Siemens Pressure Test Service manual

Pressure Test

SP

Service

Shock Wave Pressure and Position Control

Test and Check Specifications

	© Siemens AG 2000
	The reproduction, transmission or
	use of this document or its contents
	is not permitted without express
	written authority. Offenders will be
	liable for damages.	All rights,
	including rights created by patent
	grant or registration of a utility
	model _or_ design,_are_ reserved.
	English
Print No.: SPL2-120.074.01.02.02	Doc. Gen. Date:	08.04

Replaces: SPL2-120.074.01.01.02

0 - 2			Revision
Chapter	Page	Rev.
All	All	02

Document revision level

The document corresponds to the version/revision level effective at the time of system delivery. Revisions to hardcopy documentation are not automatically distributed.

Please contact your local Siemens office to order current revision levels.

Disclaimer

The installation and service of equipment described herein is to be performed by qualified personnel who are employed by Siemens or one of its affiliates or who are otherwise authorized by Siemens or one of its affiliates to provide such services.

Assemblers and other persons who are not employed by or otherwise directly affiliated with or authorized by Siemens or one of its affiliates are directed to contact one of the local offices of Siemens or one of its affiliates before attempting installation or service procedures.

Pressure Test	SPL2-120.074.01	Page 2 of 4	Siemens AG
	Rev. 02 08.04	CS PS 24	Medical Solutions

Contents	0 - 3
	Page

1 _______Preparation____________________________________________________ 1 - 1

Use of the PTU (Pressure Test Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1 Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1 Prerequisite: Water Filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1 General Measurement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 2 Testing the PTU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 3 Measurement with the PTU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 3 Evaluation of Measured Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 4

2 _______LITHOSTAR Multiline____________________________________________ 2 - 1

Preparation . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 1
Attaching the Test Unit . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 1
Adjusting the Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2		- 1
Shock Wave Pressure Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 1
Search for Maximum Pressure	. . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 1
Pressure Check . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . 2	- 2

3 _______LITHOSTAR C-, Standard System and Modularis_____________________ 3 - 1

Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 1

Attaching the Test Unit to the LITHOSTAR . . . . . . . . . . . . . . . . . . . . . 3 - 1
Attaching the Test Unit to the LITHOSTAR Modularis. . . . . . . . . . . . . . . . 3	- 1
Shock Wave Pressure and Position Check . . . . . . . . . . . . . . . . . . . . . . . 3	- 2
Pressure Check for the LITHOSTAR C-System and Modularis . . . . . . . . . . . 3	- 2
Pressure Check for LITHOSTAR Standard System . . . . . . . . . . . . . . . . . 3	- 2

End of Test . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 2
4 _______OTM__________________________________________________________ 4 - 1
Attaching the Test Unit . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 1
Adjusting the SONOLINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 2
Basic Axial and Lateral Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 2
Axial Adjustment. . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4	- 2
Sensor Positioning. . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 3
Shock Wave Pressure Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4		- 4
End of Test . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4	- 4
Programming the Basic Settings	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 5
Basic Axial Setting . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 5
Basic Lateral Setting . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 5
SONOLINE SL 1 . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4	- 6
SONOLINE SI 200 / SI 250 . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 6

5_______Certificate_____________________________________________________ 5 - 1

6_______Changes to previous version _____________________________________ 6 - 1

Siemens AG	SPL2-120.074.01	Page 3 of 4	Pressure Test
Medical Solutions	Rev. 02 08.04	CS PS 24

0 - 4	Contents
	Page

Pressure Test	SPL2-120.074.01	Page 4 of 4	Siemens AG
	Rev. 02 08.04	CS PS 24	Medical Solutions

Preparation

1 - 1

Use of the PTU (Pressure Test Unit)

•The pressure test unit can be used to check both the shock wave pressure and the agreement or coincidence of the focal position with the aiming device of the ultrasound locating system.

Required Test Equipment

• Pressure test unit	30 95 408 J1008
• Storage oscilloscope, e.g. Fluke Scope Meter	73 92 074
• PTU adapter, Multiline	70 41 028
• PTU adapter, standard system/C system	98 17 347
• PTU adapter, OTM	98 18 006
• Coupling bellows (only for Modularis)	16 12 337
• Clip (only for Modularis)	70 56 823
• Clip (for C plus shock wave head)	70 61 013

NOTICE

The PTU is a test unit which may be used only for the described checking purposes. It is not a measuring instrument for absolute values!

Prerequisite: Water Filling

NOTICE

Before the PTU is transported at near or sub zero temperatures, the water must be removed from its sensor cupola. Before putting it back into operation (after transport), wait until the glycerine filling of the actual sensor has adapted to normal operating temperature.

•The sensor dome of the test should already be filled with distilled wateror must be filled with distilled water prior to initial operation. This water filling should be changed from time to time depending on its degree of pollution due to algae (turbidity).

•The water must be allowed to "go stale" for at least 3 days. Fresh water leads to the formation of bubbles and therefore falsifies measurement results.

