Rear-mounted precise positioning device for brachytherapy

Abstract

The invention discloses a back-mounted brachytherapy precise positioning device, which is characterized by comprising a catheter, a positioning device and a positioning device, the first source applicator comprises a first main body part, a first slot part, a first insertion part, a first air bag and a plurality of first elastic films; the second source applicator comprises a second main body part, a second slot part, a second insertion part, a second air bag and a plurality of second elastic films; wherein the back-mounted precise positioning device for brachytherapy is configured as follows: in a working state, a first opposite surface and a second opposite surface clamp and fix a catheter, a first insertion part is inserted into a second slot part and extrudes a second air bag, and a second elastic film deforms and protrudes out of a second peripheral surface; the second insertion part is inserted into the first slot part and extrudes the first air bag, and the first elastic film deforms and protrudes out of the first circumferential surface.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a precise positioning device for afterloading brachytherapy. Background Art

[0002] The precise positioning device for afterloading brachytherapy is used for the precise radiotherapy of solid tumors such as gynecological diseases (such as cervical cancer, endometrial cancer), prostate cancer, etc. Through an image guidance and mechanical positioning system, it ensures that the radiation source (such as iridium-192) accurately reaches the lesion area, while avoiding healthy tissues, so as to achieve high-dose target area irradiation and protection of surrounding organs.

[0003] In related technologies, because it is necessary to ensure the position accuracy of the radiation source, the fixation of the catheter for releasing the radiation source is very important. It is necessary to keep the patient fixed and the catheter fixed in order to improve the accuracy of the radiation source, eradicate the lesion, and avoid damage to healthy tissues. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a precise positioning device for afterloading brachytherapy, which can improve the treatment effect.

[0005] According to an embodiment of the present invention, the precise positioning device for afterloading brachytherapy includes: A catheter; A first source applicator, including a first main body portion, a first slot portion, a first insertion portion, a first airbag, and a plurality of first elastic membranes. The first main body portion has a first opposite surface, a first circumferential surface, and a first air passage. The first slot portion and the first insertion portion are both provided on the first opposite surface. The first circumferential surface has a plurality of first air holes, and each first elastic membrane covers one of the first air holes. The first airbag is provided inside the first slot portion and is communicated with the first air holes through the first air passage; A second source applicator, including a second main body portion, a second slot portion, a second insertion portion, a second airbag, and a plurality of second elastic membranes. The second main body portion has a second opposite surface, a second circumferential surface, and a second air passage. The second slot portion and the second insertion portion are both provided on the second opposite surface. The second circumferential surface has a plurality of second air holes, and each second elastic membrane covers one of the second air holes. The second airbag is provided inside the second slot portion and is communicated with the second air holes through the second air passage; Wherein, the afterloading brachytherapy precise positioning device is configured such that in the working state, the first opposing surface and the second opposing surface clamp and fix the catheter, the first insertion portion is inserted into the second slot portion and presses the second airbag, and the second elastic membrane deforms and protrudes from the second circumferential surface; the second insertion portion is inserted into the first slot portion and presses the first airbag, and the first elastic membrane deforms and protrudes from the first circumferential surface.

[0006] The afterloading brachytherapy precise positioning device according to an embodiment of the present invention has at least the following beneficial effects: 1. During treatment, first, the catheter is inserted into the lesion location. Then, the first applicator is inserted along the catheter near the lesion. Next, the second applicator is inserted along the other side of the catheter near the lesion. The first insertion portion of the first applicator is engaged with the second slot portion of the second applicator, and the first slot portion of the first applicator is engaged with the second insertion portion of the second applicator, realizing the mutual fixation of the first applicator and the second applicator and clamping the catheter together to fix the catheter.

[0007] 2. During the assembly of the first applicator and the second applicator, both the first airbag and the second airbag are squeezed, resulting in an increase in the air pressure in the first airbag, the first air passage, and the first air hole. Under the action of the pressure, the first elastic membrane extrudes towards the first circumferential surface, causing the first elastic membrane to form an elastic protrusion on the first circumferential surface, thereby increasing the stability of the first applicator in the human body. The second elastic membrane also forms an elastic protrusion on the second circumferential surface, thereby increasing the stability of the second applicator in the human body, making the first applicator and the second applicator more stable in the human body, thus better fixing the catheter, making the position accuracy of the catheter higher, and when the radiation source passes through the catheter, the position accuracy of the radiation source is also higher, and the treatment effect is better.

