JPH0626601B2 - Collision detection device for medical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is provided in a medical examination apparatus having a movable part to prevent the movable part from coming into contact with a patient or the like and damaging the patient or the like. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision detection device, and more particularly to a collision detection device that can effectively detect this collision even when an accessory is attached to a movable part.

[Conventional technology]

FIG. 3 is a schematic configuration diagram showing a medical examination apparatus, for example, a linear accelerator for treatment. The fixed base (1) has a movable part such as a rotary base.
(2) is attached, and the rotary mount (2) rotates about its virtual rotation axis (2a). Collimator head
(3) is attached to the rotary mount (2) and its virtual rotation axis (3
Rotate around a) to limit the spread of radiation (3b) generated in the therapeutic linear accelerator. The virtual rotation axis (3a) of the collimator head (3) is also the central axis of the ray bundle of the radiation (3b). The intersection (4) between the virtual rotation axes (2a) and (3a) is the center point of treatment called isocenter. The patient (5) to be treated is laid on the top plate (6), and the top plate (6) is the treatment table (7).
Positioned by At the accessory mounting position (8) below the collimator head (3), an accessory such as an applicator (9) as shown is mounted. A contact detector (10) is attached to the collimator head (3), and a contact detector (11) is also attached to the applicator (9).

FIG. 4 is a schematic configuration diagram and a schematic circuit diagram showing an example of a conventional collision detection device. In FIG. 4A, an applicator (9) is attached to the collimator head (3), the contact detector (10) is directly connected to an interlock circuit described later, and the contact detector (11) is an interlock circuit. To the connector (12). FIG. 4B and FIG. 4C show circuit examples of a conventional collision detection device, which are switches (13), (14).
Operates when each of the contact detectors (10) and (11) operates, and one may be used, or a plurality of may be used as necessary. Interlock circuit built into the device
(15) has a sequence for stopping the movement of the movable part or the accessory or stopping the generation of radiation (3b) by these switches (13) or (14). In the example of FIG. 4B, the switches (13) and (14) are of the normally closed contact type, and when there are a plurality of switches, they are connected in series. Fourth
In the example of FIG. C, the switches (13) and (1
4) is a normally open contact type connected in parallel.

Next, the operation will be described. The rotary mount (2) is a fixed mount
It can rotate about its virtual rotation axis (2a) with respect to (1). The radiation (3b) is applied to the affected part of the patient (5) placed in the isocenter (4), at which time the rotary mount (2) stops or rotates according to the treatment plan. The contact detector (so as to stop the irradiation of the radiation (3b) or the motion of the movable part when the rotating gantry (2) that rotates during irradiation or when setting the patient contacts the patient (5) or other parts of the device. 10) is attached to the collimator head (3). The collimator head (3) has an accessory mounting position (8) so that various accessories used for treatment can be mounted, and the accessory is mounted there.
Although an applicator (9) used for radiotherapy as an accessory is shown in FIG. 3, a shear tray, a punching device, a wedge filter, etc. may also be used.
The contact detector (11) is also attached to (9) for the same purpose as the contact detector (10).

As shown in FIG. 4A, the contact detector (11) of the applicator (9) is circuitically connected to the collimator head (3) by the connector (12) and thus to the interlock circuit (15). Connected. (However, the interlock circuit (15) does not have to be inside the collimator head (3).) In the example of FIG. 4B, the contact detector of the collimator head (3)
The switch (13) of (10) is connected in series, and the collision can be detected when any one of the switches is opened. Similarly, the switch (14) of the contact detector (11) of the applicator (9) is connected to the switch (14). Therefore, the collision can be detected, and thus the interlock circuit (15) stops the irradiation of the radiation (3b) or the movement of the rotary mount (2).

In the example of FIG. 4C, when either one of the switches (13) or (14) operates and the circuit is closed, the collision of the collimator head (3) or the applicator (9) can be detected, and the interface can be detected. The lock circuit (15) operates as described above.

