US3878567A - Self-contained artificial heart - Google Patents
Self-contained artificial heart Download PDFInfo
- Publication number
- US3878567A US3878567A US481578A US48157874A US3878567A US 3878567 A US3878567 A US 3878567A US 481578 A US481578 A US 481578A US 48157874 A US48157874 A US 48157874A US 3878567 A US3878567 A US 3878567A
- Authority
- US
- United States
- Prior art keywords
- ventricles
- blood pressure
- rate
- range
- stroke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
- A61M60/871—Energy supply devices; Converters therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/196—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body replacing the entire heart, e.g. total artificial hearts [TAH]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/424—Details relating to driving for positive displacement blood pumps
- A61M60/438—Details relating to driving for positive displacement blood pumps the force acting on the blood contacting member being mechanical
- A61M60/449—Details relating to driving for positive displacement blood pumps the force acting on the blood contacting member being mechanical generated by a solenoid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/515—Regulation using real-time patient data
- A61M60/531—Regulation using real-time patient data using blood pressure data, e.g. from blood pressure sensors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
- A61M60/89—Valves
- A61M60/892—Active valves, i.e. actuated by an external force
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3334—Measuring or controlling the flow rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
Definitions
- a small, self-contained blood pump includes a UNITED STATES PATENTS physiologically-responsive beat rate control system 1 048 165 8/l967 Norm i 1 i H1 and a pulmonary edema protection system. 3.379.191 4/1968 Harvey 3/1.7 2 aims.
- This invention relates generally to a single unit mechanical device capable of circulating blood in the human body in place of a human heart and capable of surgical implantation in the thoracic cavity in a single operation.
- thermoelectric module allowing close simulation of the functions of a human heart by electrical control of pumping rate and pulmonary to systemic pumping ratio in response to physiological need.
- Another object is to provide an artificial heart which is more efficient and longer lasting than previous devices.
- Another object is to provide an artificial heart which is lighter than previous devices.
- the invention is a self-contained artificial heart including an electronic control circuit adapted to simulate a natural hearts action by varying the pulse and flow rate in response to a physiological variable.
- FIG. I is a longitudinal section taken approximately on the line l-1 of FIG. 2 ofa self-contained artificial heart constructed in accordance with one embodiment of the invention
- FIG. 2 is a cross-section taken on the line 2-2 of FIG. 1;
- FIG. 3 is a fragmentary plan view of the left hand end portion of FIG. 1;
- FIG. 4 is a diagrammatic one half plan view taken on the line 44 of FIG. 2:
- FIG. 5 is a part sectional and part elevational view illustrating the piston and cylinder and associated right and left artificial ventricles in compressed position:
- FIG. 6 is a circuit diagram of the beat rate and stroke length control system
- FIG. 7 is a circuit diagram of the right ventricle blood inlet valve control system:
- FIG. 8 is a circuit diagram of the feedliquid pump control system:
- FIG. 9 is a schematic of the electrical and working fluid flow system.
- the device 10 contains a source of thermal energy 11 preferably a radioisotope and most preferably a compound of plutonium.
- a thermoelectric converter 12 is in proximity to the thermal energy source 1] and functions to convert a first portion of the thermal energy from Pu compound II to electrical energy.
- the working fluid may be any one suitable for use in a Rankine cycle engine such as hydrocarbon.
- halogenated hydrocarbons such as that family of compounds known as the Freons.” or water.
- the working fluid is changed from its liquid to its gaseous state in the boiler 13 by a second portion of the thermal energy and is passed to an expansion zone 14 established by stationary piston 15 and reciprocally movable cylinder head assembly 16 through a solenoid controlled inlet valve 17 in said stationary piston 15.
- the stationary piston 15 also contains a solenoid-operated exhaust valve 18.
- the cylinder head assembly 16 moves first away from the piston 15 when the inlet valve 17 is opened and the exhaust valve 18 is closed. and second toward the piston 15 when the exhaust valve 18 is opened and the inlet valve 17 is closed.
