JP2010269053A - Medical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical instrument with which a therapy can be performed, regardless of the original site of cancer. <P>SOLUTION: The medical instruments 10, 20, 30 include: needle tubes 11, 31 which are formed of conductive cylindrical members to be connected to a positive or negative electrode, and have medicial solution injection holes on the side surfaces of the distal ends; needle bodies 12, 32 which are insertable from proximal end sides into the inner parts of the needle tubes 11, 31, formed of conductive needle shape members to be connected to the opposite electrodes of the needle tubes 11, 31, and provided with insulating parts 15, 33 on the outer peripheral surfaces in contact with the inner surfaces of the needle tubes 11, 31; and heat generation bodies 14, 34 with prescribed heat generation resistances, which are arranged so as to clog the openings at the distal ends of the needle tubes 11, 31 and also to come in contact with the distal ends of the needle bodies 12, 32. When the needle bodies 12, 32 are inserted from the proximal end sides into the inner parts of the needle tubes 11, 31 to thereby allow the distal ends of the needle bodies 12, 32 to come in contact with the heat generation bodies 14, 34, the needle bodies 12, 32 and the needle tubes 11, 31 are energized via the heat generation bodies 14, 34. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention reduces the spread of tumor contact caused by instrument contact by biopsy inspection of tumors such as cancer by the chlorine sterilization effect of the instrument itself, and also treats tumors such as cancer by directly heat sterilizing tumors such as cancer It relates to medical devices.

  Conventionally, surgical (surgical) therapy, chemotherapy, hormone therapy, radiation therapy, etc. have been widely used as treatment methods for tumors such as cancer, as well as immunotherapy, catheter therapy, puncture therapy, thermocoagulation therapy, thermotherapy, etc. Are known.

  Surgery (surgical) therapy may not be adequately performed depending on the physical strength and age of the patient and hospital equipment. In addition, even if the patient can withstand surgical (surgical) therapy, it must be removed without damaging the tumor, so a wide range of extraction is necessary. Therefore, when a breast is completely removed from breast cancer, it often has a great influence on the life after surgery. Furthermore, even if the tumor cells are completely removed, tumor cell metastasis may occur due to seeding such as tumor contact at the time of removal.

  Chemotherapy is a treatment method to suppress the activity of cancer cells, but since anticancer drugs themselves are poisons in the first place, they are effective not only for cancer cells but also for the whole body, so that normal cells are damaged. There are concerns about the development of adverse events.

  Although hormone therapy is said to be effective for hormone-dependent cancer, it is effective when the hormone receptor is positive, but when the hormone receptor is negative, no effect can be expected.

  Although radiation therapy can almost certainly destroy tumor cells such as cancer, it is possible to irradiate only fixed organs, so there is a concern about exposure damage to normal cells caused by irradiation of tumors between normal cells. The

  Particle beam therapy is a type of radiation therapy. X-rays and gamma rays, which are generally referred to as radiation, have a high cell destruction effect on the shallow part from the body surface and are not suitable for treatment of the deep part of the body surface, but protons obtained by accelerating protons with cycloton or accelerator・ When heavy particle beams are used, the amount of radiation exposure at the deeper part of the body surface increases, so it is said to be effective against cancers deeper from the body surface. However, since radiation has not changed, there is concern about damage to normal cells.

  Immunotherapy is a therapy in which cancer cells are killed by killer cells in the blood that has been proliferated, but is necessary for reproduction for a long period of time, and its cost is high.

  In addition, as a similar immunotherapy, tumor cells such as removed cancer of a patient are killed by third party lymphocytes, and third party lymphocytes that recognize tumor cells such as cancer as foreign substances are administered, so that the There are also therapies that kill the tripartite lymphocytes. In this therapy, the information that the patient's cancer tumor cells contained in the third-party lymphocytes is a foreign substance is imprinted on the patient's lymphocytes. The sphere begins to attack, but when normal cells are contained in tumor cells such as cancer, the patient's own lymphocytes attack not only tumor cells such as cancer but also normal cells (GVHD (graft-versus-host disease) )), Or it could be suicide.

