WO2014148590A1 - 電熱ヒータおよびその製造方法 - Google Patents
電熱ヒータおよびその製造方法 Download PDFInfo
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- WO2014148590A1 WO2014148590A1 PCT/JP2014/057657 JP2014057657W WO2014148590A1 WO 2014148590 A1 WO2014148590 A1 WO 2014148590A1 JP 2014057657 W JP2014057657 W JP 2014057657W WO 2014148590 A1 WO2014148590 A1 WO 2014148590A1
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- WIPO (PCT)
- Prior art keywords
- transfer tube
- heat transfer
- electric heater
- heat generating
- generating portion
- Prior art date
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/08—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by means of electrically-heated probes
- A61B18/082—Probes or electrodes therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/02—Apparatus or processes specially adapted for manufacturing resistors adapted for manufacturing resistors with envelope or housing
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/0014—Devices wherein the heating current flows through particular resistances
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
- H05B3/52—Apparatus or processes for filling or compressing insulating material in tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00059—Material properties
- A61B2018/00071—Electrical conductivity
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00059—Material properties
- A61B2018/00071—Electrical conductivity
- A61B2018/00083—Electrical conductivity low, i.e. electrically insulating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00059—Material properties
- A61B2018/00089—Thermal conductivity
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00107—Coatings on the energy applicator
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00595—Cauterization
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00773—Sensed parameters
- A61B2018/00791—Temperature
- A61B2018/00821—Temperature measured by a thermocouple
Definitions
- the present invention relates to an electric heater and a method for manufacturing the same, and more particularly to an electric heater suitable for housing in a minute space such as the inside of a puncture needle for puncturing a living body and a method for manufacturing the same.
- the electric heating needle disclosed in Patent Document 1 is configured such that a heating element and a thermocouple are accommodated in a hollow pipe whose tip is closed by a tip that can puncture a living body.
- the heating element is formed by winding a thin heating wire in a coil shape around a core made of glass fiber yarn, the distal end side inserted into the hollow pipe is folded in half, and the proximal end side is connected via a connector. Connected to the insulated wire.
- the diameter of the heating element is reduced, while the connection between the heating element and the covered electric wire is made via a connector provided outside the hollow pipe.
- the length of the heating element inevitably increases. Therefore, there is a problem that it is difficult to efficiently heat only the vicinity of the lesion site locally.
- an object of the present invention is to provide an electric heater that can be locally heated by being inserted into a narrow space and a method for manufacturing the same.
- the object of the present invention is an electric heater in which a linear heater main body is accommodated in a heat transfer tube, and the heater main body has a pair of end portions led out from one end side of the heat transfer tube.
- An electric heater having a folded portion in the tube, and a heat generating portion formed along a part of the heat transfer tube, and a lead portion that can electrically connect the heat generating portion to the outside of the heat transfer tube Is achieved.
- the heater body covers a part of the surface of a linear body made of a metal material having a high electric resistivity with a covering made of a metal material having an electric resistivity lower than that of the material of the linear body.
- the part that has been formed can be used as the lead part, and the part where the linear body is exposed can be used as the heat generating part.
- the folded portion is preferably formed in the heat generating portion.
- the heat generating portion is covered with an exterior body, and at least a part thereof is in contact with the inner peripheral surface of the heat transfer tube via the exterior body.
- the ratio of the axial length of the portion where the heat generating portion contacts the heat transfer tube to the total length of the heat generating portion is preferably 0.1 to 1.
- the said heat generating part contacts the said heat exchanger tube in several places, or it is preferable that the said heat generating part contacts the said heat exchanger tube on both sides which pinched
- the heat generating part is preferably made of a shape memory alloy or a high tensile wire.
- the heat transfer tube is preferably open at both ends and filled with sealing resin.
- the sealing resin is preferably an epoxy resin.
- the heat transfer tube preferably has an outer diameter of 0.2 to 0.7 mm.
- the average value of the gap generated between the heat generating part and the heat transfer tube is preferably 0 to 0.1 mm.
- the ratio of these resistance values is preferably 20 or more.
- the heater body includes an inner conductor and an outer conductor that are coaxially arranged via an insulator, and the folded portion is formed by conducting the inner conductor and the outer conductor at an end portion. be able to.
- the heat generating portion can be formed by making a part of the outer conductor a high resistance portion along the axis.
- Each of the electric heaters preferably further includes a temperature detection element that detects a temperature in the vicinity of the heating element in the heat transfer tube, and a temperature measuring unit of the temperature detection element is in contact with an inner peripheral surface of the heat transfer tube. It is preferable.
- Another object of the present invention is a method for manufacturing the above-described electric heater, wherein a part of the surface of a linear body made of a high-resistance metal material has a lower electrical resistivity than the material of the linear body.
- the portion where the linear body is covered with the low-resistance metal material constitutes the lead portion, and the portion where the linear body is exposed constitutes the electric heater manufacturing method constituting the heat generating portion.
- the heat generating portion is preferably formed of a high-strength wire and covered with an exterior body, and the second step is performed when the heat generating portion is curved. It is preferable that the heat generating part is brought into close contact with the inner peripheral surface of the heat transfer tube via the outer package by an elastic force.
- the heat generating part is preferably formed of a shape memory alloy and covered with an exterior body, and the second step is performed by heat-deforming after the heat generating part is accommodated in the heat transfer tube. It is preferable that the heat generating part is brought into close contact with the inner peripheral surface of the heat transfer tube via the exterior body.
- an electric heater that can be locally heated by being inserted into a narrow space, and a method for manufacturing the same.
- FIG. 2 is a cross-sectional view taken along the line AA in FIG.
- FIG. 3 is a B1-B1 sectional view of FIG. 2.
- FIG. 6 is a B2-B2 sectional view of FIG. 5.
- It is a perspective view which shows typically the principal part of the electric heater which concerns on the 2nd Embodiment of this invention.
- It is sectional drawing which shows the modification of the electric heater shown in FIG. It is a disassembled perspective view which shows one Embodiment in the case of applying the electric heater of this invention to a biological treatment instrument.
- FIG. 1 is a plan view of an electric heater according to the first embodiment of the present invention
- FIGS. 2 and 3 are cross-sectional views taken along the lines AA and B1-B1 of FIG. 1, respectively.
- the electric heater 1 is configured such that a linear heater body 20 is accommodated in a heat transfer tube 10.
- the heat transfer tube 10 is made of a material having good thermal conductivity (for example, a metal material such as stainless steel or copper), and has openings 11 and 12 at both ends.
- the thickness of the heat transfer tube 10 is not particularly limited, for example, an ultra-thin tube having an outer diameter of about 0.3 mm can be used.
- the heat transfer tube 10 is preferably self-supporting and flexible so that it can be easily inserted into a narrow space.
- the heater body 20 has a heat generating part 25 and a lead part 26 connected in the longitudinal direction, and the folded part 24 is formed by bending at any part of the heat generating part 25 and the lead part 26.
- the heater body 20 is formed by coating a part of the surface of a linear body made of a metal material having a high electrical resistivity with a metal plating film or a metal foil made of a metal material having an electrical resistivity lower than that of the linear body.
- a portion that can be manufactured and covered with a linear body by a covering made of a low-resistance metal material constitutes the lead portion 26, and a portion where the linear body is exposed constitutes the heat generating portion 25.
- the heat generating portion 25 and the lead portion 26 can be formed easily and reliably.
- the position of the heat generating portion 25 in the heater body 20 is not particularly limited, and may be formed not only in one place but in a plurality of places. However, as will be described later, at least the folded portion that is the tip portion of the heater body 20 When the part 24 is formed in the heat generating part 25, it is preferable that the heat generating part 25 can be accurately aligned in the living body.
- the manufacturing method of the heater body 20 is not limited to the above. For example, a heating part made of a linear member is arranged between a plurality of lead parts made of a cylindrical member, and both ends of the heating part are connected to each lead. It is also possible to configure the heater main body by caulking and fixing to the opening end of each part.
- Examples of the high-resistance metal material of the striatum constituting the heat generating portion 25 include nickel, iron, platinum, chromium, titanium, and alloys thereof (stainless steel, nichrome, etc.).
- the linear body is preferably a single wire for thinning, but may be a single wire twisted together.
- examples of the low-resistance metal material of the covering body that covers the wire body and constitutes the lead portion 26 include gold, silver, copper, aluminum, and alloys thereof.
- the heat generating part 25 and the lead part 26 are covered with an exterior body 28.
- the outer package 28 is preferably excellent in thermal conductivity, heat resistance, and electrical insulation, and in this embodiment, a polyimide resin is used.
- a fluorine resin, an olefin resin, a polystyrene resin examples thereof include polyester resins, polyurethane resins, ABS resins, and polymer alloys of polyamide resins and ABS resins.
- the exterior body 28 can be formed by a tube or a coating that covers the heat generating portion 25 and the lead portion 26. When the thickness of the outer package 28 is too large, the thermal conductivity is lowered. On the other hand, when the thickness is too small, the electrical insulating property is easily lowered.
- the heater body 20 is arranged such that a pair of end portions 26 a and 26 b of the lead wire 26 is led out from the opening 11 on one end side of the heat transfer tube 10, and the folded portion 24 is on the other end side in the heat transfer tube 10. It is arrange
- the heater body 20 is adjusted by inserting a pair of end portions 26a and 26b from the opening 12 on the other end side of the heat transfer tube 10 and pulling out the opening 11 on the one end side with the folded portion 24 formed in advance. The positioning of the folded portion 24 in the heat transfer tube 10 can be easily performed.
- the pair of end portions 26 a and 26 b of the heater body 20 are connected to the connection cord 42 via a power supply line (not shown) in the sleeve 40 attached to the end portion of the heat transfer tube 10.
- the connection cord 42 can be connected to a power supply device (not shown).
- the heat generating part 25 can be electrically connected to the outside of the heat transfer tube 10 via the lead wire 26.
- a temperature detection element 30 such as a thermocouple is accommodated in the heat transfer tube 10.
- the temperature detecting element 30 is inserted into the heat transfer tube 10 from the opening 11 on one end side, and a temperature measuring portion (not shown) on the tip end side is disposed in the vicinity of the heat generating portion 25 of the heater body 20.
- the temperature detection element 30 is also connected to the connection cord 42 in the sleeve 40.
- a sealing resin 14 is filled in a gap formed between the inner surface of the heat transfer tube 10 and the heater body 20 and the temperature detection element 30.
- the sealing resin 14 preferably has good thermal conductivity.
- an epoxy resin, an imide resin, a silicon resin, a fluorine resin, or the like can be suitably used.
- the epoxy resin can be easily filled into the heat transfer tube 10 by selecting a low-viscosity resin, and also has good thermal conductivity (about 10 times that of air) and high heat resistance. Since the heat resistance temperature is about 200 ° C. and the shrinkage at the time of curing is small, it can be suitably used as the sealing resin 14.
- the thermal conductivity can be further improved by adding an additive such as alumina or silica to the sealing resin 14.
- the gap between the heat transfer tubes 10 is filled with a resin solution having a low viscosity, using a capillary phenomenon, and then solidifying. It can be carried out.
- the sealing resin 14 can be pressurized and injected into the heat transfer tube 10.
- the heat transfer tube 10 may be filled with a filler other than resin.
- the filler preferably has a higher thermal conductivity than air.
- metal or ceramics can be used, and the filler is solid (powder, granular) or liquid regardless of the shape. May be.
- the heat transfer tube 10 one in which one end is closed can be used.
- the heat generating portion 25 is formed along a part of the heat transfer tube 10 in a state in which the heater main body 20 is accommodated in the heat transfer tube 10.
- a desired temperature distribution can be generated along the direction, and the object to be heated can be efficiently heated locally.
- the extension of the lead portion 26 that connects the heat generating portion 25 to the outside of the heat transfer tube 10 makes it possible to easily lengthen the heat transfer tube 10, so that it is easy even in a space with a small opening and a long depth, such as an injection needle, for example. And only the affected part can be selectively heated.
- FIGS. 2 and 3 show an example of a configuration in which the heater body 20 is not in contact with the inner surface of the heat transfer tube 10, but at least a part of the heat generating portion 25 of the heater body 20. Is preferably in contact with the inner surface of the heat transfer tube 10.
- FIG. 4 is a cross-sectional view illustrating an example of a configuration in which the heat generating unit 25 is in contact with the inner surface of the heat transfer tube 20.
- the electric heater 1 shown in FIG. 4 is configured such that a part of the heat generating portion 25 is heat-transferred via the exterior body 28 by increasing the curvature radius when the heater body 20 is bent by the heat generating portion 25 to form the folded portion 24. 10 is in contact with the inner peripheral surface.
- the thermal conductivity can be improved and the object to be heated can be heated more efficiently. it can.
- the positioning accuracy of the heat generating portion 25 in the heat transfer tube 10 can be improved, and a stable heating effect is obtained by suppressing variation in heating performance for each product. be able to.
- the edge portion of the opening 12 of the heat transfer tube 10 may be rounded (or chamfered) 12a so that the heat generating portion 25 having a large curvature radius can be smoothly inserted into the heat transfer tube 10. preferable.
- the heat generating portion 25 is in contact with the inner peripheral surface of the heat transfer tube 10.
- the number of contact points between the heat generating part 25 and the heat transfer tube 10 may be one, it is preferable to be at a plurality of points. This makes it easy to hold the heat generating part 25 in the heat transfer tube 10.
- the locations where the heat generating portion 25 contacts the heat transfer tube 10 are preferably on both sides of the folded portion 24 as in this embodiment, but may be other locations.
- the folded portion 24 is preferably formed on the heat generating portion 25, and the heat generating portion 25 can be easily brought into contact with the heat transfer tube 10 by utilizing the deformation of the heat generating portion 25 for forming the folded portion 24.
- the axial length of the portion where the heat generating portion 25 contacts the heat transfer tube 10 is as large as possible in order to efficiently transfer heat to the object to be heated.
- the ratio (C1 + C2) / L of the total axial length (C1 + C2) of the portion where the heat generating portion 25 contacts the heat transfer tube 10 via the outer body 28 to the total length L of the heat generating portion 25 is 0. It is preferably 1 to 1, more preferably 0.3 to 1, and still more preferably 0.5 to 1.
- the contact length between the heat generating portion 25 and the heat transfer tube 10 can be measured using, for example, X-rays.
- the total length L in the axial direction of the heat generating portion 25 may be determined in consideration of the size of the heated region, and is not particularly limited, but is, for example, about 1 to 30 mm.
- the gap g generated between the heat generating portion 25 and the inner peripheral surface of the heat transfer tube 10 is as small as possible so that the heat transfer portion 25 does not contact the heat transfer tube 10 in order to suppress heat transfer loss to the outside.
- the average value of the gap g is preferably 0 to 0.1 mm.
- the average value of the gap g is 10 cross sections extracted from the substantially entire portion of the heat generating portion 25 excluding the folded portion 24 at a constant interval, and the outer peripheral surface of the exterior body 28 covering the heat generating portion 25 and the heat transfer tube 10. It can be obtained from the arithmetic average of the minimum distance to the inner peripheral surface.
- the portion where the heat generating portion 25 does not come into contact with the heat transfer tube 10 may be covered in advance with a heat insulating material or the like.
- a configuration in which the sealing resin 14 is not filled can be employed.
- the heat generating portion 25 may be configured not to contact the heat transfer tube 10 at all.
- the gap generated between the lead portion 26 and the inner peripheral surface of the heat transfer tube 10 is preferably as large as possible.
- the filling of the sealing resin 14 into the heat transfer tube 10 may be only part of the extent to cover the heat generating portion 25, and the periphery of the lead portion 26 may be an air layer. Since the heater main body 20 mainly generates heat in the heat generating portion 25, this configuration can reduce the amount of the sealing resin 14 used while maintaining good heating performance.
- a mesh plate or the like through which air can pass is interposed between the heat generating portion 25 and the lead portion 26, and the sealing resin 14 is made into a capillary phenomenon or A method of blocking the sealing resin 14 with a mesh plate when filling the heat transfer tube 10 by pressurization can be exemplified.
- the heat generating portion 25 is a Ni-Ti (nickel / titanium) alloy or iron / manganese / silicon alloy that has been subjected to shape memory heat treatment so as to be heat-deformed by energization or the like and to adhere to the inner peripheral surface of the heat transfer tube 10 You may form with shape memory alloys, such as.
- the heat generating portion 25 is formed of a high-strength wire such as stainless steel wire, piano wire, tungsten wire, nichrome wire, and the heat generating portion 25 is brought into close contact with the heat transfer tube 10 by the elastic force when the heat generating portion 25 is bent. You may comprise.
- the tensile strength of the high tensile wire is preferably 800 MPa or more.
- the heat generating part 25 by forming the heat generating part 25 with a shape memory alloy or a high tensile wire, at least a part of the heat generating part 25 can be easily and reliably adhered to the heat transfer tube 10 and the heat generating part 25 is connected to the heat transfer tube. Since it can hold
- the thickness of the suitable linear body cannot be obtained, and it becomes difficult to secure the insertion space and the heat generation amount of the heater body 20.
- the thickness is preferably 0.2 to 0.7 mm, and preferably 0.3 to 0.6 mm. Is more preferable, and 0.3 to 0.5 mm is even more preferable.
- the thickness t1 of the heat transfer tube 10 is preferably as thin as possible because the heat conduction efficiency is improved. However, if the thickness is too thin, it is difficult to ensure the strength against bending deformation at the time of puncturing. It is preferably about 0.03 to 0.04 mm.
- the linear body constituting the heat generating portion 25 is preferably high resistance, while the covering body covering the linear body and constituting the lead portion 26 is preferably low resistance.
