1993-12-27
1995-01-03
Rimell, Sam
Surgery
Truss
Pad
128760, 604190, A61B 500
Patent
active
053776895
ABSTRACT:
A sampling syringe for collecting a blood sample, in which an elongated tube open at one end communicates with a sampling needle attached at the other end. A plunger rod with a plunger cap slidably inserts into the open end of the tube. The plunger cap comprises a body that encloses an air permeable filter. A front portion of the body slidably contacts the inner wall of the tube for forming a fluid-tight first seal. The plunger cap includes means for forming a fluid-tight second seal spaced from the first seal. The second seal is effected by elastically deforming the body from a first position to a second position. Blood, being communicated through the needle into the tube by moving the plunger rod axially away from the needle, displaces air rearwardly through the filter against the second seal. The air then escapes from the tube upon return of the second seal to its first position. The plunger cap is manufactured by injecting a resilient air impermeable plastic into a void around the filter in a mold, the plastic also communicating through an axial bore in the filter. The pressure of the injection in the bore is then redirected radially outward to flex the filter into the void being filled with the plastic.
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