Inditherm Patient Warming Systems Service manual

0473

Patient Warming Systems

Service Manual

Inditherm Medical

Houndhill Park

Bolton Road

Rotherham

S63 7LG

Tel: [phone]

Fax: [phone]

e-mail: [e-mail]

www.inditherm.com/medical

©Inditherm plc 2007

Inditherm Service Manual

Contents:

Page

Warnings 3

Introduction 4

Product Range 5

System Description 6

Fault Finding 8

Repairs 11

Mattress/Blanket

Mattress/Blanket connector 11

Control cable

Control cable connectors 11

Control Unit 14

Clamp assembly 14
Display PCB 14
Case upper half 14
Output fuse 15
Control PCB assembly 15
Transformer assembly 15
Power on/off switch 16
Mains power cable 16
Control Cable 17
Case lower half 19

Testing

Control Unit 20
Mattress/Blanket 21
System Test 22

Spare Parts List 23

Technical Specification 25

© Inditherm plc, 2007

Copyright: All rights reserved. No part of this handbook may be reproduced, stored in a retrieval system
or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise,
without the prior permission of Inditherm plc.

Patient Warming Systems Page 2 of 25 Rev 1.5; 21-09-07

Inditherm Service Manual

WARNINGS:

Any person carrying out repairs or service should have received adequate
training and be competent to carry out the work.

The control unit should be disconnected from the mains supply before the
covers are removed.

All work should be carried out with the equipment disconnected from the
mains supply wherever possible.

This Service Manual should be read in conjunction with the Operating
Instructions for the system.

It is recommended that the unit is cleaned and decontaminated prior to
handling, unless a decontamination certificate or statement that the system is
free of hazard is supplied.

Patient Warming Systems Page 3 of 25 Rev 1.5; 21-09-07

Inditherm Service Manual

INTRODUCTION:

This Service Manual is for use by qualified engineers and technicians only. Servicing carried out
by any person other than authorised Inditherm engineers will invalidate any warranty on the system.

The Inditherm Patient Warming Systems are designed for use in the operating room, recovery room,
anaesthetic room and accident & emergency department. They provide safe and controlled
warming to assist patients to maintain normal body temperature. The warming medium is available
as:

• A mattress for use under a patient

• A recovery blanket or operating room blanket to be placed over a patient on a bed or trolley.

Different sizes and models of mattress and blanket are available for various procedures and
situations. Mattresses are sealed to prevent ingress of fluids and allow cleaning. Integral straps are
provided to ensure mattresses can be securely fastened to the operating table or trolley.

The system is powered and controlled by an electronic control unit. The mattresses and blankets
are powered at low voltage, ensuring safety for patients and operators. The temperature is
controlled automatically to user-selected level. An over-temperature safety cut-out is integrated
into each mattress and blanket.

The control unit is powered from a standard mains supply input and produces a nominal working
output of 24Vac to the mattress or blanket. The system has 4 pre-set operating temperatures of 37,
38, 39 and 40°C and is designed to be operated continuously, maintaining a uniform heat under the
patient.

Patient Warming Systems Page 4 of 25 Rev 1.5; 21-09-07

Inditherm Service Manual

PRODUCT RANGE:

Note: Any mattress or blanket can be used with any control unit, but is limited to only one mattress
or blanket per unit.

Model

Size Description

OTM1 1900 x 585 x 40 mm

Operating Room Mattress, Full Length

OTM1-N 1900 x 535 x 40 mm

OTM2 1200 x 585 x 40 mm

Operating Room Mattress, ¾ Length

OTM2-N 1200 x 535 x 40 mm

GTM1 1070 x 585 x 40 mm

Operating Room Gynaecology Mattress

GTM1-N 1070 x 535 x 40 mm

PTM1 560 x 500 x 40 mm Operating Room Paediatric Mattress

OTB1 500 x 1070 x 40 mm Operating Room Blanket

OTB2 500 x 870 x 40 mm Operating Room Blanket

RB1 1660 x 800 x 40 mm Recovery Room Blanket

RB2 1660 x 1200 x 40 mm Recovery Room Blanket

MECU1 160 x 240 x 230 mm Electronic Control Unit

Patient Warming Systems Page 5 of 25 Rev 1.5; 21-09-07

Inditherm Service Manual

SYSTEM DESCRIPTION:

Control Unit

The control unit is a precision temperature controller to be
used in conjunction with an Inditherm warming mattress or
blanket.

