JPH0347249A - Operating apparatus for surgery - Google Patents

Abstract

PURPOSE:To prevent a holding part from superheat and to make it possible to use safely an operating apparatus for surgery by stopping to supply electric power to a motor in the holding part when temp. reaches a specified second temp. higher than the first temp. CONSTITUTION:When an electric current I is fed to a temp. measuring element 28 from a source 74 for a const. electric current, a voltage R.I is generated between both ends of the temp. measuring element 28 by the resistance R of the temp. measuring element 28. This generated electric voltage is converted to a digital signal by means of A/D transformers 76 and 76 and it is input to a control circuit 61 as a temp. information. Then, when the control circuit 61 detects a specified first temp. from a temp. information, an alarm LED 35 on a front panel is turned on and off or on and when a specified second temp. higher than the first temp. is detected, an electric power supply to a motor 22 is stopped through a D/A transformer 63. Superheat of a holding part is prevented thereby and it is possible to use it safely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a surgical device for resecting tumors, cartilage, etc. in knee joints and the like.

[Prior Art] Conventionally, joint surgery to remove, for example, a tumor on the patella or damaged cartilage, bone, etc. from a knee joint has been mainly performed by an incisional method (open surgery). however,
This surgery requires a relatively large incision, which causes trauma, tongue pain and limited movement, and requires a long time for complete recovery.

Therefore, recently, surgical techniques have been developed in which a small puncture hole is formed in the joint and a long and thin cutting blade is inserted into the puncture hole without incising the joint under observation using an arthroscope (endoscope). A surgical device has been proposed. This surgical operating device includes, for example,
It is equipped with an elongated cutting blade for cutting and a hand piece (gripping part) that drives a motor that rotates the cutting blade.

[Problems to be Solved by the Invention] By the way, the motor within the handpiece generates heat when loaded, so the handpiece may overheat while in use, making it impossible for the operator to hold the handpiece. There is. Therefore, it is conceivable to stop driving the motor when the handpiece reaches a predetermined temperature, but if the motor suddenly stops during surgery, it is not only inconvenient to use, but also poses a safety problem. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a surgical operating device that can prevent overheating of the gripping portion and can be used safely.

[Means for Solving the Problems] A surgical operation apparatus of the present invention includes a treatment section that performs resection of a target region, and a gripping section that is connected to the treatment section and has a motor that drives the treatment section. In the above-mentioned device, when a predetermined first temperature is detected by the temperature detection means for detecting the temperature of the gripping portion and the thirst detection means, a warning is given of overheating of the Moeki gripping portion? (2) A notification means, and a means for stopping power supply to the Tanabata when a predetermined second temperature higher than the first temperature by +1ri is detected by the temperature detection means.

[Operation 1] In the present invention, the treatment section is driven by a motor within the gripping section. Further, when a predetermined first humidity is detected by the temperature detection means, the 7I notification means warns of overheating of the gripping portion, and further, a predetermined second temperature higher than the first temperature is detected. Then, the power supply to the motor is stopped.

Examples] Hereinafter, the present invention will be described in detail with reference to the drawings.

Figures 1 to 11 relate to one embodiment of the present invention;
The figure is a block diagram showing the configuration of the surgical operating device, FIG. 2 is an explanatory diagram showing the entire system of the surgical operating device, FIG. 3 is a circuit diagram showing the configuration of the current detection circuit and switch circuit, and FIG. 4 is an explanatory diagram that simply shows the on/off control of the motor using a foot switch, Figure 5 is a characteristic diagram showing the torque-rotation speed characteristics when driving one hand piece, and Figure 6 is a characteristic diagram showing the torque-revolutions characteristic when driving one hand piece. A characteristic diagram showing the torque-rotational speed characteristics when driving a handpiece. Figure 7 shows one handpiece at 5 rotational speed.
A characteristic diagram showing the torque-rotational speed characteristics when driven at 00 rpm, Figure 8 is a sectional view showing the internal structure of the control unit, Figure 9 is a front view of the control unit, and Figure 10 is the A sectional view taken along the line A-Am in the figure, and FIG. 11 is a block diagram showing the main parts of a modification of this embodiment.

As shown in FIG. 2, the surgical operating device system includes an elongated cutting blade 1, a hand piece 2 that serves as a gripping portion connected to the cutting blade 1, and a control unit to which the hand piece 2 is connected. 3, a foot switch 4 connected to the control unit 3, and a sheath 5 for introducing the cutting blade 1 into the joint cavity. It also includes a 1-Rakar internal needle 6 for forming a puncture hole in the joint, and a mandolin (occluder) 7 for closing the puncture hole,
Said cutting blade 1. Trocar inner needle 6. A mandoline 7 is selectively inserted into said sheath 5. Further, a cleaning brush 8 for cleaning the cutting blade 1 is provided.

In the system in this embodiment, the cutting edge 1 is φ5
Straight cutting blade 1A, φ5 curved cutting blade 1B, φ3
Three types of straight cutting blades 1C are available. This cutting blade 1 has an inner tube rotatably inserted into an outer tube 11, and a blade portion 13 is formed at the tip of both the outer tube 11 and the inner tube, or only the inner tube. A large-diameter outer tube connecting portion 14 is provided at the rear end of the outer tube 11, and a rear end of the inner tube protrudes rearward from the outer tube connecting portion 14, and an inner tube is connected to the rear end of the outer tube 11. A connecting portion 15 is formed.

Further, the hollow portion of the inner tube serves as a suction passage, and a suction port 16 communicating with this suction passage is formed on the side of the inner tube connecting portion 15.

The blade portion 13 of the φ5 straight cutting blade 1A is as follows:
Side blade type 13a for sliding, side blade type 13b for synovium, hole type 13C1 for villi, tip blade type 13d for meniscus.

Five types of cartilage grinding type 13e are available.

In addition, the blade portion 13 of the curved cutting blade 1B of φ5 is as follows:
Side blade type 13f for sliding, side blade type 13g for synovial membrane.

Three types of meniscus type 13h are available.

Further, as the blade portion 13 of the straight type cutting blade 1C of φ3, the sliding side blade type 131. Three types of scales are available: side blade type 13j for synovium and last month type 13 for meniscus. Note that the hole blade type removes villi and the like by sucking them into the hole of the cutting blade.

Moreover, as the handpiece 2, two types of handpieces 2Δ and 2B to which any of the three types of cutting blades 1 can be connected are prepared. This handpiece 2 has a motor 22 (second
(not shown in the figure) is provided. Further, a connecting portion 23 to which the outer tube connecting portion 14 and the inner tube connecting portion 15 can be connected is provided at the tip of the main body 21, and the output shaft of the motor 22 is connected to the inner tube connecting portion 15. It is now connected. Further, at the rear end of the main body 21, a suction hose connection portion 24 communicating with the suction port 16 of the cutting blade 1 is provided.
is provided. Further, at the rear end of the main body 21,
A cord 25 for transmitting and receiving electric power from the motor 22 and signals to be described later is connected, and a connector 26 that is detachably connected to the control unit 3 is provided at the end of the cord 25.

The sheath 5 includes a large diameter sheath 5A for the straight cutting blade 1A of φ5, and a large diameter sheath 5A for the straight cutting blade 1A of φ5.
A flexible sheath 5B for B and a small diameter sheath 5C for the φ3 straight cutting blade 1C are prepared.

Further, as the trocar inner needle 6 and the mandoline 7, a large diameter one for the sheaths 5A and 5B and a small diameter one for the sheath 5C are prepared, respectively.

Further, the cleaning brush 8 is also available in large diameter brushes and small diameter brushes.

Next, the configuration of the control unit 3 will be explained with reference to FIGS. 8 to 10.

As shown in FIG. 9, on the front of the chassis 30, there is a
A front panel 31 is formed, and this front panel 31 includes a power switch 32 and an LE indicating the rotation speed in two rotation directions.
D33, rotation speed setting switch 34, warning LED 35,
A handpiece connector 36 and a footswitch connector 37 are provided. Hand piece 2. The foot switches 4 are adapted to be connected to the respective connectors 36, 37, respectively.

Further, as shown in FIGS. 8 and 10, substrates 41 and 42 and a transformer 44 are fixed to the bottom of the chassis 30. Further, the LEDs 33.35 are connected to the board 4.
It is attached to 3.

The boards 41 and 42 are each fixed to the chassis 30 via a collar 45. Further, the substrate 41 is laminated in two layers with a collar 45 interposed therebetween. Further, the hand piece connector 36 is connected to the
It is fixed to the chassis 30.

Heat sink stands 48 and 48 are fixed to both sides of the board 41 at the bottom of the chassis 30. At the top of this heat sink stand 48.48, there is an insulating collar 49.
A heat sink 50 is fixed via the. As described above, in this embodiment, the heat sink 50 has a structure in which the insulation is strengthened in order to improve safety considering that it is a medical device.

A duct 51 is provided on the side of the chassis 30 facing the heat sink 50.
A duct 52 is provided on the side of the chassis 30 opposite to the side where the transformer 44 is provided.
is provided.

Furthermore, two breakers 54 and 54 are provided on the back surface of the chassis 30, one above the other, and an inlet 55 for power supply is provided at the Th of the breakers 54, 54. Also, on these sides,
A noise filter 56 is attached. An insulating plate 57 is provided between the breaker 54, 54 and the substrate 42.

Further, an insulating plate 58 is provided near the power switch 32 between it and the board 41, and a terminal block 59 is attached to this insulating plate 58.

Next, referring to FIG. 1, the circuit configuration of the hand piece 2 and the control unit 3 will be explained.

The handpiece 2 includes a temperature control device 22 for rotationally driving the inner tube of the cutting blade 1, a Hall element 27 for detecting the rotation speed of the motor 22 in cooperation with a magnet (not shown), and a temperature sensor 22 for detecting the rotation speed of the motor 22. A temperature measuring element 28 made of a platinum temperature sensor or the like for detecting temperature, and a resistor 29 provided on the connector lid 26 for identifying the type of handpiece are provided. These are connected to the control unit 3 via the connector 26.

On the other hand, the control unit 3 includes a control circuit 61, and a setting switch 34.1 is connected to the control circuit 61.
D35 is connected, and the foot switch 4 is also connected. The foot switch 4 is of a double type; for example, when the right pedal is depressed, the motor 22 is activated.
rotates forward (clockwise), and when you press the left pedal, motor 22
is reversed (rotates to the left), and when both pedals are depressed, it rotates forward and backward. Each of these modes can be confirmed by an LED 33 (portions marked FWD and REV in FIG. 9) for indicating the rotational direction on the front panel 31. Further, the setting switch 34 is
The number of rotations of the motor 22 can be set, and the number of rotations set with this setting switch 34 is displayed on the LED 33 (5 in FIG. 9) for displaying the number of rotations on the front panel 31.
(the part marked PEED) is displayed as an approximate value. Note that the number (index) next to the LED 33 is multiplied by 1000 to indicate the approximate number of revolutions (rpm).

The control circuit 61 is configured to output a digital signal of the rotation speed set by the setting switch 34 in response to a signal indicating that the foot switch 4 is depressed. This signal is applied to the patient circuit side and the secondary circuit side (control circuit 61 side).
The voltage value of this analog signal corresponds to the rotation speed of the motor 22. This analog signal is applied to the base of a transistor 65 via a switch circuit 64.

A power supply voltage is applied to the collector of this transistor 65, and the emitter is connected to each fixed contact N09N of the two-pole relay 66.
Connected to O. Each fixed contact NC of this relay 66
, NC are connected to a current detection circuit 7O. Further, one movable contact COM of the relay 66 is directly connected, and the other movable contact COM is connected to contacts 68 and 68 of the handpiece connector 36 via a relay 67, respectively. This contact point 68.68 has ■-
22 is connected. The relay 67
is adapted to be driven by a relay drive circuit 71, and this relay drive circuit 71 is connected to a control circuit 61 via an isolation circuit 62, and is controlled by this control circuit 61. There is. Also,
The output of the current detection circuit 70 is connected to a switch circuit 64;
The signal is input to the control circuit 61 via the isolation circuit 62.

