EP0969696A2 - Implantable medical device - Google Patents
Implantable medical device Download PDFInfo
- Publication number
- EP0969696A2 EP0969696A2 EP98115845A EP98115845A EP0969696A2 EP 0969696 A2 EP0969696 A2 EP 0969696A2 EP 98115845 A EP98115845 A EP 98115845A EP 98115845 A EP98115845 A EP 98115845A EP 0969696 A2 EP0969696 A2 EP 0969696A2
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- EP
- European Patent Office
- Prior art keywords
- housing
- medical implant
- implant according
- range
- angle
- 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.)
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- 239000007943 implant Substances 0.000 claims abstract description 45
- 210000000988 bone and bone Anatomy 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 9
- SEQDDYPDSLOBDC-UHFFFAOYSA-N Temazepam Chemical compound N=1C(O)C(=O)N(C)C2=CC=C(Cl)C=C2C=1C1=CC=CC=C1 SEQDDYPDSLOBDC-UHFFFAOYSA-N 0.000 claims description 5
- 210000001595 mastoid Anatomy 0.000 claims description 5
- 210000003625 skull Anatomy 0.000 claims description 5
- 238000002513 implantation Methods 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 230000007794 irritation Effects 0.000 claims description 3
- 210000003027 ear inner Anatomy 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 241000050051 Chelone glabra Species 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 208000009205 Tinnitus Diseases 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 210000000959 ear middle Anatomy 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000002207 retinal effect Effects 0.000 description 1
- 229920000260 silastic Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 231100000886 tinnitus Toxicity 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
- H04R25/604—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers
- H04R25/606—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window
Definitions
- the invention relates to a medical implant for implantation in a Outside of the skull, especially in the area of the planum mastoid Bone bed is suitable and has a hermetically sealed housing, in which an electronic arrangement and possibly further components or Assemblies are housed.
- Implants of this type are, inter alia, from DE 39 18 086 C1 and DE 39 18 329 A1 known.
- Size especially the depth, of the bone bed must be kept as small as possible and is limited by the anatomical conditions, and that on the other hand a An unwanted protrusion of the housing over the outer edge of the bone bed Bulging of the skin over the implant would result and therefore as far as possible is possible to avoid.
- the problem worsens the larger the volume requirement in the housing, for example because of the complexity of the electronics to be accommodated or other components, such as a power supply unit or parts of one such unity.
- the flexibility of the flap adapts to the shape of the skull, is however with regard to a risk of breaking the connections between those in the Rag added components and the components problematic in the Titanium case are housed.
- the thickness of the flexible flap is that is maximum permissible so that the skin over the rag does not interfere bulges, so severely restricted that this solution also for many reasons of space Implant components.
- the invention has for its object a medical implant of the beginning to create the type mentioned, which allows, given a given size, in particular depth, the bone bed to provide a particularly large housing volume, while at the same time, a projection of the housing completely over the outer wheel of the bone bed or at least largely avoided.
- a medical Implant that is intended for implantation in one on the outside of the skull, in particular in the area of the planum mastoid, trained bone bed is suitable and has a hermetically sealed housing in which an electronic arrangement and, if necessary, further components or assemblies are accommodated Housing is provided in at least one level with at least one kink that is dimensioned such that a tangent to a plane perpendicular to the direction of buckling the bottom of the housing at one end of the housing with a tangent to the bottom of the housing at the other end of the housing forms an angle in the range of 5 ° to 25 °.
- the housing is preferably in the region of its middle third, in particular approximately in the middle, in at least one plane through an angle in the range of 5 ° to 25 ° kinked.
- the housing in at least to bend or bend a layer several times.
- the angle that the tangents to the bottom of the case on one and the other Forming the housing end together is preferably in the range of 7 ° to 15 °. As An angle of approximately 10 ° has proven particularly favorable.
- the largest dimension of the housing is in Range from 30 to 55 mm, and preferably in the range from 38 to 50 mm, while the direction of buckling is perpendicular to this largest dimension.
- the smallest dimension (thickness) of the housing is expediently in the range from 4 to 8 mm.
- the housing is advantageously rigid, which creates mechanical stresses the components housed therein and their mutual connections as far as possible be avoided.
- the housing can at least partly consist of ceramic material and in particular with a Ceramic housing part and a metal housing part.
- a housing training leads to a housing that is at least partially for electrical, magnetic and electromagnetic fields is transparent. This is essential if, for example a receiving and / or transmitting antenna is to be accommodated in the housing.
- the housing can also be a metal housing.
- a housing with a ceramic housing part and a metal housing part advantageous the kink near the meeting point of the ceramic housing part and metal housing part.
- an energy supply unit or the implantable part of such a unit and an electronics unit his.
- the implant can in particular be part of an at least partially implantable Hearing aid, in particular an active hearing aid for mechanical or electrical irritation of the inner ear, such as that described in DE 39 18 086 C1, DE 39 18 329 A1, DE 39 40 632 C1, DE 41 04 359 C2 and US Pat. No. 4,419,995 are known or are described in the older DE patent application 196 38 159.2.
- the invention is in no way limited to this. Rather, it is suitable in in the same way for any other implants in which the implantation site is Skull, especially in the area of the planum mastoid, comes into question. Examples of such implants, to name a few, are tinnitus suppression systems, Drug pumps and retinal stimulators.
- the illustrated implant 10 has a housing 11 with a ceramic housing part 12 and a metal housing part 13.
- the housing 11 is inserted into a bone bed 14, that on the outside 15 of a skull cap 16, in particular in the area of the Planum mastoid, is formed.
- the ceramic housing part 12 the receiving coil of an energy charging system for recharging an energy store of the implant.
- an energy charging system is from DE 41 04 359 C2 is known and therefore does not require any further explanation in the present case.
- the Metal housing part 13 can accommodate an electronic module that is connected to the receiving coil is in electrical connection and is fed from the rechargeable energy store.
- the electronics module can in turn be part of an active hearing aid for mechanical or electrical irritation to the middle ear.
- Such electronic modules can also trained in a conventional manner (see the references mentioned above) his.
- the housing 11 is in the region of its middle One-third kinked, the kink line 18 running perpendicular to the longitudinal dimension of the housing.
- the kink 18 is near the meeting point of the ceramic housing part 12 and Metal housing part 13.
- the kink is dimensioned such that in one to the direction of buckling vertical plane a tangent to the housing bottom 19 at one Housing end 20 with a tangent to the housing underside at the other housing end 21 forms an angle ⁇ in the range from 5 ° to 25 °.
- The is preferably Angle ⁇ about 10 °.
- the largest dimension of the housing 11, that is Longitudinal housing dimension can suitably be in the range of 30 to 55 mm, and the housing 11 can generally have a smallest dimension (thickness) in the range of 4 to 8 mm.
- One or more connecting cables 23 can be made from the hermetically sealed housing 11 be led out.
- a contact arrangement of the type known from DE 196 22 669 A1 can be provided, these Contact arrangement sits under a removable cover 25 of the implant 10.
- the aforementioned reception coil is shown schematically at 26 in FIG. 2.
- the coil 26 can additionally or instead also be used as a transmitter coil, for example around To transmit information from the implant to an extracorporeal receiving device.
- FIG. 4 shows a housing 11 'which is bent twice, while in FIG. 5 a curved one Housing 11 '' is illustrated. This is also a requirement for housings 11 'and 11' ' fulfilled that in a plane perpendicular to the direction of buckling a tangent to the underside of the housing 19 at one housing end 20 with a tangent to the housing underside at the other housing end 21 forms an angle ⁇ in the range from 5 ° to 25 °.
- the housing materials can be selected in a known manner.
- metallic materials come in particular titanium, titanium alloys, niobium, niobium alloys, cobalt-chromium alloys and stainless steels are considered, which are biocompatible and corrosion-resistant are.
- Suitable ceramic materials include aluminum oxide and boron nitride.
Abstract
Description
Die Erfindung betrifft ein medizinisches Implantat, das zur Implantation in einem an der Außenseite der Schädelkalotte, insbesondere im Bereich des Planum Mastoideum, ausgebildeten Knochenbett geeignet ist und ein hermetisch abgedichtetes Gehäuse aufweist, in dem eine Elektronikanordnung und gegebenenfalls weitere Komponenten oder Baugruppen untergebracht sind.The invention relates to a medical implant for implantation in a Outside of the skull, especially in the area of the planum mastoid Bone bed is suitable and has a hermetically sealed housing, in which an electronic arrangement and possibly further components or Assemblies are housed.
Implantate dieser Art sind unter anderem aus DE 39 18 086 C1 und DE 39 18 329 A1 bekannt. Bei der Gestaltung solcher Implantate ist zu berücksichtigen, daß einerseits die Größe, insbesondere die Tiefe, des Knochenbettes möglichst klein gehalten werden muß und durch die anatomischen Gegebenheiten beschränkt ist, und daß andererseits ein Überstehen des Gehäuses über den Außenrand des Knochenbettes ein unerwünschtes Auswölben der Haut über dem Implantat zur Folge hätte und deshalb soweit wie irgend möglich zu vermeiden ist. Das Problem verschärft sich, je größer der Volumenbedarf in dem Gehäuse ist, zum Beispiel wegen der Komplexität der unterzubringenden Elektronik oder sonstiger Komponenten, wie einer Energieversorgungeinheit oder Teile einer solchen Einheit.Implants of this type are, inter alia, from DE 39 18 086 C1 and DE 39 18 329 A1 known. When designing such implants it should be borne in mind that on the one hand the Size, especially the depth, of the bone bed must be kept as small as possible and is limited by the anatomical conditions, and that on the other hand a An unwanted protrusion of the housing over the outer edge of the bone bed Bulging of the skin over the implant would result and therefore as far as possible is possible to avoid. The problem worsens the larger the volume requirement in the housing, for example because of the complexity of the electronics to be accommodated or other components, such as a power supply unit or parts of one such unity.
Bei bekannten implantierbaren Cochlea-Implantaten (Nucleus® 22 und Nucleus® 24 Cochlea Implant System der Firma Cochlear AG) hat man ein Empfänger/Stimulator-Elektronikmodul in einem Titangehäuse untergebracht, das mit einer Silastikummantelung versehen ist. Die Silastikummantelung bildet einen flexiblen Lappen, der sich von der einen Seite des Titangehäuses wegerstreckt und ein Empfangsantennenspule samt Magnet aufnimmt. Nur das Titangehäuse wird in das Knochenbett eingesetzt, während der flexible Lappen so dünn (beispielsweise 2,5 mm) gehalten wird, daß er auf die Außenseite der Schädelkalotte aufgelegt werden kann, um dann von Haut überdeckt zu werden. Der flexible Silastiklappen kann jedoch nicht für eine hermetisch gasdichte Ummantelung der darin eingeschlossenen Komponenten sorgen. Die Flexibilität des Lappens erlaubt zwar eine Formanpassung an den Verlauf der Schädelkalotte, ist aber im Hinblick auf eine Bruchgefährdung der Verbindungen zwischen den in dem Lappen aufgenommen Komponenten und den Komponenten problematisch, die in dem Titangehäuse untergebracht sind. Außerdem ist die Dicke des flexiblen Lappens, die maximal zulässig ist, damit sich die Haut über dem Lappen nicht in störender Weise vorwölbt, so stark beschränkt, daß diese Lösung auch aus Platzgründen für viele Implantatkomponenten ausscheidet.With known implantable cochlear implants (Nucleus® 22 and Nucleus® 24 Cochlear Implant System from Cochlear AG) you have a receiver / stimulator electronics module housed in a titanium case with a silastic coating is provided. The silica cladding forms a flexible flap that extends from one side of the titanium case and a receiving antenna coil including magnet. Only the titanium case is in the bone bed inserted while the flexible flap is kept so thin (for example 2.5 mm) that it can be placed on the outside of the skull cap, then from skin to be covered. However, the flexible silica flap cannot be hermetic ensure gas-tight sheathing of the enclosed components. The flexibility of the flap adapts to the shape of the skull, is however with regard to a risk of breaking the connections between those in the Rag added components and the components problematic in the Titanium case are housed. In addition, the thickness of the flexible flap is that is maximum permissible so that the skin over the rag does not interfere bulges, so severely restricted that this solution also for many reasons of space Implant components.
Der Erfindung liegt die Aufgabe zugrunde, ein medizinisches Implantat der eingangs genannten Art zu schaffen, das es erlaubt, bei vorgegebener Größe, insbesondere Tiefe, des Knochenbettes, ein besonders großes Gehäusevolumen bereitzustellen, während gleichzeitig ein Überstehen des Gehäuses über den Außenrad des Knochenbettes ganz oder mindestens weitgehend vermieden wird.The invention has for its object a medical implant of the beginning to create the type mentioned, which allows, given a given size, in particular depth, the bone bed to provide a particularly large housing volume, while at the same time, a projection of the housing completely over the outer wheel of the bone bed or at least largely avoided.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß bei einem medizinischen Implantat, das zur Implantation in einem an der Außenseite der Schädelkalotte, insbesondere im Bereich des Planum Mastoideum, ausgebildeten Knochenbett geeignet ist und ein hermetisch abgedichtetes Gehäuse aufweist, in dem eine Elektronikanordnung und gegebenenfalls weitere Komponenten oder Baugruppen untergebracht sind, das Gehäuse in mindestens einer Ebene mit mindestens einer Abknickung versehen ist, die derart bemessen ist, daß in einer zur Knickrichtung senkrechten Ebene eine Tangente an die Gehäuseunterseite am einen Gehäuseende mit einer Tangente an die Gehäuseunterseite am anderen Gehäuseende einen Winkel im Bereich von 5° bis 25° bildet.This object is achieved in that in a medical Implant that is intended for implantation in one on the outside of the skull, in particular in the area of the planum mastoid, trained bone bed is suitable and has a hermetically sealed housing in which an electronic arrangement and, if necessary, further components or assemblies are accommodated Housing is provided in at least one level with at least one kink that is dimensioned such that a tangent to a plane perpendicular to the direction of buckling the bottom of the housing at one end of the housing with a tangent to the bottom of the housing at the other end of the housing forms an angle in the range of 5 ° to 25 °.
Umfangreiche klinische Versuche haben gezeigt, daß bei einer solchen Ausbildung des Implantatgehäuses eine befriedigende, übermäßige Prominenz (das heißt Vorragen des Implantats über den Außenrand des Knochenbettes) vermeidende Implantierbarkeit auch dann noch gewährleistet ist, wenn bei vorgegebener Knochenbettgröße das Gehäusevolumen im Vergleich zu dem Gehäusevolumen eines nicht geknickten Gehäuses wesentlich vergrößert ist.Extensive clinical trials have shown that with such training the Implant housing a satisfactory, excessive prominence (i.e., protrusion of the Implantability over the outer edge of the bone bed) avoidable implantability is also guaranteed if the housing volume is given a given bone bed size compared to the housing volume of a non-kinked housing is significantly enlarged.
Vorzugsweise ist das Gehäuse im Bereich seines mittleren Drittels, insbesondere etwa in der Mitte, in mindestens einer Ebene um einen Winkel im Bereich von 5° bis 25° abgeknickt.The housing is preferably in the region of its middle third, in particular approximately in the middle, in at least one plane through an angle in the range of 5 ° to 25 ° kinked.
Unter Umständen kann es sich als zweckmäßig erweisen, das Gehäuse in mindestens einer Ebene mehrfach abzuknicken oder zu krümmen.Under certain circumstances, it may prove expedient to have the housing in at least to bend or bend a layer several times.
Der Winkel, den die Tangenten an die Gehäuseunterseite am einen und am anderen Gehäuseende miteinander bilden, liegt vorzugsweise im Bereich von 7° bis 15°. Als besonders günstig hat sich ein Winkel von etwa 10° erwiesen.The angle that the tangents to the bottom of the case on one and the other Forming the housing end together is preferably in the range of 7 ° to 15 °. As An angle of approximately 10 ° has proven particularly favorable.
In weiterer Ausgestaltung der Erfindung liegt die größte Abmessung des Gehäuses im Bereich von 30 bis 55 mm und vorzugsweise im Bereich von 38 bis 50 mm, während die Knickrichtung senkrecht zu dieser größten Abmessung verläuft.In a further embodiment of the invention, the largest dimension of the housing is in Range from 30 to 55 mm, and preferably in the range from 38 to 50 mm, while the direction of buckling is perpendicular to this largest dimension.
Die kleinste Abmessung (Dicke) des Gehäuses liegt zweckmäßig im Bereich von 4 bis-8 mm.The smallest dimension (thickness) of the housing is expediently in the range from 4 to 8 mm.
Das Gehäuse ist vorteilhaft starr ausgebildet, wodurch mechanische Beanspruchungen der darin untergebrachten Komponenten und ihrer gegenseitigen Verbindungen weitestgehend vermieden werden.The housing is advantageously rigid, which creates mechanical stresses the components housed therein and their mutual connections as far as possible be avoided.
In an sich bekannter Weise (zum Beispiel US-PS 4 991 582) kann das Gehäuse mindestens zum Teil aus keramischem Werkstoff bestehen und insbesondere mit einem Keramikgehäuseteil und einem Metallgehäuseteil versehen sein. Eine solche Gehäuseausbildung führt zu einem Gehäuse, das mindestens teilweise für elektrische, magnetische und elekromagnetische Felder transparent ist. Das ist wesentlich, wenn beispielsweise in dem Gehäuse eine Empfangs- und/oder Sendeantenne unterzubringen ist. Es versteht sich jedoch, daß je nach der speziellen Auslegung des Implantats das Gehäuse auch ein Metallgehäuse sein kann. In a manner known per se (for example US Pat. No. 4,991,582), the housing can at least partly consist of ceramic material and in particular with a Ceramic housing part and a metal housing part. Such a housing training leads to a housing that is at least partially for electrical, magnetic and electromagnetic fields is transparent. This is essential if, for example a receiving and / or transmitting antenna is to be accommodated in the housing. It However, it is understood that depending on the specific design of the implant, the housing can also be a metal housing.
Bei einem Gehäuse mit einem Keramikgehäuseteil und einem Metallgehäuseteil liegt vorteilhaft der Knick in der Nähe der Treffstelle von Keramikgehäuseteil und Metallgehäuseteil.With a housing with a ceramic housing part and a metal housing part advantageous the kink near the meeting point of the ceramic housing part and metal housing part.
In dem Gehäuse können insbesondere eine Enenergieversorgungseinheit oder der implantierbare Teil einer solchen Einheit sowie eine Elektronikeinheit untergebracht sein.In particular, an energy supply unit or the implantable part of such a unit and an electronics unit his.
Das Implantat kann insbesondere als Teil einer mindestens teilweise implantierbaren Hörhilfe, insbesondere einer aktiven Hörhilfe zur mechanischen oder elektrischen Reizung des Innenohres, ausgebildet sein, wie sie beispielsweise aus DE 39 18 086 C1, DE 39 18 329 A1, DE 39 40 632 C1, DE 41 04 359 C2 und US-PS 4 419 995 bekannt beziehungsweise in der älteren DE-Patentanmeldung 196 38 159.2 beschrieben sind. Die Erfindung ist darauf jedoch keineswegs beschränkt. Sie eignet sich vielmehr in gleicher Weise für beliebige andere Implantate, bei denen als Implantationsort die Schädelkalotte, insbesondere im Bereich des Planum Mastoideum, in Frage kommt. Beispiele für solche Implantate sind, um nur einige zu nennen, Tinnitus-Unterdrückungssysteme, Medikamentenpumpen und Retinastimulatoren.The implant can in particular be part of an at least partially implantable Hearing aid, in particular an active hearing aid for mechanical or electrical irritation of the inner ear, such as that described in DE 39 18 086 C1, DE 39 18 329 A1, DE 39 40 632 C1, DE 41 04 359 C2 and US Pat. No. 4,419,995 are known or are described in the older DE patent application 196 38 159.2. However, the invention is in no way limited to this. Rather, it is suitable in in the same way for any other implants in which the implantation site is Skull, especially in the area of the planum mastoid, comes into question. Examples of such implants, to name a few, are tinnitus suppression systems, Drug pumps and retinal stimulators.
Bevorzugte Ausführungsbeispiele der Anordnung nach der Erfindung sind nachstehend anhand der beiliegenden Zeichnungen näher erläutert. Es zeigen:
- Fig. 1
- eine Seitenansicht eines medizinischen Implantats, das in ein Knochenbett an der Außenseite der Schädelkalotte eingepaßt ist,
- Fig. 2
- eine Draufsicht auf das Implantat gemäß Fig. 1,
- Fig. 3
- eine Stirnansicht des Implantats gemäß Fig. 1
- Fig. 4
- eine Seitenansicht eines medizinischen Implantats mit in einer Ebene mehrfach abgeknicktem Gehäuse, und
- Fig. 5
- eine Seitenansicht eines medizinischen Implantats mit in einer Ebene gekrümmtem Gehäuse.
- Fig. 1
- 2 shows a side view of a medical implant which is fitted into a bone bed on the outside of the skull cap,
- Fig. 2
- 2 shows a top view of the implant according to FIG. 1,
- Fig. 3
- 3 shows an end view of the implant according to FIG. 1
- Fig. 4
- a side view of a medical implant with multiple folds in one plane housing, and
- Fig. 5
- a side view of a medical implant with a curved housing in one plane.
Das veranschaulichte Implantat 10 weist ein Gehäuse 11 mit einem Keramikgehäuseteil
12 und einem Metallgehäuseteil 13 auf. Das Gehäuse 11 ist in ein Knochenbett 14 eingesetzt,
das an der Außenseite 15 einer Schädelkalotte 16, insbesondere im Bereich des
Planum Mastoideum, ausgebildet ist. In dem Keramikgehäuseteil 12 kann beispielsweise
die Empfangsspule eines Energieladesystems zum Nachladen eines Energiespeichers
des Implantats untergebracht sein. Ein solches Energieladesystem ist aus DE 41
04 359 C2 bekannt und bedarf daher vorliegend keiner näheren Erläuterung. Der
Metallgehäuseteil 13 kann ein Elektronikmodul aufnehmen, das mit der Empfangsspule
in elektrischer Verbindung steht und aus dem nachladbaren Energiespeicher gespeist ist.
Das Elektronikmodul kann seinerseits Teil einer aktiven Hörhilfe zur mechanischen
oder elektrischen Reizung des Mittelohrs sein. Solche Elektronikmodule können gleichfalls
in an sich bekannter Weise (siehe die vorstehend genannten Literaturstellen) ausgebildet
sein.The illustrated
Das Gehäuse 11 ist, wie insbesondere aus Fig. 1 hervorgeht, im Bereich seines mittleren
Drittels geknickt, wobei die Knicklinie 18 senkrecht zur Gehäuselängsabmessung verläuft.
