Locking trocar sleeve

• US 5,122,122 A
• Filed: 11/22/1989
• Issued: 06/16/1992
• Est. Priority Date: 11/22/1989
• Status: Expired due to Term

• Current Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Original Assignee: Dexide, Inc.
• Inventors: Allgood, Fred A.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US07/440,199
• Time in Patent Office: 937 Days
• Field of Search: 604/164, 604/167, 604/169, 604/107, 604/174, 604/105, 606/198
• US Class Current: 604/174
• CPC Class Codes: A61B 17/34 Trocars; Puncturing needles pointed biopsy instruments A61B10/0233; devices for piercing the ear-lobes A44C7/001; seals or hemostasis valves A61M39/06
• CPC Class Codes: A61B 2017/3492 against the outside of the body

Abstract

An improved trocar sleeve (10) is disclosed for use in laparoscopic surgery. The sleeve (10) is provided with an expanded mushroom hinge (20) at the first end (14) of the sleeve inserted into the abdominal cavity. The mushroom hinge (20) can be expanded within the abdominal cavity to abut against the inner surface of the abdominal wall (18) to hold the sleeve in place. A split seal (52) having a concave shape facing the first end (14) of the trocar sleeve (10) is provided to prevent loss of pressurized gas from within the abdominal cavity through the sleeve (10) as the pressure of the gas itself urges the first and second seal lips (78, 80) on opposite sides of the slit in the seal into sealing engagement.

Claims

1. An improved trocar assembly for use in inserting a laparoscopic into the abdominal cavity, comprising:

a trocar sleeve defining a passageway and having a first and second end, said first end having a first external dimension adapted for passage through an incision in an abdominal wall, and a second end for manipulation of the trocar sleeve;

means for expanding a portion of the first end of said trocar sleeve when placed within the abdominal cavity so that the external dimension of the first end may be expanded to a second external dimension to resist withdrawal of the trocar sleeve from the abdominal cavity;

a stop slidably disposed over the second end of said trocar sleeve which can be adjusted to contact the skin of the patient;

a split seal mounted to said trocar sleeve within the passageway, said split seal being formed of resilient material having a concave curvature facing the first end of the trocar sleeve, a slit being formed in the split seal to define first and second seal lips facing each other such that gas pressure in the abdominal cavity urges the first and second seal lips into sealing engagement but which will permit deflection and passage of a laparoscopic instrument through the trocar sleeve

said trocar sleeve including a first sleeve portion and a second sleeve portion, the sleeve portions being concentric relative to each other, said first sleeve portion having a mushroom hinge thereon, said means for expanding a portion of the first end causing the first and second sleeve portions to move relative to each other to expand the mushroom hinge, said means for expanding a portion of the first end including a spring acting between said first and second sleeve portions to expand the mushroom hinge.

2. The improved trocar assembly of claim 1 wherein a handle is mounted on the first sleeve portion and an end member is mounted on said second sleeve portion, the spring acting between said handle and end member, said handle and end member having cooperating latch structure to compress the spring and hold the mushroom hinge in a contracted position for insertion and removal from the incision.