US3893453A - Compressed data display system - Google Patents

Compressed data display system Download PDF

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Publication number
US3893453A
US3893453A US441684A US44168474A US3893453A US 3893453 A US3893453 A US 3893453A US 441684 A US441684 A US 441684A US 44168474 A US44168474 A US 44168474A US 3893453 A US3893453 A US 3893453A
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Prior art keywords
pen
recited
paper
electro
cylinder
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US441684A
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English (en)
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Herbert E Goldberg
Robert L Cannon
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Warner Lambert Co LLC
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American Optical Corp
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Priority to US441684A priority Critical patent/US3893453A/en
Priority to IL46481A priority patent/IL46481A/en
Priority to CA218,702A priority patent/CA1047115A/fr
Priority to DE19752503822 priority patent/DE2503822A1/de
Priority to FR7503838A priority patent/FR2260320B1/fr
Priority to JP50016402A priority patent/JPS50114085A/ja
Priority to SE7501435A priority patent/SE7501435L/xx
Priority to NL7501596A priority patent/NL7501596A/xx
Priority to GB5802/75A priority patent/GB1499516A/en
Priority to US05/565,306 priority patent/US3951135A/en
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Publication of US3893453A publication Critical patent/US3893453A/en
Priority to CA236,479A priority patent/CA1047116A/fr
Assigned to WARNER LAMBERT COMPANY A CORP. OF DE reassignment WARNER LAMBERT COMPANY A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN OPTICAL CORPORATION A CORP. OF DE
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A61B5/333—Recording apparatus specially adapted therefor
    • A61B5/338—Recording by printing on paper
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A61B5/333—Recording apparatus specially adapted therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7232—Signal processing specially adapted for physiological signals or for diagnostic purposes involving compression of the physiological signal, e.g. to extend the signal recording period

Definitions

  • ABSTRACT Filed 111 A compressed data display system. There is disclosed 21 A-ppl. No.: 441,684
  • the EKG waveform is recorded on looped paper supported by and/or wrapped around rotatable drum or drums which may have cylindrical shape.
  • the EKG is recorded in helical or spiral fashion by simultaneously rotating the drum and transversely moving a galvanometer pen in the di- [56] References Cited rection of the axis of rotation of the drum or cylinder.
  • OPT/C3 101 I03 ,107 I l 1 1 l r' ECG 94 E a LY/WW1! mtvnwonertn no cI/nRrPaPt-R PATIENT RMPLIFIER 1 DR'VER Perv nun on t r 20,1155 c E TiLECTRO/VICS CARRAGE mum H 106 r l 126 GEHR TRAIN POWER 1 HEART RATE SUPPLY 3 Z svncn RONOUS 1.24 MOTOR /129 1 1:10
  • the present invention relates generally to the field of medical electronics. More specifically, the present invention relates to means for monitoring and displaying vital signs including EKG ofa patient in a line-over-line compressed-data manner which facilitates analysis.
  • EKG strips are taken by a physician by attaching leads or conductors to the body of a patient (generally three leads). Electrical signal activity generated by the patients heart is sensed by these conductors or sensors. These electrical signals are extended to EKG and amplifiers and eventually to galvanometer pens for scribing on the surface of a paper.
  • the paper is generally spool-wound chart paper and advanced in a continuous manner, the direction of advance of paper being the direction of a time axis. Deflections of the galvanometer pen are generally perpendicular or transverse to direction of motion of the paper. The resultant trace, if the EKG is taken for any appreciable length of time, is very long.
  • the present invention is a solution to the prior art problem of recording and displaying large quantities of vital sign data and particularly the EKG ofa patient. It provides an automatic line-over-line compression of data in a compact and easily usable form and thus facilitates analysis.
  • the present invention relates to recording of vital sign data on a paper or chart paper wrapped around a cylindrical drum or drums.
  • the galvanometer pen is translated in a direction transverse to direction of movement of the chart paper.
  • the chart paper direction is one time axis, and the direction of motion of the galvanometer pen is a second quantized time axis.
  • Continuous transverse motion of the galvanometer pen permits scribing a helix on the surface of the cylinders chart paper. Deflections due to the EKG signal are in directions also transverse to direction of chart paper motion.
