Patent US4763666A successfully refreshed from Google Patents.
US4763666A
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Method and apparatus for determining the thermal sensitivity of the human peripheral nervous system
Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
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Filing: 1986-04-22
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Granted: 1988-08-16
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Expires: 2006-04-22
Abstract
Abstract To determine the heat or cold sensation or pain threshold of a human being, thermode is applied to the skin of the subject under investigation, and the temperature is varied until the subject feels pain. This pain threshold temperature is maintained for a predetermined period of time and then the subject is requested to adjust the temperature until the same sensation is felt. The pain threshold temperature values obtained by this "tonic" method may be verified or improved by a "phasic" method of applying thermal stimuli, wherein pulse-type thermal stimuli are applied with randomly varying spacings and with temperatures which vary randomly about the pain threshold temperature established by the tonic method.
Inventors
- 👤 Friedrich Strian
- 👤 Rupert Hoelzl
- 👤 Gunther Galfe
- 👤 Stefan Lauterbacher
- 👤 Wilhelm Lehmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:01
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/48; A61B5/4824; A61B5/4827; A61B5/483
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
152 words
An apparatus for testing the temperature sensitivity of a portion of the skin of a subject, said apparatus comprising: applicator means (30) having a contact surface (32) for directly applying, when energized, a thermal stimulus of controlled temperature to said skin portion; energizing means (38) connected to said applicator means for energizing said applicator means; controlling means (46, 52) connected to said energizing means for controlling said energizing means to establish a predetermined temperature of said contact surface of said applicator means; actuating means (71) for supplying an actuator signal; and maintaining means (76, 102) connected to said controlling means and being responsive to said actuating signal for maintaining essentially constant the temperature of said contact surface of said applicator means at a temperature value established by said controlling means at the time of actuation of said actuating means for a predetermined period of time after actuation of said actuating means (71).
Claim 2
Independent Claim
152 words
An apparatus for testing the temperature sensitivity of a portion of the skin of a subject, said apparatus comprising: applicator means (30) having a contact surface (32) for directly applying, when energized, a thermal stimulus of controlled temperature to said skin portion; energizing means (38) connected to said applicator means for energizing said applicator means; controlling means (46, 52) connected to said energizing means for controlling said energizing means to establish a predetermined temperature of said contact surface of said applicator means; actuating means (71) for supplying an actuator signal; and maintaining means (76, 102) connected to said controlling means and being responsive to said actuating signal for maintaining essentially constant the temperature of said contact surface of said applicator means at a temperature value established by said controlling means at the time of actuation of said actuating means for a predetermined period of time after actuation of said actuating means (71).
Claim 3
Dependent Claim
126 words
The apparatus as claimed in claim 1, wherein: said applicator means comprises a Peltier element for producing said thermal stimulus; said energizing means comprises a controllable current source for energizing said Peltier element with a current of a level established by a temperature reference signal, said current source being responsive to said reference temperature signal and an actual temperature signal; said controlling means comprises a manually adjustable reference signal source for providing said temperature reference signal to said current source; said actuating means comprises a manually actuatable actuator element; and said maintaining means comprises a sample-and-hold circuit (76) and a timer (102) for storing said temperature reference signal and maintaining it for said predetermined period of time in response to the actuation of said actuator element.
Claim 4
Dependent Claim
26 words
The apparatus as claimed in claim 2, further comprising signaling means connected to said maintaining means (90) for signalling the expiration of said period of time.
Claim 5
Dependent Claim
36 words
The apparatus as claimed in claim 2, further comprising a temperature sensor fixed to said contact surface and an electrically insulating layer between said surface and said sensor, said temperature sensor providing said actual temperature signal.
Claim 6
Dependent Claim
18 words
The apparatus as claimed in claim 1, wherein said contact surface is provided with an electrically insulating coating.
Claim 7
Independent Claim
140 words
An apparatus for testing the temperature sensitivity of a portion of the skin of a subject, said apparatus comprising: applicator means (30) having a contact surface (32) for applying a thermal stimulus of controlled temperature to said skin portion; energizing means (38) connected to said applicator means for energizing said applicator means; and controlling means (56) connected to said energizing means for controlling said energizing means to cause said applicator means to produce a series of timely spaced thermal stimuli each having a predetermined duration and a predetermined temperature, and the temperatures of said stimuli having values between a lower and an upper temperature limit; varying means connected to said energizing means for varying each of said limits; and recording means connected to said applicator means for recording said temperature values and a response of said subject to selected stimuli.
Claim 8
Independent Claim
140 words
An apparatus for testing the temperature sensitivity of a portion of the skin of a subject, said apparatus comprising: applicator means (30) having a contact surface (32) for applying a thermal stimulus of controlled temperature to said skin portion; energizing means (38) connected to said applicator means for energizing said applicator means; and controlling means (56) connected to said energizing means for controlling said energizing means to cause said applicator means to produce a series of timely spaced thermal stimuli each having a predetermined duration and a predetermined temperature, and the temperatures of said stimuli having values between a lower and an upper temperature limit; varying means connected to said energizing means for varying each of said limits; and recording means connected to said applicator means for recording said temperature values and a response of said subject to selected stimuli.
Claim 9
Dependent Claim
18 words
The apparatus as claimed in claim 6, comprising signalling means to signal the application of a thermal stimulus.
Claim 10
Dependent Claim
18 words
The apparatus as claimed in claim 6, wherein said contact surface is provided with an electrically insulating coating.
Claim 11
Dependent Claim
18 words
The apparatus as claimed in claim 6, wherein said temperature values are essentially randomly distributed between said limits.
Claim 12
Dependent Claim
20 words
The apparatus as claimed in claim 6, wherein the time spacings of said stimuli vary in an essentially random manner.
Claim 13
Dependent Claim
33 words
The apparatus as claimed in claim 6, wherein said lower and upper limits are set below and above a preestablished level, respectively, at which said subject under investigation regards said stimulus as painful.
Claim 14
Dependent Claim
41 words
The apparatus as claimed in claim 6, further comprising actuating means actuated by a subject under investigation for signalling the subject's response to the thermal stimulus and wherein said recording means (100) records the times of actuation of said actuating means.
Claim 15
Dependent Claim
37 words
The apparatus as claimed in claim 6, further comprising response means (101), connected to said recording means, for deriving a physical response of the subject under investigation to the application of a thermal stimulus from said subject.
Claim 16
Dependent Claim
30 words
The apparatus as claimed in claim 6, comprising means for actively returning the temperature of said applicator means to a reference temperature level at the end of a thermal stimulus.
Claim 17
Independent Claim
47 words
A method of establishing the sensitivity of a subject for thermal stimuli, said method comprising: establishing predetermined upper and lower temperature limits; and applying thermal stimuli to a skin portion of said subject, said stimuli having temperatures which vary in an essentially random manner between said limits.
Claim 18
Independent Claim
47 words
A method of establishing the sensitivity of a subject for thermal stimuli, said method comprising: establishing predetermined upper and lower temperature limits; and applying thermal stimuli to a skin portion of said subject, said stimuli having temperatures which vary in an essentially random manner between said limits.
Claim 19
Dependent Claim
17 words
The method of claim 15, wherein said applying step includes applying said stimuli with varying time spacings.
References Cited (Backward Citations)
US3533397A
Cited
US3942515A
Cited
DE2609415A1
Cited
DE2753109A1
Cited
US4573472A
Cited
US4653507A
Cited
US4585002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |