Trocarless rotational entry cannula
OwnerArtin M. Ternamianinventor
Life of this patent
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Abstract
A cannula for safely and easily gaining access to a body cavity without the use of a trocar, has screw threads on its outer surface and a lumen within the cannula extending throughout the entire length of the cannula. The distal end of the cannula is shaped, along its periphery, to penetrate and/or cut tissue layers of the body wall to gain access to a body cavity. The lumen is sufficiently large throughout its length to allow passage of instruments from the proximal end of the cannula directly into the body cavity, once the cannula has been inserted. A method for gaining access to a body cavity with the cannula is also described.
Claims20
A cannula for accessing a body cavity said cannula having a distal end and a proximal end, a lumen within the cannula extending throughout its entire length, the distal end comprising means for penetrating tissue layers of a body wall to access the body cavity, wherein said lumen is sufficiently large throughout its length to allow passage of instruments directly into the body cavity and wherein said penetrating means is peripherally situated.
A cannula for accessing a body cavity via a small incision through tissue layers of the abdominal wall, the incision at least through the anterior fascial layer being substantially smaller than a transverse dimension of the cannula, the cannula comprising
- a distal end and a proximal end;
- a lumen extending throughout the entire length of the cannula;
- means at the distal end of the cannula to permit the cannula to access the body cavity;
- and
- means on the cannula to facilitate spreading of the tissues around the incision, wherein said lumen is sufficiently large throughout its length to allow passage of instruments directly into the body cavity and wherein the access means at the distal end of the cannula is peripherally situated.
Dependencies are inferred from the claim text.