| 摘要 |
1,020,536. Photo-electric measuring apparatus; photometers. LAPS LJUNGBERG & CO. A.B. Nov. 9, 1962 [Nov. 30, 1961], No. 42375/62. Headings G1A and G1P. [Also in Divisions A5 and G2] In an apparatus for measuring the amount of blood or haemoglobin lost by a patient undergoing surgery, the swabs or other items containing the blood are placed in a known quantity of blood solvent liquid (for example an alkali) contained in the vessel 5 which liquid is then agitated and pumped to an analyser cell 14 where the amount of blood is photo-electrically determined. Before the blood soaked swabs are placed in the vessel 5 the liquid tight container 25 is filled with the pure solvent, the bladder 27 being collapsed. Some of this solvent through the valve 29 to fill the syringe 31. The solvent in the vessel 5 is then pumped through the pipe 9, the valve 10 and the pipe 11 back into the vessel 5. The orifice 12 on the pipe 11 causes pressure to rise on the pipe 26 thus dilating the bladder 27 which in turn ejects the pure solvent in the container 25 through the pipe 24, and the peripheral duct 42 in the valve 10 to fill the syringe 20. For calibration a light beam is passed through the transparent cell 14 (filled by means of a pipette with a sample of known dilution through the filter 16 to the photo-cell 17. A zero reading is obtained by replacing the known sample with pure solvent from the syringe 31 by rotating the valve 29, the piston 32, 33, 34 falling under its own weight. In use the swabs are placed in the vessel 5 and agitated by the stirrer 6. The valve 10 is rotated 90 degrees clockwise (Fig. 2 not shown) so that the peripheral duct 42 connects the pipes 9 and 13. The liquid to be tested is then pumped through the cell 14 and continuous readings taken on the meter 18. If the concentration of blood is large it is stated to be advantageous to stop the continuous flow, wash out the analyser cell 38 with pure liquid from the syringe 31 and to turn the valve 10 through an additional 90 degrees (Fig. 3 not shown) thus further diluting the solution remaining in the pipe 13 with the known quantity of solvent contained in the syringe 20. |
