Extracorporeal circulation of blood
First Claim
1. In an extracorporeal blood circulation system including:
- a blood withdrawing line,an artificial lung provided on the line,a reservoir for the blood withdrawn,a blood supply line for sending out the blood from the reservoir, anda blood supply pump provided on the blood supply line;
an apparatus for adjusting the amount of blood to be withdrawn comprising;
means for detecting that the venous pressure has exceeded a predetermined upper limit level,a blood withdrawing pump provided on the blood withdrawing line, a shunt line connecting the reservoir to the inlet side of the blood withdrawing pump, a valve provided on the shunt line and usually open, and a valve control circuit for closing the valve when the venous pressure has exceeded the upper limit level.
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Accused Products
Abstract
An extracorporeal blood circulation system including a line for withdrawing the venous blood from the patient, an artificial lung provided on the line, a reservoir for the blood withdrawn, a blood supply line for sending out the blood from the reservoir to the artery of the patient, and a blood supply pump provided on the blood supply line and serving as an artificial heart. The amount of blood to be supplied is automatically controlled to maintain the arterial pressure of the patient in a suitable required range. The blood supply pump is stopped when the arterial pressure of the patient measured is above a predetermined upper limit value, while the pump is driven when the arterial pressure has lowered to a level below a lower limit value. The amount of blood to be withdrawn is also controlled automatically to keep the central venous pressure of the patient approximately constant. The blood withdrawing line has a blood withdrawing pump. The reservoir is connected to the inlet side of this pump by a shunt line having a valve which is usually opened. The valve is closed when the central venous pressure exceeds a predetermined upper limit level. A vertical overflow tube detects the central venous pressure exceeding the upper limit level.
145 Citations
18 Claims
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1. In an extracorporeal blood circulation system including:
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a blood withdrawing line, an artificial lung provided on the line, a reservoir for the blood withdrawn, a blood supply line for sending out the blood from the reservoir, and a blood supply pump provided on the blood supply line;
an apparatus for adjusting the amount of blood to be withdrawn comprising;means for detecting that the venous pressure has exceeded a predetermined upper limit level, a blood withdrawing pump provided on the blood withdrawing line, a shunt line connecting the reservoir to the inlet side of the blood withdrawing pump, a valve provided on the shunt line and usually open, and a valve control circuit for closing the valve when the venous pressure has exceeded the upper limit level. - View Dependent Claims (2, 3, 4, 5)
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- 6. A system for controlling a pulsatile pump provided on an extracorporeal circulation line, the system comprising means for generating a trigger pulse upon detecting contraction of the heart of a patient for spontaneous circulation, a circuit for generating a trigger pulse in accordance with a heart rate set for forced circulation, means for selecting one of the trigger pulses, and means for driving the pulsatile pump in response to the selected trigger pulse.
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11. In an extracorporeal blood circulation system including a blood withdrawing line, an artificial lung provided on the line, a reservoir for the blood withdrawn, a blood supply line for sending out the blood from the reservoir, and a blood supply pump provided on the blood supply line heart, an apparatus for adjusting the pressure of the left atrium comprising:
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means for detecting that the venous pressure has exceeded an upper limit level, means for increasing the amount of blood to be withdrawn when the venous pressure has exceeded the upper limit level, means for detecting the pressure of the left atrium, and means for varying the upper limit level for the venous pressure in accordance with the pressure of the left atrium to maintain the pressure of the left atrium in a predetermined range.
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12. A system for circulating the blood extracorporeally comprising:
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a blood withdrawing line, an overflow line, a reservoir for the blood withdrawn and overflowed, a pump for leading the overflow of blood into the reservoir, a cannula comprising an outer tube having a slightly tapered forward end being formed with a number of holes and rear end connected to the withdrawing line, and an inner tube having a forward end being opened at the forward end of the outer tube and rear end extending outward from the outer tube, and blood overflowing means having two vertical tubes communicating with each other at their upper ends, at least one of the vertical tubes being opened to the atmosphere at its upper end, wherein one of the vertical tubes being connected at its lower end to the rear end of the inner tube of the cannula and the other being connected at its lower end to the overflow line. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A cannula for use in an extracorporeal blood circulation system comprising an outer tube having a slightly tapered forward end being formed with a number of holes and rear end, and an inner tube having a forward end being opened at the forward end of the outer tube and rear end extending outward from the outer tube.
Specification