  • the display system includes EKG sensing and amplifying means, a rotatably mounted cylinder, closed loop chart paper fitted to the cylinder, and a transversely movable galvanometer pen assembly for scribing on the paper in the manner described above.
  • Another feature of the present invention includes circuitry for providing a dithering mark at selected portions of the recorded data either upon manual command or automatically to indicate the average rate of heartbeat for a given portion of EKG data.
  • An advantage of the present invention is that it compresses vital sign data, from a long paper trace readout into a single sheet line-over-line vital sign picture thereby facilitating analysis. It is thus advantageous to patient and physician alike.
  • FIG. 1 depicts a block diagram of an illustrative embodiment of the present invention
  • FIG. 2 depicts certain detail of the block diagram of FIG. 1;
  • FIG. 3 depicts a perspective view of certain mechanical detail of the illustrative embodiment of the present invention
  • FIG. 4 depicts another perspective view of other certain mechanical aspects of the illustrative embodiment of the present invention.
  • FIG. 5 depicts the resultant chart paper compressed data display generated by the present invention.
  • EKG amplifier electronics 103 EKG amplifier electronics 103.
  • ECG amplifier electronics 103 EKG amplifier electronics
  • ECG amplifier electronics 103 output from ECG amplifier electronics 103 is extended on conductor to heart rate module 117.
  • ECG amplifier electronics 103 is extended on conductor to heart rate module 117.
  • ECG switch 105 output from heart rate module 117 is extended to selector switch 105 on conductor 137.
  • Output from selector switch 105 is provided on conductor 106 to galvanometer drive electronics I07.
  • Output from electronics 107 is extended on conductor 108 to galvanometer pen and carriage assembly 109. Scribing output from carriage assembly 109 is provided to chart paper on drum 111 via input (pen) 110. This is the basic sensing, amplifying, monitoring, and recording (and/or displaying) functional chain.
  • Synchronous motor 129 provides rotational mechanical output 128 to gear train which, in turn, provides rotational outputs I26 and 127 to assembly 109 and drum 111, respectively.
  • Synchronous motor I29 is supplied by AC line power 131 through speed control on conductor 130.
  • AC line power 131 likewise provides power inputs to power supply 119 on conductor I32, and to dither circuitry 134 on conductor 133.
  • Power supply 119 is a DC power supply, and supplies DC voltage to dither circuitry 134 over conductor I24,
  • heart rate module 117 over conductor 123 selector switch 105 over conductor 122, electronics 107 over conductor 121, amplifier electronics 103 over conductor 120, and speed control 150 over conductor 151.
  • a rotational position input 112 is provided from cylindrical drum 111 to electro-optics 113.
  • the output from electro-optics 113 is provided to selector switch 105 on conductor 114.
  • a manual input 116 in the form of a pushbutton switch (not shown) or other switch, is provided to selector switch 105.
  • Electro-optics assembly 113 located in general at the periphery of the cylinder, provides input 114 through selector switch 105.
  • selector switch 105 In FIG. 2, phantom line 105 represents the outline of selector switch 105 as shown in FIG. 1.
  • Input 114 is provided to reset circuitry 213, output thereof being extended on conductor 210 to digital counter 204.
  • the other input to counter 204 is provided on conductor 203 from clock 202.
  • Counter 204 provides an output on conductor 205 to ramp generator 206. Output from ramp generator 206 is extended on conductor 207 to one input of comparator 208.
  • comparator 208 The other input of comparator 208 is provided by heart rate module 117 on conductor 137. Output from comparator 208 is extended on conductor 209 as an input to mono-stable circuitry 214. Another input to mono-stable circuitry 214 is manual input 116. Output from mono-stable circuitry 214 is provided to solid state switch 212 on conductor 211. Other inputs to solid state switch 212 include inputs on conductors 135, and 104. Output from solid state switch 212 is extended on conductor 106 to galvanometer drive electronics 107 as indicated in FIG. 1.
  • FIG. 3 depicts cylinder or writing surface 200 with slit 201, the writing surface rotatably mounted about a substantially vertical axis 350.
