Trocar needle laparoscopy with a threaded truncated cone bit

• US 5,147,376 A
• Filed: 05/02/1991
• Issued: 09/15/1992
• Est. Priority Date: 05/04/1990
• Status: Expired due to Fees

• Current Assignee: Francesco Pianetti
• Original Assignee: Francesco Pianetti
• Inventors: Pianetti, Francesco
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): STRIGHT, RONALD K
• Application Number:
  US07/695,000
• Time in Patent Office: 502 Days
• Field of Search: 128/754, 606/185, 606/180, 606/167, 606/170, 606/73, 604/272, 604/274, 604/51, 604/188, 604/164, 604/170, 604/264, 604/273, 604/239, 411/386-387, 411/394, 411/411
• US Class Current: 606/170
• CPC Class Codes: A61B 17/3417 Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating syringe needles A61M5/32; dilators A61M29/00
• CPC Class Codes: A61B 2017/3454 Details of tips
• CPC Class Codes: A61B 2017/3458 threaded

Abstract

Trocar needle for laparoscopy with a truncated cone bit (1) having at its truncated cone end a cutting blade (2) with a rounded edge arranged obliquely to the axis of the needle and to the plane perpendicular to the axis of the needle which continues with a cutting thread (3) developing in a single turn around the truncated cone tip.

Claims

1. Trocar needle for laparoscopy with a threaded truncated cone bit (1) characterized in that it has at the truncated cone end a flat cutting blade (2) with rounded edge and arranged obliquely to the needle axis and the plane perpendicular to the needle axis and which continues with a cutting thread (3) developing in a single turn around the truncated cone bit and designed to penetrate the abdominal wall by a single rotation without pressure.

2. Trocar needle in accordance with claim 1 characterized in that the blade (2) forms an angle with the needle axis between 40°

and 50°

.

3. Trocar needle in accordance with claim 1 characterized in that the blade (2) forms an angle with the plane perpendicular to the needle axis between 40°

and 50°

.

4. Trocar needle in accordance with claim 1 characterized in that the thread (3) has a triangular cross section.

5. Trocar needle in accordance with claim 1 characterized in that an upper face (4) of the thread (3) forms a 90°

angle with the needle axis.