[Problems to be solved by the invention]

In the conventional collision detection device, in the case of FIG. 4B, the state in which the applicator (9) is not attached is the same as the state in which the contact is detected. I have to give a signal separately.
Further, in the case of FIG. 4C, since the state in which the applicator (9) is not attached is the same as the state in which it is normally attached,
After all, the accessory mounting signal must be given separately. In either case, even if there was an accessory attachment signal, it was still unclear whether or not the accessory was attached correctly.

The present invention has been made to solve the above-mentioned problems, and the number of connector contacts is kept as it is, and the accessory is mechanically detected by detecting that the accessory is mounted. It is an object of the present invention to obtain a collision detection device that can always detect a collision simply by attaching and detaching it.

[Means for solving problems]

The collision detection device according to the present invention is attached to at least one of a movable part and an accessory, and detects that the movable part or the accessory comes into contact with a human body or a part other than the movable part of the medical examination apparatus or another device. And a sequence detecting means connected to the contact detecting means at the time of operation for stopping the movement of the movable part or the accessory or stopping the generation of radiation in the medical examination apparatus. A collision detection unit that is connected between a power source and the ground and that detects a collision due to contact detection of the movable portion or the accessory, and a mechanical detection unit that mechanically detects that the accessory is attached. It is connected between the power source and the ground and is operated by the mechanical detection means to send a signal indicating that the accessory is mounted to the sequence means and the accessory. There is provided with a means for displaying the state that the cassette 36 is loaded.

[Action]

According to the present invention, the contact detection machine can always be realized only by the attachment / detachment operation of the accessory, irrespective of the change in the contact detection state depending on whether or not the accessory is attached.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a circuit diagram showing a basic circuit of an embodiment of the present invention, in which a power source (21) is a relay (22) operated by the power source (21) and the normally-closed contact described above with reference to FIG. 4B. It is connected in series to the connection point (T1) via the mold switch (13), and the state is changed by a mechanical cam (31) attached to the applicator (9) between this connection point (T1) and the ground. The limit switch (32) is connected. The movable contact of this limit switch (32) is normally on the (NC) side,
Move to O) side. Note that (C) is the common of the limit switch (32). The relay (22) has a normally open contact (22a) connected to the interlock circuit (15), and a protection diode (23) is connected between both ends thereof.

FIG. 2 shows a signal indicating that the applicator (9) is attached to the basic circuit of FIG. 1 and the applicator (9).
It is a circuit diagram which shows the application circuit which combined the means which displays that was mounted | worn. Power supply (21) and limit switch (3
Between 2), another relay (33) operated by this limit switch (32) and its protection diode (34)
Are connected in parallel. Further, an indicator lamp (35) indicating that the applicator (9) has been attached is connected between the power source (21) and the ground. The other relay (33) is a normally closed contact.
(33a) and normally open contacts (33b) and (33c), the normally closed contact (33a) is connected between the switch (31) and ground, and the normally open contact (33b) is an interlock circuit (15). And the normally open contact (33c) is connected between the power supply (21) and the indicator lamp (35).

In the basic circuit shown in FIG. 1, when the applicator (9) is not attached, the limit switch (32) is set to the first position.
Take the state shown in the figure, that is, the movable contact is on the (NC) side. At this time, the relay (22) is a switch (13) for detecting collision of the collimator head (3) and a limit switch (32).
It is operated by the power supply (21) through the interlock circuit (1) by closing the normally open contact (22a).
A signal is sent to 5) indicating that "no collision has occurred". However, when contact of a moving part such as the collimator head (3) is detected by the contact detector (10), the switch (13) opens, which causes the relay (22) to enter its normal state. By opening the normally open contact (22a), a signal indicating "a collision has occurred" is sent to the interlock (15).

Next, when the applicator (9) is installed, the cam (31) moves the movable contact of the limit switch (32) to the (NO) side, and normally detects the collision between the switch (13) and the applicator (9). It is connected in series with the closed contact type switch (14). As a result, whichever switch (13) or (14) is opened, the relay (22) will be in its normal state, and the interlock circuit (15) will output a signal indicating that a "collision has occurred" as described above. Send to.

