Method and apparatus for fetal pH scalp studies
First Claim
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1. Apparatus for obtaining blood for fetal pH scalp studies comprisingan elongate, substantially rigid, tubular handle;
- an aspirator needle having its pointed end projecting from one end of the tubular handle and its other end opening into the handle;
a capillary tube having a self-sealing cap on one end thereof through which the pointed end of the needle is inserted to extend into the capillary tube, and heparin on the inner wall thereof, and a metal flea therein;
a yieldable collar surrounding the capillary tube a spaced distance from the self sealing cap and adjacent the one end of the capillary tube; and
a magnet encircling the capillary tube between the self-sealing cap and the yieldable collar, said magnet having a bore dimensioned to slide over the collar upon application of sufficient force to said magnet and deformation of the collar the yieldable collar being spaced from the self-sealing cap a distance just greater than the length of the magnet along the capillary tube.
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Abstract
Apparatus for use in obtaining and processing for analysis blood scalp samples during fetal monitoring. A hollow tube having a blood collection assembly at one end is provided. The blood collection assembly comprises a capillary tube, capped at one end, coated with heparin on the inside, a metal flea inside the tube and held positioned by a magnet outside the tube and means for positioning the magnet until mixing of the blood and heparin is desired.
30 Citations
3 Claims
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1. Apparatus for obtaining blood for fetal pH scalp studies comprising
an elongate, substantially rigid, tubular handle; -
an aspirator needle having its pointed end projecting from one end of the tubular handle and its other end opening into the handle; a capillary tube having a self-sealing cap on one end thereof through which the pointed end of the needle is inserted to extend into the capillary tube, and heparin on the inner wall thereof, and a metal flea therein; a yieldable collar surrounding the capillary tube a spaced distance from the self sealing cap and adjacent the one end of the capillary tube; and a magnet encircling the capillary tube between the self-sealing cap and the yieldable collar, said magnet having a bore dimensioned to slide over the collar upon application of sufficient force to said magnet and deformation of the collar the yieldable collar being spaced from the self-sealing cap a distance just greater than the length of the magnet along the capillary tube. - View Dependent Claims (2)
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3. Apparatus for use in obtaining blood samples comprising
a capillary tube having a self-sealing cap on one end thereof through which the pointed end of a needle is adapted to be inserted; -
a coating of heparin on the inner wall of the capillary tube; a metal flea in said capillary tube; a yieldable collar surrounding the capillary tube a spaced distance from the self-sealing cap and adjacent the one end of the capillary tube; and a magnet encircling the capillary tube between the self-sealing cap and the yieldable collar, said magnet having a bore dimensioned to slide over the collar upon application of sufficient force to said magnet and deformation of the collar the yieldable collar being spaced from the self-sealing cap a distance just greater than the length of the magnet along the capillary tube.
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Specification