CN215608858U

CN215608858U - Head fixing device for radiotherapy

Info

Publication number: CN215608858U
Application number: CN202121347441.0U
Authority: CN
Inventors: 周巧凤; 何怡
Original assignee: Second Affiliated Hospital of Chongqing Medical University
Current assignee: Second Affiliated Hospital of Chongqing Medical University
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-01-25
Anticipated expiration: 2031-06-17

Abstract

The utility model provides a head fixing device for radiotherapy, and belongs to the technical field of medical instruments. It has solved the current head fixing device for radiotherapy application scope little, the fixed poor problem of effect. The U-shaped frame comprises a bottom plate, a U-shaped frame body and a headrest, wherein a pressing plate is arranged on the inner side of the U-shaped frame body, a head cushion layer is arranged on the inner side face of the pressing plate, an arc-shaped supporting plate is arranged at an opening of the U-shaped frame body, the arc-shaped supporting plate comprises a first supporting plate and a second supporting plate which is symmetrically arranged with the first supporting plate, the first supporting plate is hinged with the second supporting plate, a first adjusting assembly used for adjusting the distance between the pressing plate and the arc-shaped supporting plate is arranged on the U-shaped frame body, and a second adjusting assembly used for adjusting the included angle between the first supporting plate and the second supporting plate is arranged on the first adjusting assembly. The utility model has the advantages of convenient adjustment, good fixing effect, wide application range and the like.

Description

Head fixing device for radiotherapy

Technical Field

The utility model belongs to the technical field of medical instrument, a head fixing device for radiotherapy is related to.

Background

In the modern radiotherapy technology, when the tumor at the head is subjected to radiotherapy, the positioning is required to be accurate, the generally adopted line drawing method is inaccurate in positioning, the head of a patient is easy to slightly shake, the radiotherapy effect is poor, and unnecessary damage is caused to the body of the patient. The head of a patient is fixed in a mould and then radiotherapy is carried out, although the head of the patient can be fixed by the method, the head of the patient is not shaken, the use is very inconvenient, the shape of the fixed mould is fixed, and the fixed mould can not be adjusted according to the self condition of different patients, so that the patients feel very uncomfortable, the pain of the patients is increased, and the curative effect of the radiotherapy is also influenced to a certain extent.

Therefore, the Chinese patent discloses a special head fixing device [ with the publication number of CN205683409U ] for the department of radiotherapy, which comprises a U-shaped headrest and a headrest groove arranged inside the headrest, wherein compressed air bags are symmetrically arranged on the inner sides of two U-shaped end parts of the headrest, the compressed air bags are communicated with the inflated air bags through inflation tubes, valves are arranged on the inflation tubes, the upper surface of the headrest groove is of an arc-shaped structure, flexible protrusions are arranged on the upper surface of the headrest groove, the two U-shaped end parts of the headrest are composed of a sleeve and a supporting cylinder, the sleeve is sleeved on the supporting cylinder, the supporting cylinder is of a solid structure, a plurality of fixing holes are sequentially arranged on the side surface of the supporting cylinder from top to bottom, fastening bolts are arranged on the side surface of the sleeve, internal threads are arranged on the fixing hole wall, and the internal threads are matched with the external threads of the fastening bolts.

The device communicates the compression air bag and the inflation air bag through the inflation tube, so that the accommodation width of the headrest groove is adjusted, and meanwhile, the height of the compression air bag is adjusted through the height of the adjusting sleeve, so that the head fixing effect is guaranteed. However, it can only fix the head from the left and right sides, and is interfered by the position of ears of human body, so the fixing effect is poor.

Disclosure of Invention

The utility model aims at solving the problems in the prior art and providing a head fixing device for radiotherapy with good fixing effect.

The purpose of the utility model can be realized by the following technical scheme:

head fixing device for radiotherapy, including the bottom plate, fix the U type frame on the bottom plate and locate the headrest in the U type frame, the inboard of U type frame is equipped with the clamp plate, the medial surface of clamp plate is the cambered surface, the medial surface of clamp plate is equipped with the head bed course, the opening part of U type frame is equipped with the arc layer board that sets up relatively with the clamp plate, the arc layer board includes first layer board and the second layer board that sets up with first layer board symmetry, first layer board and second layer board articulate the setting, be equipped with the first adjusting part who is used for adjusting the distance between clamp plate and the arc layer board on the U type frame, be equipped with the second adjusting part who is used for adjusting contained angle between first layer board and the second layer board on the first adjusting part, one side of first layer board is equipped with first bed course, one side of second layer board is equipped with the second bed course.

