JPH07184864A - Power source circuit for medical apparatus - Google Patents

Abstract

PURPOSE:To enable the suppressing of the radiation of noises or the like to an output side cable from an input side cable of a line filter accurately without increasing the number of parts. CONSTITUTION:A primary power source section 7 of an ultrasonic observing device has a power source inlet 15 receiving power from an external power source, a line filter 17 to remove noises overlapped on the external power source or the like and those going out of the apparatus, an insulation transformer 20, a terminal disc 19 and the like. By the mounting of the line filter 17 and the terminal disc 19, a fixed plate 24 is provided having isolation surfaces 26 and 27 to isolate the input side line and the output side line of the line filter 17 electrically. This constitution enables the suppression of the radiation of noises to the output side cable or the like from the input side cables 28a and 28b of the line filter 17 accurately without increasing the number of parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit of a medical device for diagnosing in vivo.

[0002]

2. Description of the Related Art In recent years, sufficient countermeasures against EMC (generically referred to as problems causing electromagnetic interference (EMI) and problems receiving electromagnetic interference (EMS)) have been taken for electric devices used in hospitals. Is an increasingly desirable situation.

Conventionally, the primary power source section of a medical diagnostic apparatus is composed of an electric component including a power inlet, a breaker, a line filter, a power switch, a terminal board, an insulating transformer, and a cable connecting the electric component. The terminal board and the terminal board are fixed to separate members or one member.

However, depending on the arrangement of the line filter and the terminal board, the cable connecting the line filter and the breaker (hereinafter referred to as the input side cable), the cable connecting the terminal board and the transformer, and the power switch and the terminal board are connected. The cable (hereinafter, referred to as the output side cable) has a structure in which it comes close to or comes in contact with the cable.

In addition to the power from the external power source, noise unnecessary for the device is also superimposed on the cable on the input side. Therefore, the cable on the output side for transmitting the noise-removed power through the line filter. Noise is radiated from the cable on the input side. This noise may be mixed in the video signal of the ultrasonic diagnostic apparatus to deteriorate the quality of the ultrasonic image, or mixed in the control signal to cause malfunction.

On the other hand, noise is radiated from the cable on the output side picking up the noise generated in the apparatus to the cable on the input side. This noise may cause malfunction of other devices.

As a countermeasure against these problems, in the conventional medical diagnostic apparatus, the cable routing is devised so that the cables on the input side and the output side do not come too close to each other, or a line filter and a terminal board are provided between the cables on the input side and the output side. A plate was provided separately from the member for fixing the to shield.

Further, Japanese Utility Model Laid-Open No. 55-76523 discloses that a connection terminal on the power input side is provided in a cover for covering the main body of the noise filter.

[0009]

By the way, when the cables are routed so that the cables on the input side and the output side of the line filter do not come too close to each other, the variation in the routing may occur depending on the operator, so the input of the line filter It was difficult to suppress the radiation of noise from the side cable to the output side cable and the radiation of noise from the output side cable of the line filter to the input side cable. In addition, if a shielding plate is separately provided between the cables on the input side and the output side, there is a problem that the number of parts increases.

The present invention has been made by paying attention to such problems, and radiates noise from an input side cable of a line filter to an output side cable and noise from an output side cable of a line filter to an input side cable. An object of the present invention is to provide a power supply circuit of a medical device capable of reliably suppressing radiation without increasing the number of parts.

[0011]

In a power supply circuit of a medical device that supplies power necessary to operate an electric circuit forming the medical device, a power inlet for receiving power from an external power source and a breaker. And a line filter that removes the noise that is superimposed on the external power supply and the noise that goes out of the device, a power switch that turns the power on and off, an insulation transformer, and a primary power supply path that connects the power inlet and the insulation transformer. A line, a terminal board that relays the primary line between the power switch and the isolation transformer, a line filter, and a fixed plate that has a surface that electrically separates the input side line and the output side line of the line filter while attaching the terminal board. By including the line filter, noise radiation from the input side cable to the output side cable of the line filter and the line filter Only radiation of noise from other output cable to the input cable without increasing the component so that it is possible to suppress the reliably.

[0012]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 and 2 relate to a first embodiment of the present invention, FIG. 1 shows the overall configuration of an ultrasonic diagnostic apparatus including the first embodiment, and FIG. 2 shows a line filter fixing structure.

An ultrasonic diagnostic apparatus 1 having a first embodiment of the present invention shown in FIG. 1 is an ultrasonic endoscope 2 which is inserted into a living body and performs ultrasonic diagnosis, and ultrasonic transmission signals and reception. An ultrasonic observing device 3 for processing a signal and a TV monitor 4 for displaying a video signal processed by the ultrasonic observing device 3.
And a keyboard 5 which is connected to the ultrasonic observation apparatus 3 and which inputs data such as a comment on an ultrasonic image displayed on the TV monitor 4.

The ultrasonic endoscope 2 is provided with a probe portion 6a accommodating a transducer for transmitting and receiving ultrasonic waves at the tip of an insertion portion 6 inserted into a living body. An illumination optical system and an observation optical system are provided in a portion adjacent to the probe portion 6a, and illumination light is supplied by connecting the light guide connector 2a at the end of the light guide cable to a light source device (not shown).

Further, the ultrasonic connector 2c at the end of the ultrasonic cable 2b extended from the ultrasonic endoscope 2 can be detachably connected to the transmission / reception connector 12 of the ultrasonic observation apparatus 3.

The ultrasonic observation apparatus 3 has a primary power supply unit 7, a secondary / patient power supply unit 8, a fan 9 for cooling the inside of the housing, a transmission circuit 10 for driving the vibrator, and a signal received by the vibrator for amplification and detection. A receiving circuit 11, a connector 12 for transmitting and receiving ultrasonic waves which is a connecting portion with the ultrasonic endoscope 2, a CPU unit 13 for controlling the timing of transmitting and receiving ultrasonic waves, and a DSC 14 for image-processing the received signals of ultrasonic waves. Composed of.

The primary power supply unit 7 forming the first embodiment is a power supply circuit for supplying power required for its operation to the secondary / patient power supply unit 8 side, and an external commercial power supply via a power cord (not shown). A power inlet 15 serving as an input terminal to which power is supplied from the breaker 16, a line filter 17 for removing noise from the power line, a power switch 18, a terminal board 1
9. An insulating transformer 20 for insulating the primary side from the secondary / patient power source side, and the power inlet 15 is connected to a breaker 16 via a cable. The breaker 16 is connected to the line filter 17 via a cable.

The line filter 17 is connected to the power switch 18 via a cable. Power switch 1
8 is connected to the terminal board 19 via a cable. The terminal board 19 is connected to the insulating transformer 20 via a cable.

The secondary / patient power supply unit 8 includes a patient power supply unit for supplying power to a part of the reception circuit 11 and the transmission circuit 10, and a CP.
It is composed of a secondary power supply unit that supplies power to the U unit 13, the DSC 14, etc. The patient power supply unit and the secondary power supply unit are connected to the insulating transformer 20 via a cable.

The transmission circuit 10 is connected to the secondary
The secondary / patient power supply unit 8 is connected to the patient power supply unit 8 and power required for operation is supplied from the secondary / patient power supply unit 8. The transmission circuit 10 is connected to the DSC 14 and the ultrasonic wave transmission / reception connector 12. The receiving circuit 11 is connected to the DSC 1 via the cable.
4. Connected to the ultrasonic transmission / reception connector 12.

The DSC 14 is connected to the transmitting circuit 10 and the receiving circuit 11 as described above, and is also connected to the CPU section 13. Also, the DSC 14 is an ultrasonic observation device 3
It is connected to the back connector 22 fixed to the back panel 21 of FIG. 2A and 2B are views showing a fixing structure of the line filter 17 in the primary power supply unit 7 in the first embodiment of the present invention. FIG. 2A is a top view and FIG. 2B is a side view of a main part. is there.

The power inlet 15 and the breaker 16 are fixed to the rear panel 21. The line filter 17 is fixed to the fixing plate 24 with screws via the insulating plate 23 from below. The terminal board 19 is fixed to the fixed plate 24 with screws from above. The fixed plate 24 has isolation surfaces 26 and 27 that isolate the line filter 17, the insulating transformer 20, and the chassis 25.

Further, the breaker 16 and the line filter 17
Input side cables 28a, 28b for connecting the power switch 18 and the terminal board 19 to the input side cables 28a, 28b
9 b and the terminal board 19 and the cables 30 a and 30 b that connect the insulating transformer 20 to each other are electrically isolated from each other, the isolation surface 26 of the fixing plate 24 on the insulating transformer 20 side extends in the vertical direction. An L-shaped plate 31 is welded to the mounting surface of the terminal board 19.

A cover 34 is provided on the upper side of the terminal board 19.
Is attached so that noise radiated from the input side cable 28a to the inside of the device is not leaked to other areas in the device or to the outside. The line filter 17 and the power switch 18 are connected by cables 35a and 35b.

Next, the operation of this embodiment will be described. When the power switch 18 is turned on, electric power is supplied from the external power source into the device through the power inlet 15. Noise unnecessary for the device may be superimposed on this electric power, and this noise is, for example, the line filter input side cable 28 connecting the line filter 17 and the breaker 16.
It is radiated into the apparatus from a and 28b.

However, the isolation surface 26 of the fixed plate 24 on the transformer 20 side, the L-shaped plate 31, the rear panel 21, the chassis 2 are provided.
By the bottom surface portion 32 and the side surface portion 33 of 5 and the cover 34,
The cables 29a, 29 for connecting the power switch 18 and the terminal board 19 to the above-mentioned input side cables 28a, 28b, etc.
b, the cables 30a and 30b for connecting the terminal board 19 and the insulation transformer 20 are electrically isolated from each other, so that the cable 2
9a, 29b, cables 30a, 30b, a cable 35 for connecting the line filter 17 and the power switch 18
No noise is radiated to a and 35b.

Since the noise superimposed on the electric power supplied from the external power source into the apparatus is removed by the line filter 17, the noise is not superimposed on the cables 35a and 35b connected to the line filter 17. Therefore,
Noise is not superimposed on the cables 29a and 29b and the cables 30a and 30b.

On the other hand, even when high-frequency noise is radiated from a board on which an IC driven by a high-frequency clock frequency such as the CPU section 13 is mounted or a cable connected to the board, the transformer 20 of the fixed plate 24 is radiated. Side isolation surface 2
6, the L-shaped plate 31, the rear panel 21, the bottom surface portion 32 and the side surface portion 33 of the chassis 25, and the cover 34 isolate the input side cables 28a, 28b from the area where noise is radiated, Side cables 28a, 28
It is not radiated to b.

Even if noise is superposed on the cables 29a, 29b, the cables 30a, 30b and the cables 35a, 35b by the radiated noise, this noise is removed by the line filter 17, so that the input side cables 28a, No noise is superimposed on 28b and the like. Therefore, noise does not appear outside the device via the power cord connected to the power inlet 15.

This embodiment has the following effects. The fixing plate 24 for fixing the line filter 17 and the terminal board 19 includes cables 28a, 28b on the input side and cables 29a, 29b, 30a, 30b, 3 on the output side of the line filter 17.
5a and 35b are isolated from each other, so that the noise superimposed on the power supplied from the external power supply into the device is
No radiation or superposition on the line filter output side cable.

Even if noise is radiated from the board inside the apparatus or the cable connected to the board, the noise is not radiated and superimposed on the cables 28a and 28b on the line filter input side, so that the noise is not transmitted to the outside of the apparatus. There is no noise.

Since noise countermeasures are determined by the shapes of the fixing plate 24 to which the line filter 17 and the terminal board 19 are attached, they can be surely taken regardless of how the person working the cables runs.

In this embodiment, the line filter 17,
The fixing plate 24 for fixing the terminal board 19 was welded to the L-shaped plate 31, but it goes without saying that the entire plate may be integrally formed.

Next, a second embodiment of the present invention will be described. Figure 3
Is a ferrite core 40 that removes noise through a cable 39 or the like connecting the transmission / reception connector 12 and the transmission circuit 10.
3A is a top view and FIG. 3B is a side view.

The ferrite core 40 is a core for a split type flat cable, and a rubber member 41 is attached to the outer periphery thereof, and a cable 39 is inserted to the inner periphery thereof. An L-shaped plate 42 is attached to the chassis 25 of the apparatus. A bush 43 made of an insulating material is inserted and fixed to the L-shaped plate 42. The band 44 covering the outer periphery of the ferrite core 40 is inserted into the band hole 45 of the bush 43 to fix the ferrite core 40 to the bush 43.

The other structure is the same as that of the first embodiment.
Next, the operation will be described. Split type ferrite core 40
The fixing method of 1 will be described with reference to FIG. First, band 44
Is inserted into the band hole 45 of the bush 43 attached to the L-shaped plate 42 to form a ring.

Next, the transmitting / receiving connector 12 and the transmitting circuit 1
Cables 39 that connect 0 to the two ferrite cores 4
Cover with 0. A rubber member 41 with double-sided adhesive paper is attached to the ferrite core 40. After passing the ferrite core 40 inside the ring of the band 44, pull the band 44 to reduce the size of the ring and deform the rubber member 41 attached to the ferrite core 40 to fix the ferrite core 40 to the L-shaped plate 42. To do.

This embodiment has the following effects. Since the ferrite core 40 is fixed by the band 44 as described above, the mounting space for the ferrite core 40 is small.

The recess 46 may be provided in the rubber member 41a attached to the ferrite core 40a as shown in FIG. 3C. By doing this, by making the recesses 46 hang on the band 44, the work of pulling the band 44 and fixing the ferrite core 40a can be performed easily.

Next, a third embodiment of the present invention will be described. Figure 4
FIG. 4 is a diagram showing a structure of a shield case 50 that shields the transmission circuit 10. The transmitter circuit 10 includes a capacitor 5
1, a circuit in which electric components such as a pulse transformer 52 and a photocoupler 53 are mounted, and outputs a signal for vibrating a vibrator to emit an ultrasonic wave.

The transmission circuit 10 is fixed to the chassis 25 via a spacer 54 made of an insulating material. A shield case 50 is fixed to the chassis 25 by a screw fixing portion 56 so as to surround the transmission circuit 10. The cable lead-out portion of the shield case 50 is provided with an opening (not shown), and this opening is as small as possible.

The other parts of the shield case 50 are in a state in which there is a small gap with the chassis 25. The shield case 50 and the transmission circuit 10 are fixed to the chassis 25, for example, at a distance defined by IEC 601-1 to ensure electrical safety. As described with reference to FIG. 3, the cable 39 that connects the transmission circuit 10 and the transmission / reception connector 12 to each other.
Is provided with a ferrite core 40. Other configurations are similar to those of the first embodiment.

Next, the operation will be described. The transmission circuit 10 is connected to the ultrasonic endoscope 2 via a transmission / reception connector 12, and a vibrator that oscillates ultrasonic waves toward the inside of a living body is provided at a tip portion of the ultrasonic endoscope 2. Has been. Therefore, when noise is radiated to the transmission circuit 10 from a circuit other than the transmission circuit 10 in the device, the noise is radiated to the outside of the device from the transducer at the tip of the ultrasonic endoscope 2 together with the ultrasonic signal. Therefore, it is necessary to take noise countermeasures.

