Inditherm Patient Warming Systems Service manual

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

0473

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.

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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.

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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.

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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

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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

Warning Indicator

LCD Screen

Scroll Button

Enable Button	Alarm Cancel /
	Reset Button

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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.

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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		Action Required		Information
					Bleep will be heard on switch on
	Inditherm		None		First screen indicating initialisation
	V2.03E				started
	English UK		Option to change Language		For UK users, take no action and
	> to change language		See Control Instructions		system will automatically continue
					Bleep will be heard
	Language		None		Screen Indicates Language
	English UK
					Bleep will be heard
	System Check		None		Automatic system test
					Bleep will be heard
	System OK		None		User indication that system is OK
					Bleep will be heard
	Alarm Check		None		Automatic test of alarm sound
					Bleep will be heard
	Alarm OK		None		User indication that alarm ok
					Bleep will be heard
					Display showing temperature setting.
	37 °C		User can change temperature set		Arrows will point upwards whilst
					heating up to set temperature.
					Display showing temperature setting.
	> 37 °C <		User can change temperature set		Arrows point horizontal to indicate
					that set temperature is reached.
					Display showing temperature setting.
	37 °C		User can change temperature set		Arrows will point downwards to
					indicate cooling to set temperature.

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