Apparatus for removing water from blood
First Claim
1. In an apparatus for removing water from blood including an extracorporeal circulation circuit, said extracorporeal circulation circuit having a blood inlet side and a blood outlet side, a supply line on the blood inlet side and having an upstream end and a downstream end, an offtake line on the blood outlet side and having an upstream end and a downstream end, and a filter having a filtrate side and a blood side, said filter being connected to said downstream end of said supply line and said upstream end of said offtake line, said upstream end of said supply line and said downstream end of said offtake line being connected to at least one blood connection, said supply line including therein a blood pump, a first clamp disposed upstream of said blood pump and a second clamp disposed downstream of said blood pump, said offtake line further including therein a third clamp, the improvement comprising:
- a filtrate connection (38) on said filtrate side connected to said filter (32);
an inlet tube (54) connected to said filtrate connection (38);
means for limiting the volume of water removed from blood in the circuit in one machine cycle to a predetermined volume V2, said limiting means comprising an ultrafiltrate measuring chamber (56), said ultrafiltrate measuring chamber having an inlet connection coupled to said inlet tube (54) and an outlet connection, said ultrafiltrate measuring chamber (56) being coupled at its inlet connection through said inlet tube (54) to said filtrate connection and having a restricted maximum intake volume V2 ;
an inlet tube (70) coupled to said outlet connection;
a fourth clamp (58) on said inlet tube (54) and a fifth clamp (74) on said outlet tube (70); and
control means (126) coupled to said first clamp, to said second clamp, to said third clamp, to said fourth clamp and to said fifth clamp, said control means (126) being operative to open and close said first clamp and said second clamp in opposition to one another, to open and close said third clamp in synchronism with said second clamp, to open and close said fourth clamp in synchronism with said second clamp, and to open and close said fifth clamp in synchronism with said third clamp, said control means being presettable to actuate said clamps (46, 48, 50, 58,
74) during a treatment to specify total amounts of fluid to be withdrawn from a patient through said ultrafiltrate measuring chamber;
and wherein said blood pump includes a pump chamber (20) in said extracorporeal circulation circuit, the maximum intake volume V1 of the pump chamber (20) and the maximum intake volume V2 of the ultrafiltrate measuring chamber (56) are in a ratio of between 5;
1 and 2;
1, thereby controlling the ratio of the amount of blood pumped in a machine cycle to the amount of water removed in a machine cycle.
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Accused Products
Abstract
Apparatus for removing water from blood, advantageously by the single-needle method, in which by means of an air-operated bellows pump blood is sucked into an expandable pump chamber and thereafter water is forced into a hemofilter and collected in an ultrafiltrate measuring chamber to which a collecting bag is connected. The inlet and the outlet of the ultrafiltrate measuring chamber to which a collecting bag is connected. The inlet and the outlet of the ultrafiltrate measuring chamber can be opened and closed by clamps controlled in opposite phase and the amount of ultrafiltrate collected in the ultrafiltrate measuring chamber can be controlled and determined. The ultrafiltrate measuring chamber is divided by a hose-like wall into two chamber portions, one chamber portion receiving filtrate and the other chamber portion being adapted in a preferred embodiment to receive infusion solution. Thus, the infusion solution can be proportioned and supplied to the patient in volume equivalent manner.
