CN111714792B

CN111714792B - Shank fixed knot constructs for radiotherapy

Info

Publication number: CN111714792B
Application number: CN202010621609.6A
Authority: CN
Inventors: 张艳玲; 冉凤伟; 杨攀
Original assignee: First Affiliated Hospital of Army Medical University
Current assignee: First Affiliated Hospital of Army Medical University
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2022-03-08
Anticipated expiration: 2040-06-30
Also published as: CN111714792A

Abstract

The invention relates to the technical field of medical instruments, and particularly discloses a leg fixing structure for radiotherapy, which comprises a supporting plate and a fixing seat connected to the supporting plate, wherein first arc-shaped grooves are formed in two sides of the fixing seat, rotating plates are rotatably connected to two sides of the fixing seat, a fixing part is rotatably connected to the rotating plates, a second arc-shaped groove is formed in the fixing part, a fixing gap for fixing a leg can be formed between the second arc-shaped groove and the first arc-shaped groove, and a fixing mechanism for fixing the rotating plates is arranged between the rotating plates and the fixing seat. The leg fixing device fixes the leg of a patient through the first annular groove and the second annular groove, and solves the problem that the radiotherapy effect is reduced because the leg is easy to move towards two sides during radiotherapy in the prior art.

Description

Shank fixed knot constructs for radiotherapy

Technical Field

The invention relates to the technical field of medical instruments, in particular to a leg fixing structure for radiotherapy.

Background

In the radiotherapy process, rays can be accurately positioned, so that whether radiotherapy can be smoothly finished in the radiotherapy process is directly related to whether a patient can keep the body position unchanged and the body is stable, the irradiation position of the patient can be shifted if the patient moves slightly, the radiotherapy effect is reduced, and normal cells can be possibly damaged.

Because patient lies in the backup pad and is in the state of lying on the back for a long time at shank radiotherapy in-process, because patient's heel is the circular arc shape behind the foot, so patient's shank is very easily rocked to the left and right sides in radiotherapy in-process, the solution at present is to control the foot or use the bandage to tie up the foot by patient oneself, make the sole be vertical state, but these two kinds of mode patient all can feel tired, patient feels tired or aching and painful in the foot, radiotherapy in-process patient moves about and causes the radiotherapy deviation easily involuntarily, especially to the active children, the condition that can't accurately carry out the radiotherapy to the shank appears more easily.

Disclosure of Invention

The invention aims to provide a leg fixing structure for radiotherapy, which solves the problem that the radiotherapy effect is reduced because legs are easy to move towards two sides during radiotherapy in the prior art.

In order to solve the problems, the technical scheme of the invention is as follows: the utility model provides a shank fixed knot constructs for radiotherapy, includes the backup pad and connects the fixing base in the backup pad, and open the both sides of fixing base has first arc wall, and the both sides of fixing base are all rotated and are connected with the rotor plate, rotate on the rotor plate and are connected with the fixed part, and it has the second arc wall to open on the fixed part, and second arc wall and first arc wall can form the fixed clearance that is used for fixed shank, are equipped with the fixed establishment who is used for fixed rotor plate between rotor plate and the fixing base.

The principle of the technical scheme is as follows: the supporting plate is used for supporting a patient, so that the patient can conveniently lie on the supporting plate to receive radiotherapy treatment; the two sides of the fixed seat are provided with first arc-shaped grooves, the fixed part is provided with a second arc-shaped groove, when the rotating plate is rotated, the fixed part rotates along with the rotating plate, so that a fixed gap for fixing the leg is formed by the first arc-shaped groove and the second arc-shaped groove in a surrounding mode, then the fixed plate is fixed by the fixing mechanism, the fixed plate is prevented from rotating again, the first arc-shaped groove and the second arc-shaped groove are enabled to keep the state of fixing the leg, deviation of a radiotherapy position caused by displacement of the leg in the radiotherapy process is avoided, and smooth radiotherapy is facilitated; simultaneously, the fixed part rotates to be connected on the rotor plate for the fixed part can revolute the rotor plate and rotate, and at the in-process that rotates the rotor plate, the fixed part rotates to the second arc wall and contacts the back with patient's shank, can be according to the big or small automatically regulated angle of patient's shank, thereby makes the shank fixed between first arc wall and second arc wall.

