CN1021954C - Source feeding mechanism of backing radioactive therapy instrument - Google Patents

Abstract

The present invention belongs to a component for medical devices. A new source feeding mechanism of the proposal is provided in order to solve the problem of complicated source feeding structures of the existing homogeneous rearmounted machines. The new source feeding mechanism realizes a method of double-source alternate transmission by using a set of driving device, and is composed of a set of driving mechanism, a converter which is arranged in a safe shielding storage container and is capable of controlling source varieties, and an intermediate storage, wherein the converter is drawn by a magnet to change position and is capable of alternately changing sent source varieties, and source varieties which are not sent out are sent to the intermediate storage to be stored in a shielding device. The prevent invention has the characteristics of simple structure and safe protection.

Description

Source feeding mechanism of backing radioactive therapy instrument

The invention belongs to parts in the A61 apoplexy due to endogenous wind medical apparatus and instruments, it is specifically related to source feeding mechanism novel in the afterloader and send the method for the source source of bank savings.

Afterloader is a kind of medical apparatus and instruments of the direct radiation therapy malignant tumor of employing radioactive source that grows up in this century, and it is to carry the passage of radioactive source to place the intravital canceration affected area of people earlier, again radioactive source is delivered to appointed part and treats.Useful compressed air is the radioactive source transmission medium in prior art, select the radioactive source of various dose from bin, to send into (as day island proper Tianjin company product) in the intravital treatment passage of people by selector valve, also useful motor (Bock as Germany reins in, the afterloading unit product of Dutch He Tong company) that to be power source carry radioactive source with steel wire rope.In addition, also the source of useful microdosage or other similar substance are in kind delivered to the appointed part of treatment earlier as dummy source, to observe and to measure the clear and coherent situation of radioactive source passage, send into radioactive source thereafter again.The safety for the treatment of operation for assurance carries radioactive source all will send dummy source earlier before with accurate each time, and this is easy the realization in the operation of large radiation dosage short time.

The afterloading unit of the Dutch He Tong CN87104821 of company in prior art is uploaded and sent radioactive source and dummy source is to adopt two cover driving mechanisms, comprise two motors, two driving wheels, two cover directive wheel and tightening belts, it has not only increased the number of components of connecting gear, and make its control circuit and control sequence complicated more, in addition, in the technical scheme of U.S. Pat 4631415 " radiotherapy unit ", adopted a cover driving mechanism, can drive many (as 48) radioactive sources, a plurality of at ordinary times radioactive sources store in first cask flask, driving wheel is sent a plurality of cables in source that send simultaneously during work, useful radioactive source is sent through conduit, unnecessary no source is then sent in the secondary shielding container through guiding hose, what this machine adopted is the low dosage radioactive source, but a plurality of radioactive sources that do not participate in treating will enter in the secondary shielding mechanism by way of the relatively poor guiding hose of shielding, and the leakage of this radiation all is disadvantageous to environment and patient.

The objective of the invention is to adopt a cover driving mechanism, send different source kinds selectively, measure the situation of the stem passage that presets as at first sending dummy source, and radioactive source is stored in the source storage device in the screening arrangement, normal back withdrawal dummy source is confirmed in calibrating, in next program, send radioactive source again, the accurate and safety of so not only having simplified machinery but also having guaranteed to operate.

By as above design, the novel source feeding mechanism of the afterloader that this programme provided has used the motor power source that drives usefulness, the driving mechanism of one cover transmission radioactive source and dummy source, have big cornerite tightening belt and cable sector driving wheel, head installs two that homology kind afterbody not is fixed on the driving wheel and send the source cable, the security mask source storage device, to the radioactive source sent or the detection and location mechanism of dummy source, and the intermediate store of operation source not, what it was concrete is characterized as: 1. it the transmission radioactive source and the driving wheel (1) of the driving mechanism of dummy source on only be connected with the dummy source cable (3) that send source cable (2) and another termination to have dummy source that a termination has radioactive source; 2. in its security mask source storage device (6), be provided with the transducer (7) of a controlled output source kind, it is that an inside has the element that transposition device external belt has the output channel in the input channel in two sources and two sources, it is by valve head, the transposition body, the valve end, tractive magnet, and the flexible pipe composition of inner connection usefulness, wherein its transposition body is positioned between valve head and the valve end, the transposition body can be done the transposition campaign of translation or rotation, the input channel in two sources of transducer connects with the cable sector on driving wheel limit, defeated source capsule road (8) in its two source output channels is received on the intermediate store, and another output channel (9) is delivered to human body through other corresponding mechanism with the source.