The inner side surface of the pressing plate is a cambered surface and is matched with the top of the head of a human body, so that the pressing plate can be in surface contact with the head of the human body, the contact area is large, the pressure intensity is small, and the fixing effect is good. The head cushion layer, the first cushion layer and the second cushion layer are made of elastic materials, such as rubber, silica gel or sponge. The inboard of first layer board has the first cavity with the cooperation of chin right part, and first bed course is located first cavity, and the inboard of second layer board has the second cavity with the cooperation of chin left part, and the second bed course is located the second cavity, and first cavity has formed jointly with chin complex cavity with the second cavity, and the cooperation clamp plate can realize all around spacing of six directions from top to bottom. The first supporting plate and the second supporting plate are detachably hinged, and when the head enters the U-shaped frame, the first supporting plate is separated from the second supporting plate. During the use, highly select suitable headrest when lying on the back according to human head, the person of being examined arranges the head in the headrest and supports and lean on the clamp plate, is connected first layer board and second layer board afterwards and forms articulated relation, and effect through first adjusting part and second adjusting part makes cavity and chin cooperation, and the cooperation clamp plate has realized spacing in six directions, and is fixed effectual.

In the head fixing device for radiotherapy, a first groove extending transversely is formed in the right side of the U-shaped frame, and a second groove arranged symmetrically to the first groove is formed in the left side of the U-shaped frame; first adjusting part including locate first slider in the first fluting, locate the second slider in the second fluting, wear to locate in first slider and with first slider threaded connection's first regulation pole and wear to locate in the second slider and with second slider threaded connection's second regulation pole, bearing axial positioning is passed through in first fluting at the both ends of first regulation pole, bearing axial positioning is passed through in the second fluting at the both ends of second regulation pole, first layer board locate on the first slider, the second layer board is located on the second slider, the one end that first slider was kept away from to first layer board is articulated with the one end that the second slider was kept away from to the second layer board.

One end of the first adjusting rod and one end of the second adjusting rod extend out of the U-shaped frame, a rotating hand wheel or a handle is arranged on the extending portion of the first adjusting rod and the second adjusting rod, and the first adjusting rod and the second adjusting rod can be controlled to rotate along the central axis of the first adjusting rod and the second adjusting rod by rotating the corresponding hand wheel or handle. The first sliding block is in sliding fit with the first open groove, the first sliding block is limited by the first open groove, the second sliding block is in sliding fit with the second open groove, the second sliding block is limited by the second open groove, when the first adjusting rod rotates, the first sliding block can be driven to move back and forth in the first open groove, and when the second adjusting rod rotates, the second sliding block can be driven to move back and forth in the second open groove, so that the distance between the pressing plate and the arc-shaped supporting plate can be adjusted.

In the head fixing device for radiotherapy, the second adjusting component comprises a third adjusting rod which is arranged on the right side of the U-shaped frame in a penetrating mode and is in threaded fit with the U-shaped frame, a fourth adjusting rod which is arranged on the left side of the U-shaped frame in a penetrating mode and is in threaded fit with the U-shaped frame, a first connecting rod which is arranged at the inner end of the third adjusting rod and can rotate around the central axis of the third adjusting rod, and a second connecting rod which is arranged at the inner end of the fourth adjusting rod and can rotate around the central axis of the fourth adjusting rod, the first supporting plate is hinged to the first connecting rod, and the second supporting plate is hinged to the second connecting rod.

The third adjusting rod is positioned below the first open slot and is vertically arranged with the first adjusting rod; the fourth adjusting rod is positioned below the second groove, and the fourth adjusting rod and the second adjusting rod are vertically arranged. The outer ends of the third adjusting rod and the fourth adjusting rod respectively extend out of the U-shaped frame, and a hand wheel or a handle is arranged on the extending part. The third adjusting rod and the fourth adjusting rod are rotated, the distance between the first connecting rod and the second connecting rod can be adjusted, so that the included angle between the first supporting plate and the second supporting plate is changed, the jaw-type adjustable jaw is suitable for jaws of different sizes, and the application range is wide.