The beneficial effects of this technical scheme lie in:

1. can make radiotherapy accurately go on: in contrast to using elastic bands or relying on the patient's own control of the leg to remain stationary, the patient's leg is prone to error during the course of radiation therapy due to poor control. In this application, the arc wall that utilizes to set up on fixing base and the fixed part is fixed patient's shank to avoid the condition that the aversion appears in radiotherapy in-process shank, ensure going on smoothly of radiotherapy.

2. Can fix the shank of different size patients: in this application, because first arc wall and second arc wall form the fixed clearance that is used for fixed shank jointly, and under the rotor plate can the pivoted circumstances, the fixed part can also rotate along the rotor plate, thereby can adjust the angle of fixed part according to actual conditions when making the fixed part be close to the fixing base, so that the second arc wall is adjustable for the angle of first arc wall, consequently when utilizing second arc wall with patient's shank "lock" to first arc wall on, no matter how big or small patient's shank, can both accomplish the fixed to the shank smoothly, thereby make the fixed knot structure in this application can be applicable to the patient of different types.

Furthermore, the fixed seat is connected with the supporting plate in a sliding mode, and a locking mechanism is arranged on the fixed seat.

In this scheme, more optimally, fixing base sliding connection is in the backup pad, and the convenient shank to the patient of different heights is fixed, and after sliding the fixing base to suitable position, utilize locking mechanical system fixed with the fixing base and in the backup pad, guarantee that the radiotherapy is accurate and go on steadily.

Further, fixed establishment includes arc and inserted bar, and arc fixed connection is in the tip of fixing base, and the inserted bar is connected on the rotor plate, and opens the fixed orifices that can insert the inserted bar on the arc, and the quantity of fixed orifices is a plurality of and a plurality of fixed orifices is the arc and arranges.

In the scheme, the fixing mechanism comprises an arc-shaped plate and an inserting rod, a plurality of fixing holes arranged in an arc-shaped arrangement are formed in the arc-shaped plate, when the rotating plate is rotated, the inserting rod connected to the rotating plate can be inserted into different fixing holes, so that an included angle between the rotating plate and the arc-shaped plate is changed, after the inserting rod is inserted into the fixing holes, the fixing holes limit the inserting rod, the rotating plate and the fixing seat are fixed by the inserting rod, the position of the rotating plate is not changed any more, and radiotherapy is facilitated; because the quantity of fixed orifices is a plurality of, consequently rotating pivoted in-process, can rotating the rotor plate to suitable angle, then insert the inserted bar in suitable jack again for second arc wall on the fixed part is fixed the shank smoothly.

Furthermore, the inserted link is connected on the rotating plate in a sliding way, and an elastic reset piece is arranged between the inserted link and the rotating plate; the inserted bar includes path section and major diameter section, and it has the spread groove to open between the adjacent fixed orifices, and the width of spread groove is greater than path section diameter and is less than the diameter of major diameter section, and when elasticity reset piece was in natural state, the major diameter section was located the fixed orifices.

In the scheme, preferably, adjacent fixed holes are communicated through a connecting groove to enable all the fixed holes to be communicated, the inserted rod is connected to the rotating plate in a sliding mode, an elastic reset piece is arranged between the inserted rod and the rotating plate, when the elastic reset piece is in a natural state, the large-diameter section of the inserted rod is inserted into the fixed holes to enable the position of the rotating plate to be fixed, when the rotating plate needs to be adjusted to different angles, the inserted rod is pressed to enable the small-diameter section to be located in the fixed holes, then the rotating plate is rotated, the small-diameter section can slide through the connecting groove to enable the small-diameter section to enter different fixed holes, after the position of the rotating plate is adjusted, extrusion on the inserted rod is released, the large-diameter section of the inserted rod is inserted into a new fixed hole under the restoring force of the elastic reset piece, fixing on the rotating plate is automatically achieved, and the sliding of the small-diameter section is guided in the whole process, the rotating plate can rotate stably and accurately, and the rotating plate is convenient to operate and simple in structure.

