WO2019185803A1 - Verfahren zum stimulieren einer gewebestruktur mittels einer elektrischen feldstärke, system zum stimulieren einer gewebestruktur und magnetstruktur zum implantieren an eine gewebestruktur - Google Patents
Verfahren zum stimulieren einer gewebestruktur mittels einer elektrischen feldstärke, system zum stimulieren einer gewebestruktur und magnetstruktur zum implantieren an eine gewebestruktur Download PDFInfo
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- WO2019185803A1 WO2019185803A1 PCT/EP2019/057870 EP2019057870W WO2019185803A1 WO 2019185803 A1 WO2019185803 A1 WO 2019185803A1 EP 2019057870 W EP2019057870 W EP 2019057870W WO 2019185803 A1 WO2019185803 A1 WO 2019185803A1
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- magnetic
- magnetic structure
- tissue structure
- tissue
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N2/00—Magnetotherapy
- A61N2/02—Magnetotherapy using magnetic fields produced by coils, including single turn loops or electromagnets
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- 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
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N2/00—Magnetotherapy
- A61N2/06—Magnetotherapy using magnetic fields produced by permanent magnets
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/40—Applying electric fields by inductive or capacitive coupling ; Applying radio-frequency signals
Definitions
- the present disclosure shows concepts for stimulating tissue structures.
- Exemplary embodiments concern a method for stimulating a tissue structure by means of an electric field strength.
- Further exemplary embodiments relate to a system which is designed to stimulate a tissue structure by means of an electric field strength, and to a magnet structure for implantation on a tissue structure.
- Nerve cells can be artificially stimulated.
- Nerve cells, nerve cords or muscles can, for example, be stimulated by means of electronic devices of medical technology. Nerve cells can be part of the peripheral nervous system of the human body.
- Some peripheral nerve stimulation systems use implants, which may consist of complex electronics, an energy storage device and electrodes with connecting cables. Via the electrodes, an electric field can be applied to the tissue structure, which causes the stimulation of the desired nerves or muscles.
- the implanted energy storage is needed to power the implanted electronics and may have a significant impact on implant volume due to its size. Protection of the electronics and energy storage against moisture that may invade the implanted implant may be necessary.
- the respective elements are therefore hermetically sealed, for example, in rigid, mostly large and heavy titanium housings.
- further requirements for technical reliability for example, can be added to guarantee the tightness, which can vary depending on the requirements of the storage capacity. In such systems wear can easily occur, for example due to electrochemical processes in the human body.
- Ka belmoren between the electronics of the implant and the electrodes at the place of stimulation, such as on the tissue structure are attached, if the electronics can not be placed directly on the stimulation site due to size and weight.
- a disadvantage of implants with integrated electronics for example, a possible corrosion of stimulation electrodes, the charge input into the human body, for example by a DC load while charging the energy storage or currency end of the stimulation and high technical requirements for hermetically sealed Ge housing with necessary electrical feedthroughs.
- possible failures of the implant or of parts of the electronics of the implant by moisture action or mechanical effects can occur, which reduce a reliability Kings NEN.
- Implanting such implants can be expensive and expensive.
- high equipment costs, limited life of energy storage and ro bustheitsprobleme of feedthroughs, cables and electrodes can be detrimental, as well as high demands on electromagnetic compatibility (EMC) or causing interference.
- EMC electromagnetic compatibility
- the object of the invention is to provide an improved method for stimulating tissue structures.
- a method for stimulating a tissue structure by means of an electric field strength comprises generating an alternating electromagnetic field in an environment of the tissue structure and concentrating the electromagnetic alternating field in the tissue structure.
- the emergence of a direct current load can be avoided or reduced.
- Concentrating the electromagnetic See alternating field in the tissue structure by means of an implanted Magnetstruk tur within the environment.
- an alternating electromagnetic field may be generated so as to surround the tissue structure while also penetrating and within the tissue structure.
- the environment of the tissue structure may be within a body having the tissue structure.
- a device for generating the alternating electromagnetic field is positioned within the body.
- a device such as an electromagnetic coil or an inductive element
- the electro-magnetic field for example, be a time-dependent alternating field or it can be generated electromagnetic pulses.
- An electromagnetic coil may, for example, have a main radiation direction of the electromagnetic field, wherein in a Ausfittsform of the method, the main radiation direction can be directed in the direction of the tissue structure.
- An electromagnetic field may be generated in the tissue structure as well as within the environment of the tissue structure by means of a device that is not implanted or need not be implanted.
- a required electronics can for example be positioned completely outside the body and does not have to be implanted in the body.
- the electromagnetic field has an electrical field component that can be used to electrically stimulate or excite the tissue structure.
- the selected size of the device for example, a size of the electromagnetic coil
- small, portable electromagnetic coils may cause comparatively weak electromagnetic fields, the electrical field components of which are initially not readily suitable for stimulating the tissue structures in some tissue structures.
- transcranial stimulation to stimulate gavel areas large stationary magnetic coils can be used outside the body, placed near the skull and subjected to correspondingly high currents, to provide the required high electromagnetic field strength in the skull, the site of stimulation produce.
- the principle of stimulation is based (like that of the proposed stimulation) that the time-varying magnetic field is ver with an electric field connected, which needed for the stimulation or electrical stimulation electric field and the associated power required within the skull (or within the tissue structure).
- large electromagnetic coils may be necessary.
- a large electromagnetic coil must be subjected to a high current. Due to the size of the required coils and the high energy needed for the high currents, it is hardly possible to provide small and / or portable devices to stimulate the tissue structure.
- the method according to the invention provides for concentrating the electromagnetic alternating field in the tissue structure. Concentration may take place, for example, in part of the tissue structure (e.g., a portion of a nerve cord) to stimulate that portion.
- the environment of the tissue structure may include an area less than 5 cm (or less than 3 cm) away from the part of the tissue structure to be stimulated.
- the magnetic structure lies within the environment of the tissue structure.
- the concentration of the electromagnetic alternating field is effected by means of an implanted th magnetic structure which is positioned within the environment.
- the magnetic structure may have a high magnetic permeability or magnetic conductivity and thus bundle the field lines of the generated electromagnetic field, so that the field strength in the vicinity of the magnetic structure is higher than in the case in which no magnetic structure would be present.
- the magnetic structure may comprise a metal or a ferromagnetic material (for example, an alloy).
- an electromagnetic field can be generated with a first, lower field strength in the vicinity of the tissue structure and by the magnetic structure, the field strength of the electromagnetic field can be locally concentrated and thereby increased.
- the magnetic structure can be positioned directly next to the tissue structure (for example at a minimum distance of less than 0.5 cm) so that the local field strength increase of the electromagnetic field occurs within the tissue structure. Due to the local concentration of the electromagnetic field, the field strength of the electromagnetic field can be so greatly increased by the magnetic structure within the tissue structure that it can be used to stimulate the tissue structure.
- An advantage of concentrating the electromagnetic field is that not the entire body with the tissue structure has to be exposed to a high electromagnetic field strength in order to stimulate the tissue structure.
- electric currents produced by the electric field flow locally in the part of the tissue structure which is to be stimulated.
- the high electric field strength required for the stimulation can thus be generated selectively.
- Another advantage of concentrating the electromagnetic field is that in generating the electromagnetic field, large, stationary coils that would need to be boosted with large required current strengths can be avoided, thereby resulting in the possi bility of a portable electronics.
- the method makes it possible to reduce the implantation effort for stimulating a tissue structure.
- it may be easier to implant the magnetic structure than implant an implant with electronics, energy storage devices and electrodes, in particular since the magnetic structure can be made comparatively small.
- the utilized magnetic structure may also be particularly durable and robust due to its low complexity (e.g., including homogeneous solids, e.g., comprising only one material).
- a magnetic structure which comprises a ferromagnetic and / or ferrimagnetic material in order to increase an electromagnetic field strength at the excitable tissue structure.
- the ferromagnetic and / or ferrimagnetic material may have non-linear properties (hysteresis, saturation, etc.).
- the magnetic structure may comprise a ferrite material, such as a soft magnetic ferrite material, such as iron, cobalt, manganese, zinc and / or nickel.
- the Magnetic structure may include an alloy comprising at least one of iron, cobalt, manganese, zinc and / or nickel.
- a permeability number m G of the ferrite material or amorphous metal may be greater than 80 (or greater than 200, greater than 500, greater than 1000, greater than 10,000, or greater than 100,000) and / or less than 200,000 (or less than 100,000 or less than 10,000).
- ferrite materials may include a ferrite powder and / or amorphous metals.
- a development of the method provides for using a magnetic structure which has a cylindrical shape whose axis points to the tissue structure.
- the magnet structure may further have a conical shape.
- the magnetic structure towards the tissue structure decrease towards (rejuvenate) or increase.
- the shape of the magnetic structure makes it possible to achieve high spatial focusing of the stimulation on a selected tissue structure.
- a decreasing to the tissue structure magnetic structure cause a stronger concentration of the electro-magnetic field in the tissue structure.
- the magnetic structure may be positioned to cause an increase in electromagnetic field strength within the tissue structure.
- the axis of the magnetic structure may be arranged parallel to a main radiation direction of a device that generates the electromagnetic field.
- two or more magnetic structures may be provided in the vicinity of the tissue structure.
- the two magnet structures may be positioned approximately on opposite sides of the tissue structure. As a result, it may be possible to particularly focus and / or concentrate the electrical field in the tissue structure between the two magnetic structures.
- a magnetic structure may be used for the process that includes a biocompatible cladding layer.
- the biocompatible shell layer comprises at least one material of hermetically dense or non-hermetic.
- Hermetically sealed may have a higher density than a non-hermetically sealed material.
- a hermetically sealed material may be gas-tight and watertight, for example, a conclusion preventing exchange of air or water.
- a non-hermetically sealed material can be about waterproof.
- Materials of hermetic nature may be, for example, titanium or ceramic.
- Materials of non-hermetic nature may be, for example, silicone or parylene.
- a thickness of the biocompatible shell layer may be greater than 0.1 mm (or greater than 0.5 mm, greater than 1 mm or greater than 2 mm) and / or less than 3 mm (or less than 2 mm or less than 1 mm).
- the biocompatible shell layer can provide high compatibility of the magnetic structure to the body in which it is or will be implanted.
- materials of the magnetic structure could be unfavorable to the body, but by using the biocompatible shell layer, the magnet structure can still be implanted without incompatibility problems.
- a magnetic structure is used whose maximum length less than 5 cm (or less than 4 cm, less than 3 cm, less than 2 cm or less than learning) and / or greater than 0.3 mm (or greater than 0.5 cm, greater than 1 cm or greater than 2 cm). Additionally or alternatively, a magnetic structure is used whose maximum width is less than 10 mm (or less than 5 mm or less than 3 mm) and / or greater than 1 mm (or greater than 2 mm or greater than 5 mm).
- the length may be a length and the width of a diameter of a cylindrical magnet structure.
- the size of the magnetic structure can be selected, for example, as a function of the size of the tissue structure to be stimulated. For example, in an environment of a first tissue structure, it may be advantageous to use a longer and narrower magnetic structure, whereas in an environment of a second tissue structure it may be advantageous to use a shorter, wider magnetic structure.
- concentrating the electromagnetic alternating field causes an increase in the field strength of the alternating electromagnetic field within the tissue structure of at least one lactor 5 (or at least one lactor 10, at least one lactor 20 or at least one lactator 50) as compared to a leak in which the magnetic structure is not used or present.
- This may make it possible to provide an electromagnetic field with a correspondingly lower field strength generate in order to still be able to effect stimulation by means of the concentrated electromagnetic field.
- power requirements can be reduced to a device for generating the electromagnetic field.
- a magnetic field strength concentrated within the tissue structure has a value of at least 100 mT (or at least 500 mT, at least 1000 mT or at least 3000 mT) and / or at most 10,000 mT (or at most 5000 mT or at most 3000 mT).
- the area of the tissue structure in which the electromagnetic field is concentrated may have an area of less than 3 mm 2 square (or less than 2 mm 2 or less than 1 mm 2 ) and / or an area greater than 2.5 mm 2 (or more than 1.5 mm 2 or more than 2.5 mm 2 ).
- a minimum field strength within the range can be at least 50% of a maximum field strength within the range.
- the concentrated magnetic field strength can be provided within a distance of at least 0.1 mm (or at least 0.5 mm or at least 1 cm) and / or at most 2 cm (or at most 1 cm).
- the magnetic structure is removed less than 2 cm (or less than 1 cm, less than 0.5 cm or less than 0.1 cm) from the excitable tissue structure and provided within a body comprising the tissue structure.
- the distance may represent a maximum distance between an edge of the tissue structure and an edge of the magnetic structure.
- the providing may include, for example, implanting a magnet structure prefabricated outside the body comprising the tissue structure.
- implanting a magnet structure prefabricated outside the body comprising the tissue structure.
- the prefabricated magnetic structure can be secured within the body by means of a biocompatible adhesive in a position in which concentration of the magnetic field in the tissue structure is possible.
- the advantage of this may be that the magnetic structure outside of the body is easy to manufacture and, for example, a donated certain shape can be made precisely.
- the provision of the magnetic structure according to an embodiment of the method comprises injecting ferrite particles and / or ferromagnetic particles into the body. The ferrite particles can be injected to a position next to the tissue structure.
- the ferrite particles are dissolved or suspended when injected into an adhesive (especially with respect to ferrites, ceramics, etc.).
- the adhesive may be selected to solidify after a predetermined time after injection, thereby keeping the shape and contour of the magnetic structure stable.
- the ferrite particles dissolved in the adhesive can be injected by means of a syringe and precisely positioned so that an implantation of a prefabricated magnetic structure can be dispensed with.
- the ferrite particles may be dissolved in a ferrite emulsion or ferrite suspension for injection.
- a proportion of the ferrite particles in a total mass of the solution with the adhesive is higher than 50% (or higher than 70% or higher than 90%) and / or lower than 95% (or lower than 80%).
- fibrin glue may be used as an adhesive or other bio-compatible adhesives may be used.
- the injected ferrite particles are shaped during curing of the adhesive of the injected solution by means of a magnetic field.
- the magnetic field can be a static or quasi-static magnetic field.
- the magnetic field may be generated by means of a coil surrounding the body with the tissue structure and the injected ferrite particles.
- the ferrite particles still dissolved in the adhesive solution react to the generated magnetic field and change their position depending on the magnetic field.
- By adjusting the magnetic field for example, regulating the magnetic field strength and / or the orientation of the magnetic field, it is possible to form the ferrite particles in such a way that the magnetic structure is formed.
- the magnetic field can be applied until the adhesive has hardened and the ferrite particles retain the shape caused by the magnetic field even without the applied magnetic field.
- the magnetic structure can thus be shaped by means of a magnetic field from the solution of the ferrite particles within the body, without animals to implant a prefabricated magnetic structure in the body.
- the proposed method can be used to stimulate peripheral nerve structures.
- the tissue structure may be part of a peri-nerve structure.
- the tissue structure is a nerve in an arm or leg of, for example, a human body.
- the tissue structure is located in a trunk of a human body.
- muscle structures can be stimulated or stimulated.
- the method can be used to stimulate the tissue structure for non-therapeutic purposes, such as muscle stimulation, eg, comparable to electromyostimulation (EMS).
- EMS electromyostimulation
- the method for stimulating the tissue structure can be used in sports, for example, to increase muscular performance and to support a systematic training process.
- muscle power can be used to improve or train a high-speed force of the stimulated muscle that is recruited during voluntary exercise only at maximum loads or speeds of movement.
- One aspect of the present invention relates to a method of providing a magnetic structure to a tissue structure.
- the method comprises injecting a mixture comprising at least ferrite particles and bioadhesive into a body comprising the tissue structure.
- the method further comprises shaping the mixture comprising the ferrite particles and adhesive by means of a magnetic field during curing of the adhesive.
- the magnetic structure provided according to the method can be used, for example, for concentrating an electromagnetic field within the tissue structure.
- the ferrite particles and the bioadhesive may be injected into a region that is less than the length of the tissue structure.
- a cylindrical and / or conical magnetic structure can be formed from the injected ferrite particles and the bioadhesive.
- the system comprises a portable coil device for generating an alternating electromagnetic field and a magnetic structure implantable on the tissue structure.
- the magnetic structure may be implanted in a body to concentrate an alternating electro-magnetic field generated by the coil device in the tissue structure.
- the Coil device can be positioned outside the body with the tissue structure to stimulate the tissue structure by means of the electromagnetic field.
- the system is designed such that upon stimulation of the tissue structure, electronics needed to generate the electromagnetic field in the portable coil device are positioned outside a body (e.g., completely or wholly outside the body) with the tissue structure.
- a body e.g., completely or wholly outside the body
- implanting electronics, electrodes or electrical cables or leads into the body to operate the system as intended and to stimulate the tissue structure.
- the possibility that the system can be operated as intended, if only (eg exclusively) the magnetic structure is implanted in the body, can (eg in relation to systems in which an implantation of electrical connections, electrodes or cables provided in the body is) a less strong intervention in the body can be achieved (eg reduced invasiveness).
- the system is formed without direct contact of electronics or an electrical conductor with the implantable magnetic structure.
- it can be dispensed with, for example, to wind an electrical line around the magnetic structure or to position it on the magnetic structure.
- the magnetic structure may be passive only, e.g. essentially comprise ferrite material, adhesive and possibly further bonding materials.
- the coil device comprises all the electronics of the system needed to generate the electromagnetic field.
- electrical connections to the coil are arranged exclusively within the housing of the coil device.
- the system may allow tissue stimulation with minimal invasion of the body with the tissue structure.
- only the small magnetic structure needs to be implanted into the body without the need to implant a connection (eg, electrical cables) into the body.
- the system's magnetic structure has a maximum length of less than 3 cm and / or a maximum width of less than 1 cm.
- the magnetic structure has a cylindrical and / or conical shape.
- the magnet structure is formed as a rigid solid body with a solid shape.
- the magnetic structure may be formed, for example, rod-shaped or lumpy.
- the magnetic structure may comprise a ferromagnetic table, a ferrite material or a ferrimagnetic material.
- concentrating the electromagnetic alternating field causes an increase in field strength of the alternating electromagnetic field of at least a factor of 10 in an environment of the magnetic structure (eg, at a distance of at most 1 cm from the magnetic structure, e.g., in the direction an axis of the magnetic structure).
- a magnetic field strength concentrated within an environment of the magnetic structure has a value of at least 500 mT.
- the field strength may be at least 500 mT when the magnetic structure is positioned within a body on a tissue structure.
- the magnetic structure of the system is designed to be less than that of a tissue structure to be excised and disposed within a body comprising the tissue structure.
- the portable coil device has a volume less than 3000 cm 3 (or less than 2000 cm 3 , less than 1000 cm 3 , or less than 500 cm 3 ) and / or a weight less than 5 kg (or less than 3 kg low than 1 kg or less than 0.5 kg).
- the coil device may have an electrical inductance, control electronics for Beauf beat the electrical inductances with a current and an energy storage.
- the electrical inductance may be a coil with a diameter of less than 10 cm (or less than 7 cm, less than 5 cm or less than 3 cm).
- the portable coil device may be configured to be attached to a body part having the tissue structure.
- the portable Spulenvor device have a fastening strap. Due to the portability of the coil device, it is possible, for example, the tissue structure continuously or at any times without a user of the coil device would have to go to a stationary coil device to stimulate the tissue structure.
- the magnetic structure comprises at least one ferrite material and has a maximum length of less than 2 cm and / or a maximum width of less than 5 mm.
- the magnetic structure may have a cylindrical and / or conical shape.
- the magnet structure may, for example, be round and have a diameter of less than 5 mm (or less than 3 mm or less than 1 mm).
- the magnetic structure may be bean-shaped or lenticular.
- the magnetic structure has at least a proportion of an adhesive of more than 20%.
- the adhesive of the magnet structure may serve, for example, to hold ferrite particles comprising the magnetic structure in a predetermined shape of the magnetic structure.
- the magnetic structure has a conical shape.
- the magnetic structure may be formed as a rigid solid body.
- the magnetic structure can be formed without holes or feedthroughs.
- the solid is e.g. free from imple ments and / or formed free of cavities and / or formed without moving components.
- the magnetic structure may comprise a homogeneous solid having a solid shape (e.g., no moving parts).
- the magnetic structure comprises a biocompatible shell layer, wherein the bio-compatible shell layer comprises at least one material of hermetically dense or non-hermetic density.
- the magnetic structure has an adhesive content of at least 20% and / or a proportion of ferrite material of at least 50%.
- the magnetic structure for implantation to a tissue structure, eg adjacent to the tissue structure.
- the magnetic structure comprises at least one ferrite material, wherein the magnetic structure has a maximum length of less than 3 cm and / or a maximum width of less than 1 cm, wherein the Magnetstruk structure is bean-shaped or lenticular.
- Another aspect relates to a suspension for injecting into a body to fabricate a magnetic structure within the body.
- the suspension comprises an adhesive and ferrite particles dissolved in the adhesive.
- the suspension is a solution comprising adhesive, ferrite particles and solvent.
- the adhesive can be a bioadhesive.
- the suspension is e.g. designed for injection by means of a syringe.
- the suspension may be liquid enough to be introduced by means of a syringe, for example, in a body.
- the suspension may e.g. harden in the body, so that a solid, rigid magnetic structure can be formed.
- simple geometries e.g. Solid bodies without passages or cavities are formed.
- the proportion of ferrite particles in the suspension is e.g. at least 50% (or at least 70%).
- the proportion of the adhesive may be more than 20% (or more than 30%).
- One aspect relates to a method for generating a stimulation signal for at least partially avoiding a DC load and to reduce a Störstrah ment (EMC) with minimal implant electronics.
- EMC Störstrah ment
- FIG. 1 shows an example of a method for stimulating a tissue structure
- FIG. 2 shows an example of a system for stimulating a tissue structure
- FIG. 3 shows an exemplary magnetic structure for implantation on a tissue structure
- FIG. 4 shows an example of a stimulation of a peripheral nerve cord
- FIG. 6 shows an example of a second stimulation signal.
- FIG. 1 shows a flow chart of an exemplary method 100 for stimulating a tissue structure.
- the method 100 includes generating 110 an electromagnetic alternating field in an environment of the tissue structure.
- the method 100 further comprises concentrating 120 the alternating electromagnetic field in the tissue structure by means of an implanted magnetic structure.
- the method 100 is suitable, for example, for stimulating a tissue structure within a body, wherein an electronic device outside the body can be used to stimulate.
- a portable coil device may be used to generate an electromagnetic field outside the body, which is directed toward the body (for example, by suitable positioning of the portable coil device) such that an alternating electromagnetic field is generated in the vicinity of the tissue structure . Since the alternating electromagnetic field that may be caused by a portable coil device may have too low an electric field strength to directly stimulate the tissue structure, according to the method 100, the implanted magnetic structure is used to concentrate 120 the electromagnetic field.
- the magnetic structure may be implanted in the vicinity of the tissue structure so as to concentrate the electromagnetic field generated by the external coil device within the tissue structure. In other words, the magnetic structure can be described as a magnetic concentrator. By concentrating 120 the electromagnetic field, the field strength of the electric field component within the tissue structure can be increased to a value at which the tissue structure can be electrically stimulated.
- the implanted magnetic structure makes it possible to use portable coil devices with small size coils to stimulate the tissue structure.
- the coils of the portable coil device require a power supply that can be provided, for example, by a battery or an energy store of the portable coil device.
- the magnetic field concentrator is used in the form of the implanted magnetic structure.
- the magnetic field concentrator allows the energy required for stimulation to be concentrated locally, so that the total energy required can be reduced by the efficient use and thus provided by a portable device (such as battery-powered) can.
- the method 100 makes it possible to implant or introduce only the magnetic structure into the body for stimulating the tissue structure, whereas all the electronic devices needed to stimulate (for example, to generate the electromagnetic field or the electric field) are outside the body pers can be operated with the fabric structure. An implantation effort can be reduced as a result.
- FIG. 2 shows an exemplary system 200 for stimulating a tissue structure (not shown).
- the system 200 includes a portable coil device 210 for generating a alternating electromagnetic field 220.
- the system 200 further includes a magnetic structure 230 implantable on the tissue structure.
- the implantable magnetic structure may, for example, be implanted in a body having the tissue structure.
- Fig. 3 shows an exemplary magnetic structure 300 for implantation to a tissue structure.
- the magnetic structure 300 has a conical shape.
- a first diameter 310 on a first side 320 of the magnetic structure 300 is greater than a second diameter 330 on a second side 340 of the magnetic structure 300.
- the first diameter 310 is more than 20% (or more than 40%, more than 60 %, more than 100% or more than 200%) and / or less than 300% (or less than 200% or less than 100% or less than 50%) greater than the second diameter 330.
- all edges are of conical shape rounded.
- FIG. 4 shows an example 400 of stimulation of peripheral nerves.
- an upper arm 410 is shown with a nerve cord 420 shown in detail.
- a magnetic structure 430 is provided.
- the magnetic structure for 130 is provided, for example, by implantation or injection of ferrite particles.
- a portable coil device 440 (only schematically and not completely shown) generates an electromagnetic alternating field 450, which is directed to the magnet structure 430.
- the portable coil device 440 includes approximately a housing having a height of at most 5 cm (i.e., the portable coil device is not more than 5 cm from the upper arm), so that it can be worn under a garment, for example.
- the alternating electromagnetic field 450 is provided by the orientation of the coil of the coil device 440 such that it is present in the vicinity of the nerve string 420 and the magnetic structure 430.
- the magnetic structure 430 concentrates the alternating electromagnetic field 450 into a concentrated electromagnetic field 460 within the nerve cord 420.
- the magnetic mesh 430 bundles the field lines of the alternating electromagnetic field 450 to increase the field strength of the electric field for stimulating the nerve cord 420 in the nerve strand 420.
- FIG. 5 shows an example 500 of a first stimulation signal 510.
- a current 520 of the first stimulation signal 510 is plotted over a time axis 530.
- the stimulation Signal 510 may be generated in accordance with a method of generating a pacing signal to avoid DC load and reduce spurious radiation (EMC) with minimal implant electronics.
- EMC spurious radiation
- An idealized stimulation pulse 540 (rectangular pulse in FIG. 5 comprising the hatched areas A1 and A2 shown) may, in order to avoid a direct current load (charge input), have equally large areas A1, A2. In the case of conventional implantation, this can be ensured by an electronic system which can generate a profile of the stimulation pulse according to FIG. 5.
- the pulse shape shown can be generated directly by a magnetic field or also by means of a coil (for example with non-linear inductance), both by the action of the law of induction according to the disclosed invention. If a coil is used in the implant, conventional electrodes can be used.
- the advantage is the provision of a transitional / intermediate solution between conventional concepts for stimulation and concepts according to the invention for stimulation for the complete electron- and electron-free (with respect to the implant) solution according to the invention.
- FIG. 6 shows an example 600 of a second stimulation signal 610.
- the signal form of the stimulation signal 610 can be effected by superposition of two signals 620, 630 with different frequencies. For the lower frequency (kHz range) can advantageously result in a so-called "aperiodic limiting case" of an excited oscillation. The superimposition of these two frequencies then gives a signal waveform of the second stimulation signal 610 corresponding to the dashed line in Fig. 6. This is a way to afford the required for stimulation current slew rate Ai / At as in Fig. 5 to be guaranteed.
- the superimposition can be accomplished on the one hand by an electronics outside the body (such as in a coil device according to the invention) or by utilization of non-linear properties (hysteresis, saturation) of ferro (or ferri-) magnetic substances in the magnetic structure.
- the invention enables a wireless, targeted electrical stimulation, which rusts without Elekt, cable, electronics and energy storage.
- the invasiveness of the proposed concept can be reduced to a minimum by forming implant bodies (eg magnetic structure) in the human body.
- implant bodies eg magnetic structure
- portable devices portable in size, weight, power supply
- Numerous applications can thus at any time by stimulation of tissue structures For example, relief of symptoms of pain, migraine or high blood pressure.
- a localized stimulation of excitable tissue is made possible.
- the stimulation of the central nerves and muscles may be possible because the required different electric field strength for the two cases, for example, by the design of the coil device and / or the magnetic structure can be provided.
- the entire "intelligence" (eg electronic components, energy storage, control) of the stimulation system is provided in an externally funded module, which takes over the energy supply and control for stimulation, while the implant itself is constructed as minimally as possible.
- Execution examples are based on the application of electromagnetic Fields interact with implanted ferrite particles (eg no nanoparticles) or prefabricated ferrite bodies, which concentrate the externally recorded electromagnetic energy so that locally limited action potentials can be triggered or other mechanisms of action can be exploited.
- a first example relates to a method for stimulating a tissue structure by means of an electric field strength, comprising: generating an electromagnetic alternating field in one Environment of the tissue structure; and concentrating the alternating electromagnetic field in the tissue structure by means of an implanted magnetic structure within the environment.
- a second example relates to a method according to Example 1, wherein the magnetic structure comprises a ferromagnetic or ferrimagnetic material in order to increase an electromagnetic field strength at the excitable tissue structure, wherein the material may have non-linear properties.
- a third example relates to a method according to one of the preceding examples 1 or 2, wherein the magnetic structure has a cylindrical shape whose axis points to a tissue structure.
- a fourth example relates to a method according to any one of preceding examples 1 to 3, wherein the magnetic structure comprises a biocompatible shell layer, the biocompatible shell layer comprising at least one material of hermetically dense or non-hermetic density.
- a fifth example relates to a method according to any one of the preceding examples 1 to 4, wherein a maximum length of the magnetic structure is less than 3 cm and / or a maximum width of the magnetic structure is less than 1 cm.
- a sixth example relates to a method according to any one of preceding examples 1 to 5, wherein concentrating the alternating electromagnetic field causes an increase of a field strength of the alternating electromagnetic field of at least a factor of 10 in the tissue structure.
- a seventh example relates to a method according to one of the preceding examples 1 to 6, wherein a magnetic field strength concentrated within the tissue structure has a value of at least 500 mT.
- An eighth example relates to a method according to any one of preceding examples 1 to 7, further comprising:
- a ninth example relates to a method according to example 8, wherein the providing comprises implanting a magnet structure prefabricated outside the body comprising the tissue structure.
- a tenth example relates to a method according to Example 8, wherein the providing comprises injecting ferrite particles dissolved in an adhesive into the body.
- An eleventh example relates to a method according to Example 10, wherein the injected Ferrritparti angle are formed during curing of the injected solution by means of a magnetic field.
- a twelfth example relates to a method according to any of the preceding examples 1 to 11, wherein the tissue structure is a peripheral nerve structure.
- a thirteenth example relates to a method of providing a magnetic structure to a tissue structure, the method comprising: injecting a mixture comprising at least ferrite particles and bioadhesive into a body comprising the tissue structure; and shaping the mixture comprising the ferrite particles and adhesive by means of a magnetic field during curing of the adhesive.
- a fourteenth example relates to a system for stimulating a tissue structure by means of an electric field strength, comprising: a portable coil device for generating an electromagnetic alternating field; and a magnetic structure implantable on the tissue structure.
- a fifteenth example relates to a system according to Example 14, wherein the portable Spulenvor device has a volume smaller than 2000 cm 3 and / or has a weight less than 3 kg.
- a sixteenth example relates to a magnetic structure for implantation on a fabric structure, the magnetic structure comprising at least one ferrite material, wherein the magnet structure has a maximum length of less than 3 cm and / or a maximum width of less than 1 cm and wherein the magnetic structure is a cylindrical Form has.
- Another example relates to a method for generating a stimulation signal for stimulating a tissue structure, wherein due to a waveform of the Stimulationsigna les whose positive maximum value is greater than their negative maximum value and whose absolute value integral less than 5% of its maximum amount, a DC load and an interference be reduced.
- Examples may further be or relate to a computer program having program code for executing one or more of the above methods
- Computer program is running on a computer or processor. Steps, operations or processes of various methods described above may be performed by programmed computers or processors. Examples may also cover program storage devices, such as digital data storage media, that are machine, processor, or computer readable and encode machine executable, processor executable, or computer executable program instructions. The instructions perform or cause some or all of the steps of the methods described above.
- the program storage devices may include or may be, for example, digital storage, magnetic storage media such as magnetic disks and magnetic tapes, hard disk drives or optically readable digital data storage media.
- a function block referred to as "means for executing a particular function” may refer to a circuit configured to perform a particular function.
- a “means for something” may be implemented as a “means designed for or suitable for something", e.g. a component or a circuit designed for or suitable for the particular task.
- Functions of various elements shown in the figures may be in the form of dedicated hardware, eg "a signal provider” Signal processing unit "," a processor ",” a controller “etc. as well as hardware capable of executing software in conjunction with associated software be implemented.
- the functions may be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some or all of which may be shared.
- processor or “controller” is by no means limited to hardware capable of executing software only, but may be Digital Signal Processor (DSP) hardware, network processor, application specific integrated circuit (ASIC) Application Specific Integrated Circuit), field programmable gate array (FPGA), Read Only Memory for storing software, Random Access Memory (RAM), and non-volatile memory storage.
- DSP Digital Signal Processor
- ASIC application specific integrated circuit
- FPGA field programmable gate array
- RAM Random Access Memory
- non-volatile memory storage Other hardware, conventional and / or custom, may also be included.
- a block diagram may represent a rough circuit diagram that implements the principles of the disclosure.
- a flowchart, a flowchart, a state transition diagram, a pseudocode, and the like may represent various processes, operations, or steps, for example, generally illustrated in computer-readable medium and thus executed by a computer or processor, whether or not such computer or processor is explicitly shown.
- Methods disclosed in the specification or claims may be implemented by a device having means for performing each of the respective steps of these methods.
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- Radiology & Medical Imaging (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA3095228A CA3095228A1 (en) | 2018-03-28 | 2019-03-28 | Method for stimulating a tissue structure by means of an electric field strength, a system for stimulating a tissue structure and a magnetic structure for implantation on a tissue structure |
US17/041,091 US20210106823A1 (en) | 2018-03-28 | 2019-03-28 | A Method for Stimulating a Tssue Structure by Means of an Electric Field Strength, a System for Stimulating a Tissue Structure and a Magnetic Structure for Implantation on a Tissue Structure |
EP19714621.0A EP3773890A1 (de) | 2018-03-28 | 2019-03-28 | Verfahren zum stimulieren einer gewebestruktur mittels einer elektrischen feldstärke, system zum stimulieren einer gewebestruktur und magnetstruktur zum implantieren an eine gewebestruktur |
AU2019240829A AU2019240829A1 (en) | 2018-03-28 | 2019-03-28 | A method for stimulating a tissue structure by means of an electric field strength, a system for stimulating a tissue structure and a magnetic structure for implantation on a tissue structure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102018107425.5 | 2018-03-28 | ||
DE102018107425.5A DE102018107425B4 (de) | 2018-03-28 | 2018-03-28 | Verfahren zum Stimulieren einer Gewebestruktur mittels einer elektrischen Feldstärke, System zum Stimulieren einer Gewebestruktur und Magnetstruktur zum Implantieren an eine Gewebestruktur |
Publications (1)
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WO2019185803A1 true WO2019185803A1 (de) | 2019-10-03 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/EP2019/057870 WO2019185803A1 (de) | 2018-03-28 | 2019-03-28 | Verfahren zum stimulieren einer gewebestruktur mittels einer elektrischen feldstärke, system zum stimulieren einer gewebestruktur und magnetstruktur zum implantieren an eine gewebestruktur |
Country Status (6)
Country | Link |
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US (1) | US20210106823A1 (de) |
EP (1) | EP3773890A1 (de) |
AU (1) | AU2019240829A1 (de) |
CA (1) | CA3095228A1 (de) |
DE (1) | DE102018107425B4 (de) |
WO (1) | WO2019185803A1 (de) |
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EP0333381A2 (de) * | 1988-03-16 | 1989-09-20 | Metcal Inc. | Thermisches Element für die Behandlung von Tumoren |
WO1996003112A1 (en) * | 1993-05-04 | 1996-02-08 | Syngenix Limited | Compositions comprising a tissue glue and therapeutic agents |
WO2003022308A2 (en) * | 2001-09-13 | 2003-03-20 | Scientific Generics Limited | Therapeutic insert and therapeutic method |
WO2004016316A1 (ja) * | 2002-08-16 | 2004-02-26 | Admetec Co., Ltd. | 加熱方法及びそのための加熱装置 |
DE102005062746A1 (de) * | 2005-12-23 | 2007-07-05 | Friedrich-Schiller-Universität Jena | Vorrichtung zur zielgerichteten Erwärmung |
WO2007102375A1 (ja) * | 2006-03-09 | 2007-09-13 | Ad Me Tech Co., Ltd. | 生体加熱材料として用いられるMgFe2O4の製造方法及びこの製造方法により得られたMgFe2O4 |
US20080319247A1 (en) * | 2007-06-21 | 2008-12-25 | Philadelphia Health & Education Corporation D/B/A Drexel University College Of Medicine | Method of local therapy using magnetizable thermoplastic implant |
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DE10208391A1 (de) * | 2002-02-27 | 2003-09-25 | Fraunhofer Ges Forschung | Implantat zur lokalen Stimulierung von Muskel- und Nervenzellen |
WO2018071906A1 (en) * | 2016-10-16 | 2018-04-19 | Stimaire, Inc. | Wireless neural stimulator with injectable |
-
2018
- 2018-03-28 DE DE102018107425.5A patent/DE102018107425B4/de active Active
-
2019
- 2019-03-28 CA CA3095228A patent/CA3095228A1/en active Pending
- 2019-03-28 EP EP19714621.0A patent/EP3773890A1/de active Pending
- 2019-03-28 AU AU2019240829A patent/AU2019240829A1/en not_active Abandoned
- 2019-03-28 WO PCT/EP2019/057870 patent/WO2019185803A1/de unknown
- 2019-03-28 US US17/041,091 patent/US20210106823A1/en active Pending
Patent Citations (7)
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EP0333381A2 (de) * | 1988-03-16 | 1989-09-20 | Metcal Inc. | Thermisches Element für die Behandlung von Tumoren |
WO1996003112A1 (en) * | 1993-05-04 | 1996-02-08 | Syngenix Limited | Compositions comprising a tissue glue and therapeutic agents |
WO2003022308A2 (en) * | 2001-09-13 | 2003-03-20 | Scientific Generics Limited | Therapeutic insert and therapeutic method |
WO2004016316A1 (ja) * | 2002-08-16 | 2004-02-26 | Admetec Co., Ltd. | 加熱方法及びそのための加熱装置 |
DE102005062746A1 (de) * | 2005-12-23 | 2007-07-05 | Friedrich-Schiller-Universität Jena | Vorrichtung zur zielgerichteten Erwärmung |
WO2007102375A1 (ja) * | 2006-03-09 | 2007-09-13 | Ad Me Tech Co., Ltd. | 生体加熱材料として用いられるMgFe2O4の製造方法及びこの製造方法により得られたMgFe2O4 |
US20080319247A1 (en) * | 2007-06-21 | 2008-12-25 | Philadelphia Health & Education Corporation D/B/A Drexel University College Of Medicine | Method of local therapy using magnetizable thermoplastic implant |
Also Published As
Publication number | Publication date |
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CA3095228A1 (en) | 2019-10-03 |
EP3773890A1 (de) | 2021-02-17 |
US20210106823A1 (en) | 2021-04-15 |
DE102018107425B4 (de) | 2022-12-01 |
DE102018107425A1 (de) | 2019-10-02 |
AU2019240829A1 (en) | 2020-10-15 |
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