Abstract: An obturator is disclosed as being of a throwaway, single use, structure, preferably fully formed of thermoplastic, polymeric material and with a piercing and cutting end defined by non-planar faces having depressions formed therein to present cutting edges. The depressions are shaped by compound curves including a partial spherical surface, and angularly related, generally flat surfaces which define the cutting edges. The surfaces are of a shape and orientation as to provide spatial relief to the edges of the walls of a body to which the obturator is applied, thereby preventing stretching and tearing of the wall.

Abstract: Improved methods and apparatus for the collection, purification and reinfusion of blood from a wound site. The present invention provides a source of anticoagulated washing fluid in proportion to the bleeding rate which can be directed to the suction tip in such a way that the wound or surgical site is washed.The present invention minimizes blood damage and maximizes blood recovery by (i) automatically regulating the suction in proportion to the bleeding rate, (ii) minimizing the air suction or blood frothing, (iii) washing the wound site with the anticoagulated washing fluid, and (iv) reducing the number of blood pumps, preferably to one.

Abstract: The subject invention relates to a method and apparatus particularly suitable for use in dilating occluded blood vessels. The apparatus includes a tubular catheter having a balloon member connected to the distal end thereof. The balloon is initially located in an inverted manner with the free end thereof being connected to a reinversion member. A tubular sheath is telescopically mounted within the catheter surrounding said balloon member. In operation, the balloon member is everted by sliding the sheath beyond the distal end of the catheter. Fluid pressure can be utilized to facilitate eversion and to laterally expand the balloon member after it has been extruded through the occlusion. The sheath also aids in reinverting the balloon member.