Further, the large-diameter section and the small-diameter section are in smooth transition.

In this scheme, more preferably, set big footpath section and path section to smooth transition, be favorable to big footpath section to fix the rotor plate after inserting the fixed orifices more smoothly.

Furthermore, a driven piston cylinder is fixedly connected to the rotating plate, a driven piston plate is connected to the driven piston cylinder in a sliding mode, a driven piston rod is fixedly connected to the driven piston plate, and the rotating plate is hinged to the driven piston rod; the support plate is fixedly connected with an active piston cylinder, an active piston plate is connected in the active piston cylinder in a sliding manner, an active piston rod is fixedly connected on the active piston plate, and a connecting rod is hinged between the active piston rod and the rotating plate; an air pipe is communicated between the driving piston cylinder and the driven piston cylinder.

In the scheme, when the rotating plate is rotated to drive the fixing part to fix the leg of the patient, the rotating plate increases the air pressure in the driving piston cylinder through the connecting rod, and the air in the driving piston cylinder is pressed into the driven piston cylinder through the air pipe, so that the driven piston plate in the driven piston cylinder slides towards the direction close to the leg of the patient, the fixing part is enabled to be close to the leg of the patient quickly, and the fixing efficiency is improved; meanwhile, because the gas in the driving piston cylinder and the driven piston cylinder can be compressed, the extrusion force when the leg is fixed by the fixing part and the gas pressure in the driven piston cylinder form balance, when the rotating plate is fixed by inserting the large-diameter section of the inserted link into the fixing hole, the fixing hole is arranged at intervals rather than continuously, when the leg is fixed by the fixing part, the small-diameter end of the inserted link can be positioned in the connecting groove, at the moment, the large-diameter section must be rotated to the nearest fixing hole nearby, the force for fixing the leg is too large or too small, and the patient can not feel comfortable, in the scheme, because the driving piston cylinder and the driven piston cylinder are arranged, the adjustable range of the fixing part is enlarged, and therefore, when the inserted link can not be opposite to the proper fixing hole, the gas pressure in the driving piston cylinder and the driven piston cylinder is slightly changed by extruding the driven piston cylinder, the insertion rod is aligned with the fixing hole by changing the position of the driven piston plate, so that the position of the rotating plate is fixed, and the leg of the patient can be well fixed; simultaneously, because gas can be compressed in the initiative piston cylinder and the driven piston cylinder, has certain and cushioning effect, can avoid on the fixed part second arc wall once only to exert too big pressure and weigh patient's shank to patient's shank.

Furthermore, the connecting plate of fixedly connected with L type on the fixing base, it has first spout to open in the backup pad, and first spout is passed to the vertical section of connecting plate, and the horizontal segment of connecting plate is located the below of backup pad and extends to the below of rotor plate, and initiative piston cylinder fixed connection is on the horizontal segment of connecting plate.

In this scheme, utilize the connecting plate to fix the initiative piston cylinder, when the slip fixing base, can pass through the removal of connecting plate synchronous drive initiative piston cylinder to guarantee the stable connection of initiative piston cylinder and slave piston cylinder.

Furthermore, fixedly connected with baffle on the fixing base, one side of baffle extends outside the backup pad.

In this scheme, when not utilizing the fixed shank of fixed part, the rotor plate rotates to the top surface of baffle on, and the baffle provides the support to the rotor plate, avoids the rotor plate to hang and rotates at will on the fixing base, and inconvenient getting when causing follow-up use fixed knot to take the rotor plate.

Furthermore, locking mechanical system includes locking lever and fixed block of fixed connection on the locking lever, and it has the screw hole with locking lever screw-thread fit to open on the fixing base, and it has the second spout along the fixing base slip direction to open in the backup pad, and the bottom of locking lever passes second spout and the bottom surface that the fixed block is located the backup pad.

In this scheme, when needs are fixed in the fixing base in the backup pad, only need rotate the locking lever and make the fixed block on the locking lever support tightly with the bottom surface of backup pad, utilize fastening force between the screw hole on locking lever and the fixing base and be fixed in the backup pad with the fixing base on, convenient operation.

Furthermore, the first arc-shaped groove and the second arc-shaped groove are fixedly connected with elastic air bags.

In this scheme, more preferably, equal fixed connection elastic airbag on first arc wall and second arc wall, when utilizing first arc wall and second arc wall to the shank fixed, the patient shank is located elastic airbag, elastic airbag can with patient shank in close contact with and promote patient's travelling comfort.

Drawings

Fig. 1 is a top view of a leg fixing structure for radiotherapy according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along a-a in fig. 1.

Fig. 3 is a schematic connection diagram of the fixing base, the rotating plate and the fixing mechanism according to an embodiment of the invention.

Fig. 4 is a cross-sectional view taken along the same line a-a as fig. 1 according to a second embodiment of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the safety valve comprises a supporting plate 1, a second sliding groove 2, a fixed seat 3, a locking rod 4, a fixed block 5, a first arc-shaped groove 6, a rotating plate 7, a fixed part 8, a second arc-shaped groove 9, an arc-shaped plate 10, an inserted rod 11, a fixed hole 12, a connecting groove 13, a baffle plate 14, an elastic air bag 15, a driven piston cylinder 16, a driven piston rod 17, a first sliding groove 18, a connecting plate 19, a driving piston cylinder 20, a driving piston rod 21, a connecting rod 22 and a safety valve 23.

Example one

An embodiment substantially as shown in figure 1: the utility model provides a shank fixed knot constructs for radiotherapy, backup pad 1 including the level is placed, it is shown to combine fig. 2, screw fixedly connected with landing leg is passed through to backup pad 1's bottom, the top surface of backup pad 1 is opened has along the fore-and-aft direction setting (be as in fig. 1 upper and lower direction) second spout 2, second spout 2 is the type of falling T, the top surface of backup pad 1 has fixing base 3 along fore-and-aft direction (be as in fig. 1 upper and lower direction) sliding connection, be equipped with on fixing base 3 and be used for being fixed in the locking mechanical system in backup pad 1 with fixing base 3. As shown in fig. 2, in this embodiment, locking mechanical system includes locking lever 4 and welds fixed block 5 in locking lever 4 bottom, and it has the screw hole of vertical setting to open on fixing base 3, and it has the external screw thread with screw hole screw-thread fit to open on the outer wall of locking lever 4, and fixed block 5 is located second spout 2.

As shown in fig. 2, all opened first arc wall 6 on the left side lateral wall of fixing base 3 and the right side lateral wall, left first arc wall 6 is towards the left side of backup pad 1, the first arc wall 6 on right side is towards the right side of backup pad 1, and simultaneously, the left side and the right side of fixing base 3 all are connected with rotor plate 7 through hinge rotation, because rotor plate 7 of fixing base 3 both sides sets up the mode homogeneous phase, only describe rotor plate 7 on fixing base 3 right side below, 3 left rotor plates 7 of fixing base and other structures set up along 3 symmetries of fixing base, no longer give unnecessary details here.

As shown in fig. 2, the top surface of the rotating plate 7 is hinged with a fixing part 8, the top surface of the fixing part 8 is provided with a second arc-shaped groove 9, when the rotating plate 7 is rotated, the second arc-shaped groove 9 and the first arc-shaped groove 6 can form a fixing gap for fixing the leg of the patient, which is shown by a dotted line.

As shown in fig. 3, a fixing mechanism for fixing the rotating plate 7 is arranged between the rotating plate 7 and the fixing seat 3, in this embodiment, the fixing mechanism includes an arc plate 10 and an insertion rod 11, the arc plate 10 is fixedly connected to the front side of the fixing seat 3 through a screw, a plurality of fixing holes 12 are formed in the arc plate 10, the fixing holes 12 are uniformly distributed along an arc using a rotating connection point of the rotating plate 7 and the fixing seat 3 as a circle center, and a connection groove 13 is formed between adjacent fixing holes 12, so that the adjacent fixing holes 12 are communicated with each other, and the width of the connection groove 13 is smaller than the diameter of the fixing hole 12. Inserted bar 11 includes big footpath section and path section, smooth transition between big footpath section and the path section, the diameter of big footpath section equals the diameter of fixed orifices 12, and the diameter of path section is less than the width of spread groove 13, it has the jack to open on the front side lateral wall of rotor plate 7, the one end of big footpath section is inserted in the jack, and be equipped with elasticity piece that resets between big footpath section and the jack bottom, in this embodiment, elasticity resets the spring including bonding between big footpath section and jack bottom, when the spring is in natural state, big footpath section is arranged in fixed orifices 12 and path section protrusion outside fixed orifices 12.

As shown in fig. 2, in order to keep the rotating plate 7 on the horizontal plane when the patient leg is not fixed by using the fixing structure, the rotating plate 7 and the bottom surface of the fixing base 3 are conveniently located on the same plane, a baffle plate 14 is fixedly connected to the bottom surface of the fixing base 3 through a screw, and one side of the baffle plate 14 extends to the lower side of the rotating plate 7 and can provide support for the rotating plate 7. Simultaneously, all bond elasticity gasbag 15 on first arc wall 6 and the second arc wall 9, utilize elasticity gasbag 15 and patient's shank contact, promote patient's comfort level.

The specific implementation mode is as follows:

when needs carry out the radiotherapy to patient's shank, at first patient lies on the top surface of backup pad 1, then lifts patient's shank, promotes fixing base 3 and slides along the top surface of backup pad 1 for patient's shank is located first arc wall 6 and reserves the position of patient's shank radiotherapy, avoids fixing base 3 to produce to the radiotherapy position and shelters from. Then the locking rod 4 is rotated to move the locking rod 4 relative to the supporting plate 1 to the upper side in the figure 2 until the top surface of the fixing block 5 is abutted against the top wall of the second sliding groove 2, so that the fixing seat 3 is fixed on the supporting plate 1.

Then, the inserting rod 11 is manually pressed, so that the large-diameter section of the inserting rod 11 exits from the fixing hole 12, and at the moment, the small-diameter section is located in the fixing hole 12 and can slide along the connecting groove 13; then, the rotating plate 7 is rotated by manually rotating the rotating plate 7, and the small-diameter section slides through the connecting groove 13 and moves into the other fixing hole 12. When the rotating plate 7 rotates, the rotating plate 7 drives the fixing part 8 to be close to the fixing seat 3, and the second arc-shaped groove 9 on the fixing part 8 faces the first arc-shaped groove 6, along with the continuous rotation of the rotating plate 7, the gap between the second arc-shaped groove 9 and the first arc-shaped groove 6 is gradually reduced, meanwhile, the second arc-shaped groove 9 is gradually contacted with the leg of the patient, at the moment, the fixing part 8 can automatically rotate according to the size of the leg until the leg is fixed by the second arc-shaped groove 9 and the first arc-shaped groove 6, and the outer wall of the fixing part 8 far away from the second arc-shaped groove 9 is abutted against the top surface of the rotating plate 7, so that the second arc-shaped groove 9 is prevented from rotating (corresponding to the dotted line in fig. 2); and finally, releasing the extrusion on the insertion rod 11, resetting the insertion rod 11 under the restoring force of the spring, and inserting the large-diameter section into the nearest fixing hole 12 nearby, so that the rotating plate 7 is fixed, the leg of the patient is stably fixed, and the radiotherapy treatment can be stably finished.

