Implant having a metallic porous surface and method of making

Abstract: An implant comprises a plastic body (2) and a metallic, porous surface (3) securely fixed to the body. The implant is made by first producing a porous mold insert having a porous metal structure and a soluble filler material filling a portion of its pores. The mold insert is then placed in a mold and plastic is injected into the mold and the exposed pores of the insert to form the implant body and securely attach the body arid insert. The implant is then contacted by a solvent which dissolves the filler material to expose that portion of the insert which had been filled.

Description: BACKGROUND OF THE INVENTION The present invention relates to implants having a porous surface. More specifically it relates to implants having a porous surface wherein the implants are made by attaching the implant body to the porous surface by molding. Increasingly, attention is being focused on the use of non-metallic materials for constructing prosthetic orthopaedic implants. Materials such as thermoplastics, thermoplastic composites, ceramics, and others have been used to better match the flexural rigidity of bone and eliminate patient exposure to metal ions. These materials are often also advantageously shaped by economical molding processes such as injection molding or compression molding. As with implants constructed of other materials it is desirable to provide a porous surface on the implant surface to accommodate bone ingrowth or cement interdigitation. Typically the porous surface comprises a wire mesh or beaded or dimpled surface. United States Patents 4,978,355, 4,955,911, 4,813,960 and UK Patent Application GB 2 216 425 A teach providing a porous surface on a plastic implant by pressing a heated wire mesh into the plastic implant body. U.S. 4,955,911 and GB 2 216 425 A teach a permanent solid layer within the wire mesh to prevent the outer pores of the mesh from becoming filled with plastic. United States Patent 4,778,469 teaches forming a textured surface on a plastic implant by pressing a heated, textured plate into the implant surface and then dissolving the plate to leave behind the impression of the plate. Finally, U.S. 4,479,271 teaches molding a plastic implant to a wire mesh. SUMMARY OF THE INVENTION It is an object of the present invention to provide an implant that is suitable for high speed and reproducible manufacture. It is another object of the invention to provide an implant that can be simultaneously formed to final shape and attached to a porous surface. It is also an object of the invention to provide an implant possessing strong fixation between a porous surface and the implant body. It is another object of the invention to provide an implant that is inexpensive to manufacture. It is yet another object of the invention to provide an implant that can be readily manufactured by injection moulding. It is finally an object of the invention to provide a method for manufacturing an implant that is inexpensive, reproducible, and which produces strong fixation between a porous surface and the implant body. Accordingly the invention provides an implant comprising a body and a porous surface attached to the body characterised in that the body has been formed in a processing environment; the porous surface is a porous insert attached to a surface of the body; and in that the implant further comprises a filler material embedded in the porous material, the filler material being stable for a predetermined duration when exposed to she processing environment in which the body was formed. Briefly the invention provides an implant comprising a plastic body and a metallic, porous surface securely fixed to the body. The implant is made by first producing a porous mould insert having a porous metal structure and a soluble filler material filling a portion of its pores. The mould insert is then placed in a mould and plastic is injected into the mould to form the implant body. The implant is then contacted by a solvent which dissolves the filler material to expose that portion of the insert which had been filled. In a preferred embodiment the implant may include a metal core that is placed in the mould prior to moulding. BRIEF DESCRIPTION OF THE DRAWINGS The before mentioned objects and advantages and other objects and advantages of the present invention are apparent from the following detailed description and the drawings wherein: FIG. 1 is a perspective view of an exemplary bone implant according to the invention. FIG. 2 is a perspective view of an exemplary porous pad with its pores partially filled to form a mold insert. FIG. 3 is a detail view of the porous pad of FIG. 2. FIG. 4 is an exploded perspective view of an exemplary implant and mold. FIG. 5 is a perspective view of an exemplary bone implant according to the invention having a porous surface with a filler material embedded in the porous surface. DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, an exemplary prosthetic implant is depicted as a femoral hip stem. The hip stem 1 includes a body 2 and a porous surface 3. To produce the implant, a porous pad 9 is first formed from a suitable material by any of a variety of known methods. Preferably it includes metal fibers such as titanium and its alloys or cobalt chromium alloys. It could also be made of sintered metal beads, sintered ceramics, or other suitable porous material. Next, a porous mold insert 4, as shown in FIG. 2, is made by filling a portion of the porous pad with a filler material 5 as more clearly shown in FIG. 3. Preferably the filler material is an amorphous polymer such as polysulfone because of the processibility of amorphous polymers and their solubility in certain solvents. Other examples of suitable amorphous polymers include polyethersulfone, polycarbonate, polyetherimide, and polymethylmethacrylate. Certain water soluble polymers may also be used such as polyethyleneoyide. A preferred way of introducing the filler material into the porous material is to press the two materials together while heating the porous material near the glass transition temperature of the filler. The filler will advance into the porous material in a controllable manner. Because these amorphous polymers are very heat stable and exhibit a glass transition phase, they will not flow uncontrollably into the porous material but will instead extrude to the desired depth. For example, if a 0.4 mm [.016 inches] thick film of polysulfone is pressed fully into a pad that is fifty percent porous then it will penetrate to a depth of approximately 0.8 mm [.032 inches] with a high degree of repeatability. The filler may be incorporated into the porous material before or after the porous material is formed to its final shape. In the example, the porous material is cut to a desired shape, embedded with the filler to form an insert, then bent (if necessary) to its final form. The insert includes holes 10 to aid in positioning and securing it in a mold, such as by pins extending from the mold to engage the holes. The porous surface mold insert is then placed in an appropriate mold half 6 with some of the unfilled pores in communication with the mold cavity, as shown in FIG. 4. The opposing mold half is not shown. The body material is introduced into the mold under appropriate heat and pressure to form the implant body and to cause it to interdigitate with the insert. Various molding techniques may be used including injection molding, compression molding and casting. It is preferable, though, to use injection molding. The stable filler material prevents the body material from entering the filled pores of the insert but allows it to infiltrate the unprotected pores to establish secure fixation of the insert to the body. Preferably the body material is a semi-crystalline polymer such as polyetheretherketone. Semi-crystalline polymers are desirable due to their strength, processibility, and their being insoluble in common solvents. Other suitable semi-crystalline polymers include polyaryletherketone and polyphenylinesulfide. Advantageously carbon fiber or other strengthening agents may be included in the body material. FIG. 5 shows a formed implant as removed from the mold. Finally, the filler material is removed from the porous material. In the preferred example detailed above, a solvent such as methylene chloride, methylethylketone, or acetone, can dissolve the amorphous polymer filler without adversely affecting the semicrystalline polymer. While the foregoing has described an exemplary and preferred embodiment of the present invention, variations are possible. For example, the materials and methods could be used to produce an implant with a porous surface suitable for any portion of the body. In addition, other structures could be included in the mold prior to molding the body. Such structures include solid and composite cores, fixation pins, and hollow inserts. In the example, a metal core 8 is placed in the mold between two inserts. The core has a neck 11, a stem 12, and a button 13. The neck and button engage the mold to form seals and prevent the injected material from coating their surfaces. Furthermore, the porous pad insert may be attached to a substantially fully formed implant using the above described method wherein the insert is partially filled and a fluid material is introduced between the insert and the implant such that upon solidification of the fluid material the fluid material forms a surface of the body in which the insert is embedded and the filler may be removed. It will also be realized that the porous surface may advantageously cover substantially all of the body as in the example or it may cover only a small portion of the body as is appropriate for the specific application. Finally, other materials may be used for the body and the filler material as long as the filler material is incorporable into the porous material in some manner and the filler material is stable while subject to the processing environment within which the body is formed. The processing environment is determined by conditions such as temperature, pressure, chemical reactivity and mechanical forces. Also, the filler should be removable without adverse affect to the body. With injection and compression molding it is necessary that the filler material is stable at a temperature and pressure at which the body material is molded, for the time during which that temperature and pressure are maintained. With casting, for example as with epoxy or a dissolved material, the filler may be removed by the use of an appropriate solvent, by melting, or by other means. In any of these methods the filler material may be removed by mechanical means as well as by chemical or thermal means. It will be understood by those skilled in the art that the aforementioned modifications and numerous others may be made to the preferred embodiment without departing from the scope of the invention defined by the appended claims.

