Patent ID: 11864999
Assignee: VENUS MEDTECH (HANGZHOU), INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A sheath for delivering an interventional instrument, comprising, from a distal end to a proximal end, a distal end as a loading section for accommodating the interventional instrument, a bendable section, and a first extension section in sequence in an axial direction, the loading section having a larger diameter than the bendable section and the extension section, wherein the sheath has a multi-layer structure and comprises, from inside to outside, an inner layer, a metal tube and an outer wrapping membrane fixedly connected together; the inner layer comprises an inner lining tube distributed in the loading section, and an inner sheath connected to the inner lining tube and distributed in the bendable section and the first extension section, the inner sheath is softer in the bendable section than in the first extending section; the metal tube comprises, from a distal end to a proximal end, a head tube, a main tube and an extension tube connected one another, wherein the head tube and the main tube are mounted around the inner lining tube, and the extension tube is distributed in the bendable section and mounted around the inner sheath, the outer wrapping membrane is wrapped around an outer periphery of the metal tube; and
the head tube comprises a body section, a plurality of elastic expansion pieces arranged circumferentially in intervals on the body section at a distal side thereof.