Example two

The difference between the second embodiment and the first embodiment is that: as shown in fig. 4, the rotating plate 7 is fixedly connected with a driven piston cylinder 16 through a screw, the driven piston cylinder 16 is connected with a driven piston plate in a sliding manner, the driven piston plate is fixedly connected with a driven piston rod 17 through a screw, and the fixing part 8 is hinged to the end part of the driven piston rod 17; a first vertically through chute 18 is formed in the supporting plate 1, the bottom of the fixed seat 3 is fixedly connected with an L-shaped connecting plate 19 through a screw, a vertical section of the connecting plate 19 downwards passes through the first chute 18, a horizontal straight section of the connecting plate 19 extends to the lower part of the rotating plate 7, the top surface of the horizontal straight section is fixedly connected with a transversely arranged driving piston cylinder 20 through a screw, a driving piston plate is transversely and slidably connected in the driving piston cylinder 20, a driving piston rod 21 is fixedly connected on the driving piston plate through a screw, a connecting rod 22 is hinged between the driving piston rod 21 and the bottom surface of the rotating plate 7, and an air pipe is communicated between the driving piston cylinder 20 and the driven piston cylinder 16; the active piston cylinder 20 is communicated with an air inlet pipe and an air outlet pipe, the air inlet pipe is provided with a one-way valve and communicated with an air charging device (not shown in the figure), when the air in the active piston cylinder 20 is too little, the air can be supplemented into the active piston cylinder 20 through the air inlet pipe, and the air outlet pipe is provided with a safety valve 23.

In the embodiment, the driving piston rod 21 and the driven piston cylinder 16 are arranged, and the driving piston cylinder 20 is communicated with the driven piston cylinder 16 by using an air pipe, so that the air pressure in the driving piston cylinder 20 is equal to that in the driven piston cylinder 16; when manual rotation rotor plate 7, rotor plate 7 drives driven piston cylinder 16 and still rotates pulling connecting rod 22 when rotating, thereby connecting rod 22 pulling driving piston rod 21 slides, make in the driving piston cylinder 20 compressed, thereby make the pressure increase in driving piston cylinder 20 and the driven piston cylinder 16, the driven piston plate receives pressure increase and promotes driven piston rod 17 and slides outside driven piston cylinder 16, supplementary fixed part 8 is close to fixing base 3 fast and accomplishes the fixed to patient's shank fast, promote fixed efficiency.

Meanwhile, since the fixing holes 12 in fig. 3 are arranged at intervals rather than continuously in the first embodiment, when the leg is fixed by the fixing portion 8, the small-diameter end of the insertion rod 11 may be located in the connecting groove 13, at this time, the large-diameter section must be moved to the nearest fixing hole 12 in the vicinity, and the rotation plate 7 must be rotated by a small amplitude, which may cause the leg to be fixed by a slightly large or small force, which may cause discomfort to the patient. In this embodiment, due to the arrangement of the driving piston cylinder 20 and the driven piston cylinder 16, even if the small diameter end is located in the connecting groove 13 when the leg of the patient needs to be fixed with proper force, the gas in the driving piston cylinder 20 and the driven piston cylinder 16 can be squeezed, when the air pressure in the driving piston cylinder 20 and the driven piston cylinder 16 is too large, the air is exhausted from the safety valve 23 on the exhaust pipe, so that the pressure in the extrusion driving piston cylinder 20 and the extrusion driven piston cylinder 16 is proper (specifically, the type of the safety valve 23 can adopt an A46Y spring full-open type safety valve), the pressure of the fixing part 8 to the leg part is proper, and the small diameter section can be aligned with the nearest fixing hole 12, the leg of the patient is fixed, and the gas in the driving piston cylinder 20 and the driven piston cylinder 16 has good buffer effect, so that the leg of the patient can be well and comfortably fixed; meanwhile, as the gas in the driving piston cylinder 20 and the driven piston cylinder 16 can be compressed, the buffer effect is certain, the problem that the legs of the patient are crushed due to the fact that the second arc-shaped groove 9 on the fixing part 8 applies excessive pressure to the legs of the patient at one time can be avoided, and the legs of the patient are protected.