In above-mentioned head fixing device for radiotherapy, the one end that the head pole is close to the third and adjusts the pole is equipped with first shrinkage pool, the opening part of first shrinkage pool is equipped with first spacing fender edge, the one end that the third is close to the head pole stretches into first shrinkage pool, just be equipped with on the third adjusts the pole with first shrinkage pool normal running fit's first round platform.

The first limiting blocking edge can limit the first round table to be separated from the first concave hole.

In above-mentioned head fixing device for radiotherapy, the one end that the second connecting rod is close to the fourth regulation pole is equipped with the second shrinkage pool, the opening part of second shrinkage pool is equipped with the spacing fender edge of second, the one end that the fourth regulation pole is close to the second connecting rod stretches into the second shrinkage pool, just be equipped with on the fourth regulation pole with second shrinkage pool normal running fit's second round platform.

The second limiting blocking edge can limit the second round platform to be separated from the second concave hole.

In the head fixing device for radiotherapy, one end of the first supporting plate, which is close to the second supporting plate, is provided with a first extension part, the end part of the first extension part is provided with a U-shaped hinged seat, one end of the second supporting plate, which is close to the first supporting plate, is provided with a second extension part, and the first extension part is hinged with the hinged seat through a pin shaft.

During connection, the second extension part is placed into the hinge base, the hinge holes in the hinge base and the second extension part are aligned, and then the hinge pin is inserted to realize the hinge connection of the second extension part and the hinge base. During disassembly, the pin shaft is pulled out upwards, and then the second extending part is separated from the hinge seat.

In above-mentioned head fixing device for radiotherapy, the clamp plate is two and bilateral symmetry sets up, be equipped with two bracing pieces that set up with the clamp plate one-to-one on the U type frame, the clamp plate is articulated with the bracing piece that corresponds the setting with it, the bracing piece is worn to establish in the U type frame, be equipped with the locking bolt that is used for locking the bracing piece on the U type frame.

Compared with the prior art, the head fixing device for radiotherapy has the following advantages:

the inner side surface of the pressing plate is a cambered surface and is adapted to the top of the head of a human body, so that the pressing plate can be ensured to be in contact with the head surface of the human body, the contact area is large, the pressure intensity is small, and the fixing effect is good; the first adjusting component and the second adjusting component are arranged, so that the head fixing device can adapt to the fixation of heads with different sizes, and the application range is wide; the adjustment is convenient, stable and reliable.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Fig. 2 is a schematic connection diagram of a third adjusting rod and a first connecting rod provided by the utility model.

Fig. 3 is a schematic diagram of the hinge connection of the first support plate and the second support plate provided by the utility model.

In the figure, 1, a U-shaped frame; 2. pressing a plate; 3. a head cushion layer; 4. a first pallet; 5. a second pallet; 6. a first cushion layer; 7. a second cushion layer; 8. a first slot; 9. a first slider; 10. a first adjusting lever; 11. a second adjusting lever; 12. a third adjusting rod; 13. a fourth adjusting lever; 14. a first connecting rod; 15. a second connecting rod; 16. a first limit stop edge; 17. a first circular table; 18. a first extension portion; 19. a hinged seat; 20. a second extension portion; 21. a pin shaft; 22. a support bar; 23. and locking the bolt.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

The head fixing device for radiotherapy shown in fig. 1 comprises a bottom plate, a U-shaped frame 1 fixed on the bottom plate and a headrest arranged in the U-shaped frame 1, wherein the bottom plate and the headrest are not shown in the figure, a human body lies on the bottom plate during detection, the head is positioned between the U-shaped frames 1 and acts on the headrest, and the headrests with different sizes can be selected according to different heights of the head of the human body, so that the head is always positioned at the position for radiotherapy.

As shown in figure 1, a pressing plate 2 is arranged on the inner side of a U-shaped frame 1, the inner side surface of the pressing plate 2 is an arc surface, a head cushion layer 3 is arranged on the inner side surface of the pressing plate 2, and the shape of the head cushion layer 3 is the same as that of the inner side surface of the pressing plate 2, is an arc surface and is matched with the shape of the top of the head of a human body.

In this embodiment, as shown in fig. 1, the two pressing plates 2 are symmetrically arranged, the U-shaped frame 1 is provided with two supporting rods 22 which are arranged corresponding to the pressing plates 2 one by one, the pressing plates 2 are hinged to the supporting rods 22 arranged corresponding to the pressing plates, the supporting rods 22 are arranged in the U-shaped frame 1 in a penetrating manner, and the U-shaped frame 1 is provided with locking bolts 23 for locking the supporting rods 22. The pressing plate 2 can rotate around the hinged point of the pressing plate and the supporting rod 22, so that the head cushion layer 3 can perfectly fit the head of a human body, and the limiting effect on the head of the human body is good.

