Patent ID: 6086542
Filing Date: 2000-07-11
Classification: A61B

Abstract:
A pressure sensing input/output surgical cannula for receiving an elongated instrument and for providing a fluid inflow channel, a fluid outflow channel and a pressure sensing channel comprising:an elongated inner tubular member having a first lumen, a distal end, a proximal end and a fluid port at said proximal end in communication with said first lumen, said first lumen being open at said distal and proximal ends and sized to receive said elongated instrument therein and provide an annular fluid outflow channel between said instrument and the wall of said first lumen;an elongated intermediate tubular member having a second lumen, an open annular distal end, a proximal end and a fluid port at said proximal end in communication with said second lumen, said intermediate tubular member coaxially situated about said inner tubular member and defining an annular pressure sensing channel between said inner tubular member and said intermediate tubular member; andan elongated outer tubular member having a third lumen, a distal end, a proximal end and a fluid port in communication with said third lumen, said outer tubular member coaxially situated about said intermediate tubular member and defining an annular fluid inflow channel between said outer tubular member and said intermediate tubular member, said outer tubular member having a conical surface tapered at said distal end toward said inner tubular member, said conical surface provided with a plurality of circumferentially spaced, axially elongated fenestrations.