вход по аккаунту



код для вставкиСкачать
Patent Translate
Powered by EPO and Google
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
The present invention relates to a shock wave therapeutic device coupler (shock wave) for
transmitting shock waves from a shock wave source to a patient to be treated, wherein the
coupler comprises a dimensionally stable elastic material having a wet outer surface. Coupling
coupler). BACKGROUND OF THE INVENTION During operation of the shock wave source of a
calculus breaking device (see DE-A 33 28 50 51), for example for breaking up kidney stones,
where shock wave pulses are generated by electrical coils, often the function check There is a
need to do. For example, the focus position, the pressure distribution or pressure amplitude of
the shockwave pulse correspond to such a test. It is appropriate to perform such an examination
regularly when using a shock wave source. However, such an inspection is also necessary at the
time of initial installation, after remodeling and at the time of repair. If, for example, the means
for focusing the shockwave pulses (e.g. an acoustic lens or reflector) are replaced, then it must be
checked whether the same focus position has been obtained as compared to the state before
replacement. . A shockwave sensor which can be used in particular for the calculus breaking
device is known from DE 34 37 976 A1. SUMMARY OF THE INVENTION The present invention is
based on the idea of using a shock wave sensor, in particular an electrical pressure measuring
element, and a shock wave indicator as test means for performing functional tests. In the case of
a shockwave indicator, in addition to direct monitoring of the impact point of the shockwave
pulse, an evaluation can be made after the total energy received. Besides manufacturability and
inspection costs, good handling of the inspection means is important. Equally important are also
couplings which are as reproducible as possible and lossless in a given geometry. The invention
is characterized in that a coupler of the kind mentioned at the outset is formed, in particular
during normal operation of the shock wave source, ie for example for calculus fractures, so that a
simple examination of the function of the shock wave source is possible after bonding. During the
procedure, it is necessary to be able to monitor the function of the shockwave source. [Means for
Solving the Problems] In order to achieve this object, the present invention is characterized in
that a shock wave sensor is embedded in a dimensionally stable elastic material. The shockwave
sensor, which can be embodied in particular as an electrical pressure measuring element, but
also as a shockwave indicator, is embedded in a particularly dimensionally stable hydrogel.
Shockwave sensors in principle use all inspection means suitable for measuring shockwaves, but
in particular small electric pressure sensors and small visual indicators.
The coupler has a suitable shape, for example disc-shaped or round-wood-shaped, and can be
mounted on its coupling face in a predetermined relationship to the shockwave source by means
of a holder. An advantage here is the good coupling of the shockwave pulses to the shockwave
sensor. What is necessary in examining the function of the calculus breaking apparatus is mainly
the wetting of one side of the coupler, the fixing of the coupler to the shock wave source, and the
measurement. In particular when transparent hydrogels are used, direct observation or visual
detection and evaluation of the front and / or back of the shockwave indicator used as a sensor
without disassembly is possible. If a piezoelectrically activated PVDF sheet is used as a
shockwave sensor, the measurement errors caused by the unwanted movement of the
measurement sheet are reduced. Next, an embodiment of the present invention will be described
in detail with reference to the drawings. FIG. 1 shows a shockwave source 1 comprising the main
components, namely the shockwave generator 3, the transmission section 5 with focusing means,
and the coupling membrane 7. The coupler 11 is in contact with the bonding film 7 while being
supported by the hollow cylindrical holder 9. This coupler 11 consists of a dimensionally stable
elastic material, in particular a hydrogel with a wet surface. The free end face or coupling surface
12 of the concave-convex coupler 11 is pressed against the patient 13. The coupler 11 is used to
transmit shockwave pulses from the shockwave source 1 to the patient 13. Such a device is
described in detail in DE-A 3605 277. A shock wave sensor 15 is embedded in the coupler 11. In
the illustrated embodiment, the shockwave sensor 43-15 is an electrical sensor, in particular a
13E electronic ceramic or a piezoelectric crystal 17 and is connected to the measuring device 21
via a lead 19. The piezoelectric crystal 17 is in particular arranged in the central region or center
of the coupler 11, ie on the central axis 22 of the shockwave source 1. It is also possible to
arrange a large number of piezoelectric crystals 17 in a radial direction about the central axis 22
or on a ring centered on the central axis 22. During normal operation of the shock wave source
1, ie, for example during a calculus fracture procedure of the patient 13, the function of the
shock wave source 1 can be examined continuously by means of the piezoelectric crystal 17 and
the measuring device 21. This check consists, for example, in the monitoring of the exact (or preset) pressure amplitude of the shockwave pulses at the location of the shockwave sensor 15.
When operating parameters such as an operating voltage of 15 kV, a condenser capacity of 0.5
μF, a transfer section length of 20 cm, etc. are preset and reference operation and positioning
are performed by reference measurement previously performed on the factory side, It is known
that a preset amplitude (reference value) of the shock wave pulse appears at the position of the
shock wave sensor 15. This means that during continuous treatment procedures where up to
1000 shockwave pulses can be used per patient, if the pressure amplitude detected by the
shockwave sensor 15 deviates from the reference value by a preset percentage, this means that
the shockwave source 1 It can be inferred that a problem arose inside. It is then possible to
discontinue the treatment procedure when a relatively high pressure amplitude is measured, and
to discontinue the treatment procedure and to test the device if the pressure amplitude is too
low. Furthermore, with the shockwave sensor 15 embedded in the coupler 11, the shockwave
source 1 can optionally be recalibrated or adjusted after any necessary repairs or maintenance.