Transducer in the present invention provides three kinds of following schemes: the 1. device valve head of this conversion, valve end and transposition body all are cuboids, the transposition body is near the front end face of valve end, certain distance is arranged between transposition body and the valve head, the two through hole that connects the source input channel on the valve head is for horizontal, also have on the transposition body two with it contour equidistant horizontal through hole, in the distance between transposition body and valve head, each connects diplopore between the two with flexible pipe, the front end face of valve end has three contour holes of the horizontal hole with the transposition body, the lateral opening distance of its interstitial hole to two all with the transposition body on the distance of two through hole equate, the transposition body can be done the translation of transposition on the horizontal direction, the distance of transposition translation is the distance in two holes on the transposition body, and two holes before and after the transposition on the transposition body and the interstitial hole and a corresponding lateral opening strictness of valve end align.Valve end rear end face has the hole of two arranged verticals of connection source output channel, the following hole straight hole UNICOM on interstitial hole on the front end face and the rear end face, the last hole straight hole UNICOM of two lateral opening and rear end faces on the front end face; 2. the valve head of this transducer, valve end and transposition body all are that cuboid, transposition body are positioned between valve head, the valve end, and the three contacts with each other cooperation, and the transposition body can be done the transposition translation of horizontal direction.Two holes that connect the source input channel on the valve head are the through hole of arranged vertical, transposition body front end face has totally four holes of two row's arranged verticals, four holes that transposition body rear end face has a row of horizontal to arrange, two horizontal through holes are arranged on the valve end, the D of the left side two arranged verticals of transposition body front end face, the H that E hole and the rear end face left side two are horizontal, K uses in the hole straight hole UNICOM, the F of front end face the right two arranged verticals, the M that G hole and rear end face the right two is horizontal, L uses in the hole straight hole UNICOM, D before the transposition of transposition body, two hole strictnesses on E hole and the valve head align, meanwhile, H, the two through hole strictness of K hole and valve end aligns, F after the transposition, two holes and L on G hole and the valve head, two hole strictnesses of M hole and valve end align, and the distance of transposition body translation transposition is D, distance between the F hole.3. the transposition body in this transducer is to constitute by connecting institute with coilable reed in the middle of two sections cylinders, the leading portion cylinder of transposition body have two with valve head on connect the through hole that two hole strictnesses of source input align, have on the back segment cylinder with the valve end on the two through hole that aligns of two hole strictnesses, two flexible pipe UNICOMs are used in two holes before and after the transposition body on two cylinders respectively, one end of its transposition body is fixed, the other end can be done 180 ° of transpositions and rotate under the tractive magnet effect, the corresponding two hole strictnesses of two Kong Yingyu of rotating part align before and after the transposition.

Intermediate store in this programme is a flat cylindrical box body, and it is by the box body that has central shaft, and lid and moving runner are formed.Wherein its box body and lid constitute an airtight container, its rotor is held on the central shaft by bearing bracket stand, its rotor is the wheel of a short cylindrical shape, face upper shed at one end, there is the space that can hold the source and send the source cable inside, on lid, have the source that is stored can be input in the moving runner and with the joining inclined via-hole of transducer source output channel, the centrage in this hole is vertical with the box body radius and become less acute angle with lid.This is arranged on intermediate store in the security mask source storage device and also can be arranged among other source of bank savings shield facility outside the security mask source storage device.

