Medical pumping apparatus

• US 5,396,896 A
• Filed: 05/15/1991
• Issued: 03/14/1995
• Est. Priority Date: 05/15/1991
• Status: Expired due to Term

• Current Assignee: Chrono Dynamics, Ltd., Covidien AG (Medtronic Plc)
• Original Assignee: Chrono Dynamics, Ltd.
• Inventors: McQain, David B., Tumey, David M., Reeves, William H., Reeves, Jonathon W., Aboujaoude, Abdou F.
• Primary Examiner(s): Hafer, Robert A.
• Assistant Examiner(s): HANLON, BRIAN EMMETT
• Application Number:
  US07/700,500
• Time in Patent Office: 1,399 Days
• Field of Search: 128/690, 128/680, 128/64, 128/630, 128/671, 128/38-40, 128/64, 128/637, 128/670, 128/672, 128/691, 128/694
• US Class Current: 600/503
• CPC Class Codes: A61H 2201/501 connected to external computer devices or networks
• CPC Class Codes: A61H 2205/12 Feet
• CPC Class Codes: A61H 2230/25 Blood flowrate, e.g. by Doppler effect
• CPC Class Codes: A61H 2230/65 Impedance, e.g. skin conductivity; capacitance, e.g. galvanic skin response [GSR]
• CPC Class Codes: A61H 9/0078 with intermittent or alternately inflated bladders or cuffs mattresses for preventing bed-sores with alternated pressurized chambers A61G7/05776
• CPC Class Codes: Y10S 128/925 Neural network

Abstract

This invention relates to a medical pumping apparatus which utilizes a neural network. The medical pumping apparatus continuously and automatically monitors fill status of the venous plexus and flow rate from the venous plexus and continuously and automatically controls the pressure and cycle rate of a pump capable of cyclically applying pressure to a part of the human body for the purpose of maximizing blood transfer therein.

Claims

1. A medical pumping apparatus, comprising:

means for applying pressure to a body part;

means for sensing blood fill status in the body part and generating a blood fill status signal in response thereto;

means for receiving and manipulating said blood fill status signal to produce an output signal, wherein said receiving and manipulating means includes neural network means for producing a generalization about said blood fill status signal, said generalization used to form said output signal, and wherein said neural network means includes a predetermined solution space memory indicative of needing to increase pressure, a predetermined solution space memory indicative of needing to decrease pressure, and a predetermined solution space indicative of needing to maintain pressure, and wherein said neural network means performs said generalization by projecting said blood fill status signal into one of said solution space memory; and

means operatively associated with said receiving and manipulating means for controlling said pressure means in accordance with said output signal.

2. The apparatus of claim 1, which further includes means operatively connected to said receiving and manipulating means for sensing blood flow rate in the body part and generating a blood flow rate signal in response thereto to allow said neural network means to produce a generalization about said blood flow rate signal, and wherein said generalizations of said blood fill status and said blood flow rate signal are used to form said output signal.

3. The apparatus of claim 1, wherein said sensing means includes impedance sensing means for sensing impedance across the body part.

4. The apparatus of claim 1, wherein said sensing means further includes light reflective rheology sensing means for sensing blood flow across the body part.

5. The apparatus of claim 1, wherein said neural network comprises:

an input layer having a plurality of neuron-like units, wherein each neuron-like unit includes a receiving channel for receiving said blood fill status signal, wherein said receiving channel includes predetermined means for modulating said blood fill status signal;

a hidden layer having a plurality of neuron-like units individually receptively connected to each of said units of said input layer, wherein each connection includes predetermined means for modulating each connection between said input layer and said hidden layer; and

an output layer having a plurality of neuron-like units individually receptively connected to each of said units of said hidden layer, wherein each connection includes predetermined means for modulating each connection between said hidden layer and said output layer, and wherein each unit of said output layer includes an outgoing channel for projecting the modulated blood fill status signal into at least one of said solution space memory.