  • Writing surface 200 can have cylindrical, conical, or other shape.
  • Writing surface 200 is intended to be adapted for magnetic drum recording as well as paper displays. This axis need not be vertical; however, for purposes of clarity of illustration it is herein thus depicted.
  • Axis 350 is shown rotatably mounted to base or chassis 400 in FIG. 4.
  • Galvanometer pen 300 is arranged to scribe on the surface of cylinder or drum 200.
  • chartpaper or paper 351 (partially indicated for purposes of clarity of illustration) wrapped around and fastened in slit 201. It is to be understood that paper 351 extends the entire substantial length of cylinder or drum 200 and essentially wraps around and covers the surface area of the drum.
  • Pen 300 scribes or writes on paper 351.
  • Lead screw 302 is shown substantially parallel to axis 350 and is likewise rotatably mounted to chassis 400.
  • Rod 303 is fixedly mounted parallel to lead screw 302. Sliding on rod 303 is slidably mounted carriage 304 which, in turn, supports galvanometer 301.
  • Galvanometer 301 receives an electrical signal input on conductor wires (not shown in FIGS. 3, 4) which signals are transduced into mechanical motion of pen 300.
  • Motor 305 (depicted in FIG. 1 as 129) provides rotational output to gear train 307 (depicted in FIG. 1 as 125).
  • the gear train provides rotational motion 250 to cylinder 200 about axis 350, and provides rotational motion to lead screw 302 about its longitudinal axis.
  • Carriage 304 is threadingly engaged with threads of lead screw 302.
  • rotational motion of lead screw 302 provides translational motion of carriage 304 in a direction substantially parallel to axis 350.
  • Gears of gear train 307 are designed to provide a plurality of rotations of drum 200 corresponding to a single motion in a translational manner from the top of drum 350 (an initial position) to the bottom 'of drum 350 (a final position).
  • gear train 307 need not have the specific arrangement depicted in FIG. 3.
  • chassis 304 When chassis 304 reaches final position, it makes physical contact and operates micro-switch 306.
  • the micro-switch is electrically connected between power 131 and motor 305, and operation of the microswitch disconnects power to the motor thereby stopping the rotational and translational motions of the system.
  • carriage disengagement means (not shown) for rapid return of the galvanometer to the initial position, not causing the drum to rotate.
  • electro-optics 113 was depicted as being functionally connected between the drum and the selector switch 105.
  • the electro-optics which is comprised of phototransistors and photodiodes, commercially available, are mounted as shown.
  • Electro-optic elements 113a and 113b are approximately displaced on the periphery of one end of drum 200. These electro-optical elements rotate with the rotating drum.
  • Mounted on base or chassis 400 is a fixed electro-optic sensor 1l3c. As the rotatable electro-optical elements 113a and 11311 in turn pass adjacent electro-optical element 113e, optical communication is achieved there between. The purposes of these optical elements will be discussed more fully below.
  • Slit 201 is shown in FIGS. 2,3, and 4. Chart paper having fixed length and having substantially parallel edges may be wrapped around drum 200. Edges of paper 351 are inserted into slit 201 and are fastened therein by rotatable clamping control 352.
  • EKG or other vital sign
  • the EKG signal of patient 101 is amplified in electronics 103, extended to selector switch 105, extended to galvanometer driver electronics 107 which drives galvanometer pen means 301 which in turn causes pen 300 to scribe on paper 351 supported on cylinder 200. While this signal is being applied to pen 300 and while scribing motion is taking place, cylinder or drum 200 rotates in direction 250. Simultaneously carriage 304 translated in a downward vertical direction. This combined rotational and translational motion creates a helical base line on paper 351. (It is intended herein that the words helix, spiral and coil" can be used interchangeably.) The result can be seen in FIG. 5.
  • paper 500 (which is shown partially as paper 351 in FIG. 3) is depicted as having usable display length 511 which corresponds tothe circumference of drum 200. Dotted lines 501 indicate where folds of the paper are made for insertion of these folds into slit 201 as described earlier. Paper 500 is shown in a broken diagrammatic fashion for purposes of clarity of illustration. A time scale of zero through sixty seconds is provided and break 504 in the paper takes place at approximately between 23 seconds and 53 seconds.
  • the scribing of pen 300 on paper 500 provides EKG wave forms 502. As intended to be depicted by lines 508, 509, 512, and 513, the entire surface of the page can be scribed with EKG signals. As noted earlier, the base line scribed on the surface of paper 500 when mounted on drum 200 would be a helix or spiral. When the paper is removed from slit 201 and opened flat, straight lines with a slightly downward slope are observed. Thus, data line 2 identified by numeral 2 at the left-hand edge of the useable display paper. corresponds in time to the end of data line 1 identified as 2' at the right-hand data edge of the paper.
  • lines of EKG data are identified by numerals 1,2,3, and 4 .n, and the end of each line corresponds in time to the beginning of the next successive line.
  • the point marked 2 corresponds in time to the end of line 1 and the beginning of line 2.
  • the designation "n indicates that there are an extensive plurality of data lines obtained and limited only by size of paper and drum.
  • the preferred embodiments are designed to provide 60 seconds of data per line with 30 lines per sheet thereby displaying a half hour of electrical heart activity and to provide four minutes per line with 30 lines per sheet thus providing a two hour dis-
  • Reference numeral 510 depicts a selectable period of time during which heart rate is averaged in heart rate module 117 comprised of standard circuitry. Module 117 is triggered by each EKG wave to provide a constant width and constant amplitude pulse output in response thereto. This pulse train is then averaged on capacitor circuitry or other means to provide a DC level corresponding to average heart rate.
  • heart rate module 117 provides this DC voltage to comparator 208.
  • Digital counter 204 is reset by a signal coming from optics 113 when pen 300 is positioned at slit 201 as will be fully explained below. This is the zero or reset setting for the scribing motion.
  • Digital counter 204 is stepped by clock generator 202 once each second.
  • Clock generator 202 is synced to 60 hertz power 131.
  • ramp generator 206 is energized.
  • Counter 204 is constructed from standard digital circuitry and may be a ring counter.
  • Ramp generator 206 is likewise constructed from standard circuitry for charging a capacitor in a linear fashion.
  • ramp generator 206 is energized after about 56 seconds and this energization takes place at line 520 on FIG. 5.
  • Comparator 208 compares the two inputs and at coincidence between ramp generator voltage and DC voltage on conductor 137, the comparator output is extended on conductor 209 to monostable 214. Comparator 208 is likewise standard operational amplifier circuitry. Omission of detailed discussion of the circuit elements in these standard circuits does not inhibit full understanding of the present invention.
  • dither generator 134 is powered by AC line power 131 and is a conduit for 60 hertz power at a substantially reduced power value.
  • This 60 cycle/second signal is provided on conductor 135 in FIG. 2, to solid state switch 212.
  • Operation of monostable 214 causes connection of the dithering signal on conductor 135 to output conductor 106.
  • Solid state switch 212 is comprised of standard transistor switching circuitry and omission of detailed description does not detract from complete understanding of the present invention.
  • the average DC voltage generated byv heart rate module 117 corresponds to rate scale 506 inv FIG. 5 and thus, dithering mark 505 is indicated to be approximately 60 beats per minute.
  • solid state switch 212 After a predetermined period of time determined by time constants of monostable 214, solid state switch 212 returns to its prior connection of conductors 104 and 106, thereby reconnecting the EKG signal to pen 300.
  • Mark 505 indicates average heartbeat rate for time period 510 of line 1. Accordingly, a dithering rate mark is provided in the other lines of data. This is very useful information since it provides at a glance a histogram effect of heartbeat rate change of the patient over a long period of time.
  • Numeral 503a and 503b refer to ectopic beats, which are clearly visible in this display.
  • Another module which detects ventricular premature beats (a form of ectopic beats) can be connected between conductor 1 15 and selector switch 105 in a manner similar to connection of module 117.
  • a premature ventricular contraction detector is disclosed in US. Pat. No. 3,616,790 entitled MULTIFORM VENTRICULAR PREMATURE BEAT DETECTOR issued on Nov. 2, 1971 in the name of G. J. Harris and assigned to Americal Optical Corporation, the Assignee of the present invention. Background information disclosed in this patent is incorporated herein by reference.
