US20010015292A1 - Patient weighing apparatus - Google Patents
Patient weighing apparatus Download PDFInfo
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- US20010015292A1 US20010015292A1 US09/738,845 US73884500A US2001015292A1 US 20010015292 A1 US20010015292 A1 US 20010015292A1 US 73884500 A US73884500 A US 73884500A US 2001015292 A1 US2001015292 A1 US 2001015292A1
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- Prior art keywords
- patient
- bed
- weight
- flexible
- potentiometer
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/44—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons
- G01G19/445—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons in a horizontal position
Definitions
- This invention relates to weighing patients in a hospital bed and particularly to a new arrangement for weighing sick patients.
- the present weighing systems for bedridden patients in hospitals and/or long term care facilities include chairs and/or bulky slings coupled with scales in which a patient is moved from his/her bed for purposes of weighing. These systems are cumbersome and require a substantial amount of human intervention to operate. Many sick patients are too unstable to tolerate the amount of motion these systems require of them.
- Other present devices include a large scale upon which an empty bed is first weighed as a calibration followed by subsequent weighing of the patient/bed combination at a later time. A patient's weight is thus found by subtracting the initial bed weight from the combination total. Such a scale is expensive and thus represents a limited resource. These devices may not be suitable if a patient's stay in a facility extends over a prolonged period of time.
- Some examples of conditions where the weight of a patient is a significant indicator of the effectiveness of treatment include, but are not limited to, Congestive Heart Failure, Open Heart Surgery, Vascular Surgery, Sepsis and Extreme Diarrhea/Intestinal Upset. Said conditions often render a patient weak, debilitated and unable to stand without assistance, thus making it almost impossible to weigh him/her in the conventional manner (i.e., standing up on a scale).
- a treatment for Congestive Heart Failure includes the elimination of retained excess fluid wherein body weight is a clear indication of success or failure of said treatment.
- Open Heart Surgery which is often characterized by Congestive Heart Failure, wherein additional fluid is added to the body during surgery.
- Vascular Surgery which may often be performed on Congestive Heart Failure patients, blood vessels leak resulting in excess body water which must be excreted by the kidneys.
- Sepsis which is a condition wherein bacteria is found in the blood stream, also results in leakage of water from blood vessels into tissues necessitating treatment with additional fluid in order to maintain blood pressure.
- a bed position and activity sensing apparatus could be constructed by using an elongated sensor for placement parallel to one axis of the bed.
- the sensor includes first and second conductive members where the first conductive member has a resistance per unit length substantially different from that of the second conductor member.
- One of the conductive members is electrically coupled to a source of electrical power wherein the weight of the body in the bed urges the first and second conductive members together to define an electrical path for output of a sensor signal which varies in magnitude responsive to the position of the body along the sensor.
- a flexible potentiometer is mounted on top of a bed or mattress having a known compliance, i.e. known degree of flexure for a given weight, and connected to an electrical system for detecting and measuring the resistance of the potentiometer, thus to indicate the weight of a patient.
- the flexible potentiometer is adhered to a sheet of plastic, such as Mylar, and placed upon the bed like a protective sheet for the bed.
- a plurality of flexible potentiometers are adhered to the sheet of plastic to enable weighting of the patient without regard to the position of the patient in the bed.
- the output of the apparatus can be used for directly ascertaining a patient's weight and displaying/recording thus weight.
- the output may also be used to help control servo mechanisms in medication dispensing devices. For example, in infusion pumps the rate can be continuously adjusted as the patient's weight changes.
- Other such servo/feedback devices could be applied to other devices such as hemodialysis machines (artificial kidneys).
- the flexible potentiometer is connected to a medicine-dispensing machine wherein a signal indicative of the resistance of the potentiometer is fed back to the medicine-dispensing unit so as to continually adjust the rate at which such medicine is dispensed.
- FIG. 1 is a drawing of a plastic sheet with six flexible potentiometers adhered thereto.
- FIG. 2 is a picture of a hospital bed with the plastic sheet of FIG. 1 placed thereon wherein the potentiometers are connected to a medicine-dispensing machine.
- FIG. 3 is a circuit diagram of circuitry for monitoring the resistance of the potentiometers in FIG. 2.
- FIG. 1 we see a plastic sheet 10 that has six flexible potentiometers 11 a - 11 g adhered thereto.
- Each of the potentiometers is preferably a potentiometer as shown and described in U.S. Pat. No. 5,157,372 incorporated herein aforesaid.
- Each of the potentiometers 11 a - 11 f has a pair of leads 12 a - 12 f and 13 a - 13 f respectively, connecting the potentiometer to a connector 14 at the edge of the plastic sheet 10 .
- the conductors 12 a - 12 f and 13 a - 13 f may be printed conductors also adhered to the plastic sheet 10 .
- the connector 14 is connected by a ribbon conductor cable 15 to connector 16 which is used to electrically connect each of the potentiometers 11 a - 11 f to monitoring circuitry shown in FIGS. 2 and 3.
- FIG. 2 we see a hospital bed 17 having the sheet 10 placed thereon with the potentiometers 11 a - 11 f attached to said sheet.
- the conductor 15 connects the potentiometers 11 a - 11 f on the sheet 10 to a monitoring unit 18 that is hanging on a pole 16 next to the bed 17 .
- Said monitoring unit 18 may be stand-alone or be part of larger patient monitoring system integrated therein, such as but not limited to that sold by Hewlett Packard Company.
- a second ribbon conductor cable 19 connects an output signal from the monitoring unit or system 18 to an existing medicine-dispensing device 21 , such as but not limited to those currently made and sold by the Ivac Corporation, Baxter Company, Marquette Company and the Alaris Company.
- the bed 17 has a mattress 22 supported by the bed 17 which has a known degree of flexure for each particular weight of a patient, i.e. a know compliance. If the compliance is not known, it can be measured with a known weight so as to be calibrated to the known compliance.
- the monitoring unit 18 has a microprocessor 23 therein that is connected to the conductors 12 a - 12 f and 13 a - 13 f by the ribbon conductor cable 15 .
- the microprocessor 23 is also connected to a read only memory (ROM) 24 , or any other non-volatile memory, which stores therein the information relating to the resistance versus flexure characteristics of the potentiometers 11 a - 11 f and the mattress 22 of the bed 17 .
- ROM read only memory
- the microprocessor 23 is also connected to a random access memory (RAM) 26 .
- the microprocessor 23 together with the RAM 26 and ROM 24 calculate the weight of the patient in the bed 17 .
- the monitoring unit 18 compares the values of each of the potentiometers to determine the position of the patient in the bed 17 and calculates the patients weight, using a select one or more of the potentiometers 11 a - 11 f , in accordance with such additional information.
- the result of the calculation is displayed on a LED display 27 .
- the result is also provided to the medicine-dispensing device 21 by the ribbon cable 19 to control the rate at which the medicine is dispensed.
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Abstract
Description
- This application is a continuation of U.S. Non-Provisional Application Ser. No. 09/261,263, which was filed on Mar. 3, 1999.
- The entire disclosure of the forgoing patent application is incorporated by reference as if set forth at length herein.
- This invention relates to weighing patients in a hospital bed and particularly to a new arrangement for weighing sick patients.
- There are many medical conditions which may be treated more effectively than they are today if the weight of a patient having such a condition could be easily and continuously monitored without the need to either get the patient out of bed or weigh the bed separately from the patient for weighing with the patient in combination at a later time.
- The present weighing systems for bedridden patients in hospitals and/or long term care facilities include chairs and/or bulky slings coupled with scales in which a patient is moved from his/her bed for purposes of weighing. These systems are cumbersome and require a substantial amount of human intervention to operate. Many sick patients are too unstable to tolerate the amount of motion these systems require of them. Other present devices include a large scale upon which an empty bed is first weighed as a calibration followed by subsequent weighing of the patient/bed combination at a later time. A patient's weight is thus found by subtracting the initial bed weight from the combination total. Such a scale is expensive and thus represents a limited resource. These devices may not be suitable if a patient's stay in a facility extends over a prolonged period of time.
- Some examples of conditions where the weight of a patient is a significant indicator of the effectiveness of treatment include, but are not limited to, Congestive Heart Failure, Open Heart Surgery, Vascular Surgery, Sepsis and Extreme Diarrhea/Intestinal Upset. Said conditions often render a patient weak, debilitated and unable to stand without assistance, thus making it almost impossible to weigh him/her in the conventional manner (i.e., standing up on a scale).
- A treatment for Congestive Heart Failure includes the elimination of retained excess fluid wherein body weight is a clear indication of success or failure of said treatment. The same can be said of Open Heart Surgery, which is often characterized by Congestive Heart Failure, wherein additional fluid is added to the body during surgery. Further, during Vascular Surgery, which may often be performed on Congestive Heart Failure patients, blood vessels leak resulting in excess body water which must be excreted by the kidneys. Sepsis, which is a condition wherein bacteria is found in the blood stream, also results in leakage of water from blood vessels into tissues necessitating treatment with additional fluid in order to maintain blood pressure. Lastly, the treatment of Extreme Diarrhea and Irritated Intestines often require massive amounts of fluid recucitation to treat dehydration. For each of these conditions the patient's body weight is a marker for clinical progress or lack thereof. Indeed, all of these conditions require monitoring of the patient's body weight in order to regulate the treatment for the condition. Therefore, a simple and easy way to consistently and continuously weigh a patient throughout his/her treatment is necessary.
- Thus, there is a need for a system that can monitor the weight of a patient in a hospital bed without the need to move the patient. There is a further need for such a system to be inexpensive and easy to operate.
- Systems have been suggested to monitor the presence or absence of patients in hospital beds automatically, but none for continuously monitoring their weight while in the bed, independent of the bed's weight itself. It has been suggested that a bed position and activity sensing apparatus could be constructed by using an elongated sensor for placement parallel to one axis of the bed. The sensor includes first and second conductive members where the first conductive member has a resistance per unit length substantially different from that of the second conductor member. One of the conductive members is electrically coupled to a source of electrical power wherein the weight of the body in the bed urges the first and second conductive members together to define an electrical path for output of a sensor signal which varies in magnitude responsive to the position of the body along the sensor.
- Such a system is shown in U.S. Pat. No. 5,353,012, which issued on Oct. 4, 1994 to Barham et al. and is entitled “Bed Position and Activity Sensing Apparatus”. Other patents relating to this subject matter are U.S. Pat. No. 5,844,488 which issued Dec. 1, 1988 to Musick and is entitled “Bed Sensor and Alarm” and U.S. Pat. No. 4,565,910 which issued Jan. 21, 1986 to Mersick et al. and is entitled “Switch Apparatus Responsive to Distortion”. These systems, while having an electrical device mounted in a patient's bed or adhered to a patient's sheet, are used for sensing the whereabouts of the patient and are not used for weighing the patient.
- Devices exist similar to the switches of the above mentioned patents which are used as potentiometers. Such a device is disclosed in U.S. Pat. No. 5,157,372 (“the '372 patent”), which issued Oct. 20, 1992 to Langford and is entitled “Flexible Potentiometer”. The '372 patent is hereby incorporated by reference as though fully set forth herein. Such devices are manufactured and sold by Flexpoint of Midvale, Utah 84047 under the title of Flexible Sensor Systems. It is known that the degree of flexure of such a device will provide a measurable resistance indicative of the curvature thereof.
- In the present invention, a flexible potentiometer is mounted on top of a bed or mattress having a known compliance, i.e. known degree of flexure for a given weight, and connected to an electrical system for detecting and measuring the resistance of the potentiometer, thus to indicate the weight of a patient. In one embodiment, the flexible potentiometer is adhered to a sheet of plastic, such as Mylar, and placed upon the bed like a protective sheet for the bed. In a further embodiment a plurality of flexible potentiometers are adhered to the sheet of plastic to enable weighting of the patient without regard to the position of the patient in the bed.
- The output of the apparatus can be used for directly ascertaining a patient's weight and displaying/recording thus weight. The output may also be used to help control servo mechanisms in medication dispensing devices. For example, in infusion pumps the rate can be continuously adjusted as the patient's weight changes. Other such servo/feedback devices could be applied to other devices such as hemodialysis machines (artificial kidneys).
- In another embodiment, the flexible potentiometer is connected to a medicine-dispensing machine wherein a signal indicative of the resistance of the potentiometer is fed back to the medicine-dispensing unit so as to continually adjust the rate at which such medicine is dispensed.
- FIG. 1 is a drawing of a plastic sheet with six flexible potentiometers adhered thereto.
- FIG. 2 is a picture of a hospital bed with the plastic sheet of FIG. 1 placed thereon wherein the potentiometers are connected to a medicine-dispensing machine.
- FIG. 3 is a circuit diagram of circuitry for monitoring the resistance of the potentiometers in FIG. 2.
- Referring now to FIG. 1, we see a
plastic sheet 10 that has six flexible potentiometers 11 a-11 g adhered thereto. Each of the potentiometers is preferably a potentiometer as shown and described in U.S. Pat. No. 5,157,372 incorporated herein aforesaid. Each of the potentiometers 11 a-11 f has a pair of leads 12 a-12 f and 13 a-13 f respectively, connecting the potentiometer to aconnector 14 at the edge of theplastic sheet 10. The conductors 12 a-12 f and 13 a-13 f may be printed conductors also adhered to theplastic sheet 10. Theconnector 14 is connected by aribbon conductor cable 15 toconnector 16 which is used to electrically connect each of the potentiometers 11 a-11 f to monitoring circuitry shown in FIGS. 2 and 3. - Referring now to FIG. 2 we see a
hospital bed 17 having thesheet 10 placed thereon with the potentiometers 11 a-11 f attached to said sheet. Theconductor 15 connects the potentiometers 11 a-11 f on thesheet 10 to amonitoring unit 18 that is hanging on apole 16 next to thebed 17. Saidmonitoring unit 18 may be stand-alone or be part of larger patient monitoring system integrated therein, such as but not limited to that sold by Hewlett Packard Company. A secondribbon conductor cable 19 connects an output signal from the monitoring unit orsystem 18 to an existing medicine-dispensingdevice 21, such as but not limited to those currently made and sold by the Ivac Corporation, Baxter Company, Marquette Company and the Alaris Company. Thebed 17 has amattress 22 supported by thebed 17 which has a known degree of flexure for each particular weight of a patient, i.e. a know compliance. If the compliance is not known, it can be measured with a known weight so as to be calibrated to the known compliance. - Referring now the FIG. 3 we see the details of the
monitoring unit 18. Themonitoring unit 18 has amicroprocessor 23 therein that is connected to the conductors 12 a-12 f and 13 a-13 f by theribbon conductor cable 15. Themicroprocessor 23 is also connected to a read only memory (ROM) 24, or any other non-volatile memory, which stores therein the information relating to the resistance versus flexure characteristics of the potentiometers 11 a-11 f and themattress 22 of thebed 17. - The
microprocessor 23 is also connected to a random access memory (RAM) 26. Themicroprocessor 23 together with theRAM 26 andROM 24 calculate the weight of the patient in thebed 17. When the multiple potentiometers 11 a-11 f are used themonitoring unit 18 compares the values of each of the potentiometers to determine the position of the patient in thebed 17 and calculates the patients weight, using a select one or more of the potentiometers 11 a-11 f, in accordance with such additional information. The result of the calculation is displayed on aLED display 27. The result is also provided to the medicine-dispensingdevice 21 by theribbon cable 19 to control the rate at which the medicine is dispensed. - While this invention has been described with respect to a particular embodiment thereof, those of ordinary skill in the art can make various modifications thereof without departing from the spirit or scope thereof.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/738,845 US6396004B2 (en) | 1999-03-03 | 2000-12-15 | Patient weighing apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/261,362 US6180893B1 (en) | 1999-03-03 | 1999-03-03 | Patient weighing apparatus |
US09/738,845 US6396004B2 (en) | 1999-03-03 | 2000-12-15 | Patient weighing apparatus |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/261,263 Continuation US6234345B1 (en) | 1999-03-03 | 1999-03-03 | Transportation vending machine |
US09/261,362 Continuation US6180893B1 (en) | 1999-03-03 | 1999-03-03 | Patient weighing apparatus |
Publications (2)
Publication Number | Publication Date |
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US20010015292A1 true US20010015292A1 (en) | 2001-08-23 |
US6396004B2 US6396004B2 (en) | 2002-05-28 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/261,362 Expired - Lifetime US6180893B1 (en) | 1999-03-03 | 1999-03-03 | Patient weighing apparatus |
US09/738,845 Expired - Lifetime US6396004B2 (en) | 1999-03-03 | 2000-12-15 | Patient weighing apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US09/261,362 Expired - Lifetime US6180893B1 (en) | 1999-03-03 | 1999-03-03 | Patient weighing apparatus |
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Cited By (5)
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US20070261894A1 (en) * | 2006-05-11 | 2007-11-15 | Loadstar Sensors, Inc. | Capacitive force-measuring device based load sensing platform |
US8090478B2 (en) | 2005-06-10 | 2012-01-03 | Hill-Rom Services, Inc. | Control for pressurized bladder in a patient support apparatus |
US8717181B2 (en) | 2010-07-29 | 2014-05-06 | Hill-Rom Services, Inc. | Bed exit alert silence with automatic re-enable |
US9875633B2 (en) | 2014-09-11 | 2018-01-23 | Hill-Rom Sas | Patient support apparatus |
US10292605B2 (en) | 2012-11-15 | 2019-05-21 | Hill-Rom Services, Inc. | Bed load cell based physiological sensing systems and methods |
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US6674024B2 (en) * | 1996-12-19 | 2004-01-06 | Automotive Systems Laboratory, Inc | Seat weight sensor |
US6721980B1 (en) * | 1998-10-28 | 2004-04-20 | Hill-Fom Services, Inc. | Force optimization surface apparatus and method |
US6180893B1 (en) * | 1999-03-03 | 2001-01-30 | Peter Salgo | Patient weighing apparatus |
US7834768B2 (en) * | 1999-03-05 | 2010-11-16 | Hill-Rom Services, Inc. | Obstruction detection apparatus for a bed |
US6518520B2 (en) * | 2000-03-30 | 2003-02-11 | Mobility Innovations, Inc. | Apparatus and method for weighing the occupant of a bed |
US10353856B2 (en) | 2011-03-17 | 2019-07-16 | Carefusion 303, Inc. | Scalable communication system |
US20040124017A1 (en) * | 2001-03-30 | 2004-07-01 | Jones David Lane | Apparatus and method for weighing the occupant of a bed |
US20050011681A1 (en) * | 2003-07-16 | 2005-01-20 | Follonier Stephane Andre | Flexible weighing device |
WO2005059486A1 (en) * | 2003-12-12 | 2005-06-30 | Hill-Rom Services, Inc. | Seat force sensor |
US7253366B2 (en) * | 2004-08-09 | 2007-08-07 | Hill-Rom Services, Inc. | Exit alarm for a hospital bed triggered by individual load cell weight readings exceeding a predetermined threshold |
US7282654B2 (en) * | 2005-06-08 | 2007-10-16 | Peter Salgo | Patient weighing system |
US8015972B2 (en) | 2006-01-03 | 2011-09-13 | Shahzad Pirzada | System, device and process for remotely controlling a medical device |
US7849545B2 (en) * | 2006-11-14 | 2010-12-14 | Hill-Rom Industries Sa | Control system for hospital bed mattress |
US20090099480A1 (en) * | 2007-05-24 | 2009-04-16 | Peter Salgo | System and method for patient monitoring |
US8533879B1 (en) | 2008-03-15 | 2013-09-17 | Stryker Corporation | Adaptive cushion method and apparatus for minimizing force concentrations on a human body |
US8161826B1 (en) | 2009-03-05 | 2012-04-24 | Stryker Corporation | Elastically stretchable fabric force sensor arrays and methods of making |
US20140353049A1 (en) * | 2012-03-11 | 2014-12-04 | Monique S. Vidal | Digital Scale to Measure Human Weight and to Determine and Display Suitable Dosage of a Medicament |
US8822847B2 (en) * | 2012-03-11 | 2014-09-02 | Monique S. Vidal | Digital scale able to measure human weight and determine suitable dosage of a medicament |
US8904876B2 (en) | 2012-09-29 | 2014-12-09 | Stryker Corporation | Flexible piezocapacitive and piezoresistive force and pressure sensors |
US8997588B2 (en) | 2012-09-29 | 2015-04-07 | Stryker Corporation | Force detecting mat with multiple sensor types |
AU2014241019A1 (en) * | 2013-03-13 | 2015-09-03 | Carefusion 303, Inc. | Patient-specific medication management system |
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Cited By (9)
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US8090478B2 (en) | 2005-06-10 | 2012-01-03 | Hill-Rom Services, Inc. | Control for pressurized bladder in a patient support apparatus |
US8620477B2 (en) | 2005-06-10 | 2013-12-31 | Hill-Rom Services, Inc. | Control for pressurized bladder in a patient support apparatus |
US9107511B2 (en) | 2005-06-10 | 2015-08-18 | Hill-Rom Services, Inc. | Control for pressurized bladder in a patient support apparatus |
US20070261894A1 (en) * | 2006-05-11 | 2007-11-15 | Loadstar Sensors, Inc. | Capacitive force-measuring device based load sensing platform |
US7897884B2 (en) * | 2006-05-11 | 2011-03-01 | Ypoint Capital, Inc. | Method and system of a multi-zone capacitive force-measuring based load sensing platform |
US8717181B2 (en) | 2010-07-29 | 2014-05-06 | Hill-Rom Services, Inc. | Bed exit alert silence with automatic re-enable |
US10292605B2 (en) | 2012-11-15 | 2019-05-21 | Hill-Rom Services, Inc. | Bed load cell based physiological sensing systems and methods |
US9875633B2 (en) | 2014-09-11 | 2018-01-23 | Hill-Rom Sas | Patient support apparatus |
US10276021B2 (en) | 2014-09-11 | 2019-04-30 | Hill-Rom Sas | Patient support apparatus having articulated mattress support deck with load sensors |
Also Published As
Publication number | Publication date |
---|---|
US6396004B2 (en) | 2002-05-28 |
US6180893B1 (en) | 2001-01-30 |
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