6. The apparatus of claim 5, which further includes means operatively connected to said neural network for displaying said modulated signal.

7. The apparatus of claim 1, wherein said control means includes a control circuit responsive to said neural network and which controls pressure and cycle rate of said pressure means.

8. The apparatus of claim 7, wherein said control circuit controls said pressure means to synchronize the application of pressure and cycle rate with the maximum blood fill status.

9. The apparatus of claim 1, wherein said pressure application means includes:

an inflatable boot having an inflatable bladder shaped to conform to a human foot, a plate connected to said bladder and adapted to longitudinally extend along the sole of the foot, a surface conformable member disposed on said plate and between said plate and the sole of the foot, valve means integrally formed with said bladder through which a pneumatic pressure passes, and means for securing the bladder to the foot; and

a pumping apparatus operatively connected to said boot, wherein said pumping apparatus is operatively connected to said control means and which delivers said pneumatic pressure to said boot.

10. The apparatus of claim 9, wherein said boot is connected to said sensing means such that said sensing means are disposed adjacent to the dorsum and the sole of the foot.

11. The apparatus of claim 9, wherein said boot is connected to said sensing means such that said sensing means are disposed adjacent to the heel and the sole of the foot.

12. A medical pumping apparatus, comprising:

means for applying pressure to a body part;

means for sensing blood fill status in the body part and generating a blood fill status signal in response thereto;

means for receiving and manipulating said blood fill status signal to produce an output signal, wherein said receiving and manipulating means includes neural network means for producing a generalization about said blood fill status signal, said generalization used to form said output signal, and wherein said neural network means includes a predetermined solution space memory indicative of needing to increase pressure application rate, a predetermined solution space memory indicative of needing to decrease pressure application rate, and a predetermined solution space indicative of needing to maintain pressure application rate, and wherein said neural network means performs said generalization by projecting said blood fill status signal into one of said solution space memory; and

means operatively associated with said receiving and manipulating means for controlling said pressure means in accordance with said output signal.

13. The apparatus of claim 12, wherein said sensing means includes impedance sensing means for sensing impedance across the body part.

14. The apparatus of claim 12, wherein said sensing means includes light reflective rheology sensing means for sensing blood flow across the body part.

15. The apparatus of claim 12, wherein said neural network comprises:

an input layer having a plurality of neuron-like units, wherein each neuron-like unit includes a receiving channel for receiving said blood fill status signal, wherein said receiving channel includes predetermined means for modulating said blood fill status signal;

a hidden layer having a plurality of neuron-like units individually receptively connected to each of said units of said input layer, wherein each connection includes predetermined means for modulating each connection between said input layer and said hidden layer; and

an output layer having a plurality of neuron-like units individually receptively connected to each of said units of said hidden layer, wherein each connection includes predetermined means for modulating each connection between said hidden layer and said output layer, and wherein each unit of said output layer includes an outgoing channel for projecting the modulated blood fill status signal into at least one of said solution space memory.

16. The apparatus of claim 15, which further includes means operatively connected to said neural network for displaying said modulated signal.

17. The apparatus of claim 12, wherein said control means includes a control circuit responsive to said neural network and which controls pressure and cycle rate of said pressure means.

18. The apparatus of claim 17, wherein said control circuit controls said pressure means to synchronize the application of pressure and cycle rate with the maximum blood fill status.

19. The apparatus of claim 12, wherein said pressure application means includes:

an inflatable boot having an inflatable bladder shaped to conform to a human foot, a plate connected to said bladder and adapted to longitudinally extend along the sole of the foot, a surface conformable member disposed on said plate and between said plate and the sole of the foot, valve means integrally formed with said bladder through which a pneumatic pressure passes, and means for securing the bladder to the foot; and

a pumping apparatus operatively connected to said boot, wherein said pumping apparatus is operatively connected to said control means and which delivers said pneumatic pressure to said boot.

20. The apparatus of claim 19, wherein said boot is connected to said sensing means such that said sensing means are disposed adjacent to the dorsum and the sole of the foot.