As shown in fig. 1, an arc-shaped supporting plate is arranged at an opening of the U-shaped frame 1 and opposite to the pressing plate 2, the arc-shaped supporting plate comprises a first supporting plate 4 and a second supporting plate 5 symmetrically arranged with the first supporting plate 4, one end of the first supporting plate 4 close to the second supporting plate 5 is hinged to one end of the second supporting plate 5 close to the first supporting plate 4, a first adjusting component for adjusting the distance between the pressing plate 2 and the arc-shaped supporting plate is arranged on the U-shaped frame 1, and a second adjusting component for adjusting the included angle between the first supporting plate 4 and the second supporting plate 5 is arranged on the first adjusting component. As shown in fig. 1, a first cushion 6 is provided on one side of the first palette 4, and a second cushion 7 is provided on one side of the second palette 5. In this embodiment, the head cushion 3, the first cushion 6 and the second cushion 7 are made of elastic materials, such as rubber, silica gel or sponge.

In this embodiment, the inboard of first layer board 4 has the first cavity with the cooperation of chin right part, first bed course 6 is located first cavity, the inboard of second layer board 5 has the second cavity with the cooperation of chin left part, second bed course 7 is located the second cavity, first cavity has formed the cavity with chin complex with the second cavity jointly, this cavity can perfectly wrap up and hold or wrap up and hold the chin, cooperation clamp plate 2 can realize the spacing of six directions all around, about, from top to bottom.

The first supporting plate 4 and the second supporting plate 5 form a detachable hinge joint, and when the head enters the U-shaped frame 1, the first supporting plate 4 is separated from the second supporting plate 5. During the use, highly select suitable headrest when lying on the back according to human head, the person of being examined arranges the head in the headrest and supports and lean on clamp plate 2, is connected first layer board 4 and second layer board 5 afterwards and forms articulated relation, and effect through first adjusting part and second adjusting part makes cavity and chin cooperation, and cooperation clamp plate 2 has realized spacing in six directions, and is fixed effectual.

Specifically, as shown in fig. 1 and 3, a first extending portion 18 is disposed at one end of the first supporting plate 4 close to the second supporting plate 5, a U-shaped hinge seat 19 is formed at an end of the first extending portion 18, a second extending portion 20 is disposed at one end of the second supporting plate 5 close to the first supporting plate 4, and the first extending portion 18 is hinged to the hinge seat 19 through a pin 21. When the second extension part 20 is connected, the second extension part 20 is placed in the hinge seat 19, the hinge holes on the hinge seat 19 and the second extension part 20 are aligned, and then the pin 21 is inserted to realize the hinge connection of the second extension part 20 and the hinge seat 19. During disassembly, the pin 21 is pulled upwards and the second extension 20 is then separated from the hinge seat 19.

As shown in fig. 1, a first slot 8 extending transversely is formed in the right side of the U-shaped frame 1, and a second slot symmetrically arranged with the first slot 8 is formed in the left side of the U-shaped frame 1; first adjusting part is including locating first slider 9 in first fluting 8, locate the second slider in the second fluting, wear to locate in first slider 9 and with first slider 9 threaded connection's first regulation pole 10 and wear to locate in the second slider and with second slider threaded connection's second regulation pole 11, bearing axial positioning is passed through in first fluting 8 at the both ends of first regulation pole 10, bearing axial positioning is passed through in the second fluting at the both ends of second regulation pole 11, first layer board 4 is located on first slider 9, second layer board 5 is located on the second slider, the one end that first slider 9 was kept away from to first layer board 4 is articulated with the one end that second slider was kept away from to second layer board 5.

One end of the first adjusting rod 10 and one end of the second adjusting rod 11 extend out of the U-shaped frame 1, a rotating hand wheel or a rotating handle is arranged on the extending portion of the first adjusting rod 10 and the second adjusting rod 11, and the first adjusting rod 10 and the second adjusting rod 11 can be controlled to rotate along the central axis of the first adjusting rod and the second adjusting rod by rotating the corresponding hand wheel or the corresponding rotating handle. The first sliding block 9 is in sliding fit with the first open groove 8, the first sliding block 9 is limited by the first open groove 8, the second sliding block is in sliding fit with the second open groove, the second sliding block is limited by the second open groove, when the first adjusting rod 10 rotates, the first sliding block 9 can be driven to move back and forth in the first open groove 8, and when the second adjusting rod 11 rotates, the second sliding block can be driven to move back and forth in the second open groove, so that the distance between the pressing plate 2 and the arc-shaped supporting plate can be adjusted.

