US 12,349,915 B1
Elastic band ligation device with anti-pinch feature and method for treatment of hemorrhoids
David Chotenovsky, Barrie (CA); and Mitchel Guttenplan, Roswell, GA (US)
Assigned to CRH Medical Corporation, Vancouver (CA)
Filed by CRH Medical Corporation, Atlanta, GA (US)
Filed on Dec. 10, 2024, as Appl. No. 18/975,399.
Application 18/975,399 is a continuation of application No. 16/746,467, filed on Jan. 17, 2020, granted, now 12,201,302.
Application 16/746,467 is a continuation of application No. 13/972,202, filed on Aug. 21, 2013, abandoned.
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 17/12 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/12009 (2013.01) [A61B 2017/00818 (2013.01); A61B 2017/12018 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A ligation apparatus, comprising:
(A) an inner elongate member, comprising:
(i) an interior surface, an exterior surface, a first inner opening, and a second inner opening;
(ii) an inner tapering portion terminating at the first inner opening;
(iii) an inner cylindrical portion terminating at the second inner opening and a raised ring positioned on the exterior surface;
(iv) at least one protrusion extending from the exterior surface and adjacent to the second inner opening;
(B) an outer elongate member configured to slidably sheath the inner elongate member, comprising:
(i) an outer tapering portion configured to fit over the inner tapering portion; and
(ii) an outer cylindrical portion, comprising:
(a) a raised ridge positioned on an interior surface of the outer cylindrical portion and configured to, when engaged with the raised ring of the inner cylindrical portion, impede longitudinal movement of the outer elongate member relative to the inner elongate member; and
(b) at least one protrusion extending from an exterior surface of the outer cylindrical portion and configured to disengage the raised ridge from the raised ring; and
(C) a single piece obturator plunger disposed within the inner elongate member, comprising:
(i) a rounded tip configured to extend through the first inner opening of the inner elongate member;
(ii) an elongate stem, comprising:
(a) an elongate first stem portion adjacent to the rounded tip and extending to a seal, wherein the seal is configured to provide sealing on the interior surface of the inner elongate member; and
(b) an elongate second stem portion configured to extend through the second inner opening; and
(iii) a handle adjacent to the elongate second stem portion; and
(iv) wherein the single piece obturator plunger is configured to create suction force at the first inner opening of the inner elongate member.