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US 4,396,024 AGranted
Device for the extraction of capillary blood
OwnerWalter Sarstedtinventor
Life of this patent
Estimating the term…
Abstract
In a device for the extraction of capillary blood including a capillary open at both ends and being of a predetermined volume, having a capillary effect at least at the front end thereof, a holder is integrally connected to said capillary which is provided with one or more windows. For avoiding dosage errors, a closure pin for the rear end of the capillary or in a modification a rear transverse wall having one or more air exit apertures is provided.
Claims12
A device for the extraction of capillary blood comprising:
- a capillary portion having front and rear ends;
- a capillary passage extending between said front and rear ends;
- a first opening a said front ends for the introduction of blood into said capillary passage by capillary action;
- a second opening at said rear end for venting said capillary passage;
- a holder at said rear end for supporting said capillary portion and having an outer surface;
- a closure pin axially movable within said holder between a first position in which said pin restricts the size of said second opening and a second position in which said pin does not restrict the size of said second opening;
- and
- window means in said holder communicating between said second opening and said outer surface.
5 more elements
A device for the extraction of capillary blood comprising:
- a capillary portion having front and rear ends;
- a capillary passage extending between said front and rear ends;
- an opening at said front end for the introduction of blood by capillary action into said capillary passage;
- a holder at said rear end for supporting said capillary portion and having an outer surface;
- a closure pin having an end face;
- an opening into said capillary passage at said rear end wherein said closure pin face and said rear end opening cooperate to define an air exit aperture smaller in area than said capillary passage;
- window means in said holder communicating between said air exit aperture and said outer surface;
- and
- a guide and retaining rod integrally connected with said closure pin, said guide and retaining rod being displacable in an axial direction relative to said holder.
6 more elements
Dependencies are inferred from the claim text.