Breast skin dilator for radioactive therapy

Abstract

The breast skin dilator comprises a dilator body, a first bag, a second bag and a third bag, the dilator body is hemispherical, and a containing space is formed in the dilator body; the first bag is in a bowl shape, a first bag cavity is formed in the first bag, the first bag is arranged in the containing space, the outer wall of the outer circle of the first bag is connected to the spherical inner wall of the dilator body, and the first bag cavity communicates with a first input pipe and a first output pipe. The second bag is spherical or ellipsoidal, a second bag cavity is formed in the second bag, the second bag is arranged in the containing space and located at the edge connecting position of the plane inner wall and the spherical inner wall of the dilator body, and the second bag cavity communicates with a second input pipe and a second output pipe; the third bag is spherical or ellipsoidal, a third bag cavity is formed in the third bag, the third bag is arranged in the containing space and located at the edge connecting position of the plane inner wall and the spherical inner wall of the dilator body, and the third bag cavity is communicated with a third input pipe and a third output pipe.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a breast skin expander for radiotherapy. Background Technology

[0002] After undergoing breast tissue removal surgery, patients often have implants inserted to improve their appearance. However, even after tissue removal, tumor cells may still spread. Therefore, targeted radiotherapy is necessary after surgery based on the actual spread of tumor cells.

[0003] The principle of radiotherapy is to irradiate the target area with a device that delivers radioactive elements, and the decay of these radioactive elements inhibits and treats tumor cells. During the decay process of the radioactive elements, the material of the prosthesis may deform. Therefore, prostheses cannot be present in the patient's body during the entire course of radiotherapy; they can only be implanted after the radiotherapy course is completed.

[0004] To prevent the skin and tissue from healing during radiotherapy, a skin expander containing saline solution is usually implanted into the patient as a transition, so that the expander can be replaced with a prosthesis later.

[0005] Radiotherapy treatment has a long cycle and often requires multiple intervals. However, the number of radiotherapy equipment and professional doctors in hospitals is insufficient to meet the needs of a large number of patients receiving radiotherapy at the same time. As a result, patients have long waiting times for radiotherapy, which wastes a lot of time for both patients and doctors. Summary of the Invention

[0006] The purpose of this application is to provide a breast skin expander for radiotherapy, which enables the injection of a radioactive solution into the skin expander for radiotherapy, thereby reducing the need for radiotherapy equipment and the number of physicians operating the equipment, reducing the waiting time for patients to receive radiotherapy, and improving the efficiency of hospital operations.

[0007] To achieve the above objectives, this application provides the following technical solution: This application discloses a breast skin expander for radiotherapy, comprising an expander body, a first capsule, a second capsule, and a third capsule. The expander body is hemispherical and has an internal accommodating space. The first capsule is bowl-shaped and has a first cavity inside, which is housed within the accommodating space, and its outer circular wall is connected to the spherical inner wall of the expander body. The first cavity is connected to a first input tube and a first output tube. The second capsule is spherical or ellipsoidal and has a second cavity inside, which is housed within the accommodating space and located at the edge connection between the planar inner wall and the spherical inner wall of the expander body. The second cavity is connected to a second input tube and a second output tube. The third capsule is spherical or ellipsoidal and has a third cavity inside, which is housed within the accommodating space and located at the edge connection between the planar inner wall and the spherical inner wall of the expander body. The third cavity is connected to a third input tube and a third output tube.

[0008] In one embodiment, the breast skin expander further includes a magnetic valve, the magnetic valve having a first channel, a second channel, a third channel and a fourth channel spaced apart inside, a first input tube connected to the first channel, a second input tube connected to the second channel, a third input tube connected to the third channel, and a first output tube, a second output tube and a third output tube respectively connected to the fourth channel.

[0009] In one embodiment, the breast skin expander further includes a main input tube and a main output tube. A magnetic valve is built into the accommodating space and located between the inner circular outer wall of the first capsule and the planar inner wall of the expander body. One end of the main input tube extends into the accommodating space and communicates with the first channel, the second channel and the third channel. The other end of the main input tube extends to the outside of the expander body. One end of the main output tube extends into the accommodating space and communicates with the fourth channel. The other end of the main output tube extends to the outside of the expander body.

[0010] In one embodiment, the magnetic valve has a first position, a second position, and a third position; when the magnetic valve is in the first position, the first channel is in a closed state, the second and third channels are in a closed state, and the main input pipe is connected to the first channel; when the magnetic valve is in the second position, the second channel is in a closed state, the first and third channels are in a closed state, and the main input pipe is connected to the second channel; when the magnetic valve is in the third position, the third channel is in a closed state, the first and second channels are in a closed state, and the main input pipe is connected to the third channel.

[0011] In one embodiment, the magnetic valve is further provided with a fifth channel and a sixth channel spaced apart. The fifth channel is perpendicular to and connects the first channel, the second channel, and the third channel, and the sixth channel is perpendicular to and connects the first channel, the second channel, and the third channel. A first magnet is provided in the fifth channel and can slide back and forth along the fifth channel. The first magnet has a first position and a second position in the fifth channel and a seventh channel is provided on the first magnet. A second magnet is provided in the sixth channel and can slide back and forth along the sixth channel. The second magnet has a third position and a fourth position in the sixth channel and an eighth channel is provided on the second magnet.

[0012] In one embodiment, when the magnetic valve is in the first position, the first magnet is in the first position, the second magnet is in the third position, the first magnet closes the second channel, the seventh channel is connected to the first channel, the second magnet closes the third channel, the eighth channel is connected to the first channel, and the main input pipe is connected to the first input pipe through the first channel; when the magnetic valve is in the second position, the first magnet is in the first position, the second magnet is in the fourth position, the first magnet closes the third channel, the second magnet closes the first channel, and the main input pipe is connected to the second input pipe through the second channel; when the magnetic valve is in the third position, the first magnet is in the second position, the second magnet is in the third position, the first magnet closes the first channel, the second magnet closes the second channel, and the main input pipe is connected to the third input pipe through the third channel.

[0013] In one embodiment, the magnetic pole of the first magnet facing the first position is the first magnetic pole, the magnetic pole of the first magnet facing the second position is the second magnetic pole, the magnetic pole of the second magnet facing the third position is the third magnetic pole, and the magnetic pole of the second magnet facing the fourth position is the fourth magnetic pole. The first and third magnetic poles have the same magnetism, and the second and fourth magnetic poles have the same magnetism.

[0014] In one embodiment, a first spring is further provided in the seventh channel, and a second spring is further provided in the eighth channel. The first magnetic pole abuts against the end of the seventh channel through the first spring, and the fourth magnetic pole abuts against the end of the eighth channel through the second spring. When the magnetic valve is in the first position, the first spring and the second spring are respectively in the first compression state, the second magnetic pole abuts against the end of the seventh channel away from the first spring, and the third magnetic pole abuts against the end of the eighth channel away from the second spring. When the magnetic valve is in the second position, the first spring is in the first compression state, the second spring is in the second compression state, the second magnetic pole abuts against the end of the seventh channel away from the first spring, and the third magnetic pole is separated from the end of the sixth channel. When the magnetic valve is in the third position, the first spring is in the second compression state, the second spring is in the first compression state, the third magnetic pole abuts against the end of the eighth channel away from the second spring, and the second magnetic pole is separated from the end of the fifth channel.

[0015] In one embodiment, a first check valve is connected to the first output pipe, a second check valve is connected to the second output pipe, and a third check valve is connected to the third output pipe.

[0016] Analysis reveals that this invention discloses a breast skin expander for radiotherapy. When implanted in a patient, a trained physician or nurse can control three positions of a magnetic valve via an external electromagnet and connect it to a Geiger counter via a syringe or infusion pump. A pre-set dose of radioactive solution, according to the treatment course, is then introduced into the first, second, and / or third capsules through the main inlet tube and the magnetic valve. The radioactive solution in the first capsule can target the patient's breast area for radiotherapy, while the radioactive solutions in the second and third capsules can target the area near the patient's clavicle for radiotherapy. After the radiotherapy session concludes, trained physicians or nurses can control the three positions of the magnetic valve using an external electromagnet. A Geiger counter is then connected via a syringe or infusion pump, and large quantities of saline and iodine solution are injected into the first, second, and / or third capsules through the main inlet tube and magnetic valve, respectively. This process empties and cleanses the radioactive solution from these capsules. The drained radioactive solution is then expelled through the first and / or second and / or third outlet tubes, the magnetic valve, and the main outlet tube before exiting the patient's body. Finally, once the Geiger counter detects complete evacuation, the first, second, and / or third capsules are filled with saline, completing the single radiotherapy session. This procedure reduces the patient's reliance on the radiotherapy equipment, effectively saving patients' waiting time and physicians' working hours, while also significantly improving hospital efficiency. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Figure 1 A schematic cross-sectional view of a breast skin expander for radiotherapy provided as an embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the middle CC section; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the middle DD; Figure 4 A schematic diagram of the structure of a magnetic valve in a breast skin expander for radiotherapy, provided for an embodiment of this application; Figure 5 A cross-sectional schematic diagram of a magnetic valve in a breast skin expander for radiotherapy, provided for an embodiment of this application; Figure 6 This is a schematic diagram of a breast skin expander for radiotherapy, provided as an embodiment of this application, in the patient's body.

[0018] Explanation of reference numerals in the attached figures: 1. Expander body; 101. Accommodating space; 2. First capsule; 201. First cavity; 3. Second capsule; 301. Second cavity; 4. Third capsule; 401. Third cavity; 5. Magnetic valve; 5a. First channel; 5b. Second channel; 5c. Third channel; 5d. Fifth channel; 5e. Sixth channel; 5f. Fourth channel; 501. Main input pipe; 501a. First input pipe; 501b. Second input pipe; 501c. Third input pipe; 502. Main output tube; 502a, first output tube; 502b, second output tube; 502c, third output tube; 502d, first check valve; 502e, second check valve; 502f, third check valve; 503, first magnet; 503a, seventh channel; 504, second magnet; 504a, eighth channel; 505, first spring; 506, second spring; 6, patient; 7, clavicle; A, saline solution; B, radioactive solution; E, breast area; F, surrounding area. Detailed Implementation

[0019] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0020] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; direct connections or indirect connections through intermediate components; wired connections, radio connections, or wireless communication signal connections. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] The accompanying drawings illustrate one or more examples of this application. The detailed description uses numerical and alphabetic designations to refer to features in the drawings. Similar or analogous designations in the drawings and description have been used to refer to similar or analogous parts of this application. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components. Example

[0022] like Figures 1 to 6 As shown, according to an embodiment of this application, a breast skin expander for radiotherapy is provided, which includes an expander body 1, a first capsule 2, a second capsule 3, a third capsule 4, and a magnetic valve 5.

[0023] Specifically, the dilator body 1 has planar sidewalls and spherical sidewalls, which together form a closed hemispherical structure. The interior of the dilator body 1 has a accommodating space 101 that can hold physiological saline A. A first capsule 2, a second capsule 3, and a third capsule 4 are respectively housed within the accommodating space 101. The first capsule 2 has a bowl-shaped structure, and its outer circular wall is connected to the spherical inner wall of the dilator body 1. The second capsule 3 and the third capsule 4 have spherical or ellipsoidal structures, and their spherical outer walls are respectively connected to the edges of the planar and spherical inner walls of the dilator body 1. The first capsule 2 has a first cavity 201, the second capsule 3 has a second cavity 301, and the third capsule 4 has a third cavity 401. The first cavity 201, the second cavity 301, and the third cavity 401 are independent of each other and do not communicate with each other. The first capsule 201, the second capsule 301, and the third capsule 401 can each contain, individually or simultaneously, a radioactive solution B or physiological saline A containing sulfur colloid or iodine-131. The first capsule 2 has a first input tube 501a and a first output tube 502a, which are respectively connected to the first capsule 2. The second capsule 3 has a second input tube 501b and a second output tube 502b, which are respectively connected to the second capsule 3. The third capsule 4 has a third input tube 501c and a third output tube 502c, which are respectively connected to the third capsule 4. A first check valve 502d is connected to the first output tube 502a, a second check valve 502e is connected to the second output tube 502b, and a third check valve 502f is connected to the third output tube 502c. The magnetic valve 5 is built into the accommodating space 101 and is located between the inner outer wall of the first capsule 2 and the planar inner wall of the expander body 1. The surface of the magnetic valve 5 is connected to the inner outer wall of the first capsule 2. The magnetic valve 5 has a first channel 5a, a second channel 5b, a third channel 5c, a fourth channel 5f, a fifth channel 5d, and a sixth channel 5e. The fourth channel 5f, the second channel 5b, the first channel 5a, and the third channel 5c are arranged alternately, and the fifth channel 5d and the sixth channel 5e are arranged alternately, and the fifth channel 5d and the sixth channel 5e are perpendicular to the first channel 5a, the second channel 5b, and the third channel 5c. The first channel 5a, the second channel 5b, and the third channel 5c are interconnected through the fifth channel 5d, and the first channel 5a, the second channel 5b, and the third channel 5c are interconnected through the sixth channel 5e.The magnetic valve 5 has a main input pipe 501 and a main output pipe 502 on its exterior. One end of the main input pipe 501 extends into the accommodating space 101 and connects to the first channel 5a, the second channel 5b, and the third channel 5c. The other end of the main input pipe 501 extends to the exterior of the dilator body 1. One end of the main output pipe 502 extends into the accommodating space 101 and connects to the fourth channel 5f. The other end of the main output pipe 502 extends to the exterior of the dilator body 1. The first bladder 201 is connected to the first channel 5a through the first input pipe 501a, the second bladder 301 is connected to the second channel 5b through the second input pipe 501b, and the third bladder 401 is connected to the third channel 5c through the third input pipe 501c. The first bladder 201 is connected to the fourth channel 5f through the first output pipe 502a, the second bladder 301 is connected to the fourth channel 5f through the second output pipe 502b, and the third bladder 401 is connected to the fourth channel 5f through the third output pipe 502c. A first magnet 503, capable of reciprocating along the fifth channel 5d, is disposed within the fifth channel 5d, and a second magnet 504, capable of reciprocating along the sixth channel 5e, is disposed within the sixth channel 5e. A seventh channel 503a is formed on the first magnet 503, and an eighth channel 504a is formed on the second magnet 504. The first magnet 503 has opposing first and second magnetic poles, and the second magnet 504 has opposing third and fourth magnetic poles. The first and third magnetic poles are magnetically identical and oriented in the same direction, as are the second and fourth magnetic poles. A first spring 505 is also disposed within the fifth channel 5d, through which the first magnetic pole abuts against the end of the fifth channel 5d near the second channel 5b. A second spring 506 is also disposed within the sixth channel 5e, through which the fourth magnetic pole abuts against the end of the sixth channel 5e near the third channel 5c. The first magnet 503, influenced by the magnetism and pole changes of an external electromagnet, has a first position and a second position within the fifth channel 5d. The first spring 505 has a first compressed state and a second compressed state corresponding to the first and second positions. The second magnet 504, influenced by the magnetism and pole changes of an external electromagnet, has a third position and a fourth position within the sixth channel 5e. The second spring 506 has a first compressed state and a second compressed state corresponding to the third and fourth positions. The magnetic valve 5 has corresponding first, second, and third positions based on the changes in the first and second positions of the first magnet 503 and the third and fourth positions of the second magnet 504. When the magnetic valve 5 is not affected by the magnetism and magnetic poles of the external electromagnet, the first magnet 503 is in the first position, the first spring 505 is in the first compression state, the second magnet 504 is in the third position, and the second spring 506 is in the first compression state. At this time, the first magnet 503 closes the third channel 5c and the seventh channel 503a is connected to the first channel 5a. The second magnet 504 closes the second channel 5b and the eighth channel 504a is connected to the first channel 5a, so that the main input pipe 501 is connected to the first channel 5a.When the side of the magnetic valve 5 near the fourth channel 5f is affected by a magnetic pole opposite to the first and third magnetic poles, the first magnet 503 does not change position because the second magnetic pole abuts against the end of the fifth channel 5d near the third channel 5c. The second magnet 504 slides from the third position to the fourth position under the action of like poles repulsion, so that the first magnet 503 is in the first position, the first spring 505 is in the first compression state, the second magnet 504 is in the fourth position, and the second spring 506 is in the second compression state. At this time, the first magnet 503 closes the third channel 5c, and the second magnet 504 closes the first channel 5a, so that the main input pipe 501 is connected to the second channel 5b. When the side of the magnetic valve 5 furthest from the fourth channel 5f is affected by a magnetic pole opposite to the second and fourth magnetic poles, the second magnet 504 does not change position because the third magnetic pole abuts against the end of the sixth channel 5e near the second channel 5b. The first magnet 503 slides from the first position to the second position under the action of like poles repulsion, so that the first magnet 503 is in the second position, the first spring 505 is in the second compression state, the second magnet 504 is in the third position, and the second spring 506 is in the first compression state. At this time, the first magnet 503 closes the first channel 5a, and the second magnet 504 closes the second channel 5b, so that the main input pipe 501 is connected to the third channel 5c.

[0024] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: An embodiment of this application provides a breast skin expander for radiotherapy. When implanted in patient 6, the operator, a physician or nurse trained in the relevant instruments, can control the three positions of the magnetic valve 5 via an external electromagnet device. A Geiger counter is connected via a syringe or infusion pump, and a radioactive solution B with a preset rated content according to the treatment course is introduced into the first cavity 201, the second cavity 301, and / or the third cavity 401 through the main input tube 501 and the magnetic valve 5, respectively. The radioactive solution B in the first cavity 201 can be used for radiotherapy of the breast region E of patient 6, while the radioactive solution B in the second cavity 301 and the third cavity 401 can be used for radiotherapy of the region F near the clavicle 7 of patient 6. After the radiotherapy session concludes, trained physicians or nurses can control the three positions of the magnetic valve 5 using an external electromagnet. A Geiger counter is then connected via a syringe or infusion pump, and large quantities of saline solution A and iodine solution are injected through the main inlet tube 501 and the magnetic valve 5 into the first cavity 201, the second cavity 301, and / or the third cavity 401, respectively. This process empties and cleanses the radioactive solution B from the first cavity 201, the second cavity 301, and / or the third cavity 401 using saline solution A and iodine solution. The radioactive solution B discharged through saline solution A and iodine solution is then discharged from the patient's body through the first outlet tube 502a and / or the second outlet tube 502b and / or the third outlet tube 502c, the magnetic valve 5, and the main outlet tube 502. Finally, once the Geiger counter detects that the radioactive solution B has been completely emptied, the first cavity 201, the second cavity 301, and / or the third cavity 401 are filled with saline solution A, thus completing the entire single radiotherapy session. The above-mentioned radiotherapy procedures can reduce the patient's need for radiotherapy equipment, effectively saving a significant amount of patient's radiotherapy waiting time and the working time of the equipment operator, while also effectively improving the hospital's work efficiency.

[0025] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A breast skin expander for radiotherapy, characterized in that, include: The expander body is hemispherical and has an internal accommodating space; The first capsule is bowl-shaped and has a first cavity inside. The first capsule is built into the accommodating space and its outer circular wall is connected to the spherical inner wall of the expander body. The first cavity is connected to a first input tube and a first output tube. The second capsule is spherical or ellipsoidal and has a second cavity inside. The second capsule is built into the accommodating space and is located at the edge of the inner wall of the expander body and the inner wall of the spherical surface. The second cavity is connected to a second input tube and a second output tube. as well as The third capsule is spherical or ellipsoidal and has a third cavity inside. The third capsule is built into the accommodating space and is located at the edge of the inner wall of the expander body and the inner wall of the spherical surface. The third cavity is connected to a third input tube and a third output tube.

2. A breast skin expander for radiotherapy according to claim 1, characterized in that, Also includes: A magnetic valve has a first channel, a second channel, a third channel and a fourth channel spaced apart inside. The first input tube is connected to the first channel, the second input tube is connected to the second channel, the third input tube is connected to the third channel, and the first output tube, the second output tube and the third output tube are respectively connected to the fourth channel.

3. A breast skin expander for radiotherapy according to claim 2, characterized in that, Also includes: The main input pipe and the main output pipe are provided. The magnetic valve is built into the accommodating space and located between the inner outer wall of the first capsule and the inner planar wall of the expander body. One end of the main input pipe extends into the accommodating space and communicates with the first channel, the second channel and the third channel. The other end of the main input pipe extends to the outside of the expander body. One end of the main output pipe extends into the accommodating space and communicates with the fourth channel. The other end of the main output pipe extends to the outside of the expander body.

4. A breast skin expander for radiotherapy according to claim 3, characterized in that, The magnetic valve has a first position, a second position, and a third position; When the magnetic valve is in the first position, the first channel is in a closed state, the second channel and the third channel are in a closed state, and the main input pipe is connected to the first channel. When the magnetic valve is in the second position, the second channel is in a closed state, the first channel and the third channel are in a closed state, and the main input pipe is connected to the second channel. When the magnetic valve is in the third position, the third channel is in a closed state, the first channel and the second channel are in a closed state, and the main input pipe is connected to the third channel.

5. A breast skin expander for radiotherapy according to claim 4, characterized in that, The magnetic valve is further provided with a fifth channel and a sixth channel spaced apart inside. The fifth channel is perpendicular to and connects the first channel, the second channel and the third channel. The sixth channel is perpendicular to and connects the first channel, the second channel and the third channel. A first magnet is provided in the fifth channel, and the first magnet can slide back and forth along the fifth channel. The first magnet has a first position and a second position in the fifth channel, and a seventh channel is opened on the first magnet. A second magnet is provided in the sixth channel, and the second magnet can slide back and forth along the sixth channel. The second magnet has a third position and a fourth position in the sixth channel, and an eighth channel is opened on the second magnet.

6. A breast skin expander for radiotherapy according to claim 5, characterized in that, When the magnetic valve is in the first position, the first magnet is in the first position, the second magnet is in the third position, the first magnet closes the second channel, the seventh channel is connected to the first channel, the second magnet closes the third channel, the eighth channel is connected to the first channel, and the main input pipe is connected to the first input pipe through the first channel; When the magnetic valve is in the second position, the first magnet is in the first position, the second magnet is in the fourth position, the first magnet closes the third channel, the second magnet closes the first channel, and the main input pipe is connected to the second input pipe through the second channel. When the magnetic valve is in the third position, the first magnet is in the second position, the second magnet is in the third position, the first magnet closes the first channel, the second magnet closes the second channel, and the main input pipe is connected to the third input pipe through the third channel.

7. A breast skin expander for radiotherapy according to claim 6, characterized in that, The magnetic pole of the first magnet facing the first position is the first magnetic pole, the magnetic pole of the first magnet facing the second position is the second magnetic pole, the magnetic pole of the second magnet facing the third position is the third magnetic pole, and the magnetic pole of the second magnet facing the fourth position is the fourth magnetic pole. The first magnetic pole and the third magnetic pole have the same magnetism, and the second magnetic pole and the fourth magnetic pole have the same magnetism.

8. A breast skin expander for radiotherapy according to claim 7, characterized in that, The seventh channel is further provided with a first spring, and the eighth channel is further provided with a second spring. The first magnetic pole abuts against the end of the seventh channel through the first spring, and the fourth magnetic pole abuts against the end of the eighth channel through the second spring. When the magnetic valve is in the first position, the first spring and the second spring are respectively in the first compression state, the second magnetic pole abuts against the end of the seventh channel away from the first spring, and the third magnetic pole abuts against the end of the eighth channel away from the second spring; When the magnetic valve is in the second position, the first spring is in the first compressed state, the second spring is in the second compressed state, the second magnetic pole abuts against the end of the seventh channel away from the first spring, and the third magnetic pole separates from the end of the sixth channel; When the magnetic valve is in the third position, the first spring is in the second compression state, the second spring is in the first compression state, the third magnetic pole abuts against the end of the eighth channel away from the second spring, and the second magnetic pole separates from the end of the fifth channel.

9. A breast skin expander for radiotherapy according to claim 2, characterized in that, A first check valve is connected to the first output pipe, a second check valve is connected to the second output pipe, and a third check valve is connected to the third output pipe.

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