Afterloading brachytherapy precision positioning device

Abstract

The application discloses a kind of afterloading brachytherapy precision positioning device, it is characterized in that, including: catheter;First source applicator includes first main part, first slot part, first insertion part, first air bag and multiple first elastic film;Second source applicator includes second main part, second slot part, second insertion part, second air bag and multiple second elastic film;Wherein, afterloading brachytherapy precision positioning device is configured as: in working condition, first opposite surface and second opposite surface hold fixed catheter, first insertion part inserts second slot part and extrudes second air bag, second elastic film is deformed and protrudes on second circumferential surface;Second insertion part inserts first slot part and extrudes first air bag, first elastic film is deformed and protrudes on first circumferential surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a precise positioning device for afterloading brachytherapy. BACKGROUND

[0002] The precise positioning device for afterloading brachytherapy is used for precise radiotherapy of gynecological (such as cervical cancer, endometrial cancer), prostate cancer and other solid tumors. Through an image-guided and mechanical positioning system, the radioactive source (such as iridium-192) can accurately reach the lesion area while avoiding healthy tissues, thereby achieving high-dose target area irradiation and protection of surrounding organs.

[0003] In the related art, since the position accuracy of the radioactive source needs to be ensured, the fixation of the catheter for releasing the radioactive source is very important. The patient needs to be fixed, and the catheter also needs to be fixed, so as to improve the accuracy of the radioactive source, eradicate the lesion, and avoid damage to healthy tissues. SUMMARY

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

[0005] The precise positioning device for afterloading brachytherapy according to the embodiments of the present application comprises:

[0006] a catheter;

[0007] a first applicator comprising a first main body portion, a first slot portion, a first insertion portion, a first air bag, and a plurality of first elastic membranes, the first main body portion having a first opposite surface, a first peripheral surface, and a first air channel, the first slot portion and the first insertion portion being provided on the first opposite surface, the first peripheral surface having a plurality of first air holes, each of the first elastic membranes being provided on one of the first air holes, the first air bag being provided in the first slot portion and being connected to the first air holes through the first air channel;

[0008] a second applicator comprising a second main body portion, a second slot portion, a second insertion portion, a second air bag, and a plurality of second elastic membranes, the second main body portion having a second opposite surface, a second peripheral surface, and a second air channel, the second slot portion and the second insertion portion being provided on the second opposite surface, the second peripheral surface having a plurality of second air holes, each of the second elastic membranes being provided on one of the second air holes, the second air bag being provided in the second slot portion and being connected to the second air holes through the second air channel;

[0009] In the working state, the first relative surface and the second relative surface hold the catheter, the first insertion part inserts the second slot part and presses the second air bag, the second elastic membrane deforms and protrudes from the second peripheral surface, and the second insertion part inserts the first slot part and presses the first air bag, and the first elastic membrane deforms and protrudes from the first peripheral surface.

[0010] The afterloading brachytherapy precision positioning device has at least the following beneficial effects:

[0011] 1. During treatment, the catheter is first inserted into the lesion position, then the first applicator is inserted into the vicinity of the lesion along the catheter, and then the second applicator is inserted into the vicinity of the lesion along the other side of the catheter, the first insertion part of the first applicator and the second slot part of the second applicator are clamped with each other, the first slot part of the first applicator and the second insertion part of the second applicator are clamped with each other, the mutual fixation of the first applicator and the second applicator is realized, and the catheter is clamped together to realize the fixation of the catheter.

[0012] 2. During the assembly of the first applicator and the second applicator, the first air bag and the second air bag are pressed, so that the air pressure in the first air bag, the first air path and the first air hole is increased, the first elastic membrane is extruded to the first peripheral surface under the action of the pressure, so that the first elastic membrane forms an elastic protrusion on the first peripheral 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 peripheral surface, thereby increasing the stability of the second applicator in the human body, so that the first applicator and the second applicator are more stable in the human body, thereby better fixing the catheter, so that the position accuracy of the catheter is higher, and the position accuracy of the radioactive source is higher when the radioactive source passes through the catheter, and the treatment effect is better.

[0013] According to some embodiments of the present application, the first relative surface has a first clamping cavity, the first applicator further comprises a first fixed air bag arranged on the inner peripheral surface of the first clamping cavity, the first fixed air bag is communicated with the first air bag through the first air path, the second relative surface has a second clamping cavity, and the second applicator further comprises a second fixed air bag arranged on the inner peripheral surface of the second clamping cavity, the second fixed air bag is communicated with the second air bag through the second air path.

[0014] In the working state, the first clamping cavity and the second clamping cavity hold the catheter together, the first fixed air bag is inflated between the inner peripheral surface of the first clamping cavity and the outer peripheral surface of the catheter to fix the catheter, and the second fixed air bag is inflated between the inner peripheral surface of the second clamping cavity and the outer peripheral surface of the catheter to fix the catheter.

[0015] According to some embodiments of the present application, the catheter comprises a main tube portion and a rotation-stopping portion arranged on the outer circumferential surface of the main tube portion, at least part of the first clamping cavity is embedded in part of the rotation-stopping portion, and at least part of the second clamping cavity is embedded in another part of the rotation-stopping portion, so as to fix and limit the rotation of the catheter.

[0016] According to some embodiments of the present application, the rotation-stopping portion further comprises a first limiting groove and a second limiting groove, the first applicator further comprises a first limiting protrusion arranged in the first clamping cavity, and the second applicator further comprises a second limiting protrusion arranged in the second clamping cavity.

[0017] In the working state, the first limiting protrusion is clamped in the first limiting groove, and the second limiting protrusion is clamped in the second limiting groove.

[0018] According to some embodiments of the present application, the first clamping cavity and the second clamping cavity jointly form a conical total clamping cavity.

[0019] According to some embodiments of the present application, all the first air holes are uniformly and spacedly distributed along the circumferential direction of the first circumferential surface.

[0020] According to some embodiments of the present application, the diameter of the first air path is L, and L≤3mm.

[0021] According to some embodiments of the present application, the first insertion portion comprises a first insertion main body portion and a first insertion protrusion arranged on the outer circumferential surface of the first insertion main body portion, and the first insertion slot portion comprises a first insertion slot main body portion and a first insertion recess arranged on the outer circumferential surface of the first insertion slot main body portion.

[0022] In the working state, the first insertion protrusion is clamped in the first insertion recess.

[0023] According to some embodiments of the present application, the first applicator further comprises a first rod portion, one end of the first rod portion is connected to the first main body portion.

[0024] According to some embodiments of the present application, the first insertion portion and the first insertion slot portion are arranged in a radial direction of the catheter, the first insertion portion has a first insertion end, the first insertion slot portion has a first slot opening, and the first insertion end and the first slot opening are directed to the same end.

[0025] According to some embodiments of the present application, the first insertion portion comprises a first insertion main body portion and a first connecting portion, the first insertion main body portion is arranged in a spaced manner with 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.

[0026] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The application will be further described with reference to the drawings and examples, in which:

[0028] Figure 1 Structure diagram of the precise positioning device for afterloading brachytherapy of an embodiment of the application;

[0029] Figure 2 Structure diagram of the precise positioning device for afterloading brachytherapy of an embodiment of the application;

[0030] Figure 3 Front view diagram of the precise positioning device for afterloading brachytherapy of an embodiment of the application;

[0031] Figure 4 Section view diagram of the precise positioning device for afterloading brachytherapy of an embodiment of the application from a first perspective;

[0032] Figure 5 is a partial enlarged view of part A in the figure; Figure 4

[0033] Figure 6 Section view diagram of the precise positioning device for afterloading brachytherapy of an embodiment of the application from a second perspective;

[0034] Figure 7 is a partial enlarged view of part B in the figure; Figure 6

[0035] Figure 8 Section view diagram of the precise positioning device for afterloading brachytherapy of an embodiment of the application from a third perspective.

