Implantable multi-channel temperature transmitte

Fryer, T. B.

Pope, J. M.

Winget, C. M.

English

NASA Technical Reports Server

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. I. ,CCEZDINGS 
Cunference on Engineering in 
i, zdicine and Biology - I967 
2",h  Annual Meeting, 
zoston, Massachusetts 
No 13-16 .$67 .-&hrm or rete1 o manuscript 
L J L Y  31 .  1967 
-;are typing your manuscript please 
.,day your Form B 
P.4 ii;or (s) : 
be typeset) 
1 -  TL 
Name 
- B . Fryer  
(initials only and last name) 
' 
Electronics  Research Branch 
. Ames -~ Research Center, NASA 
Moffett F ie ld ,  Cal i fornia ,  USA 
Department laboratory. etc 
Institution. hospital. etc 
9403 5 City and country 
2 C .  M. Winget 
Name (initials only and last name) 
Physiology, Branch 
Department, laborator#. etc 
~- Ames Research ,.center, NASA 
Institution. hospital. etc. 
Moffett F ie ld .  Cal i fornia ,  USA 
94035 City and country 
3 J. M. PoDe 
Name (initials only and last name) 
- Elec t ronics  Research Branch 
Ames Research Center, NASA 
Moffett F i e l d ,  Cal i forn ia?  USA 
Department, laboratory. etc. 
Instituion, hospital. etc. 
94035 Cityand country 
Name (initials only and last name) 
4 
Department. laborat&y;etc. 
Institution. hospital, etc. 
A multichannel t ransmi t te r  su i t ab le  f o r  t he  
simultaneous measurement of four  independent 
temperatures has been designed and constructed.  
The low power consumption and small s i z e  make thi!  
u n i t  su i tab le  f o r  use in  chronic implant experi-  
ments. 
radio telemetry has proved usefu l  i n  many physio- 
l og ica l  experiments, espec ia l ly  the  study of c i r -  
Jcadian rhythms where the animal must be monitored 
mtinuously without outs ide influences.  Single- 
iannel systems f o r  t h i s  purpose have been re -  
)rted1'2y3 and widely used. BeFause of t h e  s ig-  
i f ican t  temperature gradients  t h a t  e x i s t  irl the  
~ d y  it w a s  deemed desirable  t o  measure a number 
e temperatures simultaneously f o r  a more com- 
Lete study of t h e  mechanisms involved i n  c i rca-  
ian rhythms. 
i t t e r s  could be employed, the need f o r  mult iple  
x e i v e r s ,  e t c . ,  makes the  use of a s ing le  t rans-  
i t t e r  with a number of sensors desirable .  The 
?lemetry system shown in  Fig.  1 is  designed t o  
2asure four  o r  more temperatures using one radio 
ransmitter. 
f so l id-s ta te  switches i s  used t o  per iodica l ly  
mple  a reference r e s i s t o r  and each of four  
nermistor sensors. The res i s tance  change i s  
sed t o  cont ro l  the  i n t e r v a l  between pulses in  
he subcarr ier  o s c i l l a t o r .  The operation of the  
ubcarrier o s c i l l a t o r  and i t s  modulation of t he  
F t ransmi t te r  i s  similar t o  the  system described 
n Ref. 1 f o r  single-channel operation. The ad- 
i t i o n  of a low-power nand gate  r i n g  counter has 
xtended the  capabi l i ty  t o  multichannel use. 
The measurement of body temperature v i a  
Although a number of single-channel t rans-  
A r i ng  counter ac t iva t ing  a s e r i e s  
REFERENCE 
-. _ _  - _ _ -  1 
Fig. 1. System Block Diagram 
@& -3. 
(LEFT) 
https://ntrs.nasa.gov/search.jsp?R=19680024873 2020-03-23T23:24:53+00:00Z
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TITLE (to be typeset) AN IMPLANTABLE MULTI-CHANNEL TEMPERATURE TRANSMITTER 
I 
FORM 
Author(s1: . .  
T. B. Fryer 
C.  M. Winpet 
J. M. Pope 
T. B. Fryer - I  
' 
M A N  U SC R I PT 
for the RIGHT column 
of your page in the 
PROCEEDINGS 
20th ACEMB 
Do not fold this sheet. 
Use cardboard backing when 
mailing. 
Y o u r  manuscript will be 
PHOTOGRAPHED 
and will appear in the Proceeding 
EXACTLY as typed in the boxes 
outlined on  Forms C (left) and 
C (right). 
Fig. 2 shows a photograph of t he  transmit-  
t e r .  
bat tery,  weighs 22 grams with a volume of 8 cc. 
Since the power supply (ba t te ry)  i s  the  l a r g e s t  
and heaviest  component, it is s ign i f i can t  t h a t  
the  en t i r e  system i s  designed t o  operate from on1 
mercury c e l l  (1.4V) and consumes only 27 pA of 
current.  
provide 6000 hours o f  operation. 
The sealed and pot ted un i t ,  including 
An m675 c e l l  weighing 3 grams w i l l  
Fig. 2. S igna l  Conditioning and Transmitter 
Electronics  P r io r  t o  Assembly i n  An 
Implantable Hermetic Container. 
L. T . Fryer, "Micropower Transmitter f o r  Temp- 
erature Measurements," Proceedings of the  8 t h  
Annual Conf. on Engineering' i n  Medicine and 
Biology, Vol. 7, 1965 - Phila. ,  Penn. 
t u re  Temperature Telemetry, " 5th Annual San 
Diego Symposium of Biomedical Engineering, 
June 6-8, 1965, San Diego, Calif. 
3 .  R. S. Mackay, "Telemetering from Within the  
Body," pp. 148-233 of Biomedical Telemetry, 
by C.  A. Caceres, Academic Press 1965. +. T.  Fryer, H. Sandler, B. Datnow, "A M u l t i -  
channel Implantable Telemetry System," the  
7 th  In te rna t iona l  Conference on Medical and 
Biological Engineering, Stockholm, Sweden, 
?. J. S. Brown, J. P. Pedico, "Micropower Minia- 
Ax. 14-19, 1967. 
(RIGHT 
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An implantable multi-channel temperature transmitter

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