Further, the relay 67 is opened and closed by a signal from the foot switch 4 through the isolation fan circuit 62.

Further, the signal of the Hall element 27 in the hand piece 2 is transmitted to the connector 26. The signal is input to the control circuit 61 via the handpiece connector 36° isolation circuit 62.

Further, the hand piece connector 36 is provided with terminals 72, 72 connected to the identification resistor 29 of the hand piece 2, one terminal 72 is applied with a power supply voltage, and the other terminal 72 is grounded. There is. and the one terminal 7
2 is connected to the control circuit 6 via the isolation circuit 62.
Connected to 1. Then, the control circuit 61 controls the resistance 2
The type of handpiece 2 is determined based on the voltage between the two terminals.

Further, the handpiece connector 36 is provided with terminals 73 and 73 that are connected to the temperature measuring element 28 inside the handpiece 2. A constant current source 74 that supplies a constant current to the temperature measuring element 28 is connected to the terminals 73, 73. Further, two parallel resistors R1 and R2 are connected in series with this constant current source 74. Note that the resistance values of the resistors R1 and R2 are equal.

Further, a constant current monitoring circuit 75 is connected to both ends of the resistors R1 and R2 to monitor whether the current flowing through the temperature measuring element 28 is a correct constant current.

The output of the constant current monitoring circuit 75 is input to the control circuit 61 via the isolation circuit 62. Furthermore, two A/D converters 76 and 76 are connected to one terminal 73, and these A/D converters 76 and 76 convert the voltage generated across the temperature measuring element 28 into a digital signal. It is supposed to be done. The output signals of the A/D converters 76 and 76 are input to the control circuit 61 via the isolation circuit 62. Further, the output signals t of the A/D converters 76 and 76 are input to digital comparators 77 and 77, respectively, and compared with a predetermined threshold level.

The output of this digital comparator 77°77 is input to the switch circuit 64.

The switch circuit 64 and the current detection circuit 70 are constructed as shown in FIG. That is, the switch circuit 64 has a PNP transistor 81 on its right side, and the emitter of the transistor 81 and the base of the NPN transistor 82 are connected to the D/A converter 63. The base of the transistor 81 is connected to the current detection circuit 70 and the digital comparator 77, and the collector is grounded. The collector of transistor 82 is transistor 6
5, and its emitter is grounded.

On the other hand, in the current detection circuit 70, in order to detect the current flowing through the motor 22, two circuits are connected in series and in parallel to the motor 22.
Two resistors R3 and R4 are connected. This resistance R3,
The voltage across R4 is applied to each inverting input of two amparators 84.84. Each of the comparators 8
A reference voltage is applied to the non-inverting input terminals 4 and 84. The output end of each comparator 84, 84 is connected to the switch circuit 64 and the control circuit 61. If a current flows into the motor 22 in excess of the current value set by the current detection circuit 70, the switch circuit 64 is opened by the output of the comparator 84, 84, and the power supply to the motor 22 is stopped. It looks like this. Note that instead of the comparator 84, the resistor R
3. The voltage across R4 may be A/D converted and compared digitally with a reference value.

Next, the operation of this embodiment will be explained.

One of the handpieces 2A and 2B is selected and connected to the control unit 3 depending on the purpose.

In addition, the handpiece 2 has cutting blades 1A and 1A, I
B. Select one type of IC and connect it. When the motor 22 in the hand piece 2 is driven, the inner tube of the cutting blade 1 is driven to rotate, and the blade portion 13 at the tip performs cutting treatment. The excised tissue piece passes through the suction passage within the inner tube and is removed by suction by a suction device connected to the suction hose connection portion 24 via a bowse.

The control circuit 61 of the control unit 3 identifies the type of the connected handpiece 2 using the identification resistor 29 provided in the connector 26 of the handpiece 2, and identifies the two types of handpieces 2A and 2B with different characteristics. It is now possible to drive with.