[0036] Reference signs:

[0037] Catheter 100; main pipe part 110; rotation-stopping part 120; first limiting slot 121; second limiting slot 122;

[0038] First source applicator 200; first clamping cavity 201; first rotation-stopping cavity 2011; first half-cone cavity 2012;

[0039] First main body part 210; first opposite face 211; first peripheral face 212; first air path 213;

[0040] First insertion slot part 220; first insertion slot main body part 221; first insertion recess 222;​​

[0041] The first insertion part 230; the first insertion body part 231; the first insertion protrusion 232;

[0042] The first elastic film 240;

[0043] The first fixed air bag 250;

[0044] The first limiting protrusion 260;

[0045] The first rod part 270;

[0046] The second applicator 300; the second body part 310; the second insertion part 330. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein the same or similar components have the same or similar designations throughout the several views. The embodiments described below are exemplary in nature, only for the purpose of explanation and are not to be construed as limiting the present application.

[0048] In the description of the present application, it should be understood that the orientation description, such as the upper, lower, etc. The orientation or positional relationship shown in the drawings is based on the orientation or positional relationship shown in the drawings, only for the purpose of describing the present application and simplifying the description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0049] In the description of the present application, several refers to one and more, and multiple refers to two and more. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.

[0050] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. Should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0051] The catheter in the afterloading brachytherapy precise positioning device mainly plays the role of carrying the radioactive source. Under the driving of the main body, the radioactive source can move to the designated position in the catheter and stay there to treat the patient's lesion while not damaging the healthy tissue. Because the treatment range of the radioactive source is limited, if the position of the radioactive source deviates, the treatment range of the radioactive source will change, and the lesion will not be eradicated, and the healthy tissue will be damaged. Therefore, the position accuracy of the radioactive source is very important.

[0052] The position accuracy of the radioactive source is closely related to the position accuracy of the catheter in the human body. The catheter is generally fixed in the human body by the applicator. The volume of the applicator is larger than that of the catheter, which causes certain difficulties in entering the human body. Therefore, the outer surface of the applicator generally needs to be smooth to facilitate entry. However, after the applicator enters the human body, it needs to be fixed. The smooth outer surface of the applicator will become an obstacle to the fixation of the applicator, making it difficult to stably fix in the human body.

[0053] Referring to Figures 1 to 8 An embodiment of the application is a precise positioning device for afterloading brachytherapy, which comprises a catheter 100, a first applicator 200, and a second applicator 300.

[0054] The catheter 100 is a hollow tube, and the catheter 100 is connected to an external host. The host is used to apply a radioactive source to a predetermined position of the catheter 100, so that the radioactive source can accurately attack the lesion and not damage healthy tissues.

[0055] The first applicator 200 comprises a first main body part 210, a first slot part 220, a first insertion part 230, a first air bag (not shown in the figure), and a plurality of first elastic membranes 240. The first main body part 210 has a first opposite surface 211, a first peripheral surface 212, and a first air path 213. The first slot part 220 and the first insertion part 230 are arranged on the first opposite surface 211. The first peripheral surface 212 has a plurality of first air holes. Each first elastic membrane 240 is arranged on a first air hole. The first air bag is arranged in the first slot part 220 and is connected to the first air hole through the first air path 213.

[0056] In this embodiment, the first applicator 200 is in the shape of a semi-cylinder, a semi-sphere, or a semi-elliptical sphere. The first main body part 210 comprises 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 a tangent surface of a semi-circle or a semi-ellipse. The first peripheral surface 212 is an arc surface of a semi-circle or a semi-ellipse. The arc surface guides the first applicator 200 to enter the human body more easily, which is convenient for medical staff to operate. The first arc surface is a smooth curved surface. The first air path 213 is arranged in the first main body part 210 to connect the first air bag and the first air hole.

[0057] The first slot part 220 comprises a rectangular slot or a tapered slot, a first air bag is arranged in the first slot part 220, one end of the first air path 213 is communicated with the bottom of the slot of the first slot part 220, and the bottom of the slot is communicated with the first air bag, the wall and the bottom wall of the slot of the first slot part 220 can limit the first air bag, so that when the first air bag is pressed to deform, the air pressure in the first air path 213 and the first air hole is increased, the first elastic film 240 is elastically deformed under pressure and protrudes from the first peripheral surface 212, thereby realizing the fixation of the first applicator 200 in the human body.

