Dinamap 1045

Catalog Record: Dinamap 1045

Access Key: alsh

Accession No.: 2000-12-10-1 A

Title: Dinamap 1045 : blood pressure monitor / Critikon.

Corporate Author: Critikon, Inc.

Title variation: Alt Title
Title: Dinamap blood pressure monitor 1045.

Publisher: [Tampa, Florida] ; Critikon, Inc., [between 1978 and 1980?].

Physical Descript 1 monitoring device : metals, plastics, glass, rubber ; 12.5 x 30 x 39 cm.

Subject: Monitoring, Intraoperative – instrumentation.
Subject: Monitoring, Physiologic – instrumentation.

Note Type: General
Notes: The early year in the date range for the possible year of manufacture is
based on a sticker located on the bottom of this device. The sticker reads,
“APPLIED MEDICAL RESEARCH [new line] TAMPA, FLORIDA 33607 [new line]
COPYRIGHT 1978 M845 011.W16″. The end year in the date range for the
possible year of manufacture is based on when Applied Medical Research was
acquired by Johnson & Johnson company and renamed Critikon (1979). The date
range could change if documentation, or expert opinion, indicates that it
should be corrected.

Note Type: Citation
Notes: Doyle DJ. 2010 STA annual meeting report. Interface. April, 2010:[5-6].

Note Type: Citation
Notes: Meldrum SJ. The principles underlying Dinamap — a microprocessor based
instrument for the automatic determination of mean artierial pressure. J Med
Eng Technol. 1978;2(5):243-244.

Note Type: Citation
Notes: Szeto AYJ. Mike Ramsey—a medical device entrepreneur. IEEE Eng Med Biol Mag.
2002;21(6)12-13.

Note Type: Citation
Notes: Westhorpe RN, Ball C. lood pressure monitoring — automated non-invasive blood
pressure monitors. Anaesth Intensive Care. 209;37(3):343.

Note Type: Citation
Notes: When you need to know [advertisement]. Anesth Analg. 1976;55(1):[45 of ads].

Note Type: Physical Description
Notes: One automatic blood pressure monitor; It is rectangular in shape – the height
measures less than the width and depth; The measurement provided in the
physical description field (12.5 x 30 x 39 cm) includes space for the cord,
wound and sitting behind the monitor; The front is off-white, and the sides
and top are black; On the front are four digital display screens, one for
mean arterial pressure in “mmHg”, heart rate in “BPM”, systolic pressure in
“mmHg” and diastolic pressure in “mmHg”; There are also a number of switches
on the front of the monitor; These include a power on/off switch, and a mode
of operation switch marked for “AUTO.” or “CAL.”; There are also alarm limit
switches, one switch turns the audible alarm on or off and the other is a
used to change the high and low limits of the alarm; Another switch, located
in the lower left of the front of the device, seems to allow the user to view
all of the readings or only the “MAP” and “HR”; This switch may also allow
the user to initiate a reading outside of the set cycle; Markings around this
switch include, “MAP/HR”, “ALL”, “SELECT FUNCTION”, and “MANUAL READ”;
Finally there are four switches that allow a user to adjust the cycle time;
Marked on the lower right side of the front is “CRITIKON” and “DINAMAP”; The
numbers “1045” run vertically just to the right of the word Dinamap, and
below “DINAMAP” is, “Blood Pressure [new line] Monitor”; On top of the device
are several warning messages, such as, “WARNING DO NOT GAS STERILIZE OR
AUTOCLAVE”; Another label on the top is marked with basic operating
instructions; These include, “AUTO MODE INSTRUCTIONS [new line] 1. Squeeze
air from proper cuff and attach snugly to arm not used for infusion. [new
line] 2. Set alarm switch to ON, mode switch to AUTO, power switch to ON.
Brief tone indicates alarm functional. [new line] 3. Select either “MAP/HR”
or “ALL” functions by momentarily pushing SELECT FUNCTION switch up. [new
line] 4. MAP alarm limits preset to 140 high, 50 low at power turn on. To
change limits, move LIMIT switch to HIGH. At desired limit, return to SET.
Move LIMIT switch to LOW. At desired limit, return to SET. [new line] 5.
Pressure out of limits, alarm sounds for six seconds. Persistent alarm and/or
000 reading, check patient’s pulse, or kinks or leaks in tubing. Turn unit
OFF and repeat steps 1-2-3-4. [new line] 6. Basic time between readings one
minute. To increase time, switch one or more ADD MINUTES switches up and add
to one minute. [new line] 7. If any display = 000 the device is unable to
measure that parameter.”; On the back of the monitor is the power cord and
ports for the blood pressure cuff; The power cord measures approximately 256
cm in length; In the right lower corner is a switch and screw to adjust the
tone and volume of the alarm; A plate affixed to the back of the machine is
marked with the following, “CRITIKON, INC. [new line] TAMPA, FLORIDA 33607
[new line] MODEL 1045.00006 VOLTS 120 [new line] FREQ. 60HZ AMPS 1.0 [new
line] SERIAL NO. 1045-10126″; A sticker on the bottom of the monitor is
marked with, “APPLIED MEDICAL RESEARCH [new line] TAMPA, FLORIDA 33607 [new
line] COPYRIGHT 1978 M845 011.W16″.

Note Type: Reproduction
Notes: Photographed by Mr. Steve Donisch in January, 2015.

Note Type: Acquisition
Notes: Donated to the WLM by George S. Bause, MD, the Wood Library-Museum of
Anesthesiology Honorary Curator.

Note Type: Historical
Notes: Blood pressure is one of the vital signs monitored by anesthesiologists. The first widely used automatic electronic blood-pressure monitor was the Dinamap 825. Dinamap is an acronym for ‘Device for Indirect Non-invasive Mean Arterial Pressure.’ Introduced in 1976 and designed by Maynard Ramsey, M.D., Ph.D., the Dinamap 825’s primary components included Intel’s first central processing unit, the Intel 4004, an air pump, bleed valve, and pressure transducer. The Dinamap 1045, pictured here, was introduced around 1978.

In designing these devices, Dr. Ramsey employed the oscillometric method for measuring blood pressure. This involves measuring variations in the pressure of an inflated cuff which are due to pulsations in the artery below it. The computer code controlled the inflation and deflation of the cuff and calculated the blood pressure using input from the pressure transducer. The first Dinamap provided mean arterial pressure only. Subsequent models, like the 1045, also provided systolic pressure, diastolic pressure, and heart rate. Dr. Ramsey’s decision to use oscillometry was a good one. Most of the automatic, non-invasive blood pressure devices in use today employ this method.

The Dinamap was first manufactured by Dr. Ramsey’s company, Applied Medical Research. In 1979 he sold the company to Johnson & Johnson, which subsequently formed a new division called Critikon. Dr. Ramsey stayed with Critikon for 15 years and continued to lead the development of improved versions of the Dinamap.

Note Type: Publication
Notes: Ramsey M. Noninvastive automatic determination of mean arterial pressure. Med
Biol Eng Comput. 1979;17(1):11-18.

Note Type: Exhibition
Notes: Selected for the WLM website museum exhibit (noted January, 2015).