The characteristics when the hand piece 2A is connected are as shown in FIG. That is, the upper limit of voltage is 35V,
The torque-rotational speed characteristic at V is as shown by the broken line. In addition, the upper limit of the rotation speed is set to 600 Orpm, and the upper limit of the load is set to 1.7 to 9 cm (no more can be applied due to the resistance of cutting edge 1), and the rotation speed is controlled to be constant within the range of the solid line. do. Therefore, the maximum driving capacity is motor 2
Power supply capacity to 2 is 35V, 3.7A.

On the other hand, the characteristic when handpiece 2B is connected is the sixth
The result will be as shown in the figure. That is, the upper limit of the voltage is 24V, and the torque-revolutions characteristic at 24V is shown by a broken line. Further, the upper limit of the rotation speed is set to 350 rpm, the upper limit of the load is set to 0.7 to 3·cttr (depending on the power supply capacity), and the rotation speed is controlled to be constant within the range of the solid line.

The rotation speed of the motor 22 is detected by the Hall element 27, and the detected rotation speed is fed back.

For example, when using handpiece 2A, index 5 (
When the motor 22 is set at index 5 (equivalent to 5000 rpm), as shown in FIG.
m) Apply a corresponding voltage. If there is no load, it is sufficient to continue applying this voltage, but when a load is applied, the number of rotations becomes smaller than 5000rl)m. In such a sharpening, the voltage is gradually increased until the rotational speed reaches 50 oorpm. However, the upper limit of the voltage is 35V. Therefore, when a certain load (T+ in the diagram) is exceeded, the rotation speed gradually decreases. In addition, the upstream detection circuit 70 detects the current flowing through the motor 22, and applies a limiter so that the current does not exceed the upper limit of the load (<1.7 kg/cttr) as shown in the figure.

Further, the rotation direction of the motor 22 and the on/off control of the rotation are performed by the foot switch 4. The signal from this foot switch 4 is transmitted to the control circuit 61. Isolation circuit 62
．． The signal is sent to the relay 66 via the relay drive circuit 71. Further, the signal from the foot switch 4 is sent to a relay 67 via an isolation circuit 62.

The control circuit 61 outputs a digital signal of the set rotation speed in response to a signal indicating that the foot switch 4 has been pressed. This digital signal is isolated by an isolation circuit 62 and converted into an analog signal by a D/A converter 63. This analog signal is supplied to the motor 22 via a switch circuit 64.

Further, the current flowing through the motor 22 is detected by the current detection circuit 70, and if the current flows more than the current value set by the current detection circuit 70T, the switch circuit 64 is opened and the power supply to the motor 22 is stopped. .

Further, the signal of the foot switch 4 taken into the control circuit 61 is sent to the relay drive circuit 71 via the isolation circuit 62, and this relay drive circuit 71 controls the settings of the foot switch 4 (forward rotation, reverse rotation). The relay 66 is switched accordingly.

On the other hand, the signal from the foot switch 4 directly switches the relay 67 via the isolation circuit 62. J, direct motor? Turn 2 on and off.

As a result, the signal from the foot switch 4 is a signal that has passed through the control circuit 61 (signal compatible with software) and a signal from the motor 2.
There is a signal (hardware compatible signal) that is sent directly to the relay 67 that switches between on and off of the motor 22, and the motor 22 will not turn on unless both of these signals are present. This control system is briefly shown in FIG. 4. In other words, the software corresponding signal from foot switch 4 and the hardware corresponding signal are AN.
The relationship is that the signal is input to the D gate 80, and the output of the AND gate 80 turns on the motor 22. Therefore, even if a problem occurs on the software side, the motor 2
2 can be stopped. In other words, even if it is erroneously determined that the foot switch 4 is being depressed on the software side, there is a means to stop the motor 22 on the hardware side.

Further, if the current detection circuit 70 fails, there is a possibility that the motor 22 cannot be stopped even if too much current flows through the motor 22. Therefore, in this embodiment, the current detection circuit 70 has two systems of resistors R3 and R4 and comparators 84 and 84, as shown in FIG. 3, so that it can operate normally even if one system fails. ing. In this way, in this embodiment, measures against single failure (SFC) are taken for the output control system.

