Implant with cavities containing therapeutic agents
First Claim
Patent Images
1. An implant adapted for contacting body tissue and body fluids of humans or animals comprising:
- a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings of substantially uniform shape which are homogenously distributed on the surface of and opening to the surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of a metal oxide formed by electrolytic oxidation, said metal oxide being selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, said cavities being formed by the electrolytic oxidation forming said metal oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm.
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Abstract
The invention relates to an implant and a method for the production of an implant. The implant has a covering layer that is preferably made of aluminium oxide and provided with uniform cavities and separate openings on the surface side of the covering layer in order to receive a therapeutic agent which can be released according to requirements when the implant is in place.
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Citations
48 Claims
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1. An implant adapted for contacting body tissue and body fluids of humans or animals comprising:
a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings of substantially uniform shape which are homogenously distributed on the surface of and opening to the surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of a metal oxide formed by electrolytic oxidation, said metal oxide being selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, said cavities being formed by the electrolytic oxidation forming said metal oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for making an implant adapted for contacting body tissue and body fluids of humans or animals comprising a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings of substantially uniform shape which are homogenously distributed on the surface of and opening to the surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of a metal oxide formed by electrolytic oxidation, said metal oxide being selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, said cavities being formed by the electrolytic oxidation forming said metal oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm, said method comprising the steps of:
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subjecting said implant to low pressure in order to evacuate the cavities;
supplying at least one of a binding agent for the therapeutic agent and the therapeutic agent to said cavities; and
returning the pressure to normal. - View Dependent Claims (39, 40)
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41. A method for making an implant adapted for contacting body tissue and body fluids of humans or animals comprising a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings open to a surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of an electrolytically oxidized metal oxide selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm, said method comprising the steps of:
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providing said cavities with at least one of complexing agents and reaction partners for chemically binding the therapeutic agent therein and, thereafter, introducing said therapeutic agent into said cavities. - View Dependent Claims (42)
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43. A method of treating humans or animals with a therapeutic agent comprising:
contacting body tissue or body fluids of said treated human or animal with an implant containing said therapeutic agent, said implant comprising a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings of substantially uniform shape which are homogenously distributed on the surface of and opening to the surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, at least one therapeutic agent in said cavities, said covering layer consisting essentially of a metal oxide formed by electrolytic oxidation, said metal oxide being selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, said cavities being formed by the electrolytic oxidation forming said metal oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm.
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44. A method for making an implant adapted for contacting body tissue and body fluids of humans or animals comprising a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings open to a surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of an electrolytically oxidized metal oxide selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm, said method comprising the step of:
incorporating at least one of a binding agent for a therapeutic agent and a therapeutic agent into said cavities by means of ultrasound.
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45. An implant adapted for contacting body tissue and body fluids of humans or animals comprising:
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a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings open to a surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of a metal oxide formed by electrolytic oxidation, said metal oxide being selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, said cavities being formed similarly-shaped by the electrolytic oxidation forming said metal oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm, including at least one therapeutic agent in said cavities, wherein said at least one therapeutic agent comprises radioactive material containing a predetermined amount of at least one radionuclide fixed in said cavities, and wherein said radioactive material is chemically bound in said cavities via sulphur groups.
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46. An implant adapted for contacting body tissue and body fluids of humans or animals comprising:
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a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings open to a surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of a metal oxide formed by electrolytic oxidation, said metal oxide being selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, said cavities being formed similarly-shaped by the electrolytic oxidation forming said metal oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm; and
at least one therapeutic agent in said cavities, wherein said therapeutic agent is bound in said cavities and releasable therefrom when a predetermined temperature is exceeded.
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47. A method for making an implant adapted for contacting body tissue and body fluids of humans or animals comprising a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings open to a surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of a metal oxide formed by electrolytic oxidation, said metal oxide being selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, said cavities being formed similarly-shaped by the electrolytic oxidation forming said metal oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm, said method comprising the steps of:
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subjecting said implant to low pressure in order to evacuate the cavities;
supplying at least one of a binding agent for the therapeutic agent and the therapeutic agent to said cavities; and
returning the pressure to normal, wherein at least one of said binding agent and said therapeutic agent are incorporated into said cavities by means of ultrasound.
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48. An implant adapted for contacting body tissue and body fluids of humans or animals comprising:
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a support including an at least partially formed covering layer, said covering layer having a plurality of cavities with separate openings open to a surface of the covering layer, said cavities being adapted for absorbing at least one therapeutic agent, said covering layer consisting essentially of a metal oxide formed by electrolytic oxidation, said metal oxide being selected from the group consisting of aluminum oxide, magnesium oxide, tantalum oxide, iron oxide and tungsten oxide, said cavities being formed similarly-shaped by the electrolytic oxidation forming said metal oxide, and said openings comprising an opening area wherein the average of either the largest or average diameters of said openings is up to 100 nm, wherein said therapeutic agent is bound in said cavities and releasable therefrom when activated by laser or ultrasound.
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Specification