Measurement of pain

• US 6,146,334 A
• Filed: 09/21/1998
• Issued: 11/14/2000
• Est. Priority Date: 01/02/1996
• Status: Expired due to Fees

• Current Assignee: Cefar Matcher AB
• Original Assignee: Kay Laserow
• Inventors: Laserow, Kay
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): SZMAL, BRIAN SCOTT
• Application Number:
  US09/091,817
• Time in Patent Office: 785 Days
• Field of Search: 600/552, 600/554, 600/557, 128/630, 128/744, 128/742, 128/741
• US Class Current: 600/552
• CPC Class Codes: A61B 5/4824 Touch or pain perception evaluation A61B5/4821 takes precedence

Abstract

A measuring instrument for the measurement of an existing pain or a feeling of nausea of a patient. The measuring instrument induces pain in an arbitrary body part of said patient, by supplying an electrical current. The measuring instrument provides a current increase into said body part, until said induced pain is experienced by the patient as being as great as the existing pain/nausea. The current is supplied from a current source arranged in the measuring instrument via wires and electrodes, said electrodes being applied onto that part of the body in which pain is to be induced. When the pain induced is experienced to be as great as the existing pain/nausea, the body part is removed from the electrodes, whereupon a pain value is registered and shown on a display.

Claims

1. An apparatus for assessing a level of an arbitrary first sensation, experienced by a person, the first sensation being compared to an induced physical sensation, the apparatus comprising:

a stimulator configured to supply a physical stimulus of an electrical current to said person and to thereby induce a physical sensation in said person;

an activator mechanism configured to activate an increasing supply of said physical stimulus;

a deactivator mechanism actuateable by said person and configured to deactivate the supply of said physical stimulus;

an increase stop switch configured to halt the automatic stimulus increase;

a stimulation level control device configured to provide an automatic increase in said physical stimulus dependent on said activator mechanism, to maintain the physical stimulus at a constant level dependent on a first actuation of the increase stop switch, and to resume said automatic physical stimulus increase dependent on a second actuation of said increase stop switch; and

a registration device configured to register a sensation level value dependent on the supplied physical stimulus and corresponding to said first experienced sensation in response to a deactivation by said person of said supply of the physical stimulus when the induced physical sensation is perceived to be comparable to the first experienced sensation.

2. An apparatus as recited in claim 1, wherein the stimulator includes an electrical current source and electrodes connected by wiring, said electrodes being applicable to a body part of said person and configured to deliver said physical stimulus of an electrical current to said person.

3. An apparatus as recited in claim 1, further comprising memory circuits configured to register said sensation level.

4. An apparatus as recited in claim 3, wherein said memory circuits further register said sensation level value with date and time data.

5. An apparatus as recited in claim 1, further comprising:

a display configured to display a registered sensation level value; and

a value switch configured to activate a presentation of said sensation level value on said display.

6. An apparatus as recited in claim 1, further comprising an interface configured to enable transferring said sensation level value to a computer for analysis and processing.

7. An apparatus as recited in claim 2, wherein:

said activator mechanism and deactivator mechanism are further configured such that the delivery of an increasing electrical current is activated in response to the electrodes being connected in a closed electrical circuit when in contact with the body part of the person and deactivated when the closed circuit is interrupted due to the electrodes being removed from the body part on the motion of the person;

the registration device is further configured such that a sensation level value dependent on the level of the electrical current is registered by the registration device in response to said interruption of the circuit.

8. An apparatus as recited in claim 2, further comprising a support structure for said electrodes, the electrodes being positioned on opposite sides of said support structure such that the electrodes are capable of being grasped between fingers of said person.

9. An apparatus as recited in claim 8, wherein the support structure is portable, elongate, and configured such that the force between the fingers grasping the electrodes required to maintain said support structure in a horizontal position corresponds to a predetermined minimum pressure.

10. An apparatus as recited in claim 2, further comprising a support structure for said electrodes, the electrodes being positioned adjacent each other on one side of said support structure such that the electrodes are capable of being applied to an arbitrary part of the body part of said person.

11. An apparatus as recited in claim 2, further comprising a resilient contact means provided between said electrodes and said wiring such that a predetermined pressure against said electrodes is required to establish electrical contact for delivering the electrical current to said electrodes.

12. An apparatus as recited in claim 2, wherein the stimulation level control device controls the electrical current to increase automatically in response to the electrodes being short-circuited.

13. An apparatus as recited in claim 1, further comprising an electrical current source of battery means and means for upwards voltage transformation.

14. An apparatus as recited in claim 1, further comprising a microprocessor configured to control components of said apparatus.

15. An apparatus as recited in claim 2, wherein the stimulation level control device increases the electrical current in predetermined fashion increasing in steps of 50 A in one of a linear and exponential manner.

16. An apparatus as recited in claim 1, wherein said registration device registers said sensation level value on a scale ranging from one of 0-10, 0-60, and 0-99.

17. An apparatus as recited in claim 1, further comprising a system to signal a time for performing an assessment sequence.

