Source: http://www.google.com/patents/US7641616?ie=ISO-8859-1&dq=6377161
Timestamp: 2014-12-27 19:42:48
Document Index: 255846103

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60']

Patent US7641616 - Blood pressure monitoring system and method of having an extended optical range - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA system and method for monitoring blood pressure of a wearer has an inflatable arm cuff that is selectably inflatable to differing air pressures that incorporates a fabric having both a light transmission property and a light reflection property when the fabric is illuminated with light having wavelength(s)...http://www.google.com/patents/US7641616?utm_source=gb-gplus-sharePatent US7641616 - Blood pressure monitoring system and method of having an extended optical rangeAdvanced Patent SearchPublication numberUS7641616 B2Publication typeGrantApplication numberUS 12/054,608Publication dateJan 5, 2010Filing dateMar 25, 2008Priority dateSep 12, 2003Fee statusPaidAlso published asCA2537530A1, CA2537586A1, CN1863482A, CN1863484A, CN100464702C, CN100496391C, EP1662985A1, EP1662985B1, EP1662991A2, EP1662991B1, EP1662999A1, EP1662999B1, US7381187, US7715897, US7725152, US7896810, US8018587, US8145291, US8428686, US20050106977, US20050118914, US20050277837, US20070293750, US20080177188, US20100094146, US20100198086, US20100198113, WO2005023104A2, WO2005023104A3, WO2005025414A1, WO2005046476A1Publication number054608, 12054608, US 7641616 B2, US 7641616B2, US-B2-7641616, US7641616 B2, US7641616B2InventorsGeorge W. Coulston, Thomas A. MickaOriginal AssigneeTextronics Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (19), Non-Patent Citations (2), Classifications (33), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetBlood pressure monitoring system and method of having an extended optical rangeUS 7641616 B2Abstract A system and method for monitoring blood pressure of a wearer has an inflatable arm cuff that is selectably inflatable to differing air pressures that incorporates a fabric having both a light transmission property and a light reflection property when the fabric is illuminated with light having wavelength(s) in the range from about 400 to about 2200 nanometers. A radiation source and a detector are attached to the fabric in relative positions such that the reception of incident radiation by the detector is directly affected by a change in the amount of light transmitted through the fabric relative to the amount of light reflected by the fabric as the fabric stretches in response to motion in the body of a wearer due to changes in the flow of blood through an artery disposed beneath the fabric occurring in consonance with variations in the air pressure within the inflatable cuff.
1. A method for monitoring blood pressure comprising the steps of:
inflating an inflatable cuff to modify the flow of blood through an artery located in the portion of the body of a wearer over which the cuff is disposed;
disposing in or over the inflatable cuff a fabric having an external surface and in which the amount of light transmitted through gaps between yarns forming the fabric relative to the light reflected by yarns forming the fabric changes when the fabric stretches;
using a radiation source mounted to the fabric to direct radiation onto the external surface of the fabric, wherein said radiation source directs radiation onto the fabric in the range from about 400 to about 2200 nanometers;
using a radiation detector responsive to incident radiation in the range from about 400 to about 2200 nanometers that is mounted to the fabric to detect the amount of light reflected by the yarns forming the fabric or transmitted through gaps between the yarns forming the fabric; and
recording the pressure in the cuff in response to the signal output from the detector.
recording the pressure comprises measuring the pressure in the cuff when the output of the detector is at a minimum value and measuring the pressure in the cuff when the signal from the detector lies within a predetermined range of a baseline signal value.
3. The method of claim 1, wherein the source and detector are attached to the fabric in relative positions such that the reception of incident radiation by the detector is directly affected by a change in the amount of light transmitted through the gaps between the yarns of the fabric relative to the amount of light reflected by the yarns of the fabric as the fabric stretches in response to motion in the body of a wearer due to changes in the flow of blood through an artery disposed beneath the fabric occurring in consonance with variations in the air pressure within the inflatable cuff.
4. The method of claim 1, wherein the fabric is disposed over the cuff.
5. The method of claim 1, wherein the fabric forms at least a portion of a patch.
6. The method of claim 1, wherein the radiation source is separable from the fabric.
7. The method of claim 1, wherein the radiation detector is separable from the fabric.
8. The method of claim 1, the fabric has a first and a second side; and wherein the radiation source and the radiation detector are mounted on the same side of the fabric.
