GB2261127A - Electric field therapy apparatus - Google Patents
Electric field therapy apparatus Download PDFInfo
- Publication number
- GB2261127A GB2261127A GB9222122A GB9222122A GB2261127A GB 2261127 A GB2261127 A GB 2261127A GB 9222122 A GB9222122 A GB 9222122A GB 9222122 A GB9222122 A GB 9222122A GB 2261127 A GB2261127 A GB 2261127A
- Authority
- GB
- United Kingdom
- Prior art keywords
- value
- electric field
- therapy apparatus
- field therapy
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005684 electric field Effects 0.000 title claims abstract description 39
- 238000002560 therapeutic procedure Methods 0.000 title claims abstract description 39
- 230000001419 dependent effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 231100001261 hazardous Toxicity 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 101100508840 Daucus carota INV3 gene Proteins 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 101150110971 CIN7 gene Proteins 0.000 description 1
- 101100286980 Daucus carota INV2 gene Proteins 0.000 description 1
- 101150110298 INV1 gene Proteins 0.000 description 1
- 101100397044 Xenopus laevis invs-a gene Proteins 0.000 description 1
- 101100397045 Xenopus laevis invs-b gene Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/40—Applying electric fields by inductive or capacitive coupling ; Applying radio-frequency signals
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/20—Applying electric currents by contact electrodes continuous direct currents
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
Abstract
An electric field therapy apparatus comprises an overload detecting circuit 21 which compares (COMP) a voltage VD dependent on the output current with a reference VR dependent on the supply voltage. The result drives an indicator (LED) and/or a relay Ry2. possibly via a time delay 22. <IMAGE>
Description
ELECTRIC FIELD TliERAl'Y APPARATUS BACKGROUND OF X r x I .\VE\T ION [Field of the Invention ]
This invention relates to an electric field therapy apparatus for performing a medical treatment utilizing a high voltage.
[Description of the Prior Art)
Fig. 1 is a perspective view of a conventional electric field therapy apparatus A in the state of normal use. The numeral 1 denotes a main body of the electric field therapy apparatus A, 2, a high voltage output terminal of the main body 1, 3, a high voltage-proof cord, and 4, an electric conductive element, respectively. The electric conductive element 4 comprises an electrode 4a to which a high voltage is applied from the main body 1, an insulating element 4b covering the marginal area of the surface of the electrode 4a, and insulating pieces 4b' for insulating the whole electric conductive element 4 from the floor. The numeral 5 denotes a chair, 5a, insulating devices for insulating the chair 5 from the floor, and 6, a human body subjected to medical treatment, respectively.In other words, the electric field therapy apparatus A comprises, in a rough classification, the main body 1 of the electric field therapy apparatus A and its high voltage output terminal 2, and a load portion 1 (high V()l tage-proof cord 3, electric conductive element 4, chair 5, and human body 6).
For using this electric field therapy apparatus A, a part (for example, feet) of the human body 6 who sits on the chair 5 insulated from the floor (ground) by the insulating devices 5a is contacted onto the electric conductive element 4 which is covered with the insulating element 4b, and a high electric field is applied to the human body 6.
Fig. 2 shows a basic circuit of the electric field therapy apparatus A (including a safety device B) of Fig. 1, and identical reference numerals as those of Fig. 1 denote identical parts. The reference numeral 7 denotes a commercial power source, and 8, an output stopping relay contact, 9, an over current detection circuit for detecting an over current in order to immediately turn off the output stopping relay contact 8. This means that the output stopping relay contact 8 and the over current detection circuit 9 constitute the circuit of the safety device B in the electric field therapy apparatus A. The numeral 10 denotes a step-up transformer, and 11, a current limiting resistance.