  Catheter treatment is a therapy that blocks cancer blood vessels of cancer cells and weakens the cancer, and is a therapy in which an anticancer drug is administered directly in the vicinity of the cancer cells. Occlusion of cancer blood vessels using a catheter means that there is no single cancer blood vessel, and there is a possibility of promoting cancer cell metastasis by inserting a catheter in the vicinity of the cancer and performing treatment such as an anticancer agent for obstruction .

  Puncture treatment includes ethanol injection therapy and thermocoagulation therapy. Among thermocoagulation therapy, there are microwave therapy and radiofrequency therapy. Ethanol infusion therapy is a therapy that destroys cancer cells and cancer blood vessels with a high concentration of ethanol, and is effective in removing cancer blood vessels after thermocoagulation, but the injected alcohol diffuses. Conceivable.

  Among thermocoagulation therapy, microwave therapy is a therapy in which cells are vibrated by generating a high frequency from the needle tip, and cancer cells are killed by the vibrational heat. The question remains about the impact on the human body.

  In addition, radiofrequency therapy among thermocoagulation therapy is a therapy that kills cancer cells by applying heat to neighboring cells by heat dissipation from the electrodes, but because the heat is concentrated at the tip of the instrument, Accidents have occurred where cancer cells have ruptured, or holes have been made in other organs by heat, leading to the death of patients. Furthermore, it is said that cancer is scattered by the burning of the ablation by heat.

  Hyperthermia is a therapy devised from the fact that tumor cells such as cancer disappear at a temperature of about 42 to 43 degrees from clinical cases. Conventionally, a heated blood circulation method, a thermal body adhesion method, a hyperthermia, etc. The therapy has been carried out.

  The heated blood collection and circulation method is a therapy that kills tumor cells such as cancer by circulating blood heated to about 42 degrees in the body, but is not currently performed. This is not the body surface, but has a heat of about 42 degrees from the body to the body surface, and thermotherapy is a therapy that is effective when heated for a long time. If you have a strong body, there will be considerable pain.

  The thermal body bonding method is a therapy in which a heating element is pressed against the affected epidermis and heated partially to heat up tumor cells such as cancer in the deep part, but it is hardly performed at present. As with the heating voting circulation method, considerable pain is involved.

  Hyperthermia is a method of causing a tumor to vibrate and generate heat by electromagnetic waves so that the tumor disappears. In simple terms, this is an application of microwave ovens to treat tumors such as cancer, and is considered to have little effect other than heat from electromagnetic waves. However, if there is no effect other than heat on normal cells due to electromagnetic waves, it is considered the most effective method for treating tumors such as tumors such as cancer.

  As a similar method of thermotherapy, there is a method of heating the picked part of the acupuncture needle and transmitting the heat from the body surface to the affected area, but it is originally required for the use of acupuncture, and as a treatment tool for tumor cells such as cancer, Since the amount of heat and heating time are insufficient, it is not used.

  Conventionally, various medical instruments have been developed to perform the above-described treatment methods (see, for example, Patent Documents 1 to 6).

  The invention described in Patent Document 1 is a fever treatment tool in which an insulating core material inside a treatment tool is fixed before and after the treatment tool, and cannot be used as an injection needle. The tumor and the treatment device itself cannot be sterilized.

  The invention described in Patent Document 2 is a fever treatment tool that utilizes microwave heat generation action, and is an invention that widens the range of influence of microwaves by taking a wide tip, and is fundamentally different from the electrothermal power generation method according to the present invention. It is a heterogeneous invention.

  The invention described in Patent Document 3 is an invention in which the microwave antenna is extended from the distal end of the treatment tool to extend the microwave influence range, and the needle tip or needle core does not have a heating element. Therefore, like Patent Document 2, the invention is fundamentally different from the electrothermal power generation method according to the present invention.

  The invention described in Patent Document 4 is an invention characterized in that all or part of the air core part of the needle tube is filled with a living body heating needle that heats the affected part with an alternating magnetic field, and the living body heating needle is heated. Therefore, an AC magnetic field induction coil is necessary and there is no function as an injection needle. Furthermore, it is impossible to sterilize the tumor and the treatment tool itself by generating a disinfecting solution by electrolysis from the movable core material tip and the entire treatment tool. Therefore, the present invention is fundamentally a heterogeneous invention.