The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The utility model provides a shank fixed knot constructs for radiotherapy, includes the backup pad and connects the fixing base in the backup pad, its characterized in that: the leg fixing device comprises a fixed seat, a fixed plate, a first arc-shaped groove, a second arc-shaped groove, a rotating plate, a second arc-shaped groove, a fixing mechanism and a fixing mechanism, wherein the first arc-shaped groove is formed in two sides of the fixed seat; the rotating plate is fixedly connected with a driven piston cylinder, a driven piston plate is connected in the driven piston cylinder in a sliding mode, a driven piston rod is fixedly connected to the driven piston plate, and the rotating plate is hinged to the driven piston rod; the support plate is fixedly connected with an active piston cylinder, an active piston plate is connected in the active piston cylinder in a sliding mode, an active piston rod is fixedly connected to the active piston plate, and a connecting rod is hinged between the active piston rod and the rotating plate; the intercommunication has the trachea between initiative piston cylinder and the driven piston cylinder, when rotating the rotor plate and drive the fixed part and fix patient's shank, the rotor plate will make the interior atmospheric pressure of initiative piston cylinder increase through the connecting rod, and gas in the initiative piston cylinder is impressed in the driven piston cylinder through the trachea for driven piston plate in the driven piston cylinder slides to being close to patient's shank direction, thereby makes the fixed part be close to patient's shank fast.

2. The leg fixing structure for radiation therapy as set forth in claim 1, wherein: the fixing seat is connected with the supporting plate in a sliding mode, and the fixing seat is provided with a locking mechanism.

3. The leg fixing structure for radiation therapy as set forth in claim 2, wherein: the fixing mechanism comprises an arc plate and an inserting rod, the arc plate is fixedly connected to the end portion of the fixing seat, the inserting rod is connected to the rotating plate, fixing holes capable of being inserted into the inserting rod are formed in the arc plate, and the number of the fixing holes is a plurality of and the fixing holes are arranged in an arc shape.

4. The leg fixing structure for radiation therapy as set forth in claim 3, wherein: the inserted bar is connected to the rotating plate in a sliding manner, and an elastic reset piece is arranged between the inserted bar and the rotating plate; the inserted bar includes path section and major diameter section, and it has the spread groove to open between the adjacent fixed orifices, the width of spread groove is greater than path section diameter and is less than the diameter of major diameter section, when elasticity resets and is in natural state, the major diameter section is arranged in the fixed orifices.

5. The leg fixing structure for radiation therapy as set forth in claim 4, wherein: the large-diameter section and the small-diameter section are in smooth transition.

6. The leg fixing structure for radiation therapy as set forth in claim 5, wherein: the driving piston cylinder is fixedly connected to the horizontal section of the connecting plate.

7. The leg fixing structure for radiation therapy as set forth in claim 6, wherein: the fixing seat is fixedly connected with a baffle, and one side of the baffle extends out of the supporting plate.

8. The leg fixing structure for radiation therapy as set forth in claim 7, wherein: locking mechanical system includes locking lever and fixed block of fixed connection on the locking lever, it has the screw hole with locking lever screw-thread fit to open on the fixing base, it has the second spout along the fixing base slip direction to open in the backup pad, the bottom of locking lever passes second spout and the bottom surface that the fixed block is located the backup pad.

9. A leg fixing structure for radiation therapy as set forth in any one of claims 1-8, wherein: and the first arc-shaped groove and the second arc-shaped groove are fixedly connected with elastic air bags.