JPS6049502B2 - Laser beam double shutter of laser scalpel device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser beam shutter for a laser scalpel device.

In a laser scalpel device, it is most important that the opening and closing operations of the beam shutter are reliable.

Since the laser scalpel device is used for medical purposes,
If the operator thinks that the laser beam is blocked and prepares for medical treatment, but the laser beam is emitted from the handpiece, this could lead to a serious accident. Therefore, safety of beam shutters is strongly desired.
SUMMARY OF THE INVENTION An object of the present invention is to provide a laser beam shutter whose safety is dramatically improved and which allows even an inexperienced person to operate the shutter with peace of mind.

The laser beam heavy shutter of the laser scalpel device of the present invention is provided in the laser beam path from the laser generation source in the order of the main shutter and the auxiliary shutter, and consists of the main shutter and the auxiliary shutter that are opened and closed simultaneously or with a time difference, and both shutters An auxiliary power supply circuit is provided that has a normally closed switch (normally closed) that operates in synchronization with the normally open switch (normally open) provided in the drive circuit that operates the laser beam, and that operates in the opposite direction. The output of the detection element that receives the laser reflected light is guided to the power monitor, and the output of the detection element that receives the laser reflected light from the auxiliary shutter is input to the AND circuit together with the auxiliary power signal, and the output ON signal from the ANDR circuit is used. The laser power is turned off.

In a preferred embodiment of the double shutter of the present invention,
There are two normally open switches provided in the dual shutter drive circuit.

In another preferred embodiment of the dual shutter of the invention, a check drive circuit is provided which has a separate trigger switch that operates only the main shutter.

EMBODIMENT OF THE INVENTION Hereinafter, the double shutter of this invention will be explained based on the block diagram which shows an Example.

In FIG. 1, 3 is a laser tube.

A high-voltage current for laser generation from the laser high-voltage power supply 2 is sent to the laser tube 3, and a laser beam is emitted and sent toward the hand piece 4. A main shutter 5 and an auxiliary shutter 6 are provided in the laser beam path in this order from the laser tube 3 to the main shutter 5 and the auxiliary shutter 6. 1 is a commercial power supply input to the laser high voltage power supply; S
W is a high voltage current on/off switch.

Switch H. When the SW is turned on, a laser generating current flows through the laser tube 3 under normal conditions and a laser beam is generated. A circuit from a shutter drive power source 7 for simultaneously operating the main shutter 5 and auxiliary shutter 6 is provided, and this circuit includes manual and foot-operated normally open switches SWl and S.
W2 is provided.

A check drive circuit having a check switch C-SW for operating only the main shutter 5 is separately provided between the main shutter 5 and the drive power source 7. 8 is an auxiliary power source.

In the circuit from the auxiliary power supply 8 to the input side of the andro circuit 9,
Normally closed switches A-SW1 and A.SW2 are provided which operate in synchronization with the manual switch SW1 and the foot switch SW2, respectively, and in reverse. The laser reflected light from the main shutter 5 is received by the detection element 10,
The output of the detection element 10 is input to a monitor 11.

The laser and reflected light from the auxiliary shutter 6 are received by the auxiliary detection element 12, and the output of the auxiliary detection element 12 is input to the AND circuit 9. The AND circuit 9 produces an output only when both the auxiliary power supply 8 and the detection element 12 receive outputs. The output of the AND circuit 9 is input to the inverter 13, and the invert! The motor 13 operates on the laser power supply 2 to turn off the laser current. Reference numeral 14 denotes an alarm device activated by the output of the AND circuit 9.

During normal operation, the switch H◆SW of the commercial power supply 1 is turned on, a laser beam is generated from the laser tube 3, the laser beam is blocked by the main shutter 5, the reflected laser beam is monitored by the monitor 11 through the detection element 10, and the auxiliary shutter is The laser beam does not reach handpiece 6 (of course, the laser beam does not reach handpiece 4.

