Capillary tube holder for test instruments especially blood tests and particularly for platelet counters, with two coaxial chambers

• US 4,738,827 A
• Filed: 05/06/1986
• Issued: 04/19/1988
• Est. Priority Date: 05/07/1985
• Status: Expired due to Fees

• Current Assignee: S E A C SRL
• Original Assignee: Seacsrl
• Inventors: Pierotti, Romano
• Primary Examiner(s): Marcus, Michael S.
• Application Number:
  US06/860,055
• Time in Patent Office: 714 Days
• Field of Search: 73/864.72, 73/864.91, 73/864.02, 73/864.34, 128/760, 128/763, 128/765, 422/99, 422/100, 422/102, 422/104
• US Class Current: 422/562
• CPC Class Codes: G01N 15/131 Details G01N15/13 takes precedence

Abstract

The phial or vial holding for a capillary tube is internally subdivided into an external chamber having annular cross-section and an internal chamber having circular cross-section. The outer wall of the chamber of annular cross-section carries a capillary hole and the inner tubular wall separating the two chambers has a hole in alignment with that of the outer wall and of larger diameter. In the hollow space of annular cross-section, a slight entrained flow through the hole of the inner wall and consequently a fast removal of the sample liquid which has passed through the capillary hole takes place. This is without backward flow in the direction of the capillary hole.

Claims

1. A capillary tube holder for test instruments comprising, a cylindrically shaped housing having an open upper end, a closed bottom end and capillary port means in an outer wall of the housing adjacent to said closed bottom end;

tubular wall means disposed in said housing and dividing an internal volume of said housing into a first centrally disposed chamber and a second concentrically disposed annular chamber, said tubular wall means having one end thereof in contact with said bottom end and having port means adjacent said one end thereof and lying upon a common plane that extends through said capillary port means, said tubular wall port means having a larger cross-sectional flow area then said capillary port means; and

closure means adapted to be received in said open end of said housing, said closure means have two inlet means adapted for receiving conduit means and guiding a respective conduit into each of said first and second chambers and an outlet means for connection of said housing to suction means.

2. A capillary tube holder for test instruments comprising, a cylindrically shaped housing having an open upper end, a closed bottom end and capillary port means in an outer wall of the housing adjacent to said closed bottom end;

tubular wall means disposed in said housing and dividing an internal volume of said housing into a first centrally disposed chamber and a second concentrically disposed annular chamber, said two chambers being in communication one to the other at the upper end of said housing, said tubular wall means having one end thereof in contact with said bottom end and having port means which are coaxial to said capillary port means, said tubular wall port means having a larger cross-sectional flow area then said capillary port means; and

closure means adapted to be received in said open end of said housing, said closure means have a plurality of inlet and outlet means, two of said inlet means adapted for receiving conduit means and guiding a respective conduit into each of said first and second chambers and an outlet means for connection of said housing to suction means.

3. A capillary tube holder for test instruments comprising, a cylindrically shaped housing having a closed upper end, a closed bottom end and capillary port means in an outer wall of the housing;

tubular wall means disposed in said housing and dividing an internal volume of said housing into a first centrally disposed chamber and a second annular chamber, said two chambers being in communication one to the other at the upper end of said housing, said tubular wall means having one end thereof in contact with said bottom end and having port means which are coaxial to said capillary port means, said tubular wall port means having a larger cross-sectional flow area than said capillary port means; and

said closed upper end of said housing having a plurality of inlet and outlet means, two of said inlet means adapted for receiving conduit means and guiding a respective conduit into each of said first and second chambers and an outlet means for connection of said housing to suction means.