[0058] The first insertion part 230 comprises a rectangular plate or a tapered plate, and the first insertion part 230 comprises a first insertion main body part 231 and a first connecting part, the first insertion main body part 231 is arranged spaced apart from the first main body part 210, and the first connecting part is connected between the first insertion main body part 231 and the first main body part 210. Wherein, the end of the first insertion main body part 231 away from the first connecting part is a first insertion end.

[0059] The second applicator 300 comprises a second main body part 310, a second slot part 320, a second insertion part 330, a second air bag (not shown in the figure) and a plurality of second elastic films, the second main body part 310 has a second opposite surface, a second peripheral surface and a second air path, the second slot part 320 and the second insertion part 330 are arranged on the second opposite surface, the second peripheral surface has a plurality of second air holes, each second elastic film covers a second air hole, and the second air bag is arranged in the second slot part 320 and communicated with the second air hole through the second air path.

[0060] The shape of the second slot part 320 is matched with the shape of the first insertion part 230, and the second slot part 320 can be inserted into 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 into the second slot part 320 to press the second air bag in the second slot part 320, and at the same time, the first applicator 200 and the second applicator 300 are kept fixed.

[0061] The shape of the second insertion part 330 is matched with the shape of the first slot part 220, the second insertion part 330 is inserted into the first slot part 220, after the insertion, the second insertion part 330 and the first slot part 220 are clamped by friction, the second insertion part 330 presses the first air bag in 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, the first applicator 200 and the second applicator 300 are kept fixed.

[0062] The rear-loaded brachytherapy precise positioning device is configured to, in the working state, clamp and fix the catheter 100 by the first opposite surface 211 and the second opposite surface, the first insertion part 230 is inserted into the second insertion slot part 320 and extrudes the second air bag, the second elastic film is deformed and protrudes from the second peripheral surface, the second insertion part 330 is inserted into the first insertion slot part 220 and extrudes the first air bag, and the first elastic film 240 is deformed and protrudes from the first peripheral surface 212.

[0063] It is worth understanding that, when treatment is performed, the catheter 100 is first inserted into the lesion position, then the first applicator 200 is inserted into the vicinity of the lesion along the catheter 100, and then the second applicator 300 is inserted into the vicinity of the lesion along the other side of the catheter 100, the first insertion part 230 of the first applicator 200 and the second insertion slot part 320 of the second applicator 300 are clamped with each other, the first insertion slot part 220 of the first applicator 200 and the second insertion part 330 of the second applicator 300 are clamped with each other, the mutual fixation of the first applicator 200 and the second applicator 300 is realized, and the catheter 100 is clamped together to realize the fixation of the catheter 100. During the assembly of the first applicator 200 and the second applicator 300, the first air bag and the second air bag are extruded, so that the air pressure in the first air bag, the first air channel 213 and the first air hole is increased, the first elastic film 240 is extruded to the first peripheral surface 212 under the action of the pressure, so that the first elastic film 240 forms an elastic protrusion on the first peripheral surface 212, thereby increasing the stability of the first applicator 200 in the human body, and the second elastic film also forms an elastic protrusion on the second peripheral surface, thereby increasing the stability of the second applicator 300 in the human body, so that the first applicator 200 and the second applicator 300 are more stable in the human body, thereby better fixing the catheter 100, so that the position accuracy of the catheter 100 is higher, and the position accuracy of the radioactive source is higher when the radioactive source passes through the catheter 100, and the treatment effect is better.

[0064] Referring to Figure 2 , Figure 3 , Figure 6 and Figure 7As shown, in some embodiments of the present application, the first relative surface 211 has a first clamping cavity 201, and the first applicator 200 further comprises a first fixed air bag 250 arranged on the inner circumferential surface of the first clamping cavity 201, and the first fixed air bag 250 is communicated with the first air bag through a first air path 213. The second relative surface has a second clamping cavity, and the second applicator 300 further comprises a second fixed air bag arranged on the inner circumferential surface of the second clamping cavity, and the second fixed air bag is communicated with the second air bag through a second air path; wherein the rear-loaded 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, the first fixed air bag 250 is inflated between the inner circumferential surface of the first clamping cavity 201 and the outer circumferential surface of the catheter 100 to fix the catheter 100; and the second fixed air bag is inflated between the inner circumferential surface of the second clamping cavity and the outer circumferential surface of the catheter 100 to fix the catheter 100.

[0065] It is worth understanding that by fixing the catheter 100 through the first clamping cavity 201 and the second clamping cavity, the catheter 100 is less likely to shake in the human body, improving the stability of the catheter 100, and thus improving the treatment effect of the radioactive source.

[0066] It should be noted that when the first clamping cavity 201 and the second clamping cavity fix the catheter 100, because the first applicator 200 and the second applicator 300 fix the catheter 100 by assembly, considering the convenience of assembly of the first applicator 200 and the second applicator 300, the first applicator 200 and the second applicator 300 are difficult to be directly interference fitted with the catheter 100. Interference fit will increase the installation difficulty of the first applicator 200 and the second applicator 300, and transition fit and gap 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, reducing the positional accuracy of the catheter 100 itself.

[0067] In this embodiment, by increasing the first fixed air bag 250 and the second fixed air bag, when the first applicator 200 and the second applicator 300 are about to be assembled completely, the first fixed air bag 250 will fill the gap between the first clamping cavity 201 and the catheter 100, and the second fixed air bag 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 fixed air bag 250, the second clamping cavity and the second fixed air bag, thereby improving the connection precision of the first applicator 200, the second applicator 300 and the catheter 100, and 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.

[0068] Further, the catheter 100 comprises a main pipe part 110 and a rotation-stopping part 120 arranged on the outer circumferential surface of the main pipe part 110, at least part of the first clamping cavity 201 is embedded in part of the rotation-stopping part 120, and at least part of the second clamping cavity is embedded in another part of the rotation-stopping part 120, so as to fix and limit the rotation of the catheter 100.

[0069] In the embodiment, the first clamping cavity 201 comprises a first rotation-stopping cavity 2011 and a first semi-conical cavity 2012, the first rotation-stopping cavity 2011 is communicated with the first semi-conical cavity 2012, the small end of the first semi-conical cavity 2012 can be in contact with the outer circumferential surface of the catheter 100, and the large end of the first semi-conical cavity 2012 is more convenient for guiding the small end to be in contact with the outer circumferential surface of the catheter 100, so that the first applicator 200 can move along the outer circumferential surface of the catheter 100 through the first semi-conical cavity 2012. The first rotation-stopping cavity 2011 is embedded in part of the rotation-stopping part 120, so as to limit the rotation of the catheter 100 along the circumferential direction. The second clamping cavity comprises a second rotation-stopping cavity and a second semi-conical cavity, the second rotation-stopping cavity is communicated with the second semi-conical cavity, the small end of the second semi-conical cavity can be in contact with the outer circumferential surface of the catheter 100, and the large end of the second semi-conical cavity is more convenient for guiding the small end to be in contact with the outer circumferential surface of the catheter 100, so that the second applicator 300 can move along the outer circumferential surface of the catheter 100 through the second semi-conical cavity. The second rotation-stopping cavity is embedded in part of the rotation-stopping part 120, so as to limit the rotation of the catheter 100 along the circumferential direction.

[0070] The first clamping cavity 201 and the second clamping cavity form a total clamping cavity in the shape of a cone. The shape of the total clamping cavity is more convenient for the cooperation of the catheter 100, the first applicator 200 and the second applicator 300. The catheter 100 itself has a bending position, the first applicator 200 can move along the bending part of the catheter 100 through the small end of the first semi-conical groove, so as to avoid being stuck in the complete position of the catheter 100, and improve the installation convenience of the first applicator 200. Similarly, the installation convenience of the second applicator 300 is also improved.

[0071] Further, the rotation-stopping part 120 further comprises a first limiting groove 121 and a second limiting groove 122, the first applicator 200 further comprises a first limiting protrusion 260 arranged on the first clamping cavity 201, and the second applicator 300 further comprises a second limiting protrusion arranged on the second clamping cavity; wherein the afterloading brachytherapy precise positioning device is configured to: in the working state, the first limiting protrusion 260 is connected in the first limiting groove 121, and the second limiting protrusion is connected in the second limiting groove 122.

[0072] It is worth understanding that through the cooperation of the first limiting groove 121 and the first limiting protrusion 260, the cooperation of the second limiting groove 122 and the second limiting protrusion, the rotation of the first applicator 200, the second applicator 300 and the catheter 100 is prevented, so that the first applicator 200, the second applicator 300 can fix the catheter 100, and the fixing reliability of the catheter 100 is improved.

[0073] The rotation stopping part 120 is in the shape of a "mountain", the recess on the left side of the "mountain" shape of the rotation stopping part 120 is the first limiting groove 121, and the recess on the right side of the "mountain" shape of the rotation stopping part 120 is the second limiting groove 122. The first rotation stopping cavity 2011 is embedded in one half of the rotation stopping part 120, and the second rotation stopping cavity is embedded in the other half of the rotation stopping part 120.

[0074] Referring to Figure 1 It is worth understanding that the uniform distribution of the first gas holes along the first peripheral surface 212 makes the protrusions formed by the first elastic membrane 240 uniform, and further makes the first peripheral surface 212 of the first applicator 200 bear uniform force, avoiding the deviation of the first applicator 200 from the preset position.

[0075] All the second gas holes are also uniformly and interval distributed along the periphery of the second peripheral surface.

[0076] In some embodiments of the present application, the diameter of the first gas path 213 is L, and L≤3mm. It is worth understanding that the total amount of gas in the first gas bag and the first gas path 213 is fixed. When the first gas bag is compressed, the gas pressure increases, and further the first elastic membrane 240 is inflated. The deformation of the first elastic membrane 240 requires a large pressure value. The smaller the diameter of the first gas path 213, the less the gas content in the first gas path 213. When the volume of the first gas bag decreases, the overall pressure value in the first gas bag and the first gas path 213 is larger, so that the deformation effect of the first elastic membrane 240 is better.

[0077] The diameter of the second gas path is X, and X≤3mm.

[0078] Referring to Figure 2 , Figure 4 and Figure 8 As shown in the drawings, in some embodiments of the present application, the first insertion part 230 includes a first insertion main body part 231 and a first insertion protrusion 232 provided on the outer peripheral surface of the first insertion main body part 231, and the first insertion slot part 220 includes a first insertion slot main body part 221 and a first insertion recess 222 provided on the outer peripheral surface of the first insertion slot main body part 221; wherein the rear-mounted brachytherapy precise positioning device is configured to: in the working state, the first insertion protrusion 232 is connected with the first insertion recess 222.

[0079] It is worth understanding that through the clamping of the first insertion protrusion 232 and the first insertion groove 222, medical staff can feel the vibration when operating the first applicator 200 and the second applicator 300 to cooperate, and when the first insertion protrusion 232 and the first insertion groove 222 are clamped in place, medical staff can know that the first applicator 200 and the second applicator 300 are installed in place, facilitating the operation of medical staff. At the same time, the clamping of the first insertion protrusion 232 and the first insertion groove 222 can increase the connection reliability of the first applicator 200 and the second applicator 300.

[0080] Referring to Figure 1 As shown in the figure, in some embodiments of the present application, the first applicator 200 further comprises a first rod portion 270, one end of the first rod portion 270 being connected to the first main body portion 210. It is worth understanding that by connecting the first main body portion 210 through the first rod portion 270, medical staff can control the first applicator 200 to extend into the human body through the first rod portion 270, facilitating the operation of medical staff.

[0081] Referring to Figure 1 , Figure 2 and Figure 3 As shown in the figure, in some embodiments of the present application, the first insertion portion 230 and the first slot portion 220 are arranged in a radial direction of the catheter 100, the first insertion portion 230 has a first insertion end, the first slot portion 220 has a first slot, and the first insertion end and the first slot are oriented to the same end.

[0082] It is worth understanding that the first slot and the first insertion end are oriented to the same end, facilitating the insertion of the second insertion portion 330 and the second slot portion 320 in the second applicator 300 into the first slot and the first insertion end in the first applicator 200 in the same direction, and the installation and cooperation of the first applicator 200 and the second applicator 300 are more convenient, and medical staff are more convenient to operate.

[0083] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the present application.

Claims

1. A precise positioning device for afterloading brachytherapy, characterized in that, include: catheter; The first applicator includes a first main body, a first slot, a first insertion, a first airbag, and a plurality of first elastic membranes. The first main body has a first opposing surface, a first peripheral surface, and a first air passage. The first slot and the first insertion are both located on the first opposing surface. The first peripheral surface has a plurality of first air holes. Each first elastic membrane covers a first air hole. The first airbag is located inside the first slot and is connected to the first air hole through the first air passage. The second applicator includes a second main body, a second slot, a second insertion, a second airbag, and a plurality of second elastic membranes. The second main body has a second opposing surface, a second peripheral surface, and a second air passage. The second slot and the second insertion are both located on the second opposing 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 located inside the second slot and is connected to the second air hole through the second air passage. The 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 part is inserted into the second slot part and squeezes the second airbag, and the second elastic membrane deforms and protrudes from the second peripheral surface; the second insertion part is inserted into the first slot part and squeezes the first airbag, and the first elastic membrane deforms and protrudes from the first peripheral surface. The first opposing surface has a first clamping cavity, and the first applicator further includes a first fixing airbag disposed on the inner peripheral surface of the first clamping cavity. The first fixing airbag is connected to 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 fixing airbag disposed on the inner peripheral surface of the second clamping cavity. The second fixing airbag is connected to the second airbag through the second air passage. The 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, the first fixing balloon inflates between the inner circumferential surface of the first clamping cavity and the outer circumferential surface of the catheter to fix the catheter; and the second fixing balloon inflates between the inner circumferential surface of the second clamping cavity and the outer circumferential surface of the catheter to fix the catheter.

2. The precise positioning device for brachytherapy afterloading according to claim 1, characterized in that: The catheter includes a main tube and an anti-rotation portion disposed on the outer periphery of the main tube. At least a portion of the first clamping cavity is fitted into a portion of the anti-rotation portion, and at least a portion of the second clamping cavity is fitted into another portion of the anti-rotation portion to fix and restrict the rotation of the catheter.

3. The precise positioning device for brachytherapy afterloading according to claim 2, characterized in that: The anti-rotation part further includes a first limiting groove and a second limiting groove, the first applicator further includes a first limiting protrusion disposed in the first clamping cavity, and the second applicator further includes a second limiting protrusion disposed in the second clamping cavity; The brachytherapy precise positioning device is configured such that, in the working state, the first limiting protrusion is engaged within the first limiting groove, and the second limiting protrusion is engaged within the second limiting groove.

4. The precise positioning device for brachytherapy afterloading according to claim 1, characterized in that: The first clamping cavity and the second clamping cavity together form a conical total clamping cavity.

5. The precise positioning device for brachytherapy afterloading according to claim 1, characterized in that: All the first pores are evenly spaced along the circumference of the first circumferential surface.

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

7. The precise positioning device for brachytherapy afterloading according to claim 1, characterized in that: The first insertion portion includes a first insertion main body portion and a first insertion protrusion disposed 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 disposed on the outer peripheral surface of the first slot main body portion. The brachytherapy precise positioning device is configured such that, in the working state, the first insertion protrusion engages with the first insertion groove.

8. The precise positioning device for brachytherapy afterloading according to claim 1, characterized in that: The first insertion part and the first slot part are radially offset along the conduit. The first insertion part has a first insertion end, and the first slot part has a first groove. The first insertion end and the first groove face the same end.

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

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