- ventricles l9 and 20 are compressed as shown in FIG. 5 as a result of the force of cylinder head assembly 16, blood is caused to be expelled as indicated by arrows 24 and 25 (respectively for ventricles l9 and 20) in FIG. 3 into both the systemic and the pulmonary systems of the mammal in which the blood pump is implanted.
- Blood. indicated by the arrow from the left artificial ventricle 20 is passed to a connection 26 to the patients aorta while blood 24 from the right artificial ventricle 19 is passed to a specially designed pulmonary artery connection 27 containing an outlet valve 28.
- the inlet 29 to this right artificial ventricle 19 preferably contains an electromagnetically controlled valve 30 to be described in more detail later in the specification.
- the aorta connection 26 also contains a valve 31 to prevent backflow of blood 25 in the opposite direction.
- the left ventricle 20 also contains a blood inlet valve 32 which allows blood 22 only to enter the left ventricle 20.
- pulmonary artery connection 27, left and right artificial ventricles 20 and 19 are constructed of any suitable medical grade material which is compatable with blood and body tissues.
- Natural and synthetic polymer materials such as polyurethane. dacron. hepranized silastic. and silicon polymers are merely exemplary; the particular material selected does not form a part of the present invention.
- a capillary condenser tube 33 is connected to the piston exhaust valve 18 and preferably has an inner surface lined with a fibrous metal wick 34.
- a wick-type of capillary lining may be formed from sintered titanium-aluminum-vanadium alloy.
- Exhaust vapor entering the condenser tube 33 at 36 (FIG. 9) condenses on the porous wick 34 and fills the wick pores.
- the condensate flows through the wick 34 to the exit 35 (FIG. 9) of the condenser and then through a subcooler 37 (FIG. 4) to the inlet 38 of the feedliquid pump 39.
- the condensate is retained in the wick by capillarity regardless of the position or attitude of the heart device.
- the capillary condenser 33 has a large surface area and rejects heat to an interstitial fluid 43 (FIG. I) which in turn rejects its heat to the blood in the ventricles l9 and 20 and maximizes the distribution of heat while minimizing the blood temperature rise.
- the feedliquid pump 39 is preferably driven by an electrically operated solenoid 40 driven by an electronic control system shown in FIG. 8 at a constant rate. From the feedliquid pump 39 the working fluid is passed back to the boiler 13 where it is vaporized again.
- thermoelectric module 12 is preferably a series of silicon-germanium semi-conductor thermocouples.
- the thermoelectric converter 12 provides electricity to electrical control circuits (shown in FIG. 6) which control the electromagnetic gas inlet valve 17 and the electromagnetic exhaust valve 18 in the piston 15 and which function to control precisely either or both the stroke length and the cylce rate of the movable cylinder head assembly 16.
- the electrical control circuit (FIG. 6) is adapted to vary the pulse rate and the stroke length in response to a physiological variable such as blood pressure. variations in which are detected by means of a sensor such as a pressure sensitive transistor thereby varying the rate of pumping of blood in response to the physiological variable. closely simulating the behavior of a natural human heart.
- the converter 12 also provides electricity for another electrical control circuit (shown in FIG. 7) which is preferably provided to control an electromagnetic valve 30 at the blood inlet 29 to the right artificial ven tricle l9 and is adapted to control the amount of blood indicated by arrow 23 (FIG. 3) entering the right ventricle 19.
- a sensor (not shown) of pulmonary blood pressure is provided which signals the control circuit (FIG. 7) when the pulmonary blood pressure rises above a predetermined level and causes the electromagnetic valve 30 to be closed until the pulmonary blood pressure drops to an acceptable level. Pulmonary edema is thereby effectively prevented because of the artificial hearts adaptability to change the systemic system to pulmonary system pumping rate ratio.
- a relief valve (FIG. 9) is provided to releaseexcess vapor from the boiler superheater 46 into the condenser 33 at 36 at a predetermined pressure.
- the source of thermal energy II previously mentioned is preferably a compound of Pa isotope and is shielded preferably by a platinum capsule 41 having an absolute filtered vent 42 (FIG. I to duct helium generated by said isotope 11 during the course of this decay directly into the interstitial fluid 43.
