# US 12,150,859 B2 · Dual mobility acetabular component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,150,859 B2 - Document ID: US12150859B2 - Status: Granted - Kind: B2 - Application number: 17/381,135 - Filed: 2021-07-20 - Published: 2022-01-20 - Granted: 2024-11-26 - Earliest claimed: 2020-07-20 - Assignees: Joint Development, LLC - Applicants: Joint Development, LLC - Inventors: Eric M. Dacus; Thomas Collier - Web page: https://patentgrep.com/patent/US12150859B2 ## CPC - A61F 2/34: Acetabular cups - A61F 2/3094: {Designing or manufacturing processes} - A61F 2/32: for the hip - A61F 2002/30451: {soldered or brazed or welded} - A61F 2002/3208: {Bipolar or multipolar joints, e.g. having a femoral head articulating within an intermediate acetabular shell whilst said shell articulates within the natural acetabular socket or within an artificial outer shell} - A61F 2310/00023: Titanium or titanium-based alloys, e.g. Ti-Ni alloys - A61F 2310/00077: Copper or Cu-based alloys - A61F 2310/00083: Zinc or Zn-based alloys - A61F 2310/00592: Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract The dual mobility acetabular component includes an acetabular cup and a liner that engage one another in a relatively static relationship by way of a Morse taper. The acetabular cup and the liner may be manufactured from a metal material (e.g., titanium) that decreases the energy differential therebetween, to limit or eliminate the galvanic cell phenomenon that forms between adjacent surfaces thereof as a result of body fluid therein that remains captured in small gaps or spaces due to capillarity. As such, the dual mobility acetabular component may experience reduced fretting compared to conventional hip joints known in the art. ## Claims ### Claim 1 A dual mobility acetabular component, comprising: an acetabular cup having an internal curved surface at least partially comprising a first material; and a liner having an external curved surface at least partially comprising a second material and engageable with the internal curved surface of the acetabular cup for locking engagement therewith, the internal curved surface of the acetabular cup being larger than the external curved surface of the liner thereby forming a capillarity gap in between when engaged, wherein the first material has an affinity for electrons comparable to that of the second material thereby inhibiting ionization of the first material relative to the second material across the capillarity gap. ### Claim 2 (depends on 1) The dual mobility acetabular component of claim 1, wherein the first material and the second material comprise a titanium material or a titanium alloy material. ### Claim 3 (depends on 1) The dual mobility acetabular component of claim 1, wherein the acetabular cup comprises a base material different than the first material, wherein the first material comprises a vapor deposited layer at least partially covering the internal curved surface. ### Claim 4 (depends on 1) The dual mobility acetabular component of claim 1, wherein the liner comprises a base material different than the second material, wherein the second material comprises a vapor deposited layer at least partially covering the external curved surface. ### Claim 5 (depends on 1) The dual mobility acetabular component of claim 1, wherein the first material and the second material each have a chemical composition eliminating an energy differential across the capillarity gap when positioned proximate one another. ### Claim 6 (depends on 1) The dual mobility acetabular component of claim 1, wherein the first material and the second material comprise a common metal material. ### Claim 7 (depends on 6) The dual mobility acetabular component of claim 6, wherein the common metal material comprises a titanium material or a titanium alloy material. ### Claim 8 (depends on 1) The dual mobility acetabular component of claim 1, wherein the first material and the second material comprise a non-magnetic material selected from the group consisting of brass, copper, zinc, and an aluminum alloy. ### Claim 9 (depends on 1) The dual mobility acetabular component of claim 1, wherein the first material and the second material comprise a an ionization inhibiting material. ### Claim 10 (depends on 1) The dual mobility acetabular component of claim 1, wherein the first material and the second material comprise different chemical compositions. ### Claim 11 (depends on 1) The dual mobility acetabular component of claim 1, wherein the liner engages the acetabular cup about a circumferential cold weld. ### Claim 12 (depends on 11) The dual mobility acetabular component of claim 11, wherein the capillarity gap comprises multiple capillarity gaps formed on each side of the circumferential cold weld. ### Claim 13 (depends on 1) The dual mobility acetabular component of claim 1, wherein the capillarity gap comprises a buffer between the first material and the second material. ### Claim 14 (depends on 1) The dual mobility acetabular component of claim 1, wherein the liner engages the acetabular cup by a Morse taper. ### Claim 15 A dual mobility acetabular component, comprising: an acetabular cup comprising a first material; and a liner comprising a second material and lockable relative to the acetabular cup in a manner forming a capillarity gap in between the first material and the second material, wherein the first material and the second material comprise titanium or a titanium alloy inhibiting ionization across the capillarity gap by way of equalizing an energy potential therebetween. ### Claim 16 (depends on 15) The dual mobility acetabular component of claim 15, wherein the acetabular cup comprises a base material different than the first material, wherein the first material comprises a vapor deposited layer at least partially covering an internal curved surface of the acetabular cup. ### Claim 17 (depends on 15) The dual mobility acetabular component of claim 15, wherein the liner comprises a base material different than the second material, wherein the second material comprises a vapor deposited layer at least partially covering an external curved surface of the liner. ### Claim 18 (depends on 15) The dual mobility acetabular component of claim 15, wherein the first material and the second material comprise a different material. ### Claim 19 (depends on 15) The dual mobility acetabular component of claim 15, wherein the liner engages the acetabular cup about a cold weld having multiple capillarity gaps formed on each side thereof. ### Claim 20 (depends on 15) The dual mobility acetabular component of claim 15, wherein the capillarity gap comprises a buffer between the first material and the second material. ### Claim 21 A dual mobility acetabular component, comprising: an acetabular cup having a base material different than a vapor deposited internal curved surface layer; and a liner having a base material different than a vapor deposited external curved surface layer that engages the vapor deposited internal curved surface layer in a manner forming a capillarity gap therebetween, the vapor deposited internal curved surface layer shielding the base material of the acetabular cup and the vapor deposited external curved surface layer shielding the base material of the liner to equalize an energy potential between the acetabular cup and the liner thereby reducing ion exchange across the capillarity gap. ### Claim 22 (depends on 21) The dual mobility acetabular component of claim 21, wherein the vapor deposited internal curved surface layer has an affinity for electrons comparable to that of the vapor deposited external curved surface layer. ### Claim 23 (depends on 21) The dual mobility acetabular component of claim 21, wherein the base material of the acetabular cup and the base material of the liner comprise titanium or a titanium alloy. ### Claim 24 (depends on 21) The dual mobility acetabular component of claim 21, wherein the base material of the acetabular cup and the base material of the liner have a greater affinity for electrons than the respective vapor deposited internal curved surface layer and the vapor deposited external curved surface layer. ### Claim 25 (depends on 21) The dual mobility acetabular component of claim 21, wherein the vapor deposited internal curved surface layer and the vapor deposited external curved surface layer each have a chemical composition eliminating an energy differential across the capillarity gap when positioned proximate one another. ### Claim 26 (depends on 21) The dual mobility acetabular component of claim 21, wherein the vapor deposited internal curved surface layer and the vapor deposited external curved surface layer comprise a non-magnetic material selected from the group consisting of brass, copper, zinc, and an aluminum alloy. ### Claim 27 (depends on 21) The dual mobility acetabular component of claim 21, wherein the liner engages the acetabular cup about a circumferential cold weld and the capillarity gap comprises multiple capillarity gaps formed on each side of the circumferential cold weld.