CN221431949U - Post-loading source applicator in rectum cavity - Google Patents
Post-loading source applicator in rectum cavity Download PDFInfo
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- CN221431949U CN221431949U CN202420288510.2U CN202420288510U CN221431949U CN 221431949 U CN221431949 U CN 221431949U CN 202420288510 U CN202420288510 U CN 202420288510U CN 221431949 U CN221431949 U CN 221431949U
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- tubular body
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- applicator
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- 210000000664 rectum Anatomy 0.000 title description 8
- 230000002285 radioactive effect Effects 0.000 claims abstract description 11
- 238000005452 bending Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 206010028980 Neoplasm Diseases 0.000 description 14
- 208000015634 Rectal Neoplasms Diseases 0.000 description 9
- 238000001959 radiotherapy Methods 0.000 description 8
- 206010038038 rectal cancer Diseases 0.000 description 8
- 201000001275 rectum cancer Diseases 0.000 description 8
- 238000002512 chemotherapy Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000002725 brachytherapy Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 210000000436 anus Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 210000000920 organ at risk Anatomy 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 230000001225 therapeutic effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 208000037956 transmissible mink encephalopathy Diseases 0.000 description 1
- 210000003708 urethra Anatomy 0.000 description 1
- 210000003932 urinary bladder Anatomy 0.000 description 1
- 210000004291 uterus Anatomy 0.000 description 1
- 210000001215 vagina Anatomy 0.000 description 1
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- Radiation-Therapy Devices (AREA)
Abstract
The utility model relates to a post-loading source applicator in a rectal cavity, which comprises a tubular body, wherein a first end of the tubular body is provided with an arc-shaped structure; a first channel is arranged in the tubular body at the center along the long axis direction of the tubular body, and a plurality of second channels are arranged around the first channel along the long axis direction of the tubular body, and the shapes of the first channel and the second channels are consistent with the trend of the long axis direction of the tubular body; one ends of the first channel and the plurality of second channels are arranged at the second end of the tubular body, and the second end of the tubular body is provided with openings corresponding to the first channel and the plurality of second channels respectively; the first channels are used for inserting shielding rods, and the plurality of second channels are used as source guiding pipes for placing radioactive sources. The shielding rod can be independently replaced, so that the internal irradiation point is closer to the focus position, and the requirements of different focus positions of different patients are met.
Description
Technical Field
The utility model relates to the technical field of medical appliances, in particular to a soft multichannel arc-shaped afterloading source applicator with a central shielding function in a rectal cavity.
Background
Treatment of rectal cancer generally includes surgery, chemotherapy, and radiation therapy. Of these, radiotherapy is an important component of the overall treatment of rectal cancer, and about 70% of patients need radiation therapy during the course of treatment. The international recommended rectal cancer treatment mode is direct operation of early rectal cancer, operation after synchronous radiotherapy and chemotherapy of middle and late rectal cancer, but the low-level rectal cancer operation treatment cannot reserve anus.
Because of the shortage of surgery treatment, TME complication rate is higher, the risk of affecting normal functions is higher, and the condition of patients can be completely relieved by radiotherapy and chemotherapy, the PCR rate is 15-25%, and anus can be reserved, so that more patients tend to select non-operative treatment schemes such as radiotherapy, chemotherapy and the like.
Brachytherapy treatment includes exposure to X-ray brachytherapy and high dose rate afterloading. The therapeutic equipment used for contact X-ray brachytherapy is PHILIPS RT, for example, and the machine of the therapeutic equipment is characterized by low voltage 50kV, short focal length 4cm, high output rate X-ray absorption mainly of 2 cm at first, narrow bulb tube, tubular shape, easy holding and capability of placing a special rectoscope. But the domestic radiotherapy center does not have the treatment equipment.
The high dose rate post-load treatment adopts 192Ir as a radioactive source, and the 192Ir is physically characterized by a half-life period of 74.5 days, an energy of 355keV, a lead equivalent of 0.24cm of a half-valence layer, and an irradiation dose which can be prescribed at any depth, and is generally 10mm away from the surface of an applicator can reach 100% of the prescribed dose. At present, large-scale radiotherapy centers in China all have high-dose rate post-treatment equipment.