18. An apparatus as recited in claim 1, wherein the sensation to be assessed is one of pain and nausea.

19. An apparatus as recited in claim 1, wherein the induced physical sensation is pain.

20. A method for assessing a level of an arbitrary first sensation experienced by a person, the first sensation being compared to an induced physical sensation, comprising the steps of:

supplying a physical stimulus to said person to thereby induce a physical sensation in said person;

increasing said physical stimulus;

comparing, by said person, the induced physical sensation to a first experienced sensation;

halting, by said person, the increase of said physical stimulus and maintaining the physical stimulus at a constant level;

resuming the increase of said physical stimulation if the induced physical sensation is not perceived to be comparable to the first sensation;

deactivating, by said person, said supply of said physical stimulus if the induced physical sensation is perceived to be comparable to the first experienced sensation; and

registering a sensation level value dependent on the supplied physical stimulus and corresponding to said first experienced sensation in response to the deactivation by said person of said supply of the physical stimulus.

21. A method as recited in claim 20, wherein the physical stimulus is an electrical current.

22. A method as recited in claim 21, further comprising the step of delivering the electrical current to said person through electrodes being applied to a body part of said person.

23. A method as recited in claim 20, further comprising the step of registering said sensation level value in memory circuits with date and time data.

24. A method as recited in claim 20, further comprising the step of displaying a registered sensation level value in response to actuation of a value switch.

25. A method as recited in claim 20, further comprising the step of transferring said sensation level value to a computer for analysis and processing.

26. A method as recited in claim 22, further comprising the steps of:

delivering an increasing electrical current and thereby inducing an increasing physical sensation in response to the electrodes being in contact with the body part of the person and thus forming a closed circuit;

removing the electrodes from the body part of the person and thereby interrupting the circuit, on the motion of the person, when the induced physical sensation is perceived to be comparable to the first experienced sensation; and

registering said sensation level value in response to the interruption of the circuit.

27. A method as recited in claim 22, further comprising the step of providing electrodes on opposite sides of a support structure such that the electrodes are capable of being grasped between fingers of said person.

28. A method as recited in claim 27, wherein the support structure is portable, elongate, and configured such that the force between the fingers grasping the electrodes required to maintain said support structure in a horizontal position corresponds to a predetermined minimum pressure.

29. A method as recited in claim 22, further comprising the steps of providing electrodes adjacent each other on one side of a support structure such that the electrodes are capable of being applied to an arbitrary part of the body part of said person.

30. A method as recited in claim 22, further comprising the step of providing resilient contact means between said electrodes and wiring connecting the electrodes to a current supply such that a predetermined pressure against said electrodes is required to establish the electrical contact for delivering electrical current to said electrodes.

31. A method as recited in claim 22, further comprising the step of increasing the electrical current automatically starting in response to the electrodes being short-circuited.

32. A method as recited in claim 21, further comprising the step of providing the electrical current from an electrical current source of battery means and means for upwards voltage transformation.

33. A method as recited in claim 20, further comprising the step of controlling the supply of the physical stimulus, the activation of the physical stimulus, the deactivation of the physical stimulus, and the registering of a sensation level by means of a microprocessor.

34. A method as recited in claim 20, wherein the sensation to be assessed is one of pain and nausea.

35. A method as recited in claim 20, wherein the induced physical sensation is pain.

36. A method as recited in claim 21, further comprising the step of increasing the electrical current in a predetermined fashion in steps of 50 A in one of a linear and exponential manner.

37. A method as recited in claim 20, further comprising the step of registering said sensation level value on a scale ranging from one of 0-10, 0-60, and 0-99.

38. A method as recited in claim 20, wherein a first experienced sensation in one of a pair of body parts is compared to an induced physical sensation in the other part of said pair.

39. A method for assessing a level of an arbitrary first sensation experienced by a person, comprising the steps of:

using a stimulator for supplying a physical stimulation of an electrical current, said stimulator having an electrical current source, electrodes connected to the electrical current source positioned on opposite sides of a support structure, an actuating mechanism for activating or deactivating the supply of said electrical current dependent on a current flowing through said electrodes, an electrical level control device adapted to provide an increase in said electrical current, to maintain the electrical current at a constant level in response to a first actuation of an increase stop switch and to resume the increase in response to a second actuation of said increase stop switch, a registration device for registering a sensation level value dependent on the supplied electrical current when deactivated, and a display configured to display a registered sensation level value;

activating, by said person, the supply of said electrical current by grasping the electrodes and thereby closing an electrical circuit between the electrodes;

supplying the electrical current to said person and thereby inducing a physical sensation in said person;

increasing said electrical current thereby increasing the induced physical sensation;

comparing, by said person, the induced physical sensation to said first experienced sensation;

halting, by said person, the increase of said electrical current and maintaining said electrical current at a constant level;

resuming the increase of said physical stimulus, if the induced physical sensation is not perceived to be comparable to the first experienced sensation;

deactivating, by said person, the supply of said electrical current by releasing the electrodes and thereby interrupting said electrical circuit, if the induced physical sensation is perceived by said person to be comparable to the first experienced sensation; and

registering a sensation level value dependent on the supplied electrical current and corresponding to said first experienced sensation in response to the deactivation of the supply of said electrical current, the registered sensation level value thereby also being dependent on the first experienced sensation.

40. A method as recited in claim 39, further comprising the steps of:

increasing the current automatically starting when said electrical circuit is closed.

41. A method as recited in claim 39, further comprising the step of:

storing the registered sensation level value in memory circuits;

repeating the steps from using to registering during an arbitrary period of time and storing each sensation level value; and

transferring the stored sensation level values to a computer for analysis and processing.