CN2722390Y

CN2722390Y - Focusing and switching primary collimator of radiative device

Info

Publication number: CN2722390Y
Application number: CN 200420037216
Authority: CN
Inventors: 沈洪; 张千护
Original assignee: HUAYUAN GAMA MEDICAL EQUIPMENT INVESTMENT CO Ltd HANGZHOU
Current assignee: HUAYUAN GAMA MEDICAL EQUIPMENT INVESTMENT CO Ltd HANGZHOU
Priority date: 2004-06-29
Filing date: 2004-06-29
Publication date: 2005-08-31
Anticipated expiration: 2014-06-29

Abstract

The utility model discloses a focusing type primary collimator capable of opening and closing in the radiative device. One surface of the static block and one surface of the dynamic block are respectively processed into 22 square grooves in concave-convex interphase type which are distributed in a fan shape taking the same focus point as the center. The surfaces of the 22 square grooves in concave-convex type of the static block and the surfaces of the 22 square grooves in convex-concave type of the dynamic block are meshed with each other in a tongue and groove type. The dynamic block is fixed on a switch sliding block, and the lower end of one surface of the switch sliding block is provided with a screw nut. The screw nut forms a screw rod pair together with a screw rod which is fixed with a belt wheel by a bearing. The bottom of the switch sliding block and a bottom shielding block form a guide rail pair. A motor drives the screw rod to rotate by the belt wheel, and the screw rod pair drives the switch sliding block and the dynamic block to conduct translatory movement on the guide rail pair, so as to open the radiation path of the radioactive source or to close the ray path. The primary collimator can serve as a source switch, and also can provide a focus path. Besides slow opening and closing, the primary collimator can conduct quick opening and closing to protect critical organs which are likely to be endangered in the scanning treatment. The utility model can change the size of the ray path and the shape of the output power group, so as to satisfy the requirements of the focus shape adapting.

Description

But the example of primary collimator of the focusing switch in the radiation appliance

Affiliated technical field

The utility model relates to a kind of radiation appliance, but relates in particular to the example of primary collimator of the focusing switch in a kind of radiation appliance.

Background technology

In order to improve the suitable shape ability of gamma ray radiator, collimating apparatus must be accomplished and can be exchanged.This moment must active switch between radiation source and collimating apparatus, and this switch also will play the effect of example of primary collimator when opening, and one group of focus channel is provided.Otherwise, will scurry row between adjacent two sources, cause big geometric penumbra.Existing collimating apparatus does not possess this function of not only having made source switch but also focus channel being provided.

Summary of the invention

Not only make source switch, but also provide the example of primary collimator of the focusing switch in a kind of radiation appliance of focus channel function but the purpose of this utility model is to provide.

In order to achieve the above object, the technical solution adopted in the utility model is as follows:

Be processed into 22 square grooves of concavo-convex alternate shape respectively at a quiet face with motion block, article 22, square groove is that the center is fan-shaped distribution with same focus point all, 22 concave-convex square groove faces of quiet cooperate with 22 convex concave square groove faces of motion block respectively, i.e. the tongue and groove occlusion structures; Another face of motion block is the plane, it is fixed on the plane of switch slide block, the bottom surface of switch slide block and bottom surface shielding slab are formed guideway, with the lower end, switch slide block plane that is fixed with the opposite side of motion block nut is installed, nut and screw mandrel are formed and screw pair, and screw mandrel is fixed by bearing and belt wheel.Motor drives screw mandrel by belt wheel and rotates, and screw pair driving switch slide block and motion block are done translation motion on guideway.

Article 22, the center line angle of focusing square groove is 50 °, mounted in advance 22 radioactive source centrally aligneds during 22 focusing square holes of after the interlock quiet and motion block press from both sides with the source of portion mounted thereto, but become the example of primary collimator of focusing switch.

The useful effect that the utlity model has is:

1. example of primary collimator of the present utility model adopts the tongue and groove occlusion structure, forms focus channel when opening, and closely closes ray channel when closed;

2. the digital control scheme controlled motion is adopted in the folding of collimating apparatus, and except shielding needed slow folding, the vitals that may jeopardize in the treatment scanning were protected in folding rapidly, or reached the purpose of control radiation dose;

3. example of primary collimator of the present utility model can be controlled the size of opening by digital control scheme, changes the energy group shape of secondary collimator output, to satisfy the requirement of the suitable shape of focus;

4. when removing secondary collimator, can form big ray open country separately, make the application mode of gamma ray radiator versatile and flexible by this example of primary collimator.

