Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1988-10-24
1990-12-18
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
128DIG26, 128760, A61M 532
Patent
active
049783424
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a plaster, i.e. a prepared bandage in the form of an exudate-absorptive, adhesive-backed dermal patch for use while collecting a blood sample from an animate subject using a transcutaneous cannula, e.g. a hollow needle connected to a suction means.
In conventional blood sampling, immediately after penetration of the subject's dermis, e.g. of a fingertip, capillary blood and other dermal and tissue fluids are secreted. Since the object generally is to collect a sample of venous blood uncontaminated by the initial exudate, it is conventional to not collect the initial exudate, but to wipe it off, or to let it flow over the fingertip and drip off, e.g. onto the floor.
In this way, the bloody initial exudate is transferred to areas surrounding where the sample is taken.
In view of present requirements for improved hygiene, and to some extent in connection with public health concerns for the spread of hepatitis and AIDS, there is a need in the art for means for providing increased safety and hygiene in connection with taking blood samples. Further, there is a need in the art for means for facilitating the taking of venous blood samples little contaminated by initial exudate.
SUMMARY OF THE INVNETION
The present invention provides a prepared bandage designed to be stuck onto a subject's skin at a site where a blood sample is to be taken. The bandage includes a patch with an opening through it, the opening being surrounded by an outwardly projecting annular collar made of body fluid exudate-impermeable material. The collar thus provides a sump or well, in which is fitted a plug of body fluid absorptive material. In use, as the subject's skin, under the well, is punctured by a cannula, the initial exudate of capillary blood and other dermal and tissue fluids are absorbed into the plug of absorptive material, so that a relatively uncontaminated sample of venous blood can be collected through the cannula, without spreading and dripping of initial exudate fluid around the site of the sampling area.
The term cannula is used generically herein for whatever means is used to draw the subject's blood, since the particular means used is not part of the present invention.
BRIEF DESCRIPTION OF THE DRAWING
The invention may be better understood with reference to the attached drawing showing a preferred embodiment of the device of the present invention.
In the Drawing:
FIG. 1 is a longitudinal vertical cross-sectional view of an exudate-absorptive, adhesive-backed dermal patch for use while collecting a blood sample, this article being made in accordance with principles of the present invention;
FIG. 2 is a longitudinal perspective view thereof similar to FIG. 1, but with the absorptive plug thereof removed to expose other details; and
FIG. 3 is a top plan view of the partly disassembled structure shown in FIG. 2.
DETAILED DESCRIPTION
The plaster, i.e. prepared bandage 10 of the present invention comprises a strip 4 which is conventionally adhesive-backed, as at 6, so it can be stuck onto a subject's skin 7, surrounding the site 8 where a blood sample is to be taken.
At the site 8, the strip 4 has an opening 3 provided through it. An annular collar 1 is securely provided on the strip 4, so that the collar 1 extends outwards from the outer surface of the strip. The strip 4 and the collar 1 are made of a material, such as is conventionally used in manufacturing of strip-type prepared bandages, that is substantially impermeable to liquid exudate fluid expected from puncturing of the skin and subcutaneous tissue for taking a venous blood sample.
The radially inner surface 2 of the collar 1, together with the corresponding peripheral surface of the opening 3 provides a sump or well, the bottom of which is provided by the outer surfaces of the subject's skin 7.
The sump is fitted with a cylindrical plug 5 made of conventional absorptive material capable of absorbing liquid exudate expected from puncturing the skin and subcutaneous tissue for taking a venous blood
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Daley Kathleen A.
Rosenbaum C. Fred
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