Method and apparatus for controlled occlusion

摘要

A controlled volume inflation-deflation device to inflate a balloon to occlude a blood vessel by dialing a knob that locks at rotational positions to locate a plunger at equally spaced locations within a syringe of the inflation-deflation device. The inflation-deflation device includes a releasable latch to lock the proximal and distal housings together to hold the plunger forward for occlusion, and to separate and hold the proximal and distal housings to retract the plunger for perfusion. When the inflation-deflation device is returned to the latched position, the balloon is re-inflated to its previous occlusive diameter. Also, an extension tube made of a lower modulus outer material co-extruded over and miscible with a higher modulus inner material may be used to produce a suitably low compliance extension tube for the inflation-deflation device. The balloon may have tapered ends and a cylindrical center portion so that it increases by more equal increments in outer diameter in response to incremental equal increases in inflation volume.

主权项

1. An apparatus comprising:
a cannula having a dimension suitable for percutaneous advancement through a blood vessel, the cannula comprising a proximal and a distal end; and a balloon axially coupled to an exterior surface of the cannula at or adjacent the distal end of the cannula, the balloon comprising a first property such that when inflated the balloon will expand in size to a plurality of predictable and linear relatively equally increasing outer diameters of between 0.12 and 0.25 millimeters (mm), over a range of outer diameters having a maximum designed outer diameter of less than 10 mm, when inflated with a plurality of equally increasing inflation volumes of between 0.005 and 0.05 cubic centimeters (cc), the balloon being a compliant balloon, the compliant balloon comprising a second property such that when deflated the balloon will not return to its original un-inflated outer diameter after inflation to its maximum designed outer diameter, wherein the plurality of relatively equally increasing outer diameters define an approximately cylindrical shape extending along a longitudinal axis of the cannula between two tapered ends of the balloon when inflated with a first inflation volume and define an elliptical or curved shape between the two tapered ends with respect to the axis when inflated with a second inflation volume, wherein the second inflation volume is greater than the first inflation volume.