In the safety device B of the above conventional electric field therapy apparatus A, when electric current more than a preset (to fix to a prescribed value) value flows to a secondary circuit of the step-up transformer 10, this over current is d(Evecte(i by C' I ed b)' I The over current detection circuit ne##ciii 9,and Ithe output stopping relay contact 8 is turned off to stop stop the output.However in the Ssafety fCtydevice ss if Such cunven- tonal clcctric field therapy apparatus A as mentioned, since the over current is detected comparing the preset current value with the secondary current of the stepup transformer 10, the preset current value is not changed even if voltage of the power source is fluctuated. Therefore, there is such a problem that for the sake of safety, the current value must be preset taking into consideration the expected fluctuation.
In an ideal safety device B, it is of course required not to supply a hazardous over current to the human body 6 in view of the medical treatment in which a high voltage is applied to the human body 6. Furthermore, it is required to provide a (safety) circuit which is actuated before the over current is actually occurred anticipating that a hazardous states will be created when the value of a load generating from the load portion L becomes more than a load (hereinafter referred to as the "preset load") supposed to be hazardous even if the current value is less than the preset value, in other words, a possibility that a hazardous current is applied to the human body 6. The actuating point must be determined only by the value of the preset load. At that time, any possible effect of the voltage fluctuation of the power source must be avoided as much as possible.
li g . 3 is an equivalent circuit diagram showing the stale t,f it liy of of Fig.2 The reference character denotes an input voltage of the commercial pci we r Si. (IC' 7 , V a secondary voltage of the set-up transformer 10, V, an output voltage, IO, an output current, R, a resistance value of the current limiting resistance 11, C, a load electrostatic capacity value when the load is entirely electrostatic capacity, and RL, a load resistance value when the load is entirely resistance, respectively. Table 1 shows the results of calculation based on the equations (1) and (2) below.The results show how the resistance value for actuating the over current detection circuit 9 is changed when the input voltage Vi is varied by + 10% under the conditions that the commercial power source 7 is: Vi=100V, 50 Hz, no-load output voltage: V0=l0000V, current limiting resistance R is: a fixed value of 101XQ , and preset value (actuating current) of the over current detection circuit 9: 500p A.
In the case where the load is entirely resistance:
V
RL = - - R ................... (1)
In the case where the load is entirely electrostatic
capacity:
wherein: U =2s f
Table 1
Input Secondary Output Actuating Actuating Actuating voltage voltage V current current load load lo preset resistance electro value value R,' static capacity value C' (V) (V) A) ( A) (MQ ) ) (pF) (C=0) (R= ) 110 1 11000 500 500 12.0 162 Qo 100 i 10000 500 500 10.0 184 o 90 9000 500 500 8.0 213 TABLE 2
Input Secondary Output Actuating Load Load voltage voltage V current current resistance electro Vi lo value preset static value RL capacity preset value C" (V) (V) 1 A) (y A) (MQ ) (pF) (C=0) (Rr=" > ) 110 11000 550 500 j leo.0 184 100 leo000 500 500 10.0 184 Qo 90 9000 450 500 10.0 184 x TABLE 3
Input Secondary Output Actuating Load Load voltage voltage V current current resistance electro value preset static value capacity preset value C" (V) (V) (y A) (F A) (MQ ) (pF) (C=0) (R= ) 110 11000 450 450 1 14.4 143 100 10000 450 450 12.2 160 Oo 90 9000 450 450 10.0 184 Qo In Tables 1, 2, 3 and Table 4 (as will be described), the mark t indicates that the safety device B and another safety device B' (as will be described) according to the present invention are actuated, while the mark x indicates that the device B is not actuated.
As apparent from the calculated values of Table 1, in the safety device B of the conventional electric field therapy apparatus A, the load values (values of the actuating load resistance value RL of Table 1) are varied in accordance with variation of the input voltage Vj, and even if the load resistance preset value R#", as apparent from Table 2, is set in such a manner as to be actuated at 10MQ (Io=500S A), the circuit of the safety device B is not actuated at 10M Q of the load resistance value RL when the voltage of the power source is lowered to 90V.In order to enable the circuit of the safety device B to be actuated at the preset value of lOMQ of the load resistance value RL even when the input voltage Vt is 90V, it was required that as shown in
Table 3, the preset value of the load is set to be smaller than a desired value, i.e., the value of the load resistance preset value R" is required to be set large (12.2my of
Table 3), and the actuating current value is required to be set small (450 A of Table 3). In this case, the circuit of the safety device ought to be actuated when the value of the actuating load resistance value RL' becomes less than 10M but it is actuated at 12.2my of Table 3.In the case there the safety device B is set to be actuated at 10V of the input voltage V and 1lOMQ of the actuating load resistance value LI in Table he tIe safety device B is not ac- bated unless the actuating load resistance value R.' is lowered to.8M# when the input voltage Vl is lowered to 90V.
When the sensitivity of the circuit of the safety device
B of the electric field therapy apparatus A is increased (the value of the load resistance preset value RLII is set to be large, that is, the actuating current is set to be small), there is a possibility that the output is stopped even at an temporary increase which is simply generated when the human body 6 is loaded onto and unloaded from the electric conductive element 4. When this happens, the user may mistake it for failure (of the apparatus). In order to avoid this unfavorable situation, the sensitivity of the circuit of this safety device B must be kept lowered to some extent.
SUMMARY OF THE INVENTION
This invention relates to an electric field therapy apparatus for performing a medical treatment utilizing a high voltage, in which an over load of its output circuit is detected and informed, an output is stopped, and means relating to safety is actuated.
An electric field therapy apparatus according to the present invention comprises an over load detecting circuit including a detected value generating portion for setting a reference value in proportion to an input voltage inputted from a power source into a main body of the electric field therapy apparatus and generating a detected value in proportion to electric current of an output circuit of the main body, and a comparator for inputting the reference value and the detected value, the over load detecting circuit generating a control output from the comparator when the detected value inputted into the comparator becomes more than the reference value, safety means such as alarming means and output stopping means being actuated by this output signal, the safety means being actuated only when the detected value continuously exceeds the reference value for a predetermined time.
It is therefore an object of the present invention to provide an electric field therapy apparatus having a safety device which is normally actuated at a constant load value by varying a reference value in accordance with variation, if any, of voltage of a power source.
Another object of the present invention is to provide an electric field therapy apparatus having a safety circuit for generating a control output from a comparator when a detected value inputted into the comparator becomes more than a reference value.
A further object of the present invention is to provide an electric f i C Id therapy apparatus having a safety circuit for generating a control output from a comparator so that a safety means such as alarming means and output stopping means are actuated in accordance with this output signal.
A still further object of the present invention is to provide an electric field therapy apparatus having a safety circuit for actuating a safety means only when a detected value continuously exceeds a reference value for a predetermined time.
These objects can be achieved by a constitution of an electric field therapy apparatus and its circuit constituting the present invention. Specific embodiments of the invention are exemplified in the accompanying drawings and the detailed description to follow. It is to be understood that minor rectifications and modifications of these embodiments are also included in the scope of the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view schematically showing a conventional electric field therapy apparatus;
Fig. 2 is a schematic view showing a basic circuit of a safety device of the electric field therapy apparatus of Fig.
1;
Fig. 3 is an equivalent circuit diagram showing the state of load of Fig. 2;
Fig. 4 is a schematic view of an electric field therapy apparatus and its circuit diagram, according to one embodiment of the present invention;
Fig. 5 is a waveform diagram showing an activating state of the circuit of Fig. 4; and
Fig. 6 is schematic view of an electric field therapy apparatus and its circuit diagram, according to another embodiment of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Fig. 4 shows an electric field therapy apparatus A' of the present invention and its circuit diagram. In Fig. 4, identical reference numerals as those of Fig. 1 denote identical parts. The reference character X1 denotes a relay contact for holding a power source, X2, a relay contact for stopping output, and Ry1, a relay operating coil for holding a power source, respectively. The numeral 20 denotes a safety circuit constituting a safety device B'. The safety circuit 20 comprises an over load detecting circuit 21, a timer circuit 22, and an operating circuit 23.
The over load detecting circuit 21 comprises a reference value generating portion 21a including a diode D1 for generating a reference value VR in proportion to voltage of the power source, a smooth condenser C1 and partial pressure resistors R1 and Rp, and a detected value generating portion 21b including a converting resistors R3 for converting an output current to a voltage, and a diode D2 for converting a converted voltage to a half-wave detected value VD, and a comparator COMP for comparing the detected value VD with the reference value VR and generating a positive voltage at the output side when the detected value VD becomes more than the reference value VR.
The timer circuit 22 comprises two monostable multivibrators including NOR gates G1, G2, inverters INV1, INV2, and INV3, etc.
The operating circuit 23 comprises a NAND gate G3, a light emitting diode LED, and an output stopping relay operating coil Ry2 of an output stopping relay contact X2.
The numeral 12 denotes a power switch. The reference characters C2 and C3 denote condensers, and R4, R5 and Ro, resistors, respectively. A power circuit of the safety circuit 20 is not shown.
Fig. 5 is a main waveform diagram in the circuit diagram of Fig. 4. The reference characters VR, VD, and (a) through (d) correspond to voltages at positions indicated by VR, VD, and a through d of Fig. 4, respectively.
Operation of the embodiment of Fig. 4 will now be described with reference to Fig. 5. First, when the power switch 12 is pressed, electric current flows to the power source holding relay operating coil Ryl to close the power source holding relay contact Xl. This closing state is maintained even if the power switch 12 is released. By this, a high voltage is generated to the output of the main body 1 of the electric field therapy apparatus to start the medical treatment with respect to the human body 6 placed on the electric conductive element 4.
At this time, when the state of the load portion L is changed by some reasons (change in temperature and moisture, accumulation of dust and the like, failure of the electric field therapy apparatus, insufficient insulation of the apparatus, etc.) and the value of the load becomes larger than the preset value (the detected value VD of the comparator
COMP becomes larger than the reference value V.
Hereinafter, this state is referred to as the "abnormal state"), since the voltage at the point indica-ted by a on the output terminal side of the comparator COMP becomes a positive voltage as shown by a waveform (a), the light emitting diode LED of the operating circuit 23 is lighted up. Further, since the output of the COMP is inputted directly into the NOR gate G1, a pulse having a width of a time constant T1 determined by the resistor R4 and the condenser C2 appears on the output terminal side of the inverter 1NV1 in such a manner as to be in synchronism with a leading edge of the waveform (a).The waveform thus appeared is inverted to a waveform (b) by the inverter lNV2. By inputting the waveform (b) into the NOR gate Gn, a pulse having a width of a time constant T2 determined by the resistor R5 and the con denser C3 appears on the output terminal side of the inverter
INV3, as shown by the waveform (c), in such a manner as to be in synchronism with a leading edge of the waveform (b), and it is then inputted into NAND gate Gs. When the aforementioned abnormal state occurs here during the time when the input terminal of the NAND gate G3 is maintained to be a positive voltage by the pulse waveform (c), the output of the
NAND gate G3 becomes zero as shown by the waveform (d).
Therefore, electric current is supplied to the output stopping relay operating coil Ry2. As a result, the output stopping relay contact X2 is opened, electric current to the power source holding relay operating coil Ryi is cut off, the power source holding relay contact X1 is opened, and the output of the electric field therapy apparatus A is stopped.
At this time, as shown in Table 4, if the voltage of the power source is varied, the output current Io is changed and at the same time, the reference value VR is also changed to change (or correct) the actuating current value. Therefore, the device is actuated normally at a constant load value (preset load value). Accordingly, in the safety device B' of the electric field therapy apparatus A' of the present invention, the operating state is never changed, as in the safety device B of the conventional electric field therapy apparatus A, when the voltage of the power source is changed even if the load remains constant.
