摘要:
A method and an apparatus are described for testing sensors of the same type for measuring a specific quantity, in particular for testing differential pressure sensors with a reference side and a measurement side. A pressure of predetermined value is applied simultaneously to the reference side of the sensors, and the output values of the sensors are compared.
摘要:
A method and an apparatus (40) for reducing the degradation of heat sensitive components in medical substances during heat sterilisation are described. The medical substances are contained in a multiple chamber recipient (10, 60) that comprises a first chamber (12) with a first medical substance and at least one second chamber (14, 50) containing an amount of a second medical substance that is smaller than that of the first medical substance. The multiple chamber recipient (10, 60) is heated to a predetermined temperature for sterilising the medical substances, and the second chamber (14, 50) with the second medical substance is thermally insulated during heating of the multiple chamber recipient (10, 60). The multiple chamber recipient (10, 60) is held at this temperature for a predetermined time and is subsequently cooled. A predetermined time after commencing heating of the multiple chamber recipient (10, 60) the thermal insulation of the second chamber (14, 50) is removed, so that a defined hold time of the second chamber (14, 50) at the sterilisation temperature is obtained.
摘要:
Method and apparatus for preventing protein loss with peritoneal dialysis. A spent PD solution located in a drain bag (17) is separated in a filter (21) into a protein-rich retentate fraction (35) and a protein-lean filtration fraction (37). The protein-rich fraction is supplied to a protein bag (25) and from there to a fresh PD solution in a heater bag (13) intended to be fed into the patient. The protein-lean fraction is led to a waste receiver.
摘要:
Method and device for monitoring of an infusion pump in a machine for hemodiafiltration or hemofiltration. The machine comprises a first flow circuit for a dialysis solution with a flowmeter arranged in the flow circuit. In addition, there is a second flow circuit for blood. A dialyser or hemofilter is divided by means of a semi-permeable membrane into a first chamber which is connected to the first flow circuit and a second chamber which is connected to the second flow circuit. In addition, there is a third flow circuit from an outlet for dialysis solution in the first flow circuit to a connection in the second flow circuit and comprising an infusion pump. The dialyser is disconnected by means of a valve from the first flow circuit so that the infusion pump is connected in series with the flowmeter in the first flow circuit. The monitoring of the infusion pump takes place by comparing the expected flow through the infusion pump with the measured flow through the flowmeter.
摘要:
Method and device for measuring the flow differential between incoming liquid flow to a dialysis machine and outgoing liquid flow from a dialysis machine, as well as a method for calibration of the device. The dialysis machine comprises a heat exchanger (10) for transfer of heat energy from the outgoing (29) to the incoming (8) liquid flow, a connection (23,24) to a dialyser (2) for feeding the dialysis solution through the dialysate side of the dialyser, a device (20, 28) for attaining an ultrafiltration in the dialyser, and a plurality of temperature sensors (30,31;32,33) for detecting the temperature of the dialysis solution. The flow differential is calculated with help of the equation ΔQ = Q x (ΔT 1 - ΔT 2 )/ΔT 2 where ΔQ = the flow differential, Q = the liquid flow, ΔT 1 = temperature difference across one side of the heat exchanger and ΔT 2 = temperature difference across the other side of the heat exchanger. Calibration takes place with built in concentrate pumps (6,16,18).
摘要:
The present invention relates to a system, respectively a method for measuring the concentration of a substance in a solution or dispersion thereof, whereby the substance consists of a compound which is non-electrically conducting or very slightly conducting. The invention is primarily intended to be used for measuring the concentration of compounds or substances of medical interest, for example urea concentration in blood of a patient during for example hemodialysis, hemofiltration or hemodiafiltration. The conversion of the compound hereby occurs with a help of urease.
摘要:
A control apparatus is described comprising: a plurality of microprocessors (44,50); a plurality of storage registers (46,52), the number of storage registers being at least equal to the number of said microprocessors, one of said storage registers being associated with each of said microprocessors, each of said microprocessors being arranged to control and/or monitor the same common parameters (xxx,yyy), each of said microprocessors applying values of control constants stored in the associated storage register in monitoring and/or controlling said parameters; manually controllable input means (6) for supplying new values of said control constants. The control apparatus according to the invention is intended primarily for the control of hemodialysis, that is to say the purification of the blood of patients with diminished renal function or wholly lacking such function. The control apparatus according to the invention is characterized by digital duplication means (48) for digitally duplicating the new values of the said control constants supplied by said input means (6) and entering said duplicated values into all of said storage registers (46,52), whereby identical values for said control constants are entered into all of said storage registers; and display means (9,10) for displaying said new values of said control constants as entered into at least one of said storage registers.
摘要:
An auto transfusion system for the collection, treatment and return of a patient's blood, comprising means for performing the respective steps, for example, a suction device (1) for drawing up blood and, where present, any rinsing fluids from an operation site or similar, a source (2) of anticoagulant, a source (2) of diluent, a collection vessel (3) for the to-be-treated blood, a filter (5) for the removal of a filtrate comprising a quantity of the diluent, and a storage vessel (8) for the treated blood. The system according to the invention is primarily characterized in that the said sources consist of a common storage vessel (2) for a mixture of anticoagulants and diluents. The system can further comprise a measuring device (9) for measuring the haematocrit- and/or Hb value of the treated blood.