초록 ▼

A grooved stylet having a puncture point aligned with the stylet axis is mounted through a catheter to form an assembly. The aligned puncture point enables more accurate piercing of a vein, and reduces the possibility of double piercing the vein. The stylet near its proximal end is provided with a c

A grooved stylet having a puncture point aligned with the stylet axis is mounted through a catheter to form an assembly. The aligned puncture point enables more accurate piercing of a vein, and reduces the possibility of double piercing the vein. The stylet near its proximal end is provided with a circular shoulder which abuts the proximal end of the catheter, and the catheter end is positioned on the stylet so that only the stylet puncture point projects beyond the catheter. The catheter is constructed of a hydrophilic polymer which expands away from the stylet and permits the stylet to be withdrawn from the puncture site, leaving the catheter in place in the vein.

대표청구항 ▼

An assembly for piercing a vein, artery, organ, and the like, comprising: a. a stylet defining an outer surface, distal end, proximal end, and a central longitudinal axis; b. a puncture tip formed at the proximal end of the stylet; c. a circumferential shoulder defined near the proximal end, and adj

An assembly for piercing a vein, artery, organ, and the like, comprising: a. a stylet defining an outer surface, distal end, proximal end, and a central longitudinal axis; b. a puncture tip formed at the proximal end of the stylet; c. a circumferential shoulder defined near the proximal end, and adjacent the puncture tip; and, d. a catheter comprising a hydrophilic polymer disposed over the stylet, the catheter defining an outer surface, a distal end, and a proximal end in contact with the shoulder of the stylet, and forming a continuous interface at the shoulder and outer surface of the stylet, thereby enabling the catheter to enter a puncture site without blockage at the proximal end, and upon contact with liquid in the puncture site, the catheter will expand and thus enable the stylet to be withdrawn, leaving the catheter in place in the puncture site. A method of inserting an assembly of an over-the-stylet catheter into a puncture site in a vein, artery or the like, without coring, comprising: A. inserting the assembly into the puncture site, the assembly comprising: a. a stylet defining an outer surface, distal end, proximal end, and a central longitudinal axis; b. a puncture tip formed at the proximal end of the stylet; c. a circumferential shoulder defined near the proximal end, and adjacent the puncture tip; and, d. a catheter comprising a hydrophilic polymer disposed over the stylet, the catheter defining an outer surface, a distal end, and a proximal end in contact with the shoulder of the stylet, and forming a continuous interface at the shoulder and outer surface of the stylet, thereby enabling the catheter to enter the puncture site without blockage at the proximal end; B. contacting liquid in the puncture site with the assembly, the catheter being adapted to expand away from the stylet upon contact with the liquid; and, C. withdrawing the stylet, leaving the catheter in place in the puncture site.