TABLE 4
Input Secondary Output Actuating Load Load voltage voltage V current current resistance electro Ic it value preset static value R" capacity preset value C" (V) (V) (y A) (y A) (MQ ) (pF) (C=O) (R= ) 110 11000 550 550 10.0 184 o 100 10000 1 500 500 10.0 184 o 90 9000 450 450 10.0 184 In the above embodiment, the voltage value is used for the reference value VR and the detected value VD. However, it may be other physical value such as, for example, electric current value, temperature value, light quantity value and the like.
Fig. 6 shows one embodiment in which a timer function with an integrating circuit 21c is used at the input step of the comparator COMP. R7 denotes an integrating resistor, and Cq denotes an integrating condenser. Identical reference numerals as those of Fig. 4 denote identical parts.
In this embodiment, even if the current flowing to the output circuit is increased by some reasons as mentioned above and the detected value VD exceeds the reference value
VR, the output side of the integrating circuit 21c does not become that voltage soon. Instead, it becomes for the first time the same voltage as the detected value VD only after the passage of the time constant which is determined by the integrating resistor R, and the integrating condenser C4. An output is outputted from the comparator COMP to light up the light emitting diode LED of the operating circuit 23. At the same time, electric current is supplied to the output stopping relay operating coil Ry, to open the output stopping relay contact X2.As a result, the electric current to the power source holding relay operating coil Ry1 is cut off to open the power source holding relay contact X1. As a consequence, the output of the electric field therapy apparatus
A' is stopped. At this time, if the detected value VD is lowered less than the reference value VR before the output is outputted from the comparator COMP, the output is not outputted. Accordingly, the operating circuit 23 is not actuated, and the light emitting diode LED is not lighted up, and the output is not stopped.
In the embodiment of Fig. 4, although the operating circuit 23 is actuated through the timer circuit 22, the operating circuit 23 may be actuated directly by the output of the over load detecting circuit 21 and not by way of the timer circuit 22.
In the electric field therapy apparatus of the present invention, when the detected value is varied in accordance with variation of the voltage of the power source, the reference value of the comparator is also varied in proportion to the voltage of the power source. Accordingly, the safety device is not actuated even if the voltage of the power source is varied, as long as the load is present within a normal range. In other words, it is not affected by variation of the voltage of the power source and always actuated by a preset load. If it is set to be actuated only when the abnormal state is maintained more than a predetermined time, it is not actuated by a temporary increase of load which is simply generated when the patient is loaded on and unloaded from the electric conductive element. Therefore, the patient will never mistake it for a failure of the apparatus.
Claims (4)
1. An electric field therapy apparatus comprising an over load detecting circuit including a reference value generating portion for generating a reference value in proportion to an electrical signal input from a power source into a main body of the electric field therapy apparatus, a detected value generating portion for generating a detected value in proportion to electric signal from an output circuit of said main body, and a comparator for receiving the reference value and the detected value, said over load detecting circuit generating a control output from said comparator when the detected value inputted into said comparator becomes more than said reference value.
2. An electric field therapy apparatus as claimed in claim 1, further comprising safety means, such as alarming means and output stopping means, which is actuated by the control output generated from said comparator.
3. An electric field therapy apparatus as claimed in claim 1, further comprising a timer circuit for outputting a control output only when the detected value continuously exceeds the reference value for a predetermined time or more.
