Trans-endoscopic hydraulic balloon apparatus

摘要

A trans-endoscopic hydraulic balloon dilation apparatus includes a fluid reservoir containing a hydraulic fluid. A shaft has a lumen in fluid communication with a leading end of the fluid reservoir. A balloon is mounted on the shaft and an opening in the shaft enables hydraulic fluid to flow through the opening into or from the balloon. A piston secured to a leading end of a piston rod is slideably positioned within a lumen of the fluid reservoir. A hub secured to a trailing end of the fluid reservoir is centrally apertured to accommodate the piston rod so that a trailing end of the piston rod is external to the fluid reservoir. Displacement of the piston rod in a trailing-to-leading direction causes expansion of the balloon. Displacement of the piston rod in a leading-to-trailing direction causes deflation of the balloon. The piston can be locked into any position.

主权项

1. A trans-endoscopic hydraulic balloon dilation apparatus, comprising:
a balloon; a hydraulic fluid reservoir having a leading end and a trailing end; an elongate hollow shaft having a lumen in open fluid communication with the balloon at a first end and the hydraulic fluid reservoir at a second end, whereby fluid in the fluid reservoir may flow through the lumen of the shaft into the balloon to cause expansion of the balloon; a centrally apertured hub secured to a trailing end of the fluid reservoir; a piston, secured to the leading end of an elongate piston rod, slideably positioned within a lumen of the fluid reservoir, wherein a trailing end of the piston rod extends through the hub and is external to the fluid reservoir; whereby displacement of the piston rod in a trailing-to-leading direction causes expansion of the balloon; and a retention mechanism positioned on the piston rod wherein the retention mechanism comprises
a plurality of ratchet members having a flexible and resilient construction wherein the plurality of ratchet members are positioned longitudinally on the piston rod and wherein each ratchet member is narrow at its leading end and wide at its trailing end;a disc-shaped ratchet plate disposed at a trailing end of the fluid reservoir;an elongate opening formed in center of the disc-shaped ratchet plate wherein the elongate opening is in registration with a diameter of the ratchet plate;the elongate opening having an enlarged central portion that accommodates the piston rod;the elongate opening central portion having a width less than a breadth of the ratchet members;the elongate opening having a length greater than the breadth of the ratchet members;wherein the ratchet members are freely moveable through the elongate opening when the elongate opening is aligned with the ratchet members and moveable in only one direction when the elongate opening is not in alignment with the ratchet members;wherein when the elongate opening is not in alignment with the ratchet members, the ratchet members may be momentarily compressed when pushed through the elongate opening central portion for movement in only one direction; whereby the retention mechanism locks the piston in a preselected position within the lumen of the fluid reservoir when the elongate opening is not aligned with the plurality of ratchet members.