Source: https://patents.google.com/patent/WO2005032429A1/en
Timestamp: 2018-12-14 10:37:44
Document Index: 272853170

Matched Legal Cases: ['application No. 60', 'art 20', 'art 20', 'art 20', 'art.\n19', 'art.\n21', 'art.\n22']

WO2005032429A1 - Implant bore insert - Google Patents
Implant bore insert Download PDF
WO2005032429A1
WO2005032429A1 PCT/US2004/032041 US2004032041W WO2005032429A1 WO 2005032429 A1 WO2005032429 A1 WO 2005032429A1 US 2004032041 W US2004032041 W US 2004032041W WO 2005032429 A1 WO2005032429 A1 WO 2005032429A1
PCT/US2004/032041
Serafin Louis A Jr
Burlingame Nicholas H
Implant bore insert (10) has an outer surface (16) that is, at least in part, substantially cylindrically aligned. The insert may be blind, thus forming a cup, or it may be open ended. Preferably, the insert is provided with a predetermined outer circumferential surface (17) that provides for a suitable interference fit with a corresponding bore hole (25) of an implant component part (20). When inserted into the bore hole, the insert preferably seats itself on a blind end (22) of the bore hole.
This claims benefit of U.S. provisional patent application No. 60/507,872 filed on October 1, 2003 A.D. For the U.S.A., this is claimed pursuant to 35 USC 119(e) and/or 363 or 365(c), and the specification of the '872 application is incorporated herein by reference in its entirety. BACKGROUND TO THE INVENTION
I. Field The present invention concerns an insert for an implant bore, and the implant with the bore insert. For example, a ceramic hip joint ball bore can have a metal bore insert.
II. Art Various orthopedic devices are known. Ceramic ball joints for the hip, for example, may contain a tapered bore hole into which a suitably tapered metal stem is inserted. A problem with this is that, should there be a slight mismatch of the trunnion of the stem with the ceramic bore, or a defect such as a burr on the trunnion the implant may fail, even at its assembly. In attempting to address this problem, Amino et al . , by U.S. patent No. 5,361,311, disclosed an artificial hip joint in which a tapered cone of a metallic stem is inserted into a tapered hole of a ceramic head, with a truncated conical sleeve compressingly held in the tapered hole of the head. It would be desirable to improve upon the art. DISCLOSURE OF THE INVENTION It has been found that a problem with the device of the '311 patent is that, although there may be hoop stress in the ceramic ball, it may significantly change with stem insertion. Also, the sleeve does not contact the blind end of the ball's tapered hole, and compressive load stress on the ball from the stem is absent. Such stress characteristics may lead to implant failure. Accordingly, it is an object to ameliorate the foregoing. It is another object of the present invention to provide a novel joint implant bore insert, and an implant with the insert. It is another object hereof to provide a novel hip joint implant ball insert, and a hip ball and a femoral component with the hip ball, which have the insert. At least one of these or other objects are satisfied, if not wholly, at least in part, by an implant bore insert that has an outer surface that is, at least in part, substantially cylindrically aligned. The insert may be blind, thus forming a cup, or it may be open ended. Preferably, the insert is provided with a predetermined outer circumferential surface that provides for a suitable interference fit with a corresponding bore hole of an implant component part. When inserted into the bore hole, the insert preferably seats itself on a blind end of the bore hole. The insert can also seat on a step located before the blind end of the bore hole. Significantly, by the invention, especially in its preferred embodiments, a stress-bearing ceramic implant component part having a bore hole into which a stem or other part is inserted can be generally protected from problems associated with the insertion of slightly mismatched or misaligned metal stems and so forth. A particularly notable benefit is the control of hoop stress and other radial stress that may be undesirable, and the provision of the compressive load stress through the blind end of the bore hole of the part. Numerous further advantages attend the invention. The drawings form part of the specification hereof. With respect to the drawings, which are not necessarily drawn to scale, the following is briefly noted: FIG. 1 is a perspective \plan view of an implant bore insert of the invention, inserted into a bore of a component part, and into which a stem is inserted, the same embodied as a ceramic ball hip joint implant with a metal cup insert and a metal stem. FIG. 2 is a side sectional view of the insert in FIG. 1. FIG. 3 is a side sectional plan view of another implant bore insert of the invention, inserted into the bore of a component part, embodied as a ceramic ball hip joint implant with an open-ended metal insert. FIG. 4 is a top plan view of another implant bore insert of the invention embodied for a hip. FIG. 5 is a side sectional plan view of the insert depicted in FIG. 4, taken along 5-5 of FIG. 4, inserted into the bore of a ceramic ball. FIG. 6 is a side sectional view of another implant bore insert of the invention, embodied as a ceramic ball hip joint implant metal cup insert, say, for a 28-mm conventional implant. The invention can be further understood by the detail set forth below, which may be read in view of the drawings. Such is to be taken in an illustrative and not necessarily limiting sense. The insert of the invention can be employed with virtually