Instrument seal with inverting shroud
View Patent ↗A surgical access device comprising an instrument access channel extending through an instrument seal and a shroud comprising an inverting region disposed distally of the instrument seal exhibits improved tear-resistance of the instrument seal from instrument manipulation, for example, instrument withdrawals. Some embodiments of the inverting region invert through the instrument seal on instrument withdrawal. Some embodiments of the inverting region induce at least a portion of the instrument seal itself to invert on instrument withdrawal.
1. A surgical access device comprising a proximal end; a distal end; an instrument access channel extending through the access device from the proximal end to the distal end; a seal housing having a cap providing entry to the access channel at the proximal end; an instrument seal comprising an opening substantially aligned with the instrument access channel and a sealing portion configured to seal against an instrument inserted into the opening; and a shroud substantially aligned with the instrument access channel, an inverting portion thereof disposed distally of the opening in the instrument seal, the shroud comprising an aperture through the inverting portion; the instrument seal being located between the seal housing cap and the shroud, wherein
the access device is convertible between a first state and a second state;
in the first state, the inverting portion of the shroud is not inverted;
in the second state, the inverting portion of the shroud is inverted and contacts the instrument seal, thereby protecting the instrument seal from damage by an instrument; and
moving an instrument proximally in the access channel converts the access device from the first state to the second state.
2. The surgical access device of claim 1 , wherein the surgical access device is a trocar comprising a seal assembly and a cannula, and the instrument seal and the inverting shroud are disposed in the seal assembly.
3. The surgical access device of claim 1 , wherein the instrument seal comprises a gel seal.
4. The surgical access device of claim 1 , wherein the instrument seal comprises a septum seal.
5. The surgical access device of claim 4 , further comprising a seal shield proximal of the septum seal.
6. The surgical access device of claim 4 , wherein the shroud is disposed on and moves with the septum seal.
7. The surgical access device of claim 1 , wherein the shroud floats relative to the instrument seal.
8. The surgical access device of claim 1 , further comprising a zero seal substantially aligned with the instrument channel.
9. The surgical access device of claim 8 , wherein the zero seal comprises at least one of a duckbill valve and a double-duckbill valve.
10. The surgical access device of claim 1 , wherein the shroud comprises at least one of a polyolefin, polyethylene, polypropylene, polyvinyl chloride (PVC), polyvinylidene chloride, polytetrafluoroethylene (PTFE), polyester, polyamide, aramid (Kevlar®), polyimide, polyether block amide, fluorinated polymers, polyurethane, polyether, rubber, synthetic rubber, silicone, ethylene propylene diene monomer (EPDM), ethylene-propylene copolymer (EP rubber), polyisoprene, polybutadiene, polyurethane, styrene-butadiene, ethylene vinyl acetate (EVA), polychloroprene, perfluoroelastomer, and thermoplastic elastomer.
11. The surgical access device of claim 1 , wherein the shroud comprises at least one of a slit, a slot, a hole, and a vent.
12. The surgical access device of claim 1 , wherein the inverting portion of the shroud converges frustoconically to the aperture.
13. The surgical access device of claim 1 , wherein the inverting portion of the shroud is substantially cylindrical.
14. The surgical access device of claim 1 , wherein the aperture of the shroud seals against the instrument extending therethrough.
15. The surgical access device of claim 1 , wherein in the second state, at least a portion of the inverting element of the shroud extends through the instrument seal.
16. The surgical access device of claim 1 , wherein in the second state, the inverting element of the shroud inverts at least a portion of the instrument seal.
17. A surgical access device comprising a proximal end; a distal end; an instrument access channel extending through the access device from the proximal end to the distal end; a seal housing having a cap providing entry to the access channel at the proximal end; an instrument seal substantially aligned with the instrument access channel and having a sealing portion configured to seal against an instrument inserted into the opening; and a means for protecting the instrument seal from damage on withdrawing an instrument from the instrument access channel by contact with the instrument seal the instrument seal being located between the seal housing cap and said means for protecting the instrument seal.