In this embodiment, the second adjusting assembly includes a third adjusting rod 12 penetrating the right side of the U-shaped frame 1 and in threaded fit with the U-shaped frame 1, a fourth adjusting rod 13 penetrating the left side of the U-shaped frame 1 and in threaded fit with the U-shaped frame 1, a first connecting rod 14 arranged at the inner end of the third adjusting rod 12 and capable of rotating around the central axis of the third adjusting rod 12, and a second connecting rod 15 arranged at the inner end of the fourth adjusting rod 13 and capable of rotating around the central axis of the fourth adjusting rod 13, the first supporting plate 4 is hinged to the first connecting rod 14, and the second supporting plate 5 is hinged to the second connecting rod 15.

The third adjusting rod 12 is positioned below the first open slot 8, and the third adjusting rod 12 is perpendicular to the first adjusting rod 10; the fourth adjusting rod 13 is positioned below the second slot, and the fourth adjusting rod 13 is perpendicular to the second adjusting rod 11. The outer ends of the third adjusting rod 12 and the fourth adjusting rod 13 respectively extend out of the U-shaped frame 1, and a hand wheel or a handle is arranged on the extending part. The third adjusting rod 12 and the fourth adjusting rod 13 are rotated, so that the distance between the first connecting rod 14 and the second connecting rod 15 can be adjusted, the included angle between the first supporting plate 4 and the second supporting plate 5 is changed, the jaw-type jaw is suitable for jaws of different sizes, and the application range is wide.

As shown in fig. 2, a first concave hole is formed at one end of the first connecting rod 14 close to the third adjusting rod 12, a first limiting edge 16 is arranged at an opening of the first concave hole, one end of the third adjusting rod 12 close to the first connecting rod 14 extends into the first concave hole, and a first round table 17 rotatably matched with the first concave hole is arranged on the third adjusting rod 12. The first limit stop edge 16 can limit the first round table 17 from falling out of the first concave hole.

One end of the second connecting rod 15, which is close to the fourth adjusting rod 13, is provided with a second concave hole, the opening of the second concave hole is provided with a second limiting blocking edge, one end of the fourth adjusting rod 13, which is close to the second connecting rod 15, extends into the second concave hole, and the fourth adjusting rod 13 is provided with a second round table which is in running fit with the second concave hole. The second limiting blocking edge can limit the second round platform to be separated from the second concave hole.

The use method of the head fixing device comprises the following steps:

the pin 21 is pulled out from bottom to top to separate the first extension 18 from the second extension 20, and then the first support plate 4 is rotated around the hinge point between the first support plate and the first connecting rod 14, and the second support plate 5 is rotated around the hinge point between the second support plate and the second connecting rod 15, so that the distance between the first support plate 4 and the second support plate 5 is maximized. Then, the head of the human body enters the U-shaped frame 1, after the position is adjusted, the first supporting plate 4 and the second supporting plate 5 are rotated, the second extending part 20 enters the hinge seat 19, and the second extending part 20 is hinged with the hinge seat 19 through the pin shaft 21. Then, the first adjusting rod 10 and the second adjusting rod 11 are synchronously rotated in the same direction, so that the first sliding block 9 moves in the first slot 8, the second sliding block synchronously moves in the second slot, the first supporting plate 4 and the second supporting plate 5 are driven to be close to the chin, and the head of the human body is fixed through the pressing plate 2, the first supporting plate 4 and the second supporting plate 5.

And finally, the third adjusting rod 12 and the fourth adjusting rod 13 can be adjusted, so that the first supporting plate 4 and the second supporting plate 5 are perfectly attached to the chin, the contact area is increased, the pressure intensity is reduced, and the comfort is improved.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit of the utility model or exceeding the scope of the claims.