21. The apparatus of claim 19, wherein said boot is connected to said sensing means such that said sensing means are disposed adjacent to the heel and the sole of the foot.

22. The apparatus of claim 12, which further includes means operatively connected to said receiving and manipulating means for sensing blood flow rate in the body part and generating a blood flow rate signal in response thereto to allow said neural network means to produce a generalization about said blood flow rate signal, and wherein said generalizations of said blood fill status and said blood flow rate signal are used to form said output signal.

23. A medical pumping apparatus, comprising:

means for applying pressure to a body part;

means for sensing blood fill status in the body part and generating a blood fill status signal in response thereto;

means for receiving and manipulating said blood fill status signal to produce an output signal, wherein said receiving and manipulating means includes neural network means for producing a generalization about said blood fill status signal, said generalization used to form said output signal, and wherein said neural network means includes a predetermined solution space memory indicative of normal physiological conditions and a predetermined solution space indicative of abnormal physiological conditions, and wherein said neural network means performs said generalization by projecting said blood fill status signal into one of said solution space memory; and

means operatively associated with said receiving and manipulating means for controlling said pressure means in accordance with said output signal.

24. The apparatus of claim 23, wherein said abnormal physiological solution space is indicative of deep vein thrombosis.

25. The apparatus of claim 23, wherein said abnormal physiological solution space is indicative of ischemia.

26. The apparatus of claim 23, wherein said abnormal physiological solution space is indicative of venous insufficiency.

27. The apparatus of claim 23, wherein said sensing means includes impedance sensing means for sensing impedance across the body part.

28. The apparatus of claim 23, wherein said sensing means includes light reflective rheology sensing means for sending blood flow across the body part.

29. The apparatus of claim 23, wherein said neural network comprises:

an input layer having a plurality of neuron-like units, wherein each neuron-like unit includes a receiving channel for receiving said blood fill status signal, wherein said receiving channel includes predetermined means for modulating said blood fill status signal;

a hidden layer having a plurality of neuron-like units individually receptively connected to each of said units of said input layer, wherein each connection includes predetermined means for modulating each connection between said input layer and said hidden layer; and

an output layer having a plurality of neuron-like units individually receptively connected to each of said units of said hidden layer, wherein each connection includes predetermined means for modulating each connection between said hidden layer and said output layer, and wherein each unit of said output layer includes an outgoing channel for projecting the modulated blood fill status signal into at least one of said solution space memory.

30. The apparatus of claim 29, which further includes means operatively connected to said neural network for displaying said modulated signal.

31. The apparatus of claim 23, wherein said control means includes a control circuit responsive to said neural network and which controls pressure and cycle rate of said pressure means.

32. The apparatus of claim 31, wherein said control circuit controls said pressure means to synchronize the application of pressure and cycle rate with the maximum blood fill status.

33. The apparatus of claim 23, wherein said pressure application means includes:

an inflatable boot having an inflatable bladder shaped to conform to a human foot, a plate connected to said bladder and adapted to longitudinally extend along the sole of the foot, a surface conformable member disposed on said plate and between said plate and the sole of the foot, valve means integrally formed with said bladder through which a pneumatic pressure passes, and means for securing the bladder to the foot; and

a pumping apparatus operatively connected to said boot, wherein said pumping apparatus is operatively connected to said control means and which delivers said pneumatic pressure to said boot.

34. The apparatus of claim 33, wherein said boot is connected to said sensing means such that said sensing means are disposed adjacent to the dorsum and the sole of the foot.

35. The apparatus of claim 34, wherein said boot is connected to said sensing means such that said sensing means are disposed adjacent to the heel and the sole of the foot.

36. The apparatus of claim 23, which further includes means operatively connected to said receiving and manipulating means for sensing blood flow rate in the body part and generating a blood flow rate signal in response thereto to allow said neural network means to produce a generalization about said blood flow rate signal, and wherein said generalizations of said blood fill status and said blood flow rate signal are used to form said output signal.