  • circuitry disclosed in this patent can be used with other circuitry to provide a DC voltage corresponding to the number of PVC's per data line.
  • a separate histogram can be displayed at a different location on the paper having a different scale for indicating the number of occurrences of premature ventricular beats.
  • direction 522 represents direction of translational motion of carriage 304.
  • Numerical designation 507 represents cross hatching which may be spread throughout the page in a uniform manner as depicted. It is illustrated only in a portion of sheet 500 for the purpose of clarity of illustration.
  • FIG. 1 and FIG. 2 indicate manual input 116 to selector switch 105 and more specifically to monostable circuitry 214.
  • This utilizes a push-button or other manual switch arrangement whereby the physician or operator of the system can mark at will on sheet 500, a dither signal such as mark 521.
  • output 211 from monostable 214 causes solid state switch to make a connection between conductors and 106.
  • Dither generator 134 provides a 60 cycle dithering signal to conductor 106 and thus to pen 300 which scribes in a dithering or vibrating manner on chart paper 500.
  • Dither mark 521 is displayed at this point in FIG. 5 for a special reason. It marks the occurrence of a significant event such as patient complaints of discomfort, or infusion of a drug. or the beginning of exercise testing, etc.
  • a feature of the present invention is a speed-up switch as shown in FIG. 1.
  • This speed-up push-button switch which is designated on the chassis of the preferred embodiments as reset.” increases the speed of the synchronous motor 129 thereby operating gear train 125 more rapidly.
  • the galvanometer pen is translated to position 3' in a time which is equal to or less than the time between the last heartbeat and the next heartbeat.
  • the speed control 150 is returned to its standard speed arrangement.
  • Speed control 150 is a device which changes current flow to motor 129 (305).
  • the same display method can be utilized with other tests such as drug testing. If the patient is given certain drugs for medical reasons, the speed control can be operated to reset" the display, where the heartbeats begin from the left-hand side of the paper as described above.
  • Manual means 116 may also be operated to create designation 521 indicating the beginning of the increased heart rate.
  • Optical pick-ups 1130, 113b, and l 130 are utilized in the operation of speed control 150 as well as in other features of the present invention.
  • Speed control 150 is made to return to its original state when optical pickup ll3b is in optical communication with pick-up l 130.
  • galvanometer pen 300 is positioned at slit 201.
  • a signal from optical pick-up 1130 causes the switch in speed control 150 to return to its original state.
  • the optical pick-ups function in at least two modes.
  • the first mode was described above.
  • speed control 150 is operated and causes drum 200 to move rapidly until optical pick-up 1 13b is aligned with optical pick-up 113e, (thus causing pen 300 to line up with slit 201).
  • speed control 150 again increases speed of motor 129, thereby increasing speeds of rotation and translation of the system components.
  • optical pick-up 1130 is in optical communication with 113e, all motion of the system is stopped.
  • Control 150 disconnects motor I29 from AC power line 131.
  • This load button is depressed when it is desired to have the slit position to the front of the apparatus for easy access regarding loading and unloading of the paper. Depressing the run" button reconnects power to the motor.
  • the invention may be embodied in yet other specific forms without departing from the spirit or essential characteristics thereof.
  • Leads 102 generally are three in number, and each of these leads may be thus monitored.
  • lines 1, 2, and 3 in FIG. 5 could be made to represent the outputs from three leads 102 from patient
  • pitch or relative speed of lead screw 302 must be altered to accommodate this feature. in order for this to work properly, the end of line I would have to correspond to the beginning of line 4, being sufficiently displaced downward so as to not create interference with other lines corresponding to the other two leads.
  • other sensors may be used to sense other vital signs (eg: blood pressure) simultaneously with EKG.
  • An assembly cartridge including drum and paper could be used where one cylinder with paper is removed and another cylinder with paper is installed (where the paper is not a single sheet but is an endless loop or belt of paper).
  • a paper loop of the endless belt variety (not shown), can be used which has a circumference in excess of the circumference of drum 200.
