A trocar for internal radiotherapy and an electron beam energy monitoring method

Abstract

The present invention relates to the technical field of internal radiotherapy, and discloses a trocar for internal radiotherapy and an electron beam energy monitoring method. The trocar includes a needle tube, and an installation through hole for installing a beam needle is penetratingly opened along the length direction of the needle tube. One end of the needle tube is provided with a needle tip, and the needle tip includes an insulating section and a tip section. The insulating section is located between the needle tube and the tip section, and an inductance coil is wound around the insulating section. The inductance coil is electrically connected to a voltage measuring device. By arranging an inductance coil on the electron beam transmission path, the energy of the electron beam currently injected into the human body can be accurately obtained by measuring the induced voltage of the inductance coil, so as to achieve a better radiotherapy effect.

Description

Technical Field

[0001] The present invention relates to the technical field of internal radiotherapy, and particularly relates to a trocar for internal radiotherapy and an electron beam energy monitoring method. Background Art

[0002] The principle of radiotherapy is to use high-energy radiation such as X-rays, electrons, etc. to damage the DNA of cancer cells to kill them. Since radiotherapy damages normal cells while killing cancer cells, the treatment must be carefully planned to minimize this side effect. The radiation used for cancer treatment can come from an external device, which is called external radiotherapy, or from radioactive substances implanted in the body close to cancer cells, which is called internal radiotherapy or brachytherapy.

[0003] Chinese Patent with the application number "CN201810907457.9" and the name "Tumor Treatment Device and Its Use Method" discloses a tumor treatment device and its use method, which belongs to a kind of internal radiotherapy method. Specifically: connect the beam needle with the electron beam emitting device, and emit the electron beam emitted by the electron beam emitting device through the beam needle to hit the tumor lesion site in the human body to ablate the tumor. Since the penetration ability of the electron beam is weak, higher energy will not be deposited on the normal tissues before and after the tumor lesion site, which can avoid the damage to normal tissues when the electron beam ablates the tumor, thereby reducing the harm to the human body and reducing the pain during the human treatment process.

[0004] Although the electron beam does not deposit higher energy on human tissues compared with X-rays, however, if the electron beam energy cannot be precisely controlled, either the electron beam with insufficient energy cannot be provided to ablate the tumor during the treatment process, or damage will be caused to the normal tissues outside the tumor lesion site during the treatment process; and there is a certain energy loss when the electron beam is emitted from the electron beam emitting device and introduced into the human body through the beam needle, and this energy loss is not fixed. Therefore, in this field, how to precisely control the energy of the electron beam emitted from the beam needle has become a technical problem to be solved in the internal radiotherapy scheme. Summary of the Invention

[0005] The purpose of the present invention is to provide a trocar for internal radiotherapy and an electron beam energy monitoring method to solve the above technical problems.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a trocar for internal irradiation radiotherapy, comprising a needle tube, wherein the needle tube has a mounting hole for mounting a beam needle formed therethrough along its length, and a needle tip is provided at one end of the needle tube, wherein the needle tip comprises an insulating section and a needle tip section, wherein the insulating section is located between the needle tube and the needle tip section;

[0008] An inductor coil is wound around the outside of the insulating section; the inductor coil is electrically connected to a voltage measuring device, and the voltage measuring device is used to measure the induced voltage on the inductor coil in real time during internal irradiation radiotherapy.

[0009] Optionally, the needle further includes a connecting section;

[0010] The connecting section is provided with a guide hole extending through the longitudinal direction, and the guide hole is connected to the mounting through hole;

[0011] The connecting section is located between the needle tube and the insulating section.

[0012] Optionally, the needle tip section is in the shape of a cone; the tip of the cone is arranged away from the insulating section and is located on the transmission path of the electron beam emitted by the beam needle.

[0013] Optionally, the connecting section and the insulating section are both truncated cone-shaped tubular bodies;

[0014] The needle tip section is in the shape of a cone; the center lines of the tubular body and the cone coincide with each other.

[0015] Optionally, the voltage measuring device is installed on the outer wall of the other end of the needle tube, and the positive pole and the negative pole of the voltage measuring device are electrically connected to the two ends of the inductor coil through a wire.

[0016] Optionally, the insulating segment is made of resin or ceramic material.

[0017] Optionally, the needle tube, the connecting section, the insulating section and the needle tip section are integrally formed; the needle tube, the connecting section and the needle tip section are all made of stainless steel or silicon carbide.

[0018] Optionally, the wire is welded or adhered to the outer wall of the trocar.

[0019] In a second aspect, the present invention further provides a method for monitoring electron beam energy for internal irradiation radiotherapy, comprising:

[0020] predetermining a corresponding relationship between the electron beam energy of the electron beam emitted from the needle tip segment and the induced voltage of the inductor coil;

[0021] Pre-insert the trocar into a predetermined radiotherapy site in the human body, and insert the beam needle into the installation through-hole;

[0022] During the internal radiotherapy process, obtain the induced voltage measured by the voltage measuring device in real time;

[0023] Determine the energy of the electron beam currently injected into the radiotherapy site according to the measured induced voltage.

[0024] Optionally, a predetermined gap is provided between the electron beam emission end of the beam needle and the insulating section;

[0025] Among them, the induced voltage is positively correlated with the energy of the electron beam passing through the inductance coil, and the energy of the electron beam passing through the inductance coil is positively correlated with the energy of the electron beam injected into the radiotherapy site.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] By circumferentially arranging an inductance coil on the electron beam transmission path, when the electron beam passes through the inductance coil, an induced voltage will be generated on the inductance coil. The induced voltage is positively correlated with the energy of the electron beam injected into the radiotherapy site, and this positive correlation relationship can be obtained through pre-experiments. Therefore, by collecting the induced voltage, the energy of the electron beam currently injected into the human body can be accurately known, so as to achieve an accurate radiotherapy effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic structural diagram of a trocar for internal radiotherapy provided by an embodiment of the present invention;

[0030] Figure 2 It is a flowchart of a method for monitoring the energy of an electron beam for internal radiotherapy provided by an embodiment of the present invention.

[0031] In the figure:

[0032] 10. Needle tube; 11. Connection section; 110. Flow guide hole; 20. Insulating section; 21. Inductance coil; 22. Lead wire; 23. Voltage measuring device; 30. Tip section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to make the object, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a trocar for internal radiotherapy provided by an embodiment of the present invention.

[0035] It includes a needle tube 10. The needle tube 10 is provided with an installation through hole for installing a beam needle in a penetrating manner along its length direction. One end of the needle tube 10 is provided with a needle tip, and the needle tip includes a connection section 11, an insulating section 20, and a tip section 30. The insulating section 20 is located between the connection section 11 and the tip section 30;

[0036] An inductance coil 21 is wound around the insulating section 20; the inductance coil 21 is electrically connected to a voltage measuring device 23, and the voltage measuring device 23 is used to measure the induced voltage on the inductance coil 21 in real time during internal radiotherapy.

[0037] When the electron beam emitted by the beam needle passes through the insulating section 20, an induced voltage will be generated in the inductance coil wound on the outer wall of the insulating section 20. This induced voltage has a positive correlation with the energy of the electron beam passing through the insulating section 20. When the electron beam is emitted through the tip section 30 to the radiotherapy site, the attenuation ratio of the electron beam energy by the tip section 30 can also be obtained through pre-experiments. Therefore, by measuring the induced voltage on the inductance coil 21, the energy of the electron beam currently injected into the human body can be accurately known, thereby achieving an accurate radiotherapy effect.

[0038] Specifically, the connection section 11 is provided with a diversion hole 110 in a penetrating manner along the length direction. The diversion hole 110 is communicated with the installation through hole; the connection section 11 is located between the needle tube 10 and the insulating section 20.

[0039] Specifically, the tip section 30 is in a conical shape; the tip of the conical shape is arranged away from the insulating section 20 and is located on the transmission path of the electron beam emitted by the beam needle.

[0040] Specifically, both the connection section 11 and the insulating section 20 are tubular bodies in a frustum shape;

[0041] The shape of the tip section 30 is a cone; the center lines of the tubular body and the cone coincide.

[0042] Specifically, the voltage measuring device 23 is installed on the outer wall of the other end of the needle tube 10, and the positive and negative electrodes of the voltage measuring device 23 are electrically connected to both ends of the inductance coil 21 through the lead wire 22 respectively.

[0043] Specifically, the insulating section 20 is made of resin or ceramic material.

[0044] Specifically, the needle tube 10, the connecting section 11, the insulating section 20 and the needle tip section 30 are integrally formed; the needle tube 10, the connecting section 11 and the needle tip section 30 are all made of stainless steel or silicon carbide.

[0045] Specifically, the lead wire 22 is welded or pasted on the outer side wall of the trocar. However, it can be understood that the lead wire 22 can also be integrally formed with the outer wall of the trocar, or buried inside the tube wall of the trocar, which should not be construed as a limitation to the protection scope of the present invention.

[0046] Please refer to Figure 2 , Figure 2 FIG. is a flowchart of an electron beam energy monitoring method for internal radiotherapy provided by an embodiment of the present invention. The electron beam energy monitoring method for internal radiotherapy specifically includes:

[0047] Presetting step 100, pre-determining the correspondence between the electron beam energy of the electron beam emitted from the needle tip section and the induced voltage of the inductance coil.

[0048] Because the induced voltage is positively correlated with the electron beam energy of the electron beam passing through the inductance coil, and for the same trocar, the electron beam energy of the electron beam entering the needle tip section is positively correlated with the electron beam energy of the electron beam emitted from the needle tip section; in a laboratory environment, by simulating the application scenario of internal radiotherapy, a plurality of sets of corresponding data between the electron beam energy of the electron beam emitted from the needle tip section and the induced voltage are obtained, and the correspondence between the electron beam energy of the electron beam emitted from the needle tip section and the induced voltage can be obtained through calculation.

[0049] It should be understood that the collected induced voltage is positively correlated with the electron beam energy of the current electron beam entering the radiotherapy site. After obtaining several sets of corresponding data through multiple simulations, a relatively accurate algorithm can be deduced. There may be some errors in this algorithm. However, this error can be minimized to an acceptable range through repeated simulation experiments, and moreover, it will not affect the monitoring and control of the electron beam energy during internal radiotherapy.

[0050] Presetting step 101, pre-extending the trocar into a predetermined radiotherapy site in the human body, and inserting the beam needle into the installation through hole.

[0051] Step 110, during the internal radiotherapy process, real-time obtain the induced voltage measured by the voltage measuring device.

[0052] Specifically, the induced voltage of the inductor coil is collected in real time by a voltage measuring device. Among them, the voltage measuring device can be a voltmeter or an electronic module that can measure voltage.

[0053] Step 120: Determine the energy of the electron beam currently incident on the radiotherapy site according to the measured induced voltage.

[0054] Through the collected induced voltage, according to the positive correlation between the induced voltage and the energy of the electron beam incident on the radiotherapy site obtained through pre-experiments, the energy of the electron beam currently incident on the human body can be accurately known, and then the radiotherapy device can be controlled more accurately, so as to achieve a better radiotherapy effect.

[0055] In this embodiment, a predetermined gap is provided between the electron beam emitting end and the insulating section of the beam current needle, so that the electron beam emitted from the electron beam emitting end can enter the needle tip section through the insulating section.

[0056] Those of ordinary skill in the art can understand that all or part of the steps of implementing the above embodiments can be completed by hardware, or can be controlled by a program or instruction to complete the relevant hardware. The program or instruction can be stored in a computer-readable storage medium, and the storage medium can include a memory, a disk or an optical disc, etc.

[0057] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A trocar for internal radiotherapy, comprising a needle tube (10), wherein the needle tube (10) is provided with an installation through hole for installing a beam needle in a penetrating manner along its length direction, and one end of the needle tube (10) is provided with a needle head, characterized in that, The needle includes an insulating section (20) and a tip section (30), and the insulating section (20) is located between the needle tube (10) and the tip section (30); An inductance coil (21) is wound around the insulating section (20); the inductance coil (21) is electrically connected to a voltage measuring device (23), and the voltage measuring device (23) is used to measure the induced voltage on the inductance coil (21) in real time during endovascular radiotherapy; The needle further includes a connecting section (11); A diversion hole (110) is formed through the connecting section (11) along the length direction, and the diversion hole (110) communicates with the installation through hole; The connecting section (11) is located between the needle tube (10) and the insulating section (20); The tip section (30) is in a conical shape; the tip of the conical shape is arranged away from the insulating section (20) and is located on the transmission path of the electron beam emitted by the beam needle; The voltage measuring device (23) is installed on the outer wall of the other end of the needle tube (10), and the positive and negative electrodes of the voltage measuring device (23) are electrically connected to the two ends of the inductance coil (21) by wires (22) respectively.

2. The trocar for internal radiotherapy according to claim 1, wherein, Both the connecting section (11) and the insulating section (20) are tubular bodies in a frustum shape; The shape of the tip section (30) is a cone; the center lines of the tubular body and the cone coincide.

3. A trocar for internal radiotherapy according to claim 1, characterized in that, The insulating section (20) is made of resin or ceramic material.

4. A trocar for internal radiotherapy according to claim 3, characterized in that, The needle tube (10), the connecting section (11), the insulating section (20) and the tip section (30) are integrally formed; the needle tube (10), the connecting section (11) and the tip section (30) are all made of stainless steel or silicon carbide.

5. A trocar for internal radiotherapy according to claim 1, characterized in that, The wire (22) is welded or pasted on the outer side wall of the trocar.

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