Novel afterloading source applicator in rectum cavity

Abstract

The invention discloses a novel afterloading source applicator in a rectum cavity, the novel afterloading source applicator comprises a flexible source applicator main body, a unit combined lead blocking group and a tail sealing device, the unit combined lead blocking group is placed into the flexible source applicator main body along a guide rail during combination, and the flexible source applicator main body is in threaded connection with the tail sealing device. The positioning support ring at the opening of the flexible polyurethane shell is provided with a guide rail which is used for positioning when the unit combined lead blocking group is mounted, the positioning sleeve with the thread is provided with an annular groove and is riveted and fixed with the flexible polyurethane shell, and the opening of the flexible polyurethane shell is provided with a strip-shaped groove which is used for positioning the mounting pressing block. The flexible source applicator shell is used for replacing a traditional hard shell, the problem that a traditional hard blocking lead cannot be bent is solved through the design of the unit combined type blocking lead, meanwhile, the four-channel radioactive source channel is arranged in the blocking lead unit, one or more used channels can be selected in a planned mode according to the tumor position, and therefore the tumor source applicator is convenient to use. Accurate dose after-loading treatment is realized, and toxic and side effects are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a novel flexible post-loading source applicator in a rectal cavity. Background Art

[0002] Brachytherapy is an important local radiotherapy method. By placing the radiation source directly on or close to the tumor tissue, it can deliver high-dose radiation to the local tumor while minimizing damage to surrounding normal tissues.

[0003] Afterloading technology is the main implementation method of brachytherapy, which allows the applicator to be accurately placed in the target area first, and then the radiation source is transported to the applicator through the pipeline system for irradiation. This method improves the accuracy and safety of radiation source placement, and can flexibly adjust the dose distribution according to the shape, size and location of the tumor.

[0004] In actual applications, existing post-loading applicators in the rectum are often difficult to accurately fix in the ideal position in the rectum. Due to the anatomical characteristics of the rectum, such as the softness and peristalsis of the rectal wall, and the differences in the length and curvature of the rectum between individuals, the applicator may be displaced or rotated during the insertion process, resulting in the inability of the radiation source to accurately aim at the tumor target area. This may result in insufficient radiation dose to the tumor tissue, affecting the treatment effect, while increasing the risk of over-irradiation of surrounding normal tissues (such as the bladder, prostate, uterus and other organs around the rectum). Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a new flexible after-loading applicator for use in the rectal cavity. The technical problem to be solved is: how to improve the conformity of the applicator to the patient's body, reduce the pain of the patient when the applicator is indwelling, and at the same time reduce the dose to organs at risk in non-tumor areas, thereby achieving precise dose after-loading treatment.

[0006] The solution to achieve the above-mentioned purpose is a new type of post-loading source applicator in the rectal cavity that can bend and conform to the shape, that is, a new type of post-loading source applicator in the rectal cavity, which is mainly composed of a flexible source applicator body, a unit-combined lead block group and a tail sealing device. When assembled, the unit-combined lead block group is placed into the flexible source applicator body along the guide rail, and the flexible source applicator body is connected to the tail sealing device by threads.

[0007] Furthermore, the flexible applicator body includes a flexible polyurethane shell, a plurality of guide support rings and a positioning support ring are embedded and installed at equal intervals inside the flexible polyurethane shell, and a threaded positioning sleeve is embedded in the opening of the flexible polyurethane shell.

[0008] The preferred embodiment of the above scheme is that the positioning support ring at the opening of the flexible polyurethane shell is provided with a guide rail for positioning the unit combined lead block during installation; the threaded positioning sleeve is provided with an annular groove, which is mortised and fixed to the flexible polyurethane shell; and a strip groove is provided at the opening of the flexible polyurethane shell for positioning and installing the pressure block.

[0009] Furthermore, the unit-combined lead block group includes a lead block unit and a radiation source guide tube, and a ball joint protrusion and a ball joint groove are respectively provided at both ends of the lead block unit. The ball joint protrusion of the single lead block unit and the ball joint groove of the adjacent lead block unit are adaptively connected to form a spherical joint. Two adjacent lead blocks in the spherical joint can slip slightly, and the lead block group achieves bending conformity through the relative sliding of multiple spherical joints.

[0010] The preferred embodiment of the above scheme is that the lead blocking unit is evenly arranged circumferentially with a plurality of radiation source channels extending along the long axis direction of the flexible polyurethane shell, each of the radiation source channels is embedded with a radiation source guide tube, and the radiation source guide tube is used for retaining the source guide tube.

[0011] Furthermore, the tail sealing device includes a pressure block and a pressure cover. The pressure block can be embedded in the groove at the opening of the flexible polyurethane shell. The pressure cover is fixedly connected to the positioning sleeve by threads, and the pressure block is fixed at the same time. The pressure block can limit the longitudinal displacement of the unit combined lead block group.

[0012] The beneficial effects of the present invention are as follows: the technical solution provided by the present application is based on the existing traditional single-channel applicator including a hard applicator shell, a hard lead shield and an applicator channel. By using a flexible applicator shell to replace the traditional hard shell, and then by the design of a unit-combined lead shield, the problem that the traditional hard lead shield cannot be bent is solved, and it can better adapt to the physiological curvature of the rectum, improve the coverage of the high-position target area, and reduce the fitting pressure on the rectal wall. At the same time, the lead shield unit has a built-in four-channel radiation source channel, which can systematically select one or more channels to be used according to the tumor location, reduce the dose of organs at risk in non-tumor areas, achieve precise dose afterloading treatment, and reduce toxic and side effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly describe the technical solution in the present invention, the drawings required in the embodiments or prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0014] Figure 1 The present invention is a cross-sectional view of a novel post-loading source applicator in the rectal cavity.

[0015] Figure 2 The present invention is a cross-sectional view of a positioning support ring of a novel post-loading source applicator in the rectal cavity.

[0016] Figure 3 The present invention provides a cross-sectional view and a top view of a lead retaining unit of a novel post-loading source applicator in a rectal cavity.

[0017] In the figure: 1-flexible polyurethane shell; 2-lead blocking unit; 3-guide support ring; 4-positioning support ring; 5-positioning sleeve; 6-pressure block; 7-tail seal; 8-source applicator guide tube; 21-ball joint protrusion; 22, ball joint groove; 23-source applicator channel; 24-lead blocking guide groove; 41-support ring guide rail. DETAILED DESCRIPTION

[0018] like Figure 1 to Figure 3 The figure shows a new type of post-loading source applicator in the rectal cavity provided by the present invention. The new type of flexible post-loading source applicator in the rectal cavity includes a flexible polyurethane shell 1, a lead blocking unit 2, a guide support ring 3, a positioning support ring 4, a positioning sleeve 5, a pressure block 6, a tail seal 7 and a source applicator guide tube 8.

[0019] Furthermore, ten guide support rings 3 and one positioning support ring 4 are embedded and installed at equal intervals inside the flexible polyurethane shell 1 to ensure that the whole has a certain degree of flexibility, and a positioning sleeve 5 is installed at the opening of the flexible polyurethane shell 1. The positioning support ring 4 at the opening of the flexible polyurethane shell 1 has a guide rail for positioning the lead retaining unit 2 during installation, and the positioning sleeve 5 is provided with an annular groove to be mortised and fixed to the flexible polyurethane shell 1, and a strip groove is provided at the opening of the flexible polyurethane shell 1 for positioning and installing the pressure block 6.

[0020] Furthermore, a ball joint protrusion 21 and a ball joint groove 22 are respectively provided at both ends of the lead blocking unit 2. The ball joint protrusion 21 of the single lead blocking unit 2 and the ball joint groove 22 of the adjacent lead blocking unit are adaptively connected to form a spherical joint. Two adjacent lead blocking units 2 in the spherical joint can have a small slippage. The lead blocking group achieves bending conformity through the relative slippage of multiple spherical joints. The lead blocking unit 2 is evenly arranged in the circumferential direction with four radiation source channels 23 extending along the long axis direction of the flexible polyurethane shell 1. Each radiation source channel 23 is embedded with a radiation source guide tube 8, and the radiation source guide tube 8 is used to retain the source guide tube.

[0021] Furthermore, the pressing block 6 can be embedded in the groove at the opening of the flexible polyurethane shell 1, and the pressure cover 7 is fixedly connected to the positioning sleeve 5 by threads, thereby fixing the pressing block 6, and the pressing block 6 can limit the longitudinal displacement of the lead blocking unit 2.

[0022] Preferably, the technical solution provided by the present invention is based on the existing traditional single-channel applicator including a hard applicator shell, a hard lead stopper and an applicator channel. By using a flexible polyurethane shell 1 to replace the traditional hard shell and then through the design of the lead stopper unit 2, the problem that the traditional hard lead stopper cannot be bent is solved, and it can better adapt to the physiological curvature of the rectum, improve the coverage of the high-position target area, and reduce the fitting pressure on the rectal wall.

[0023] Further preferably, the lead blocking unit 2 has four symmetrical radiation source channels 23 built in, which can systematically select one or several radiation source channels 23 for use according to the tumor location, thereby reducing the dose of organs at risk in non-tumor areas, achieving precise dose afterloading therapy, and reducing toxic and side effects.

[0024] The embodiments should not be regarded as limiting the present invention, but any improvement based on the spirit of the present invention should be within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A novel post-loading applicator for rectal cavity, characterized in that: It is mainly composed of a flexible source applicator body, a unit-combined lead blocking group and a tail sealing device. When assembled, the unit-combined lead blocking group is placed into the flexible source applicator body along the guide rail, and the flexible source applicator body is connected to the tail sealing device by a thread; the tail sealing device includes a pressure block and a pressure cover, and the flexible source applicator body includes a flexible polyurethane shell, and a plurality of guide support rings and a positioning support ring are embedded and installed at equal intervals inside the flexible polyurethane shell, and a positioning sleeve with a thread is embedded at the opening of the flexible polyurethane shell; the positioning support ring at the opening of the flexible polyurethane shell is provided with a guide rail for positioning the unit-combined lead blocking group during installation, and the positioning sleeve with a thread is provided with an annular groove, which is mortised and fixed to the flexible polyurethane shell, and a strip groove is provided at the opening of the flexible polyurethane shell for positioning and installing the pressure block; the unit-combined lead blocking group includes a lead blocking unit and a radiation source guide tube, and the lead blocking unit is evenly arranged circumferentially with a plurality of radiation source channels extending along the long axis direction of the flexible polyurethane shell, and each of the radiation source channels is embedded with a radiation source guide tube, and the radiation source guide tube is used for retaining the source guide tube.

2. A novel post-loading source applicator for rectal cavity according to claim 1, characterized in that: A ball joint protrusion and a ball joint groove are respectively provided at both ends of the lead stop unit. The ball joint protrusion of a single lead stop unit and the ball joint groove of an adjacent lead stop unit are adaptively connected to form a spherical joint. Two adjacent lead stops in the spherical joint can slip slightly. The lead stop group achieves bending conformity through the relative sliding of multiple spherical joints.

3. A novel post-loading source applicator for rectal cavity according to claim 1, characterized in that: The pressure block of the tail sealing device can be embedded in the groove at the opening of the flexible polyurethane shell. The pressure cover and the positioning sleeve are fixedly connected by threads, and the pressure block is fixed at the same time. The pressure block can limit the longitudinal displacement of the unit combined lead stop group.

4. A novel post-loading source applicator for rectal cavity according to claim 1, characterized in that: The number of guide support rings is 10; the number of radiation source channels is 4.

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