Patent ID: 7780639

Claim:
A trocar assembly comprising: a trocar including an elongated, generally annular cannula for extending through a tissue boundary, said cannula having a distal end for placement on one side of the tissue boundary and a proximal end for placement on another side of the tissue boundary, a trocar base disposed at said proximal end of said cannula, and a trocar lumen extending from a proximal end of said base axially through said cannula to said distal end thereof; and a trocar cap for removable attachment to said proximal end of said trocar base, said cap having a cap lumen, wherein: said trocar includes a magnet comprising an annular disc disposed at said proximal end of said base surrounding said trocar lumen; said trocar cap includes a magnetic member comprising a second magnet or a non-magnetized magnetically permeable member, said magnet on said trocar and said magnetic member on said cap being positioned on said cap and said trocar for magnetically securing said cap to said proximal end of said trocar base with said cap lumen in alignment with said trocar lumen; and said trocar cap and said trocar base include cooperating camming members for generating a force tending to separate said cap and said base upon movement of said cap transversely to said base.