US4995401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring anterior fontanelle pressure
Assignee: The University of Texas System
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Filing: 1988-02-26
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Granted: 1991-02-26
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Expires: 2008-02-26
Abstract
Abstract The present invention relates to a device for measuring anterior fontanelle pressure. A particular embodiment of this device comprises a rigid housing having an opening at its base end adapted for engaging a cranium and an aperture adapted to receive means for sensing pressure. The device may also include a flexible membrane disposed over the opening and adapted for engaging an anterior fontanelle. In this embodiment, the housing and membrane cooperate to define a cavity adapted to receive a fluid.
Inventors
- 👤 Leonid Bunegin
- 👤 Maurice S. Albin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/03; A61B5/031
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
51 words
A pressure sensing device comprising: rigid housing having a base end and an end opposite said base end, said base end defining an opening adapted for engaging a cranium of an infant circumferential to the anterior fontanelle and said opposite end defining an aperture adapted to receive means for sensing pressure.
Claim 2
Dependent Claim
51 words
A pressure sensing device comprising: rigid housing having a base end and an end opposite said base end, said base end defining an opening adapted for engaging a cranium of an infant circumferential to the anterior fontanelle and said opposite end defining an aperture adapted to receive means for sensing pressure.
Claim 3
Independent Claim
66 words
A device for sensing pressure at the anterior fontanelle, comprising a rigid housing having a base end adapted for engaging a bony cranium of an infant circumferential to the anterior fontanelle, an opening at said base end adapted for receiving a membrane adapted to engage the skin of an infant overlying the anterior fontanelle, and an aperture in said housing for receiving means for sensing pressure.
Claim 4
Independent Claim
66 words
A device for sensing pressure at the anterior fontanelle, comprising a rigid housing having a base end adapted for engaging a bony cranium of an infant circumferential to the anterior fontanelle, an opening at said base end adapted for receiving a membrane adapted to engage the skin of an infant overlying the anterior fontanelle, and an aperture in said housing for receiving means for sensing pressure.
Claim 5
Dependent Claim
39 words
The device of claim 1 or claim 2 further comprising: a flexible membrane disposed over the opening and adapted for engaging an anterior fontanelle; and the housing and membrane cooperating to define a cavity adapted to receive a fluid.
Claim 6
Dependent Claim
22 words
The device of claim 3 further comprising: a fluid filling the cavity; and means for detecting fluid pressure changes within the cavity.
Claim 7
Dependent Claim
18 words
The device of claim 1 or claim 2 wherein the opening has a diameter of about 35 mm.
Claim 8
Dependent Claim
20 words
The device of claim 1 or claim 2 wherein the housing has walls about 5 mm thick defining the opening.
Claim 9
Dependent Claim
29 words
The device of claim 1 or claim 2 wherein the distance from a plane defined by the base end of the housing to the aperture is about 15 mm.
Claim 10
Dependent Claim
17 words
The device of claim 1 or claim 2 wherein the housing is formed of a plastic material.
Claim 11
Dependent Claim
15 words
The device of claim 1 or claim 2 wherein the housing has a domed shape.
Claim 12
Dependent Claim
30 words
The device of claim 1 or claim 2 wherein the circumference of the opening at the base end is equal to or greater than the circumference of an infant fontanelle.
Claim 13
Dependent Claim
20 words
The device of claim 1 or claim 2 wherein the aperture is positioned opposite the opening of the base end.
Claim 14
Dependent Claim
96 words
The device of claim 1 or claim 2 wherein the aperture comprises: (a) an external collar defining a port; (b) a retainer cap having an annular side wall and a top wall extending radially inward to define an opening in the cap; and (c) means for engaging the outer surface of the collar with the inner surface of the annular wall of the retainer cap so as to facilitate sandwiching a member of a pressure sensing means between the upper surface of the collar and the internal surface of the top wall of the retainer cap.
