US3794017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic velocity component selector for electronystagmographs
Assignee: Individual
•
Filing: 1971-01-08
•
Granted: 1974-02-26
•
Expires: 1991-01-08
Abstract
Abstract An improved apparatus for recording the velocity components in electronystagmographs. The eye position signals obtained from sensors attached to a patient undergoing nystagmus tests are coupled to a differentiator. The output of the differentiator is attached, through switch means, to a pen actuated recorder to provide an analog recording of the velocity derivative under desired test conditions. Means are provided to readily set the pen to zero at a mid-graph location, at a top-graph location and at a bottom-graph location thereby enabling the positive and negative velocity components to be shown on the entire graph scale.
Inventors
- 👤 G Servos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:47
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/48; A61B5/4863; A61B5/24; A61B5/316; A61B5/398; A61B5/72; A61B5/7235; A61B5/7239
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
An improved apparatus for automatically measuring the eyeball velocity characteristics of a patient under conditions of nystagmus by applying distinct hot And cold temperature differentials to the tympanic membranes of the patient for diagnosing vestibular disorders, said apparatus comprising selecting means for inducing mystagmus in a patient by applying distinct ones of said hot and cold temperature differentials in a sequential manner, means for sensing the cornea-retina voltages indicative of the movement of the patient''s eyes across the eye sockets, amplifying means for amplifying said voltages, velocity converting means for automatically converting said voltages to velocity indications, said velocity converting means comprising differentiating means for differentiating said voltages, and said selecting means also simultaneously coupling, the output of said differentiating means to indicating means, said selecting means further comprising means for coupling only the slow velocity components of each of said velocity indications to said indicating means under the distinct ones of said hot or cold differentials.
Claim 2
Dependent Claim
157 words
An improved apparatus for automatically measuring the eyeball velocity characteristics of a patient under conditions of nystagmus by applying distinct hot And cold temperature differentials to the tympanic membranes of the patient for diagnosing vestibular disorders, said apparatus comprising selecting means for inducing mystagmus in a patient by applying distinct ones of said hot and cold temperature differentials in a sequential manner, means for sensing the cornea-retina voltages indicative of the movement of the patient''s eyes across the eye sockets, amplifying means for amplifying said voltages, velocity converting means for automatically converting said voltages to velocity indications, said velocity converting means comprising differentiating means for differentiating said voltages, and said selecting means also simultaneously coupling, the output of said differentiating means to indicating means, said selecting means further comprising means for coupling only the slow velocity components of each of said velocity indications to said indicating means under the distinct ones of said hot or cold differentials.
Claim 3
Dependent Claim
44 words
The improved apparatus of claim 1 wherein differentiating means comprises operational amplifier means, parallel resistor-capacitor network means for interconnecting the input and the output of said operational amplifier, and series resistor-capacitor network means for coupling said voltages to the input of said operational amplifier.
Claim 4
Dependent Claim
82 words
The improved apparatus of claim 1 wherein said indicating means comprises recording means, said recording means comprising a movable media for recording indications thereon, pen means for making indications on said media, motor means for moving said pen means transverse to the movement of said media as a function of the output of said differentiating means, and said selecting means comprising switching means for coupling the output of said differentiating means of said motor means at each of said variety of conditions.
Claim 5
Dependent Claim
34 words
The apparatus of claim 3 wherein said means for coupling only said slow velocity component to said pen motor means comprises diode means coupled between said selecting means and the output of said differentiator.
Claim 6
Dependent Claim
96 words
The apparatus of claim 4 wherein said diode means comprises a first diode to pass positive signals and block negative signals, said selecting means having switching positions including left cold, right cold, left hot, right hot and both positions in accordance with the said variety of conditions, said first diode coupled between the output of said differentiator and the right cold and left hot positions of said switch when the left tympanic membrane of the patient is exposed to the hot temperature and the right tympanic membrane of the patient is exposed to the cold temperature.
Claim 7
Dependent Claim
79 words
The apparatus of claim 5 wherein said means for coupling only the slow velocity component to said pen motor means comprises a second diode positioned to pass negative signals and block positive signals, said second diode coupled between the output of said differentiator and the switching positions of said switch when the left tympanic membrane of the patient is exposed to the cold temperature and when the right tympanic membrane of the patient is exposed to the hot temperature.
Claim 8
Dependent Claim
63 words
The improved apparatus of claim 6 wherein means are provided for normally positioning said pen motor approximately at the mid point of said media when the velocity is zero, and means for positioning said pen at the opposite extremes of said media when the output of said differentiating means is coupled to said recorder means through said positive and negative going diode, respectively.
References Cited (Backward Citations)
US3123768A
Cited
US2902030A
Cited
US3000271A
Cited
US3258008A
Cited
US3217706A
Cited
US3563231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |