CA2619665A1 - Rod type iontophoresis device - Google Patents

Rod type iontophoresis device Download PDF

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Publication number
CA2619665A1
CA2619665A1 CA002619665A CA2619665A CA2619665A1 CA 2619665 A1 CA2619665 A1 CA 2619665A1 CA 002619665 A CA002619665 A CA 002619665A CA 2619665 A CA2619665 A CA 2619665A CA 2619665 A1 CA2619665 A1 CA 2619665A1
Authority
CA
Canada
Prior art keywords
side electrode
working side
electrode assembly
holding portion
working
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002619665A
Other languages
French (fr)
Inventor
Hidero Akiyama
Mizuo Nakayama
Takehiko Matsumura
Akihiko Matsumura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TTI Ellebeau Inc
Original Assignee
Tti Ellebeau, Inc.
Hidero Akiyama
Mizuo Nakayama
Takehiko Matsumura
Akihiko Matsumura
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tti Ellebeau, Inc., Hidero Akiyama, Mizuo Nakayama, Takehiko Matsumura, Akihiko Matsumura filed Critical Tti Ellebeau, Inc.
Publication of CA2619665A1 publication Critical patent/CA2619665A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/20—Applying electric currents by contact electrodes continuous direct currents
    • A61N1/30—Apparatus for iontophoresis, i.e. transfer of media in ionic state by an electromotoric force into the body, or cataphoresis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/20—Applying electric currents by contact electrodes continuous direct currents
    • A61N1/30—Apparatus for iontophoresis, i.e. transfer of media in ionic state by an electromotoric force into the body, or cataphoresis
    • A61N1/303—Constructional details
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0601—Apparatus for use inside the body
    • A61N5/0603—Apparatus for use inside the body for treatment of body cavities
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0601—Apparatus for use inside the body
    • A61N5/0603—Apparatus for use inside the body for treatment of body cavities
    • A61N2005/0606—Mouth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/063—Radiation therapy using light comprising light transmitting means, e.g. optical fibres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/0635—Radiation therapy using light characterised by the body area to be irradiated
    • A61N2005/0643—Applicators, probes irradiating specific body areas in close proximity
    • A61N2005/0644—Handheld applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/065—Light sources therefor
    • A61N2005/0651—Diodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0601—Apparatus for use inside the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0613—Apparatus adapted for a specific treatment
    • A61N5/062—Photodynamic therapy, i.e. excitation of an agent

Abstract

Rod type iontophoresis device (10) comprising retention part (20) and, disposed at a distal end thereof, small working-side electrode structure (12) and non-working-side electrode structure (14). Pin-point infiltration of drug solution can be accomplished by closely adhering first ion exchange membrane (44) and fourth ion exchange membrane (54) provided at the distal end thereof to, for example, the site of skin cancer and carrying out iontophoresis. The working-side electrode structure (12) and non-working-side electrode structure (14) are mounted at a distal end of rodlike member (16), and the rodlike member (16) is freely attachable to or detachable from the distal end of the retention part (20), being replaceable integrally.

Description

Specification ROD TYPE IONTOPHORESIS DEVICE
Technical Field [0001]
The present invention relates to a rod-type iontophoresis device for administering a drug ion to an organism.

Background Art [0002]
Such iontophoresis device as described above is intended for permeating a drug solution into a skin or a mucous membrane, and has been conventionally used for a skin or mucous membrane having a relatively wide area of at least about 20 mm in diameter.
[0003]

On the other hand, in the case of, for example, the therapy/ treatment in an oral cavity such as the therapy ofstomatitis, local anesthesia in an oral cavity, or local anesthesia in odontotherapy, or the therapy of an integument such as melanoma or skin cancer, the direct injection of a drug solution into an affected area as a part (pinpoint) of an organism may increase a therapeutic effect.
[0004]
In such case, one prefers iontophoresis to injection for permeating a drug solution because the iontophoresis is non-invasive.
[0005]

Upon photodynamic therapy (PDT), a photosensitized reactive material is administered and irradiatedwith light,and an anticancer action is expected from the irradiation. However, a patient must be prevented from being irradiated with sunlight because the sensitizer circulates in hisorher body. In addition,thesensitizer may circulate in a portion except an affected area to provide a side effect. Therefore, PDT has demanded the administration of a sensitizer only to an affected area.

Disclosure of the Invention [ 0006]

An object of the present invention is to provide an iontophoresis device suitably used for permeating a drug solution into a part of an organism that can be observed by a doctor from the outside in, for example, local anesthesia in an oral cavity or the therapy of melanoma.

[0007]
The above object can be achieved by the following various examples.

[0008]

(1) A rod-type iontophoresis device including: a working side electrode assembly and a non-working side electrode assembly each used for administering an ionic drug by iontophoresis; and a DC
electric power source connected to the working electrode assembly and the non-working side electrode as semblywith opposite polarities, characterized by including: a rod-like member for supporting the working side electrode assembly and the non-working side electrode assembly; and a bar-like holding portion for detachably supporting the rod-like member, the working side electrode assembly and the non-working side electrode assembly being placed at the tip of the rod-like member,andapredetermined amount of spacing being provided between the working electrode assembly and the non-working electrode assembly.

[0009]

(2) The rod-type iontophoresis device according to the above item (1) , characterized in that the ionic drug is a photosensitized reactive material to be activated by absorbing light, and the holding portion has an irradiation optical system for applying light from the vicinity of the tip of the working side electrode assembly.
[0010]

(3) The rod-type iontophoresis device according to the above item (2), characterized in that the holding portion includes: a light source composed of a light-emitting diode or a laser diode for emittinglighthaving a wavelength sensed by the photosensiti zed reactive material; and an optical fiber for irradiation for introducing light emitted from the light source to the rod-like member or a neighborhood thereof.

[0011]

(4) The rod-type iontophoresis'device according to any one of the above items (1) to (3), characterized in that: the holding portion has an electric power source side working electrode terminal and an electric power source side non-working electrode terminal connected to the DC electric power source with opposite polarities through wiring from the DC electric power source, the wiring being housed in the holding portion; the rod-like member has on a proximal end of a side thereof detachable from the holding portion a working side electrode terminal and a non-working side electrode terminal which are connected to or are separated from the electric power source side working electrode terminal and the electric power source side non-working electrode terminal when attached to or detached from the holding portion; and the working side electrode teriminal and the non-working side electrode terminal are connected to a working side electrode and a non-working side electrode in the working side electrode assembly and the non-working side electrode assembly, respectively.

[0012]
(5) The rod-type iontophoresis device according to the above item (4), characterized in that a controller is provided in the holding portion, the controller being placed in an electric power source circuit between the electric power source side working electrode terminal and the electric power source side non-working electrode terminal and the DC electric power source for adjusting, out of a current value during energization and an energization time as administration time, at least the current value.

[0013]
(6) The rod-type iontophoresis device according to any one of the above items (1) to (5), characterized in that the working side electrode assembly and the non-working side electrode assembly are placed such that central axes thereof are in parallel with each other.

[0014]
(7) The rod-type iontophoresis device according to any one of the above items (1) to (5), characterized in that the working side electrode assembly and the non-working side electrode assembly are placed such that central axes thereof spread out to a tip direction.

[0015]
(8) The rod-type iontophoresis device according to any one of the above items (1) to (5), characterized in that the working side electrode assembly and the non-working side electrode assembly are placed such that central axes thereof intersect each other in a tip direction.

[0016]
(9) The rod-type iontophoresis device according to any one of the above items (1) to (8), characterized in that: the working side electrode assembly includes: the working side electrode connected to the DC electric power source having the same polarity as that of a charged ion of the ionic drug; an electrolyte solution holding portion holding an electrolyte solution, the electrolyte solution holding portion being placed on the front surface of the working side electrode; a second ion exchange membrane selecting an ion having a polarity opposite to that of the charged ion of the ionic drug, the second ion exchange membrane being placed on the front surface of the electrolyte solution holding portion; a drug solution holding portion holding the ionic drug, the drug solution holding portion being placed on the front surface of the second ion exchange membrane; and a first ion exchange membrane which is the ion exchange membrane selecting an ion having the same polarity as that of the charged ion of the ionic drug, the first ion exchange membrane being placed on the front surface of the drug solution holding portion; and the non-working side electrode assembly includes: the non-working side electrode connected to the DC electric power source having a polarity opposite to that of the charged ion of the ionic drug; a second electrolyte solution holding portion holding a second electrolyte solution, the second electrolyte solution holding portion being placed on the front surface of the non-working side electrode; a third ion exchange membrane selecting an ion having the same polarity as that of the charged ion of the ionic drug, the third ion exchange membrane being placed onthefrontsurfaceofthesecondelectrolytesolution holding portion; a third electrolyte solution holding portion holding a third electrolyte solution, the third electrolyte solution holding portion being placed on the front surface of the third ion exchange membrane; and a fourth ion exchange membrane which is the ion exchange membrane selecting an ion having a polarity opposite to that of the charged ion of the ionic drug, the fourth ion exchange membrane being placed on the front surface of the third electrolyte solution holding portion.

Brief Description of the Drawings [0017]

[ Fig . 1] Aplan view showing an iontophoresis device according to an embodiment of the present invention.

[Fig. 2] An enlarged sectional view taken along the line II-II
of Fig. 1.

[Fig. 3] An enlarged sectional view showing a main portion of each of a working side electrode assembly and a non-working side electrode assembly.

[Fig. 4] A plan view showing another placement example of the working side electrode assembly and the non-working side electrode assembly.

[Fig. 5] A plan view showing still another placement example of the working side electrode assembly and the non-working side electrode assembly.

[Fig. 6] An enlarged front view showing a main portion of a rod-type iontophoresis device according to Example 2 of the present invention.

[Fig. 7] A left side view of the rod-type iontophoresis device.
Best Mode for carrying out the Invention [0018]

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
[0019]

As shown in Figs. 1 and 2, a rod-type iontophoresis device 10 according to the best mode is constituted by a working side electrode assembly 12 and a non-working side electrode assembly 14 each used for administering an ionic drug, a rod-like member 16 for integrally supporting them, and a DC electric power source 18 connected to the working side electrode assembly 12 and the non-working side electrode assembly 14 with opposite polarities.
[0020]

The working side electrode assembly 12 and the non-working side electrode assembly 14 are attached to the tip of the rod-like member 16, and the rod-like member 16 is detachably supported by the tip of a bar-like holding portion 20. As a result, the working side electrode assembly 12 and the non-working side electrode assembly 14 are exchangeable integrally with the rod-like member 16. A proximal end portion of the holding portion 20 opposite to the rod-like member 16 serves as a gripping portion 21 having a diameter large enough to be gripped by a human hand.

[0021]
The holding portion 20 has an irradiation optical system 26 including: an irradiation light source 22 composed of a light-emittingdiode (LED) or a laserdiodepresent inside the system;
and an optical fiber 24 for irradiation for introducing light emitted from the irradiation light source 22 to a neighborhood of the rod-like member 16. As shown in Fig. 2, the optical fiber 24 for irradiation is placed such that a tip thereof is adjacent to the rod-like member 16, and is adapted to emit, from the tip, irradiation light with which an affected area or the like of an organism at a position with which the working side electrode assembly 12 can contact is irradiated.

[0022]
The working side electrode assembly 12 and the non-working side electrode assembly 14 are connected to different polarities of the DC electric power source 18 through an electric power source circuit 28. The irradiation light source 22 is also connected to the DC electric power source 18 through a switch 23.