Further, in this embodiment, measures against a single failure are also taken for the rotational speed detection system. If any part of the signal line from the Hall cable 27 fails, the power applied to the motor 22 will reach its maximum driving capacity. This is because if the signal from the Hall element 27 does not come, it is determined that the set rotation speed is not reached, and the voltage supplied to the motor 22 is increased to the maximum. It is conceivable to stop the power supply to the motor 22 when the signal from the Hall element 27 stops coming. However, the same phenomenon as the above failure (signal not coming from Hall element 27)
According to the specifications, this also occurs during actual use.

This is a case where the load is too large, and in this case, the maximum voltage and current must continue to be applied, so it is not possible to stop the power supply to the motor 22 when the signal from the Hall element 27 stops coming. If such measures are taken, once the motor 22 stops, it will never rotate again.

Therefore, in this embodiment, we focus on the fact that when no signal is received from the Hall element 27 in actual use, the current flowing through the motor 22 reaches its maximum value (the current value to which the limiter is applied), and we use the following method to prevent failures. To detect.

1. If [no signal comes] and [current is maximum],
normal.

2. If there is no signal and the current is less than the maximum value, it is abnormal.

If there is an abnormality, the power supply to the motor 22 is stopped. The control circuit 61 detects such a failure and stops power supply. However, as long as the motor 22 does not rotate, the Hall element 27 is normal.

Abnormalities cannot be determined.

If two ball elements are placed in the hand piece 2 and controlled in two systems, a single failure can be handled without any problem, and the failure rate will be reduced to that of a single Hall element. Having two elements increases the number of connector bins and cables, and the handpiece 2 has a large size.
It becomes heavy and undesirable.

Moreover, overheating of the handpiece 2 is prevented in the following manner.

When a current (I) is supplied to the temperature measuring element 28 by the constant current source 74, a voltage of R-1 is generated across the temperature measuring element 28 due to the resistance (R) of the temperature measuring element 28. Navigation lagoon element 2
Since the resistance value of temperature probe 8 changes with temperature changes (in this embodiment, the higher the temperature, the greater the resistance).
The voltage generated across the terminal has temperature information. This generated voltage is converted into a digital signal by the A/D converter 76, 76'C and is input to the control circuit 61 as temperature information. When this control circuit 61 detects a predetermined first temperature from the temperature information, it blinks or lights up the warning LED 35 on the front panel 31, and detects a predetermined second temperature higher than the first temperature. Sometimes D/
The power supply to the motor 22 is stopped through the A converter 63.

Further, the threshold level of the digital comparator 77.77 is a digital value corresponding to the second temperature, and the output of the A/D converter 76.76 exceeds the value corresponding to the second temperature. When the switch circuit 64 is opened by the output of the digital comparator 77.77,
The power supply to the motor 22 is stopped without going through the control circuit 61. In this way, the motor can be stopped in two systems, one via the control circuit 61 and the other via the digital comparator 77, making it safer.

Further, the constant current source 74 is monitored by a constant current monitoring circuit 75, and if the constant current is not correct, the motor 22 is stopped via the control circuit 61.

In this embodiment, measures against a single failure are also taken for the temperature detection system of the handpiece 2.

Generally, it is sufficient to have two temperature detection systems (in parallel). That is, it is sufficient to have two temperature measuring elements and two constant current source 1 generated voltage detection means. However, it is not preferable to include two temperature measuring elements in the hand piece 2, as in the case of the Hall element described above, the number of connector bins and cables increases, and the hand piece 2 becomes larger and heavier. Therefore, in this embodiment, measures against a single failure are implemented within the control unit 3. The handpiece 2 is something that the Ministry of Arts holds in its hand, so it is desirable that it be small and lightweight;
Since the control unit 3 is generally placed in a cart, it is not a big problem if we handle it here. In this embodiment, there is one temperature measuring element 28, and means for determining whether or not this temperature measuring element 28 is normal is provided on the control unit 3 side.

Countermeasures against a single failure in the temperature detection system of the handpiece 2 are shown below.

1. When the constant current source 74 fails, there is no problem if the constant current source 74 fails in the direction where the current increases, as the temperature is determined to be high and a warning and shutdown are performed, but if it fails in the direction where the current decreases, it becomes a problem. . In this case, the constant current monitoring circuit 75 determines that a failure has occurred.