  The invention described in Patent Document 5 is a therapeutic or diagnostic drug delivery device having a monopolar and bipolar electrode. A monopolar electrode is an electrode that is connected to a high-frequency current generator and used for coagulation and incision of living tissue. A bipolar electrode has an anode and a cathode alternately arranged at the tip on a spiral, and is between two adjacent electrodes. Since the current flows through, the invasion does not reach the deep part. Further, the shape is a double needle structure having a space between the inner cylinder and the outer cylinder, and a suction port is provided on the side surface of the outer cylinder, thus forming a double cylinder structure. From the above, the present invention is fundamentally different.

  The invention described in Patent Document 6 is a high-frequency thermotherapy electrode, and has a structure in which a needle-like conductor is inserted into an insulating member. Therefore, independent heat generation is impossible, and the invention is fundamentally different from the present invention. It is.

Japanese translation of PCT publication No. 2003-511211 JP-T-2004-518471 JP-T-2006-503630 JP 2007-244748 A JP 2006-520663 A JP-A-6-190059

  However, the above-described conventional medical devices have a problem that treatment cannot be performed depending on the cancer occurrence site.

  In addition, there is a problem that the patient's physical strength is greatly consumed, and there is a possibility of sequelae such as phytotoxicity and sequelae of normal cell damage due to radiation or electromagnetic waves.

  Furthermore, there has been a problem that tumor metastasis may occur due to contact with the tumor, or cell ablation rupture may occur to suppress metastasis.

  Furthermore, there is a problem that an expensive and expensive facility and equipment are required, and no one can easily treat, and the treatment cost increases.

  The present invention has been made to solve the above-described problems, can be treated regardless of the site of occurrence of cancer, has no risk of sequelae or tumor metastasis, and can reduce the cost of treatment. The object is to provide a medical device.

  In order to achieve the above-described object, a medical device according to the present invention is formed by a conductive cylindrical member connected to one of a positive electrode and a negative electrode, and has a needle tube having a drug solution injection hole on the side surface of the distal end. The conductive needle-like member is provided so as to be inserted into the needle tube from the base end side and is connected to an electrode opposite to the needle tube, and an insulating portion is formed on the outer peripheral surface contacting the inner surface of the needle tube. And a heating element having a predetermined heating resistance provided so as to be able to close the opening on the distal end side of the needle tube and to be in contact with the distal end of the needle body, and the needle body from the proximal end side of the needle tube The needle body and the needle tube are energized through the heating element when inserted inside and the tip of the needle body is brought into contact with the heating element.

  Moreover, the medical device which concerns on this invention WHEREIN: The said chemical | medical solution injection hole may be formed so that the front-end | tip part of the said needle body can enter / exit from the said needle tube.

  The medical instrument according to the present invention is provided with a needle tube formed of a conductive cylindrical member connected to one of the positive electrode and the negative electrode, and inserted into the needle tube from the proximal end side. A needle body formed by a conductive needle-like member connected to an electrode opposite to the needle tube and having an insulating portion formed on an outer peripheral surface thereof in contact with the inner surface of the needle tube; a tip of the needle tube; A heating element having a predetermined heating resistance provided at at least one of the distal ends, and when the needle body is inserted into the needle tube from the proximal end side, the needle body and the needle tube cause the heating element to It is comprised so that it may contact and may energize.

  Furthermore, in the medical instrument according to the present invention, the needle tube and the needle body may be formed of a flexible material.

  According to the present invention, it is possible to perform treatment regardless of the site of occurrence of cancer, there is no risk of sequelae or tumor rearrangement, and various excellent effects can be obtained, such as reduction in treatment costs. it can.

(A)-(c) is sectional drawing which shows the medical device which concerns on the 1st Embodiment of this invention altogether. (A)-(e) is sectional drawing which shows the usage method of the medical device which concerns on the 1st Embodiment of this invention. (A)-(c) is sectional drawing which shows all the medical devices which concern on the 2nd Embodiment of this invention. (A)-(e) is sectional drawing which shows the usage method of the medical device which concerns on the 2nd Embodiment of this invention. (A)-(c) is sectional drawing which shows another usage method of the medical device which concerns on the 2nd Embodiment of this invention. (A)-(c) is sectional drawing which shows all the medical devices which concern on the 3rd Embodiment of this invention. (A)-(e) is sectional drawing which shows the usage method of the medical device which concerns on the 3rd Embodiment of this invention. (A)-(c) is sectional drawing which shows the modification of the medical device which concerns on the 3rd Embodiment of this invention. (A)-(c) is sectional drawing which shows another modification of the medical device which concerns on the 3rd Embodiment of this invention. (A)-(c) is sectional drawing which shows another modification of the medical device which concerns on the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the configuration of the medical device according to the first embodiment of the present invention will be described with reference to FIGS.

  1 (a) to 1 (c) are cross-sectional views showing a medical instrument according to the first embodiment of the present invention. The medical instrument 10 according to the present embodiment is a thin cylindrical member having electrical conductivity. And a needle body 12 formed by a thin conductive needle-like member. The needle body 12 can be inserted into the needle tube 11 from the base end side.

  The needle tube 11 has a pointed shape with a distal end cut obliquely, a chemical solution injection hole 13 is formed in the side surface of the distal end, and either a positive electrode or a negative electrode is formed at the proximal end portion. Connected. Further, a metal heating element 14 having a predetermined heat generation resistance is welded to the tip of the needle tube 11 so as to close the opening on the distal end side of the needle tube 11, and the heating element 14 matches the tip shape of the needle tube 11. It has a pointed shape.

  The needle body 12 has a pointed shape with a distal end obliquely cut so as to match the heating element 14, and an insulating portion 15 is formed on the outer peripheral surface contacting the inner surface of the needle tube 11. Is connected to an electrode opposite to the needle tube 11.

  Next, with reference to FIGS. 2A to 2E, a method for using the above-described medical device 10 will be described by taking a case where cancer treatment is performed as an example. Here, FIGS. 2A to 2E are all cross-sectional views illustrating a method of using the medical instrument according to the present embodiment.

  First, as shown in FIG. 2A, a negative electrode is attached to the patient's body surface 16 or the proximal end of the needle tube 11, and the needle tube 11 is inserted into the body from the patient's body surface 16 to the cancer tumor portion 17, 11 is injected with an anesthetic solution 9.

  Next, as shown in FIG. 2B, the needle body 12 is inserted into the needle tube 11 from the proximal end side. 2C, a positive electrode is attached to the proximal end portion of the needle body 12, and a negative electrode is attached to the proximal end portion of the needle tube 11, and the distal end of the needle body 12 is brought into contact with the heating element 14. When energized, the heating element 14 generates heat at a constant temperature (for example, about 42 degrees) due to electrical resistance. Due to this fever, the pollutants in the cancer tumor portion 17 are sterilized and necrotized.

  Further, as shown in FIG. 2 (d), when a negative electrode is connected to the body surface 16 and a positive electrode is connected to the needle body 12, the electrolysis of the biological body fluid starts, and chlorine 18 from the salt water contained in the biological body fluid starts. Will occur. This chlorine 18 sterilizes the body-contaminated particulate matter and necroses it. At this time, when the needle tube 11 is inserted in a plurality of locations of the patient, the negative electrode may be connected to another needle tube 11 instead of connecting the negative electrode to the body surface 16.

  Thereafter, as shown in FIG. 2 (e), the needle body 12 is removed from the needle tube 11, and a chemical solution 19 of absolute ethanol is injected into the needle tube 11 to sterilize and disinfect the blood vessel for pollutants in the body.

  Further, in FIG. 2E, the chlorine 18 generated from the needle tube 11 and the needle body 12 can be neutralized with sodium thiosulfate or the like.

  Next, the configuration of the medical instrument according to the second embodiment of the present invention will be described with reference to FIGS. In the following description, for simplification of description, the same reference numerals as those in FIGS. 1 and 2 are assigned to the same configurations as those of the medical instrument 10 according to the first embodiment in FIGS. Detailed descriptions of these configurations will be omitted.

