Forwardly directed fluid jet crossing catheter

A medical assembly, comprising:

• an elongate tubular member having a high pressure cavity and a low pressure cavity;
• an adhesive plug seal separating the high pressure cavity from the low pressure cavity;
• a high pressure tube extending within the elongate tubular member and between the high pressure cavity and the low pressure cavity, wherein the high pressure tube extends through the plug seal, and wherein the high pressure tube includes a distal portion located in the low pressure cavity;
• a guidewire tube extending within the elongate tubular member and between the high pressure cavity and the low pressure cavity, wherein the guidewire tube extends through the plug seal;
• a guidewire configured to extend within the guidewire tube;
• wherein the guidewire tube includes a fluid entry hole located distal to the plug seal;
• and
• wherein the distal portion of the high pressure tube is located adjacent the fluid entry hole.

A method of using a medical device, the method comprising:

• advancing a guidewire through a body lumen to a target region;
• advancing the medical device over the guidewire, wherein the medical device includes:
• an elongate tubular member having a high pressure cavity and a low pressure cavity;
• an adhesive plug seal separating the high pressure cavity from the low pressure cavity;
• a high pressure tube extending within the elongate tubular member and between the high pressure cavity and the low pressure cavity, wherein the high pressure tube extends through the plug seal, and wherein the high pressure tube includes a distal portion located in the high pressure cavity;
• a guidewire tube extending within the elongate tubular member and between the high pressure cavity and the low pressure cavity, wherein the guidewire tube extends through the plug seal;
• wherein the guidewire tube includes a fluid entry hole located distal to the plug seal;
• and
• wherein the distal portion of the high pressure tube is located adjacent the fluid entry hole.