2. When one of the resistors R1 and R2 fails, if there is a relationship of R1=R2, if either resistor fails,
The signal input to the constant current monitoring circuit 75 is voltage=resistance×
Since it is twice as high due to the current relationship, we know that there is a failure.

3. When one of △/D76.76 fails, two A/
Since I have D76.76 in parallel, either A/
D76 works properly.

4. When the temperature measuring element 28 fails, the temperature measuring element 28 only fails in the direction where the resistance increases, so in this case, it is determined that the temperature is high and a warning and shutdown are performed, so there is no abnormality in other components. If not, there is no problem.

5. When the constant current monitoring circuit 75 fails, the other components are normal, so the overall operation is normal.

Further, as described above, there are two systems of means for stopping the motor 22 in the event of a failure: software and hardware.

Note that the Whiston bridge method may be used as the temperature detection means.

FIG. 11 is a block diagram showing the main parts of a modification of this embodiment.

In this variant, the two A/D converters 76.7 of FIG.
6, a comparator 91 for detecting a first temperature for warning and a comparator 92 for detecting a second temperature for stopping the motor are provided.

The outputs of the comparators 91 and 92 are input to the control circuit 61 via the isolation circuit 62. Further, the output of the comparator 92 opens the switch circuit 64.

According to this embodiment, the temperature of the handpiece 2 is detected, overheating is notified at a predetermined temperature, and if the temperature rises further, the power supply to the motor 22 is stopped. In addition, overheating of the handpiece 2 can be prevented, and the motor 22 can be used safely without suddenly stopping during surgery.

Furthermore, in this embodiment, the handpiece 2 is made larger.

The output control system, rotation speed detection system, and humidity detection system are designed to prevent single failures without increasing the weight, so safety is high.

It should be noted that the present invention is not limited to the above embodiments, and for example, the first embodiment
In addition to the two A/D converters 76 and 76 shown in the figure, a comparator for the second temperature detection may be provided, and the switch circuit 64 may be opened by the output of this comparator.

[Effects of the Invention] As explained above, according to the present invention, when the gripping portion reaches a predetermined first temperature, the warning means warns of overheating of the gripping portion, and furthermore, when the gripping portion reaches a predetermined first temperature, When the second humidity level is reached, power supply to the motor in the grip is stopped, which has the effect of preventing the grip from overheating and allowing the surgical device to be used safely.

[Brief explanation of drawings]

Figures 1 to 11 relate to one embodiment of the present invention;
The figure is a block diagram showing the configuration of the surgical operating device, FIG. 2 is an explanatory diagram showing the entire system of the surgical operating device, FIG. 3 is a circuit diagram showing the configuration of the current detection circuit and switch circuit, and FIG. 4 Fig. 5 is an explanatory diagram that simply shows the motor ON and A control using a foot switch, Fig. 5 is a characteristic diagram showing the torque-rotation speed characteristics when driving one hand piece, and Fig. 6 is a diagram showing the torque-rotation speed characteristic when driving one hand piece. A characteristic diagram showing the torque-rotational speed characteristics when driving a piece, Figure 7 shows one handpiece at a rotational speed of 50.
A characteristic diagram showing the torque-rotational speed characteristics when driving with the setting set to 0 rpm. Figure 8 is a sectional view showing the internal structure of the control unit. Figure 9 is a front view of the control unit. Figure 10 is the 11 is a block diagram showing the main parts of a modification of the present embodiment. 1. Cutting blade 2. Handpiece 3.
...Control unit 4...Foot switch 22...Motor 28...
・Temperature measurement element 35...Warning LED61...Control circuit Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 (kg・go)

Claims (1)

[Claims] Temperature detection means for detecting the temperature of the gripping section in a surgical operating apparatus comprising a treatment section that performs resection of a target region, and a gripping section that is connected to the treatment section and has a motor that drives the treatment section. a warning means for warning of overheating of the grip portion when a predetermined first temperature is detected by the humidity detecting means; and a predetermined second temperature higher than the first temperature by the temperature detecting means. and means for stopping power supply to the motor when a temperature of the motor is detected.