9. The method of claim 1, wherein the fabric comprises reflective yarns and stretchable yarns.
10. A method for monitoring blood pressure of a wearer comprising the steps of:
inflating an inflatable cuff disposed over a portion of the body of a wearer to differing air pressures thereby to modify the flow of blood through an artery located in the portion of the body of a wearer over which the cuff is disposed;
disposing on, over or in the inflatable cuff a patch at least a portion of which is formed from a fabric having an external surface, which fabric stretches in response to motion in the body of a wearer due to changes in the flow of blood through an artery disposed beneath the patch;
using a radiation source mounted in or to the patch to direct radiation onto the external surface, said radiation source illuminating the patch with radiation in the range from about 400 to about 2200 nanometers;
using a radiation detector mounted in or to the patch, said radiation detector responsive to incident radiation in the range from about 400 to about 2200 nanometers to produce a signal representative thereof, the source and detector being in relative positions such that the reception of incident radiation by the detector is directly affected by a change in the amount of light transmitted through claps between yarns of the fabric relative to the light reflected by yarns of the fabric as the fabric stretches in response to motion in the body of a wearer due to changes in the flow of blood through an artery disposed beneath the patch occurring in consonance with variations in the air pressure within the inflatable cuff; and
recording the pressure in the cuff in response to the signal output from the detector when the output of the detector is at a minimum value and the pressure in the cuff following the minimum when the signal from the detector again lies within a predetermined range of a baseline signal value.
11. A method for monitoring blood pressure of a wearer, comprising the steps of:
inflating an inflatable cuff disposed over a portion of the body of a wearer to differing air pressures thereby to modify the flow of blood through an artery located in the portion of the body of a wearer over which the cuff is disposed, wherein a patch at least a portion of which is formed from a fabric having an external surface is disposed on, over or in the cuff, which fabric stretches in response to motion in the body of a wearer due to changes in the flow of blood through an artery disposed beneath the patch;
directing radiation onto the external surface with a source to illuminate the external surface with radiation in the range from about 400 to about 2200 nanometers;
detecting radiation with a radiation detector mounted in or to the patch, said radiation detector responsive to incident radiation in the range from about 400 to about 2200 nanometers to produce a signal representative thereof, the source and detector being in relative positions such that the reception of incident radiation by the detector is directly affected by a change in the amount of light transmitted through gaps between yarns of the fabric relative to the light reflected by yarns of the fabric as the fabric stretches in response to motion in the body of a wearer due to changes in the flow of blood through an artery disposed beneath the patch occurring in consonance with variations in the air pressure within the inflatable cuff;
recording the pressure in the cuff in response to signal output from the detector when the output of the detector is at a minimum value; and
recording the pressure in the cuff following the minimum value when the signal from the detector again lies within a predetermined range of a baseline signal value. Description
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a divisional of U.S. Ser. No. 10/937,121, filed Sep. 9, 2004, which issued as U.S. Pat. No. 7,381,187.
System for Monitoring Motion of a Member, U.S. Application No. 60/502,760; (LP-5345USPRV), filed in the name of Chia Kuo and George W. Coulston.
Blood Pressure Monitoring System and Method, U.S. Application No. 60/502,751; (LP-5347USPRV), filed in the names of George W. Coulston and Thomas A. Micka.
Reflective System for Monitoring Motion of a Member, U.S. Application No. 60/502,750; (LP-5346USPRV), filed in the name of George W. Coulston;
Subject mailer disclosed herein is disclosed in the following co-pending provisional applications filed Dec. 2, 2003, from which priority is claimed: Blood Pressure Monitoring System and Method Having Extended Optical Range, U.S. Application No. 60/526,187; (LP-5622USPRV), filed in the names of George W. Coulston and Thomas A. Micka.
Extended Optical Range Reflective System for Monitoring Motion of a Member, U.S. Application No. 60/526,429; (LP-5621USPRV), filed in the name of George W. Coulston.
Extended Optical Range System for Monitoring Motion of a Member, U.S. Application No. 60/526,188; (LP-5620USPRV), filed in the name of Chia Kuo and George W. Coulston.
As seen in FIG. 1, the system 10 includes a sleeve 12 having any convenient fabric construction (e.g., knitting, weaving) and made from any suitable textile filament apparel denier yarn. The sleeve 12 includes at least a portion, or patch 14, formed from a monitoring fabric 16. The monitoring fabric 16 has an interior surface 16I and exterior surface 16E. Although the patch 14 is represented as rectangular in shape in FIG. 1 it should be understood that the patch 14 may take any convenient or desired shape. If desired the entirety of the sleeve 12 may be made from the monitoring fabric 16.
