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US 5,152,795 AGranted
Surgical implants and method
AssigneeSpire Corporation
InventorsPiran Sioshansi, Richard W. Oliver
Life of this patent
Estimating the term…
Abstract
An improved surgical implant, including dental implants, formed of Ti and its alloys and a process of its manufacture are disclosed. The improved surgical implant is designed to withstand fretting wear and abrasion occasioned by vibrating micromotion of the implant against the surrounding bone structure. Such micromotion has caused undesirable blackening in the surrounding tissue and has required premature replacement of the implant.
Claims8
A surgical implant comprising:
- (a) a modular implant formed of Ti and its alloys and including a tapered section and a ball section, said tapered section having an outside surface and formed of a proximal and a distal part;
- (b) said outside surface of said tapered section, including said proximal and said distal part of said implant being ion implanted with one of a group consisting of N.sup.+, N.sub.2.sup.+, C.sup.+, Ti.sup.+, and O.sup.+ ;
- (c) said ion implantation being effected with an ion beam possessing an energy between about 20 keV and about 360 keV, a current density between about 5.times.10.sup.16 and about 3.times.10.sup.18 ions/cm.sup.2 ;
- (d) said tapered section of said implant being formed of one of a group consisting of commercially pure titanium and Ti-6Al-4V;
- (e) said tapered section of said implant tapering toward a distal tip of said distal part;
- (f) a member formed with an axial opening configured to fit about a middle part of said bone fixation portion and dimensioned for centering said implant, said member also being ion implanted with one of said group;
- (g) said axial opening of said member tapered complementary to said taper of said bone fixation portion;
- (h) said ion implantation creating a surface region of the ion implanted surfaces characterized by improved resistance to fretting, abrasion and chemical attack and a surface region with a microhardness of at least 500 Knoop for a 2 gram load.
5 more elements
A surgical implant comprising:
- (a) an implant formed of Ti and its alloys, said implant being a dental implant;
- (b) said dental implant comprising a bone fixation portion and a crown fixation portion;
- (c) the outside surfaces of said dental implant being ion implanted with one of a group consisting of N.sup.+, N.sub.2.sup.+ C.sup.+, Ti.sup.+ and O.sup.+ ;
- said ion implantation being effected with an ion beam possessing an energy between about 20 keV and about 360 keV, a current density between about 5.times.10.sup..noteq. and about 3.times.10.sup.18 ions/cm.sup.2 ;
- (d) said ion implantation creating a surface region of the ion implanted surfaces characterized by improved resistance to chemical attach and a microhardness of at least about 500 Knoop for a 2 gram load.
2 more elements
Dependencies are inferred from the claim text.