[0008] According to some embodiments of the present invention, the first opposing surface has a first clamping cavity, and the first applicator further includes a first fixed airbag provided on the inner circumferential surface of the first clamping cavity. The first fixed airbag is communicated with the first airbag through the first air passage. The second opposing surface has a second clamping cavity, and the second applicator further includes a second fixed airbag provided on the inner circumferential surface of the second clamping cavity. The second fixed airbag is communicated with the second airbag through the second air passage; Wherein, the afterloading brachytherapy precise positioning device is configured such that in the working state, the first clamping cavity and the second clamping cavity jointly clamp the catheter, and the first fixed airbag expands between the inner circumferential surface of the first clamping cavity and the outer circumferential surface of the catheter to fix the catheter; the second fixed airbag expands between the inner circumferential surface of the second clamping cavity and the outer circumferential surface of the catheter to fix the catheter.

[0009] According to some embodiments of the present invention, the catheter includes a main tube portion and an anti-rotation portion provided on the outer peripheral surface of the main tube portion. At least a part of the first clamping cavity is fitted into a part of the anti-rotation portion, and at least a part of the second clamping cavity is fitted into another part of the anti-rotation portion to fix and limit the rotation of the catheter.

[0010] According to some embodiments of the present invention, the anti-rotation portion further includes a first limiting groove and a second limiting groove. The first applicator further includes a first limiting protrusion provided in the first clamping cavity, and the second applicator further includes a second limiting protrusion provided in the second clamping cavity. Wherein, the afterloading brachytherapy precise positioning device is configured such that in the working state, the first limiting protrusion is clamped within the first limiting groove, and the second limiting protrusion is clamped within the second limiting groove.

[0011] According to some embodiments of the present invention, the first clamping cavity and the second clamping cavity enclose a conical total clamping cavity.

[0012] According to some embodiments of the present invention, all the first air holes are evenly spaced along the circumferential direction of the first circumferential surface.

[0013] According to some embodiments of the present invention, the diameter of the first air passage is L, and L ≤ 3 mm.

[0014] According to some embodiments of the present invention, the first insertion portion includes a first insertion main body portion and a first insertion protrusion provided on the outer peripheral surface of the first insertion main body portion. The first slot portion includes a first slot main body portion and a first insertion groove provided on the outer peripheral surface of the first slot main body portion. Wherein, the afterloading brachytherapy precise positioning device is configured such that in the working state, the first insertion protrusion is clamped with the first insertion groove.

[0015] According to some embodiments of the present invention, the first applicator further includes a first rod portion, and one end of the first rod portion is connected to the first main body portion.

[0016] According to some embodiments of the present invention, the first insertion portion and the first slot portion are arranged in a radial dislocation along the catheter. The first insertion portion has a first insertion end, and the first slot portion has a first slot opening. The first insertion end and the first slot opening face the same end.

[0017] According to some embodiments of the present invention, the first insertion portion includes a first insertion main body portion and a first connecting portion. The first insertion main body portion is spaced apart from the first main body portion, and the first connecting portion is connected between the first insertion main body portion and the first main body portion.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0019] The present invention will be further described below in conjunction with the drawings and embodiments, where: Figure 1 is a schematic structural diagram of a post-implantation brachytherapy precise positioning device according to an embodiment of the present invention; Figure 2 is an exploded structural diagram of a post-implantation brachytherapy precise positioning device according to an embodiment of the present invention; Figure 3 is a front view schematic diagram of a post-implantation brachytherapy precise positioning device according to an embodiment of the present invention; Figure 4 is a cross-sectional schematic diagram of a post-implantation brachytherapy precise positioning device according to an embodiment of the present invention from a first perspective; Figure 5 is Figure 4 a partial enlarged view of part A in Figure 6 is a cross-sectional schematic diagram of a post-implantation brachytherapy precise positioning device according to an embodiment of the present invention from a second perspective; Figure 7 is Figure 6 a partial enlarged view of part B in Figure 8 is a cross-sectional schematic diagram of a post-implantation brachytherapy precise positioning device according to an embodiment of the present invention from a third perspective.