In the preferred instance the reflective yarn is that yarn sold by Laird Sauquoit Technologies, Inc. (300 Palm Street, Scranton, Pa., 18505) under the trademark X-STATIC� yarn. X-STATIC� yarn is based upon a 70 denier (77 dtex), 34 filament textured nylon available from INVISTA North America S. � r. l., Wilmington, Del. 19805, as product ID 70-XS-34X2 TEX 5Z electroplated with electrically conductive silver.
In one preferred embodiment, the covered elastic yarn can be comprised of a twenty (20) denier (22 dtex) LYCRA� spandex yarn single-covered with a ten (10) denier (11 dtex) seven filament nylon yarn. LYCRA� spandex yarn is available from INVISTA North America S. � r. l., Wilmington, Del. 19805. Alternatively, the elastic yarn component of the present invention may comprise elastane yarn or polyester bicomponent yarns such as those known as ELASTERELL-P� from INVISTA� S. � r. l. North America Inc. of Wilmington, Del. The terms spandex and elastane are used interchangeably in the art. An example of a branded spandex yarn suitable for use with the present invention is LYCRA�.
Some examples of polyester component polymers include polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polytetrabutylene terephthalate. In one preferred embodiment polyester bicomponent filaments comprise a component of PET polymer and a component of PTT polymer in a side-by-side relationship as viewed in the cross section of the individual filament. One exemplary yarn having this structure is sold by DuPont Textiles and Interiors under the trademark T-400� Next Generation Fiber
Nylon yarns may comprise synthetic polyamide component polymers such as nylon 6, nylon 66, nylon 46, nylon 7, nylon 9, nylon 10, nylon 11, nylon 610, nylon 612, nylon 12 and mixtures and copolyamides thereof are preferred. In the case of copolyamides, especially preferred are those including nylon 66 with up to 40 mole percent of a polyadipamide wherein the aliphatic diamine component is selected from the group of diamines available from E. I. Du Pont de Nemours and Company, Inc. (Wilmington, Del., USA, 19880) under the respective trademarks DYTEK A� and DYTEK EP�
The principles of operation by which the motion of a subject's body due to geometric changes generated by blood pressure pulses may be monitored in accordance with the system of the present invention may be more clearly understood with reference to FIGS. 2A through 2F. In the discussion that follows both the source 18 and the detector 22 are mounted adjacent to the same surface 16E of the monitoring fabric 16 so as to operate in a reflection mode. Alternatively, it is contemplated within the scope of the invention to operate in a transmission mode. In the alternative transmission mode of operation, the source 18 and the detector 22 are mounted adjacent to the same surface 16I of the monitoring fabric 16.
This mean voltage VN results from the subtle flexing of the arterial walls and subsequent subtle movement of tissue underlying the fabric 16. This subtle movement is due to the arterial pressure fluctuations from the systolic to the diastolic pressure extremes. Because blood flow is laminar and silent during this interval the net average force on the arterial walls is constant. During the arbitrary time interval t0 to t1 the voltage reading from detector 22 is sampled; a voltage VN (+/−Δ) is stored in memory of the processor 26.
When, following the occurrence of the minimum voltage VL, the output voltage of the detector again returns to within the predetermined range about the baseline value (within the limits (VN+Δ and VN−Δ) the pressure in the cuff 20 passes through a point of equivalence with the diastolic (lowest) pressure in the brachial artery, uniquely defining t4. Any further drop in pressure in the cuff 30, to atmospheric pressure, produces no further rise in voltage at detector 22 during the time interval t4 to tt.
The system and method of the present invention may alternatively be operated in a transmission mode where the source 18 is disposed on side 16E of the fabric 16 while the detector 22 is disposed on the opposite side 16I. Such a disposition of source 18 and detector 22 is indicated in FIGS. 2A through 2D, where detector 22, on side 16I, is indicated in dot-dashed outline. The light balance between reflection and transmission will be the same as the situation discussed in connection with the reflection mode. However, the detector output voltage shown in FIG. 2F is reversed since more fabric stretch results in higher light transmission providing a commensurately higher detector voltage. The detector voltage waveform shown in FIG. 3 is therefore reversed in its sense. In FIG. 3, between the interval of time t1 to t2 the voltage is going low and reverses to high going between the interval of time t2 to t3. Finally, in FIG. 3 the detector voltage between t3 and t4 returns from high to VN.
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