WO2004006805A1 - Beschichtete chirurgische einrichtung und verfahren zu deren herstellung - Google Patents
Beschichtete chirurgische einrichtung und verfahren zu deren herstellung Download PDFInfo
- Publication number
- WO2004006805A1 WO2004006805A1 PCT/EP2003/007732 EP0307732W WO2004006805A1 WO 2004006805 A1 WO2004006805 A1 WO 2004006805A1 EP 0307732 W EP0307732 W EP 0307732W WO 2004006805 A1 WO2004006805 A1 WO 2004006805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- barrier layer
- base material
- layer
- average
- gpa
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/28—Materials for coating prostheses
- A61L27/30—Inorganic materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/28—Materials for coating prostheses
- A61L27/30—Inorganic materials
- A61L27/306—Other specific inorganic materials not covered by A61L27/303 - A61L27/32
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00831—Material properties
- A61B2017/00862—Material properties elastic or resilient
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00831—Material properties
- A61B2017/0088—Material properties ceramic
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00982—General structural features
- A61B2017/00995—General structural features having a thin film
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
- A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
Definitions
- the present invention relates to a surgical device according to the preamble of claim 1 and a method for its production according to the preamble of claim 17.
- surgical device is primarily to be understood here as an implant. In a broader sense, however, it can also be a surgical instrument or surgical tool.
- surgical instrument or “surgical tool” is to be understood here to mean a device or instrument which is used in an operation and / or examination, in particular on the human or animal body, that is to say introduced in particular and / or for example to act on body tissue is used. In a broader sense, however, this also includes other instruments, devices and aids that are used in particular in operations and / or examinations and in particular have contact with the respective body.
- implant here initially means in the narrower sense an element that can be used at least temporarily in the body of an animal or a human being and can, for example, perform therapeutic, support and / or joint functions, such as temporary implants, for example so-called “seeds” for tumor treatment or therapy, or stents, such as tracheal stents, and the like. In a broader sense, however, this also includes elements or the like that can be brought into contact with the body from outside and / or in particular temporarily.
- Implants in the form of stents are used, for example, to support expanded vessels. These mostly tubular inserts are inserted after the widening of narrowed vessels and then expanded radially so that the stents support the inside of the vessel walls.
- BEST ⁇ TIGIWGS & OP in the body, in particular due to the detachment of components of the materials in the body.
- Coatings of implants to protect and to increase biocompatibility are generally known.
- body tolerance body tolerance
- a protective layer or barrier layer in order to prevent unwanted detachment of components or substances in the body are very high.
- the barrier layer should be available inexpensively.
- the barrier layer should adhere well or at least sufficiently well to virtually any surface or base material.
- the barrier layer should be sufficiently flexible so that it does not become detached, for example, when an implant is deformed, such as when a stent is expanded.
- the barrier layer should be sufficiently impermeable, ie have a high barrier effect.
- the barrier layer itself should be very biocompatible (body compatible) and should not release any or at least no undesirable components into the body.
- a metal implant for medical purposes is known.
- This metal implant has a metallic core, on the surface of which a pore-free protective layer made of glass is applied as a metal ion barrier.
- the thickness of the glass layer is in particular about 0.2 mm or more.
- This glass layer is relatively brittle and can therefore not be used for heavy-duty surgical instruments or for implants, in particular stents, since there is a risk of chipping or cracking when subjected to mechanical stress, in particular deformation of the surgical device.
- DE 40 06 379 C2 discloses a method for producing bioactive and mechanically highly resilient medical implants.
- a silicate layer with a layer thickness of 5 to 100 nm is applied to a metal base body, which is then covered by a bioactive glass ceramic.
- the silicate layer consists essentially of Si0 2 and is highly porous. Accordingly, this silicate layer is only suitable for connection to the barrier layer formed by the glass ceramic, but the silicate layer itself does not constitute a barrier layer.
- DE 199 37 864 AI relates to a workpiece and a method for producing the same, in particular implants, such as a hip prosthesis.
- a silicon oxide layer with a silane coupling agent is provided here for the stable connection of a substrate to a polymer.
- the silicon oxide layer does not serve as a barrier layer.
- the present invention is based on the object of specifying a surgical device which has a barrier layer which, with high biocompatibility, is highly impermeable even under high mechanical stress, that is to say exhibits a good barrier effect, and in particular is sufficiently flexible or elastic, and a to issue a simple method of manufacturing such a surgical device.
- An essential idea of the present invention is to form the barrier layer from amorphous, substoichiometric silicon dioxide. This surprisingly enables a highly or sufficiently flexible and elastic barrier layer to be achieved, so that segmentation (flaking) and / or crack formation can be prevented even in mechanically very heavily loaded surgical devices, in particular also when expanding stents.
- a thin barrier layer made of substoichiometric silicon dioxide has a very high or sufficiently high thermal and chemical Stability for use in the medical field or in a surgical facility.
- silicon oxides are highly biocompatible, that is to say they are tolerated by the body, that silicon oxides can be deposited in very thin, amorphous layers, and that silicon oxides, with high flexibility and sufficient hardness, show good adhesion and good durability and abrasion resistance. Further layers are therefore not necessary. "Rather, a simple and therefore inexpensive manufacture of the proposed surgical device is made possible.
- the barrier layer has an average Vickers hardness of at least 50 Vickers and an average elastic modulus of at most 92 GPa. With sufficient strength and resilience, sufficient flexibility can be achieved to prevent chipping and / or undesirable crack formation.
- the barrier layer is preferably produced by evaporation of unoxidized silicon and limited addition of oxygen, so that a sub-stoichiometric silicon dioxide layer is formed. This enables simple, fast and inexpensive production.
- Figure 1 is a partial representation of a schematic structure of a proposed surgical device.
- FIG. 2 shows a schematic illustration of a proposed surgical device in the form of a surgical instrument
- FIG. 3 shows a schematic illustration of a proposed surgical device in the form of an implant designed as a stent.
- 1 shows, in a schematic representation that is not to scale, an enlarged section of a proposed surgical device 1, in particular its material structure.
- This material structure is provided at least in some areas, in particular as a whole, for the surgical device 1.
- this material structure is realized at least in highly stressed areas and / or in areas that come into contact with a human or animal body, not shown, to be treated or examined.
- the surgical device 1 consists at least essentially of a basic material 2 indicated in FIG. 1.
- FIG. 1 shows only a partial section into the material of the surgical device 1.
- the base material 2 can in principle be any material or any material with suitable properties, the primary concern being biocompatibility (body compatibility). If necessary, it can also be a composite material or a composite structure.
- the base material 2 consists in particular of ceramic, metal, a metal alloy and / or a metal compound, preferably of aluminum, an aluminum compound, an aluminum alloy and / or mixtures thereof.
- the device 1 is particularly well suited for examinations in an MRI scanner if the base material 2 consists at least essentially of aluminum.
- the base material 2 is covered by a barrier layer 3 made of silicon oxide on its surface, at least in surface areas 4, which are freely accessible and / or accessible to body fluids or tissues, thereby protecting it from body fluids or other substances of the body.
- the barrier layer 3 is in particular impermeable to the base material 2, ions and / or body fluids formed therefrom or other body-own substances. In this way, unwanted loosening of the base material 2 in the body can be prevented.
- the provided barrier layer 3 is relatively thin and amorphous. This is conducive to good or sufficient flexibility / elasticity.
- the barrier layer 3 is preferably at least substantially uniformly thick.
- the average thickness is 10 to 200 or 500 nm, preferably 20 to 100 nm and in particular up to 50 nm.
- the barrier layer 3 has a good barrier effect even with such a thin design.
- the base material 2 is preferably plasma-coated to form the barrier layer 3, that is to say the barrier layer 3 is applied by a plasma process.
- the material to be applied in particular non-oxidized silicon, is preferably evaporated in vacuo and reacts with the addition of oxygen on the surface of the surgical device 1 or the base material 2 to form a very firmly adhering oxide layer, with appropriate process conditions, namely limited addition of Oxygen, a sub-stoichiometric layer of silicon dioxide is formed.
- the ratio of silicon and oxygen in the barrier layer 3 is controlled by varying the partial pressure of oxygen.
- the following table illustrates the dependence of the silicon-oxygen ratio on the partial pressure of the oxygen during the vaporization of the silicon or with the plasma coating:
- the barrier layer 3 becomes more fine-grained by reducing the oxygen content. This effects or favors the desired good barrier effect of the barrier layer 3.
- the average grain size is only 10 to 80 nm, preferably 10 to 50 nm, in particular a maximum of 30 nm.
- the application is not limited to pure plasma processes; rather, other processes, in particular plasma-assisted processes, such as the plasma-assisted PVD process or the plasma-assisted CVD process, can also be used, as in the article "Character roles" by Volker Bück and Horst Ehrich, Essen unique specimens, materials science, volume 13, University GH Essen / Stuttgartsverlag, ISSN 0944-6060, page 42 f. disclosed.
- the magazine mentioned is additionally mentioned in its entirety as a disclosure with regard to coating processes and usable materials and also with regard to usable biocompatible materials. It is essential, however, that the process conditions are selected, in particular by limited addition of oxygen, that a coating of substoichiometric silicon oxide is formed.
- the barrier layer 3 consists at least essentially, preferably exclusively, of substoichiometric Si0 2-x , with x> 0.01, in particular x> 0.1 or 0.2, preferably x> 0.3, and / or x ⁇ 1.9 , in particular x ⁇ 1.5, preferably x ⁇ 1.0. It has been shown that such a barrier layer 3 has a very good barrier effect with optimal mechanical properties, that is to say sufficient flexibility or elasticity and sufficient hardness to avoid undesired detachment and to achieve sufficient durability or durability. In addition, the proposed barrier layer 3 is sufficiently thermally and chemically stable. The barrier layer 3 is preferably applied directly, in particular without an intermediate layer or adhesion promoter, to the base material 2.
- the barrier layer 3 preferably forms the outermost layer or cover layer of the device 1.
- Fig. 2 shows a schematic representation of a proposed surgical device 1.
- the example shown is a surgical instrument 5 in the sense mentioned at the beginning, which is designed here like forceps. As already explained, however, this can be any type of instrument, technical aid or tool for examinations and / or operations on the human or animal body.
- the surgical instrument 5 preferably has at least one working section 6, here two working sections 6.
- the working sections 6 form pliers-like gripping, holding and / or cutting elements.
- the term “working section” is not limited to a single part, but rather it can also be a plurality of parts on the one hand or a section or area of a one-piece part on the other hand.
- the working section 6 is the front or relevant area of the surgical instrument 5, which comes into contact with the body (not shown) during an operation or examination.
- At least the working section 6, preferably the entire instrument 5, is preferably provided with the proposed barrier layer 3.
- FIG. 3 shows a perspective, greatly simplified illustration for reasons of illustration, a proposed surgical device 1 in the form of an implant 7, which is designed here as a stent 8.
- the implant 7 forms a grid-like, tubular body.
- functions and applications of the implant 7, reference is made to the definition on the input side.
- the implant 7 or the stent 8 is preferably completely provided with the proposed barrier layer 8.
- the mechanical properties of various samples were determined and are given below:
- the layer thickness of the barrier layers of samples a to c was approximately 500 nm.
- the layer thickness of the barrier layer of sample d was approximately 10 ⁇ m.
- Hv indicates the Vickers hardness
- H the so-called universal hardness
- E the modulus of elasticity
- the maximum load being 0.1 mN and the loading / unloading speed 0.2 mN / min in the case of samples a to c and in the case of Sample d 10.00 mN at 20.0 mN / min and a Poisson factor of 0.3 was assumed to determine the modulus of elasticity.
- Samples a through c were made by plasma coating as described above.
- the barrier layer was applied using an inorganic polymer, ie chemically.
- the much poorer mechanical properties or characteristic values are striking here.
- the barrier layers a to c produced by the plasma process differ significantly from that chemically produced barrier layer d by more than an order of magnitude.
- the barrier layer 3 has an average Vickers hardness of at least 300 Vickers, in particular at least 400 or 500 Vickers, and / or at most 600 or 800 Vickers, and / or if the barrier layer 3 has an average elastic modulus of at most 90 GPa, in particular at most 88 GPa, and / or from at least 50 or 80 GPa.
- Unintentional segmentation, ie chipping, of the barrier layer is preferably further avoided in that the barrier layer 3 has an elasticity module that is greater than or equal to the elasticity module of the base material 2 and / or another carrier layer that supports the barrier layer.
- the proposed barrier layer is preferably harder than a plastic layer, but more elastic than a coating made of ceramic or metal.
- the measured Si; 0 ratios were determined using a scanning tunnel electron microscope on the basis of X-ray fluorescence or EDX and can have certain errors.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003250970A AU2003250970A1 (en) | 2002-07-17 | 2003-07-16 | Coated surgical device and method for the production thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10232480.8 | 2002-07-17 | ||
DE10232480 | 2002-07-17 | ||
DE10243092A DE10243092B4 (de) | 2002-07-17 | 2002-09-16 | Chirurgische Einrichtung |
DE10243092.6 | 2002-09-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004006805A1 true WO2004006805A1 (de) | 2004-01-22 |
Family
ID=30116649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/007732 WO2004006805A1 (de) | 2002-07-17 | 2003-07-16 | Beschichtete chirurgische einrichtung und verfahren zu deren herstellung |
Country Status (2)
Country | Link |
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AU (1) | AU2003250970A1 (de) |
WO (1) | WO2004006805A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4917786A (en) * | 1984-04-12 | 1990-04-17 | Horst Ehrich | Method and apparatus for evaporating material in vacuum |
EP0371908A1 (de) * | 1988-11-29 | 1990-06-06 | BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin | Implantat |
DE19811900A1 (de) * | 1998-03-18 | 1999-09-23 | Feinchemie Gmbh Sebnitz | Biokompatibles Kompositmaterial |
DE19937864A1 (de) * | 1999-08-13 | 2001-02-22 | Rudolf Marx | Werkstück und Verfahren zum Herstellen und zum Verwerten des Werkstückes |
-
2003
- 2003-07-16 WO PCT/EP2003/007732 patent/WO2004006805A1/de not_active Application Discontinuation
- 2003-07-16 AU AU2003250970A patent/AU2003250970A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4917786A (en) * | 1984-04-12 | 1990-04-17 | Horst Ehrich | Method and apparatus for evaporating material in vacuum |
EP0371908A1 (de) * | 1988-11-29 | 1990-06-06 | BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin | Implantat |
DE19811900A1 (de) * | 1998-03-18 | 1999-09-23 | Feinchemie Gmbh Sebnitz | Biokompatibles Kompositmaterial |
DE19937864A1 (de) * | 1999-08-13 | 2001-02-22 | Rudolf Marx | Werkstück und Verfahren zum Herstellen und zum Verwerten des Werkstückes |
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Publication number | Publication date |
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AU2003250970A1 (en) | 2004-02-02 |
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