- the helium permeates the silastic covering 44 (FIG. 1) into the bloodstream.
- a microsphere fuel form is coated first with thoria and then with platinum-rhodium to form a ductile mass which withstands any credible impact as well as fire or any credible accident.
- An internal cylindrical bellows 47 and an external cylindrical bellows 48 are provided. one end of each being welded to the movable cylinder head 16 and the other end of each being welded to a stationary member 49 which is affixedly attached to the piston 15.
- the internal bellows 47 forms a hermetic seal to prevent any possible working fluid escape and to vent any vapor leakage past the cylinder 14 directly to the condenser 33.
- the artificial heart is controlled by circuitry respon sive to some physiological function such as the average blood pressure. filtered to eliminate the variations from beat to beat.
- some physiological function such as the average blood pressure. filtered to eliminate the variations from beat to beat.
- dotted lines enclose certain electronic functions. which have inter-relationships shown by the schematic diagram.
- a variable voltage signal indicative of the variations in blood pressure is regulated by the Right Atrial Pressure Sensor unit. there being a suitable transducer in the right atrium.
- the human body is thus a significant participant of the feedback loop.
- this average blood pressure signal varies both the stroke and the rate of the artificial heart. thus simulating the normal heart's capacity for increasing both the volume per beat and the rate of the pumping action.
- That portion of FIG. 6 within the dotted lines identified as Rate Control is a multivibrator. the rate of which is controlled by the average blood pressure.
- the Gas Inlet Control is an emitter coupled monostable vibrator. the pulse width of which is varied by the average blood pressure.
- the train of thus regulated pulses actuates a driven circuit identified as a Gas Inlet Switching Network whereby the gas inlet valve 17 solenoid is energized to control both the stroke and the rate of the reciprocating cylinder head assembly 16.
- the exhaust valve 18 is regulated by a solenoid energized through a Gas Exhaust Switching Network" driven by the signal from the Gas Exhaust Control.” the frequency of the pulses being the complimentary output of the "Rate Control” regulated by the feedback signal from the human body through the Right Atrial Pressure Sensor.”
- thermoelectric converter I2 energizes the circuits of FIGS. 6, 7. and 8. Within each set of dotted lines. any transistor described as a second transistor is the one on the right. the leftward transistor being called the first transistor.
- the reciprocation rate of the cylinder head assembly I6 is controlled by the rate at which the inlet valve 17 is opened. A less than maximum stroke length is achieved by shortening the duration of the opening of the inlet valve 17.
- the exhaust valve I8 is electrically actuated toward the open position during at least some portion of the cycle when the intake valve is not so actuated.
- the gas inlet valve solenoid is controlled by a Gas Inlet Switching Network.”
- a Gas Inlet Control is an emitter-coupled monostable vibrator whose pulse is triggered by the train of pulses from the "Rate Control," the pulse width being varied by the signal from the Right Atrial Pressure Sensor.
- the pumping capacity is increased in part as a result of in creasing the stroke by increasing the pulse width.
- the Gas Inlet Switching Network is a driver circuit comprising a first and second transistor. A positive current is directed through a diode. a resistor. the solenoid coil for the inlet valve 17 and the collector and emitter of the second transistor. The base of the second transistor is controlled by the emitter signal from the first transistor developed across a resistor voltage divider. The emitter of the second transistor is also connected 6' by two parallel capacitors to the collector through the solenoid winding in the valve 17 for the gas inlet. A diode in parallel with the solenoid winding for the valve 17 of the gas inlet serves to prevent any adverse effects from the intermittent potential in the solenoid.
- the low power signal from the Gas Inlet Control regulates both the frequency and duration of valve opening. and the switching network unit controls the flow of the higher power current to the solenoid of the valve 17.
- the Gas Inlet Control is an emitter-coupled monostable vibrator and includes two common emitter connected transistors. the emitters being maintained above ground by a resistor to ground.
- the base of a first transistor of the Gas Inlet Control is connected through a resistor to the collector of the second transistor. which provides an output signal from the Gas Inlet Control.
- the collectors of the first and second transistors of the gas inlet control are connected through their respective resistors to a positive potential.
- the signal on the collector of the first transistor is coupled to the base of the second transistor through a capacitor.
- the pulse width is increased when the heart rate is increased because the "Gas Inlet Control is modulated by the output signal of the right atrial pressure sensor. For example. such atrial signal can be connected through a resistor to the base of the second transistor.
- the Rate Control unit is an R-C coupled common emitter multivibrator.
- the base of each transistor is connected by a capacitor to the collector of the other transistor and by a resistor to the positive signal from the Right Atrial Pressure Sensor.” Similarly. the collector of each transistor is connected through a resistor to such positive signal from the "Right Atrial Pressure Sensor.
- the operation of the "Rate Control" unit can be clarified by noting that a positive signal from the Right Atrial Pressure Sensor is converted by the multivibrator to two trains of pulses at a rate of the general magnitude of a natural heart beat, the pulses from one side of the multivibrator being directed to the Gas Exhaust Control" and the other train of pulses from the other side of the multivibrator being directed to the "Gas lnlet Control.”
- the frequency of the multivibrator increases when the body needs more blood circulation as communicated by the positive signal from the Right Atrial Pressure Sensor.
- the Right Atrial Pressure Sensor includes a transducer responsive to the pressure in the right atrium. such transducer being associated with the base of the transistor in such unit.
- a voltage divider between the positive terminal of the source of electrical potential and ground provides a controlled voltage to the base.
- the emitter of the transistor is connected by a resistor to ground.
- the collector is connected by a resistor to the positive terminal of the source of electrical potential.
- the output signal at the collector is coupled to supply the positive potential for the multivibrator by an isolating diode in series with a resistor.
- a capacitor is connected between such resistor and ground.
- the Right Atrial Pressure Sensor provides a filtered signal (the beat to beat variations being rejected) which is a smoothly varying positive signal indicative of average atrial pressure. and this signal regulates the variations of both the Rate Control unit and the Gas Inlet Control" for controlling both the rate and stroke of the reciprocations of the cylinder head assembly 16. In this manner. the entire system closely simulates the response of a natural heart to right atrial pressure.
- the Gas Exhaust Control is similar in configuration and operation to the "Gas lnlet Control.- A signal consisting of a train of pulses from the multivibrator is applied to the base of the first transistor.
- the bias. however. is derived directly from the positive potential source. rather than from the positive output of the Right Atrial Pressure Sensor because the working fluid can flow through an open exhaust valve during the same fraction of a cycle without regard to whether the inlet valve was long open for a full stroke or a shorter time for a partial stroke.
- the Gas Exhaust Switching Network includes a transistor. the base of which is connected through a resistor to ground.
- the solenoid coil operating the gas exhaust valve is connected in series with the collector to the positive potential source.
- a diode bypasses the solenoid coil of the gas exhaust valve 18 to protect the transistor from a voltage spike when the solenoid current is interrupted.
- the pressure sensor at the right atrium provides a positive signal upon which is impressed the collector voltage developed by the base current generated by the right atrial pressure.
- the pulse rate of the Rate Control is controlled by the voltage ofthe Right Atrial Pressure Sensor" to provide a train of pulses to the Gas lnlet Control and the Gas Exhaust Control.”
- the respective gas inlet and exhaust switching networks are operated by their controls so that the valves are actuated at rates determined by the pressure in the right atrium. and the inlet switching network is additionally controlled to narrow the proportion of maximum pulse width sent to the gas inlet valve solenoid coil except when a predetermined high pressure of the right atrium is exceeded.
- the hearts pumping capacity is increased by increasing both the stroke of the cylinder head assembly l6 and the frequency or number of strokes per minute.
- FIG. 7 depicts a Pulmonary Edema Protector and is effectively a blood switching system which prevents the flow of blood to the lungs during those periods when the average pulmonary blood pressure is excessive.
