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Publication numberUS3853118 A
Publication typeGrant
Publication dateDec 10, 1974
Filing dateAug 29, 1973
Priority dateAug 29, 1973
Publication numberUS 3853118 A, US 3853118A, US-A-3853118, US3853118 A, US3853118A
InventorsR Schendel
Original AssigneeMeasurand Syst, Newpark Resources Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Swelling detector
US 3853118 A
A swelling detector for detecting the swelling in a member of a patient's body which includes a pressure responsive transducer applied to the member for monitoring changes in the volume thereof.
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Description  (OCR text may contain errors)

United States Patent Schendel Dec. 10, 1974 [5 SWELLING DETECTOR 3,533,095 10/1970 Collins 119/1 x [75] Inventor: Robert E. Schendel, Houston, Tex. ggg g [73] Assignee: Measurand Systems, a division of 31680386 8/1972 l 73/379 R Newpark Resources Inc. New 3,782,368 l/l974 Relbold 128/2 S Orleans, La.

[22] Filed: Aug, 29, 1973 Primary ExaminerAldrich F. Medbery 1 pp O 392,8 8 Attorney, Agent, or Firm-Michael P. Breston' 52 us. (:1. 128/2 s, 73/379 R 57 ABSTRACT [51] Int. Cl A61b 5/10 E 1 [581 Field Search 128/2 5, 2 R105 P; A swelling detector for detecting the swelling in a 73/379; 1 19/ 1 member of a patients body which includes a pressure responsive transducer applied to the member for mon- [56] References Clted itoring changes in the volume thereof.

UNITED STATES PATENTS 3,520,294 7/1970 Fuzz ell et a1. 128/2 S 1 Claim, 3 Drawing Figures PAIENIEB sic 01914 FIG. I.

RECORDER BRIDGE CIRCUIT PRESSURE T RANSDUCER SWELLING DETECTOR BACKGROUND OF THE INVENTION Intravenous alimentation is extensively used in hospitals on patients of various ages including infants. When an intravenous needle accidentally moves out of the blood vessel, the liquid being delivered spreads into the surrounding tissues causing painful swelling thereof. When such abnormal delivery is detected at an early stage, the liquid-delivery means can be stopped and the swelling prevented.

Accordingly, it is a broad object of the present invention to provide a swelling detector for use on portions of a patients body for detecting swelling thereof.

SUMMARY OF THE INVENTION This invention provides a swelling detector for detecting the swelling in a patients body member to which liquiddelivering means are inserted into a blood vessel thereof for delivering liquid thereto. A pressureresponsive element is constructed and arranged to be attached to the member, near the liquid-delivering means, for detecting a change in the pressure exerted a by the member. The output signal from the pressureresponsive detector is indicative of the swelling of the member.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic representation of the swelling detector of the present-invention;

FIG. 2 shows one type of pressure transducer that can be used in the detector of FIG. 1; and

FIG. 3 shows another type of pressure transducer.

Referring now to FIGS. 1 and 2 of the drawings, there is shown a portion of a body of a patient, such as an arm 10, to which is coupled an intravenous feeding device 12 from which a suitable liquid is fed through a conduit 14 into a needle (not shown) inserted in a blood vessel of the patient.

Under normal operating conditions the needle remains in the blood vessel and the liquid is fed into the blood circulation system of the patient. Under abnormal operating conditions, however, the needle may withdraw from the blood vessel thereby causing the supplied liquid to spread into adjacent tissues resulting in swelling thereof.

The swelling is almost instantaneous and accordingly it is desired to detect an intravenous-feeding abnormality as soon as the swelling starts. The swelling detector, generally designated as 20, typically includes but is not limited to a band or tape 22 to which is secured a pressure transducer generally designated as 24 for measuring the change in pressure produced by the expansion of the body member. The pressure transducer is arranged to produce an output warning signal which can be mechanically, optically, or electronically amplified.

- change. This causes the electrical resistance of the wire to change. Even though this resistance change is small, often a fraction of an ohm, a suitable bridge network 30 can be used to detect such small variations. The

strain gauge is sensitive enough to detect strains as low as 0.0001 inch per inch or better.

The bridge network 30 can be made to feed an alarm signal to a central station 32 having a recorder 34 for continuously monitoring the condition of one or more swelling detectors 20 on patients in the hospital. A suitable visual or audio alarm can be obtained from the recorder upon the occurrence of an abnormality in a patients intravenous feeding system.

Pressure-responsive elements other than strain gauges can of course be employed. For example, it may be desirable to employ a pressure detector (FIG. 3) containing a fluid 42 (gas or liquid) in an envelope 40 and to monitor with a pressure transducer 44 the pressure variations in the fluid in response to an expansion in the patients body member caused by swelling. Other variations will readily become apparent to those skilled in the an.

What is claimed is:

Y 1. In a method for delivering a liquid through a needle into a blood vessel of a patients arm whereby under normal conditions the needle remains in the blood vessel and the liquid is fed into the blood circulation system of the patient, and under abnormal conditions, the needle withdraws from the blood vessel thereby causing the supplied liquid to spread into adjacent tissues, the spreading of the liquid resulting in swelling of the arm, said method comprising:

attaching a band around said arm near said needle,

the band containing a fluid chamber, the pressure of said fluid in said chamber increasing with the swelling of said arm,

coupling a pressure transducer to said chamber for detecting the pressure increase in said chamber, and converting the pressure increase to a warning signal of said abnormal conditions.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3520294 *Jan 26, 1968Jul 14, 1970Electro Medical System IncLabor contraction monitoring system
US3533095 *Jan 2, 1969Oct 6, 1970James CollinsInflatable pad with alarm
US3582935 *Oct 24, 1968Jun 1, 1971Verhaeghe Richard LPosture control and correcting device
US3662743 *Jan 22, 1970May 16, 1972Corometrics Medical Systems InPressure transducer for catheter pressure measurement
US3680386 *May 6, 1970Aug 1, 1972Utah Research & Dev Co IncPhysical therapy diagnostic device
US3782368 *May 24, 1971Jan 1, 1974Mc Donnell Douglas CorpTransducer construction and system for measuring respiration
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US3937212 *Dec 27, 1974Feb 10, 1976NasaMiniature muscle displacement transducer
US4084430 *Sep 9, 1976Apr 18, 1978United Kingdom of Great Britain and Northern Ireland, The Secretary of State for Industry in Her Britannic Majesty's Government of theLoad measurement
US4122837 *Aug 2, 1976Oct 31, 1978Leonard Loren WBody surface contour deformation
US4122838 *Aug 9, 1976Oct 31, 1978Leonard Loren WBody surface contour deformation sensor
US4747415 *Aug 27, 1987May 31, 1988Pierre LavoisierMethod and device for measuring penile rigidity
US5087245 *Mar 13, 1989Feb 11, 1992Ivac CorporationSystem and method for detecting abnormalities in intravascular infusion
US5437610 *Jan 10, 1994Aug 1, 1995Spinal Cord SocietyExtremity pump apparatus
US5564435 *Jan 5, 1996Oct 15, 1996Steinberg; BruceNoninvasive compartment measurement device
US5891065 *Jul 31, 1996Apr 6, 1999Spinal Cord SocietyMobile extremity pumping apparatus
US8013750Feb 23, 2007Sep 6, 2011Carsten SandholdtDevice for detecting haematoma or subcutaneous haemorrhage after percutaneous coronary intervention
US8057406Apr 17, 2007Nov 15, 2011Acist Medical Systems, Inc.Extravasation detection device
US20090204070 *Apr 17, 2007Aug 13, 2009Acist Medical Systems, Inc.Extravasation detection device
EP2012670A2 *Apr 17, 2007Jan 14, 2009ACIST Medical Systems, Inc.Extravasation detection device
EP2012670B1 *Apr 17, 2007Oct 8, 2014ACIST Medical Systems, Inc.Extravasation detection device
WO2007097635A1 *Feb 23, 2007Aug 30, 2007Carsten SandholdtA device for controlling and detecting hematomia or subepitelial haemorrage after percutaneous coronary intervention
WO2009125327A1 *Apr 3, 2009Oct 15, 2009Koninklijke Philips Electronics N.V.Detection of fluid retention in a patient
U.S. Classification600/595, 340/573.1, 604/66, 604/506, 340/626, 604/505
International ClassificationA61B5/103, A61B5/107
Cooperative ClassificationA61B5/107, A61B5/1073, A61B5/6824, A61B5/6831
European ClassificationA61B5/107C, A61B5/107