any suitable component part having a corresponding bore hole for insertion of a stem or other component part. Thus included among implants with which the insert may be employed are load-bearing joint implants to include enarthrodial joint balls such as, for example, for the hip, which may be a conventional, smaller ball for total hip replacement or a larger ball for hemi or total hip replacement, sometimes referred to as a "resurfacing" hip, the shoulder, a digit, and so forth; ginglymous joint components such as those of the knee, elbow, or ankle. Beneficially, the implant component is for an articulating joint such as the hip, shoulder, digit, knee, elbow, ankle, and so on. Thus, for example, various femoral hip and humeral shoulder components can be improved, as well as can metacarpal or phalangeal finger and thumb components, femoral and tibial knee components, and so forth and the like. The implant component into which will be inserted the insert can be made of any suitable material. Preferably, the material is a suitable ceramic, which, in general, may include a boride, oxide, carbide, nitride and/or silicate, say, of Al , Si, Sc, Y, La, a lanthanide series element, Ac, an actinide series element, Ti, Zr, Hf, V, Nb and/or Ta, and so forth and the like. However, the ceramic is especially a zirconia ceramic, and most especially a magnesium oxide stabilized zirconia ceramic. Such a ceramic may be made from a micropowder, or from a nanopowder where the powder precursors are less that about two hundred nanometers and the formed grain structure reflects this nanotechnolog . The insert may be made of any suitable material. A preferred material for the άnsert is a biocompatible metal or alloy. For instance, the biocompatible metal or alloy may be a cobalt metal alloy such as one conforming to ASTM-F-75, preferably ASTM-F-799 or ASTM-F-1537, or a titanium metal alloy such one conforming to ASTM-F-67, preferably ASTM-F-136 or ASTM-F-1472. The insert, although it has a body with an outer surface that is, at least in part, substantially cylindrically aligned, may take any of numerous forms. It has an inner surface that can receive a stem or other component part, and this inner surface can be tapered, cylindrical, ovoid, polygonal, threaded, and so forth. Preferably, the inner surface is tapered conically or especially truncated conically, for "example, with a Morse or Browne and Sharpe taper, to receive the corresponding stem or other part, which itself is preferably of biocompatible metal. With respect to the drawings, metal insert 10 includes side wall 11 and may include roof 12 orthogonal to standard long axis 12A, with blind end 12B and cup end 12C. The insert 10 may complete a circumferential circuit (FIGS. 1-3, 6) or have gap 13 (FIGS. 4, 5). Inner surface 14 has Morse taper. Receiving hole 15 can receive a femoral stem. Outer surface 16 is at least in part a cylinder, and has outer circumference providing for a suitable interference fit with a corresponding bore hole of an implant component part. The outer surface 16 may be subdivided into proximal section 17 and distal section 18, with the proximal sectipn 17 having the predetermined outer circumferential surface that provides for the interference .fit, for example, as can be provided by scratched surface 19 for a 0.001-inch interference fit with a corresponding machined bore hole. The proximal section 17 may be threaded, grooved or otherwise roughened to aid insertion and/or gripping. Implant component part 20 is depicted as a ceramic hip ball, which has end 22 orthogonal to cylindrical wall 24, which define bore hole 25, which can be considered to have opening portion 28. When inserted into the bore hole 25, the insert 10 seats on the blind end 22 of the bore hole 25 (FIGS. 1, 3, 5), to include with the cup end 12C (FIG. 1) . The distal section 18 advantageously does not contact the opening portion 28 of the bore hole 25, preferably for a distance of about from ten to fifty percent of the overall depth of the bore hole 25, i.e., about from ten to fifty percent of the distance along the wall 24 from the outer opening to the end 22 of the bore hole 25 (FIGS. 3, 5) which can improve stress related characteristics of the system. The insert 10 can extend beyond the opening of the bore hole 25, which can allow extended neck or stem 30 lengths, preferably up to the depth of the bore hole 25, and can allow an outer shelf or shoulder that is larger than the diameter of the bore hole 25 to allow the insert 10 to rest on a truncation adjacent the bore hole opening 28 (FIGS. 3, 5) . The 10 insert may be shrunk fit, for example, by cooling it before insertion into the part 20 and allowing it to warm up to ambient temperature thus causing expansion of the insert 10 to press against the wall 24 of the bore 25, or it may be secured by active metal brazing, as known in the art. Larger diameter proximal section 17 with smaller diameter distal section 18 generally limits stress more central to the part 20 as a ball and avoids stress about the opening 28 of the bore 25. The metal stem 30 has proximal end 32 on trunnion 35 with Morse taper, which fits into the receiving hole 15 of the insert 10. When inserted into the receiving hole 15, the end 32 of the trunnion 35 may seat on the blind end 12B of the insert 10 (FIG. 1) or seats on end 22 of the bore hole 25 (FIGS. 3, 5). Dimensions can be any which are suitable. In further reference to the drawings, examples of dimensions, which may be considered to be approximate, and further features can include those set forth in the tables which follow.