[0023]

An end portion of the rod-like member 16 on the side of the holding portion 20 is provided with a working side electrode terminal 32 to be connected to the working side electrode assembly 12 and a non-working side electrode terminal 34 to be connected to the non-working side electrode assembly 14.

[0024]
Theworking electrode terminal 32 and the non-working electrode terminal 34 are adapted to be connected to an electric power source side working electrode terminal 33 and an electric power source side non-working electrode terminal 35 on the side of the holding portion 20, respectively, when the rod-like member 16 is attached to the holding portion 20.

[0025]
The electric power source side working electrode terminal 33 and the electric power source side non-working electrode terminal 35 are further connected to the DC electric power source 30 placed outside through the electric power source circuit 28.

[0026]
The rod-like member 16 is a cylindrical member having a diameter smaller than that of the tip of the holding portion 20, and is adapted to be capable of: being attached by being threaded with a male screw portion 16A into a female screw portion 20A at the tip of the holding portion 20; and being detached by being rotated in the opposite direction.

[0027]
Fig. 3 is an enlarged view showing that the working side electrode assembly 12 and the non-working side electrode assembly 14 are placed such that central axes thereof are in parallel with each other. In addition, the working side electrode assembly 12 is constituted by laminating a working side electrode 36, an electrolyte solution holding portion 38, a second ion exchange membrane 40, a drug solution holding portion 42, and a first ion exchange membrane 44 in this order from the side of the rod-like member 16, and is formed into a disk shape of about 2 to 6 mm in diameter.

[0028]
The working side electrode 36 is desirably constituted by a conductive paint applied to one surface of a base sheet 13 and blended with a nonmetal conductive filler such as a carbon paste. Theworking side electrode 36 can be constituted by a copper plate or a metal thin film, but a metal eluted from the plate or the thin film may transfer to an organism upon administration of a drug. Therefore, the working side electrode 36 is preferably nonmetallic.

[0029]
The electrolyte solution holding portion 38 is constituted by, for example, an electrolytic paint applied to the working side electrode 36. The electrolytic paint is a paint containing an electrolyte, and an electrolyte that is oxidized or reduced more easily than the electrolytic reaction of water (oxidation on a positive pole and reduction on a negative pole) is particularly preferably used. Examples of such electrolyte include: medical agents such as ascorbic acid (vitamin C) and sodium ascorbate; and organic acids such as lactic acid, oxalic acid, malic acid, succinic acid, and fumaric acid and/or salts thereof. The use of such electrolyte can suppress the generation of an oxygen gas or a hydrogen gas. In addition, blending multiple kinds of electrolytes serving as a combination of buffer electrolyte solutions when dissolved in a solvent can suppress a change in pH during energization.
[0030]

The electrolytic paint is blended with a hydrophilic polymer such as polyvinyl alcohol, polyacrylic acid, polyacrylamide, or polyethylene glycol in order to improve the application property and film-forming property of the paint, and is blended with an appropriate amount of solvent such as water, ethanol, or propanol for adjusting the viscosity of the electrolytic paint. The paint may be blended with an appropriate additional component such as a thickener, a thixotropic agent, a defoaming agent, a pigment, a flavor, or a coloring agent.

[0031]
The second ion exchange membrane 40 is formed by applying a second ion exchange paint to the electrolyte solution holding portion 38.

[0032]
The second ion exchange paint is a paint containing an ion exchange resin into which an ion exchange group using, as a counter ion, an ion having a conductivity type opposite to that of a drug ion in the drug solution holding portion 42 to be described later is introduced. In the case where a drug whose drug component dissociates to plus drug ions is used in the drug solution holding portion 42, the paint is blended with an anion exchange resin. On the other hand, in the case where a drug whose drug component dissociates to minus drug ions is used, the paint is blended with a cation exchange resin.