Der Knick 18 liegt in der Nähe der Treffstelle von Keramikgehäuseteil 12 und
Metallgehäuseteil 13. Die Abknickung ist derart bemessen, daß in einer zur Knickrichtung
senkrechten Ebene eine Tangente an die Gehäuseunterseite 19 am einen
Gehäuseende 20 mit einer Tangente an die Gehäuseunterseite am anderen Gehäuseende
21 einen Winkel α im Bereich von 5° bis 25° bildet. Vorzugsweise beträgt der
Winkel α etwa 10°. Die größte Abmessung des Gehäuses 11, das heißt die
Gehäuselängsabmessung, kann zweckmäßig im Bereich von 30 bis 55 mm liegen, und
das Gehäuses 11 kann im allgemeinen eine kleinste Abmessung (Dicke) im Bereich von
4 bis 8 mm haben.As can be seen in particular from FIG. 1, the
Aus dem hermetisch dichten Gehäuse 11 können ein oder mehrere Anschlußkabel 23
herausgeführt sein. Zur lösbaren Verbindung der Anschlußkabel 23 mit dem in Fig. 2
bei 24 angedeuteten Elektronikmodul in dem Metallgehäuseteil 13 kann eine Kontaktanordnung
der aus DE 196 22 669 A1 bekannten Art vorgesehen sein, wobei diese
Kontaktanordnung unter einem abnehmbaren Deckel 25 des Implantats 10 sitzt. Die
zuvor erwähnte Empfangsspule ist in Fig. 2 bei 26 schematisch dargestellt. Die Spule 26
kann zusätzlich oder stattdessen auch als Sendespule genutzt sein, beispielsweise um
Informationen aus dem Implantat an ein extrakorporales Empfangsgerät zu übermitteln.One or more
Fig.4 zeigt ein zweifach abgeknicktes Gehäuse 11', während in Fig. 5 ein gekrümmtes
Gehäuse 11'' veranschaulicht ist. Auch bei den Gehäusen 11' und 11'' ist die Bedingung
erfüllt, daß in einer zur Knickrichtung senkrechten Ebene eine Tangente an die Gehäuseunterseite
19 am einen Gehäuseende 20 mit einer Tangente an die Gehäuseunterseite
am anderen Gehäuseende 21 einen Winkel α im Bereich von 5° bis 25° bildet.FIG. 4 shows a housing 11 'which is bent twice, while in FIG. 5 a curved one
Housing 11 '' is illustrated. This is also a requirement for housings 11 'and 11' '
fulfilled that in a plane perpendicular to the direction of buckling a tangent to the underside of the
Insbesondere bei relativ breiten Gehäusen kann es sich als zweckmäßig erweisen, für eine oder mehrere Abknickungen oder eine Krümmung nicht nur in Gehäuselängsrichtung, sondern auch in Gehäusequerrichtung zu sorgen.Especially with relatively wide housings, it can prove to be useful for one or more kinks or a bend not only in the longitudinal direction of the housing, but also in the transverse direction of the housing.
Die Gehäusewerkstoffe können in bekannter Weise gewählt sein. Als metallische Werkstoffe kommen insbesondere Titan, Titanlegierungen, Niob, Nioblegierungen, Kobalt-Chrom-Legierungen und rostfreie Stähle in Betracht, die biokompatibel und korrosionsfest sind. Zu geeigneten keramischen Werkstoffen gehören unter anderem Aluminiumoxid und Bornitrid.The housing materials can be selected in a known manner. As metallic materials come in particular titanium, titanium alloys, niobium, niobium alloys, cobalt-chromium alloys and stainless steels are considered, which are biocompatible and corrosion-resistant are. Suitable ceramic materials include aluminum oxide and boron nitride.
Claims (20)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19829637 | 1998-07-02 | ||
| DE19829637A DE19829637C2 (en) | 1998-07-02 | 1998-07-02 | Medical implant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0969696A2 true EP0969696A2 (en) | 2000-01-05 |
Family
ID=7872796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98115845A Withdrawn EP0969696A2 (en) | 1998-07-02 | 1998-08-21 | Implantable medical device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6176879B1 (en) |
| EP (1) | EP0969696A2 (en) |
| AU (1) | AU760215B2 (en) |
| CA (1) | CA2265221C (en) |
| DE (1) | DE19829637C2 (en) |
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- 1998-07-02 DE DE19829637A patent/DE19829637C2/en not_active Expired - Fee Related
- 1998-08-21 EP EP98115845A patent/EP0969696A2/en not_active Withdrawn
- 1998-12-11 US US09/209,275 patent/US6176879B1/en not_active Expired - Lifetime
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Also Published As
| Publication number | Publication date |
|---|---|
| CA2265221A1 (en) | 2000-01-02 |
| DE19829637C2 (en) | 2000-10-19 |
| CA2265221C (en) | 2002-05-28 |
| AU760215B2 (en) | 2003-05-08 |
| US6176879B1 (en) | 2001-01-23 |
| DE19829637A1 (en) | 2000-01-20 |
| AU2697099A (en) | 2000-01-20 |
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