Lumen maintaining catheter for suturing blood vessel

Inventors

Imai, Takanori • Hirota, Hiroshi • Murakami, Tomohiro

Assignees

Medforce Japan Co Ltd

Abstract

There is provided a lumen maintenance catheter used for vascular suture, in which an operator can stably grip the catheter to improve the operability, and the entire catheter is prevented from entering a blood vessel. The lumen maintenance catheter for vascular suture includes a shaft having flexibility and a bulging part bulging in a radial direction at a distal end of the shaft, wherein the shaft includes a small diameter part on a distal end side, and a large diameter part larger in diameter than the small diameter part, on a rear end side, the small diameter part and the large diameter part are connected by an inclined part that is inclined so that a diameter of the shaft increases toward the rear end side, and the rigidity of the shaft increases as the diameter increases.

Core Innovation

The invention relates to a lumen maintenance catheter for vascular suture that includes an integrally formed solid shaft for maintaining a vascular lumen during suturing. A bulging part is disposed at a distal end of the shaft and bulges in a radial direction of the shaft. The shaft is formed by injection-molding the same material and is configured to prevent the lumen from collapsing during vascular suturing.

The shaft includes a small diameter portion on a distal end side and a large diameter portion on a rear end side, and these portions are connected by an inclined portion disposed between them. The inclined portion is continuously inclined so that a diameter of the shaft increases toward the rear end side, and a rigidity of the shaft increases as the diameter increases.

Half or more of a total length of the shaft is occupied by the small diameter portion with a constant diameter, and the large diameter portion has a constant diameter. The large diameter portion has a length longer than a length of the bulging part, enabling the lumen maintenance catheter to be operated by gripping the large diameter portion.

The continuously inclined transition avoids level steps and contributes to stable deformation/operation during insertion, thereby reducing the risk of unintended suturing of an opposite vessel wall. The catheter structure is also described as preventing the catheter from fully entering a blood vessel.

Claims Coverage

The document provides one independent claim covering the overall catheter structure and functional configuration, with additional dependent claims refining the geometry and arrangement of shaft portions.

Across the independent claim, the inventive scope is directed to a lumen maintenance catheter with an injection-molded integrally formed solid shaft and a distal radial bulging part, combined with a continuously inclined transition that increases shaft diameter toward the rear to increase rigidity, where the rear large-diameter portion is long enough for gripping and the small-diameter portion occupies at least half of the shaft length.

Stated Advantages

Documented Applications