated blood vessel comprises a diseased blood vessel connected to each other and a non-diseased blood vessel connected to the diseased blood vessel, characterized in that: The guide catheter includes a tube body, a positioning piece arranged at the distal end of the tube body, and a positioning guide wire. The positioning guide wire can slidably pass through the positioning piece to enter the non-diseased blood vessel, and the distal end of the tube body enters the diseased blood vessel. The positioning guide wire and the distal end of the tube body form an angle at the bifurcation of the bifurcated blood vessel.

2. The guide catheter for bifurcated blood vessels according to claim 1, characterized in that: The positioning member is fixedly connected to the tube body, and the distance between the distal end of the positioning member and the distal end of the tube body is 0-30 cm.

3. The guide catheter for bifurcated blood vessels according to claim 2, characterized in that: The distance between the distal end of the positioning member and the distal end of the tube body is 0-15 cm.

4. The guide catheter for bifurcated blood vessels according to claim 2, characterized in that: The distance between the distal end of the positioning member and the distal end of the tube body is 10-30 cm.

5. The guide catheter for bifurcated blood vessels according to claim 2, characterized in that: The positioning piece is in a ring shape surrounded by wire.

6. The guide catheter for bifurcated blood vessels according to claim 5, characterized in that: Both ends of the wire are buried in the wall of the guide catheter, and the middle part of the wire and the outer wall of the guide catheter form a closed ring structure.

7. The guide catheter for bifurcated blood vessels according to claim 5, characterized in that: One portion of the wire is embedded in the wall of the guide wire, and another portion of the wire is wound around the guide wire to form a closed annular structure.

8. The guide catheter for bifurcated blood vessels according to claim 2, characterized in that: The positioning piece is tubular.

9. The guide catheter for bifurcated blood vessels according to claim 2, characterized in that: The positioning member is a slot with an opening, and the opening size of the slot is smaller than the outer diameter of the positioning guide wire.

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