- the Pulmonary Edema Protector includes two transistors. the emitters of which are connected together and maintained above ground potential by a resistor. Each collector is connected through a resistor to the positive terminal. and the bases are each biased by a resistor to ground.
- the input signal is coupled through a resistor from the Pulmonary Arterial Pressure Sensor" to the base of the first transistor. and the output signal from the collector of the first transistor is coupled by a resistor to the base of the second transistor.
- the signal at the collector of the second transistor of the Pulmonary Edema Protector is coupled through a resistor to the base of the single transistor in the Blood lnlet Switching Network," a circuit similar to the Gas Exhaust Switching Network described above with respect to FIG. 6.
- the opening or closing of the right ventricle blood inlet valve 30 is controlled by the Blood Inlet Switching Network. Such valve is closed in response to any signal from the Pulmonary Edema Protector. which signal is sent only during the brief moments when the pulmonary arterial pressure exceeds the predetermined limit.
- the Pulmonary Edema Protector protects the system so that the lungs are protected from blood circulation rates greater than the lungs can at that moment satisfactorily process. even when the flow of blood back to the heart might suggest a greater circulation rate.
- the inlet valve 30 for the blood for the right ventricle is closed during those moments appropriate for responding to the ability of the lungs to process such rate of blood circulation. but is open much of the time.
- the voltage source is conducted through a zener diode voltage stabilizer to a feedliquid Pump Rate/Duration Control.
- a multivibrator comprising two transistors of opposite conductivity type. The emitter of the first transistor is connected directly to the positive potential. The collector of the second transistor is connected by a resistor to such positive potential. The collector of the first transistor is connected through a resistor. and the emitter of the second tran sistor is connected directly to ground.
- the bases of the two transistors are interconnected by a symmetrical network. each including a base-to-collector resistor and a capacitor and resistor in series between the base of one transistor and the collector of the other.
- the feedliquid Pump Switching Network is essentially of the same configuration and operation as the Gas lnlet Switching Network" of FIG. 6.
- the oscillator of the rate control unit provides a train of pulses of controlled duration which actuate the heavy duty switching of the switching network unit to energize the solenoid 40 to operate the pump 39 at a predetermined constant rate.
- a self-contained implantable artificial heart comprising:
- a reciprocating device said device having a reciprocally movable portion and a stationary portion; artificial left and right artificial ventricles arranged so that when said reciprocally movable portion moves in one direction. said ventricles are simultaneously compressed to expel blood therefrom; electric control circuits comprising sensing means adapted to generate an electrical signal indicative of blood pressure.
- electronic means converting the blood pressure signal to a filtered smoothly varying potential indicative of average blood pressure. said average blood pressure potential being applied si multaneously to a multivibrator to regulate the fre- 2.
- the electrical control means includes sensing means to determine average pulmonary blood pressure.
- an electromagnetic valve at the blood inlet to the right artificial ventricle adapted to control the time when blood may enter said right ventricle said control means being adapted to hold said valve closed when said average pulmonary blood pressure is sensed to be above a predetermined level.