  FIGS. 3A to 3C are all cross-sectional views showing a medical device according to the second embodiment of the present invention. As can be seen from this cross-sectional view, the medical device according to the present embodiment is shown in FIGS. 20 is the first embodiment described above except that the chemical solution injection hole 21 is formed long along the insertion direction of the needle body 12 so that the tip of the needle body 12 can enter and exit from the needle tube 11. A configuration similar to that of the medical instrument 10 according to the embodiment is provided. In this case, the peripheral wall portion 22 of the chemical solution injection hole 21 and the distal end surface 12a of the needle body 12 are formed to be inclined in parallel to the distal end surfaces 11a and 14a of the needle tube 11 and the heating element 14, respectively. Thereby, the entrance / exit operation | movement from the needle tube 11 of the front-end | tip part of the needle body 12 can be performed smoothly.

  4 (a) to 4 (e) are cross-sectional views showing a method for performing cancer treatment using the medical device 20 according to the second embodiment of the present invention. First, FIG. As shown, a negative electrode is attached to the proximal end of the needle tube 11, the needle tube 11 is inserted into the body from the body surface 16 of the patient to the cancer tumor portion 17, and then the needle body 12 is inserted into the needle tube 11.

  Next, as shown in FIG. 4 (b), the tip of the needle body 12 is projected from the drug solution injection hole 21 to the cancer tumor portion 17 outside the needle tube 11, and a negative electrode is connected to the body surface 16 and the needle body 12. When the positive electrode is connected to the electrode and energized, electrolysis of the biological fluid starts near the tip of the needle body 12, and chlorine 18 is generated from the salt water contained in the biological fluid. This chlorine 18 sterilizes the body-contaminated particulate matter and necroses it. At this time, when the needle tube 12 is inserted in a plurality of locations of the patient, the negative electrode may be connected to another needle tube 12 instead of connecting the negative electrode to the body surface 16.

  Thereafter, as shown in FIG. 4C, when the needle body 12 is returned to the inside of the needle tube 11 and the distal end surface 12a of the needle body 12 is brought into contact with the heating element 14 and energized, the heating element 14 generates constant temperature heat by electric resistance. To do. Due to this fever, the pollutants in the cancer tumor portion 17 are sterilized and necrotized.

  As shown in FIG. 4 (d), when a negative electrode is connected to the body surface 16 and a positive electrode is connected to the needle body 12, the electrolysis of the biological body fluid starts, and chlorine 18 from the salt water contained in the biological body fluid begins. Will occur. This chlorine 18 sterilizes the body-contaminated particulate matter and necroses it.

  Thereafter, as shown in FIG. 4 (e), the needle body 12 is removed from the needle tube 11, and the drug solution 19 is injected into the needle tube 11 to sterilize and disinfect the body-contaminated fine substance blood vessel.

  As described above, according to the medical instrument 20 according to the second embodiment described above, the distal end portion of the needle body 12 can be protruded outside the needle tube 11 in the body of the patient. It can be generated to further enhance the sterilizing and disinfecting effect of the pollutant in the body.

  FIG. 5 is a cross-sectional view showing a method for performing necessary treatments such as inspection and incision in the body using the medical device 20 according to the second embodiment of the present invention. A negative electrode 23 is attached to the surface 16 or the proximal end of the needle tube 11, and the needle tube 11 is inserted into the body from the body surface 16 of the patient to perform necessary treatments such as examination and incision.

  Next, as shown in FIG. 5, when a positive electrode is connected to the needle tube 11 and a negative electrode 23 is connected to the body surface and energized, electrolysis of the biological body fluid starts on the outer surface of the needle tube 11 and is included in the biological body fluid. Chlorine 18 is generated from the salt water to be sterilized, and the internal pollutant is sterilized and necrotized by the chlorine 18. Thereafter, the needle tube 11 is removed from the body.

  Next, the configuration of the medical device according to the third embodiment of the present invention will be described with reference to FIGS.

  6 (a) to 6 (c) are cross-sectional views showing a medical instrument according to the third embodiment of the present invention. The medical instrument 30 according to the present embodiment is a thin cylindrical member having electrical conductivity. And a needle body 32 formed of a thin conductive needle-like member. The needle body 32 can be inserted into the needle tube 31 from the proximal end side.

  The needle tube 31 has a pointed shape with a distal end cut obliquely, the distal end surface is open, and either the positive electrode or the negative electrode is connected to the proximal end portion. Yes.

  In the needle body 32, an insulating portion 33 is formed on the outer peripheral surface contacting the inner surface of the needle tube 31, and an electrode opposite to the needle tube 31 is connected to the proximal end portion. A metal heating element 34 having a predetermined heat generation resistance is welded to the distal end of the needle body 32, and the distal end surface of the heating element 34 has a pointed shape that matches the distal end shape of the needle tube 31.

  Next, with reference to FIGS. 7A to 7G, a method for using the above-described medical device 10 will be described by taking as an example a case where cancer treatment is performed. Here, FIGS. 7A to 7G are cross-sectional views each showing a method of using the medical instrument according to the present embodiment.

  First, as shown in FIG. 7 (a), a negative electrode is attached to the patient's body surface 16 or the proximal end of the needle tube 31, and the needle tube 31 is inserted into the body from the patient's body surface 16 to the cancer tumor portion 17, Anesthetic liquid 9 is injected into 31.

  Next, as shown in FIG. 7B, the needle body 32 is inserted into the inside of the needle tube 31 from the proximal end side, and a positive electrode is attached to the proximal end portion of the needle body 32, and then shown in FIG. As described above, when the distal end portion of the needle body 32 protrudes from the distal end of the needle tube 31 to the cancer tumor portion 17 outside the needle tube 31 and is energized, the electrolysis of the biological body fluid starts in the vicinity of the distal end portion of the needle body 32, and the biological body fluid Chlorine 18 is generated from the salt water contained in the water. This chlorine 18 sterilizes the body-contaminated particulate matter and necroses it.

  At this time, as shown in FIG. 7 (d), when a positive electrode is connected to the proximal end portion of the needle tube 31, a negative electrode is connected to the body surface 16, and energization occurs, Decomposition begins and chlorine 18 is generated from the body fluid. This chlorine 18 sterilizes the body-contaminated particulate matter and necroses it. At this time, when the needle tube 12 is inserted in a plurality of locations of the patient, the negative electrode may be connected to another needle tube 12 instead of connecting the negative electrode to the body surface 16.

  Next, as shown in FIG. 7 (e), when the needle body 32 is returned to the inside of the needle tube 31 and the heating element 34 at the tip of the needle body 32 is brought into contact with the tip of the needle tube 31 to energize, the heating element 34 becomes Generates constant temperature heat due to electrical resistance. Due to this fever, the pollutants in the cancer tumor portion 17 are sterilized and necrotized.

  Further, as shown in FIG. 7 (f), when the needle body 32 is moved in the direction of pulling out inside the needle tube 31 in the energized state, the heat generation point 8 is also moved along with the movement, and this heat generation causes cancer. The pollutants in the tumor portion 17 are sequentially sterilized and necrotized.

  Thereafter, as shown in FIG. 7 (g), the needle body 32 is extracted from the needle tube 31, the chemical solution 19 of absolute ethanol is injected into the needle tube 31, and the blood vessel for in-vivo contaminated particulate matter is sterilized.

  In addition, in FIG. 7G, the chlorine 18 generated from the needle tube 32 and the needle body 32 can be neutralized with sodium sulfate or the like.

  In the third embodiment described above, the heating element 34 is attached only to the tip of the needle body 32. However, this is merely an example. For example, as shown in FIG. In addition, the heating element 34 is attached to the tip of the needle tube 31 or the heating element 34 is attached only to the tip of the needle tube 31 instead of the tip of the needle 32 as shown in FIG. It suffices to be attached to at least one of the tip of the needle tube 32 and the tip of the needle body 32.

  Further, as shown in FIG. 10, the needle tube 31 and the needle body 32 may be formed of a flexible material such as carbon fiber having conductive flexibility, and further, the needle tube 31 is disposed at an eccentric position in the needle tube 31. A core wire (not shown) may be embedded along the longitudinal direction, and the proximal end portion of the core wire may protrude from the proximal end of the needle tube 31. In this case, the distal end portion of the needle tube 31 can be bent at an arbitrary angle by pulling the proximal end portion of the core member in the proximal direction.

  Furthermore, the hook of the needle tube 31 is straightened by bending the tip of the needle tube 31 to provide a hook (not shown) and inserting the needle body 32, which is harder than the hook, up to the tip of the needle tube 31. It can be extended.

  By adopting such a configuration, it becomes possible to perform treatments other than fixed organs using the medical instrument of the present invention, and it becomes possible to perform treatment regardless of the site of occurrence of cancer.

  Furthermore, heat can be generated at the position of the heating element 34 in the needle tube 31 by moving the needle body 32 in the energized state.

  Furthermore, in each of the first to third embodiments described above, a temperature sensor may be attached to the needle tubes 11 and 31 and the needle bodies 12 and 32 so that the heat generation temperature of the heat generators 14 and 34 can be controlled.

  According to the above-described medical device according to the present invention, by directly heating the tumor, only the tumor can be extinguished without extinguishing / damaging normal cells, thereby minimizing the influence on the patient's body. It is possible to prevent the occurrence of sequelae such as phytotoxicity and the sequelae of normal cell damage due to radiation or electromagnetic waves.

  Furthermore, a negative electrode (or positive electrode) is connected to the needle tube or the body surface, and the positive electrode (or negative electrode) is connected to the needle body and energized to generate chlorine from the salt water contained in the biological body fluid. As a result, it is possible to reliably prevent tumor metastasis caused by contact with a sterilized tumor, cell ablation rupture to suppress metastasis, and tumor agitation during needle tube withdrawal from the body. .

  Furthermore, since the medical device according to the present invention is formed in a needle shape with a thin outer shape, a single patient can be treated at a plurality of locations at the same time, and the therapeutic effect can be enhanced.

  Furthermore, since anyone can treat easily without requiring an expensive and expensive facility or equipment, the treatment cost can be reduced.

DESCRIPTION OF SYMBOLS 10 Medical instrument 11 Needle tube 12 Needle body 13 Chemical solution injection hole 14 Heating element 15 Insulation part 20 Medical instrument 21 Chemical solution injection hole 30 Medical instrument 31 Needle tube 32 Needle body 33 Insulation part 34 Heating element

Claims (4)

Formed by a conductive cylindrical member connected to one of the positive electrode and the negative electrode, a needle tube having a chemical injection hole on the side surface of the tip;
An electrically conductive needle-like member is provided that can be inserted into the inside of the needle tube from the base end side, and is connected to an electrode opposite to the needle tube, and an insulating portion is formed on the outer peripheral surface that contacts the inner surface of the needle tube Needle body,
A heating element having a predetermined heating resistance provided so as to be able to close the distal end side opening of the needle tube and to be in contact with the distal end of the needle body;
When the needle body is inserted into the needle tube from the base end side and the tip of the needle body is brought into contact with the heating element, the needle body and the needle tube are energized through the heating element. It is comprised in the medical device characterized by the above-mentioned.   The medical device according to claim 1, wherein the drug solution injection hole is formed so that a distal end portion of the needle body can enter and exit from the needle tube. A needle tube formed by a conductive cylindrical member connected to one of the positive electrode and the negative electrode;
An electrically conductive needle-like member is provided that can be inserted into the inside of the needle tube from the base end side, and is connected to an electrode opposite to the needle tube, and an insulating portion is formed on the outer peripheral surface that contacts the inner surface of the needle tube Needle body,
A heating element having a predetermined heating resistance provided at at least one of the tip of the needle tube and the tip of the needle body;
And when the needle body is inserted into the needle tube from the proximal end side, the needle body and the needle tube come into contact with each other via the heating element and are energized. Instruments.   The medical instrument according to any one of claims 1 to 3, wherein the needle tube and the needle body are formed of a flexible material.

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