), the auxiliary detection element 12 receives no light, and therefore there is no output from the auxiliary detection element 12. Further, since the switch A4-SWl from the auxiliary power supply 8 is a normally closed switch, the auxiliary power supply signal is input to the AND circuit 9. However, since the signal from the auxiliary detection element 12 is not input to the AND circuit 9, there is no output from the AND circuit 9, and the current for laser generation by the laser high voltage power supply 2 is not cut off. If there is light leakage from the main shutter 5 due to a malfunction of the main shutter 5 or a misalignment of the optical axis, or even though the main shutter 5 should have been closed (i.e., SWl and SW2 are open and the A-S
(Wl, A-SW2 are closed) If it is not actually closed, the auxiliary detection element 12 receives the reflected light from the auxiliary shutter 6, and its output is input to the AND circuit 9, and the output from the auxiliary power supply 8 is input to the AND circuit 9. Since the output is also input to the AND circuit 9, an ON signal is input from the AND circuit 9 to the inverter 13, the laser power is turned off, and the alarm buzzer 14 issues an alarm.

In this way, if the function of the main shutter 5 is defective, the generation of laser light is immediately stopped, so it is safe.

In addition, in order to check the function of the auxiliary shutter 6, turn on the check switch C-SW of the check drive circuit, the main shutter 5 opens, the laser beam is blocked by the auxiliary shutter 6, and is received by the auxiliary detection element 12. The output of the element 12 is input to the AND circuit 9, which is confirmed by the alarm buzzer 14 sounding and the laser power being cut off. Table 1 shows all the combinations when the auxiliary power supply signal and the auxiliary detection element signal are on and off. No. 1 in Table 1. The failure of the auxiliary shutter in step 4 was confirmed by the fact that the laser light did not reach the handpiece, and there was no safety problem.

A similar failure of the main shutter can be confirmed on the monitor 11.
In order to open and close the main shutter 5 and the auxiliary shutter 6 with a time difference, well-known means such as providing a timer on one of them may be used.

The device of the present invention has double shutters, and the probability that the two shutters will fail at the same time is extremely low, resulting in extremely high safety.

Furthermore, the apparatus of the present invention has a means of immediately detecting failure of the main shutter and immediately stopping the generation of the laser beam, thereby dramatically increasing safety. It also has a means to confirm the normal operation of the auxiliary shutter, increasing safety. Furthermore, in the device of the present invention, the shutter drive circuit is provided with two switches SW2, SW2, for example, a foot switch and a hand switch, so it is safe because the beam shutter will not open unless both hands and feet are used to confirm and turn both on. This allows even inexperienced users to operate the shutter with confidence.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a dual shutter embodiment of the present invention. 1... Commercial power supply, 2... Loser high voltage power supply, 3... Loser tube, 4... Hand piece, 5... Main shutter, 6... ...Auxiliary shutter, 7...Shutter drive power supply, 8...
Auxiliary power supply, 9...AND circuit, 10...
Detection element, 11...Monitor, 12...
Auxiliary detection element, 13... Inverter, 14...
...Alarm device, H-SW...High voltage power switch, SWl, SW2...Shutter drive circuit normally open switch, A-SWl, A-SW2...
...Auxiliary power circuit normally closed switch.

Claims (1)

[Claims] 1. A main shutter and an auxiliary shutter are provided in the laser beam path of the laser scalpel device in this order from the laser source,
It consists of a main shutter and an auxiliary shutter that are opened and closed at the same time or with a time difference, and is provided with an auxiliary power supply circuit that has a normally open switch that operates in synchronization with and in reverse to the normally open switch provided in the drive circuit that operates both shutters. The output of the detection element that receives the laser reflected light from the main shutter when the laser beam is cut off is guided to the power monitor, and the output of the detection element that receives the laser reflected light from the auxiliary shutter is sent to the ANDRO circuit together with the auxiliary power signal. The laser beam double shutter of the laser scalpel device is designed to turn off the laser power by inputting the input signal and turning on the output signal from the ANDRO circuit. 2. The laser beam double shutter according to claim 1, wherein the double shutter drive circuit has two normally open switches. 3. A laser beam double shutter according to claim 1 or 2, which is further provided with a check drive circuit having a check switch that operates only the main shutter.