  • the system works well if the scribing point of contact between pen 300 and the surface of the paper 351 on drum 200 remains smooth. Accordingly, even more data can be recorded and displayed.
  • another cylinder (not shown) can be installed at a remote distance, to provide pulley support means for this extended circumference endless paper loop.
  • a particularly advantageous utility of the present invention is in connection with the transcription of EKG cassette tape recorders.
  • portable tape recorders exist which record a patients EKG for long periods of time, 24 hours or more. Playback of 24 hours of EKG data at real time would take thus 24 hours.
  • both the tape recorder and the present inventions speed control can be increased by a factor of 20 or more (with respect to real time).
  • speed control can be increased by a factor of 20 or more (with respect to real time).
  • all of this data can be recorded on a large single sheet of paper in an hour or less.
  • a system for displaying vital signs of a patient comprising: means for sensing said vital signs and for providing analogous electrical signals, means for amplifying said electrical signals, a chassis, means axially-rotatably mounted to said chassis for providing a writing surface, looped paper fitted to and supported by said writing surface means, means supported by said chassis for rotating said writing surface means thereby advancing and recycling said paper, galvanometer pen means for scribing on said paper in scribing directions transverse to the direction of motion of said paper, means connected to said chassis for supporting said pen means and for translationally moving said pen means in one of said scribing directions from an initial position towards a final position, and means for extending said signals to said galvanometer pen means.
  • said writing surface means comprises a cylinder having axially directed slit means in the surface of said cylinder and extending the entire length of said cylinder for receiving two substantially parallel edges of said paper and for clamping said edges to create a smooth overlapping of said paper around said cylinder.
  • a system as recited in claim 4 further comprising two electro-optical devices employed in the control of the operation of at least said rotating means and mounted on the periphery of said cylinder, said two devices being relatively angularly displaced by approximately 90, one of two electro-optical devices being mounted adjacent said slit, and a third electro-optical device mounted on said chassis adjacent said periphery and in substantial alignment with the scribing point between said paper and said pen means and arranged to be in optical communication with each of said two electro-optical devices as each of said two electro-optical devices rotates adjacent said third electro-optical device.
  • a system as recited in claim 5 including means responsive to the optical communication between said third electro-optical device and said other of said two electro-optical devices for controlling speed of said rotating means when said other of said two electrooptical devices is adjacent said third electrooptical device.
  • a system as recited in claim 5 including means responsive to the optical communication between said third electro-optical device and said one of said two electro-optical devices for inhibiting operation of said rotating means and said translationally moving means when said one of said two electro-optical devices is adjacent said third electro-optical device.
  • said cylinder means further comprises two switching devices mounted on the periphery of said cylinder, said two devices being relatively angularly displaced by approximately 90", one of said two switching devices being mounted adjacent said slit, and a third switching device mounted on said chassis adjacent said periphery and in substantial alignment with the scribing point between said paper and said pen means and arranged to be in communication with each of said two switching devices as each of said two switching devices rotates adjacent said third switching device.
  • rotating means comprises an electrical motor and gear train means for connecting the rotational output of said motor to said rotatably mounted cylinder means.
  • said supporting and translationally moving means comprises a rod fixedly supported by said chassis and disposed substantially parallel to the longitudinal axis of said cylinder means, carriage means slidably mounted to said rod for holding said galvanometer pen means, a lead screw rotatably mounted parallel to said rod and engaged with said carriage, and said motor and gear train means including additional means for connecting said rotational output of said motor to said lead screw whereby rotational motion of said lead screw causes translational motion of said carriage.
  • a system as recited in claim 10 comprising a microswitch fixedly attached to said chassis near one end of said rod and arranged to be operated by contact with said carriage means in said final position, and means responsive to operation of said microswitch for disabling said rotating means and said translationally moving means.
  • a system as recited in claim l0 comprising a switch fixedly attached to said chassis near one end of said rod and arranged to be operated by contact with said carriage means in said final position, and means responsive to operation of said switch for disabling said rotating means and said translationally moving means.