- the resistance values per unit length along the axial direction of the linear body and the covering body are R1 and R2, respectively, as the ratio of these resistance values (R1 / R2) is increased,
- the heat generating part 25 can be efficiently heated.
- the ratio of the resistance values (R1 / R2) is preferably 20 or more.
- the linear body is made of SUS304 (electric resistivity: 7.92 ⁇ 10 ⁇ 7 ⁇ m) and has a diameter of 100 ⁇ m
- the covering body is copper (electrical resistivity: 1.68 ⁇ 10 ⁇ 8 ⁇ m).
- the above-described resistance ratio (R1 / R2) is about 20.7.
- the upper limit of the ratio of resistance values (R1 / R2) does not exist in particular, but is practically 50, for example.
- FIG. 5 is a cross-sectional view of an electric heater 1 ′ according to the second embodiment of the present invention.
- 6 is a cross-sectional view taken along the line B2-B2 of FIG. 5 and 6, the same components as those in FIGS. 2 and 3 are denoted by the same reference numerals.
- the heater body 20 in which the heat generating portion 25 and the lead portion 26 are connected along the longitudinal direction is bent to form the folded portion 24.
- the electric heater 1 ′ can also be configured by using the heater body 20 ′ in which the inner conductor 22 and the outer conductor 23 are arranged coaxially with the insulator 21 interposed therebetween.
- the heater body 20 ' is formed in a linear shape as a whole.
- the inner conductor 22 located in the center is made of a wire, and can be made of a metal material having a low electrical resistivity, such as gold, silver, copper, aluminum, or an alloy thereof.
- the inner conductor 22 is preferably a single wire for thinning, but may be a single wire twisted together.
- the insulator 21 can be formed from a material having high electrical insulation properties such as a fluorine resin, an olefin resin, a polystyrene resin, a polyester resin, a polyurethane resin, a polyimide resin, and an ABS resin.
- a polyamide resin And a polymer alloy of ABS resin can be preferably used.
- the insulator 21 may be in the form of a tube that covers the inner conductor 22, but is preferably formed by coating in order to make the thickness extremely thin (for example, about 0.04 mm).
- the outer conductor 23 is provided on the entire outer peripheral surface of the insulator 21.
- the outer conductor 23 is also preferably thin.
- the outer conductor 23 can be formed of a metal plating film obtained by plating the insulator 21 with a metal material or a metal foil wound and bonded to the insulator 21.
- the entire outer conductor 23 is covered with an exterior body 28 as in the first embodiment.
- a part of the outer conductor 23 is a high resistance portion 23a along the axis of the heater body 20 ', so that a heat generating portion 25' is formed.
- a portion of the external conductor 23 other than the high resistance portion 23a (that is, the heat generating portion 25 ') is a low resistance portion 23b, and this low resistance portion 23b constitutes a lead portion 26' together with the internal conductor 22.
- the high resistance portion 23a is formed such that the electrical resistance value per unit length along the axis is higher than that of the low resistance portion 23b.
- the thickness of the high resistance portion 23a may be smaller than the thickness of the low resistance portion 23b.
- the metal plating on the insulator 21 is partially repeated to generate a thickness distribution of the plating film, or the metal foil is wound by partially changing the number of times of winding of the metal foil wound around the insulator 21.
- the high resistance portion 23a and the low resistance portion 23b can be formed.
- the electrical resistivity of the metal material of the high resistance portion 23a is higher than the electrical resistivity of the metal material of the low resistance portion 23b. It is preferable.
- the material of the high resistance portion 23a is nickel, iron, platinum, Chromium, titanium, and alloys thereof (stainless steel, nichrome, etc.) can be used.
- the high resistance portion 23a and the low resistance portion 23b may be formed by a combination of the above-described different thicknesses and different metal materials.
- a high-resistance metal plating film P ⁇ b> 1 made of a metal material having a high electrical resistivity such as nickel is formed on the entire outer peripheral surface of the insulator 21 covering the inner conductor 22 to form a linear shape.
- a part of the high resistance metal plating film P1 is covered with a low resistance metal plating film P2 made of a metal material having a low electrical resistivity such as copper.
- the low resistance portion 23b on which the low resistance metal plating film P2 is formed constitutes the lead portion 26 '
- the high resistance portion 23a where the high resistance metal plating film P1 is exposed constitutes the heat generating portion 25'.
- the exposed portion of the high-resistance metal plating film P1 can also be formed by etching the low-resistance metal plating film P2 after covering the entire high-resistance metal plating film P1 with the low-resistance metal plating film P2.
- the heater body 20 ′ having the configuration shown in FIG. 7 can be formed using a metal foil instead of the metal plating film.
- the heater main body 20 ′ After the high resistance metal foil is wound around the insulator 21, the heater main body 20 ′ It can be easily manufactured by partially wrapping a resistive metal foil.
- the lead portion 26 ′ can be formed of a low resistance metal wire in addition to the above-described plating film or metal foil. Examples of the metal wire include a round wire and a flat wire.
- the heat generating portion 25 ′ is formed at the end of the external conductor 23, but it may be formed at the center of the external conductor 23, and the position where the heat generating portion 25 ′ is formed is not particularly limited. Absent. Further, the heat generating portion 25 ′ may be intermittently formed at a plurality of locations along the axis of the heater body 20. The heat generating portion 25 ′ may be formed in the entire circumferential direction at each position along the axis of the heater body 20, or may be formed only in a part in the circumferential direction. When the heat generating portion 25 ′ is formed in a part in the circumferential direction, a spiral plating film or the like may be used, and the length of the heat generating portion 25 necessary for heating the object to be heated can be easily ensured.
- the inner conductor 22 is electrically connected to the outer conductor 23 at the tip portion, thereby forming a folded portion 24 ′ where the energization path is folded.
- the folded portion 24 ′ can be formed by extending the high resistance metal plating film P ⁇ b> 1 to the end face of the internal conductor 22 when the heat generating portion 25 ′ is formed by the high resistance metal plating film P ⁇ b> 1.
- the conduction between the inner conductor 22 and the outer conductor 23 can be performed by wire bonding, application of a conductive resin or conductive adhesive, or through a through hole formed in the insulator 21. Can also be done.
- the temperature detection element 30 is accommodated in the heat transfer tube 10, and a gap formed between the inner surface of the heat transfer tube 10 and the heater body 20 and the temperature detection element 30. Is filled with a sealing resin 14.
- the temperature detection element 30 includes a temperature measuring unit 31 at the tip, and is inserted into the heat transfer tube 10 from the opening 11 on one end side, and the temperature measuring unit 31 is disposed in the vicinity of the heat generating unit 25 of the heater body 20. .
- a proximal end side of the temperature detection element 30 is connected to a connection cord 42 in the sleeve 40.
- the temperature measuring unit 31 is preferably in contact with the inner peripheral surface of the heat transfer tube 10 in the vicinity of the heat generating unit 25. According to this configuration, since the heat conductivity of the heat transfer tube 10 is good, a temperature close to the temperature of the object to be heated in the vicinity of the outer periphery of the heat transfer tube 10 can be measured. It can be done accurately.
- the electric heater 1 ′ having the above-described configuration is similar to the electric heater 1 according to the first embodiment in that the heater body 25 ′ is housed in the heat transfer tube 10 and the heat generating portion 25 is part of the heat transfer tube 10. Since it forms so that it may follow, it becomes possible to produce desired temperature distribution along the longitudinal direction of the heat exchanger tube 10, and to-be-heated material can be heated locally efficiently.
- the heater main body 20 ′ is configured to include the inner conductor 22 and the outer conductor 23 arranged coaxially, and a part of the outer conductor 23 is formed along the axis as the high resistance portion 23a to form the heat generating portion 25.
- the heater main body 20 ′ can be made compact, and the diameter of the electric heater 1 can be reduced while increasing the design margin of the heat transfer tube 10.
- the outer conductor 23 constituting the lead portion 26 can be formed of a metal plating film or a metal foil, the heater body 20 and the electric heater 10 can be more easily reduced in diameter.
- the heat transfer tube 10 has openings 11 and 12 formed at both ends and is filled with the sealing resin 14, the gap in the heat transfer tube 10 can be easily sealed to prevent foreign matter from entering, and the heater body
- the heat generating part 25 ′ of 20 ′ and the temperature measuring part 31 of the temperature detecting element 30 can be reliably fixed at a desired position. Further, by using a material having good thermal conductivity as the sealing resin 14, the non-heated material can be efficiently heated. It is also possible to fill the heat transfer tube 10 with a filler other than resin as described above.
- the electric heater 1 ′ of the second embodiment can also be configured such that the heat generating portion 25 ′ is in contact with the inner peripheral surface of the heat transfer tube 10 as shown in FIG. 8.
- the heat generating portion 25 ′ is curved, and the base end side and the distal end side of the heat generating portion 25 ′ are in contact with the inner peripheral surface of the heat transfer tube 10, respectively. It is positioned and held in the heat tube 10.
- the dimensions of each part described for the electric heater 1 shown in FIG. 4 can be applied to the same configuration of the electric heater 1 ′ shown in FIG. 8.
- FIG. 9 is an exploded cross-sectional view showing an embodiment when used in a living body heating apparatus for heating a diseased part of a living body as a suitable use example of the electric heater of the present invention.
- a living body heating instrument 100 shown in FIG. 9 includes a hollow puncture needle 110 having a puncture portion 112 at the tip and openings at both ends, and an electric heater 1 that is detachably inserted into the puncture needle 110.
- the electric heater 1 has a heater body housed inside the heat transfer tube 10, and the structure thereof is the same as that of the electric heaters 1, 1 ′ of the first embodiment or the second embodiment described above. Detailed description is omitted.
- the tip portion sealed with resin in the heat transfer tube 10 is tapered to match the shape of the puncture portion 112 of the puncture needle 110, and is polished.
- the sleeve 40 provided on the proximal end side of the heat transfer tube 10 can be attached to a mounting portion 114 provided on the proximal end side of the puncture needle 110, and by inserting the heat transfer tube 10 into the puncture needle 110,
- the electric heater 1 is positioned and fixed with respect to the puncture needle 110.
- the heat generating portion 25 of the electric heater 1 is provided so as to be positioned in the vicinity of the puncture portion 112 when inserted into the puncture needle 110.
- the size of the puncture needle 110 is not particularly limited.
- the inner diameter is about 0.4 mm and the length is about 150 mm, and the electric heater 1 can be inserted into the hollow portion of the puncture needle 110. Thickness and length are set.
- the living body heating instrument 100 having the above-described configuration has a negative effect on a healthy part by puncturing the living body such as a human body or an animal with the puncture needle 110 in a state where the electric heater 1 is attached to the puncture needle 110. Only the lesion site such as cancer cells can be selectively heated, and effective treatment can be performed.
- the heating temperature by the electric heater 1 is not particularly limited, but the surface temperature of the heat transfer tube 10 in the vicinity of the heat generating portion 25 is preferably about 50 to 60 ° C. After the cauterization treatment, by removing only the electric heater 1 while the puncture needle 110 is punctured into the living body, it becomes possible to supply a drug or the like from the distal end portion 112 of the puncture needle 110 to the lesion site.
- the inner surface of the puncture needle 110 and the outer surface of the heat transfer tube 10 are previously subjected to water repellent treatment or the like. It is preferable.
- the electric heater 1 itself can be used as a puncture needle by forming the tip of the heat transfer tube 10 into a sharp needle shape.
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Abstract
Description
10 伝熱管
11,12 開口
14 封止樹脂
20 ヒータ本体
21 絶縁体
22 内部導体
23 外部導体
23a 高抵抗部
23b 低抵抗部
24 折り返し部
25 発熱部
26 リード部
26a,26b 端部
28 外装体
30 温度検出素子
31 測温部
Claims (18)
- 線状のヒータ本体が伝熱管に収容された電熱ヒータであって、
前記ヒータ本体は、一対の端部が前記伝熱管の一端側から導出されるように前記伝熱管内に折り返し部を有しており、前記伝熱管の一部に沿うように形成される発熱部と、前記発熱部を前記伝熱管の外部に電気的に接続可能なリード部とを備える電熱ヒータ。 - 前記ヒータ本体は、電気抵抗率が高い金属材料からなる線状体の表面の一部を、前記線状体の材料よりも電気抵抗率が低い金属材料からなる被覆体で被覆した部分が前記リード部を構成し、前記線状体が露出した部分が前記発熱部を構成する請求項1に記載の電熱ヒータ。
- 前記折り返し部は、前記発熱部に形成されている請求項1または請求項2いずれかに記載の電熱ヒータ。
- 前記発熱部は、外装体により覆われており、少なくとも一部が前記外装体を介して前記伝熱管の内周面に接触する請求項1~3いずれかに記載の電熱ヒータ。
- 前記発熱部が前記伝熱管に接触する部分の軸方向長さの、前記発熱部の全長に対する比が、0.1~1である請求項4に記載の電熱ヒータ。
- 前記発熱部は、複数箇所において前記伝熱管に接触する請求項4に記載の電熱ヒータ。
- 前記発熱部は、前記折り返し部を挟んだ両側において前記伝熱管に接触する請求項4に記載の電熱ヒータ。
- 前記発熱部は、形状記憶合金または高張力線材からなる請求項1~7いずれかに記載の電熱ヒータ。
- 前記伝熱管は、両端が開口されており、内部に封止樹脂が充填されている請求項1~8いずれかに記載の電熱ヒータ。
- 前記封止樹脂は、エポキシ樹脂である請求項9に記載の電熱ヒータ。
- 前記伝熱管は、外径が0.2~0.7mmである請求項1~10いずれかに記載の電熱ヒータ。
- 前記発熱部と前記伝熱管との間に生じるギャップの平均値が0~0.1mmである請求項1~11いずれかに記載の電熱ヒータ。
- 前記線状体および前記被覆体の軸線方向に沿った単位長さあたりの抵抗値をそれぞれR1,R2としたときに、これらの抵抗値の比(R1/R2)が20以上である請求項1~12いずれかに記載の電熱ヒータ。
- 前記ヒータ本体は、絶縁体を介して同軸状に配置される内部導体および外部導体を備え、前記内部導体および前記外部導体が端部において導通されることにより前記折り返し部が形成されており、
前記発熱部は、前記外部導体の一部を軸線に沿って高抵抗部とすることにより形成されている請求項1に記載の電熱ヒータ。 - 前記伝熱管内における前記発熱体近傍の温度を検出する温度検出素子を更に備え、前記温度検出素子の測温部が前記伝熱管の内周面に接触している請求項1~14いずれかに記載の電熱ヒータ。
- 請求項1に記載の電熱ヒータを製造する方法であって、
高抵抗金属材料からなる線状体の表面の一部を、前記線状体の材料よりも電気抵抗率が低い低抵抗金属材料で被覆すると共に、前記線状体に前記折り返し部を形成して前記ヒータ本体を製造する第1の工程と、
前記ヒータ本体を前記伝熱管に収容する第2の工程とを備え、
前記線状体が前記低抵抗金属材料で被覆された部分が前記リード部を構成し、前記線状体が露出した部分が前記発熱部を構成する電熱ヒータの製造方法。 - 前記発熱部は、高張力線材から形成されて、外装体により覆われており、
前記第2の工程は、前記発熱部を湾曲させたときの弾性力によって、前記発熱部を、前記外装体を介して前記伝熱管の内周面に密着させる請求項16に記載の電熱ヒータの製造方法。 - 前記発熱部は、形状記憶合金から形成されて、外装体により覆われており、
前記第2の工程は、前記発熱部を前記伝熱管に収容した後に加熱変形させて、前記発熱部を、前記外装体を介して前記伝熱管の内周面に密着させる請求項16に記載の電熱ヒータの製造方法。
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JP2015506844A JP6341616B2 (ja) | 2013-03-22 | 2014-03-20 | 電熱ヒータおよびその製造方法 |
EP14768654.7A EP2978279A4 (en) | 2013-03-22 | 2014-03-20 | ELECTRIC HEATING ELEMENT AND METHOD FOR MANUFACTURING AN ELECTRIC HEATING ELEMENT |
US14/778,913 US10194489B2 (en) | 2013-03-22 | 2014-03-20 | Electric heater and method for manufacturing electric heater |
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CN109916529A (zh) * | 2019-02-26 | 2019-06-21 | 重庆材料研究院有限公司 | 用于核级铠装铂电阻的铂电阻元件及制备工艺 |
CN110072301A (zh) * | 2019-05-28 | 2019-07-30 | 广东恒美电热科技股份有限公司 | 电热管、电热管的制造方法及电热装置 |
KR20200076761A (ko) * | 2017-11-21 | 2020-06-29 | 와틀로 일렉트릭 매뉴팩츄어링 컴파니 | 일체형 히터 및 그 제조방법 |
WO2020183681A1 (ja) * | 2019-03-13 | 2020-09-17 | オリンパス株式会社 | 医療用ヒータ及び処置具 |
WO2020183680A1 (ja) * | 2019-03-13 | 2020-09-17 | オリンパス株式会社 | 処置具 |
US11083050B2 (en) | 2017-11-21 | 2021-08-03 | Watlow Electric Manufacturing Company | Integrated heater and method of manufacture |
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CN110072301A (zh) * | 2019-05-28 | 2019-07-30 | 广东恒美电热科技股份有限公司 | 电热管、电热管的制造方法及电热装置 |
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EP2978279A4 (en) | 2016-12-21 |
US10194489B2 (en) | 2019-01-29 |
US20160050719A1 (en) | 2016-02-18 |
JPWO2014148590A1 (ja) | 2017-02-16 |
EP2978279A1 (en) | 2016-01-27 |
JP6341616B2 (ja) | 2018-06-13 |
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