Method and apparatus for insertion of a cannula and trocar
First Claim
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1. 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.
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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.
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Citations
23 Claims
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1. A method for inserting a cannula through a body cavity wall and into a body cavity, comprising the steps of:
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(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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for inserting a cannula through a body cavity wall and into a body cavity, comprising the steps of:
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(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. - View Dependent Claims (8, 9, 10)
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11. A method for inserting a cannula through a body cavity wall and into a body cavity, comprising the step of:
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(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. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for inserting a cannula through a body cavity wall and into a body cavity, comprising the steps of:
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(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. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification