Interventional catheters incorporating aspiration and/or infusion systems

An interventional catheter assembly comprising:

• an operating head mounted at a distal end of a catheter assembly configured for removing obstructive material from a target site in a body lumen or a cavity;
• an infusion pump operably connected to a fluid infusion system for delivery of an infusate fluid through the catheter assembly to the target site in the body lumen or cavity;
• a detector for detecting a presence of a bubble in the infusate fluid;
• and
• a control module operatively connected to the infusion pump and the operating head;
• wherein upon detection of a bubble in the infusate fluid, the control module inactivates the infusion pump;
• wherein the control module automatically inactivates the fluid infusion system after a selected time period following inactivation of the operating head.

An interventional catheter system, comprising:

• an operating head mounted at a distal end of a catheter assembly configured for removing obstructive material from a target site in a body lumen or a cavity;
• an aspiration system including an aspiration pump for applying vacuum to an aspiration port disposed proximate the operating head;
• an infusion system including an infusion pump for delivery of an infusate fluid through the catheter assembly to a target site in a body lumen or cavity through an infusion port disposed proximal of the aspiration port, wherein the aspiration port is located proximal to the operating head;
• and
• a detector disposed in proximity to an infusate conduit for detecting a presence of a bubble in the infusate fluid;
• wherein upon detection of the presence of the bubble in the infusate fluid, a control module inactivates the aspiration system and the infusion system.