Patent ID: 11871977
Assignee: CSA MEDICAL, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A catheter extension control assembly comprising:
a first interior tubular member comprising a proximal portion, a distal portion, a lumen, and a sidewall having an inner surface and an outer surface at least partially surrounding the lumen, wherein the first interior tubular member is a tubular portion of a catheter or is configured to be attached to a catheter that is received in the lumen of the first interior tubular member, the catheter comprising a distal end, and wherein the outer surface of the sidewall of the first interior tubular member comprises at least one circumferential protrusion;
a second exterior tubular member having a length, a proximal portion, a distal portion configured with an endoscope, a lumen extending the length of the second exterior tubular member, and a sidewall having an inner surface and an outer surface at least partially surrounding the lumen, wherein the lumen within the proximal portion of the second exterior tubular member is configured to slidably receive at least the distal portion of the first interior tubular member, and wherein the inner surface of the sidewall of the proximal portion of the second exterior tubular member comprises at least one circumferential recess extending into the sidewall of the second exterior tubular member at a width at least wider than the lumen of the second exterior tubular member, the at least one circumferential recess:
configured to mate with the at least one circumferential protrusion in the outer surface of the sidewall of the first interior tubular member such that the at least one circumferential protrusion extends to the width into the circumferential recess, and
positioned at a location on the second exterior tubular member so that, when the at least one circumferential protrusion in the first interior tubular member mates with the circumferential recess, the distal end of the catheter is positioned a predetermined minimum distance away from the endoscope at the distal portion of the second exterior tubular member; and
a cryogen delivery catheter received in the lumen of the first interior tubular member, wherein the first interior tubular member is attached to the cryogen delivery catheter.