Importance

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Abstract

A syringe instrument for particular use in medical balloon inflation procedures comprises a fluid chamber and a plunger arranged to displace fluid from the chamber for delivery to inflate the balloon, and incorporates control structure arranged to provide a series of releasible space limits for respective displacements of the plunger within the chamber. The control structure allows the fluid in the chamber to be pressurized at selective predetermined pressure levels governed by the releasable limits for the plunger displacements. A reverse drive structure is provided for reverse-displacement of the plunger from the fluid chamber to enable self-aspiration of fluid into the chamber from the balloon in order to simplify balloon deflation and removal from the patient. The reverse drive structure is manually activated with the same hand which depresses the plunger, for single handed operation of both the forward and reverse plunger motions. A second fluid displacement structure separate from the plunger, is reversibly displaceable into and from the chamber in order to enable charging aspiration of the pressure fluid into the chamber. A pressure balance mechanism is provided cooperating to allow the plunger to self-adjust in order to maintain the proper predetermined balloon pressure as the dilating duct induces increase in the balloon volume.

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First Claim