CN1023377C

CN1023377C - Automatically following system for laser radiating cure

Info

Publication number: CN1023377C
Application number: CN 87107300
Authority: CN
Inventors: 董振基
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-12-11
Filing date: 1987-12-11
Publication date: 1994-01-05
Anticipated expiration: 2002-12-11
Also published as: CN1033444A

Abstract

The present invention relates to an automatically following system for laser radiating treatment, which belongs to laser medicine instrument. The present invention designs a closed-circuit radar type automatically following system for medical feedback through a position sensitive detector and solves the puzzle that accurate positioning and automatically follow are difficult in the process of uninterrupted laser radiation treatment, and thus, patients can freely and relaxedly accept the radiation treatment. The present invention removes the difficulties of mannual suport and frequent regulation for collimating a disease position so as to enhance radiation correct rate and curative effects. The system is provided with a running state displayer and has the functions of automatic stop, etc. and thus, the patients can carry out self-correction, and only a doctor can operate a plurality of machines. The present invention can be used for any laser radiation treatment systems for medicine.

Description

Automatically following system for laser radiating cure

The invention belongs to the technical field of laser medical equipment.This system is applicable on the therapeutic equipments of any medical laser beam irradiation.

In the prior art, because of beam direction is fabulous, energy is very concentrated, carries out the irradiation that " pointwise " is constant or scan so require the treatment light beam must accurately aim at focus or special body position.Depart from slightly then may cause invalid.Therefore, curative effect is directly relevant with correct exposure dose.Usually it is to realize by the control irradiation time.In order to guarantee that the prolonged exposure time can correctly reflect exposure dose, require between exposure age in, the exposure position should keep the static relatively of millimeter order of magnitude precision with respect to laser spot.Some occasions is used optical fiber light-guiding, though be convenient to aim at neatly focus, holds but still must the doctor continue to hold up.And because the medical optical fiber energy loss of multimode is bigger, the angle of divergence of output is bigger than normal, has limited its scope of application.Still must use the mode of former laser beam direct irradiation under many situations.For bigger laser instrument, at present the method that adopts is that reflecting mirror by means of a hand adjustment makes laser beam aim at focus and manages to make the sick body oneself to maintain static.In fact be difficult to the basic demand that reaches above-mentioned.And the doctor regulates continually or patient is for a long time stiff fixed motionless, not only tired, also very inconvenient, thereby present prior art its with the clinical practice requirement between also exist disconnection, influenced the actual effect of laser radiation.

The objective of the invention is in order to overcome the problems of the prior art, design a kind of medical feedback automatic following system of closed circuit radar type, an accurate location in the treatment of laser prolonged exposure and a difficult problem of following have automatically been solved, so that improve the laser therapy means and raising sights rate and curative effect.Because sick position is complicated various, and the randomness that does not independently move of human body, existing laser orientation control position technology all can not be transplanted.The present invention is different from the laser alignment telescope in the engineering, also is different from laser radar.We claim that it is " a closed circuit laser radar ".

Content of the present invention and design are as follows:

The automatic following system of laser radiation is to have adopted to be suitable for being attached to the suitable adjacent position of focus to be treated quick photoelectric sensor-monitoring light target, the servosystem of principal reflection mirror, treatment laser beam, two dimension take a sample beam splitter and each parts such as monitoring light beam and supervisory circuit, cooperatively interacts and constitutes the medical feedback automatic following system of closed circuit radar type.Owing to be to take from the treatment light beam and to feed back to the servosystem of primary feedback mirror, thereby make treatment light beam be adjusted the aligning focus at any time via primary mirror reflects with the position error signal of the monitoring light beam of treatment parallel beam interlock.Because feedback signal is not from illuminated treatment body surface, the concrete character of lesion itself there is not any qualification requirement.The time resolution characteristics of native system can guarantee to treat light beam and in time catch up with freely to loosen posture and accept the involuntary little of sick body of irradiation treatment and move.

The advantage of this invention and effect are that native system has improved the rate of sighting, and can shorten treatment time significantly, reduce medical expense.The popularization of more favourable laser radiation technology.In addition, native system is not only light patient has also liberated the doctor, can realize that a doctor looks after multiple devices simultaneously, reduces the working doctor amount, increases the number of going to a doctor simultaneously, increases work efficiency.

The quick photelectric receiver material of native system change bit or attach to the simulation H _e-N _eAfter the laser beam, can be applied to any medical iraser irradiation treatment system.

Description of drawings:

The structure of Fig. 1 system and operation principle sketch map

The control circuit schematic diagram of Fig. 2 system

Embodiment: below in conjunction with the description of drawings one embodiment of the present invention.

