Device for fixing body position during limb tumor radiotherapy

Abstract

The invention discloses a body position fixing device for limb tumor radiotherapy. The body position fixing device comprises a mattress; a square groove is formed in the mattress, and a plurality of limiting units are arranged in the square groove in an array mode and connected with the unit cushions and the fixing units. A plurality of transverse screw rods and vertical screw rods are respectively arranged on two adjacent sides of the mattress in an array manner; the limiting unit comprises a mounting block and a sliding block; a transverse groove is formed in the upper part of the mounting block, a vertical groove is formed in the lower part of the mounting block, and sliding blocks are arranged in the transverse groove and the vertical groove; the transverse screw rod and the vertical screw rod respectively penetrate through the transverse groove and the vertical groove; each unit pad is of a hollow square structure, a cross-shaped groove is formed in the lower portion of each unit pad, and blocking pieces are symmetrically arranged on the front side wall, the rear side wall, the left side wall and the right side wall of each unit pad in a staggered mode. The sliding block is controlled to move by rotating the transverse screw rod and the vertical screw rod, and locking and movement of the unit pad at the cross position of the transverse screw rod and the vertical screw rod are controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary instruments for tumor treatment, and in particular to a device for fixing body position during radiotherapy of limb tumors. Background Art

[0002] Limb tumors refer to tumors that originate in the limbs of the human body (including upper and lower limbs), including: lipoma, hemangioma, leiomyoma, fibroma, osteosarcoma, malignant lymphoma, soft tissue sarcoma, synovial sarcoma; or metastatic tumors from other parts of the body that invade the limbs, such as lung cancer, breast cancer, prostate cancer and other tumors that metastasize to the bones and soft tissues of the limbs. The symptoms of limb tumors vary depending on the type, location and size of the tumor. Generally speaking, benign tumors grow slowly, with mild or no obvious symptoms; malignant tumors grow rapidly, with obvious and severe symptoms. Common symptoms include: local lumps, pain, joint swelling, and pathological fractures. Radiotherapy is one of the important methods for treating malignant tumors in the limbs. It uses radiation to kill or inhibit the growth and spread of tumor cells. It is suitable for preventing recurrence after surgery or treating tumors that cannot be surgically removed.

[0003] In radiotherapy for primary limb tumors and limb metastases, due to the large mobility of the limbs, the limb positioning has poor repeatability and obvious displacement during CBCT scanning during treatment. The positioning error will seriously affect the position of the limb radiotherapy target area and the dose distribution of the surrounding normal tissues, which has an important impact on the accuracy of radiotherapy and the protection of normal tissues. The current body position fixation devices include thermoplastic body membranes, vacuum pads, foam glue, breast brackets, etc., which lack effectiveness and accuracy for the position fixation of limb malignant tumors during radiotherapy. Summary of the invention

[0004] In order to solve the drawbacks of the prior art, the present invention designs a device for fixing body position during radiotherapy of limb tumors, comprising: a mattress;

[0005] A square groove is provided on the mattress, and a plurality of limit units are arranged in an array in the square groove to connect the unit pads and the fixing units; a plurality of horizontal screws and vertical screws are arranged in an array on adjacent sides of the mattress;

[0006] The limiting unit includes a mounting block and a slider; a transverse groove is formed on the upper part of the mounting block, a vertical groove is formed on the lower part, and sliders are arranged in the transverse groove and the vertical groove;

[0007] The transverse screw and the vertical screw pass through the transverse slot and the vertical slot respectively;

[0008] The unit pad is a hollow square structure, a cross slot is provided at the bottom of the unit pad, and blocking pieces are symmetrically arranged on the front and rear side walls and the left and right side walls of the unit pad; the movement of the slider is controlled by rotating the horizontal screw and the vertical screw, and the locking and movement of the unit pad at the intersection of the horizontal screw and the vertical screw are controlled;

[0009] Furthermore, a strap is provided in the middle of the mattress; and fixing units are symmetrically provided on both the front and rear sides of the mattress;

[0010] Furthermore, the transverse groove and the vertical groove are both symmetrically provided with two sliding blocks;

[0011] The horizontal screw and the vertical screw are both composed of a plurality of screws with opposite thread rotation directions;

[0012] Furthermore, each of the transverse groove and the vertical groove is provided with a single sliding block;

[0013] The transverse screw and the vertical screw are both unidirectional screws;

[0014] Further, the fixing unit includes a unit pad, an electric push rod, and an arc plate; the unit pad has the same structure as the unit pad, and the electric push rod is arranged on the upper part of the unit pad; the arc plate is arranged on the output shaft of the electric push rod; and a scale is arranged on the output of the electric push rod;

[0015] The left and right sides of the arc plate are symmetrically provided with a slide groove crescent plate; the rear end of the arc plate located at the rear of the mattress is detachably connected to the ankle limit mechanism, and an air pump is arranged on the outer wall of one side of the arc plate; an air bag is arranged at the upper end of the crescent plate; a catheter is arranged on the air bag to connect to the air pump;

[0016] Furthermore, the rear part of the arc-shaped plate on the fixing unit at the rear part of the mattress is connected to the ankle limiting mechanism; the rear end of the arc-shaped plate at the front part of the mattress is detachably connected to the hand limiting mechanism;

[0017] The ankle limiting mechanism comprises a straight plate and a shaped frame; a connecting rod is provided at the lower end of the straight plate to detachably connect the curved plate, a foot pad is provided at the lower part of the straight plate, a slide groove is provided at the upper part of the straight plate to install the shaped frame, and a screw is provided on one side of the straight plate to connect the shaped frame; a scale is provided on the straight plate to observe and record the inward rotation and outward abduction angles of the sole of the foot; the screw is rotatably connected to the shaped frame, the toes are sleeved through the shaped frame, and the switching between the inward rotation and outward abduction of the toes is controlled by rotating the screw;

[0018] Furthermore, the hand limiting mechanism includes a mounting frame and a telescopic rod; the mounting frame is a U-shaped frame, the front end of the mounting frame is detachably connected to the arc plate, and the left and right sides of the mounting frame are symmetrically provided with adjusting screws; the two ends of the telescopic rod are respectively hinged to the lower ends of the adjusting screws on both sides;

[0019] Scales are set on both sides of the installation frame to observe and record the lifting distance of the adjusting screw; by synchronously rotating the adjusting screw, the palm holding the telescopic rod is driven to be raised or drooped; by rotating the adjusting screw on one side, the telescopic rod is tilted to control the inward and outward rotation of the palm.

[0020] The beneficial effects of the present invention are:

[0021] The present invention aims at the shortcomings of the device for fixing the body position during radiotherapy of limb tumors in the prior art, and discloses a device for fixing the body position during radiotherapy of limb tumors, comprising: a mattress, a unit pad, a fixing unit, a transverse screw, a vertical screw, and an ankle limiting mechanism; the patient lies flat on the mattress, uses a strap to tie the patient's waist, rotates the vertical screw and the transverse screw, releases the lock of the unit pad below the ankle, arm and other positions to be fixed, takes out the unit pad, inserts it into the fixing unit, rotates the vertical screw and the transverse screw, and locks the fixing unit; the patient's position to be fixed is placed inside the arc plate of the fixing unit, the air pump is started to inflate and squeeze the airbag to fix the leg or hand, the arc plate is lifted by the electric push rod, the height of the patient's leg and hand is adjusted so that the patient can receive radiotherapy ray irradiation treatment, and the scale on the electric push rod is observed to record the lifting height of the patient's hand and foot; the rotated transverse screw, the vertical screw, and the extension distance of the electric push rod are recorded, so that the limb positioning can be repeated according to the recording results in the subsequent treatment process to ensure the repeatability of the device;

[0022] An ankle limiting mechanism is also provided, where the toes are sleeved by a U-shaped frame, and the U-shaped frame is pushed to slide in the slide groove by rotating the screw rod, so as to control the switching between toe internal rotation and external abduction, and the distance of the screw rod movement is observed and recorded according to the scale on the straight board, so that the ankle swing position can be repeated according to the recorded results in the subsequent treatment process;

[0023] In the present invention, by recording the extended distance of the rotating horizontal screw, vertical screw, and electric push rod, and observing and recording the distance of the screw movement according to the scale on the straight plate, the above records can ensure the repeatability of the limb position during the patient's limb tumor radiotherapy, and solve the problem in the prior art that the limbs have a large mobility and the limbs have poor repeatability. The positioning error will seriously affect the position of the limb radiotherapy target area and the dose distribution of the surrounding normal tissues, which has an important impact on the accuracy of radiotherapy and the protection of normal tissues.

[0024] Furthermore, the fixing unit and the ankle limiting mechanism can realize quick fixation of the limbs, thus ensuring the efficiency of radiotherapy treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for describing the embodiment are briefly introduced below.

[0026] Figure 1 It is a schematic diagram of the overall structure of a device for fixing the body position during radiotherapy of limb tumors;

[0027] Figure 2 The present invention is a partial cross-sectional view of a mattress of a device for fixing the body position during radiotherapy of limb tumors;

[0028] Figure 3It is a schematic diagram of the local cross-section mechanism of a device for fixing the body position during radiotherapy of limb tumors;

[0029] Figure 4 It is a device for fixing the body position during radiotherapy of limb tumors Figure 3 Schematic diagram of the enlarged local structure;

[0030] Figure 5 Schematic diagram of the structure of the unit pad of a device for fixing the body position during radiotherapy of limb tumors;

[0031] Figure 6 Schematic diagram of the structure of the fixing unit of a device for fixing the body position during radiotherapy of limb tumors;

[0032] Figure 7 Schematic diagram of the connection structure between the fixing unit and the ankle limiting mechanism of a device for fixing the body position during radiotherapy of limb tumors;

[0033] Figure 8 Schematic diagram of the connection structure between the fixing unit and the hand limiting mechanism of a device for fixing the body position during radiotherapy of limb tumors.

[0034] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0035] 1 - Mattress, 101 - Square groove, 102 - Belt, 103 - Limiting unit, 1031 - Mounting block, 10311 - Horizontal groove, 10312 - Vertical groove, 1032 - Slide block, 2 - Unit pad, 201 - Cross groove, 202 - Flap, 301 - Horizontal screw, 302 - Vertical screw, 4 - Fixing unit, 401 - Electric push rod, 402 - Arc plate, 4021 - Inflation pump, 4022 - Crescent plate, 40221 - Airbag, 5 - Ankle limiting mechanism, 501 - Straight plate, 5011 - Foot pad, 5012 - Connecting rod, 5013 - Slide groove, 5014 - Screw, 502 - C-shaped frame, 6 - Hand limiting mechanism, 601 - Mounting frame, 602 - Adjusting screw, 603 - Telescopic rod. Detailed implementation method

[0036] In order to solve the problems existing in the prior art devices for fixing the body position during radiotherapy of limb tumors, the present invention discloses a device for fixing the body position during radiotherapy of limb tumors, including: Mattress 1;

[0037] A square groove 101 is opened on the mattress 1, and a number of limiting units 103 are arranged in an array in the square groove 101 to connect the unit pad 2 and the fixing unit 4; A number of horizontal screws 301 and vertical screws 302 are respectively arranged in an array on two adjacent sides of the mattress 1;

[0038] The limiting unit 103 includes a mounting block 1031 and a slider 1032; the mounting block 1031 has a transverse groove 10311 on the upper part and a vertical groove 10312 on the lower part, and the slider 1032 is arranged in the transverse groove 10311 and the vertical groove 10312;

[0039] The transverse screw rod 301 and the vertical screw rod 302 pass through the transverse slot 10311 and the vertical slot 10312 respectively;

[0040] The unit pad 2 is a hollow square structure, with a cross groove 201 at the bottom of the unit pad 2, and blocking pieces 202 are symmetrically arranged on the front and rear side walls and the left and right side walls of the unit pad 2; the movement of the slider 1032 is controlled by rotating the horizontal screw 301 and the vertical screw 302, thereby controlling the locking and movement of the unit pad 2 at the intersection of the horizontal screw 301 and the vertical screw 302.

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Example 1

[0043] like Figure 3 It is a schematic diagram of a partial cross-sectional structure of the present invention. In the present invention, a mattress 1 is provided;

[0044] The mattress 1 is provided with a square groove 101, and a plurality of limiting units 103 are arranged in an array in the square groove 101 to connect the unit pad 2 and the fixing unit 4; a plurality of horizontal screws 301 and vertical screws 302 are arranged in an array on adjacent sides of the mattress 1;

[0045] The limiting unit 103 includes a mounting block 1031 and a slider 1032; the mounting block 1031 has a transverse groove 10311 on the upper part and a vertical groove 10312 on the lower part, and the slider 1032 is arranged in the transverse groove 10311 and the vertical groove 10312;

[0046] The transverse screw rod 301 and the vertical screw rod 302 pass through the transverse slot 10311 and the vertical slot 10312 respectively;

[0047] The unit pad 2 is a hollow square structure, a cross slot 201 is provided at the bottom of the unit pad 2, and baffles 202 are symmetrically arranged on the front and rear side walls and the left and right side walls of the unit pad 2; the movement of the slider 1032 is controlled by rotating the horizontal screw 301 and the vertical screw 302, and the locking and movement of the unit pad 2 at the intersection of the horizontal screw 301 and the vertical screw 302 are controlled;

[0048] In this embodiment, the transverse groove 10311 and the vertical groove 10312 are symmetrical to the two sliding blocks 1032;

[0049] The transverse screw 301 and the vertical screw 302 are both composed of a plurality of screws 5014 with opposite thread rotation directions. By rotating the transverse screw 301 or the vertical screw 302, the sliders 1032 symmetrically arranged inside the transverse groove 10311 and the vertical groove 10312 are controlled to move closer or farther synchronously, so as to realize the contact and separation between the slider 1032 and the baffle 202, and control the locking and loosening of the unit pad 2 by the slider 1032. Only when the sliders 1032 in the transverse groove 10311 and the vertical groove 10312 are separated from the baffle 202, the unit pad 2 can be taken out, otherwise any contact between the slider 1032 and the baffle 202 will limit the unit pad 2. Therefore, in this embodiment, the key to ensuring the repeatability of the treatment process of the patient's limb tumor is to record the transverse screw 301 and the vertical screw 302 rotated when installing the fixing unit 4;

[0050] As a preferred embodiment of this embodiment, the transverse groove 10311 and the vertical groove 10312 are both provided with a single slider 1032;

[0051] The transverse screw 301 and the vertical screw 302 are both one-way screws 5014. By rotating the transverse screw 301 or the vertical screw 302, the contact and separation of the slider 1032 inside the transverse groove 10311 and the vertical groove 10312 and the baffle 202 are controlled to achieve the locking and release of the unit pad 2 by the slider 1032. Although this preferred embodiment can also be used as a backup plan, when the slider 1032 locks the unit pad 2, the slider 1032 only contacts with the baffle 202 on one side, and the locked unit pad 2 will have a slight shake.

[0052] Example 2

[0053] like Figure 6 The figure shows a schematic diagram of the structure of the fixing unit 4 of the present invention. In the present invention, a fixing unit 4 is provided, and the fixing unit 4 includes a unit pad 2-, an electric push rod 401, and an arc plate 402; the unit pad 2- has the same structure as the unit pad 2, and the electric push rod 401 is provided on the upper part of the unit pad 2; the arc plate 402 is provided on the output shaft of the electric push rod 401; and a scale is provided on the output of the electric push rod 401;

[0054] The curved plate 402 has symmetrically arranged slide grooves 5013 and crescent plates 4022 on the left and right sides, the rear end of the curved plate 402 is detachably connected to the ankle limiting mechanism 5, and an air pump 4021 is arranged on the outer wall of one side of the curved plate 402; an air bag 40221 is arranged on the upper end of the crescent plate 4022; a catheter is arranged on the air bag 40221 to connect with the air pump 4021, and the patient's leg or hand is received through the curved plate 402, and the air pump 4021 is controlled to inflate air into the air bag 40221, so that the air bag 40221 expands and presses the patient's limbs, thereby fixing the limbs;

[0055] And in this embodiment, the electric push rod 401 is controlled to extend to lift the patient's limb for radiotherapy, and a scale is set on the output of the electric push rod 401. The extended distance of the electric push rod 401 can be recorded by the electric push rod 401, so as to repeat the limb placement position according to the scale in the subsequent process.

[0056] Embodiment 3

[0057] As Figure 7 As shown in the figure is a schematic connection structure diagram of the fixing unit 4 and the ankle limiting mechanism 5 of the present invention; in this embodiment, the ankle limiting mechanism 5 is provided to include a straight plate 501 and a U-shaped frame 502; a connecting rod 5012 is detachably connected to the arc plate 402 at the lower end of the straight plate 501, a foot pad is provided at the lower part of the straight plate 501, a chute 5013 is opened at the upper part of the straight plate 501 to install the U-shaped frame 502, and a screw rod 5014 is provided on one side of the straight plate 501 to connect the U-shaped frame 502; a scale is provided on the straight plate 501 to observe and record the internal rotation and abduction angles of the sole of the foot; the screw rod 5014 is rotatably connected to the U-shaped frame 502, the U-shaped frame 502 is sleeved on the toe tip, and the internal rotation and abduction of the toe tip are controlled by rotating the screw rod 5014;

[0058] In this embodiment, the U-shaped frame 502 is sleeved on the toe tip, and the U-shaped frame 502 is pushed to slide in the chute 5013 by rotating the screw rod 5014 to control the switching between the internal rotation and abduction of the toe tip, and the moving distance of the screw rod 5014 is observed and recorded according to the scale on the straight plate 501, so that the ankle swing position can be repeated according to the recorded result in the subsequent treatment process;

[0059] As Figure 8 As shown in the figure, in the present invention, a hand limiting mechanism is provided;

[0060] In this embodiment, the hand limiting mechanism 6 includes a mounting frame 601 and a telescopic rod 603; the mounting frame 601 is a U-shaped frame, the front end of the mounting frame 601 is detachably connected to an arc plate, and adjusting screw rods 602 are symmetrically arranged on the left and right sides of the mounting frame 601; both ends of the telescopic rod 603 are respectively hinged to the lower ends of the adjusting screw rods 602 on both sides;

[0061] Scales are provided on both sides of the mounting frame 601 to observe and record the lifting and lowering distance of the adjusting screw rod 602; by synchronously rotating the adjusting screw rod, the palm holding the telescopic rod is driven to tilt up or down; by rotating the adjusting screw rod on one side, the telescopic rod is driven to tilt, and the internal rotation and external rotation of the palm are controlled;

[0062] In this embodiment, by providing a hand limiting mechanism and an ankle limiting mechanism, the internal rotation and external rotation of the human hand and ankle are controlled, and records are facilitated in both the hand limiting mechanism and the ankle limiting mechanism to ensure the repeatability of the patient's body position in the subsequent treatment process.