Description of drawings

Fig. 1 is a structural principle synoptic diagram of the present utility model;

Fig. 2 is the synoptic diagram after the utility model source switch is opened;

Fig. 3 is the A-A cut-open view of Fig. 1;

Fig. 4 is the assembling synoptic diagram of half quiet and half motion block of the present utility model;

Fig. 5 is the B-B cut-open view of Fig. 4;

Fig. 6 is the vertical view of Fig. 4;

Fig. 7 is the upward view of Fig. 4.

Among the figure: 1, quiet, 2, motion block, 3, the source folder, 4, radioactive source, 5, the switch slide block, 6, guideway, 7, nut, 8, screw mandrel, 9, bearing, 10, belt wheel, 11, the bottom surface shielding slab.

Embodiment

As Fig. 1～shown in Figure 7, the utility model comprises: 22 square grooves that are processed into concavo-convex alternate shape at a face of quiet 1 and motion block 2 respectively, article 22, square groove is that the center is fan-shaped distribution with same focus point all, 22 concave-convex square groove faces of quiet 1 cooperate with 22 convex concave square groove faces of motion block 2 respectively, i.e. the tongue and groove occlusion structures; Another face of motion block 2 is the plane, it is fixed on the plane of switch slide block 5, the bottom surface of switch slide block 5 and bottom surface shielding slab 11 are formed guideway 6, with the lower end, switch slide block 5 plane that is fixed with motion block 2 opposite sides nut 7 is installed, nut 7 and screw mandrel 8 are formed and screw pair, and screw mandrel 8 is fixing by bearing 9 and belt wheel 10.Motor drives screw mandrel 8 by belt wheel 10 and rotates, and screw pair driving switch slide block 5 and motion block 2 are done translation motion on guideway 6, but become the example of primary collimator of switch.

Article 22, the center line angle of focusing square groove is 50 °, mounted in advance 22 radioactive source 4 centrally aligneds in 22 the focusing square holes of after the interlock quiet 1 and motion block 2 and the source folder 3 of portion mounted thereto, but become the example of primary collimator of focusing switch.

Principle of work of the present utility model is as follows:

At ordinary times, the concavo-convex groove face of quiet 1 and motion block 2 is closely interlock mutually, and the radioactive source 4 downward radiation passages that are contained in the source folder 3 are closed (as shown in Figure 1).

When needing the treatment irradiation, motor rotation drives screw mandrel 8 by belt wheel 10 and rotates, and screw mandrel rotates and does translation motion by nut 7 Drawing switch slide blocks 5 and motion block 2 along guideway 6, opens the passage (as shown in Figure 2) of radioactive source 4 downward radiations.

22 tongue and grooves of quiet 1 and motion block 2 form 22 radioactive source radiation channels, and they are fan-shaped distribution and focus on a bit, but constitute the example of primary collimator of focusing switch.Motion block 2 can slowly can be fast by computer control along moving of guide rail 6, and computing machine can also be controlled the size that radioactive source 4 radiation channels are opened.

The following installation secondary collimator of example of primary collimator changes the aperture of secondary collimator radiation channel, can change the size of the energy group shape of output.Remove secondary collimator, can directly form the large radiation passage by this example of primary collimator.

Claims

1. but the example of primary collimator of the focusing switch in the radiation appliance, it is characterized in that: 22 square grooves that are processed into concavo-convex alternate shape at a face of quiet (1) and motion block (2) respectively, article 22, square groove is that the center is fan-shaped distribution with same focus point all, 22 concave-convex square groove faces of quiet (1) respectively and 22 convex concave square groove faces of motion block (2) cooperate i.e. tongue and groove occlusion structures; Another face of motion block (2) is the plane, it is fixed on the plane of switch slide block (5), the bottom surface of switch slide block (5) and bottom surface shielding slab (11) are formed guideway (6), with switch slide block (5) lower end, plane that is fixed with the opposite side of motion block (2) nut (7) is installed, nut (7) and screw mandrel (8) are formed screw pair, and screw mandrel (8) is fixing by bearing (9) and belt wheel (10); Motor drives screw mandrel (8) by belt wheel (10) and rotates, and screw pair driving switch slide block (5) and motion block (2) are done translation motion on guideway (6).

2. but the example of primary collimator of the focusing switch in a kind of radiation appliance according to claim 1, it is characterized in that: the center line angle of 22 focusing square grooves is 50 °, the source of quiet (1) after the interlock and 22 focusing square holes of motion block (2) and portion mounted thereto presss from both sides mounted in advance 22 radioactive sources (4) centrally aligned in (3), but becomes the example of primary collimator of focusing switch.