[0020] Reference Signs in the Drawings: Catheter 100; Main Tube Portion 110; Anti-rotation Portion 120; First Limit Groove 121; Second Limit Groove 122; First Applicator 200; First Clamping Cavity 201; First Anti-rotation Cavity 2011; First Semi-conical Cavity 2012; First Main Body Portion 210; First Opposite Surface 211; First Peripheral Surface 212; First Gas Path 213; First Slot Portion 220; First Slot Main Body Portion 221; First Insertion Groove 222; First Insertion Portion 230; First Insertion Main Body Portion 231; First Insertion Projection 232; First Elastic Membrane 240; First Fixed Airbag 250; First Limit Projection 260; First Rod Portion 270; Second Applicator 300; Second Main Body Portion 310; Second Slot Portion 320; Second Insertion Portion 330. Detailed implementation manners

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention.

[0022] In the description of the present invention, it should be understood that for the orientation description, such as up, down, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] In the description of the present invention, several means one and more than one, and a plurality means two and more than two. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0025] The catheter in the afterloading brachytherapy precise positioning device mainly serves to carry the radiation source. Driven by the main body, the radiation source can move to a specified position in the catheter and stay there to treat the lesion of the patient without damaging healthy tissues. Because the treatment range of the radiation source is limited, if the position of the radiation source deviates, the treatment range of the radiation source will change, resulting in the situation that the lesion is not eradicated and the healthy tissues are damaged at the same time. Therefore, the position accuracy of the radiation source is very important.

[0026] The position accuracy of the radiation source is closely related to the position accuracy of the catheter in the human body. The catheter is generally assisted to be fixed in the human body through the applicator. The volume of the applicator is larger than that of the catheter, resulting in certain difficulties for the applicator to enter the human body. Therefore, the outer peripheral surface of the applicator generally needs to be kept smooth for easy entry. However, after the applicator enters the human body, it is necessary to keep itself fixed, and the smooth outer peripheral surface of the applicator will become an obstacle to the fixation of the applicator, making it difficult for the applicator to be stably fixed in the human body.

[0027] Refer to Figures 1 to 8As shown in the figure, a precise positioning device for afterloading brachytherapy according to an embodiment of the present invention includes a catheter 100, a first applicator 200, and a second applicator 300.

[0028] The catheter 100 is a hollow tube, which is connected to an external host. The host is used to apply a radiation source to a predetermined position of the catheter 100, so that the radiation source can accurately strike the lesion without damaging healthy tissues.

[0029] The first applicator 200 includes a first main body portion 210, a first slot portion 220, a first insertion portion 230, a first airbag (not shown in the figure), and a plurality of first elastic membranes 240. The first main body portion 210 has a first opposite surface 211, a first peripheral surface 212, and a first air passage 213. The first slot portion 220 and the first insertion portion 230 are both provided on the first opposite surface 211. The first peripheral surface 212 has a plurality of first air holes, and each first elastic membrane 240 covers a first air hole. The first airbag is disposed within the first slot portion 220 and communicates with the first air holes through the first air passage 213.

[0030] In this embodiment, the first applicator 200 is in a semi-cylindrical, semi-spherical, or semi-elliptical spherical shape. The first main body portion 210 includes a first opposite surface 211 and a first peripheral surface 212. The first opposite surface 211 can be regarded as a plane or a plurality of planes with different heights. The first opposite surface 211 is the cut surface of a semi-circular or semi-elliptical shape, and the first peripheral surface 212 is the arc surface of a semi-circular or semi-elliptical shape. Through the guidance of the arc surface, the first applicator 200 is more easily inserted into the human body, facilitating the operation of medical staff. Among them, the first arc surface is a smooth curved surface. The first air passage 213 is disposed within the first main body portion 210 to communicate the first airbag and the first air holes.

[0031] The first slot portion 220 includes a rectangular slot or a tapered slot. The first airbag is disposed within the first slot portion 220. One end of the first air passage 213 communicates with the bottom of the first slot portion 220 and is connected to the first airbag at the bottom of the slot. The slot wall and the bottom wall of the first slot portion 220 can both limit the first airbag. When the first airbag is subjected to pressure towards the bottom of the slot, the first airbag is compressed and deformed, increasing the air pressure in the first air passage 213 and the first air holes. The first elastic membrane 240 is elastically deformed under pressure and protrudes from the first peripheral surface 212, realizing the fixation of the first applicator 200 in the human body.

[0032] The first insertion part 230 includes a rectangular plate or a conical plate. The first insertion part 230 includes a first insertion main body part 231 and a first connection part. The first insertion main body part 231 is spaced apart from the first main body part 210. The first connection part is connected between the first insertion main body part 231 and the first main body part 210. Among them, one end of the first insertion main body part 231 away from the first connection part is the first insertion end.