The limiting factor of the prior art for the clinical application of rectal cancer after high dosage rate is mainly the applicator. There are a number of vulnerable organs in the treatment area of rectal cancer, including bladder, rectum, uterus, vagina, urethra, skin, etc., and shielding protectors are commonly used in the prior art to reduce the exposure to normal tissue, but they can cause discomfort to the patient.
The applicators in the prior art are generally straight barrel applicators, are in a hard cylindrical shape, are not matched with the curved anatomical shape of the rectum, cannot be perfectly fit with the running of the rectum, have poor tumor coverage rate, particularly poor coverage rate of the upper boundary of the tumor, and can cause discomfort in the treatment process of patients.
Disclosure of utility model
The utility model aims to provide a soft multichannel arc-shaped afterloading applicator with a central shielding in a rectal cavity, and aims to solve the technical problems of better covering the upper boundary of rectal tumors, adjusting the prescription dose of a tumor area and the dose of organs at risk of a non-tumor area, and accurately implementing afterloading treatment with high dose rate.
The utility model aims to solve the defects of the prior art and provides a post-loading applicator in a rectal cavity, which comprises a tubular body, wherein a first end of the tubular body is provided with an arc-shaped structure; a first channel is arranged in the tubular body at the center along the long axis direction of the tubular body, and a plurality of second channels are arranged around the first channel along the long axis direction of the tubular body, and the shapes of the first channel and the second channels are consistent with the trend of the long axis direction of the tubular body; one ends of the first channel and the plurality of second channels are arranged at the second end of the tubular body, and the second end of the tubular body is provided with openings corresponding to the first channel and the plurality of second channels respectively; the first channels are used for inserting shielding rods, and the plurality of second channels are used as source guiding pipes for placing radioactive sources.
As an implementation manner, the tubular body is made of a silica gel material, so as to be capable of bending and conforming to shape.
As one implementation mode, one end of the shielding rod is arc-shaped, and the radian of the arc is in the range of 28-78 degrees.
As one implementation, the arc of one end of the shielding rod has an arc of 30 °, or 45 °, or 60 °, or 75 °. As one implementation, the shielding rod is a tungsten alloy with a diameter of 1mm to 5mm.
As one implementation manner, the number of the second channels is 6, and the 6 second channels are uniformly distributed on the periphery of the first channel by taking the long axis of the first channel as the center.
As one implementation, the distance between the central axis of the second channel and the outer wall of the tubular body is 0.1cm to 1cm.
As one implementation, the diameter of the second channel is 1mm to 5mm. As one implementation, the tubular body has an inner diameter of 2 to 3cm and a length of 20 to 25cm.
Advantageous effects
Compared with the prior art, the utility model has the beneficial effects that:
The soft multichannel arc-shaped rear-mounted source applicator with the central shielding in the rectal cavity adopts the combination of the soft adjustable multichannel arc-shaped rear-mounted source applicator and the central arc-shaped shielding rod, fully fits the anatomical shape of the rectum, is beneficial to deeper penetration of the source applicator, increases the dose coverage rate of the upper end of a tumor, and improves the treatment comfort level of patients. The multi-channel applicator has a plurality of radiation source channels available for selection, and the appropriate radiation source channel can be selected according to the tumor location of the patient. The central arc shielding rod can effectively reduce the dosage of dangerous organs on the opposite sides of the tumor, and the high-dosage rate post-loading treatment is accurately implemented.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate and do not limit the utility model.
Fig. 1 is a schematic cross-sectional view of a soft multichannel arc-shaped post-load applicator in the rectal cavity according to the present utility model.
Fig. 2 is a schematic longitudinal section of the soft multi-channel arc-shaped post-load applicator in the rectal cavity according to the present utility model.
Fig. 3 is a schematic view of the structure of the central arc-shaped shield rod.
Fig. 4 is a schematic cross-sectional view of a combination of a central arcuate shield rod and a soft multichannel arcuate posterior applicator in the rectal cavity in accordance with the present utility model.
Detailed Description
The present utility model is described in more detail below to facilitate an understanding of the present utility model.
As shown in fig. 1 to 4, the intrarectal post-loading applicator of the embodiment of the present utility model comprises a tubular body having an arcuate structure at a first end thereof; a first channel is arranged in the tubular body at the center along the long axis direction of the tubular body, and a plurality of second channels are arranged around the first channel along the long axis direction of the tubular body, and the shapes of the first channel and the second channels are consistent with the trend of the long axis direction of the tubular body; one ends of the first channel and the plurality of second channels are arranged at the second end of the tubular body, and the second end of the tubular body is provided with openings corresponding to the first channel and the plurality of second channels respectively; the first channels are used for inserting shielding rods, and the plurality of second channels are used as source guiding pipes for placing radioactive sources. In fig. 1, D represents the diameter of the tubular body. Specifically, the post-loading source 1 in the rectal cavity of the embodiment of the utility model is a soft multi-channel arc post-loading source in the rectal cavity, the arc shielding rod 2 is inserted in the center of the tubular body of the post-loading source 1 in the rectal cavity, the soft multi-channel arc post-loading source 1 in the rectal cavity is made of silica gel material, the post-loading source can be freely bent and shaped, and 7 channels extending along the long axis direction of the source are arranged in the post-loading source. The central channel 11 is used for placing arc shielding rods, and 6 radioactive source channels 12 are equidistantly distributed around the central channel for retaining a catheter. The central channel 11 is the first channel, and the radiation source channel 12 is the second channel. The central arc shielding rod is arc-shaped, the radian of an arc formed by sleeving a central channel of the soft adjustable multi-channel arc rear-mounted source applicator can be 30 degrees, or 45 degrees, or 60 degrees, or 75 degrees, as shown in fig. 3 and 4, the arc shielding rods 2 with different arc radians are shown in fig. 3, wherein the arc shielding rod mark 21 with the arc radian of 30 degrees, the arc shielding rod mark 22 with the arc radian of 45 degrees, the arc shielding rod mark 23 with the arc radian of 60 degrees and the arc shielding rod mark 24 with the arc radian of 75 degrees are shown in fig. 3. The arc-shaped shielding rods 2 positioned in the center can be independently replaced according to the requirement, namely, the arc-shaped shielding rods with different arc degrees can be replaced at will. As an example, one end of the shielding rod is arc-shaped, and the radian of the arc is in the range of 28-78 degrees.
Preferably, the soft multi-channel arc-shaped rear-mounted source applicator 1 in the rectum cavity comprises 1 central channel 11 and 6 radioactive source channels 12, and the included angle between the circle center of each radioactive source channel and the connecting line of the circle centers of the central channels is 60 degrees.
Preferably, a virtual straight line passing through the center of the center channel 11 and the center of the radioactive source channel 12 is formed on the cross section of the soft multi-channel arc-shaped rear-mounted source applicator 1 in the rectal cavity, and extends to the outermost edge of the soft multi-channel arc-shaped rear-mounted source applicator in the rectal cavity and intersects with the outermost edge to form a virtual intersection point, and the distance between the center of the radioactive source channel 12 and the virtual intersection point is 0.1cm to 1cm.
Preferably, the diameter of the central passage 11 is 1mm to 5mm.
Preferably, the diameter of the source channel 12 is 1mm to 5mm.
Preferably, the material of the central arc shielding rod 2 is tungsten alloy, and the diameter is 1mm to 5mm.
It should be noted that, the part of the tube section at the rear end of the central arc-shaped shielding rod 2 is not an arc-shaped tube section, so that the bending angle is not counted; when the central arc-shaped shielding rod 2 is used, the sector angle corresponding to the front end bending part is an effective bending angle.
In a preferred embodiment, the outer surface of the central arc-shaped shielding rod 2 is provided with an angle indicator for displaying the bending angle, so as to facilitate rapid indication of the effective bending angle value of the soft multi-channel arc-shaped rear applicator 1 in the rectal cavity.
Further preferably, the external diameter R of the soft multichannel arc-shaped rear loading source 1 in the rectal cavity is 3-5cm, and the length L is 20-25cm.
The soft multichannel arc-shaped afterloading source applicator 1 in the rectal cavity can solve the problem of poor coverage of tumor upper boundary doses in high-dose-rate afterloading treatment in the rectal cavity. The arcuate design helps to improve the fit between the applicator and the rectum, increasing tumor coverage and patient comfort. In the preferred embodiment, the soft multichannel arc-shaped afterloading source applicator in the rectal cavity is provided with 6 channels for retaining the source guiding tube, a proper radioactive source channel can be selected according to the tumor position of a patient, and the prescription dose of a tumor area and the dose of organs at risk of a non-tumor area can be adjusted in multiple directions under the same conditions, so that the high-dose-rate afterloading treatment can be accurately implemented. A 192Ir radiation source is introduced into the source guiding tube, and the tumor is placed in a dose sweet zone through accurate dose calculation, so that the tumor treatment is optimized. Can precisely protect the wall of the non-irradiated intestine and reduce the toxic and side effects related to radiotherapy.
The foregoing describes preferred embodiments of the present utility model, but is not intended to limit the utility model thereto. Modifications and variations to the embodiments disclosed herein may be made by those skilled in the art without departing from the scope and spirit of the utility model.
Claims (9)
1. A post-load applicator within a rectal cavity, the post-load applicator comprising a tubular body having an arcuate structure at a first end thereof; a first channel is arranged in the tubular body at the center along the long axis direction of the tubular body, and a plurality of second channels are arranged around the first channel along the long axis direction of the tubular body, and the shapes of the first channel and the second channels are consistent with the trend of the long axis direction of the tubular body; one ends of the first channel and the plurality of second channels are arranged at the second end of the tubular body, and the second end of the tubular body is provided with openings corresponding to the first channel and the plurality of second channels respectively; the first channels are used for inserting shielding rods, and the plurality of second channels are used as source guiding pipes for placing radioactive sources.
2. The afterload applicator according to claim 1, wherein the tubular body is made of a silicone material to enable bending and conforming.
3. The afterloading applicator according to claim 1, wherein one end of the shielding rod is arc-shaped, and the arc-shaped radian is in the range of 28 ° to 78 °.
4. A rear applicator as claimed in claim 3 wherein the arc of one end of the shield rod is 30 ° or 45 ° or 60 ° or 75 °.
5. The afterload applicator of claim 1, wherein the shield rod is a tungsten alloy having a diameter of 1mm to 5mm.
6. The afterload applicator according to claim 1, wherein the number of the second channels is 6, and the 6 second channels are uniformly distributed around the outer circumference of the first channel with the long axis of the first channel as a center.
7. The afterload applicator according to claim 1, wherein a distance between a central axis of the second channel and an outer wall of the tubular body is 0.1cm to 1cm.
8. The afterload applicator according to claim 1, wherein the diameter of the second channel is 1mm to 5mm.
9. The afterload applicator according to claim 1, wherein the tubular body has an inner diameter of 2 to 3cm and a length of 20 to 25cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420288510.2U CN221431949U (en) | 2024-02-07 | 2024-02-07 | Post-loading source applicator in rectum cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420288510.2U CN221431949U (en) | 2024-02-07 | 2024-02-07 | Post-loading source applicator in rectum cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221431949U true CN221431949U (en) | 2024-07-30 |
Family
ID=92065219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420288510.2U Active CN221431949U (en) | 2024-02-07 | 2024-02-07 | Post-loading source applicator in rectum cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221431949U (en) |
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2024
- 2024-02-07 CN CN202420288510.2U patent/CN221431949U/en active Active
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