1. A surgical access apparatus for positioning within an incision in tissue to facilitate access to an underlying surgical site, the surgical access apparatus comprising:
a housing configured to removably receive at least one surgical object;
an elongated member extending distally from the housing defining an axial lumen configured to allow the at least one surgical object to pass therethrough, the elongated member being adapted to transition from a first extended condition, in which the elongated member is configured for at least partial insertion within the incision, and a second compressed condition, in which the elongated member defines a tissue engaging portion configured to facilitate anchoring of the elongated member within the incision; and
at least one filament secured to the elongated member and extending proximally relative thereto, the at least one filament being dimensioned for grasping by a user such that drawing the at least one filament proximally transitions the elongated member from the first condition to the second condition.
2. The surgical access apparatus of claim 1, wherein the at least one filament is disposed within the lumen of the elongated member.
3. The surgical access apparatus of claim 1, wherein the at least one filament is secured to an external surface of the elongated member.
4. The surgical access apparatus of claim 1, further including a membrane disposed about at least a proximal portion of the elongated member to facilitate anchoring of the elongated member within the tissue.
5. The surgical access apparatus of claim 1, wherein the housing includes locking structure configured to engage the at least one filament and thereby maintain the second condition of the elongated member.
6. The surgical access apparatus of claim 5, wherein the locking structure includes at least one channel formed in the housing, the at least one channel being configured to at least partially receive the at least one filament.
7. The surgical access apparatus of claim 6, wherein the locking structure includes a locking member repositionable between unlocked and locked positions, the locking member defining a channel therethrough configured to at least partially receive the at least one filament, the channel of the locking member and the channel formed in the housing being substantially aligned when the locking member is in the unlocked position.
8. The surgical access apparatus of claim 7, wherein the channel of the locking member and the channel formed in the housing are substantially misaligned when the locking member is in the locked position.
9. The surgical access apparatus of claim 8, wherein the locking member is biased towards the locked position by a biasing member.
10. The surgical access apparatus of claim 1, wherein the elongated member includes a tubular braid formed of a mesh of fibers.
11. The surgical portion assembly of claim 10, wherein the fibers are substantially elastic.
12. A surgical access apparatus, which comprises:
a housing;
an elongated member extending from the housing and having proximal and distal ends, the elongated member defining a longitudinal axis and an axial lumen for passage of a surgical object, the elongated member having a tissue engaging segment dimensioned and adapted to transition between a first condition where the tissue engaging segment defines a first transverse dimension to permit insertion through tissue, and a second transverse dimension greater than the first transverse dimension to facilitate anchoring of the elongated member within the tissue; and
a filament secured to the elongated member, the filament being dimensioned for manual manipulation such that movement of the filament along the longitudinal axis causes the tissue engaging segment to transition between the first condition and the second condition.
13. The surgical access apparatus of claim 12 wherein the tissue engaging segment of the elongated member is dimensioned to transition from the first condition to the second condition upon proximal longitudinal movement of the filament.
14. The surgical access apparatus according to claim 13 wherein the housing includes a lock, the lock dimensioned to selectively engage the filament to maintain the tissue engaging segment in the second condition.
15. The surgical access apparatus according to claim 14 wherein the lock is movable between a locked condition securing the filament and a release condition releasing the filament.
16. The surgical access apparatus according to claim 15 wherein the lock is normally biased toward the locked condition.
17. The surgical access apparatus according to claim 12 wherein at least the tissue engaging segment of the elongated member includes a braid.
18. The surgical access apparatus according to claim 17 including a resilient membrane mounted about the elongated member.
19. The surgical access apparatus according to claim 18 wherein the resilient membrane is mounted about the tissue engaging segment.
20. The surgical access apparatus according to claim 17 wherein the filament is secured to the tissue engaging segment.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A varnish composition comprising:
composition (A): an epoxy resin including:
composition (A-1): a phosphorus containing epoxy resin, a phosphorus and silicon containing epoxy resin, or a mixture thereof;
composition (A-2): dicyclopentadiene epoxy resin; and
composition (A-3): oxazolidone epoxy resin;
composition (B): a hardener, wherein the hardener of composition (B) is a polymer of styrene and maleic acid anhydride, a benzoxazine resin, or a mixture thereof;
composition (C): an accelerant;
composition (D): phosphorus-containing flame retardant; and
composition (E): fillers,
wherein the dicyclopentadiene epoxy resin of composition (A-2) is shown as formula 4:
wherein \u201ci\u201d represents a number of repeat units.
2. A prepreg prepared by applying the varnish composition of claim 1 to a composite fabric.
3. A substrate of printed circuit board prepared by laminating the prepreg of claim 2.
4. The varnish composition according to claim 1, wherein the phosphorus-containing epoxy resin of composition (A-1) is an epoxy resin formed with a phosphorus-containing reactant selected from the group consisting of formula 1, formula 2, and formula 3 as listed below:
5. The varnish composition according to claim 1, wherein the phosphorus and silicon containing epoxy resin of composition (A-1) is an epoxy resin formed with a silicon-containing reactant and a phosphorus-containing reactant selected from the group consisting of formula 1, formula 2, and formula 3 as listed below:
6. The varnish composition according to claim 1, wherein the oxazolidone epoxy resin of composition (A-3) is shown as formula 5:
7. The varnish composition according to claim 1, wherein the composition (A) further includes composition (A-4): naphthalene epoxy resin.
8. The varnish composition according to claim 7, wherein the naphthalene epoxy resin of composition (A-4) is shown as formula 6:
wherein \u201cn\u201d represents a number of repeat units.
9. The varnish composition according to claim 1, wherein the benzoxazine resin of composition (B) is shown as formula 7:
wherein \u201cR\u201d is a composition selected from the group consisting of S, CH2,