Patent ID: 11925332
Assignee: AURIS HEALTH, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 13:
14. A sheath comprising:
an outer tube configured to be percutaneously inserted into anatomy of a patient, the outer tube including a first distal axial opening;
a first hub coupled to a proximal end of the outer tube, the first hub comprising:
an irrigant fluid port; and
a pressure relief valve associated with the irrigant fluid port;

an inner tube configured to be disposed within the outer tube, an inner wall of the inner tube defining an inner channel, the inner tube including a proximal opening and a second distal axial opening that is concentric with the first distal axial opening; and
a second hub coupled to a proximal end of the inner tube and configured to be coupled to the first hub and provide a fluid seal between the first hub and the second hub, the second hub comprising a plurality of radially-projecting fins;
wherein, when the first hub is coupled to the second hub:
the outer tube extends beyond a distal end of the inner tube;
an outer irrigant fluid channel is defined between an inner wall of the outer tube and an outer wall of the inner tube;
the outer irrigant fluid channel is in fluid communication with the irrigant fluid port; and
fluid outflow is permitted in a space between a working instrument disposed within the inner tube and the inner wall of the inner tube, the working instrument being passed through the first and second distal axial openings;

wherein:
the space between the working instrument and the inner wall of the inner tube extends from the second distal axial opening of the inner tube to the proximal opening of the inner tube, such that the fluid outflow can pass through the inner tube from the second distal axial opening to the proximal opening of the inner tube;
the pressure relief valve is configured to expel irrigant fluid from the outer irrigant fluid channel when fluid pressure within at least one of the outer irrigant fluid channel or the irrigant fluid port exceeds a threshold level.