In FIG. 4, when noise is radiated from a circuit other than the transmission circuit 10 in the apparatus, the shield case 5
Since the gap between 0 and the chassis 25 is small, noise cannot enter the inside 55 of the shield case 50. Therefore, the noise is not radiated to the transmission circuit 10. Further, most of the noise hitting the shield case 50 is absorbed by the shield case 50, becomes a slight current, and flows on the surface of the shield case 50. Since the shield case 50 and the chassis 25 are connected by the screw fixing portion 56 of the shield case 50, a current flows through the chassis 25 via the screw fixing portion 56 of the shield case 50.

Further, for example, when noise is radiated from the transmission circuit 10, since the gap between the shield case 50 and the chassis 25 is in a small state, the noise is not radiated to the outside 57 of the shield case 50.

Further, when the noise radiated from the transmission circuit 10 hits the shield case 50, most of the noise becomes a minute current, flows on the surface of the shield case 50, and passes through the screw fixing portion 56 of the shield case 50 to the chassis. Flows to 25.

As described with reference to FIG. 3, since the cable 39 that connects the transmission circuit 10 and the transmission / reception connector 12 is provided with the ferrite core 40 that removes noise from the cable 39, ultrasonic waves are transmitted through the cable 39. Noise is not radiated from the vibrator at the tip of the endoscope 2.

This embodiment has the following effects. By fixing the shield case 50 surrounding the transmission circuit 10 to the chassis 25 with screws as described above, even if noise is radiated from a circuit other than the transmission circuit 10 in the device, the transmission circuit 10 is not radiated with noise. Further, even if noise is radiated from the transmission circuit 10, the noise is not radiated to the circuits other than the transmission circuit 10 in the device.

Further, since the ferrite core 40 is provided in the cable 39 connected to the transmission circuit 10, noise is radiated to the outside of the apparatus from the vibrator at the tip of the ultrasonic endoscope 2 together with the ultrasonic signal. Not done. Therefore, the transmission circuit 10 can be reliably shielded.

Next, four examples of the present invention will be described. Figure 5
Is a shield case 60 that shields the receiving circuit 11,
It is the figure which showed the structure of 61. The receiving circuit 11 is screwed to the front panel 64 via spacers 62 and 63 made of an electrically conductive material such as metal. Shield cases 60 and 61 are fastened to the upper and lower sides of the receiving circuit 11 together with a spacer 63 so as to cover the receiving circuit 11.

The spacers 62 and 63, the contact portions and the shield cases 60 and 61, and the contact surface of the receiving circuit 11 are GND lands.

A cable 65 connected to the transmitting / receiving connector 12 is connected to the left side of the receiving circuit 11. A cable 66 connected to the DSC 14 is connected to the right side of the receiving circuit 11. The cables 65 and 66 are provided with ferrite cores 67a and 67b for removing noise.

An opening 68 is provided in the cable lead-out portion of the shield case 60, and the opening 68 is as small as possible. The other parts of the shield case 60 are in a state where there is a small gap with the shield case 61. Other configurations are similar to those of the first embodiment.

Next, the operation will be described. The receiving circuit 11 is a circuit that amplifies and detects a signal received by the transducer, and processes a weak received signal. Therefore, when noise is radiated, noise is superimposed on the image signal to be processed by amplification. Therefore, noise appears on the image, which is not preferable for diagnosis. Therefore, it is necessary to take measures against noise.

In FIG. 5, when noise is radiated from circuits other than the receiving circuit 11 in the apparatus, the shield case 6
Since the gap between 0 and the shield case 61 is small, the portion 6 covered by the shield cases 60 and 61 is
Noise cannot enter the 9,70. Therefore, the receiving circuit 1
No noise is radiated to 1.