[0033] The second applicator 300 includes a second main body part 310, a second slot part 320, a second insertion part 330, a second airbag (not shown in the figure), and a plurality of second elastic membranes. The second main body part 310 has a second opposite surface, a second peripheral surface, and a second air passage. The second slot part 320 and the second insertion part 330 are both provided on the second opposite surface. The second peripheral surface has a plurality of second air holes. Each second elastic membrane covers a second air hole. The second airbag is provided within the second slot part 320 and is communicated with the second air holes through the second air passage.

[0034] The shape of the second slot part 320 is adapted to the shape of the first insertion part 230, and the second slot part 320 can be inserted by the first insertion part 230. After the first insertion part 230 is inserted into the second slot part 320, the first insertion part 230 and the second slot part 320 are clamped by friction, so that the first insertion part 230 can be kept inserted within the second slot part 320 to squeeze the second airbag within the second slot part 320, and at the same time keep the first applicator 200 and the second applicator 300 fixed.

[0035] The shape of the second insertion part 330 is adapted to the shape of the first slot part 220. The second insertion part 330 is inserted into the first slot part 220. After insertion, the second insertion part 330 and the first slot part 220 are clamped by friction. The second insertion part 330 squeezes the first airbag within the first slot part 220, so that the second insertion part 330 and the first slot part 220 are kept fixed, and at the same time keep the first applicator 200 and the second applicator 300 fixed.

[0036] Among them, the afterloading brachytherapy precise positioning device is configured as follows: in the working state, the first opposite surface 211 and the second opposite surface clamp and fix the catheter 100. The first insertion part 230 is inserted into the second slot part 320 and squeezes the second airbag. The second elastic membrane deforms and protrudes from the second peripheral surface. The second insertion part 330 is inserted into the first slot part 220 and squeezes the first airbag. The first elastic membrane 240 deforms and protrudes from the first peripheral surface 212.

[0037] It should be understood that during the treatment, first, the catheter 100 is inserted into the lesion location. Then, the first applicator 200 is inserted along the catheter 100 near the lesion. Next, the second applicator 300 is inserted along the other side of the catheter 100 near the lesion. The first insertion part 230 of the first applicator 200 is engaged with the second slot part 320 of the second applicator 300, and the first slot part 220 of the first applicator 200 is engaged with the second insertion part 330 of the second applicator 300, realizing the mutual fixation of the first applicator 200 and the second applicator 300, and clamping the catheter 100 together to fix the catheter 100. During the assembly of the first applicator 200 and the second applicator 300, both the first airbag and the second airbag are squeezed, resulting in an increase in the air pressure in the first airbag, the first air passage 213, and the first air hole. Under the action of the pressure, the first elastic membrane 240 is extruded towards the first peripheral surface 212, causing the first elastic membrane 240 to form an elastic protrusion on the first peripheral surface 212, thereby increasing the stability of the first applicator 200 in the human body. The second elastic membrane also forms an elastic protrusion on the second peripheral surface, thereby increasing the stability of the second applicator 300 in the human body, making the first applicator 200 and the second applicator 300 more stable in the human body, thus better fixing the catheter 100, making the position accuracy of the catheter 100 higher, and when the radiation source passes through the catheter 100, the position accuracy of the radiation source is also higher, and the treatment effect is better.

[0038] Referring to Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in some specific embodiments of the present invention, the first relative surface 211 has a first clamping cavity 201. The first applicator 200 further includes a first fixed airbag 250 provided on the inner peripheral surface of the first clamping cavity 201. The first fixed airbag 250 is communicated with the first airbag through the first air passage 213. The second relative surface has a second clamping cavity. The second applicator 300 further includes a second fixed airbag provided on the inner peripheral surface of the second clamping cavity. The second fixed airbag is communicated with the second airbag through a second air passage; wherein, the afterloading brachytherapy precise positioning device is configured to: in the working state, the first clamping cavity 201 and the second clamping cavity jointly clamp the catheter 100, and the first fixed airbag 250 expands between the inner peripheral surface of the first clamping cavity 201 and the outer peripheral surface of the catheter 100 to fix the catheter 100; the second fixed airbag expands between the inner peripheral surface of the second clamping cavity and the outer peripheral surface of the catheter 100 to fix the catheter 100.