4. An electric field therapy apparatus substantially as hereinbefore described with reference to and as shown in Figures 4 and 5, or Figure 6 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991097174U JP2517276Y2 (en) | 1991-10-31 | 1991-10-31 | Potential therapy device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9222122D0 GB9222122D0 (en) | 1992-12-02 |
| GB2261127A true GB2261127A (en) | 1993-05-05 |
| GB2261127B GB2261127B (en) | 1995-08-30 |
Family
ID=14185226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9222122A Expired - Fee Related GB2261127B (en) | 1991-10-31 | 1992-10-21 | Overload detecting circuit and electric field therapy apparatus comprising same |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP2517276Y2 (en) |
| KR (1) | KR950008025B1 (en) |
| CN (1) | CN1038228C (en) |
| GB (1) | GB2261127B (en) |
| HK (1) | HK48796A (en) |
| TW (1) | TW224945B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001024338A1 (en) * | 1999-09-30 | 2001-04-05 | Siemens Aktiengesellschaft | Method for operating a circuit-breaker |
| EP1216725A2 (en) * | 2000-12-18 | 2002-06-26 | Hakuju Institute for Health Science Co., Ltd | Electric potential therapy apparatus and control method of optimal dose amount for human body area |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100470423B1 (en) * | 1998-04-14 | 2005-04-08 | 가부시끼가이샤 마루타카 | Overcurrent Protection Device for Potential Therapy |
| JP4467263B2 (en) * | 2002-09-20 | 2010-05-26 | 日本精密測器株式会社 | Electronic device for health index measurement and control method thereof |
| CN109847940B (en) * | 2019-01-23 | 2020-06-19 | 佛山市明伟达智能科技有限公司 | Electrostatic oil fume purification driving power supply |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB693838A (en) * | 1950-08-28 | 1953-07-08 | Everett Clifton Brill | Electric protective devices |
| GB1594021A (en) * | 1976-09-27 | 1981-07-30 | Westinghouse Electric Corp | People-protecting ground fault circuit interrupter |
| EP0269846A1 (en) * | 1986-11-07 | 1988-06-08 | Siemens Aktiengesellschaft | Stimulator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85205638U (en) * | 1985-12-28 | 1987-02-04 | 河北师范大学科技开发中心 | Music and electronic synchronous therapeutic instrumetn |
| CN86210208U (en) * | 1986-12-20 | 1987-12-12 | 航天部七○一所 | Rdc thermal electronic and magnetic therapeutic device |
| CN2030091U (en) * | 1987-10-24 | 1989-01-04 | 开封陆军一五五医院 | Hemiplegia cure instrument |
| CN1051512A (en) * | 1990-11-23 | 1991-05-22 | 葛义 | Meridian acupuncture and massage therapeutic equipment |
-
1991
- 1991-10-31 JP JP1991097174U patent/JP2517276Y2/en not_active Expired - Lifetime
-
1992
- 1992-10-01 TW TW081107812A patent/TW224945B/zh active
- 1992-10-10 KR KR1019920018632A patent/KR950008025B1/en not_active IP Right Cessation
- 1992-10-21 GB GB9222122A patent/GB2261127B/en not_active Expired - Fee Related
- 1992-10-30 CN CN92112587A patent/CN1038228C/en not_active Expired - Fee Related
-
1996
- 1996-03-21 HK HK48796A patent/HK48796A/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB693838A (en) * | 1950-08-28 | 1953-07-08 | Everett Clifton Brill | Electric protective devices |
| GB1594021A (en) * | 1976-09-27 | 1981-07-30 | Westinghouse Electric Corp | People-protecting ground fault circuit interrupter |
| EP0269846A1 (en) * | 1986-11-07 | 1988-06-08 | Siemens Aktiengesellschaft | Stimulator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001024338A1 (en) * | 1999-09-30 | 2001-04-05 | Siemens Aktiengesellschaft | Method for operating a circuit-breaker |
| EP1216725A2 (en) * | 2000-12-18 | 2002-06-26 | Hakuju Institute for Health Science Co., Ltd | Electric potential therapy apparatus and control method of optimal dose amount for human body area |
| EP1216725A3 (en) * | 2000-12-18 | 2002-11-20 | Hakuju Institute for Health Science Co., Ltd | Electric potential therapy apparatus and control method of optimal dose amount for human body area |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1038228C (en) | 1998-05-06 |
| HK48796A (en) | 1996-03-29 |
| GB2261127B (en) | 1995-08-30 |
| JPH0539555U (en) | 1993-05-28 |
| JP2517276Y2 (en) | 1996-11-20 |
| CN1073368A (en) | 1993-06-23 |
| KR930007470A (en) | 1993-05-20 |
| TW224945B (en) | 1994-06-11 |
| KR950008025B1 (en) | 1995-07-24 |
| GB9222122D0 (en) | 1992-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20051021 |