Further, most of the noise hitting the shield case 60 and the shield case 61 is the shield case 6.
Shielded case 6
1, 61 surface. Since the shield cases 60 and 61 are fastened together at the spacer 63 and the spacer 63 and the front panel 64 are connected to each other, a current flows to the front panel 64 through the spacer 63 and the chassis 25 (not shown) is connected. Flows to the chassis 25 through the section.

Further, for example, when noise is radiated from the receiving circuit 11, the shield case 60 and the shield case 6
Since the gap between the shield cases 60 and 61 is small, noise is not radiated to the outside of the shield cases 60 and 61.

Further, when the noise radiated from the receiving circuit 11 hits the shield cases 60, 61, most of the noise becomes a small current, and the shield cases 60, 61
The current flows through the front surface of the front panel 64 through the spacer 63 portion where the shield cases 60 and 61 are fastened together.
Flow to the chassis 25 via a connection part of the chassis 25 (not shown).

A ferrite core 6 for removing noise is provided on the cable 66 connected to the receiving circuit 11 and the DSC 14 and the cable 65 connected to the transmitting / receiving connector 12.
Since 7a and 67b are provided, no noise is superposed via the cables 65 and 66 connected to the receiving circuit 11.

The effects of this embodiment are as follows. As described above, the shield case 6 surrounding the receiving circuit 11
A spacer 62 in which 0 and 61 are connected to a front panel 64,
Even if noise is radiated from a circuit other than the receiving circuit 11 in the device, the receiving circuit 1 can be tightened together at the portion 63.
No noise is radiated to 1.

Even if noise is radiated from the receiving circuit 11, no noise is radiated to circuits other than the receiving circuit 11 in the apparatus. Further, the cable 6 connected to the receiving circuit 11
Since the ferrite cores 67a and 67b are provided on the cables 5 and 66, no noise is superposed through the cables 65 and 66. Therefore, the reception circuit 11 can be shielded reliably.

Although the ultrasonic diagnostic apparatus has been described as the medical apparatus in the above description of the embodiments, it can be similarly applied to other medical apparatuses and also to the power supply circuit in the case of the medical apparatus. The same applies.

[0063]

As described above, according to the present invention, the radiation of noise from the input side cable of the line filter to the output side cable and the radiation of noise from the output side cable of the line filter to the input side cable are parts. It can be reliably suppressed without increasing.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an ultrasonic diagnostic apparatus including a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration near a line filter in an ultrasonic observation apparatus.

FIG. 3 is a diagram showing a ferrite core mounting structure according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a structure in the vicinity of a shield case that shields a transmission circuit according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a structure in the vicinity of a shield case that shields a receiving circuit according to a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ultrasonic diagnostic device 2 ... Ultrasonic endoscope 3 ... Ultrasonic observation device 4 ... TV monitor 5 ... Keyboard 6 ... Insertion part 7 ... Primary power supply part 8 ... Secondary / patient power supply part 10 ... Transmission circuit 11 ... Reception Circuit 12 ... Transmission / reception connector 13 ... CPU section 14 ... DSC 15 ... Power supply inlet 16 ... Breaker 17 ... Line filter 18 ... Power switch 19 ... Terminal board 20 ... Insulation transformer 21 ... Rear panel 24 ... Fixing plate 25 ... Chassis 26, 27 ... Separation surface 28a, 28b ... Input side cable 29a, 29b, 30a, 30b, 35a, 35b ... Cable 31 ... L-shaped plate

Claims (1)

[Claims] 1. A power supply circuit for a medical device, which supplies power required to operate an electric circuit forming the medical device, includes a power inlet for receiving power from an external power supply, a breaker, an external power supply, and the like. A line filter that removes superimposed noise and noise that goes out of the device, a power switch that turns the power on and off, an isolation transformer, a primary line that serves as a power supply path to the power inlet and the isolation transformer, and a power switch. A terminal board for relaying the primary line between the insulating transformers, a line filter, and a fixing plate having a surface for electrically connecting the terminal board and electrically separating the input side line and the output side line of the line filter are provided. Power supply circuit for medical equipment.