초록 ▼

A surgical cannula having a first seal member having a substantially conical shape and an opening at the tip thereof, and a second seal member having a substantially conical shape and a slit at the tip thereof, whereby (a) when an instrument is inserted into the cannula, the instrument can pass thro

A surgical cannula having a first seal member having a substantially conical shape and an opening at the tip thereof, and a second seal member having a substantially conical shape and a slit at the tip thereof, whereby (a) when an instrument is inserted into the cannula, the instrument can pass through the first and second seal members into proximity with a surgical site located beneath the cannula, and fluid entering the cannula from the site will force the first seal member to close around the instrument and form a tight seal therewith so as to prohibit fluid from passing out of the cannula and (b) when no instrument is inserted into the cannula, fluid entering the cannula from the site will force the conical second seal member to close tightly on its slit and thereby form a tight seal so as to prohibit fluid from passing out of the cannula.

대표청구항 ▼

A surgical cannula comprising: a hollow housing; a first seal member; and a second seal member; said housing having a top end, a bottom end, and a side wall defining an interior passageway extending from said top end to said bottom end; said first seal member being hollow and conically tapered and h

A surgical cannula comprising: a hollow housing; a first seal member; and a second seal member; said housing having a top end, a bottom end, and a side wall defining an interior passageway extending from said top end to said bottom end; said first seal member being hollow and conically tapered and having a top end with a relatively large top end opening and a bottom end with a relatively small bottom end opening, said first seal member being formed from a soft elastomeric material and being disposed in said interior passageway so that its bottom end is directed towards said bottom end of said housing, with said bottom end of said first seal member being disposed within and spaced from said side wall; said second seal member being cup shaped and having an open top end and a conically tapered bottom end, said second seal member being formed from a soft elastomeric material and being disposed in said interior passageway so that its bottom end is directed towards said bottom end of said housing, with said bottom end of said second seal member being disposed within and spaced from said side wall so as to define a continuous annular gap therebetween, and said second seal member having at least one slit in said bottom end which allows said seal member to expand radially at said bottom end into said annular gap and towards said side walls so as to form a variable size opening at said slit; whereby (a) when an instrument is inserted into said housing via said top end, said instrument can pass through said first and second seal members into proximity with a surgical site beneath said bottom end of said housing, and fluid entering said interior passageway via said bottom end of said housing will force said first seal member to close around said instrument and form a tight seal therewith so that no fluid can flow out said top end of said housing, and (b) when no instrument is inserted into said housing, fluid entering said interior opening via said bottom end of said housing will force the bottom end of said second seal to contract in the region of said at least one slit and thereby form a tight seal so that no fluid can exit said housing via said top end thereof.