Adopt this programme can embody following superiority: 1. under the prerequisite that makes dummy source and brachytherapy sources operate as normal equally, to use a cover driving device, simplified the structure of machinery and hardware, the program of the control that simplifies the operation; 2. another source still is retained among the security mask source storage device in output one provenance, has guaranteed handling safety, also avoids the radioactivity width of cloth of surrounding is penetrated pollution; 3. the modular construction of being set up is simple, has reduced the cost of complete machine, is suitable for promoting the use of.

Fig. 1 is the general illustration of the novel source feeding mechanism of this programme; Figure 1A is a vertical view;

Fig. 2, Fig. 3, Fig. 4 are three kinds of embodiment structural representations of transducer.

Fig. 5 is the structural representation of intermediate storage.

Structure and work process below in conjunction with this device of description of drawings, driving wheel (1) is directly installed on the motor (11), around driving wheel, pack tightly with tightening belt (12), send source cable (2) and (3) the head on installing radioactive source and dummy source, adopting miniature radioactive source external form in this programme is Φ 1.1 * 6, radiation source material can adopt iridium 192, dummy source can adopt low dose of radioactive source, its overall dimensions is identical with radioactive source, the cable sector on self-powered driving wheel limit picks out two and send source capsule road (4), (5), transducer (7) and intermediate store (10) all are located among the security mask source storage device (6), the input channel in two sources is connected on the front end of transducer (7), source output channel (9) is received on the intermediate store (10), and another source output channel (18) is delivered to human body through corresponding other mechanism.Valve head 1(13 in first scheme of transducer) external source input channel (4), (5), through two flexible pipes (14), (15), with transposition body 1(16) link, the transposition body can be done the translation of transposition under the effect of tractive magnet (17), valve end 1(18) front end face has A, B, three holes of C, and rear end face has two Kong Yuyuan output channels (8), (9) to connect.Valve head 2(19 in the alternative plan of transducer) through hole of two arranged verticals is arranged, take over road (4), (5), changeing three-dimensional 2(20) front end face has D, E, F, G four holes, rear end face has H, K, L, M four holes, valve end 2(21) have two through holes to take over roads (8), (9), transposition body 2(20 on) under the effect of tractive magnet (17), can do the translation of transposition.Valve head 3(27 in third party's case of transducer) (4), (5) are taken in two holes on, conversion body 3 comprises preceding cylinder (22) but torsion film (23), hose (24), (25) and back cylinder (26), the preceding cylinder (22) of transposition body 3 can be done 180 ° transposition rotation in tractive magnet (27) effect down.Valve end 3(28) connects output channel (8), (9).Lid of intermediate store (29) and box body (30) are tight to be cooperated, and central shaft (31) is held moving runner (32) by bearing bracket stand, has inclined hole to connect with the outlet tube (9) in source on the lid.The security mask source storage device is made up of metal shell and the inner lead of filling, to prevent that ray from penetrating, the everything of this afterloading unit all is to carry out under the digital process control of computer, job initiation guarantees to send earlier the dummy source TCH test channel by digital process, this moment, radioactive source entered intermediate store through pipeline (9), because source and cable are to send into from the tangential direction of lid, with then promote its rotation after moving runner contacts, source and cable are reeled and be stored in the inner space of moving runner, dummy source changes two sources of regaining after testing the rear drive sprocket that puts in place, digital process control makes the transducer transposition when next program is carried, and radioactive source is sent and dummy source enters intermediate store.

The model machine of this programme protects reliably, there is no any abnormal phenomena of appearance through the stable performance of trial run proof.

Claims (5)

1, the novel source feeding mechanism in a kind of brachytherapy sources of afterloader and simulated emission source, it includes the motor power source that drives usefulness, the driving mechanism of one cover transmission radioactive source and dummy source, the driving wheel that has big cornerite tightening belt and cable sector, install two of radioactive source or dummy source at head and send the source cable, the security mask source storage device, to radioactive source or the detection and location mechanism of dummy source and the intermediate store of sending in idle source, it is characterized in that: 1. it the transmission radioactive source and the driving wheel (1) of the driving mechanism of dummy source on only be connected with a termination, have the dummy source cable (3) that send source cable (2) and another termination to have dummy source of radioactive source; 2. be provided with the transducer (7) of a controlled output source kind in its security mask source storage device (6), it is that an inside has the element that transposition device external belt has the output channel in the input channel in two sources and two sources.It by valve head, transposition body, valve end, tractive magnet, and the inner flexible pipe that connects usefulness form, wherein its transposition body is positioned between valve head and the valve end, the transposition body can be done the transposition campaign of translation or rotation, the input channel in two sources of transducer connects with the cable sector on driving wheel limit, defeated source capsule road (8) in its two source output channels is received on the intermediate store, and another output channel (9) is delivered to human body through other corresponding mechanism with the source.

