Trocar with profile to reduce insertion force

Details Trocar with profile to reduce insertion force Trocar with profile to reduce insertion force

1993-02-11

1993-11-23

Pellegrino, Stephen C.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604264, 604272, 606167, A61M 5178

Patent

active

052639371

ABSTRACT:
This invention relates to a safety trocar which requires less insertion force to penetrate the abdominal wall than the prior art devices. The trocar has a blade with a shaft and body. The body includes a pointed tip which makes the initial incision in the abdominal wall of the patient. The body of the blade has a shoulder which is of a reduced size as compared to the body thereby creating a stepped relationship between the body and the shoulder of the blade. The thickness of the step formed by the relationship of the diameter of the body and shoulder is substantially the same thickness as the wall thickness of the cylindrical cannula that fits over the blade. The inside diameter of substantially the entire length of the cannula is substantially the same as the outside diameter of the body of the blade. The proximal end of the cannula has a number of slits cut in an axial direction along the cannula, thereby creating finger-like segments at the distal end of the cannula that are formed of a material that is biased radially inwardly. The slits allow the fingers, which are biased radially inwardly, to collapse around the shoulder of the blade and the ends of the fingers have a shape substantially designed to conform to the outer shape of the body of the blade so that the biasing forces of the fingers causes the fingers to grip the shoulder of the blade. The structure creates a smooth transition between the blade through the body region and on to the outer surface of the cannula so that the forces necessary to cause the trocar to penetrate the abdominal wall are substantially reduced.

REFERENCES:
patent: 1045906 (1912-12-01), Sweet
patent: 3039468 (1962-06-01), Price
patent: 3789852 (1974-02-01), Kim et al.
patent: 4464169 (1984-08-01), Semm
patent: 4490136 (1984-12-01), Ekbladh et al.
patent: 4535773 (1985-08-01), Voon
patent: 4576589 (1986-03-01), Kraus et al.
patent: 4588398 (1986-05-01), Daugherty et al.
patent: 4601710 (1986-07-01), Moll
patent: 4654030 (1987-03-01), Moll et al.
patent: 4676774 (1987-06-01), Semm et al.
patent: 4874362 (1989-10-01), Wiest et al.
patent: 4902280 (1990-02-01), Lander
patent: 4931042 (1990-06-01), Holmes et al.
patent: 4943280 (1990-07-01), Lander
patent: 4966578 (1990-10-01), Baier et al.
patent: 5009643 (1991-04-01), Reich
patent: 5030206 (1991-07-01), Lander
patent: 5053016 (1991-10-01), Lander
patent: 5057082 (1991-10-01), Burchette, Jr.
patent: 5066288 (1991-11-01), Deniega et al.
patent: 5073169 (1991-12-01), Raiken
patent: 5104382 (1992-04-01), Prinkerhoff et al.
patent: 5104383 (1992-04-01), Shichman
patent: 5112321 (1992-05-01), Hiltebrandt
patent: 5114407 (1992-05-01), Burbank
patent: 5122122 (1992-06-01), Allgood
patent: 5129885 (1992-07-01), Green et al.
patent: 5137509 (1992-08-01), Freitas
patent: 5147316 (1992-09-01), Castillenti
patent: 5152754 (1992-10-01), Plyley et al.
patent: 5158552 (1992-10-01), Borgia et al.

Affiliated with

Also associated with

Rating

Trocar with profile to reduce insertion force does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Trocar with profile to reduce insertion force, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trocar with profile to reduce insertion force will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1844693