101 Citations
22 Claims
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1. In an apparatus for removing water from blood including an extracorporeal circulation circuit, said extracorporeal circulation circuit having a blood inlet side and a blood outlet side, a supply line on the blood inlet side and having an upstream end and a downstream end, an offtake line on the blood outlet side and having an upstream end and a downstream end, and a filter having a filtrate side and a blood side, said filter being connected to said downstream end of said supply line and said upstream end of said offtake line, said upstream end of said supply line and said downstream end of said offtake line being connected to at least one blood connection, said supply line including therein a blood pump, a first clamp disposed upstream of said blood pump and a second clamp disposed downstream of said blood pump, said offtake line further including therein a third clamp, the improvement comprising:
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a filtrate connection (38) on said filtrate side connected to said filter (32); an inlet tube (54) connected to said filtrate connection (38); means for limiting the volume of water removed from blood in the circuit in one machine cycle to a predetermined volume V2, said limiting means comprising an ultrafiltrate measuring chamber (56), said ultrafiltrate measuring chamber having an inlet connection coupled to said inlet tube (54) and an outlet connection, said ultrafiltrate measuring chamber (56) being coupled at its inlet connection through said inlet tube (54) to said filtrate connection and having a restricted maximum intake volume V2 ; an inlet tube (70) coupled to said outlet connection; a fourth clamp (58) on said inlet tube (54) and a fifth clamp (74) on said outlet tube (70); and control means (126) coupled to said first clamp, to said second clamp, to said third clamp, to said fourth clamp and to said fifth clamp, said control means (126) being operative to open and close said first clamp and said second clamp in opposition to one another, to open and close said third clamp in synchronism with said second clamp, to open and close said fourth clamp in synchronism with said second clamp, and to open and close said fifth clamp in synchronism with said third clamp, said control means being presettable to actuate said clamps (46, 48, 50, 58,
74) during a treatment to specify total amounts of fluid to be withdrawn from a patient through said ultrafiltrate measuring chamber;and wherein said blood pump includes a pump chamber (20) in said extracorporeal circulation circuit, the maximum intake volume V1 of the pump chamber (20) and the maximum intake volume V2 of the ultrafiltrate measuring chamber (56) are in a ratio of between 5;
1 and 2;
1, thereby controlling the ratio of the amount of blood pumped in a machine cycle to the amount of water removed in a machine cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. In an apparatus for removing water from blood including an arteriovenous extracorporeal circulation circuit, said extracorporeal circulation circuit having a blood inlet side and a blood outlet side, a supply line on the blood inlet side and having an upstream end and a downstream end, and offtake line on the blood outlet side and having an upstream end and a downstream end, and a filter which is connected to said downstream end of said supply line and said upstream end of said offtake line, said upstream end of said supply line and said downstream end of said offtake line being connected to at least one blood connection, said supply line including a therein a blood pump, a first valve means disposed upstream of said blood pump and a second valve means disposed downstream of said blood pump, said offtake line further including therein a third valve means, said filter (32) having a filtrate side and a filtrate connection (38), the improvement comprising:
- means for limiting the volume of water removed from blood in the circuit in one machine cycle to a predetermined volume V2, said limiting means including an ultrafiltrate measuring chamber (56), said ultrafiltrate measuring chamber (56) having an outlet conduit (70) and an inlet conduit (54) and being coupled through said inlet conduit (54) to said filtrate connection, said ultrafiltrate measuring chamber (56) having a restricted maximum intake volume V2 ;
a fourth valve means (58) in said inlet conduit (54) and a fifth valve means (74) in said outlet conduit (70);
control means (126) coupled to said first valve means, to said second valve means, to said third valve means, to said fourth valve means and to said fifth valve means, said control means (126) being operative to open and close said first valve means and said second valve means in opposition to one another, to open and close said third valve means in synchronism with said second valve means, to open and close said fourth valve means in synchronism with said second valve means, and to open and close said fifth valve means in synchronism with said third valve means, said control means being presettable to actuate said valve means (46, 48, 50, 58,
74) during a treatment to specify total amounts of fluid to be withdrawn from a patient through said ultrafiltrate measuring chamber;
an air separator chamber (42) in said offtake line (40);
a throttling means (142) in said offtake line (40) between said filter 32 and said air separator (42);
an infusion bag (146) in fluid communication with said air separator (42);
wherein said control means (126) is coupled to said throttling means (52) to constrict said offtake line (40) in a controlled manner, and wherein said blood pump includes a pump chamber (20) in said supply line of said extracorporeal circulation circuit and the maximum intake volume V1 of the pump chamber (20) and the maximum intake volume V2 of the ultrafiltrate measuring chamber (56) are in a ratio of between 5;
1 and 2;
1, thereby controlling the ratio of the amount of blood pumped in a machine cycle to the amount of water removed in a machine cycle. - View Dependent Claims (21, 22)
- means for limiting the volume of water removed from blood in the circuit in one machine cycle to a predetermined volume V2, said limiting means including an ultrafiltrate measuring chamber (56), said ultrafiltrate measuring chamber (56) having an outlet conduit (70) and an inlet conduit (54) and being coupled through said inlet conduit (54) to said filtrate connection, said ultrafiltrate measuring chamber (56) having a restricted maximum intake volume V2 ;
Specification