Abstract
Description
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US481578A US3878567A (en) | 1970-12-18 | 1974-06-21 | Self-contained artificial heart |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00099635A US3828371A (en) | 1970-12-18 | 1970-12-18 | Self-contained artificial heart |
US481578A US3878567A (en) | 1970-12-18 | 1974-06-21 | Self-contained artificial heart |
Publications (1)
Publication Number | Publication Date |
---|---|
US3878567A true US3878567A (en) | 1975-04-22 |
Family
ID=26796302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US481578A Expired - Lifetime US3878567A (en) | 1970-12-18 | 1974-06-21 | Self-contained artificial heart |
Country Status (1)
Country | Link |
---|---|
US (1) | US3878567A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4231354A (en) * | 1978-07-14 | 1980-11-04 | Howmedica, Incorporated | Pulsatile blood pumping apparatus and method |
US4427470A (en) | 1981-09-01 | 1984-01-24 | University Of Utah | Vacuum molding technique for manufacturing a ventricular assist device |
US4473423A (en) * | 1982-05-03 | 1984-09-25 | University Of Utah | Artificial heart valve made by vacuum forming technique |
US4493314A (en) * | 1982-06-30 | 1985-01-15 | Lundell Laboratories, Inc. | Heart pump |
US4838889A (en) * | 1981-09-01 | 1989-06-13 | University Of Utah Research Foundation | Ventricular assist device and method of manufacture |
EP0923009A1 (en) * | 1997-12-11 | 1999-06-16 | Colin Corporation | Substitute-heart control apparatus |
US6527698B1 (en) | 2000-05-30 | 2003-03-04 | Abiomed, Inc. | Active left-right flow control in a two chamber cardiac prosthesis |
US6540658B1 (en) | 2000-05-30 | 2003-04-01 | Abiomed, Inc. | Left-right flow control algorithm in a two chamber cardiac prosthesis |
US20040241634A1 (en) * | 2003-06-02 | 2004-12-02 | Organ Recovery Systems | Method and apparatus for pressure control for maintaining viability of organs |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3048165A (en) * | 1959-04-17 | 1962-08-07 | Thompson Ramo Wooldridge Inc | Pump for an artificial heart |
US3379191A (en) * | 1964-04-02 | 1968-04-23 | Thermo Electron Eng Corp | Nuclear powered mechanical heart |
-
1974
- 1974-06-21 US US481578A patent/US3878567A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3048165A (en) * | 1959-04-17 | 1962-08-07 | Thompson Ramo Wooldridge Inc | Pump for an artificial heart |
US3379191A (en) * | 1964-04-02 | 1968-04-23 | Thermo Electron Eng Corp | Nuclear powered mechanical heart |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4231354A (en) * | 1978-07-14 | 1980-11-04 | Howmedica, Incorporated | Pulsatile blood pumping apparatus and method |
US4427470A (en) | 1981-09-01 | 1984-01-24 | University Of Utah | Vacuum molding technique for manufacturing a ventricular assist device |
US4838889A (en) * | 1981-09-01 | 1989-06-13 | University Of Utah Research Foundation | Ventricular assist device and method of manufacture |
US4473423A (en) * | 1982-05-03 | 1984-09-25 | University Of Utah | Artificial heart valve made by vacuum forming technique |
US4493314A (en) * | 1982-06-30 | 1985-01-15 | Lundell Laboratories, Inc. | Heart pump |
EP0923009A1 (en) * | 1997-12-11 | 1999-06-16 | Colin Corporation | Substitute-heart control apparatus |
US5980571A (en) * | 1997-12-11 | 1999-11-09 | Colin Corporation | Substitute-heart control apparatus |
US6527698B1 (en) | 2000-05-30 | 2003-03-04 | Abiomed, Inc. | Active left-right flow control in a two chamber cardiac prosthesis |
US6540658B1 (en) | 2000-05-30 | 2003-04-01 | Abiomed, Inc. | Left-right flow control algorithm in a two chamber cardiac prosthesis |
US20040241634A1 (en) * | 2003-06-02 | 2004-12-02 | Organ Recovery Systems | Method and apparatus for pressure control for maintaining viability of organs |
WO2004110146A1 (en) * | 2003-06-02 | 2004-12-23 | Organ Recovery Systems, Inc. | Method and apparatus for pressure control for maintaining viability of organs |
US7897327B2 (en) | 2003-06-02 | 2011-03-01 | Organ Recovery Systems, Inc. | Method and apparatus for pressure control for maintaining viability of organs |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3919722A (en) | Totally implantable artificial replacement heart | |
