Method and apparatus for insertion of a cannula and trocar
OwnerAlbert E. Stouder, Jr.inventor
Life of this patent
Estimating the term…
Abstract
An adjustable length cannula which may be longitudinally extended or retracted in order to accommodate a range of body cavity wall thicknesses. A method for inserting the cannula is disclosed, in which a guiding cannula is placed into the peritoneal cavity using the insufflation needle as a guidewire, and a screw dilator and cannula are then placed into the peritoneal cavity using the guiding cannula as a guidewire. The guiding cannula also allows visual inspection of the peritoneal cavity with an endoscope prior to insertion of the dilator/cannula in order to verify proper clearance.
Claims23
A method for inserting a cannula through a body cavity wall and into a body cavity, comprising the steps of:
- (a) providing an insufflation needle:
- (b) providing a guiding cannula;
- (c) providing a hollow dilator;
- (d providing a second cannula;
- (e) inserting the insufflation needle through the body cavity wall such that a distal end of the insufflation needle extends into the body cavity;
- flowing gas through the insufflation needle and into the body cavity in order to insufflate the body cavity;
- (g) inserting the guiding cannula over the insufflation needle and through the body cavity wall such that a distal end of the guiding cannula extends into the body cavity wherein inserting the guiding cannula causes the guiding cannula to block the flow of gas through the insufflation needle;
- and
- (h) inserting the hollow dilator sleeved within the second cannula through the body cavity wall over the guiding cannula, such that a distal end of the dilator and a distal end of the second cannula extend into the body cavity.
A method for inserting a cannula through a body cavity wall and into a body cavity, comprising the steps of:
- (a) providing an insufflation needle;
- (b) providing a guiding cannula;
- (c) providing a hollow dilator;
- (d) providing a second cannula;
- (e) inserting the insufflation needle through the body cavity wall such that an opening near a distal end of the insufflation needle is within the body cavity;
- (f) flowing gas through the opening and into the body cavity in order to insufflate the body cavity;
- (g) inserting the guiding cannula over the insufflation needle and through the body cavity wall such that a distal end of the guiding cannula is within the body cavity wherein inserting the guiding cannula substantially blocks further flow of gas through the insufflation needle;
- (h) withdrawing the insufflation needle from the body cavity;
- (i) inserting the dilator sleeved within the second cannula through the body cavity wall over the guiding cannula, such that a distal end of the dilator and a distal end of the second cannula extend into the body cavity;
- (j) withdrawing the guiding cannula from the body cavity;
- and
- (k) withdrawing the dilator from the body cavity.
A method for inserting a cannula through a body cavity wall and into a body cavity, comprising the step of:
- (a) sleeving a guiding cannula over an insufflation needle;
- (b) sleeving a dilator over the guiding cannula;
- (c) sleeving a second cannula over the dilator;
- (d) inserting the insufflation needle through the body cavity wall such that an opening near a distal end of the insufflation needle is within the body cavity;
- (e) flowing gas through the opening and into the body cavity in order to insufflate the body cavity;
- (f) advancing the guiding cannula over the insufflation needle and through the body cavity wall, wherein advancing the guiding cannula substantially blocks further flow of gas through the insufflation needle;
- (g) withdrawing the insufflation needle from the body cavity;
- and
- (h) advancing the dilator and the second cannula over the guiding cannula and through the body cavity wall.
A method for inserting a cannula through a body cavity wall and into a body cavity, comprising the steps of:
- (a) providing an insufflation needle;
- (b) providing a guiding cannula;
- (c) inserting the insufflation needle through the body cavity wall such that a distal end of the insufflation needle extends into the body cavity;
- (d) flowing gas through the insufflation needle and into the body cavity in order to insufflate the body cavity;
- and
- (e) inserting the guiding cannula over the insufflation needle and through the body cavity wall such that a distal end of the guiding cannula extends into the body cavity, wherein inserting the guiding cannula causes the guiding cannula to block the flow of gas through the insufflation needle.
Dependencies are inferred from the claim text.