2, according to the described source feeding mechanism of claim 1, the valve head 1(13 that it is characterized in that its transducer (7)), valve end 1(18) and transposition body 1(16) all be cuboid, connect source input pipe logical (4) on the valve head, (5) two through hole is horizontal, two contour equidistant horizontal through holes are also arranged on the transposition body, use flexible pipe (14) between the two, (15) connect, valve end 1(18) front end face has three contour holes of the horizontal hole with the transposition body, the lateral opening distance of its interstitial hole to two all with the transposition body on the distance in two holes equate, transposition body 1(16) can do the translation of the transposition on the horizontal direction, the distance of transposition translation is the distance in two holes on the transposition body, two holes before and after the transposition on its transposition body and the corresponding interstitial hole of valve end and a lateral opening strictness align, valve end rear end face has the hole of two arranged verticals of connection source output channel, the interstitial hole of front end face is connected by straight line pylone with the following hole of rear end face, and two on the front end face lateral openingly connected by straight line pylone with the last hole of rear end face.

3, according to the described source feeding mechanism of claim 1, the valve head 2(19 that it is characterized in that its transducer (7)), valve end 2(21) and transposition body 2(20) all be cuboid, connect source input channel (4) on the valve head, (5) two holes are the through hole of arranged vertical, the both ends of the surface of transposition body contact with valve head and valve end respectively, transposition body 2(20) can do the transposition translation of horizontal direction, transposition body 2(20) front end face has the hole of two row's arranged verticals, the rear end face of transposition body has horizontal four holes of a row, horizontal two through hole is arranged on the valve end, the D of the left side two arranged verticals of transposition body front end face, the H that E hole and the rear end face left side two are horizontal, the K hole connects with straight line pylone, the F of two arranged verticals on front end face the right, G hole and the horizontal M in rear end face the right, the L hole connects with straight line pylone, D before the transposition of transposition body, two through hole strictness on E hole and the valve head aligns, meanwhile, H, K hole and the two hole strictnesses of valve end align, F after the transposition, G hole and valve head two holes and L, M hole and the two hole strictnesses of valve end align, and the distance of transposition body translation transposition is D, distance between the F hole.

4, according to the described source feeding mechanism of claim 1, it is characterized in that the transposition body in its transducer is two sections cylinders (22), (26) connect with coilable reed (23) in the middle of, the leading portion cylinder of transposition body have two with valve head on the through hole that aligns of two hole strictnesses of source input, have on the back segment cylinder with the valve end on the two through hole that aligns of two hole strictnesses, two flexible pipes (24) are used in two holes before and after the transposition body on two cylinders respectively, (25) UNICOM, one end of its transposition body is fixed, the other end can be done 180 ° transposition rotation under the effect of tractive magnet (27), two hole strictnesses of the corresponding correspondence of two Kong Yingyu of rotating part align before and after the transposition.

5, according to the described source feeding mechanism of claim 1, the intermediate store that it is characterized in that it is a flat cylinder box body, it is by the box body that has central shaft (31) (30), lid (29), and moving runner (32) is formed, wherein its box body (30) and lid (29) constitute a hermetic container, its moving runner (32) is held on the central shaft (31) by bearing bracket stand, its rotor is that the wheel of a short cylindrical shape is in its end face upper shed, there is the space that holds the source and send the source cable inside, on lid, have one the source that is stored can be input in the moving runner and with the joining inclined via-hole of source delivery hose (9) of transducer, the centrage in this hole is vertical with the box body radius and become less acute angle with lid.

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