•Unscrew the sensor dome.

•Fill the sensor dome with distilled water, mount the sensor onto the dome from above and screw it on tight.

•Remove (cap) screw from dome.

•Use a syringe to fill water into the dome until it no longer contains any air bubbles.

•Close the hole again by reinserting the screw.

NOTICE

If a shock wave head is replaced, it also may be filled only with "stale" water. As with the dome, fresh water falsifies measurement results here too. This is due to the high gas content of the water.

Siemens AG	SPL2-120.074.01	Page 1 of 4	Pressure Test
Medical Solutions	Rev. 02 08.04	CS PS 24

1 - 2	Preparation

Fig. 1

General Measurement Procedure

•Due to the cumulative tolerances involved (mech. tol., temperatures, tol. in the charging power circuit, offset) the following measurement sequence must be followed.

For absolute measuring, a scope is also required in addition to the PTU. If no comparison measurement has been done yet on a system, an absolute measurement must be performed. During this the measuring signal is evaluated with an oscilloscope and the reading on the LCD display is logged.

If no part of the system configuration (shock wave head, charging unit, power unit, power cable) has changed, a comparison measurement via the LCD display will suffice for subsequent repeat measurements. This is done by comparing current readings with the reference values originally determined when the new shock wave head was installed.

In case of doubt, it is generally advisable to perform the absolute measurement.

•Always perform the absolute measurement after replacing shock wave components (charging or power unit, shock wave head). This enables more exact information on parts subject to wear.

•The oscilloscope must have a sampling rate of at least 100 megasamples. The input of the scope must be terminated with 50 ohms (not 1 megohm !).

If no 50-ohm input is available, the sensitivity of the PTU must be recalculated accordingly (see evaluation of measuring data).

•A mean value calculation must be performed during the measurements. It is recommended that you determine the mean value for 5 individual measurements.

•Use of the scope’s automatic functions (e.g. peak, MAX, ...) may lead to measuring errors, since these functions are usually referenced to the baseline. The latter can, however, be superimposed with an Offset.

The following procedure is therefore recommended. The relevant voltage value is not the peak value, but rather the difference between the voltage in the peak and the voltage lying approx. 2 µs in front of the peak (Fig. 1).

•In the illustration (Fig. 1) the voltage difference between the cursors, which lie 2 µs apart, is 97 mV. The automatic peak function would have yielded 94.6 mV here, however the resulting difference can be much greater.

Pressure Test	SPL2-120.074.01	Page 2 of 4	Siemens AG
	Rev. 02 08.04	CS PS 24	Medical Solutions

Preparation

1 - 3

Testing the PTU

•After pressing the test button, the display reading must be between 95 and 105. Always check this value first before using the PTU.

Measurement with the PTU

NOTICE

Before beginning the measurement, trigger at least 50 shock waves at the maximum energy level. The PTU must not yet be connected at this time.

•Before attaching the PTU, ultrasound gel must be applied to the coupling surface between the PTU and the coupling bellows. Make sure that you apply the gel so that no air bubbles are trapped inside. Since the coupling dome of the PTU is transparent, it should be possible to check for bubbles by looking through the surface from the side. At the same time, you should also make sure that the coupling pressure is high enough.

It must be possible to place the coupling bellows around the coupling dome of the PTU; if necessary, the fine pressure must be increased for the measurement of Lithostar Standard and "C" units.

•A waiting period of approx. 5 seconds must be maintained each time a shock wave is triggered in order to protect the PTU. The reason for this is cavitation in the measuring medium. In addition to its possible destructive effect, cavitation also causes falsification of measurements. With the OTM no bubble layer may be visible in the US.

NOTICE

If measurements are taken with the oscilloscope, the released energy can be more exactly determined.

This method of measurement is urgently recommended for determination of the reference value.

•Pressure measurements are generally dependent on the water temperature. Since the systems are generally located in rooms with controlled temperature conditions, this usually poses no problem. If, however, the heating or air conditioning system fails or measurement is performed after a prolonged therapy session, falsified measurements may result. A difference in temperature of 3 - 4°C from the last comparison measurement is not significant.

•To prevent measuring errors, a ground cable must always be connected directly to the PTU. An adapter plug for connecting a BNC connector to a banana socket is provided for this purpose. The black banana socket must be connected to a ground point near the shock wave head via a cable. Make sure that this connection has good contact.

Failure to connect this cable properly will result in triggering and measuring errors. Furthermore, in this case the reference level for the measuring electronics is not clearly defined, thus also leading to noticeable measuring errors.

•The absolute peak is not decisive for the evaluation, but rather the voltage differences between the peak value and the value 2 µs before the peak (Fig. 1).

•The measured value should be determined by averaging at least five individual measurements.

Siemens AG	SPL2-120.074.01	Page 3 of 4	Pressure Test
Medical Solutions	Rev. 02 08.04	CS PS 24