[0033]
The drug solution holding portion 42 is composed of a drug paint applied to the second ion exchange membrane 40. The paint is a paint containing a drug (including a precursor for the drug) whose drug component dissociates to plus or minus ions (drug ions) as a result of, for example, dissolution into a solvent such as water. Examples of a drug whose drug component dissociates to plus ions include lidocaine hydrochloride as an anesthetic drug and morphine hydrochloride as an anesthetic drug. Examples of a drug whose drug component dissociates to minus ions include ascorbic acid as a vitamin agent.

[0034]
The first ion exchange membrane 44 is formed of a first ion exchange paint applied to the drug solution holding portion 42.
The first ion exchange paint is a paint containing an ion exchange resin into which an ion exchange group using, as a counter ion, an ion having the same conductivity type as that of the drug ion in the drug solution holding portion 42 is introduced. In the case where a drug whose drug component dissociates to plus/minus drug ions is used in the drug solution holding portion 42, the paint is blended with an anion/cation exchange resin.

[0035]

An ionexchange resin obtained by introducing a cation exchange group (an exchange group using a cation as a counter ion) such as a sulfonic group, a carboxylic group, or a phosphoric group into a polymer having a three-dimensional network structure such as a hydrocarbon-based resin (for example, a polystyrene resin or an acrylic resin) or a fluorine-based resin having a perfluorocarbon skeleton can be used as the cation exchange resin without any limitation.

[0036]
Anion exchangeresin obtained byintroducing an anionexchange group (an exchange group using an anion as a counter ion) such as a primary amino group, a secondary amino group, a tertiary amino group, a quaternary ammonium group, a pyridyl group, an imidazole group, a quaternary pyridinium group, or a quaternary imidazolium group into a polymer having a three-dimensional network structure similar to that in the case of the cation exchange resin can be used as the anion exchange resin without any limitation.

[0037]
The non-working side electrode assembly 14 is constituted by laminating a non-working side electrode 46, a second electrolyte solution holding portion 48, a third ion exchange membrane 50, a third electrolyte solution holding portion 52, and a fourth ion exchange membrane 54 in this order arranged on one surface side of a non-working base sheet 15, and is formed into a disk shape as in the case of the working side electrode assembly 12.
[0038]

The non-working side electrode 46 has the same constitution as that of the working side electrode 36 in the working electrode assembly 12, and the constitutions and components of the second electrolyte solution holding portion 48 and the third electrolyte solution holding portion 52 are the same as those of the electrolyte solution holding portion 38.

[0039]
Furthermore, the third ion exchange membrane 50 is formed of an ion exchange paint applied to the second electrolyte solution holding portion 48. The ion exchange paint is the same as the first ion exchange paint of which the first ion exchange membrane 44 is formed, and the third ion exchange membrane 50 functions as an ion exchange membrane similar to the first ion exchange membrane 44.
[0040]

The fourth ion exchange membrane 54 is formed of the same second ion exchange paint as that described above applied to the third electrolyte solution holding portion 52. The fourth ion exchange membrane 54 functions as an ion exchange membrane similar to the second ion exchange membrane 40.

[0041]
A working side electrode terminal plate 32A is arranged on the other surface of the base sheet 13, and conduction is established between the working side electrode terminal plate 32A and the working side electrode 36 of the working side electrode assembly 12 through a through-hole formed on the base sheet 13, and the working side electrode terminal plate 32A is connected to the working side electrode terminal 32 through the through-hole.