Claim 15
Dependent Claim
21 words
The device of claim 1 or claim 2 further comprising means for mounting the housing on the head of an infant.
Claim 16
Dependent Claim
14 words
The device of claim 13 wherein the means comprises a harness having elastic straps.
Claim 17
Dependent Claim
13 words
The device of claim 3 wherein the flexible membrane comprises a silicon membrane.
Claim 18
Dependent Claim
17 words
The device of claim 3 wherein the flexible membrane is affixed to the housing with an adhesive.
Claim 19
Dependent Claim
17 words
The device of claim 3 further comprising an O-ring adapted for attaching the membrane to the housing.
Claim 20
Dependent Claim
12 words
The device of claim 4 wherein the fluid comprises an incompressible fluid.
Claim 21
Dependent Claim
12 words
The device of claim 18 wherein the fluid comprises an aqueous fluid.
Claim 22
Dependent Claim
11 words
The device of claim 18 wherein the fluid comprises liquid silicone.
Claim 23
Dependent Claim
14 words
The device of claim 4 wherein the pressure sensing means comprises a pneumatic switch.
Claim 24
Dependent Claim
31 words
The device of claim 4 wherein a pressure sensing element of the pressure sensing means is disposed in the aperture in the housing to communicate with the fluid in the cavity.
Claim 25
Independent Claim
115 words
A method for measuring intracranial pressure comprising: (a) providing a pressure sensing device enclosing a fluid-filled cavity said device having a rigid housing with a flexible membrane window and means for sensing pressure communicating with the fluid in the cavity; (b) applying the device to the cranium of an infant in a manner such that the flexible membrane lies adjacent to the skin covering the anterior fontanelle, the rigid housing is supported by the cranium, and deformation of the skin covering the fontanelle causes a corresponding deformation of the flexible membrane and thereby changes the fluid pressure within the cavity; and (c) detecting the fluid pressure change within the cavity with the pressure sensing means.
Claim 26
Independent Claim
115 words
A method for measuring intracranial pressure comprising: (a) providing a pressure sensing device enclosing a fluid-filled cavity said device having a rigid housing with a flexible membrane window and means for sensing pressure communicating with the fluid in the cavity; (b) applying the device to the cranium of an infant in a manner such that the flexible membrane lies adjacent to the skin covering the anterior fontanelle, the rigid housing is supported by the cranium, and deformation of the skin covering the fontanelle causes a corresponding deformation of the flexible membrane and thereby changes the fluid pressure within the cavity; and (c) detecting the fluid pressure change within the cavity with the pressure sensing means.
Claim 27
Dependent Claim
110 words
The method of claim 23 further comprising: (a) providing pressure sensing means having a rigid casing defining a bore and a flexible sensor membrane disposed over one end of the casing; (b) affixing the pressure sensing means to the housing so that the sensor membrane communicates with the fluid in the cavity of the device; (c) pressurizing the bore to a reference pressure, said reference pressure being substantially equal to the pressure of the fluid in the device cavity; (d) measuring the reference pressure; (e) venting the bore to a pressure substantially lower than the pressure of the fluid in the cavity of the device; and (f) repeating steps (c)-(e).
Claim 28
Dependent Claim
19 words
The method of claim 23 wherein the device is applied to the cranium with a harness having elastic straps.
References Cited (Backward Citations)
US3123068A
Cited
US2039337A
Cited
US2583941A
Cited
US2799270A
Cited
US3184960A
Cited
US3299882A
Cited
US3359789A
Cited
US3593704A
Cited
US3534733A
Cited
US3704708A
Cited
US3658054A
Cited
US3811429A
Cited
US4281667A
Cited
US4265252A
Cited
US4312361A
Cited
US4559953A
Cited
SU1007653A2
Cited
US4462409A
Cited
US4502491A
Cited
GB2120901A
Cited
US4610256A
Cited
US4610256B1
Cited
US4777961A
Cited
US4672976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |