SYRINGE FOR BALLOON CATHETERIZATION

摘要

A unique syringe (10) useful in the inflation and rapid deflation of a balloon used in balloon catheterization (trans-luminal angioplasty) procedures is disclosed. The syringe (10) has an uniquely actuated thread engaging block (20) which is engaged and disengaged by a rotary cam member (22) interacting with the thread engaging block (20). The thread engaging block (20) engages a thread piston rod (17) which is attached to the piston (17a) within the barrel (11) of a balloon catheter syringe. A rotary cam member (22) engages the block so as to exert a positive force on the block, either moving the block into a thread engaging position or moving into a thread disengaging position. The unique syringe may also contain a plunger end face (29) which is structured so that a portion of the piston face is separately actuatable in order to introduce a minor increase or decrease in pressure while the main piston member remains in a stationary position.