For example, if an electromagnetic flat coil is used, as is well known as shock wave generator 1,
that flat coil may be replaced with another coil during maintenance, in which case the new coil
The center may shift slightly. Therefore, when the shockwave pulse appears at the shockwave
sensor 15, a slightly offset value appears instead of the expected reference value. The coil can be
adjusted anew until a preset reference value is obtained. This ensures that the shockwave source
1 has the same characteristics as before maintenance or repair. The reference value relating to
the new adjustment of the shock wave source 1 need not be the same reference value as socalled "on-line" operation for the patient 13. That is, for example, the voltage value of the
operating parameter may be 12 kV in place of the above-described 15 kV in the therapeutic
treatment, or may be varied from 12 kV to 20 kV, for example. In FIG. 2, the same parts as in FIG.
1 are given the same reference numerals. The shockwave source 1 likewise comprises a
shockwave generator 3, a transmission section 5 with focusing means, and a coupling membrane
7. A holed device 30 is fixed to the holder 9 of the outer rim 1 as a ballast at its periphery. The
metal film 30 has a hole 32 at the center thereof, and the hole 32 is formed coaxially with the
central axis 22 of the shock wave source 1. The hole 32 is provided with a partially piezoelectric
sheet, for example a PVDF sheet 34 whose central area is piezoelectrically activated or polarized.
One annular lead-out electrode 36 is provided on each side of the PVDF sheet 34, the electrode
36 being arranged outside the polarized surface. The lead wire 19 is connected to the lead-out
electrode 36, and the lead wire 19 is guided to the measuring device 21. The shock wave sensor
15 is formed in this embodiment by the PVDF sheet 34 and the annular extraction electrode 36.
Such a shockwave sensor is described in detail in DE 35 45 382 A1 (JP 62-154900). The shock
wave sensor 15 is embedded in the dimensionally stable gel coupler 11 held by the perforated
metal film 30. The disk-shaped coupler 11 has a wet mounting surface in contact with the
bonding film 7 without air bubbles. Other similarly wet mounting surfaces are pressed against
the patient to be treated. As the shockwave pulse strikes the PVDF sheet 34, this is detected by
the measuring device 21 by means of a capacitance measurement via the extraction electrode 36.
From this measurement, the amplitude of the shockwave pulse is inferred. The function and
handling of the coupler 11 are the same as in the embodiment of FIG. Also in FIG. 2, it is possible
to “on-line operation”, ie to continuously monitor the shockwave pulses during the treatment
procedure. Only the coupler 11 with the shockwave sensor 15 is shown in FIG. The shock wave
sensor 15 includes a large area PVDF sheet 34 having holes, and the PVDF sheet 34 is polarized
(i.e., piezoelectrically activated) at predetermined minute partial area points, and metal contacts
are formed at the parts. 40 is deposited. The metal contacts 40 are each connected to the
measuring device 21 via leads 19. According to this embodiment, the charge generated on the
sensor surface activated by the impact of the shock wave pulse is galvanically detected by the
metal contact 40, transmitted galvanically by the lead 19, and measured in the measuring device
21, for example as a function of time. It is processed according to the voltage signal which
reproduces the various pressure fluctuation. In this embodiment, by using a large number of
PVDF sheets, it is possible to measure simultaneously in a large number of concurrent or frontto-back measurement points. FIG. 4 mainly shows an embodiment used during installation,
inspection or maintenance work. The shape-stable gel coupler 11 is formed in the shape of “°
round shape”. That is, the coupler 11 has such a size that the focal point F of the shock wave
source 1 is located inside the coupler 11.
This is illustrated by the edge beam 46.48. Furthermore, the focal plane is located near the
patient side coupling surface 12. A thin flat shockwave indicator 50 is embedded in the coupler
11 symmetrically with respect to the central axis 22 at the position of the expected focal point F,
ie near the coupling surface 12. The shockwave indicator 50 is composed, for example, of a
circular ceramic plate which is subject to material damage by the action of the shockwave, or a
thin metal foil, in particular lead foil, which is deformed or dented by the action of the
shockwave. In this case, no electrical connection is necessary. After the above-mentioned
operation, the coupler 11 is positioned in the holder 9 in such a way that, for the distance to the
shock wave generator 3, the length of the transmission zone 5 follows the distance to the
focusing means, etc. Be done. After firing one or more shockwave pulses, the operator is at
shockwave indicator 50, ie by visual inspection of shockwave indicator 50 in the focal plane,
whether mechanical deformation or damage is present at the desired focal point That is, it can be
confirmed whether or not the focal point F is actually located at a preset point. If this is not the
case, further inspection and adjustment operations have to be performed. The shockwave
indicator 50 may be provided with fanned and toroidal markings as a target. This makes it
possible to quantitatively detect the deviation of the focal position, which reduces the effort for
subsequent adjustments.
Brief description of the drawings
FIG. 1 is a schematic view showing a shock wave source and a coupler having a piezoelectric
crystal, FIG. 2 is a schematic view showing a shock wave source and a coupler incorporating a
PVDF sheet for capacitively extracting a measurement signal, and FIG. Fig. 4 is a schematic view
showing a coupler incorporating a PVDF sheet for extracting a measurement signal into a
galonic, and Fig. 4 is a schematic drawing showing a shock wave and a coupler incorporating a
visual shock wave indicator.
DESCRIPTION OF SYMBOLS 1 ... Shock wave source, 3 ... Shock wave generator, 5 ...
Transmission area, 7 ... Bonding membrane, 9 ... Supporter, 11 ... Coupler, 13 ... Patient, 15 ...
Shock wave sensor 17 Piezoelectric crystal 19 Lead wire 21 Measurement device 22 Central axis
30 Metal film 32 Hole 34 PVDF Sheet 36: Extraction electrode 40: Metal contact 50: Shock wave
indicator F: Focus.
Без категории
Размер файла
15 Кб
Пожаловаться на содержимое документа