US3984708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic tactile stimulator
Assignee: Medical Research Institute
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Filing: 1975-09-11
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Granted: 1976-10-05
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Expires: 1995-09-11
Abstract
Abstract An improved electromagnetic tactile stimulator is disclosed for preferable use in a matrix array. A plurality of such stimulators are confronted to impart vibratory impulses of varying intensity to the skin of a subject to augment typically lost sensual modality such as sight or sound. Each electromagnetic tactile stimulator is in the form of a solenoid having a magnetically polarized plunger.
Inventors
- 👤 Gordon Wayne Holmlund
- 👤 Albert Barry Alden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:26
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/04; A61F11/045; G; G09; G09B; G09B21/00; G09B21/001; G09B21/003; H; H02; H02K; H02K33/00; H02K33/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
An improved electromagnetic tactile stimulator comprising means for defining a toroidal, high permeability, magnetic field including an inner sleeve, an outer sleeve, and forward and rear disk shaped walls extending between said sleeves to define interior of said sleeves and walls a toroidal, high permeability path; a plunger magnetically polarized having an external diameter for a freely moving fit interior of said inner sleeve defining the inside portion of said toroidal, high permeability path and having a longitudinal length to the external diameter ratio of 6:1; a winding of wire interior of said toroid between said disks having a length in the range of 4/16 to 6/16 of the length between said disks wth the center wind of said winding positioned in the range between 20/32 and 22/32 from said rear disk to said forward disk; and, a stimulator tip attached to said permanent magnet in coaxial relationship to protrude outwardly from said polarized magnetic core of said stimulator to impart stimulating mechanical vibrations for tactile perception of a subject.
Claim 2
Dependent Claim
170 words
An improved electromagnetic tactile stimulator comprising means for defining a toroidal, high permeability, magnetic field including an inner sleeve, an outer sleeve, and forward and rear disk shaped walls extending between said sleeves to define interior of said sleeves and walls a toroidal, high permeability path; a plunger magnetically polarized having an external diameter for a freely moving fit interior of said inner sleeve defining the inside portion of said toroidal, high permeability path and having a longitudinal length to the external diameter ratio of 6:1; a winding of wire interior of said toroid between said disks having a length in the range of 4/16 to 6/16 of the length between said disks wth the center wind of said winding positioned in the range between 20/32 and 22/32 from said rear disk to said forward disk; and, a stimulator tip attached to said permanent magnet in coaxial relationship to protrude outwardly from said polarized magnetic core of said stimulator to impart stimulating mechanical vibrations for tactile perception of a subject.
Claim 3
Dependent Claim
31 words
The invention of claim 1 and wherein said toroidal, high permeability path is twice as long between said disk shaped walls as it is between the walls of said outer sleeve.
Claim 4
Dependent Claim
20 words
The invention of claim 1 and wherein said winding has a length of 5/16 of the length between said disks.
Claim 5
Dependent Claim
27 words
The invention of claim 1 and wherein the center wind of said winding is positioned at 21/32 the distance from said rear disk to said forward disk.
Claim 6
Dependent Claim
167 words
An improved electromagnetic tactile stimulator comprising means for defining a toroidal, high permeability, magnetic field including an inner sleeve, an outer sleeve, and forward and rear disk-shaped walls extending between said sleeve to define interior of said sleeves and walls a toroidal, high permeability path; a permanently magnetized magnet having a length and an external diameter the ratio of which is 6:1 movably situated interior said inner sleeve; a stimulator tip attached to said permanent magnet in coaxial relationship to protrude outwardly from said polarized magnetic core of said stimulator to impart stimulating magnetic vibrations for tactile perception of a subject; a winding of wire interior of said toroid between said disks having the length of 4/16 to 6/16 of the length between said disk with the center wind of said winding positioned in the range between 20/32 and 22/32 from said rear disk to said forward disk; and, means for generating a half wave, rectified current, said half wave, rectified current interrupted between 102° and 122°.
Claim 7
Dependent Claim
167 words
An improved electromagnetic tactile stimulator comprising means for defining a toroidal, high permeability, magnetic field including an inner sleeve, an outer sleeve, and forward and rear disk-shaped walls extending between said sleeve to define interior of said sleeves and walls a toroidal, high permeability path; a permanently magnetized magnet having a length and an external diameter the ratio of which is 6:1 movably situated interior said inner sleeve; a stimulator tip attached to said permanent magnet in coaxial relationship to protrude outwardly from said polarized magnetic core of said stimulator to impart stimulating magnetic vibrations for tactile perception of a subject; a winding of wire interior of said toroid between said disks having the length of 4/16 to 6/16 of the length between said disk with the center wind of said winding positioned in the range between 20/32 and 22/32 from said rear disk to said forward disk; and, means for generating a half wave, rectified current, said half wave, rectified current interrupted between 102° and 122°.
Claim 8
Dependent Claim
40 words
The invention of claim 5 and wherein said rear disk is adjusted in mass with respect to said magnetically polarized plunger to resonate in the range of 50Hz to 60Hz when said stimulator tip is contacted with said human skin.
Claim 9
Dependent Claim
17 words
The invention of claim 5 and wherein said half wave, rectified current is lopped off at 112°.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |