Source: https://patents.google.com/patent/US4934468?oq=5072412
Timestamp: 2018-06-23 10:45:02
Document Index: 593182378

Matched Legal Cases: ['arts 10', 'arts 10', 'arts 10', 'arts 10', 'arts 10', 'arts 10']

US4934468A - Hospital bed for weighing patients - Google Patents
US4934468A
US4934468A US07367006 US36700689A US4934468A US 4934468 A US4934468 A US 4934468A US 07367006 US07367006 US 07367006 US 36700689 A US36700689 A US 36700689A US 4934468 A US4934468 A US 4934468A
US07367006
This is a continuation, of application Ser. No. 07/138,829, filed Dec. 28, 1987.
This invention relates to a hospital bed, and more particularly, to a hospital bed having the capability of measuring and maintaining a record of a patient't weight as well as changes in the patient's weight.
The bed of the present invention has its principal use in intensive care or critical care units of a hospital. There, it is necessary to monitor vital functions of a patient on a regular basis. Some must be monitored continuously. One of the vital functions that must be measured on a regular basis is the patient's weight.
It is known that Stryker Corp. of Kalamazoo, Michigan is marketing a bed having a weight monitoring capability, but not much is known about how the weighing is accomplished. The literature indicates that there are provisions for changing tare to accommodate things added or taken from the bed. Aside from the background art heretofore disclosed, there is little art relating to weigh beds.
The bed has a base frame 10 that is supported on casters 11. Bosses 12 fixed to the base frame pivotally support the ends of a cantilevered support arm 13 and a stabilizer arm 14. The ends of the cantilevered support arms 13 and the stabilizer arm 14 are pivotally connected to a bracket 15, thereby providing a parallelogram linkage support for the bed. The bracket 15 is bolted to support frame 16. A piston and cylinder 20 driving a piston rod 21 is mounted on the base frame 10 with the piston rod 21 being connected to the support arm 13 by means of a clevis mount 22. Actuation of the piston and cylinder 20 causes the piston rod 21 to extend and contract, thereby raising and lowering the parallelogram linkage and the support frame 16 of the bed.
The bed as thus described will be outfitted with a mattress, sheets, pillows, blankets, and the like. These items become part of the tare. When these are varied, as by adding a blanket or removing pillow, the tare can be changed, whether the weight of the items be known or unknown, by following an easy sequence of steps on the control/readout unit 60. Further, an attendant can set the controls to provide an alarm, visual or audible, to warn an attendant that the patient has lost or gained weight beyond predetermined limit, or that the patient has left the bed. Since I.V. bags and drainage bags are supported on the support frame 16 and/or bracket 15 and are thus out of the weighing system, losses from the I.V. bags and gains in the drainage bag do not influence the determination of the patient's true weight.
READ Initiates 5 to 8 sec weight measurement upon release. Causes display "+" and preset units, either LB or KG, as previously set, to blink upon closure and while measurement is in process. Signals measurement display with a chime.
UNITS Always comes up in previously set units. Alternately displays in LB or KG upon contact closure. Freezes display when activated and held during weight display. Resets 10 sec. display-hold-timer upon contact opening.
ZERO *Initiates automatic zero-tare of empty bed when held while touching READ. *Activates digit stepping keys for entry of known tare change, plus or minus, when held. *Increments total tare value by difference between display and memory, when activated and held during display while then touching READ. Recalls total system tare value when activated and held; displays for 10 sec after release, or until cancelled by READ or SET. *All tare operations are protected from accidental change by dual-key or sequenced operation.
SET Activates display when held, to show existing alarm weight value for monitoring modes. Activates digit stepping keys when held, to allow setting or changing existing alarm weight value. Facilitates MODE and ALARM setup when held, by activating display when display is otherwise inactive. Releasing SET causes display to clear. Provide memory recall of last weight when held while activating READ.
MODE/OFF Selects monitoring mode, shown in display, and as described:
EXIT: Rough weight measurement (+0, -10% accuracy) taken every 3 to 4 seconds. Places EXIT alarm if weight falls below existing alarm-weight value for two successive readings.
Sequences through available settings in rotation with each touch, or rolls at a 1/2 sec. rate if held for 1 sec. Skips settings that are not available due to hard-wire inhibit or programmed inhibit. Settable any time a full display is present, that is, during weight display holding time, during total tare display holding time, or any time SET is held activated.
Audio tone for EXIT is 400 Hz gated ON for 1/2 sec., OFF for 1/2 sec., for WT+ and WT-, a 400 Hz tone gated ON for 1/2 sec., OFF for 11/2 sec. The LED and DISPLAY flash at the same ON/OFF rate as the audio.
__________________________________________________________________________                             "M/A and "U" designate "MODE, ALARMPROCEDURE   STAFF ACTION   DISPLAY                             and UNITS"__________________________________________________________________________ZERO EMPTY BED       HOLD ZERO      M/A U  TOTAL SYSTEM TARE, INITIAL                      +T.SY.T.sub.i                             (T.SY.T..sub.i) is displayed as long                             as                             ZERO is held.       TOUCH READ     M/A U  Display changes to Zero to indicate                      +000.0 procedure when READ closes with                             ZERO held.       RELEASE ZERO   +000.0 U                             Display blinks during 5-8 sec. zero                             tare measurement. Blinking and                             measurement start upon release of                             ZERO.                      CHIME  CHIME signals completion of tare                             measurement.                      M/A U  TOTAL SYSTEM TARE, FINAL                             (T.SY.T..sub.f)                      +T.SY.T..sub.f                             to Zero bed, is stored in memory.                      HOLDS                      10 sec.                             DISPLAY holds 10 sec. or until                             cancelled by SET or READ.                             UNITS change converts display on                             closure; restarts 10 sec. timer on                             release.                             MODE and ALARM may be set during                             display.READ SYSTEM TOUCH ZERO     M/A U  TOTAL SYSTEM TARE is displayed uponTARE                       +T.SY.T.                             ZERO closure and holds for 10 sec.                      HOLDS 10                             after release, or until cancelled                      Sec.   by READ or SET.                             UNITS change converts display on                             closure; restarts 10 sec. timer on                             release.                             MODE and ALARM may be set during                             display.INPUT KNOWN HOLD ZERO      M/A U  TOTAL SYSTEM TARE, INITIAL isTARE                       +T.SY.T..sub.i                             displayed upon ZERO closure.       CHECK UNITS           DISPLAY converts if UNITS are                             changed.       INPUT EXACT TARE                      M/A U  DISPLAY numerals clear with first       CHANGE         ±ΔT                             key entry to show ΔT input.       DIGIT STEPPING        DISPLAY increments with each key       KEYS ADDED (+)        touch; rolls upward at 1/2 sec. per       OR REMOVED (-)        step without decade carryover if                             digit stepping key is held for 1                             sec. Hundreds digit rolls +0, +1,                             +2, + 3, +4, -4, -3, -2, -1, -0,                             etc.       RELEASE ZERO   M/A U  TOTAL SYSTEM TARE, FINAL (I.SY.T..sub.f                             =                      +T.SY.T..sub.f                             T.SY.T.sub.i + ΔT), which                             includes the                             known tare change, ±ΔT, is                             displayed 10 sec. after release, or                             until cancelled by READ or SET.                             UNITS change converts display on                             closure; restarts 10 sec. timer on                             release.                             MODE and ALARM may be set during                             display.INPUT UNKNOWN       TOUCH READ, (OR USE                      + U    Display blinks during 5 to 8 sec.TARE        VALUE IN MEMORY       weight measurement. Blink starts       WITHOUT NECESSITY     with READ closure; measurement,       OF RECALL)            upon release.                      CHIME  CHIME signals completion of PATIENT                             WEIGHT measurement.                      M/A U  PATIENT WEIGHT is displayed for 10                      +P.W.  secs. or until cancelled by READ or                      HOLDS  SET, at which time it bumps into                      10 Sec.                             memory.                             UNITS change converts display on                             closure; restarts 10 sec. timer on                             release.                             MODE and ALARM may be set during                             display.       CHANGE BED TARE       Time to complete equipment or bed                             change is not critical.       TOUCH READ     + U    Display blinks during 5 to 8 sec.                             weight measurement. Blink starts                             with READ closure; measurement,                             upon release.                      CHIME  CHIME signals completion of PATIENT                             PLUS UNKNOWN TARE WEIGHT measure-                             ment.                      M/A U  PATIENT PLUS UNKNOWN TARE is dis-                      +P + ΔT                             played for 10 sec., or until                             cancelled by READ or SET.                      HOLDS 10                             UNITS may still be changed, con-                      Sec.   verting display on closure, re-                             starting 10 sec. timer on release.                             MODE and ALARM may be set during                             display without having an effect on                             the procedure.       DURING DISPLAY M/A U  DISPLAY converts upon closure, to       HOLD ZERO      +P.W.  initial PATIENT WEIGHT from memory.       TOUCH READ            TARE increment, ΔT = (P +                             ΔT) -                             (P.W.), is added to TOTAL SYSTEM                             TARE and displayed upon closure of                             READ       RELEASE ZERO   M/A U  ADJUSTED TOTAL SYSTEM TARE, includ-                      +T.SY.T..sub.f                             ing tare change ΔT, is displayed                             10                      HOLDS 10                             sec. after release, or until                      Sec.   cancelled by READ or SET.                             UNITS change converts display on                             closure; restarts 10 sec. timer on                             release.                             MODE and ALARM may be set during                             display.WEIGH PATIENT       TOUCH READ     + U    DISPLAY blinks "+" and "KG" or                             "LB", as previously set, during 5                             to 8 sec. weight measurement.                             Blink starts with READ closure;                             measurement, upon release.                      CHIME  CHIME signals completion of PATIENT                             WEIGHT measurement.                      M/A U  PATIENT WEIGHT is displayed for 10                      +P.W.  sec., or until cancelled by READ or                      HOLDS 10                             SET, at which time it bumps into                      Sec.   memory.       TOUCH UNITS    RESTARTS                             UNITS change converts display on                      10 Sec.                             closure; restarts 10 sec. timer on                             release.                             MODE and ALARM may be set during                             display.HOLD DISPLAY       HOLD UNITS     M/A U  Units system will change with first                      +P.W.  touch; change back with second       RELEASE UNITS  HOLDS 10                             operation; will hold indefinitely                      Sec.   if switch is held activated.                             DISPLAY holds 10 sec. after re-                             lease, or until cancelled by READ                             or SET.MEMORY RECALL       HOLD SET       M/A U  Existing alarm weight value is                      ±AL'M.WT                             displayed including ALARM and MODE                             status and weight UNITS.                             DISPLAY converts if UNITS are                             changed.       ACTIVATE READ  M/A U  DISPLAY converts upon closure, to                      +P.W.  last value of weight bumped into                             memory during weight measurement                             or automatic monitoring mode                             (WT+ or WT-)       RELEASE READ   M/A U  DISPLAY converts back to existing                      ±AL'M WT                             alarm weight value.       RELEASE SET           DISPLAY disappears instantly;                             weighing cycle is not initiated.MONITORING  HOLD SET       M/A U  Existing alarm weight value is dis-SETUP                      ±AL'M WT                             played, including ALARM and MODE                             status and weight UNITS       SET MODE: EXIT M/A U  MODE setting steps sequentially       WT-, WT+, or OFF                      ±AL'M WT                             with each touch of the key,                             whenever display is present, or                             will roll at 1/2 sec. per step if                             held for 1 sec.       SET ALARM: SILENT                      M/A U  ALARM setting steps sequentially       LOCAL, or REMOTE                      ±AL'M WT                             with each touch of the key,                             whenever display is present, or                             will roll at 1/2 sec. per step if                             held for 1 sec.       CHECK UNITS    M/A U  DISPLAY converts if units are                      ±AL'M WT                             changed.       ENTER ALARM WEIGHT                      M/A U  DISPLAY increments with each key                      ±AL'M WT                             touch; rolls upward at 1/2 sec. per                             step without decade carryover if                             digit stepping key is held for 1                             sec.                             Hundreds digit rolls +0, +1, +2,                             +3, +4, -4, -3, -2, -1, -0, +0 etc.(RECALL MEMORY       ACTIVATE READ  M/A U  DISPLAY converts upon closure, toDURING SETUP)              +P.W.  last value of weight bumped into                             memory during weight measurement                             or automatic monitoring mode (WT-                             or WT+)       RELEASE READ   M/A U  DISPLAY converts, upon release,                      ±AL'M WT                             back to ALARM WEIGHT value       RELEASE SET           After MODE, ALARM, and ALARM WEIGHT                             settings have been completed (in                             any sequence), releasing SET blanks                             DISPLAY instantly.RECALL ALARM WT       HOLD SET       M/A U  Existing ALARM WEIGHT value is dis-                      ±AL'M WT                             played, including ALARM and MODE                             status and preset weight UNITS.       RELEASE SET           DISPLAY blanks instantly.SHUT OFF ALARM       TOUCH MODE     M      MODE setting blinks in display                             when alarm occurs; alarm clears                             with single touch of MODE key. To                             reset, condition must be cleared                             and MODE reset as above.__________________________________________________________________________
1. In a hospital bed having a weigh frame supported by at least one load cell on a support frame, a control/readout apparatus connected to said load cell comprising:
a display for weigh data,
control means including keys for entering weigh units connected between said load cell and said display,
said control means for entering and displaying tare weight and changing tare when an unknown change in tare occurs, and for displaying the patient's weight, and
means for initiating an alarm at a central station when a patient leaves said bed.
2. In a hospital bed having a weigh frame supported by at least one load cell on a support frame, a control/readout apparatus connected to said load cell comprising:
said control means for entering and displaying tare weight and changing tare when an unknown change in tare occurs, and for displaying the patient's weight,
a SET switch for activating said display to show alarm weight and to activate keys for setting or changing existing alarm weight value,
and a MODE switch for sequencing said control means through "exit" weight, "over" weight, and "under" weight,
and an alarm that is activated when any of said preset mode conditions occur.
3. In a hospital bed having a weigh frame supported by at least one load cell on a support frame, a control/readout apparatus connected to said load cell comprising:
means for initiating an alarm at a central station when a patient leaves said bed,
an ALARM switch for programming the following alarm types:
Silent: flashing LED on readout unit
Local: flashing LED plus audio beep on readout unit
Remote: audio beep transmitted to central station.
4. In a weigh apparatus having a weigh frame supported by at least one load cell on a support frame, a control/readout apparatus operatively connected to said load cell and comprising:
said control means for entering and displaying tare weight and changing tare when an unknown change in tare occurs,
and for displaying the weight of a load supported by said weigh frame, and
means for initiating an alarm at a central station when a load is removed from said weigh frame.
5. In a weigh apparatus having a weigh frame supported by at least one load cell on a support frame, a control/readout apparatus operatively connected to said load cell and comprising:
and for displaying the weight of a load supported by said weigh frame,
a MODE switch for sequencing said control means through "exit" weight, "over" weight, and "under" weight,
6. In a weigh apparatus having a weigh frame supported by at least one load cell on a support frame, a control/readout apparatus operatively connected to said load cell and comprising:
means for initiating an alarm at a central station when a load is removed from said weigh frame, and
US07367006 1987-12-28 1989-06-16 Hospital bed for weighing patients Expired - Lifetime US4934468A (en)
US07138829 Continuation US4953244A (en) 1987-12-28 1987-12-28 Hospital bed for weighing patients
US4934468A true US4934468A (en) 1990-06-19
ID=26836586
US07367006 Expired - Lifetime US4934468A (en) 1987-12-28 1989-06-16 Hospital bed for weighing patients
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