[0042]
Similarly, a non-working side electrode terminal plate 34A
is arranged on the other surface of the non-working side base sheet 15, and conduction is established between the non-working side electrode terminal plate 34A and the non-working side electrode 46 of the non-working side electrode assembly 14 through a through-hole formed on the non-working side base sheet 15, and the non-working side electrode terminal plate 34A is connected to the non-working side electrode terminal 34 through the through-hole.
[0043]

The first ion exchange membrane 44 and the fourth ion exchange membrane 54 at the tips of the working side electrode assembly 12 and the non-working side electrode assembly 14 are exposed so as to be capable of contactingwith the side of an organism, respectively.
[0044]

The DC electric power source 18 is composed of, for example, an AC/DC converter, and the electric power source circuit 28 between the DC electric power source 18 and the electric power source side working electrode terminal 33 and between the DC electric power source 18 and the electric power source side non-working electrode terminal 35 is provided with a controller 56 for adjusting, out of a current value during energization and an energization time as administration time, at least the current value. As a result, each of the current value and the administration time can be adjusted in a certain range.

[0045]
A predetermined amount of spacing S is provided between the first ion exchange membrane 44 and the fourth ion exchange membrane 54 at each of the tips of the working side electrode assembly 12 and the non-working side electrode assembly 14 in order to prevent a current from directly flowing between the membranes upon energization. The spacing S has substantially the same size as that of the diameter of each of the first ion exchange membrane 44 and the fourth ion exchange membrane 54.

[0046]
In the embodiment, the working side electrode assembly 12 and the non-working side electrode assembly 14 are attached such that central axes thereof are in parallel with each other. However, the present invention is not limited thereto. For example, as shown in Fig. 4, the working side electrode assembly 12 and the non-working side electrode assembly 14 may be placed such that central axes thereof intersect each other in a tip direction with an angle of 60 between the axes. Alternatively, as shown in Fig. 5, the working side electrode assembly 12 and the non-working side electrode assembly 14 may be placed such that central axes thereof spread out to a tip direction.

[0047]
In such embodiment, the working side electrode assembly 12 and the non-working side electrode assembly 14 are placed at the tip of the bar-like holding portion 20 with the spacing S between them. Therefore, when a drug solution is permeated into an affected area upon therapy or treatment outside a body (such as melanoma or skin cancer) or in a mouth (such as local anesthesia in odontotherapy, the therapy of stomatitis, or local anesthesia in an oral cavity), a doctor grips the gripping portion 21 to bring the first ion exchange membrane 44 at the tip of the working side electrode assembly 12 at the tip of the gripping portion 21 into close contact with the affected area and, at the same time, to bring the fourth ion exchange membrane 54 at the tip of the non-working side electrode assembly 14 into close contact with a mucous membrane or the like near the affected area for energization. As a result, a target drug solution can be easily permeated into a target site in a pinpoint manner. When the affected area is placed in an oral cavity (that is, in the dark), the affected area in the dark can be illuminated by turning the switch 23 on to irradiate the area with light emitted from the tip of the optical fiber 24 for irradiation of the irradiation optical system 26.

[0048]
In addition, the working side electrode assembly 12 and the non-working side electrode assembly 14 can be detached together with the rod-like member 16 from the holding portion 20, so a drug solution can be easily exchanged.
[0049]

The rod-type iontophoresis device 10 can be used for, for example, therapy based on photodynamic therapy (PDT) as an anticancer remedy involving: applying a photosensitized reactive material to a cancer cell; and irradiating the material with light to cause the material to absorb the light.

[0050]
In this case, the following constitution is adopted. That is, the drug solution holding portion 42 in the working side electrode assembly 12 holds the photosensitized reactive material, and an affected area can be irradiated with light having a wavelength to be absorbed by the photosensitized reactive material and emitted from the irradiation light source 22 through the optical fiber 24 for irradiation. In the case of PDT, the working side electrode assembly 12 is shifted from the affected area after the photosensitized reactive material has been permeated into the affected area by iontophoresis. Then, light to be absorbed by the photosensitized reactive material is applied with the tip of the optical fiber 24 for irradiation as the position of the affected area.

[0051]
When the affected area has a complicated shape (a two-dimensional convexoconcavefigure), a picture is drawn by means of a lightproof insulating paint so that the shape remains on the surface of the first ion exchange membrane 44. Iontophoresis is performed in this state with the iontophoresis device pressed against a skin, whereby the photosensitized reactive material enters only the affected area and, at the same time, the lightproof insulating paint adheres to the periphery of the affected area. That is, the photosensitized reactive material does not enter a normal site and is not irradiated with light. In other words, double protection can be achieved.

[Example 1]
[0052]

Next, a rod-type iontophoresis device 60 according to Example 2 shown in Figs. 6 and 7 will be described.

[0053]
In the rod-type iontophoresis device 60, the tip of the holding portion 20 is provided with a ring-like light guide 62 to be connected to the optical fiber 24 for irradiation, and the working side electrode assembly 12 and the non-working side electrode assembly 14 are adapted to be capable of sliding back and forth to a cancer together with the rod-like member 16.

[0054]
The slide structure is identical to a knock structure in a ball-point pen for changing the position of the tip of the pen in two-stages: a projected position and a retracted position.

Therefore, detailed description of the slide structure is omitted.
[0055]

The ring-like light guide 62 is constituted in such a manner that light to be emitted from the tip of the optical fiber 24 for irradiation connected to the light guide is introduced in a ring fashion and outputted f rom the inner peripheral surf ace of the guide.
[0056]

The tip of the light guide 62 at the projected position is adapted to coincide substantially with the tips of the working side electrode assembly 12 and the non-working side electrode assembly 14.

[0057]
Accordingly, the rod-like member 16 or the like is placed at the projected position upon administration of a drug solution, and the member or the like is placed at the retracted position after the administration of the drug solution. As a result, an affected area to which the drug solution has been administered is separated from the working side electrode assembly 12, and the gap between the area and the assembly is irradiated with light from the inner peripheral surface of the light guide 62.

[0058]
In this example, the holding portion 20 is provided with the optical fiber 24 for irradiation. However, the irradiation optical system 26 including the optical fiber 24 for irradiation is not needed when the device is not used for PDT or when there is no need to illuminate an affected area.

Effect of the Invention [0059]

In the present invention, the working side electrode assembly and the non-working side electrode assembly in the iontophoresis device are placed at the tip of the rod-like member, and the rod-like member is detachably supported by the tip of the bar-like holding portion. For example, an anticancer agent is permeated by iontophoresis into a pinpoint such as the site of melanoma, whereby efficient therapy can be performed with little side effect. In addition, the drug solution can be exchanged by detaching the working side electrode assembly and the non-working side electrode assembly together with the rod-like member from the support member.

Claims (9)

  1. [Claim 1] A rod-type iontophoresis device comprising:

    a working side electrode assembly and a non-working side electrode assembly each used for administering an ionic drug by iontophoresis; and a DC electric power source connected to the working side electrode assembly and the non-working side electrode assembly with opposite polarities, characterized by comprising:

    a rod-like member for supporting the working side electrode assembly and the non-working side electrode assembly; and a bar-like holding portion for detachably supporting the rod-like member, the working side electrode assembly and the non-working side electrode assembly being disposed at a tip of the rod-like member, and a predetermined amount of spacing being provided between the working side electrode assembly and the non-working side electrode assembly.
  2. [Claim 2] The rod-type iontophoresis device according to claim 1, characterized in that the ionic drug comprises a photosensitized reactive material to be activated by absorbing light, and the holding portion comprises an irradiation optical system for applying light from a vicinity of a tip of the working side electrode assembly.
  3. [Claim 3] The rod-type iontophoresis device according to claim 2, characterized in that the holding portion comprises:

    a light source comprising a light-emitting diode or a laser diode for emitting light having a wavelength sensed by the photosensitized reactive material; and an optical fiber for irradiation for introducing light emitted from the light source to the rod-like member or a neighborhood thereof.
  4. [Claim 4] The rod-type iontophoresis device according to any one of claims 1 to 3, characterized in that:

    the holding portion comprises an electric power source side working electrode terminal and an electric power source side non-working electrode terminal connected to the DC electric power source with opposite polarities through wiring from the DC electric power source, the wiring being housed in the holding portion;

    the rod-like member comprises on aproximal end of a side thereof detachable from the holding portion a working side electrode terminal and a non-working side electrode terminal which are connected to or are separated from the electric power source side working electrode terminal and the electric power source side non-working electrode terminal when attached to or detached from the holding portion, and the working side electrode teminal and the non-working side electrode terminal are connected to a working side electrode and a non-working side electrode in the working side electrode assembly and the non-working side electrode assembly, respectively.
  5. [Claim 5] The rod-type iontophoresis device according to claim 4, characterized in that a controller is provided in the holding portion, the controller being disposed in an electric power source circuit between the electric power source side working electrode terminal and the electric power source side non-working electrode terminal and the DC electric power source for adjusting, out of a current value during energization and an energization time as administration time, at least the current value.
  6. [Claim 6] The rod-type iontophoresis device according to any one of claims 1 to 5, characterized in that the working side electrode assembly and the non-working side electrode assembly are disposed such that central axes thereof are in parallel with each other.
  7. [Claim 7] The rod-type iontophoresis device according to any one of claims 1 to 5, characterized in that the working side electrode assembly and the non-working side electrode assembly are disposed such that central axes thereof spread out to a tip direction.
  8. [Claim 8] The rod-type iontophoresis device according to any one of claims 1 to 5, characterized in that the working side electrode assembly and the non-working side electrode assembly are disposed such that central axes thereof intersect each other in a tip direction.
  9. [Claim 9] The patch-type iontophoresis device according to any one of claims 1 to 8, characterized in that:

    the working side electrode assembly comprises:

    the working side electrode connected to the DC electric power source having the same polarity as that of a charged ion of the ionic drug;

    an electrolyte solution holding portion holding an electrolyte solution, the electrolyte solution holding portion being placed on a front surface of the working electrode;

    a second ion exchange membrane selecting an ion having a polarity opposite to that of the charged ion of the ionic drug, the second ion exchange membrane being placed on a front surface of the electrolyte solution holding portion;

    a drug solution holding portion holding the ionic drug, the drug solution holding portion being placed on a front surface of the second ion exchange membrane; and a first ion exchange membrane selecting an ion having the same polarity as that of the charged ion of the ionic drug, the first ion exchange membrane being placed on a front surface of the drug solution holding portion; and the non-working side electrode assembly comprises:

    the non-working side electrode connected to the DC
    electric power source having a polarity opposite to that of the charged ion of the ionic drug;

    a second electrolyte solution holding portion holding a second electrolyte solution, the second electrolyte solution holding portion being placed on a front surface of the non-working electrode;

    a third ion exchange membrane selecting an ion having the same polarity as that of the charged ion of the ionic drug, the third ion exchange membrane being placed on a front surface of the second electrolyte solution holding portion;

    a third electrolyte solution holding portion holding a third electrolyte solution, the third electrolyte solution holding portion being placed on a front surface of the third ion exchange membrane; and a fourth ion exchange membrane which is the ion exchange membrane selecting an ion having a polarity opposite to that of the charged ion of the ionic drug, the fourth ion exchange membrane being placed on a front surface of the third electrolyte solution holding portion.
CA002619665A 2005-09-15 2006-09-14 Rod type iontophoresis device Abandoned CA2619665A1 (en)

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JP2005-268318 2005-09-15
JP2005268318 2005-09-15
PCT/JP2006/318295 WO2007032446A1 (en) 2005-09-15 2006-09-14 Rod type iontophoresis device

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EP (1) EP1925336A4 (en)
JP (1) JPWO2007032446A1 (en)
KR (1) KR20080047600A (en)
CN (1) CN101252968A (en)
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CA (1) CA2619665A1 (en)
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US7890164B2 (en) 2011-02-15

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