[0063] Example 4

[0064] In this embodiment, a device for fixing the body position during radiotherapy of limb tumors is disclosed. Its clinical treatment environment is special. During radiotherapy, there are a large number of rays. As is well known, metal will interfere with ray irradiation, affect the efficacy of radiation, and interfere with the radiotherapy effect;

[0065] Therefore, in this embodiment, components such as the mattress 1, unit pad 2, arc plate 402, crescent plate 4022, unit pad 2 one, connecting rod 5012, straight plate 501, foot pad, C-shaped frame 502, screw 5014, transverse screw 301, vertical screw 302, and mounting block 1031 are all made of non-metallic rigid plastic supports to avoid affecting radiotherapy rays;

[0066] In this embodiment, in order to reduce the influence of the air pump 4021 and electric push rod 401 that must contain metal on radiotherapy rays, except for the circuit, the parts of the air pump 4021 that need to use metal are made of alumina with a lower density;

[0067] The output shaft of the electric push rod 401 is made of resin polymer material, and the other parts that need to use metal are made of alumina with a lower density;

[0068] In this embodiment, the limb fixation contact parts are all made of rigid plastic that does not allow rays to penetrate, and components containing technology, such as the air pump 4021 and electric push rod 401, are arranged below the arc plate 402 to minimize the interference of metal on rays as much as possible.

[0069] In summary, the present invention is designed to address the deficiencies of the prior art devices for fixing the body position during radiotherapy of limb tumors, and discloses a device for fixing the body position during radiotherapy of limb tumors, including: a device for fixing the body position during radiotherapy of limb tumors, including: a mattress 1, a unit pad 2, a fixing unit 4, a horizontal screw 301, a vertical screw 302, and an ankle limiting mechanism 5; the patient lies flat on the mattress 1, uses the strap 102 to tie the patient's waist, rotates the vertical screw 302 and the horizontal screw 301, releases the lock of the unit pad 2 under the ankle, arm, etc. that needs to be fixed, takes out the unit pad 2, inserts the fixing unit 4, and rotates the vertical screw 302 and the horizontal screw 301 to release the lock of the unit pad 2 under the ankle, arm, etc. that needs to be fixed, takes out the unit pad 2, inserts the fixing unit 4, and rotates the vertical screw 302 and the horizontal screw 301 to release the lock of the unit pad 2 under the ankle, arm, etc. that needs to be fixed, 302 and the transverse screw 301, lock the fixing unit 4; place the patient to be fixed inside the arc plate 402 of the fixing unit 4, start the air pump 4021 to inflate and squeeze the airbag 40221 to fix the legs or hands, lift the arc plate 402 through the electric push rod 401, adjust the height of the patient's legs and hands, so that they can receive radiotherapy radiation treatment, observe the scale on the electric push rod 401 to record the lifting height of the patient's hands and feet; record the rotating transverse screw 301, vertical screw 302, and the extension distance of the electric push rod 401, so that the subsequent treatment process can repeat the limb positioning according to the recorded results to ensure the repeatability of the device;

[0070] An ankle limiting mechanism 5 is provided, which sleeves the toes through the U-shaped frame 502, and pushes the U-shaped frame 502 to slide in the slide groove 5013 by rotating the screw 5014, so as to control the switching between the toes' internal rotation and external abduction, and observes and records the movement distance of the screw 5014 according to the scale on the straight plate 501, so that the ankle swing position can be repeated according to the recorded results in the subsequent treatment process;

[0071] In the present invention, by recording the extended distances of the rotating horizontal screw 301, the vertical screw 302, and the electric push rod 401, and observing and recording the movement distance of the screw 5014 according to the scale on the straight plate 501, the above records can ensure the repeatability of the limb position during the patient's limb tumor radiotherapy, and solve the problem in the prior art that the limbs have a large mobility and the limbs have poor repeatability. The positioning error will seriously affect the position of the limb radiotherapy target area and the dose distribution of the surrounding normal tissues, which has an important impact on the accuracy of radiotherapy and the protection of normal tissues.

[0072] question;

[0073] Furthermore, the fixing unit 4 and the ankle limiting mechanism 5 can realize rapid fixation of the limbs, thereby ensuring the efficiency of radiotherapy treatment.

[0074] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described.

Claims

1. A device for fixing body position during radiotherapy of limb tumors, characterized in that: include: Mattress; A square groove is provided on the mattress, and a plurality of limit units are arranged in an array in the square groove to connect the unit pads and the fixing units; a plurality of horizontal screws and vertical screws are arranged in an array on adjacent sides of the mattress; The limiting unit includes a mounting block and a slider; a transverse groove is formed on the upper part of the mounting block, a vertical groove is formed on the lower part, and sliders are arranged in the transverse groove and the vertical groove; The transverse screw and the vertical screw pass through the transverse slot and the vertical slot respectively; The unit pad is a hollow square structure, a cross slot is provided at the bottom of the unit pad, and blocking pieces are symmetrically arranged on the front and rear side walls and the left and right side walls of the unit pad; the movement of the slider is controlled by rotating the horizontal screw and the vertical screw, and the locking and movement of the unit pad at the intersection of the horizontal screw and the vertical screw are controlled.

2. The device for fixing body position during radiotherapy of limb tumors according to claim 1, characterized in that: A strap is arranged in the middle of the mattress; and fixing units are symmetrically arranged on both the front and rear sides of the mattress.

3. The device for fixing body position during radiotherapy of limb tumors according to claim 1, characterized in that: The transverse groove and the vertical groove are both symmetrically provided with two sliding blocks; The transverse screw and the vertical screw are both composed of a plurality of screws with opposite thread rotation directions.

4. The device for fixing body position during radiotherapy of limb tumors according to claim 1, characterized in that: The transverse groove and the vertical groove are both provided with a single sliding block; The transverse screw and the vertical screw are both unidirectional screws.

5. The device for fixing body position during radiotherapy of limb tumors according to claim 1, characterized in that: The fixing unit comprises a unit pad 1, an electric push rod, and an arc plate; the unit pad 1 has the same structure as the unit pad, and an electric push rod is arranged on the upper part of the unit pad; an arc plate is arranged on the output shaft of the electric push rod; and a scale is arranged on the output of the electric push rod; The curved plate has symmetrically arranged sliding grooves and crescent plates on the left and right sides, the rear end of the curved plate is detachably connected to the ankle limiting mechanism, and an air pump is arranged on the outer wall of one side of the curved plate; an air bag is arranged on the upper end of the crescent plate; and a catheter is arranged on the air bag to connect to the air pump.

6. The device for fixing body position during radiotherapy of limb tumors according to claim 5, characterized in that: The rear part of the arc-shaped plate on the fixing unit at the rear part of the mattress is connected to the ankle limiting mechanism; The ankle limiting mechanism includes a straight plate and a curved frame; a connecting rod is provided at the lower end of the straight plate to detachably connect the curved plate, a foot pad is provided at the lower part of the straight plate, a sliding groove is provided at the upper part of the straight plate to install the curved frame, and a screw is provided on one side of the straight plate to connect the curved frame; a scale is provided on the straight plate to observe and record the internal rotation and abduction angles of the sole of the foot; the screw is rotatably connected to the curved frame, the toes are sleeved through the curved frame, and the switching between the internal rotation and abduction of the toes is controlled by rotating the screw.

7. The device for fixing body position during radiotherapy of limb tumors according to claim 5, characterized in that: The hand limiting mechanism comprises a mounting frame and a telescopic rod; the mounting frame is a U-shaped frame, the front end of the mounting frame is detachably connected to the arc plate, and the left and right sides of the mounting frame are symmetrically provided with adjusting screws; the two ends of the telescopic rod are respectively hinged to the lower ends of the adjusting screws on both sides; Scales are set on both sides of the installation frame to observe and record the lifting distance of the adjusting screw; by synchronously rotating the adjusting screw, the palm holding the telescopic rod is driven to be raised or drooped; by rotating the adjusting screw on one side, the telescopic rod is tilted to control the inward and outward rotation of the palm.

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