US3878567A (en) | Self-contained artificial heart | |
US3379191A (en) | Nuclear powered mechanical heart | |
US3233607A (en) | Automatic heart massage device | |
US4525165A (en) | Fluid handling system for medication infusion system | |
CA1134232A (en) | Implantable infusion apparatus and method | |
US4213207A (en) | Artificial heart and method of pumping blood | |
US3828371A (en) | Self-contained artificial heart | |
US3974825A (en) | Remote electrical monitoring of gas activated blood pumps | |
US3597766A (en) | Artificial heart pumping system powered by a modified stirling cycle engine-compressor having a freely reciprocable displacer piston | |
CA1325499C (en) | Heart assist device | |
US4684368A (en) | Inverted pump | |
CA1233954A (en) | Fully implantable vapor pressure actuated penile erection device and method | |
US3541612A (en) | Fluid actuated and regulated artificial implantable heart system | |
US4144595A (en) | Artificial heart chamber | |
US3604016A (en) | Multiple function blood coupler | |
CA1253048A (en) | Blood pump | |
US3771174A (en) | Artificial heart utilizing blood pulsing fluid oscillators | |
Anzola | Right ventricular contraction | |
EP0272445A2 (en) | A ferromagnetic-fluid pump for pumping biological liquid | |
US3630644A (en) | Fluid pump and actuation thereof | |
US3766568A (en) | Driving device of the stirling-cycle relaxation type for an implantable artificial heart | |
US3534409A (en) | Implantable circulatory support system | |
Altieri | Status of implantable energy systems to actuate and control ventricular assist devices | |
Nolan et al. | In vivo studies of instantaneous blood flow across mitral ball-valve prostheses: effects of cardiac output and heart rate on transvalvular energy loss. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIRST FREEPORT NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC.;AND OTHERS;REEL/FRAME:004303/0077 Effective date: 19840726 Owner name: BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIA Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC.;AND OTHERS;REEL/FRAME:004303/0077 Effective date: 19840726 Owner name: CITIBANK, N.A., AS AGENT Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC.;AND OTHERS;REEL/FRAME:004303/0077 Effective date: 19840726 Owner name: FIRST NATIONAL BANK OF CHICAGO, THE Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC.;AND OTHERS;REEL/FRAME:004303/0077 Effective date: 19840726 Owner name: BRAZOSPORT BANK OF TEXAS Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC.;AND OTHERS;REEL/FRAME:004303/0077 Effective date: 19840726 Owner name: TRUST COMPANY BANK Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC.;AND OTHERS;REEL/FRAME:004303/0077 Effective date: 19840726 Owner name: CHASE MANHATTAN BANK, N.A., THE Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC.;AND OTHERS;REEL/FRAME:004303/0077 Effective date: 19840726 |
|
AS | Assignment |
Owner name: CITIBANK, N.A. Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC., A TX CORP;INTERMEDICS CARDIASSIST, INC., A TX CORP.;INTERMEDICS INTRAOCULAR, INC., A TX CORP.;AND OTHERS;REEL/FRAME:004434/0728 Effective date: 19850703 Owner name: CHASE COMMERCIAL CORPORATION Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC., A CORP. OF TEXAS;INTERMEDICS CARDIASSIST, INC., A CORP OF TX.;INTERMEDICS INTRAOCULAR, INC., A CORP. OF TEXAS;AND OTHERS;REEL/FRAME:004449/0501 Effective date: 19850703 Owner name: B.A. LEASING CORPORATION Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC., A CORP. OF TEXAS;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC., A CORP. OF TEXAS;AND OTHERS;REEL/FRAME:004449/0424 Effective date: 19850703 Owner name: CITICORP MILTILEASE (SEF), INC. Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.;INTERMEDICS CARDIASSIST, INC.;INTERMEDICS INTRAOCULAR, INC., A CORP. OF TEXAS;AND OTHERS;REEL/FRAME:004452/0900 Effective date: 19850703 |
|
AS | Assignment |
