Surgical trocar
First Claim
Patent Images
1. A trocar comprising:
- a laparoscopic cannula;
an obturator having a sharpened tip for entry into said cannula;
means for moving said sharpened tip between an extended position and a retracted position relative to said cannula;
means for rotating said sharpened tip within said cannula when said tip moves between said extended position and said retracted position;
latch means for releasably maintaining said tip in said extended position; and
spring means for retracting said tip from said extended position to said retracted position responsive to a release of said latch means.
0 Assignments
0 Petitions
Accused Products
Abstract
A safety trocar is provided which includes a spring-loaded shield that shields the cutting tip of the obturator after the obturator penetrates tissue. The distal end of the shield is hemispheric in profile and contains slides within cutting tip. The rounded distal end enables the shield to spring forward to shield the cutting tip as soon as the tip perforates the tissue. In other embodiments, positive mechanical means effect shielding. Alternately, the obturator tip is retractable into the cannula or shield, by use of mechanical means such as a spring mechanism.
-
Citations
10 Claims
-
1. A trocar comprising:
-
a laparoscopic cannula; an obturator having a sharpened tip for entry into said cannula; means for moving said sharpened tip between an extended position and a retracted position relative to said cannula; means for rotating said sharpened tip within said cannula when said tip moves between said extended position and said retracted position; latch means for releasably maintaining said tip in said extended position; and spring means for retracting said tip from said extended position to said retracted position responsive to a release of said latch means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A trocar comprising:
-
a laparoscopic cannula having a plurality of pins respectively projecting radially inwardly from an inner surface of said cannula; an obturator having a sharpened tip for entry into said cannula; means for moving said sharpened tip between an extended position and a retracted position axially relative to said cannula, and wherein said tip is fluted to form spiral grooves for receiving respective ones of said pins to that said fluted tip rotates within said cannula when said tip moves axially relative to said cannula; latch means for releasably maintaining said tip in said extended position; and spring means for retracting said tip from said extended position to said retracted position responsive to release of said latch means. - View Dependent Claims (10)
-
Specification