In the application circuit shown in FIG. 2, when the applicator (9) is attached and the limit switch (32) is closed, the other relay (33) is operated and the normally closed contact (33a) is opened. The switches (13) and (14) are connected in series, and by closing the normally open contact (33b), a signal indicating that "the applicator (9) has been mounted" is sent to the interlock circuit (15). The indicator lamp (3) indicates that “applicator (9) has been installed” by feeding and closing its normally open contact (33c).
It can be displayed in 5).

In addition, although the above-mentioned embodiment explained the linear accelerator for medical treatment, the present invention can be similarly applied to other radiotherapy apparatuses, radiographic apparatuses, medical apparatuses having movable parts such as X-ray CT.

The relay (22) may be a semiconductor element having the same function as this, and the contact detector (10) of the movable part may be omitted if there is no risk of contact. This is the same also in the case of a medical device having other movable parts.

〔The invention's effect〕

As described above, the present invention is attached to at least one of a movable part and an accessory, and detects that the movable part or the accessory comes into contact with a human body or a part other than the movable part of the medical examination apparatus or another device. And a sequence detecting means connected to the contact detecting means at the time of operation for stopping the movement of the movable part or the accessory or stopping the generation of radiation in the medical examination apparatus. A collision detection unit that is connected between a power source and the ground and that detects a collision due to contact detection of the movable portion or the accessory, and a mechanical detection unit that mechanically detects that the accessory is attached. The accessory is connected between the power source and the ground and is operated by the mechanical detection means, and sends a signal indicating that the accessory is mounted to the sequence means and the accessory. Since it is equipped with a means to display that it has been attached, when attaching the accessories necessary for medical treatment to the movable part of the medical equipment to perform medical treatment, make sure that contact detection of the accessory is done only by attaching and detaching the accessory. This has the effect of increasing safety for protecting patients and devices.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a basic circuit of one embodiment of the present invention,
FIG. 2 is a circuit diagram showing an application circuit according to an embodiment of the present invention, FIG. 3 is a schematic configuration diagram showing an example of a treatment apparatus, and 4A.
4 to 4C are a schematic configuration diagram and a schematic circuit diagram showing a conventional collision detection device. In the figure, (3) is a collimator head, (9) is an applicator, (10) and (11) are contact detectors, (12) is a connector, and (13) is
(14) is a switch, (15) is an interlock circuit, (21) is a power supply, (22) is a relay, (31) is a cam, (32) is a limit switch, (33) is another relay, and (35) is It is an indicator lamp. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] 1. A medical examination apparatus having a movable part, wherein the movable part may come into contact with a human body such as a patient, a part other than the movable part of the medical examination device, or another device, which is necessary for medical treatment. In the medical examination apparatus capable of performing medical treatment by attaching a detachable accessory to the movable part, the movable part and the accessory are attached to at least one of the movable part and the accessory, and the movable part or the accessory is the human body, or Contact detection means for detecting contact with the part or the other device, and the contact detection means is connected during operation,
A sequence means for stopping the movement of the movable part or the accessory or stopping the generation of radiation in the medical examination apparatus, and connected between the power supply and the ground, and connecting the movable part or the accessory. Collision detection means for detecting a collision due to contact detection, mechanical detection means for mechanically detecting that the accessory is attached, and the mechanical detection means connected between the power source and the ground. A collision detection device for a medical examination apparatus, comprising means for operating and sending a signal indicating that the accessory has been mounted to the sequence means and displaying that the accessory has been mounted. 2. The movable part includes a rotary mount mounted on a fixed mount and a collimator head mounted on the rotary mount for limiting the spread of radiation generated inside the medical examination apparatus, and an accessory mounted on the collimator head. The article is one device selected from the group consisting of an applicator, a shed tray, a punching device and a wedge filter, and the medical device is a linear therapeutic accelerator, a radiotherapy device,
A first apparatus selected from the group consisting of a radiographic apparatus and an X-ray CT.
The collision detection device of the medical examination apparatus according to the paragraph. 3. The collision detection device for a medical examination apparatus according to claim 1, wherein the sequence means includes an interlock circuit. 4. The collision of the medical device according to claim 1, wherein the mechanical detection means includes a cam attached to an accessory and a limited switch whose state is changed by the cam. Detection device.