  • said sensing means comprises a plurality of patientconnected sensors
  • said galvanometer pen means comprises a plurality of galvanometers, each of said plurality of galvanometers corresponding respectively to one of said plurality of sensors, each of said plurality of galvanometers having a respective pen, and means for extending each of said plurality of sensors to a respective one of said galvanometers.
  • a system as recited in claim 1 further comprising means for generating pen means dithering signals, and manually operated means for momentarily disabling said extending means and for conducting said dithering signals to said pen means, whereby a dither mark is scribed on said paper at will.
  • rotating means includes means to provide a plurality of rotations of said cylinder means to correspond to the translational motion distance of said pen means in moving from said initial position to said final position.
  • a system for displaying vital signs of a patient comprising means for sensing said vital signs and for providing analogous electrical signals, supporting means, a looped markable surface supported by said supporting means, means for advancing and recycling said surface about a first axis, and marking means responsive to said signals for coating said surface with representations of said signals in a helical path about said axis.
  • a system for displaying vital signs of a patient comprising: means for sensing said vital signs and for providing analogous electrical signals, means for amplifying said electrical signals, a chassis, means axially-rotatably mounted to said chassis for providing a writing surface, looped paper fitted to and supported by said writing surface means, means supported by said chassis for rotating said writing surface means thereby advancing and re-cycling said paper, means for establishing a recording rotational speed range, means for controlling said rotating means to operate within said recording rotational speed range, galvanometer pen means for scribing on said paper in scribing directions transverse to the direction of motion of said paper, means for extending said signals to said galvanometer pen means, means connected to said chassis for supporting said pen means and for translationally moving said pen means in one of said scribing directions from an initial position towards a final position, means for establishing a recording translational speed range as a function of said recording rotational speed range to permit said pen means to scribe said looped paper with representations of said
  • said writing surface means comprises a cylinder having axially directed slit means in the surface of said cylinder and extending the entire length of said cylinder for receiving two substantially parallel edges of said paper and for clamping said edges to create a smooth overlapping of said paper around said cylinder.
  • a system as recited in claim 17 further including manually-activated speed-control means for causing said rotating means and said translationally moving means to operate outside of said recording rotational speed range and said recording translational speed range respectively.
  • said speed control means further comprises two electrooptical devices employed in the control of the operation of at least said rotating means and mounted on the periphery of said cylinder, said two devices being relatively angularly displaced by approximately 90, one of said two eIectro-optical devices being mounted adjacent said slit, a third electro-optical device mounted on said chassis adjcent said periphery and in substantial alignment with the scribing point between said paper and said pen means, and means for controlling optical communication between each of said two electrooptical devices as each of said two electro-optical devices rotates adjacent said third electro-optical device.
  • a system as recited in claim 21 including means responsive to the optical communication between said third electro-optical device and said other of said two electro-optical devices for returning speed of said rotating means within said recording rotational speed range when said other of said two electro-optical devices is adjacent said third electro-optical device.
  • a system as recited in claim 21 including means responsive to the optical communication between said third electro-optical device and said one of said two electro-optical devices for inhibiting operation of said rotating means and sand translationally moving means when said one of said two electro-optical devices is adjacent said third electro-optical device.
  • a system is recited in claim 20 and wherein said speed control means further comprises two switching devices mounted on the periphery of said cylinder, said two devices being relatively angularly displaced by approximately 90, one of said two switching devices being mounted adjacent said slit, and a third switching device mounted on said chassis adjacent said periphery and in substantial alignment with the scribing point between said paper and said pen means and arranged to be in communication with each of said two switching devices as each of said two switching devices rotates adjacent said third switching device.
  • a system as recited in claim 26 further including manually-activated speed-control means for causing said rotating means and said translationally moving means to operate outside of said recording rotational speed range and said recording translational speed range respectively.
  • a system as recited in claim 29 further comprising means for generating pen means dithering signals, and manually operated means for momentarily disabling said extending means and for conducting said dithering signals to said pen means, whereby a dither mark is scribed on said paper at will.
  • a system as recited in claim 17 and wherein said rotating means comprises an electrical motor and gear train means for connecting the rotational output of said motor to said rotatably mounted cylinder means.
