| 摘要 |
<p>This invention relates to a catheter device having a tubular portion wherein said tubular portion consists essentially of porous PTFE having a density less than about 1.6 grams per cubic centimeter. A catheter device of such porous PTFE tubing is adequately rigid for use as a catheter while having good flexibility to avoid kinking during bending. It is permeable to gases but hydrophobic and resistant to cellular ingrowth. Other embodiments of this invention include a catheter device wherein the tubular portion has a tip part of either greater or lesser density than that of the remainder of the tubular portion, so that the tip part is, respectively, more rigid or more flexible than the remainder of the tubular portion. One embodiment of the present invention may be used as an infusion cannula device. A process for using the catheter device of the present invention is described.</p> |
