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US 2003/0120279 A1Published application
Implant having circumferentially oriented roughness
AssigneeAstraZeneca AB
InventorStig Hansson
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AssigneeAstraZeneca AB
InventorStig Hansson
Estimating the term…
Implant (10) having a shaft which is adapted in use to be embedded in bone tissue and which has an outer surface provided with a circumferentially-oriented roughness. The circumferentially-oriented roughness has first and second axial sections (19, 21) with each section comprising a series of circumferentially-oriented peaks which have a crest and which are axially spaced apart by troughs. The axial spacing (d) between the crests of adjacent peaks in the first axial section (19) is less than the axial spacing (3d) between the crests of adjacent peaks in the second axial section (21). Although the axial spacing between the crests of adjacent peaks in the first and second axial sections of circumferentially-oriented roughness differs, the first and second axial sections of circumferentially-oriented roughness are adapted in use to provide the same or substantially the same pitch.
An implant (10) having a shaft which is adapted in use to be embedded in bone tissue and which has an outer surface provided with a circumferentially-oriented roughness characterised in that the circumferentially-oriented roughness has first and second axial sections (19, 21), each section comprising a series of circumferentially-oriented peaks which have a crest and are axially spaced apart by troughs, that the axial spacing (d) between the crests of adjacent peaks in the first axial section (19) is less than the axial spacing (3d) between the crests of adjacent peaks in the second axial section (21) and that the first and second axial sections of circumferentially-oriented roughness are adapted in use to provide the same or substantially the same pitch.
An implant as claimed in any one of the preceding claims, characterised in that the pitch is a predetermined distance, that the ratio of the predetermined distance to the axial spacing between the crests of adjacent peaks in the first axial section is a first multiple integer, that the ratio of the predetermined distance to the axial spacing between the crests of adjacent peaks in the second axial section is a second multiple integer and that the first multiple integer is greater than the second multiple integer.
An implant as claimed in any one of the preceding claims, characterised in that the crests of all of the peaks, or substantially all of the peaks, in the first and second axial sections lie on an axial plane parallel to the main axis of the shaft.
An implant as claimed in any one of the preceding claims, characterised in that the height (h1, h2) of the peaks, as measured from the troughs to the crests, in the first axial section differs from that in the second axial section.
An implant as claimed in any one of the preceding claims, characterised in that the height of the peaks, as measured from the troughs to the crests, in the first axial section is no greater than 0.20 mm.
An implant as claimed in any one of the preceding claims, characterised in that the height of the peaks, as measured from the troughs to the crests, in the second axial section is in the range 0.15-1 mm.
An implant as claimed in any one of the preceding claims, characterised in that the circumferentially-oriented roughness in at least one of the first and second axial sections is presented by a screw thread profile with the circumferentially-oriented peaks being defined by thread elements of the screw thread profile.
An implant as claimed in any one of the preceding claims, characterised in that the implant is a dental implant adapted for implantation in the maxilla or mandible of an edentulous patient for supporting a superstructure which presents one or more artificial teeth.
A method of implanting an implant into a bone tissue structure comprising the steps of providing an implant (10) as claimed in any one of the preceding claims, providing a bore-hole in the bone tissue structure and screwing the implant into the bore-hole so that the shaft is embedded in the bone tissue.
An implant (10) substantially as hereinbefore described with reference to and illustrated by the accompanying Figures of drawings.
A method of implanting an implant into a bone tissue structure substantially as hereinbefore described with reference to and illustrated by the accompanying Figures of drawings.
Dependencies are inferred from the claim text.