Owner name: INTERMEDICS, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITICORP MULTILEASE (SEF), INC.;REEL/FRAME:004576/0516 Effective date: 19860515 Owner name: INTERMEDICS, INC., INTERMEDICS CARDIASSIST, INC., Free format text: SECURED PARTY HEREBY RELEASE THE SECURITY INTEREST IN AGREEMENT RECORDED AUGUST 5, 1985. REEL 4434 FRAMES 728-782;ASSIGNOR:CITIBANK, N.A.;REEL/FRAME:004592/0394 Effective date: 19860502 Owner name: INTERMEDICS, INC., INTERMEDICS CARDIASSIST, INC., Free format text: SAID PARTIES RECITES OBLIGATIONS RECITED IN SECURITY AGREEMENT RECORDED SEPTEMBER 17, 1984 REEL 4303 FRAMES 077-127 HAVE BEEN PAID IN FULL ALL;ASSIGNOR:CITIBANK, N.A., INDIVIDUALLY AND AS AGENT FOR BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION, THE CHASE MANHATTAN BANK, N.A., THE FIRST NATIONAL BANK OF CHICAGO, TRUST COMPANY BANK, FIRST FREEPORT NATIONAL BANK OF BRAZOSPORT BANK OF TEXAS;REEL/FRAME:004592/0424 Effective date: 19860502 |
|
AS | Assignment |
Owner name: MAY PARTNERSHIP THE, 2170 PIEDMONT ROAD, N.E., ATL Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.,;INTERMEDICS CARDIASSIST, INC.;SURGITRONICS CORPORATION;AND OTHERS;REEL/FRAME:004581/0501 Effective date: 19860703 Owner name: MAY PARTNERSHIP, THE,GEORGIA Free format text: SECURITY INTEREST;ASSIGNORS:INTERMEDICS, INC.,;INTERMEDICS CARDIASSIST, INC.;SURGITRONICS CORPORATION;AND OTHERS;REEL/FRAME:004581/0501 Effective date: 19860703 |
|
AS | Assignment |
Owner name: INTERMEDICS, INC., A TEXAS CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: INTERMEDICS CARDIASSIST, INC., A TEXAS CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: INTERMEDICS INTRAOCULAR, INC., A TEXAS CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: SURGITRONICS CORPORATION, A TEXAS CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: CARBOMEDICS, INC., A TEXAS CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: NEUROMEDICS, INC., A TEXAS CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: CALCITEK, INC., A TEXAS CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: AMERICAN PACEMAKER CORPORATION, A MASSACHUSETTS CO Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: INTERMEDICS, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE COMMERCIAL CORPORATION;REEL/FRAME:004605/0581 Effective date: 19860804 Owner name: INTERMEDICS CARDIASSIST, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE COMMERCIAL CORPORATION;REEL/FRAME:004605/0581 Effective date: 19860804 Owner name: INTERMEDICS INTRAOCULAR, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE COMMERCIAL CORPORATION;REEL/FRAME:004605/0581 Effective date: 19860804 Owner name: SURGITRONICS CORPORATION Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE COMMERCIAL CORPORATION;REEL/FRAME:004605/0581 Effective date: 19860804 Owner name: CARBO-MEDICS, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE COMMERCIAL CORPORATION;REEL/FRAME:004605/0581 Effective date: 19860804 Owner name: NEUROMEDICS, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE COMMERCIAL CORPORATION;REEL/FRAME:004605/0581 Effective date: 19860804 Owner name: CALCITEK, INC., ALL TEXAS CORPS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE COMMERCIAL CORPORATION;REEL/FRAME:004605/0581 Effective date: 19860804 Owner name: AMERICAN PACEMAKER CORPORATION A CORP OF MA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE COMMERCIAL CORPORATION;REEL/FRAME:004605/0581 Effective date: 19860804 Owner name: INTERMEDICS, INC., A TEXAS CORP., STATELESS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: INTERMEDICS CARDIASSIST, INC., A TEXAS CORP., STAT Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: INTERMEDICS INTRAOCULAR, INC., A TEXAS CORP., STAT Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: SURGITRONICS CORPORATION, A TEXAS CORP., STATELESS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: CARBOMEDICS, INC., A TEXAS CORP., STATELESS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: NEUROMEDICS, INC., A TEXAS CORP., STATELESS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 Owner name: CALCITEK, INC., A TEXAS CORP., STATELESS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607 Effective date: 19860813 |
|
AS | Assignment |
Owner name: INTERMEDICS, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MAY PARTNERSHIP, THE, BY: ROLLINS HOLDING COMPANY, INC.;REEL/FRAME:004874/0945 Effective date: 19870112 |