Catheter apparatus
A suction catheter for fragmenting and removing obstructive material and thrombus from the body or other body cavities that comprises a tube-like body with a proximal and distal end and a pressure lumen and discharge lumen formed in the catheter body. At the distal end of the catheter is a suction opening adjacent to the opening of the nozzle injector formation. At the proximal end of the catheter the lumens are connected to an inlet port and a discharge outlet. A hub structure is coupled to the proximal end of the catheter tubular body and includes a pressure lumen for connecting a fluid source to the pressure inlet. At the proximal end of the tubular catheter a discharge lumen is connected at the proximal hub to a discharge reservoir. The suction port at the distal end of the catheter may be formed into a separate lumen within the catheter body and may include a guidewire lumen.
1. A suction catheter apparatus, comprising:
a tubular body having a proximal end portion and a distal end portion, and a suction opening at the distal end portion for collecting material from a region external to the distal portion, the tubular body defining at least first and second lumens extending from the proximal end portion to the distal end portion, each of the first and second distinct lumens in fluid communication with a chamber defined within the distal end portion of the tubular body, the chamber being in fluid communication with the suction opening, the distal end portion of the tubular body defining a longitudinal axis coincident with or parallel to a central axis circumaxially around which is formed a side wall of the tubular body;
a tube extending from the first lumen of the tubular body into the chamber and defining a tube channel and an emission opening in fluid communication with the tube channel, the tube being substantially U-shaped in the chamber, wherein the emission opening is positioned and oriented in combination with the tube channel to direct fluid flow from the tube channel into an emission jet that is flowable within the chamber and past the suction opening in a flow path that is skewed relative to the longitudinal axis;
a connector secured to the proximal end portion of the tubular body and having an inlet coupling portion and an outlet coupling portion, the inlet coupling portion having an inlet lumen in fluid communication with the first lumen of the tubular body, and the outlet coupling portion having a separate outlet lumen in fluid communication with the second lumen of the tubular body;
a pump for delivering pressurized fluid from a fluid reservoir to the chamber through the inlet lumen, the first lumen, and the tube channel; and
a collection chamber in fluid communication with the outlet lumen for collecting the material through the second lumen.
2. The suction catheter as in claim 1 wherein the tube channel defines a non-planar axis.
3. The suction catheter apparatus as in claim 1 wherein the flow path is skewed by between 5°-45° relative to the longitudinal axis.
4. The suction catheter apparatus as in claim 3 wherein the emission jet emits in a distal to proximal direction.
5. The suction catheter apparatus as in claim 1 , including a valve configured to selectively interrupt fluid flow through the tube channel.
6. The suction catheter apparatus as in claim 5 wherein the valve is operable with an open/close cycle of between 0.5-10 Hz.
7. The suction catheter apparatus as in claim 1 , including an outflow orifice at the distal end portion of the tubular body for permitting fluid flow into the region external to the distal end portion.
8. The suction catheter apparatus as in claim 7 wherein the outflow orifice is in fluid communication with the chamber, and wherein the fluid flow is from the tube channel or from the second lumen.