  • said supporting and translationally moving means comprises a rod fixedly supported by said chassis and disposed substantially parallel to the longitudinal axis of said cylinder means, carriage means slidably mounted to said rod for holding said galvanometer pen means, a lead screw rotatably mounted parallel to said rod and engaged with said carriage, and said motor and gear train means including additional means for connecting said rotational output of said motor to said lead screw whereby rotational motion of said lead screw causes translational motion of said carriage.
  • a system as recited in claim 34 comprising a microswitch fixedly attached to said chassis near one end of said rod and arranged to be operated by contact with said carriage means in said final position, and means responsive to operation of said microswitch for disabling said rotating means and said translationally moving means.
  • a system as recited in claim 34 comprising a switch fixedly attached to said chassis near one end of said rod and arranged to be operated by contact with said carriage means in said final position, and means responsive to operation of said switch for disabling said rotating means and said translationally moving means.
  • said sensing means comprises a plurality of patientconnected sensors.
  • said galvanometer pen means comprises a plurality of galvanometers, each of said plurality of galvanometers corresponding respectively to one of said plurality of sensors, each of said plurality of galvanometers having a respective pen, and means for extending each of said plurality of sensors to a respective one of said galvanometers.
  • a system as recited in claim 17 further comprising means for generating pen means dithering signals, and manually operated means for monentarily disabling said extending means and for conducting said dithering signals to said pen means, whereby a dither mark is scribed on said paper at will.
  • rotating means includes means to provide a plurality of rotations of said writing surface means to correspond to the translational motion distance of said pen means in moving from said initial position to said final position.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Cardiology (AREA)
  • Physics & Mathematics (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Recording Measured Values (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
US441684A 1974-02-11 1974-02-11 Compressed data display system Expired - Lifetime US3893453A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US441684A US3893453A (en) 1974-02-11 1974-02-11 Compressed data display system
IL46481A IL46481A (en) 1974-02-11 1975-01-21 Data display system
CA218,702A CA1047115A (fr) 1974-02-11 1975-01-27 Systeme d'affichage de donnees condensees
DE19752503822 DE2503822A1 (de) 1974-02-11 1975-01-30 Datenwiedergabeanordnung
FR7503838A FR2260320B1 (fr) 1974-02-11 1975-02-07
SE7501435A SE7501435L (fr) 1974-02-11 1975-02-10
JP50016402A JPS50114085A (fr) 1974-02-11 1975-02-10
NL7501596A NL7501596A (nl) 1974-02-11 1975-02-11 Stelsel voor het weergeven van op levensfuncties en patient betrekking hebbende signalen.
GB5802/75A GB1499516A (en) 1974-02-11 1975-02-11 Patient's vital sign recording apparatus
US05/565,306 US3951135A (en) 1974-02-11 1975-04-04 Compressed data display system
CA236,479A CA1047116A (fr) 1974-02-11 1975-09-26 Systeme d'affichage de donnees comprimees

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Application Number Priority Date Filing Date Title
US441684A US3893453A (en) 1974-02-11 1974-02-11 Compressed data display system

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US05/565,306 Division US3951135A (en) 1974-02-11 1975-04-04 Compressed data display system

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US3893453A true US3893453A (en) 1975-07-08

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US (1) US3893453A (fr)
JP (1) JPS50114085A (fr)
CA (1) CA1047115A (fr)
DE (1) DE2503822A1 (fr)
FR (1) FR2260320B1 (fr)
GB (1) GB1499516A (fr)
IL (1) IL46481A (fr)
NL (1) NL7501596A (fr)
SE (1) SE7501435L (fr)

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Also Published As

Publication number Publication date
FR2260320B1 (fr) 1977-11-18
SE7501435L (fr) 1975-08-12
JPS50114085A (fr) 1975-09-06
CA1047115A (fr) 1979-01-23
IL46481A0 (en) 1975-04-25
NL7501596A (nl) 1975-08-13
DE2503822A1 (de) 1975-08-14
FR2260320A1 (fr) 1975-09-05
GB1499516A (en) 1978-02-01
IL46481A (en) 1977-06-30

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