Fig. 1 is the structure and the operation principle sketch map of native system.Be fixed in the 1-1(of large laser system precision and the equipment that high voltage danger is arranged on the table) isolate with patient.By means of the 1-2 of principal reflection mirror system laser beam 1-3 is folded to sick body position 1-4 to be illuminated.The principal reflection mirror system is contained on the camera crane.It comprises the convergence reflex mirror of the high reflecting medium film of being coated with of a larger radius of curvature and the direction of a cover manual and electric dual-purpose is regulated servo control mechanism.Manual function is used for initial setting up and aims at position to be illuminated.Electric functions is used for following automatically thereafter.Two dimension sampling beam splitter 1-5 is a light, mechanical, electrical molectron.It divides taking-up sub-fraction energy (1-5%) to go forward side by side the row amplitude modulation as monitoring light beam 1-6 from treatment light beam 1-3.Monitor optical light beam 1-6 is parallel to treatment light beam 1-3, but relative distance and dimensional orientation can two dimension manual adjustments continuously.Utilize this function can around lesion 1-4, select the fixed position of only position as monitoring light target 1-7.In fact beam splitter 1-5 and the principal reflection mirror system of taking a sample be multi pack together.When treatment optical maser wavelength was visible light, monitoring light target 1-7 was made up of four-quadrant silicon cell, optical filter and shade.What monitor light target 1-7 and body skin fixedly is to utilize the double-faced pressure-sensitive gummed paper that is equipped with at random.Light target does not contact the lesion and isolates with the body skin, can prevent cross infection.1-8 is a supervisory circuit among the figure.

Fig. 2 is the control circuit schematic diagram of native system.Each of four-quadrant silicon cell 2-1 is to the quadrant (X of level for example ₁, X ₂) output signal of telecommunication I _X1And I _X2After amplifying via preposition frequency-selective amplifier 2-2 respectively, enter corresponding analog subtracter 2-3 and adder 2-4 simultaneously separately.Then with difference signal (I _X2-I _X1) and and signal (I _X2+ I _X1) analog divider 2-5 feeds.Its operation result amplifies the servo motor that the rear drive principal reflection mirror 1-2 of system goes up the control respective direction through power amplifier 2-6, carries out and moves with motion tracking.Another dimension (Y direction) is with same principle work.In order to eliminate the environment interference of stray light, monitoring light beam 1-6 is modulated by a chopper.Modulating frequency f _mConsistent with the passband of preposition frequency-selective amplifier.The input of preamplifier state has the adaptive adjusting of light intensity; Difference is put level has range to regulate.The two cooperates with the variable optical attenuator of sampling on the beam splitter, can make the existing enough sensitivity of supervisory circuit be operated in the best scope of linearity again.Through the processing of analog operational circuit, servo voltage only is directly proportional with position skew (how much) amount.And it is irrelevant with laser intensity and stability.So native system all has the track positioning accuracy of same levels to any power with any unsettled laser instrument.

The operation sequence of native system is:

(1) reflector mount of the 1-2 of manual adjustments principal reflection mirror system makes it return to mechanical balance position (manually making zero).

(2) make sick body be in the posture of relative the most comfortable, by the adjusting knob on the spider (coarse adjustment) and in (1) used manual adjustments button (fine tuning), make treatment light beam 1-3 align therapentic part 1-4 substantially.

(3) around therapentic part 1-4, select a fixing suitable point (marking) of monitoring light target 1-7.Regulate sampling beam splitter 1-5, monitoring light beam 1-6 is penetrated in this point.

(4) take monitoring light target 1-7 to aim at monitoring light beam 1-6, make X, Y orientation in order.Open servo circuit, slight mobile light target 1-7 will treat light beam 1-3 and guide to desired position, paste and decide light target.System begins execution and follows automatically.

The display device that contains various duties in the control circuit of native system is installed on the guidance panel, and doctor and patient can see simultaneously whether system is working properly in running; Whether owing to sick body too much causes servo-actuated scope above native system to the single direction skew.So that doctor or patient oneself in time corrects seat, prone position gesture.In addition, also have timing system, can deposit the selected irradiation treatment time in timing system by button, then send the news sound that to distinguish plane No. and block the treatment light beam automatically.

Claims

1, a kind of automatic following system of laser radiation is characterized in that adopting monitoring light target, the servosystem of principal reflection mirror, treatment laser beam, two-dimentional take a sample beam splitter and monitoring light beam and each parts of supervisory circuit to cooperatively interact and constitute the negative feedback arrangement of closed circuit radar type.

2, according to the described automatic following system of claim 1, it is characterized in that:

A. monitor light target and adopted the quick photoelectric sensor in position, select the fixed position of only position as the monitoring light target, and utilize double-faced pressure-sensitive gummed paper and body skin to fix, when treatment optical maser wavelength was visible light, the monitoring light target was made up of four-quadrant silicon cell, optical filter and shade;

B. the servosystem of principal reflection mirror, be to take from the treatment light beam and feed back to the servosystem of principal reflection mirror with the position error signal of the monitoring light beam of treatment parallel beam interlock, the principal reflection mirror system is contained on the spider, and it is to regulate servo control mechanism by the direction of the convergence reflex mirror of the high reflecting medium film of being coated with of a larger radius of curvature and a cover manual and electric dual-purpose;

C. two dimension sampling beam splitter is a continuously adjustable light, mechanical, electrical molectron, with principal reflection mirror system multi pack together, its divides from the treatment light beam and takes out partly energy, carries out Modulation and Amplitude Modulation as monitoring light beam.

3,, it is characterized in that being furnished with subtraction, the device of addition and division analog operational circuit according to the described automatic following system of claim 1.