Claims: An implant comprising a body (2) and a porous surface (3) attached to the body (2) characterised in that the body (2) has been formed in a processing environment; the porous surface (3) is a porous insert (4) attached to a surface of the body; and in that the implant further comprises a filler material (5) embedded in the porous material, the filler material (5) being stable for a predetermined duration when exposed to the processing environment in which the body (2) was formed. An implant as claimed in claim 1 characterised in that the filler material (5) is removable from the porous insert (4) by means that will not adversely affect the mechanical properties of the body (2). An implant as claimed in claim 1 or claim 2 characterised in that the filler material (5) is more soluble in a solvent than is the body (2). An implant as claimed in any preceding claim characterised in that the implant body (2) includes plastic and the filler material (5) embedded in the porous material is plastic. An implant as claimed in any preceding claim characterised in that the body (2) is moulded from a material which is able to be injection moulded and the filler (5) is stable at a temperature and pressure at which the body material is injection mouldable. An implant as claimed in any preceding claim characterised in that the body (2) includes a semi-crystalline polymer and the filler material (5) includes an amorphous polymer. An implant as claimed in any preceding claim characterised in that the body (2) includes a polymer selected from the group consisting of polyaryletherketone, polyetheretherketone, and polyphenylinesulphide. An implant as claimed in any preceding claim characterised in that the filler material (5) includes a polymer selected from the group consisting of polysulphone, polyethersulphone, polycarbonate, and polymethylmethacrylate. An implant as claimed in any preceding claim characterised in that the porous material comprises a metal structure. An implant as claimed in claim 9 characterised in that the metal structure includes a metal selected from the group consisting of titanium, titanium alloys, and cobalt chromium steel. An implant as claimed in claim 9 characterised in that the metal structure includes an element selected form the group consisting of wire and sintered beads. A method for producing an implant having a body (2) and a porous surface (3) characterised in that the method comprises the steps of : positioning a porous insert (4) in a mould, the insert (4) having a portion of its pores filled with a filler material (5) and moulding the body (2) of the implant in the mould. A method as claimed in claim 12 characterised in that the method further comprises the step of removing the filler material (5) from the insert (4) after the body (2) of the implant is moulded. A method as claimed in claim 13 characterised in that the filler material (5) is removed in a manner selected from the group consisting of melting, dissolving, and mechanically dislodging. A method as claimed in claims 12 to 14 characterised in that the porous insert (4) is formed by introducing an amorphous polymer into some of the pores of a porous material followed by injecting a semi-crystalline polymer into the mould to form the implant body (2) and then dissolving the amorphous polymer in a solvent. A method as claimed in claim 15 characterised in that the amorphous polymer is selected from the group consisting of polysulphone, polyethersulphone, polycarbonate, and polymethylmethacrylate. A method as claimed in claims 15 to 16 characterised in that the semi-crystalline polymer is selected from the group consisting of polyetheretherketone, polyaryletherketone, and polyphenylinesulphide. A method as claimed in claims 15 to 17 characterised in that the solvent is selected from the group consisting of methylene chloride, methylethylketone, and acetone. A method as claimed in claims 12 to 18 characterised in that the porous material is heated while the filler material (5) is pressed into the porous material.

Inventors: DEVANATHAN THIRUMAL, DEVANATHAN, THIRUMAL
Applicants: SQUIBB BRISTOL MYERS CO, BRISTOL-MYERS SQUIBB COMPANY
Application year: 1993
Main classification: A61F2
IPC codes: A61F2, B29C45, B29C70, A61L27