Siemens Pressure Test Service manual
Pressure Test
Service
SP
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
Use of the PTU (Pressure Test Unit) 1
• 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 1
• 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
1 - 1
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 1
NOTICE
• 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.
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.
• 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
Siemens AG SPL2-120.074.01 Page 1 of 4 Pressure Test
Medical Solutions Rev. 02 08.04 CS PS 24
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.
1 - 2 Preparation
Fig. 1
General Measurement Procedure 1
• 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 recommen-
ded 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 1
• 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 1
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
Loading...