[0039] It should be understood that by fixing the catheter 100 once through the first clamping cavity 201 and the second clamping cavity, the catheter 100 is not easily shaken in the human body, the stability of the catheter 100 is improved, and thus the treatment effect of the radiation source is improved.

[0040] It should be noted that when the first clamping cavity 201 and the second clamping cavity fix the catheter 100, since the first applicator 200 and the second applicator 300 fix the catheter 100 through assembly, considering the convenience of assembling the first applicator 200 and the second applicator 300, it is difficult for the first applicator 200 and the second applicator 300 to have an interference fit with the catheter 100 directly. The interference fit will increase the installation difficulty of the first applicator 200 and the second applicator 300, while the transition fit and the clearance fit will cause gaps between the first applicator 200, the second applicator 300 and the catheter 100. Even if the first applicator 200 and the second applicator 300 clamp the catheter 100 together, the catheter 100 can still shake, resulting in a reduction in the position accuracy of the catheter 100 itself.

[0041] In this embodiment, by adding the first fixing airbag 250 and the second fixing airbag, when the first applicator 200 and the second applicator 300 are about to be assembled completely, the first fixing airbag 250 will fill the gap between the first clamping cavity 201 and the catheter 100, and the second fixing airbag will fill the gap between the second clamping cavity and the catheter 100, so that the catheter 100 is completely fixed by the first clamping cavity 201, the first fixing airbag 250, the second clamping cavity and the second fixing airbag, thereby improving the connection precision of the first applicator 200, the second applicator 300 and the catheter 100, making the fixing effect of the first applicator 200 and the second applicator 300 on the catheter 100 better, the catheter 100 more stable, and the treatment effect better.

[0042] Furthermore, the catheter 100 includes a main tube portion 110 and an anti-rotation portion 120 provided on the outer peripheral surface of the main tube portion 110. At least a part of the first clamping cavity 201 is fitted into a part of the anti-rotation portion 120, and at least a part of the second clamping cavity is fitted into another part of the anti-rotation portion 120 to fix and limit the rotation of the catheter 100.

[0043] In this embodiment, the first clamping cavity 201 includes a first anti-rotation cavity 2011 and a first semi-conical cavity 2012. The first anti-rotation cavity 2011 communicates with the first semi-conical cavity 2012. The small end of the first semi-conical cavity 2012 can be attached to the outer peripheral surface of the catheter 100. The large end of the first semi-conical cavity 2012 is more convenient for guiding the small end to be attached to the outer peripheral surface of the catheter 100, so that the first applicator 200 can move along the outer peripheral surface of the catheter 100 through the first semi-conical cavity 2012. The first anti-rotation cavity 2011 is fitted within a part of the anti-rotation portion 120 to restrict the catheter 100 from rotating circumferentially. The second clamping cavity includes a second anti-rotation cavity and a second semi-conical cavity. The second anti-rotation cavity communicates with the second semi-conical cavity. The small end of the second semi-conical cavity can be attached to the outer peripheral surface of the catheter 100. The large end of the second semi-conical cavity is more convenient for guiding the small end to be attached to the outer peripheral surface of the catheter 100, so that the second applicator 300 can move along the outer peripheral surface of the catheter 100 through the second semi-conical cavity. The second anti-rotation cavity is fitted within a part of the anti-rotation portion 120 to restrict the catheter 100 from rotating circumferentially.

[0044] Wherein, the first clamping cavity 201 and the second clamping cavity enclose a conical total clamping cavity. The shape of the total clamping cavity is more convenient for the cooperation between the catheter 100, the first applicator 200 and the second applicator 300. There are bending positions on the catheter 100 itself. The first applicator 200 can move along the bent part of the catheter 100 through the small end of the first semi-conical groove, avoiding getting stuck at the complete position of the catheter 100, improving the installation convenience of the first applicator 200. Similarly, the installation convenience of the second applicator 300 is also improved.

[0045] Furthermore, the anti-rotation portion 120 further includes a first limiting groove 121 and a second limiting groove 122. The first applicator 200 further includes a first limiting protrusion 260 provided in the first clamping cavity 201. The second applicator 300 further includes a second limiting protrusion provided in the second clamping cavity. Among them, the afterloading brachytherapy precise positioning device is configured that in the working state, the first limiting protrusion 260 is clamped within the first limiting groove 121, and the second limiting protrusion is clamped within the second limiting groove 122.

[0046] It should be understood that through the cooperation between the first limiting groove 121 and the first limiting protrusion 260, and the cooperation between the second limiting groove 122 and the second limiting protrusion, the first applicator 200 and the second applicator 300 are prevented from rotating with the catheter 100, so that the first applicator 200 and the second applicator 300 can fix the catheter 100, improving the fixing reliability of the catheter 100.

[0047] Among them, the rotation prevention part 120 is in a "mountain" shape. The depression on the left side of the "mountain" shape of the rotation prevention part 120 is the first limiting groove 121, and the depression on the right side of the "mountain" shape is the second limiting groove 122. The first rotation prevention cavity 2011 is fitted into half of the rotation prevention part 120, and the second rotation prevention cavity is fitted into the other half of the rotation prevention part 120.

[0048] Referring Figure 1 As shown, in some specific embodiments of the present invention, all the first air holes are evenly spaced along the circumferential direction of the first circumferential surface 212. It is understood that the uniform distribution of the first air holes along the first circumferential surface 212 makes the protrusions formed by the first elastic membrane 240 evenly distributed, and further makes the first circumferential surface 212 of the first applicator 200 evenly stressed, avoiding the first applicator 200 deviating from the preset position.

[0049] Among them, all the second air holes are also evenly spaced along the circumferential direction of the second circumferential surface.

[0050] In some specific embodiments of the present invention, the diameter of the first air passage 213 is L, and L≤3mm. It is understood that the total amount of gas in the first airbag and the first air passage 213 is fixed. When the first airbag is compressed, the gas pressure increases, and then the first elastic membrane 240 is bulged out. The deformation of the first elastic membrane 240 requires a large pressure value. The smaller the diameter of the first air passage 213 is made, the less gas content in the first air passage 213. When the volume of the first airbag decreases, the overall pressure value in the first airbag and the first air passage 213 is larger, making the deformation effect of the first elastic membrane 240 better.

[0051] Among them, the diameter of the second air passage is X, and X≤3mm.

[0052] Referring Figure 2 、 Figure 4 And Figure 8 As shown, in some specific embodiments of the present invention, the first insertion part 230 includes a first insertion main body part 231 and a first insertion protrusion 232 provided on the outer circumferential surface of the first insertion main body part 231. The first slot part 220 includes a first slot main body part 221 and a first insertion groove 222 provided on the outer circumferential surface of the first slot main body part 221; among them, the afterloading brachytherapy precise positioning device is configured to: in the working state, the first insertion protrusion 232 is clamped with the first insertion groove 222.

[0053] It should be understood that through the engagement of the first insertion protrusion 232 and the first insertion groove 222, when the medical staff operates the first applicator 200 and the second applicator 300 in cooperation, they can feel the vibration. When the first insertion protrusion 232 is engaged with the first insertion groove 222 in place, the medical staff can know that the first applicator 200 and the second applicator 300 are installed in place, which is convenient for the medical staff to operate. At the same time, the engagement of the first insertion protrusion 232 and the first insertion groove 222 can increase the connection reliability between the first applicator 200 and the second applicator 300.

[0054] Referring to Figure 1 As shown, in some specific embodiments of the present invention, the first applicator 200 further includes a first rod portion 270, and one end of the first rod portion 270 is connected to the first main body portion 210. It should be understood that by connecting the first main body portion 210 through the first rod portion 270, the medical staff can control the first applicator 200 to extend into the human body through the first rod portion 270, which is convenient for the medical staff to operate.

[0055] Referring to Figure 1 、 Figure 2 and Figure 3 As shown, in some specific embodiments of the present invention, the first insertion portion 230 and the first slot portion 220 are arranged offset in the radial direction of the catheter 100. The first insertion portion 230 has a first insertion end, and the first slot portion 220 has a first slot opening. The first insertion end and the first slot opening face the same end.

[0056] It should be understood that the first slot opening and the first insertion end face the same end, which is convenient for the second insertion portion 330 and the second slot portion 320 in the second applicator 300 to be inserted into the first slot opening and the first insertion end of the first applicator 200 in the same direction. The installation and cooperation of the first applicator 200 and the second applicator 300 are more convenient, and it is more convenient for the medical staff to operate.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A precise positioning device for afterloading brachytherapy, characterized in that, Comprising: A catheter; A first applicator, including a first main body portion, a first slot portion, a first insertion portion, a first airbag, and a plurality of first elastic membranes. The first main body portion has a first opposite surface, a first peripheral surface, and a first air passage. The first slot portion and the first insertion portion are both provided on the first opposite surface. The first peripheral surface has a plurality of first air holes, and each of the first elastic membranes covers one of the first air holes. The first airbag is provided inside the first slot portion and is communicated with the first air holes through the first air passage; A second applicator, including a second main body portion, a second slot portion, a second insertion portion, a second airbag, and a plurality of second elastic membranes. The second main body portion has a second opposite surface, a second peripheral surface, and a second air passage. The second slot portion and the second insertion portion are both provided on the second opposite surface. The second peripheral surface has a plurality of second air holes, and each of the second elastic membranes covers one of the second air holes. The second airbag is provided inside the second slot portion and is communicated with the second air holes through the second air passage; Wherein, the afterloading brachytherapy precise positioning device is configured such that: in the working state, the first opposite surface and the second opposite surface clamp and fix the catheter, the first insertion portion is inserted into the second slot portion and squeezes the second airbag, and the second elastic membrane deforms and protrudes from the second peripheral surface; the second insertion portion is inserted into the first slot portion and squeezes the first airbag, and the first elastic membrane deforms and protrudes from the first peripheral surface.

2. The afterloading brachytherapy precise positioning device according to claim 1, wherein: The first opposite surface has a first clamping cavity, and the first applicator further includes a first fixing airbag provided on the inner peripheral surface of the first clamping cavity. The first fixing airbag is communicated with the first airbag through the first air passage. The second opposite surface has a second clamping cavity, and the second applicator further includes a second fixing airbag provided on the inner peripheral surface of the second clamping cavity. The second fixing airbag is communicated with the second airbag through the second air passage; Wherein, the afterloading brachytherapy precise positioning device is configured such that: in the working state, the first clamping cavity and the second clamping cavity jointly clamp the catheter, and the first fixing airbag expands between the inner peripheral surface of the first clamping cavity and the outer peripheral surface of the catheter to fix the catheter; the second fixing airbag expands between the inner peripheral surface of the second clamping cavity and the outer peripheral surface of the catheter to fix the catheter.

3. The afterloading brachytherapy precise positioning device according to claim 2, wherein: The catheter includes a main tube portion and an anti-rotation portion provided on the outer peripheral surface of the main tube portion. At least a part of the first clamping cavity is fitted to a part of the anti-rotation portion, and at least a part of the second clamping cavity is fitted to another part of the anti-rotation portion to fix and limit the rotation of the catheter.

4. The afterloading brachytherapy precise positioning device according to claim 3, wherein: The anti-rotation portion further includes a first limiting groove and a second limiting groove. The first applicator further includes a first limiting protrusion provided in the first clamping cavity, and the second applicator further includes a second limiting protrusion provided in the second clamping cavity; Wherein, the afterloading brachytherapy precise positioning device is configured such that: in the working state, the first limiting protrusion is clamped inside the first limiting groove, and the second limiting protrusion is clamped inside the second limiting groove.

5. The afterloading brachytherapy precise positioning device according to claim 2, wherein: The first clamping cavity and the second clamping cavity enclose a conical total clamping cavity.

6. The afterloading brachytherapy precise positioning device according to claim 1, wherein: All the first air holes are evenly spaced along the circumferential direction of the first circumferential surface.

7. The afterloading brachytherapy precise positioning device according to claim 1, characterized in that: The diameter of the first air passage is L, where L ≤ 3 mm.

8. The afterloading brachytherapy precise positioning device according to claim 1, wherein: The first insertion portion includes a first insertion main body portion and a first insertion protrusion provided on the outer circumferential surface of the first insertion main body portion, and the first slot portion includes a first slot main body portion and a first insertion groove provided on the outer circumferential surface of the first slot main body portion; Wherein, the afterloading brachytherapy precise positioning device is configured such that in the working state, the first insertion protrusion is snap-fitted with the first insertion groove.

9. The afterloading brachytherapy precise positioning device according to claim 1, characterized in that: The first insertion portion and the first slot portion are arranged offset in the radial direction of the catheter. The first insertion portion has a first insertion end, and the first slot portion has a first slot opening. The first insertion end and the first slot opening face the same end.

10. The afterloading brachytherapy precise positioning device according to claim 1, characterized in that: The first insertion portion includes a first insertion main body portion and a first connecting portion. The first insertion main body portion is spaced apart from the first main body portion, and the first connecting portion is connected between the first insertion main body portion and the first main body portion.

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