The control unit comprises a single case, with integral clamp,
containing mains power inlet, mains fuse, transformer,
control PCB, display and controls.

On the front of the unit is a display and control panel from
which all the functions can be accessed, there are three
control buttons, and an LCD display. A captive cable for
connection to the mattress or blanket is hard wired through
the front face of the unit.

The control unit provides a 24Vac supply to the mattress or blanket and receives temperature
information back. The control unit output is protected by a 1600mA fuse, which is accessible from
the base of the unit. The controller automatically adjusts to the type of mattress or blanket
connected.

The control unit takes signals from the temperature sensor in the mattress or blanket and the
readings are used to control the power output and alert the user to over and under temperature
faults.

Control panel layout is
as shown. For function
of controls, and display
parameters, please see
Operating Instructions

LCD Screen

LCD Screen

Enable Button

Enable Button

Warning Indicator

Warning Indicator

Scroll Button

Scroll Button

Alarm Cancel /

Alarm Cancel /
Reset Button

Reset Button

Patient Warming Systems Page 6 of 25 Rev 1.5; 21-09-07

Inditherm Service Manual

Mattresses

Mattresses are available in various sizes
and are only designed to operate under the
patient. The mattress provides an even
temperature over the whole surface and is
extremely flexible.

The basic construction of the mattresses
remains the same throughout the range.
The mattresses are water and solvent
resistant and have been tested for bio­compatibility to allow skin contact during
use. All seams are fully sealed by RF
welding.

The internal patented Inditherm carbon
polymer material provides the heat source,
and internal temperature sensor provides the
output to the control unit for temperature
control. The mattress has a thermal cut-out
that will not allow the mattress to overheat.

A pressure relief pad is integrated into the mattress, underneath the flexible warming surface. This
prevents pressure sores without any attenuation of the warming performance.

Straps are used to retain the mattress in-situ and it is important that the mattress is securely fastened
to the operating table or trolley.

Blankets

Blankets are designed to operate over the
patient. There are two types of blanket
available, one for the operating room and the
other for areas such as recovery room,
intensive care unit, etc. The operating room
blankets are constructed in the same manner as
the mattresses, but without the pressure relief
pad. The recovery blanket has lighter outer
material and stitched seams.

Patient Warming Systems Page 7 of 25 Rev 1.5; 21-09-07

Inditherm Service Manual

FAULT FINDING:

General Performance

On initial start up, if the ambient temperature is low, the mattress/blanket will take longer to achieve
the desired temperature. If the desired temperature is not achieved within 40 minutes the alarm will
sound. Should this happen select the reset/alarm button and the unit will restart and the system will
allow another 20 minutes for the desired temperature to be achieved.

The control unit will power the mattress/blanket and monitor temperature performance. Once the
mattress/blanket reaches the desired temperature the control unit will adjust power input to ensure
the desired temperature is maintained. If the maximum allowed temperature is achieved the over
temperature alarm will sound. If the alarm is activated select reset/alarm button and the unit will
restart. An internal safety cut-out temperature management system will ensure the mattress/blanket
will never achieve a temperature greater than 43°C under any fault condition.

When the system is powered on it should follow the cycle below. In case of any error messages or
other faults, refer to the Fault Finding chart.

Display Screen Readout

Bleep will be heard on switch on

Inditherm
V2.03E

English UK
>>>> to change language

Language
English UK

Bleep will be heard

System Check

Bleep will be heard

System OK

Bleep will be heard

Alarm Check

Bleep will be heard

Alarm OK

Bleep will be heard

∧∧∧∧ 37 °C ∧∧∧∧

>>>> 37 °C <<<<

∨∨∨∨ 37 °C ∨∨∨∨

Action Required

None

Option to change Language
See Control Instructions

Bleep will be heard

None Screen Indicates Language

None Automatic system test

None

None Automatic test of alarm sound

None User indication that alarm ok

User can change temperature set

User can change temperature set

User can change temperature set

Information

First screen indicating initialisation
started

For UK users, take no action and
system will automatically continue

User indication that system is OK

Display showing temperature setting.
Arrows will point upwards whilst
heating up to set temperature.

Display showing temperature setting.
Arrows point horizontal to indicate
that set temperature is reached.

Display showing temperature setting.
Arrows will point downwards to
indicate cooling to set temperature.

Patient Warming Systems Page 8 of 25 Rev 1.5; 21-09-07