TABLE 1: Some comments and dimensions for FIGS. 3 and 5
Figure (s) Number Comment/Dimension 3, 5 50 Gage height, 2.70 mm (FIG. 5) 5 51 Overall height, 25.5 mm + 0.15 mm 52 Insert height, 20.0 mm + 0.15 mm 53 Laser mark (indicia) on chamfer, centered, letter height 1-2 mm 54 First angle, 50+2 degrees 55 Second angle, 30+2 degrees 56 Radius, 0.5 mm 57 Diameter, 28.00 mm + 0.00 mm - 0.05 mm; sphere, 0.005 mm; radius, 0.02 urn
TABLE 2: Some comments and dimensions for FIG. 6 for insert made, for example, of Ti 6-4 (ASTM F-136 or ASTM F-1472)
Number Comment/Dimension 60 Gage height, where trunnion engages, diameter 0.5005 inches + 0.0010 inches (1.271 cm + 0.0025 cm) 61 Taper, 5.72 + 0.07 - 0.04 degrees 62 Outside distal rim diameter, 0.677 inches (1.72 cm) 63 Basic height, 0.500 inches (1.27 cm) 64 Proximal height, 0.265 inches (0.673 cm) 65 Outside proximal section diameter, 0.6880 + 0.0001 inches (1.748 + 0.0003 cm), say, for 0.686-inch (1.74-cm) bore 66 Chamfer or radius, e.g., 0.020-inch (0.051-cm) radius 67 End thickness, 0.120 inch (0.305 cm)
The present invention is thus provided. yarious features, parts, subcombinations and combinations can be employed with or without reference to other features, parts, subcombinations or combinations in the practice of the invention, and numerous modifications can be effected within its spirit, the literal claim scope of which is particularly pointed out as follows:
What is claimed is: 1. An implant bore insert that has an outer surface that is, at least in part, substantially cylindrically aligned.
2. The insert of claim 1, which is blind.
4. The insert of claim 1, which is made of metal or alloy.
5. The insert of claim 1, which has a distal section that is less in dimension that that of a proximal section.
6. The insert of claim 1, which has a proximal section that is threaded, grooved or otherwise roughened.
7. The insert of claim 1, which has a shoulder that extends outwardly from a distal section thereof.
8. In combination, the insert of claim 1 and an implant component part into a bore hole of which the insert is inserted.
9. The combination of claim 8, wherein the insert is provided with a predetermined outer circumferential surface that provides for a suitable interference fit with the bore hole.
10. The combination of claim 9, wherein said part is ceramic and the insert seats itself on a blind end of the bore hole.
11. The combination of claim 8, also having an inserted stem.
12. The combination of claim 8, wherein said part is a ceramic ball for a hip joint implant.
13. The combination of claim 9, wherein said part is a ceramic ball for a hip joint implant.
14. The combination of claim 10, wherein said part is a ball for a hip joint implant.
15. The combination of claim 11, wherein said part is a ceramic ball for a hip joint implant.
16. The combination of claim 8, wherein the insert has a distal section that is less in dimension that that of a proximal section.
17. The combination of claim 8, wherein the insert has a proximal section that is threaded, grooved or otherwise roughened.
18. The combination of claim 8, wherein the insert extends beyond an opening of the bor,e hole of said part.
19. The combination of claim 18, wherein the insert has a shoulder that extends outwardly from a distal section thereof.
20. The combination of claim 19, wherein the shoulder rests on an outer truncated surface of said part.
21. The combination of claim 8, wherein the insert is shrunk fit into said part.
22. The combination of claim 21, wherein the insert is active metal brazed into said part.
PCT/US2004/032041 2003-10-01 2004-09-30 Implant bore insert WO2005032429A1 (en)
US50787203 true 2003-10-01 2003-10-01
US60/507,872 2003-10-01
US67724105 true 2005-05-03 2005-05-03
US11391823 US7892289B2 (en) 2003-10-01 2006-03-29 Implant bore insert
US11391823 Continuation-In-Part US7892289B2 (en) 2003-10-01 2006-03-29 Implant bore insert
WO2005032429A1 true true WO2005032429A1 (en) 2005-04-14
ID=36956103
PCT/US2004/032041 WO2005032429A1 (en) 2003-10-01 2004-09-30 Implant bore insert
US (1) US7892289B2 (en)
WO (1) WO2005032429A1 (en)
DE102015016893B3 (en) 2015-12-29 2017-07-13 Milija Mitrovic orthopedic implant
US20060188845A1 (en) 2006-08-24 application
US7892289B2 (en) 2011-02-22 grant
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