CN114714608B - A automatic preforming device of thermoplastic film for being directed at head radiotherapy - Google Patents

Abstract

The invention discloses an automatic thermoplastic film preforming device for head radiotherapy, which belongs to the field of body position fixing of clinical radiotherapy patients, and comprises a press-fitting module for fixing a thermoplastic film, a shaping module for stretching the thermoplastic film upwards and a secondary stretching module for stretching the thermoplastic film downwards, wherein the press-fitting module is positioned at the periphery of the shaping module, and the secondary stretching module is positioned above the shaping module; the shaping module comprises a plurality of main stretching rollers which can be lifted and rotated, and the interval between two adjacent main stretching rollers can be adjusted; the secondary stretching module comprises a plurality of auxiliary stretching rollers which can be lifted and rotated, and the auxiliary stretching rollers are sequentially arranged along the edge of the thermoplastic film. The invention can effectively solve the problem of uneven stretching of the thermoplastic film, thereby ensuring that the mesh holes on the thermoplastic film are consistent in later retraction, avoiding the uneven stretching condition, ensuring that the individuation degree, the repeatability and the reliability of the position fixing of the patient are higher, and having better treatment effect and good comfort level.

Description

A automatic preforming device of thermoplastic film for being directed at head radiotherapy

Technical Field

The invention belongs to the field of body position fixation of clinical radiotherapy patients, and particularly relates to an automatic thermoplastic film preforming device for head radiotherapy.

Background

Radiation therapy, one of the three main therapeutic approaches for tumors, has recently entered into the age of precise personalized radiotherapy with the increasing development of radiobiology, radiophysics, computer technology, etc. In the treatment process, radiotherapy position fixing is one of key links for ensuring that accurate radiotherapy technology can be implemented, patients in the later period of affairs receive the repeatability and the accuracy of radiotherapy every day, and patients need to combine with thermoplastic films of corresponding irradiation parts through position fixing devices every time of radiotherapy, so that accurate and individual position fixing is carried out, and the repeatability and the treatment accuracy of the radiotherapy position of the patients are powerfully ensured.

The existing thermoplastic films for radiotherapy body position fixation all adopt a low-temperature thermoplastic memory film made of high polymer materials, the film thickness of the low-temperature thermoplastic memory film is about 2-3 mm, the film is distributed in a mesh shape, and the high-energy X-ray transmittance is required to be high (more than or equal to 99.9%). Thermoplastic films with various shapes can be selected according to different clinical irradiation part requirements, and can be widely applied to the clinical radiotherapy process; meanwhile, the low-temperature thermoplastic memory film can be fully softened at 65 ℃ generally, after being soaked in 65 ℃ water for 3-5 min for softening, two radiotherapy technicians cooperate with manual stretching of the thermoplastic film to enable meshes of the thermoplastic film to be deformed uniformly as much as possible, and then the thermoplastic film is covered on the body surface of a patient and pressed out of the bony position of the body in time for individual shaping. The thermoplastic film is generally fished out from hot water, then stretched, covered on the body surface of a patient, and pressed to plasticity, the whole process time is controlled to be 15-20 s, after that, the patient needs to keep the current position of the body for about 15-20 min, and after the temperature of the thermoplastic film is reduced, the thermoplastic film is cooled and hardened to be formed, so that the radiotherapy position of the patient is fixed, and the repeatability and the accuracy of the radiotherapy position of the patient each time are further ensured.

At present, the U-shaped thermoplastic film is widely applied to the head tumor radiotherapy process and is matched with a radiotherapy body position fixing device to fix the focus position of a patient, so that the repeatability and the accuracy of each treatment are ensured. However, when the thermoplastic film is softened, a radiotherapy technician manually pulls up the thermoplastic film, because the frame around the head and neck positioning film is made of hard plastic, the U-shaped thermoplastic film cannot be directly stretched from two sides during stretching, the traditional mode only can depend on experience of the radiotherapy technician, according to actual position conditions of a patient, the palm is used for firstly pulling away and stretching a part of the thermoplastic film, then the thermoplastic film is covered on the head of the patient, and the thermoplastic film is contacted with the body surface, and the hard frame around the thermoplastic film is forcedly pressed again for secondary stretching, so that final position fixing of the patient is completed; however, this way can not effectively carry out rapid, accurate and uniform overall stretching on the thermoplastic film, so that the difference of mesh cooling retraction in the later stage is larger, if the partial mesh stretching of the thermoplastic film is too large, the thermoplastic film can not retract even after cooling, and the thermoplastic film can not play a role in fixing the body position, especially when the hard frame around the thermoplastic film is forced to be stretched for the second time, the stretching quality and the body position fixing effect of the thermoplastic film can be affected due to the physical conditions (such as body surface injury, postoperative incision, fistulization opening, fracture, oblique head and shoulder), internal tension and the like of a patient. Even experienced radiotherapeutic technicians cannot ensure uniformity of mesh stretching, and more so, only the local thermoplastic film meshes of the patient can be made to reach a relatively uniform degree. Meanwhile, after the thermoplastic film is softened by hot water, the retraction degree of the thermoplastic film is the largest in the first 10-15 min of the cooling process, the retraction is relatively small, the whole retraction process generally lasts for 24 hours, if the thermoplastic film is unevenly stretched by a radiotherapy technician in the body position fixing process, the later mesh retraction is inconsistent, so that the gap between the thermoplastic film and the local tightening, chin, shoulder, nose and the like is large, the movement is easy, the fixing effect is poor, in addition, the radiation position of the radiotherapy is offset, the fixing comfort is not high, the fixing effect and repeatability are poor, the later radiotherapy is arranged, the treatment precision is reduced and the like.

In addition, because the time for the radiotherapy technician to finish the stretching process of the thermoplastic film is shorter, the radiotherapy technician can only consider more critical facial thermoplastic film parts when stretching the thermoplastic film by manually stretching the thermoplastic film, so that most thermoplastic films on the shoulders on two sides of a patient cannot be uniformly stretched, and the thermoplastic film has large gap after stretching and retracting and has poorer fixing effect on the shoulders with larger mobility; meanwhile, as the radiotherapy technician does not have redundant time for some special patients, for example, patients with deep vein implantation tube, fistulization opening, autogenous cutting, drainage tube, mouth plug and the like on the body surface part, if the patients are not opened on the thermoplastic film in time, the patients can only be opened by manually tearing the local thermoplastic film, the molding quality of the thermoplastic film is greatly affected, and the patients have poor medical examination, comfort, fixation and treatment effects, especially for the elderly patients.

At present, in order to solve the problems of uneven stretching, poor fixing effect, poor comfort and the like of thermoplastic films, the thermoplastic films are improved in the prior art, for example, a head fixing film and a head fixing device are disclosed in patent application with the application number of 201921914487.9, the head fixing film comprises a frame and a low-temperature thermoplastic film, the frame is at least two and jointly encloses into a fixing area, and the low-temperature thermoplastic film covers the fixing area and is connected with each frame. Through the improvement, the size of the low-temperature thermoplastic film in the fixing area can be adjusted through adjusting the size of the fixing area, so that the stretching multiple of the low-temperature thermoplastic film can be reduced through increasing the size of the low-temperature thermoplastic film in the fixing area, the low-temperature thermoplastic film is prevented from being reduced in strength due to excessive stretching, and the fixing effect is good. However, the stretching mode of the head fixing membrane is not changed when the head fixing membrane is used, so that the problem of local overstretching of the low-temperature thermoplastic membrane is not fundamentally solved, and the problems of local tightening, big gaps between the chin, the shoulder, the nose and the like and the thermoplastic membrane, easy movement, poor fixing effect and the like cannot be solved.

The patent application with the application number of 201721302737.4 discloses a radiotherapy locating film, which comprises a locating film and fixed strakes, wherein the locating film is a low-temperature thermoplastic plate film, and an elliptical hole is formed in the locating film. Through improving the shape of the holes on the positioning film, the uniformity of the positioning film is improved to a certain extent, and the uneven thickness of the positioning film is effectively reduced. Because the stretching mode of the positioning film is not changed when the positioning film is used, the problem of local overstretching of the low-temperature thermoplastic film is not fundamentally solved, and the problems of local tightness, big gaps between the chin, the shoulder, the nose and the like and the thermoplastic film, easy movement, poor fixing effect and the like cannot be solved.

A radiotherapy positioning body membrane is disclosed in the patent application with the application number of 201620514912.5, and is used for covering a body part and distributing a membrane body with meshes, wherein the membrane body comprises an abdomen membrane area covering the abdomen and an abdomen outer membrane area covering the outside of the abdomen; the abdomen diaphragm area is made of a resin bandage, or the resin bandage and the low-temperature thermoplastic plate are alternately made in a strip shape; the external abdominal membrane area is made of a low-temperature thermoplastic plate. The deformation of fixing is reduced through the zonal control of the membrane elasticity, so that the whole stretching is more uniform, the fixing effect is improved, but the structure of the membrane is improved in the patent application document, the problem of local overstretching of the low-temperature thermoplastic film is not fundamentally solved, and the problems of local tightness, chin, shoulders, nose and the like, large gaps between the thermoplastic film, easiness in movement, poor fixing effect and the like cannot be solved.

Therefore, in order to fundamentally solve the problems of uneven stretching, poor fixing effect, poor comfort, partial tightening, chin, shoulder and nose, large gaps between the thermoplastic films, and the like by changing the stretching mode, there is an urgent need for an automatic thermoplastic film preforming device for radiotherapy of the head, which can uniformly pre-stretch the thermoplastic films.

Disclosure of Invention

The invention aims to provide an automatic thermoplastic film preforming device for head radiotherapy, which can effectively solve the problem of uneven stretching of a thermoplastic film, avoid the situation of uneven stretching, ensure that the retraction of meshes on the thermoplastic film at the later stage is consistent, ensure that the body position of a patient is fixed, and have higher individuation degree, repeatability and reliability and good comfort, further ensure that the body surface ossification mark is more accurate, improve the treatment effect and reduce the treatment cost.

In order to achieve the aim of the invention, the technical scheme adopted is as follows: the automatic thermoplastic film preforming device for head radiotherapy comprises a press-fit module for fixing a thermoplastic film, a shaping module for stretching the thermoplastic film upwards and a secondary stretching module for stretching the thermoplastic film downwards, wherein the press-fit module is positioned at the periphery of the shaping module, and the secondary stretching module is positioned above the shaping module; the shaping module comprises a plurality of main stretching rollers which can be lifted and rotated, the distance between two adjacent main stretching rollers is adjustable, the plurality of main stretching rollers are divided into two groups, the two groups of main stretching rollers respectively correspond to the head top and the face of a patient, the main stretching rollers corresponding to the head top of the patient transversely extend, the main stretching rollers corresponding to the face of the patient longitudinally extend, and the lengths of the transverse extension and the longitudinal extension of the main stretching rollers are different according to the head size of the patient; the secondary stretching module comprises a plurality of auxiliary stretching rollers which can be lifted and rotated, the auxiliary stretching rollers are sequentially distributed along the edge of the thermoplastic film, and protrusions are uniformly distributed on the roller surfaces of the main stretching rollers and the auxiliary stretching rollers.

Further, the device further comprises a base, the shaping module and the secondary stretching module are detachably arranged on the base, and the press-fit module is movable on the base.

Further, the shaping module and the secondary stretching module comprise a plurality of liftable supporting structures arranged on the base, and a plurality of main stretching rollers and a plurality of auxiliary stretching rollers are arranged on the supporting structures one by one.

Further, the supporting structure comprises a supporting component arranged on the base and a mounting frame arranged on the supporting component, the mounting frame can swing left and right on the supporting component, and the main stretching roller or the auxiliary stretching roller is rotatably arranged on the mounting frame.

Further, the mounting frame is U-shaped, and both ends of the mounting frame are provided with relatively extending inserting shafts, and both ends of the main stretching roller or both ends of the auxiliary stretching roller are respectively inserted on the two inserting shafts in a rotating mode.

Further, the supporting component comprises at least one supporting rod, the clamping jaw I is further installed at the upper end of the supporting rod, and the horizontal section of the installation frame is clamped on the clamping jaw I.

Furthermore, the inner wall of the clamping jaw I is provided with tooth grooves which are uniformly distributed at intervals, and the horizontal section of the mounting frame is provided with racks matched with the tooth grooves.

Further, the supporting rod in the shaping module is an automatic telescopic rod.

Further, the bracing piece in the secondary stretching module is the U type, and the one end of this bracing piece is inserted and is established at the base lateral wall, and clamping jaw I installs the other end at this bracing piece, and the perpendicular section of this bracing piece is automatic telescopic link.

Furthermore, the upper surface of base and the side equipartition of base have the cartridge hole, and the lower extreme demountable installation of bracing piece is in the cartridge hole.

Further, the press-fitting module comprises a plurality of mounting seats which can be close to or far from the shaping module, and the plurality of mounting seats are distributed at intervals along the circumferential direction of the thermoplastic film; install on the mount pad with thermoplastic film frame complex clamping jaw II, and clamping jaw II can reciprocate on the mount pad.

Further, a guide rail extending to the shaping module is further arranged on the base, and a sliding block in sliding fit with the guide rail is arranged on the mounting seat; and the base is also provided with a linear driving mechanism for driving the mounting seat to slide along the guide rail.

Further, the linear driving mechanism comprises a screw rod rotatably supported on the base, a nut matched with the screw rod is further installed on the installation seat, and a driving motor for driving the screw rod to rotate is further installed in the sliding groove.

Further, the mounting seat is further provided with an upward extending telescopic cylinder, and the clamping jaw II is arranged at the output end of the telescopic cylinder.

Further, the plurality of main stretching rollers in the shaping module are in an arch shape, and the arch degree of the plurality of main stretching rollers is gradually reduced from the middle part of the thermoplastic film to the edge of the thermoplastic film.

The beneficial effects of the invention are as follows:

through the common cooperation of design module, pressure equipment module and secondary stretching module, and the position of reasonable design module, pressure equipment module and secondary stretching module in the thermoplastic membrane, and inject the different functions of design module, pressure equipment module and secondary stretching module, the centre gripping of thermoplastic membrane is passed through the pressure equipment module and is driven its up-and-down motion, and the design module then can simulate out patient's body surface form roughly, make the pressure equipment module when centre gripping and the downward movement to the thermoplastic mould, the design module carries out the jacking to the thermoplastic membrane, then, upward movement through the pressure equipment module, make the thermoplastic membrane upward movement, make the pressure equipment module lose the tensile to the thermoplastic membrane, at this moment, the secondary stretching module stops the upward movement of thermoplastic membrane, make the secondary stretching module carry out the redrawing to the portion that the thermoplastic membrane was not stretched by the design module, after the tensile back, the pressure equipment module downward movement, with the thermoplastic membrane that accomplishes stretching takes off from the pressure equipment module can, cooperation between the pressure equipment module and the secondary stretching module, make the thermoplastic membrane laminate with patient's head after the heat, the shape of bringing down more, the therapeutic effect of being convenient for, the radiotherapy can also improve the use rate, the therapeutic effect.

According to the invention, the stretching of the thermoplastic film is more uniform through the matching of the shaping module and the secondary stretching module, and the stretched thermoplastic film does not need to be stretched again manually by a technician, so that the stretched thermoplastic film can be directly covered on the body surface of a patient, and the meshes on the thermoplastic film are uniformly retracted, so that the retraction of the meshes on the thermoplastic film is kept consistent, the fixing effect is good, the patient is more comfortable, the individuation degree, the repeatability and the reliability of the body position fixing of the patient are higher, the body surface bone marks are more accurate, and the treatment effect is enhanced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

The invention provides a top view schematic diagram of an automatic thermoplastic film preforming device for radiotherapy of a head;

a front view schematic diagram of the shaping module;

a side view schematic diagram of the shaping module;

an enlarged partial view of part a in fig. 3;

a structural schematic diagram of the mounting frame;

a top view schematic of the secondary stretching module;

a schematic side view of the secondary stretching module;

An enlarged partial view of part B in fig. 7;

a structural schematic diagram of the press-fit module;

a top view schematic of the base;

a structural schematic diagram of the main stretching roller and the auxiliary stretching roller;

a structural schematic diagram of the perforating tool;

the thermoplastic film is schematically shown.

The reference numerals and corresponding part names in the drawings:

1. the device comprises a base, a press-fit module, a shaping module, a secondary stretching module, a punching cutter and a punching module, wherein the base is provided with the press-fit module, the shaping module, the secondary stretching module and the punching cutter;

101. a plug-in hole;

201. the device comprises a mounting seat, a telescopic cylinder, a 203, clamping jaws II, 204, a guide rail, 205, a sliding block, 206, a screw, 207, nuts, 208 and a driving motor;

301. the main stretching roller 302, the supporting component 303, the mounting frame 304, the plugging shaft 305 and the plugging part;

3011. a protrusion;

3021. the support rod 3022, the clamping jaws i, 3023 and the tooth socket;

3031. a rack;

401. a secondary stretching roller;

501. mounting plate, 502, lower platen, 503, cutting blade, 504, quick insert.

Detailed Description

The present invention will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the substances, and not restrictive of the invention. It should be further noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1, the automatic thermoplastic film preforming device for head radiotherapy provided by the invention comprises a press-fitting module 2, a shaping module 3 and a secondary stretching module 4, wherein the press-fitting module 2 is mainly used for clamping a thermoplastic film (shown in fig. 13) and driving the thermoplastic film to move up and down, the shaping module 3 is used for approximately simulating the shape of the body surface of a patient, so that the thermoplastic film is stretched when being pressed on the shaping module 3 by driving of the shaping module 3, and the secondary stretching module 4 is used for compensating a position, which is not uniformly stretched by the shaping module 3, of the thermoplastic film after primary stretching is pressed on the secondary stretching module 4 by driving of the shaping module 3. When the thermoplastic film forming device is arranged, the press-fit module 2 is arranged on the periphery of the shaping module 3, so that after the thermoplastic film is clamped by the press-fit module 2, the thermoplastic film is more uniformly pressed downwards in the process of downwards pressing the thermoplastic film by the press-fit module 2; meanwhile, the secondary stretching module 4 is arranged above the shaping module 3, so that the space is not occupied, and the secondary stretching of the thermoplastic film can be realized.

The shaping module 3 includes a plurality of main stretching rollers 301, the axial direction of the main stretching rollers 301 is consistent with the horizontal direction, the plurality of main stretching rollers 301 are arranged at intervals along the width or/and length direction of the thermoplastic film, and the extending direction of the plurality of main stretching rollers 301 may be according to the actual practice, for example, when the thermoplastic film is used for fixing the head of a patient, since the height of the head of the patient and the heights of the two sides of the head of the patient become gradually lower after the patient lies flat, in order to simulate different heights of the head of the patient, the main stretching rollers 301 corresponding to the head of the patient may extend along the width direction of the thermoplastic film, and the main stretching rollers 301 corresponding to the face and the two sides of the head of the patient may extend along the length direction of the human body. The distance between two adjacent main stretching rollers 301 is adjustable, and the plurality of main stretching rollers 301 can be lifted, so that the height of the main stretching rollers 301 and the distance between the two adjacent main stretching rollers 301 can be adjusted according to the body surface shape of a patient before the positioning module is used, and the shape formed by the plurality of main stretching rollers 301 is basically consistent with the shape of the patient; meanwhile, the plurality of main stretching rollers 301 can rotate, so that when the thermoplastic film acts on the molding module 3, each main stretching roller 301 can rotate under the action of the thermoplastic film, and the main stretching rollers 301 can drive the thermoplastic film to stretch synchronously when rotating, so that the stretching of the thermoplastic film is more uniform.

The plurality of main stretching rollers 301 in the shaping module 3 are divided into two groups, the two groups of main stretching rollers 301 respectively correspond to the top of the head and the face of the patient, and the length direction of the thermoplastic film is consistent with the height direction of the patient because the height of the top of the head and the neck of the patient are greatly changed, so that the first group of main stretching rollers 301 can extend along the width direction of the thermoplastic film, the second group of main stretching rollers 301 can extend along the length direction of the thermoplastic film, namely, the extending direction between the two adjacent groups of main stretching rollers 301 is vertical, and when the thermoplastic film is stretched by the shaping module 3 and then covered on the patient, the head of the patient is fixed. In the actual setting process, the number of sets of the main stretching rollers 301 and the arrangement of the sets of the main stretching rollers 301 may be adjusted according to the position covered by the thermoplastic film. Specifically, in determining the extending direction of the main stretching roller 301, reference may be made to the shape of the patient, for example, taking the top of the head of the patient as an example, when the patient lies flat, the height gradually decreases from the face to the top of the head, and the human body is located at the same height in the lateral direction from both sides of the top of the head, at which time the main stretching roller 301 may extend in the width direction of the thermoplastic film; taking the patient's face as an example, when the patient lies down, the height gradually decreases from the left and right sides of the face, and the change in height from chin to forehead is small, and at this time, the main stretching roller 301 may extend along the length direction of the thermoplastic film. Thus, the thermoplastic film is fixed to different parts of the patient, and the extending directions of the main stretching rollers 301 are not consistent, and the specific extending directions of the main stretching rollers 301 are designed according to the covering positions of the thermoplastic film.

The secondary stretching module 4 comprises a plurality of auxiliary stretching rollers 401, the plurality of auxiliary stretching rollers 401 are horizontally arranged, and the plurality of auxiliary stretching rollers 401 can also lift and rotate. In the stretching process of the thermoplastic film, when the thermoplastic film contacts the shaping module 3, along with the downward pressing of the thermoplastic film, the tensile force applied to the thermoplastic film is mainly concentrated at the shaping module 3 and around the shaping module 3, so that the part of the thermoplastic film pressed on the shaping module 3 and the part around the shaping module 3 start to deform, and the part close to the frame of the thermoplastic film is limited in the tensile force, so that the meshes cannot be pulled out, and in order to deform the frame around the thermoplastic film, the axial directions of the plurality of auxiliary stretching rollers 401 are sequentially distributed along the edge of the thermoplastic film, the frame around the thermoplastic film acts on the auxiliary stretching rollers 401 when the thermoplastic film moves upwards after the thermoplastic film is matched with the shaping module 3, and the auxiliary stretching rollers 401 stretch the frame around the thermoplastic film along with the continuous upward movement of the thermoplastic film, so that the whole thermoplastic film is stretched for the second time.

The stretching of the thermoplastic film is more uniform through the cooperation of the shaping module 3 and the secondary stretching module 4, and the meshes on the thermoplastic film are uniformly retracted after the thermoplastic film is covered on the surface of a patient, so that the meshes on the thermoplastic film are uniformly retracted.

In some embodiments, the thermoplastic film automatic preforming device for radiotherapy of the head further comprises a base 1, wherein the shape of the base 1 can be adjusted according to actual use requirements; simultaneously, design module 3 and secondary stretch module 4 are all installed on base 1, and design module 3 and secondary stretch module 4 are detachable installation in base 1, make a plurality of main stretch rollers 301 in design module 3 and secondary stretch roller 401 in secondary stretch module 4 when the installation, can adjust its mounted position and installation quantity according to patient's form, and pressure equipment module 2 can remove on base 1, through the removal of pressure equipment module 2 on base 1, make pressure equipment module 2 be close to or keep away from design module 3. Because the secondary stretching module 4 is arranged on the base 1, and the secondary stretching module 4 is positioned above the shaping module 3, in order to avoid the installation of the secondary stretching module 4 and the shaping module 3, the lower end of the secondary stretching module 4 can only be arranged on the periphery of the shaping module 3 when the secondary stretching module 4 is arranged; meanwhile, in order to facilitate the feeding of the thermoplastic film to be stretched between the shaping module 3 and the secondary stretching module 4, one side of the base 1 must be opened, but in order to facilitate the thermoplastic film to be subjected to more uniform pressure during the downward movement, the press-fitting module 2 needs to be arranged along the periphery of the frame of the thermoplastic film, so that the installation requirement of the press-fitting module 2, the installation requirement of the secondary stretching module 4 and the placement requirement of the thermoplastic film are combined, and the secondary stretching rollers 401 and the press-fitting module 2 in the secondary stretching module 4 are arranged along the periphery of the frame of the thermoplastic film during the installation of the secondary stretching module 4.

In some embodiments, as shown in fig. 2 to 8, the shaping module 3 and the secondary stretching module 4 each include a plurality of support structures mounted on the base 1, the plurality of support structures are all lifted, and the plurality of support structures are respectively used for supporting the plurality of primary stretching rollers 301 and the plurality of secondary stretching rollers 401, that is, when the support structures are mounted, the lower ends of the support structures are detachably mounted on the base 1, and the primary stretching rollers 301 or the secondary stretching rollers 401 are rotatably mounted on the upper ends of the support structures. The lifting of the supporting structure enables the plurality of main stretching rollers 301 and the plurality of auxiliary stretching rollers 401 to lift, so that the heights of the plurality of main stretching rollers 301 and the plurality of auxiliary stretching rollers 401 are adjusted, the mounting heights of the different main stretching rollers 301 and the auxiliary stretching rollers 401 are adjusted according to different forms of patients, the forms of the patients are simulated, and the forms of the thermoplastic film after stretching are basically consistent with the forms of the patients, so that the application range is wider.

In some embodiments, the support structure includes a support assembly 302 and a mounting bracket 303, where the support assembly 302 is detachably mounted on the base 1 and extends vertically upward on the base 1, and the mounting bracket 303 is mounted on the support assembly 302, and the main stretching roller 301 or the auxiliary stretching roller 401 is rotatably mounted on the mounting bracket 303, and the length direction of the mounting bracket 303 extends along the horizontal direction, after the mounting bracket 303 is mounted on the support assembly 302, the mounting bracket 303 swings on the support assembly 302 with the extending direction of the mounting bracket 303 as an axis, and the mounting bracket 303 swings while driving the main stretching roller 301 or the auxiliary stretching roller 401 to synchronously displace, so that the distance between two adjacent main stretching rollers 301 and the distance between the main stretching roller 301 and the auxiliary stretching roller 401 change, and as the distance between two adjacent main stretching rollers 301 and the distance between the main stretching roller 301 and the auxiliary stretching roller 401 change, the height of the main stretching roller 301 or the auxiliary stretching roller 401 can be compensated by adjusting the height of the support assembly 302 in order to ensure that the height of the main stretching roller 301 or the auxiliary stretching roller 401 can compensate the main stretching roller 401. Because the distance between the two adjacent main stretching rollers 301 and the distance between the main stretching roller 301 and the auxiliary stretching roller 401 are adjusted, when the shape of the shaping module 3 is adjusted according to the shape of a patient or the shape of the patient is required to be adjusted under the condition that the shape change of the patient is small, the size and the shape of the positioning module can be adjusted by adjusting the distance between the two main stretching rollers 301 or the distance between the main stretching roller 301 and the auxiliary stretching roller 401, and the adjustment of the main stretching roller 301 and the auxiliary stretching roller 401 is more convenient through the lifting of the supporting component 302 and the swinging of the mounting frame 303.

In some embodiments, the mounting frame 303 is U-shaped, the cross section of the mounting frame 303 is circular, the horizontal section of the mounting frame 303 is mounted on the supporting component 302, two ends of the mounting frame 303 are respectively provided with a plugging shaft 304, the two plugging shafts 304 horizontally extend towards the middle of the mounting frame 303, and the plugging shafts 304 and the mounting frame 303 are in an integral structure; the two ends of the main stretching roller 301 or the two ends of the auxiliary stretching roller 401 are respectively inserted on the two inserting shafts 304 in a rotating way, so that the main stretching roller 301 and the auxiliary stretching roller 401 can rotate more fully, and the structure of the mounting frame 303 is simpler; meanwhile, the mounting frame 303 and the inserting shaft 304 are rod-shaped, and one side of the mounting frame 303 is open, so that the mounting frame 303 has certain elasticity, when the main stretching roller 301 or the auxiliary stretching roller 401 is mounted, the mounting frame 303 can be directly pulled, two ends of the main stretching roller 301 or the auxiliary stretching roller 401 are respectively inserted into the two inserting shafts 304, after the main stretching roller 301 or the auxiliary stretching roller 401 is mounted, the acting force on the mounting frame 303 is lost, at the moment, the mounting frame 303 can be restored, and the mounting and the dismounting of the main stretching roller 301 and the auxiliary stretching roller 401 are more convenient.

In some embodiments, the support assembly 302 includes at least one support bar 3021, the support bar 3021 may be automatically lifted, and the number of support bars 3021 in the same support assembly 302 may be adjusted according to the length of the mounting frame 303, that is, when the main stretching roller 301 or the auxiliary stretching roller 401 is short, the mounting frame 303 is also short, and when the stretching roller or the auxiliary stretching roller 401 is long, the support bar 3021 in the support assembly 302 may be one, and when the stretching roller or the auxiliary stretching roller 401 is long, the mounting frame 303 is also long, and then the support bar 3021 in the support assembly 302 may be two or more. When the number of the support rods 3021 in the same support assembly 302 is multiple, the multiple support rods 3021 in the same support assembly 302 are arranged at intervals along the horizontal section direction of the mounting frame 303, so that the multiple support rods 3021 in the same support assembly 302 support the mounting frame 303 together, and the installation of the main stretching roller 301 and the auxiliary stretching roller 401 is more stable; meanwhile, the clamping jaw I3022 is further arranged at the upper end of the supporting rod 3021, the clamping jaw I3022 can be hinged to the clamping jaw I3022 formed by two arc-shaped clamping arms through torsion springs, of course, in order to improve automation of the clamping jaw I3022, the clamping jaw I3022 can also be an electric clamping jaw I3022 or a pneumatic clamping jaw I3022, when the clamping jaw I3022 adopts the electric clamping jaw I3022 or the pneumatic clamping jaw I3022, the extending end of the clamping arm of the electric clamping jaw I3022 or the pneumatic clamping jaw I3022 can be arranged in an arc shape, and when the installation frame 303 is installed, the clamping jaw I3022 clamps and fixes the horizontal section of the installation frame 303, installation and disassembly between the supporting rod 3021 and the installation frame 303 are more convenient, the clamping jaw I3022 can be directly opened when the installation frame 303 is required to be adjusted to swing, and then the clamping jaw I3022 is manually adjusted to be fixed from new clamping. Since the adjustment of the main stretching roller 301 and the auxiliary stretching roller 401 is required before the stretching of the thermoplastic film, and the positions of the main stretching roller 301 and the auxiliary stretching roller 401 are kept unchanged during the stretching process of the thermoplastic film, the structure does not influence the stretching of the thermoplastic film. Of course, the support assembly 302 may be replaced by a small mechanical arm while the swing of the mounting frame 303 is satisfied and the lifting of the support bar 3021 is satisfied.

In some embodiments, the inner wall of the clamping jaw i 3022 has tooth grooves 3023 arranged at regular intervals, the plurality of tooth grooves 3023 are arranged along the circumferential direction of the clamping jaw i 3022, the horizontal section of the mounting frame 303 has a rack 3031 matched with the tooth grooves 3023, and the clamping jaw i 3022 is more stable between the mounting frame 303 and the clamping jaw i 3022 after clamping the horizontal section of the mounting frame 303 through the matching of the rack 3031 and the tooth grooves 3023, so that when the thermoplastic film is effectively prevented from being pressed on the main stretching roller 301 or the auxiliary stretching roller 401, the main stretching roller 301 and the auxiliary stretching roller 401 are transmitted to the mounting frame 303 after being stressed, so that the mounting frame 303 is inclined, and the stability of the supporting structure is ensured; meanwhile, in order to conveniently know the swinging angle of the mounting frame 303, an angle line can be marked on the clamping jaw I3022, and a starting point scale is marked on the horizontal section of the mounting frame 303, when the mounting frame 303 swings, the swinging angle of the mounting frame 303 can be obtained according to the position of the starting point scale on the mounting frame 303 corresponding to the scale line on the clamping jaw I3022, so that the mounting frame 303 is more convenient to adjust.

In some embodiments, the support rod 3021 in the shaping module 3 is an automatic telescopic rod, which may be a small cylinder or a small electronic telescopic rod, so that the telescopic operation of the support rod 3021 is more convenient, and the height adjustment of the main stretching roller 301 or the auxiliary stretching roller 401 is more convenient.

In some embodiments, the support rod 3021 in the secondary stretching module 4 is U-shaped, one end of the support rod 3021 is inserted into the side wall of the base 1, the middle of the support rod 3021 is consistent with the height direction of the base 1, the other end of the support rod 3021 extends above the shaping module 3, the opening of the clamping jaw i 3022 in the secondary stretching module 4 faces the shaping module 3, and two ends of the mounting frame 303 extend toward the shaping module 3, at this time, in order to ensure the support of the support rod 3021, the vertical section of the support rod 3021 is an automatic telescopic rod, that is, the support rod 3021 in the extension module is formed by installing two horizontally extending connecting rods at two ends of a small cylinder or a small electronic telescopic rod, when in installation, one connecting rod is installed on the side surface of the base 1, and the other connecting rod is horizontally arranged above the shaping module 3, so that the space occupied by the secondary stretching module 4 when in installation is smaller. When the size of the base 1 is enough, the support rod 3021 in the secondary stretching module 4 may be directly configured in an L shape, and at this time, the support rod 3021 is formed by installing a horizontally extending connecting rod at the output end of the small cylinder or the small electronic telescopic rod, and when the support rod is installed, the lower end of the small cylinder or the small electronic telescopic rod is installed on the upper surface of the base 1, and the other connecting rod is horizontally arranged above the shaping module 3.

In some embodiments, as shown in fig. 10, the upper surface of the base 1 and the side surface of the base 1 are uniformly provided with the insertion holes 101, and the lower end of the support rod 3021 is provided with an insertion portion 305, and the lower end of the support rod 3021 is inserted into the insertion holes 101 through the insertion portion 305. Since the support bar 3021 in the setting module 3 is mounted on the upper surface of the base 1, the axial direction of the insertion portion 305 in the setting module 3 coincides with the axial direction of the support bar 3021; the support bar 3021 in the secondary stretching module 4 is mounted on the side wall of the base 1, the support bar 3021 in the secondary stretching module 4 is U-shaped, and the lower end of the support bar 3021 extends horizontally to the side wall of the base 1, so that the inserting portion 305 in the secondary stretching module 4 is located at the lower end of the support bar 3021 and extends horizontally along the lower end of the support bar 3021, and when the shape of the inserting hole 101 in the side wall of the base 1 is matched with the lower end of the support bar 3021, the lower end of the support bar 3021 in the secondary stretching module can be directly inserted into the inserting hole 101. Through the cooperation of the insertion hole 101 and the insertion portion 305, not only the installation of the support rod 3021 is more convenient, but also the support rod 3021 can be adjusted according to the installation position of the main stretching roller 301 or the auxiliary stretching roller 401 during the installation, so that the flexibility of the main stretching roller 301 and the auxiliary stretching roller 401 during the installation is higher.

In some embodiments, as shown in fig. 9, the press-fitting module 2 includes a plurality of mounting seats 201, where the plurality of mounting seats 201 are arranged at intervals along the frame of the thermoplastic film or symmetrically along the central axis of the thermoplastic film, but in order to ensure that the thermoplastic film is stressed more uniformly around during the downward movement, it is preferable to use a plurality of mounting seats 201 arranged at intervals along the frame of the thermoplastic film. The plurality of mounting seats 201 can be close to or far away from the shaping module 3 on the base 1, so that when the thermoplastic film is positioned above the shaping module 3, the plurality of mounting seats 201 are close to or far away from the thermoplastic film; meanwhile, the mounting seat 201 is further provided with the clamping jaw II 203, the clamping jaw II 203 can move up and down on the mounting seat 201, the clamping jaw II 203 can directly adopt a clamping jaw II 203 cylinder, when the mounting seats 201 are close to the positioning module, the thermoplastic film can be jointly placed on the clamping jaws II 203, the thermoplastic film is jointly clamped through the clamping jaws II 203, the thermoplastic film is fixed, and the clamping jaws II 203 are jointly moved upwards, so that the thermoplastic film moves up and down.

In some embodiments, the base 1 is further provided with a guide rail 204, the guide rail 204 extends towards the shaping module 3, the bottom of the mounting seat 201 is further provided with sliding blocks 205 slidably matched with the guide rail 204, and the number of the sliding blocks 205 can be twice that of the guide rail 204, so that the two sliding blocks 205 are slidably matched with the same guide rail 204, and the base 1 is more stable in the sliding process; meanwhile, a linear driving mechanism for driving the mounting seat 201 to slide along the guide rail 204 is further arranged on the base 1, and the mounting seat 201 is driven by the linear driving mechanism to realize reciprocating motion, so that the reciprocating motion of the mounting seat 201 is more convenient.

In some embodiments, the linear driving mechanism includes a screw 206 rotatably supported on the base 1, the axis direction of the screw 206 is consistent with the axis direction of the sliding rail, a nut 207 matched with the screw 206 is further installed on the bottom surface of the mounting seat 201, a driving motor 208 for driving the screw 206 to rotate is further installed on the base 1, the screw 206 is driven to rotate by the rotation of the driving motor 208, and the screw 206 performs linear motion on the screw 206 when in rotation by the cooperation of the screw 206 and the nut 207, so that the mounting seat 201 is driven. Here, the linear driving mechanism may also be replaced by a rack and pinion 3031 structure or directly by an air cylinder.

In some embodiments, the mounting seat 201 is further provided with an extending cylinder 202 extending upwards, the lower end of the extending cylinder 202 is fixedly installed on the mounting seat 201, and the clamping jaw ii 203 is fixedly installed at the output end of the extending cylinder 202, so that the up-and-down movement of the clamping jaw ii 203 is more convenient. Here, the telescopic cylinder 202 may also be replaced by a linear driving element such as an electronic telescopic rod, a hydraulic cylinder, etc.

The press-fitting module 2 can also adopt a two-dimensional mechanical arm capable of feeding along the Z direction and the Y direction, and when the two-dimensional mechanical arm is adopted, the clamping jaw II 203 can be directly arranged at the execution end of the two-dimensional mechanical arm; meanwhile, in the present invention, in order to rapidly read the heights of the main stretching roller 301 and the auxiliary stretching roller 401, scale mark lines may be engraved on the piston rod of the telescopic cylinder 202 or on the output shaft of the support rod.

In some embodiments, since the plurality of main stretching rollers 301 are mainly used to simulate the shape of the patient, but the head, the shoulder, etc. of the patient are basically in the shape of the middle high edge, so in order to make the shape commonly simulated by the plurality of main stretching rollers 301 more similar to the shape of the patient, when the plurality of main stretching rollers 301 in the shaping module 2 are used to simulate the shape of the human body together, the heights of the main stretching rollers 301 in the shaping module 2 are different, because the edges of the human body are lower, the upper surface formed by the plurality of main stretching rollers 301 together after the arrangement is arched, specifically, the height in the shaping module 2 can be gradually reduced from the middle of the thermoplastic film to the edge of the thermoplastic film, so that the shape commonly simulated by the plurality of main stretching rollers 301 is more similar to the shape of the patient, and the finally stretched thermoplastic film is more similar to the shape of the patient under the condition that the thermoplastic film is uniformly stretched, so that the thermoplastic film is not stretched again when the thermoplastic film covers the body surface of the patient, and the patient is more comfortable.

In some embodiments, the protrusions 3011 are uniformly distributed on the roller surfaces of the main stretching roller 301 and the auxiliary stretching roller 401, as shown in fig. 11, the protrusions 3011 are in a circular arc shape at the top, and the size of the protrusions 3011 is not larger than the mesh size of the thermoplastic film under the condition of no stretching, so that when the thermoplastic film is pressed on the main stretching roller 301 or the auxiliary stretching roller 401, the protrusions 3011 enter the meshes of the thermoplastic film, and when the thermoplastic film continuously moves downwards or upwards, the rotation of the main stretching roller 301 and the auxiliary stretching roller 401 is synchronous with the stretching of the thermoplastic film through the cooperation of the protrusions 3011 and the thermoplastic film, so that after the thermoplastic film is pressed on the main stretching roller 301 and the auxiliary stretching roller 401, the compressed parts of the thermoplastic film and the main stretching roller 301 and the auxiliary stretching roller 401 are continuously stretched through the rotation of the main stretching roller 301 and the auxiliary stretching roller 401, and the stretching of the thermoplastic film is more uniform.

When the thermoplastic film is required to be pre-stretched, the body surface morphology of the patient is measured, wherein the body surface morphology comprises the width and the height of the face, the width and the height of the chin, the width and the height of the neck, the width and the height of the shoulder and the like, the number, the arrangement mode and the installation height of the main stretching rollers 301 and the auxiliary stretching rollers 401 are determined according to the measured height, the spacing between the adjacent two main stretching rollers 301 and the horizontal spacing between the main stretching rollers 301 and the auxiliary stretching rollers 401 are driven, the position of the supporting rod 3021 is determined according to the arrangement of the main stretching rollers 301 and the auxiliary stretching rollers 401, after the determination, the inserting part 305 at the lower end of the supporting rod 3021 is inserted into the inserting hole 101 on the base 1, the inclination angle between the installation frame 303 and the supporting rod 3021 is determined according to the measured height, after the inclination angle is determined, the assembled main stretching rollers 301 or the assembled auxiliary stretching rollers 401 are clamped and fixed through the clamping jaws I3022 on the supporting rod 3021, and the common installation of the plurality of the main stretching rollers 301 and the auxiliary stretching modules 401 is completed.

The plurality of driving motors 208 rotate positively, the plurality of driving motors 208 respectively drive the screw rods 206 to rotate, the nuts 207 advance on the screw rods 206 while the screw rods 206 rotate, the nuts 207 advance synchronously while the mounting seats 201 advance through the cooperation of the sliding blocks 205 and the guide rails 204, the plurality of mounting seats 201 simultaneously approach to the positioning module, and when the mounting seats 201 move to a fixed position, the driving motors 208 stop rotating.

The thermoplastic film is placed into hot water for soaking, after the thermoplastic film is soaked, the thermoplastic film is inserted between the main stretching roller 301 and the auxiliary stretching roller 401, the frame of the thermoplastic film corresponds to the clamping jaws II 203, the clamping jaws II 203 are started at the same time, and the clamping jaws II 203 clamp the frame of the thermoplastic film together, so that the thermoplastic film is clamped and fixed.

Simultaneously, a plurality of telescopic cylinders 202 are started to enable the telescopic cylinders 202 to shrink together, the telescopic cylinders 202 drive the opposite clamping jaws II 203 to synchronously move downwards, the thermoplastic film clamped by the clamping jaws II 203 moves downwards, the middle part of the thermoplastic film is firstly pressed at the top of the main stretching roller 301 in the downward movement process of the thermoplastic film, the thermoplastic film continues to move downwards along with the continued shrinkage of the telescopic cylinders 202, the thermoplastic film is stretched in the downward movement process of the thermoplastic film, and the main stretching roller 301 synchronously rotates while the thermoplastic film is stretched, so that the middle part of the thermoplastic film is uniformly stretched.

The plurality of telescopic cylinders 202 stretch out simultaneously, the plurality of telescopic cylinders 202 drive the clamping jaws II 203 to synchronously move upwards, so that the thermoplastic film clamped by the clamping jaws II 203 is separated from the plurality of main stretching rollers 301 to move upwards, the edge of the thermoplastic film is pressed on the auxiliary stretching rollers 401 in the upward movement process of the thermoplastic film, the thermoplastic film continues to move upwards along with the continuous stretching of the telescopic cylinders 202, the thermoplastic film is stretched in the upward movement process of the thermoplastic film, and the auxiliary stretching rollers 401 synchronously rotate while stretching the thermoplastic film, so that the edge of the thermoplastic film is uniformly stretched.

After the thermoplastic film is stretched, the telescopic cylinders 202 synchronously reset, the telescopic cylinders 202 drive the clamping jaws II 203 to synchronously reset, the stretched thermoplastic film moves between the main stretching roller 301 and the auxiliary stretching roller 401, the clamping jaws II 203 jointly lose clamping of the thermoplastic film, a radiotherapy technician takes down the thermoplastic film, the driving motors 208 reversely rotate, the driving motors 208 respectively drive the screw 206 to rotate, the screw 206 rotates and the nuts 207 back on the screw 206, the nuts 207 synchronously back the mounting seats 201 through the cooperation of the sliding blocks 205 and the guide rails 204 when backing, the mounting seats 201 simultaneously reset, and the driving motors 208 stop rotating after the mounting seats 201 are reset.

Finally, the removed thermoplastic film is immediately covered on the patient's body and the frame of the thermoplastic film is secured to the couch.

In the invention, when stretching the thermoplastic film, the size of the shaping module 3 can be adjusted by adjusting the installation height and the installation interval of the main stretching roller 301 and the installation height and the horizontal interval between the auxiliary stretching roller 401 and the main stretching roller 301 aiming at patients with different sizes, so that the stretching degree of the pre-stretching of the thermoplastic film is changed. Meanwhile, the secondary stretching module 4 in the invention can also adjust the number of the auxiliary stretching rollers 401 and the interval between two adjacent auxiliary stretching rollers 401 according to the actual stretching condition in the setting process.

In the invention, when the thermoplastic film is secondarily stretched by the secondary stretching roller 401, as the supporting rod 302 in the secondary stretching module 4 is U-shaped or L-shaped and the mounting frame 303 has a certain height, the mounting frame 303 in the secondary stretching module 4 can be downwards extended after being mounted on the horizontal section of the supporting rod 302, so that the roller surface of the secondary stretching roller 401 is at a certain distance from the horizontal section of the upper end of the supporting rod 302, when the thermoplastic film moves upwards through the driving of the press-mounting module 2, the thermoplastic film corresponds to the secondary stretching roller 401, and the hard frame of the thermoplastic film is positioned between the secondary stretching roller 401 and the vertical section of the supporting rod 302, therefore, the upper end of the supporting rod 302 in the secondary stretching module 4 can not prevent the upward movement of the thermoplastic film when the press-mounting module 2 drives the thermoplastic film to move upwards.

In the thermoplastic film pre-stretching process, the automatic thermoplastic film pre-forming device for head radiotherapy can be further provided with a hole opening device, the hole opening device can be directly arranged on the base 1, the hole opening device can be formed by a manipulator (not shown in the figure) arranged on the base 1 and a hole opening cutter 5, the structure of the hole opening cutter 5 is shown in fig. 12, the automatic thermoplastic film pre-forming device comprises a mounting plate 501, a lower pressing plate 502 and a cutting blade 503 which are coaxially and radially arranged at intervals are arranged on the lower surface of the mounting plate 501, the lower pressing plate 502 is positioned on the inner side of the cutting blade 503, meanwhile, in order to facilitate the mounting and dismounting between the hole opening cutter 5 and the manipulator, a quick-inserting block 504 matched with the manipulator can be arranged on the mounting plate 501, and the quick-inserting block 504 can be directly adopted on a clamp used by the existing manipulator.

In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

It will be appreciated by persons skilled in the art that the above embodiments are provided for clarity of illustration only and are not intended to limit the scope of the invention. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present invention.

Claims (15)

1. The automatic thermoplastic film preforming device for head radiotherapy is characterized by comprising a press-fit module (2) for fixing a thermoplastic film, a shaping module (3) for stretching the thermoplastic film upwards and a secondary stretching module (4) for stretching the thermoplastic film downwards, wherein the press-fit module (2) is positioned at the periphery of the shaping module (3), and the secondary stretching module (4) is positioned above the shaping module (3); the shaping module (3) comprises a plurality of main stretching rollers (301) which can be lifted and rotated, the distance between two adjacent main stretching rollers (301) is adjustable, the plurality of main stretching rollers (301) are divided into two groups, the two groups of main stretching rollers (301) respectively correspond to the head top and the face of a patient, the main stretching rollers (301) corresponding to the head top of the patient transversely extend, the main stretching rollers (301) corresponding to the face of the patient longitudinally extend, and the lengths of the transverse extension and the longitudinal extension of the main stretching rollers (301) are different according to the head size of the patient; the secondary stretching module (4) comprises a plurality of auxiliary stretching rollers (401) which can be lifted and rotated, the auxiliary stretching rollers (401) are sequentially arranged along the edge of the thermoplastic film, and protrusions (3011) are uniformly distributed on the roller surface of the main stretching roller (301) and the roller surface of the auxiliary stretching roller (401).

2. The automatic thermoplastic film preforming device for head radiotherapy according to claim 1, further comprising a base (1), wherein the shaping module (3) and the secondary stretching module (4) are detachably mounted on the base (1), and wherein the press-fitting module (2) is movable on the base (1).

3. The automatic thermoplastic film preforming device for head radiotherapy according to claim 2, wherein the shaping module (3) and the secondary stretching module (4) comprise a plurality of liftable supporting structures arranged on the base (1), and a plurality of main stretching rollers (301) and a plurality of auxiliary stretching rollers (401) are arranged on the plurality of supporting structures one by one.

4. A thermoplastic film automatic preforming device for radiotherapy of head according to claim 3, characterized in that the supporting structure comprises a supporting component (302) mounted on the base (1) and a mounting frame (303) mounted on the supporting component (302), the mounting frame (303) is swingable left and right on the supporting component (302), and the main stretching roller (301) or the auxiliary stretching roller (401) is rotatably mounted on the mounting frame (303).

5. The automatic thermoplastic film preforming device for head radiotherapy according to claim 4, wherein the mounting frame (303) is in a U shape, two ends of the mounting frame (303) are provided with oppositely extending inserting shafts (304), and two ends of the main stretching roller (301) or two ends of the auxiliary stretching roller (401) are respectively rotatably inserted on the two inserting shafts (304).

6. The automatic thermoplastic film preforming device for head radiotherapy according to claim 4, characterized in that the supporting component (302) comprises at least one supporting rod (3021), and the upper end of the supporting rod (3021) is further provided with a clamping jaw i (3022), and the horizontal section of the mounting frame (303) is clamped on the clamping jaw i (3022).

7. The automatic thermoplastic film preforming device for head radiotherapy according to claim 6, characterized in that the inner wall of the clamping jaw i (3022) is provided with tooth grooves (3023) which are uniformly distributed at intervals, and the horizontal section of the mounting frame (303) is provided with a rack (3031) which is matched with the tooth grooves (3023).

8. The automatic thermoplastic film preforming device for head radiotherapy according to claim 6, characterized in that the support bar (3021) in the shaping module (3) is an automatic telescopic bar.

9. The automatic thermoplastic film preforming device for head radiotherapy according to claim 6, wherein the support bar (3021) in the secondary stretching module (4) is U-shaped, one end of the support bar (3021) is inserted into the side wall of the base (1), the clamping jaw i (3022) is mounted at the other end of the support bar (3021), and the vertical section of the support bar (3021) is an automatic telescopic bar.

10. The automatic thermoplastic film preforming device for head radiotherapy according to claim 6, wherein the upper surface of the base (1) and the side surface of the base (1) are uniformly provided with inserting holes (101), and the lower end of the supporting rod (3021) is detachably arranged in the inserting holes (101).

11. The automatic thermoplastic film preforming device for head radiotherapy according to any of claims 2 to 10, characterized in that the press-fitting module (2) comprises a plurality of mounting seats (201) which can be close to or far from the shaping module (3), and the plurality of mounting seats (201) are arranged at intervals along the circumferential direction of the thermoplastic film; and clamping jaws II (203) matched with the thermoplastic film frame are arranged on the mounting seat (201), and the clamping jaws II (203) can move up and down on the mounting seat (201).

12. The automatic thermoplastic film preforming device for head radiotherapy according to claim 11, characterized in that the base (1) is also provided with a guide rail (204) extending towards the shaping module (3), and the mounting seat (201) is provided with a sliding block (205) which is in sliding fit with the guide rail (204); the base (1) is also provided with a linear driving mechanism for driving the mounting seat (201) to slide along the guide rail (204).

13. The automatic thermoplastic film preforming device for head radiotherapy according to claim 12, wherein the linear driving mechanism comprises a screw (206) rotatably supported on the base (1), a nut (207) matched with the screw (206) is further installed on the installation seat (201), and a driving motor (208) for driving the screw (206) to rotate is further installed in the sliding groove.

14. The automatic thermoplastic film preforming device for head radiotherapy according to claim 11, characterized in that the mounting base (201) is further provided with an upward extending telescopic cylinder (202), and the clamping jaw ii (203) is arranged at the output end of the telescopic cylinder (202).

15. The automatic thermoplastic film preforming device for head radiotherapy according to any of claims 2 to 10, characterized in that the plurality of main stretching rollers (301) in the shaping module (3) are arched in shape as a whole, and the arching degree of the plurality of main stretching rollers (301) as a whole is gradually reduced from the middle of the thermoplastic film to the edge of the thermoplastic film.