64 results about "Venous line" patented technology

The invention concerns a dialysis machine (10) comprising a dialyzer (20) having a first inlet (21) and a first outlet (22) for the bloodstream, dialysate supply mechanism (25), an arterial line (16) connected between the patent's arteriovenous fistula and the dialyzer, a venous line (17) connected between the arteriovenous fistula and the dialyzer, a pump (28) coupled with the arterial line, a dialysate supply line (31), connected between the dialysate supply mechanism and the dialyzer, a dialysate evacuation line (33) connected between a dialysate recuperating container (27) and the dialyzer. The sterile dialysate bags are arranged in a chamber (26) under a gas pressure.

A method and apparatus for priming an extracorporeal blood circuit, in which the patient end of an arterial line (79) is connected to a first discharge port (61), and the patient end of a venous line (87) is connected to a second discharge port (62). The two discharge ports are connected to a used dialysate line which connects a dialyser (33) to a drain. The arterial and venous lines are filled with a priming fluid, while the air contained in the arterial and venous lines is evacuated partly through the first discharge port and partly through the second discharge port. Two check valves (65, 66) prevent flow from the used dialysate line towards the two discharge ports. The invention reduces the risk of errors on the part of an operator readying the priming configuration, as well as the risk of contamination of the extracorporeal circuit during the priming phase.

Venous reservoirs are interposed between the patient and the arterial pump and serve to remove air bubbles and provide compliance that accommodates variations in the volume of blood circulating in the extracorporeal circuit during cardiopulmonary bypass (CPB). The invention is a reservoir that incorporates automated means to remove air bubbles from the venous line prior to the blood entering the arterial blood pump. In another form, the reservoir includes means that handles foam prior to the blood entering the blood pump. In yet another form, the invention is means that improve air removal in a soft shell venous reservoir. These features are applicable to CPB circuits using gravity drainage or vacuum assisted venous drainage.

A method and apparatus for determining a fluid flow rate blood access having an upstream position and a downstream position using a dialysis system. The dialysis system includes a dialyzer having a semi permeable membrane delimiting a first chamber through which blood removed from said blood access passes, and a second chamber through which dialysis liquid passes. In addition, an arterial line and a venous line are connected to an inlet and an outlet of the first chamber, respectively.

The object of the present invention is the filtration of blood in order to selectively separate and extract molecules of a given size via extracorporeal systems for separating substances. The invention thus concerns an extracorporeal blood treatment device including: one or more exchangers (1) comprising a first inlet (2) for the blood to be treated, a first fluid outlet (4) and a second fluid outlet (5), an inlet line (10) for the blood to be treated, connected to the first inlet (2) of the exchanger (1), a blood outlet line (or venous line) (11) coupled to the first outlet (4) of the exchanger (1), one or more treatment units (21) comprising at least a first fluid inlet (22) and at least a first fluid outlet (24), wherein the second outlet (5) of the exchanger (1) is in fluid communication with the first inlet (22) of the treatment unit (21), the invention being characterised in that the first outlet (24) of the treatment unit (21) is in fluid communication with the inlet line (10).

Indicator dilution techniques are used to measure vascular access flow rates during routine hemodialysis. A bolus injection port is used to infuse a specific volume (V.sub.i) of an indicator diluent, such as saline or dye, into the patient cardiovascular circuit by one of the following: 1. Needle injection of a known volume (bolus) of indicator diluent directly into the access site in the presence or absence of the hemodialysis circuit. 2. Infusion of an indicator diluent into the arterial, venous line upstream of the venous needle. 3. Turning the ultrafiltration of the dialysis delivery system from OFF to ON and OFF again over a predetermined time period. 4. In a hemodialysis circuit, turning on the hemodialysis pump and using the priming saline volume as a single saline bolus. A transdermal sensor is used to measure the percent change in a blood parameter. The sensor is positioned directly over the vascular access site a prescribed distance downstream of the injection site and upstream of the access-vein connection. The sensor employs emitter and detector elements at multiple spacings (d.sub.1, d.sub.2) for the purpose of measuring the bulk absorptivity (.alpha.) of the area immediately surrounding and including the access site, and the absorptivity (.alpha..sub.0) of the tissue itself.

The measurement of blood flow in a dialysis shunt is obtained by injection of an indicator material into a venous line leading from dialysis equipment to the shunt. The blood flow in an arterial line leading from the shunt at a location downstream of the venous line to the dialysis equipment is monitored by an arterial line sensor for the presence of the indicator material. A detector connected to the sensor provides a dilution curve in response to the presence of the indicator material and the blood flow in the shunt is calculated from the area under the dilution curve. The locations of the arterial and venous lines in the shunt can be reversed to obtain a measurement of blood recirculation from the venous line into the arterial line.

A method for priming a blood tubing set having a venous line and an arterial line whose connections at the patient side are in communication with two separate inlets of a chamber of, in particular, a bag and whose connections at the machine side are in communication with a dialyzer. The method includes the steps of parallel filling of both the venous and the arterial lines via a feed line so that priming liquid flows through both inlets into the chamber; and circulation of the priming liquid in the circuit of the lines, the dialyzer and the chamber via a pump so that one of the inlets of the chamber acts as an inlet and the other as an outlet.

A measurement method for determining the blood flow rate Q_F in blood carrying lines is provided. It may be used in particular to determine the blood flow in a patient's vessel, which is connected to the extracorporeal circulation of a blood treatment machine by an arterial line and a venous line. According to the method, the net rate dX/dt of a variable X is determined, with X being derived from a physicochemical variable Y of the blood with the help of values Y_A and Y_V which are adequately constant over time and which respectively characterize the physicochemical property in the arterial line and the venous line during the measurement interval. The net rate dX/dt is then used to determine the blood flow rate Q_F. The targeted use of indicators is not necessary.

The invention provides a hand dorsum vein image identification processing method and a hand dorsum vein image identification processing device. Binarization processing of acquired hand dorsum vein images is carried out to acquire binary images including hand dorsum venous lines. The image integration processing of a plurality of rotated binary images is carried out along the vertical axes of the binary images, and a plurality of integral vectors are acquired. The normalization processing of the plurality of integral vectors is carried out to acquire the binary integral images of the binary images. The two-dimensional discrete cosine transform processing of the binary integral images is carried out to acquire low-frequency images, and to-be-identified characteristics are extracted from the low-frequency images. The binary images are rotated a plurality of times, and the image integration processing of the binary images is carried out after each time of rotation, and therefore the characteristic accuracy of the finally-acquired to-be-identified characteristics is higher, the characteristic stability thereof is stronger, and therefore the robustness of identification results of identity identification adopting the to-be-identified characteristics is higher.

The invention relates to a puncture practice device for nurses. A separate water tank with multiple interfaces, a storage battery, a vibration module and a power supply interface with switches are installed in the chest and abdominal cavity of the human body model frame device. Magnetic induction switches are installed on the corresponding positions of the sacral plexus, lumbar plexus, sciatic nerve, femoral nerve, etc., and two booster pumps are installed in the separated water tank and hold liquids of different colors, which are respectively connected to the corresponding silicone arterial tube and silicone venous tube. When you need to practice injection puncture, turn on the switch, the booster pump works, and the water in the separated water tank flows into the silicone arterial tube and the silicone venous tube connected to it. The color of the blood returns to distinguish the arteries and veins. When the corresponding nerve or nerve plexus is pierced, the vibration module starts to vibrate. To achieve the purpose of improving the operation skills by practicing puncture by the simulated person.