Claims

1. A head fixing device for radiotherapy comprises a bottom plate, a U-shaped frame (1) fixed on the bottom plate and a headrest arranged in the U-shaped frame (1), and is characterized in that a pressing plate (2) is arranged on the inner side of the U-shaped frame (1), the inner side of the pressing plate (2) is an arc surface, a head cushion layer (3) is arranged on the inner side of the pressing plate (2), an arc-shaped supporting plate opposite to the pressing plate (2) is arranged at an opening of the U-shaped frame (1), the arc-shaped supporting plate comprises a first supporting plate (4) and a second supporting plate (5) symmetrically arranged with the first supporting plate (4), the first supporting plate (4) and the second supporting plate (5) are hinged, a first adjusting component for adjusting the distance between the pressing plate (2) and the arc-shaped supporting plate is arranged on the U-shaped frame (1), and a second adjusting component for adjusting the included angle between the first supporting plate (4) and the second supporting plate (5) is arranged on the first adjusting component, one side of the first supporting plate (4) is provided with a first cushion layer (6), and one side of the second supporting plate (5) is provided with a second cushion layer (7).

2. The head fixing device for radiotherapy as claimed in claim 1, wherein the right side of the U-shaped frame (1) is opened with a first slot (8) extending transversely, and the left side of the U-shaped frame (1) is opened with a second slot arranged symmetrically to the first slot (8); the first adjusting assembly comprises a first sliding block (9) arranged in a first groove (8), a second sliding block arranged in a second groove, a first adjusting rod (10) penetrating through the first sliding block (9) and connected with the first sliding block (9) in a threaded mode, and a second adjusting rod (11) penetrating through the second sliding block and connected with the second sliding block in a threaded mode, the two ends of the first adjusting rod (10) are axially positioned in the first groove (8) through bearings, the two ends of the second adjusting rod (11) are axially positioned in the second groove through bearings, a first supporting plate (4) is arranged on the first sliding block (9), a second supporting plate (5) is arranged on the second sliding block, and one end, far away from the first sliding block (9), of the first supporting plate (4) is hinged to one end, far away from the second sliding block, of the second supporting plate (5).

3. The head fixing device for radiotherapy according to claim 1, wherein the second adjusting assembly comprises a third adjusting rod (12) penetrating the right side of the U-shaped frame (1) and in threaded fit with the U-shaped frame (1), a fourth adjusting rod (13) penetrating the left side of the U-shaped frame (1) and in threaded fit with the U-shaped frame (1), a first connecting rod (14) arranged at the inner end of the third adjusting rod (12) and capable of rotating around the central axis of the third adjusting rod (12), and a second connecting rod (15) arranged at the inner end of the fourth adjusting rod (13) and capable of rotating around the central axis of the fourth adjusting rod (13), the first supporting plate (4) is hinged to the first connecting rod (14), and the second supporting plate (5) is hinged to the second connecting rod (15).

4. The head fixing device for radiotherapy according to claim 3, characterized in that a first concave hole is formed at one end of the first connecting rod (14) close to the third adjusting rod (12), a first limit stop edge (16) is arranged at the opening of the first concave hole, one end of the third adjusting rod (12) close to the first connecting rod (14) extends into the first concave hole, and a first round table (17) which is rotatably matched with the first concave hole is arranged on the third adjusting rod (12).

5. The head fixing device for radiotherapy according to claim 4, wherein a second concave hole is formed at one end of the second connecting rod (15) close to the fourth adjusting rod (13), a second limit stop edge is arranged at an opening of the second concave hole, one end of the fourth adjusting rod (13) close to the second connecting rod (15) extends into the second concave hole, and a second round table rotatably matched with the second concave hole is arranged on the fourth adjusting rod (13).

6. The head fixing device for radiotherapy according to claim 1, wherein a first extending portion (18) is provided at one end of the first supporting plate (4) close to the second supporting plate (5), a U-shaped hinge seat (19) is formed at an end of the first extending portion (18), a second extending portion (20) is provided at one end of the second supporting plate (5) close to the first supporting plate (4), and the first extending portion (18) is hinged to the hinge seat (19) through a pin shaft (21).

7. The head fixing device for radiotherapy according to claim 1, wherein the pressing plates (2) are arranged symmetrically left and right, two support rods (22) are arranged on the U-shaped frame (1) and correspond to the pressing plates (2) one by one, the pressing plates (2) are hinged to the support rods (22) arranged correspondingly, the support rods (22) penetrate through the U-shaped frame (1), and the U-shaped frame (1) is provided with locking bolts (23) for locking the support rods (22).