# US 2014/0156016 A1 · Bicruciate retaining tibial baseplate design and method of implantation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0156016 A1 - Document ID: US20140156016A1 - Status: Published application - Kind: A1 - Application number: 14/176,401 - Filed: 2014-02-10 - Published: 2014-06-05 - Earliest claimed: 2011-01-10 - Assignees: Howmedica Osteonics Corp. - Applicants: Howmedica Osteonics Corp. - Inventors: Carlos E. Collazo - Web page: https://patentgrep.com/patent/US20140156016A1 ## CPC - A61F 2/389: {Tibial components (A61F2/3868 takes precedence)} - A61B 17/157: {Cutting tibia} - A61B 17/1604: {Chisels; Rongeurs; Punches; Stamps} - A61F 2002/30131: {horseshoe- or crescent- or C-shaped or U-shaped} - A61F 2002/30688: {Means for allowing passage or sliding of tendons or ligaments} - A61F 2002/30892: {parallel} - 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) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A base component for a tibial implant has a lateral compartment and a medial compartment spaced from the lateral compartment defining an open central section therebetween. A connecting portion connects the medial and lateral compartments at an anterior end of the base component which anterior end is located adjacent the anterior tibia. The open central section of the base component intermediate the spaced medial and lateral compartments is open to a posterior end of the base component. The medial and lateral compartments have a bone contacting surface and a superiorly facing surface. The connecting portion has a curved anteriorly facing surface and has a first angled surface extending at an angle from adjacent the anterior end of the base component at a bone contacting surface of the connecting portion superiorly to a posterior end of the connecting portion. The first angled surface defining an anterior end of the open central section. ## Claims ### Claim 1 A tibial base component for a tibial implant comprising: a lateral compartment, a medial compartment spaced from the lateral compartment defining an open central section therebetween and a connecting portion connecting the medial and lateral compartments at an anterior end of the base component to be located adjacent the anterior tibia, wherein the open central section of the base component intermediate the spaced medial and lateral compartments is open to a posterior end of the base component, wherein the connecting portion, the medial and lateral compartments have a bone contacting surface and a superiorly facing surface, the connecting portion having a convexly curved anteriorly facing surface, the convexly curved anteriorly facing surface curved convexly in an anterior direction along an arc lying in a sagittal plane bisecting the open central section of the tibial implant along a proximal to distal extent of the tibial component, and has a first inferiorly facing planar angled surface extending at a first angle from adjacent the anterior end of the base component at a bone contacting surface of the connecting portion proximally and posteriorly to a posterior end of the connecting element, the first planar angled surface defining an anterior end of the open central section at the sagittal plane bisecting the open central section of the tibial implant. ### Claim 2 (depends on 1) The tibial base component set forth in claim 1 further comprising a second angled surface on the tibial component intermediate the medial and lateral tibial compartments extending from a posterior margin of the connecting portion at the bone contacting surface thereof laterally to a medially facing wall of the lateral compartment defining the open central section. ### Claim 3 (depends on 2) The base component as set forth in claim 2 wherein the curve of the anteriorly facing surface of the convexly curved anteriorly facing connecting portion has a radius of curvature centered in a sagittal plane located posteriorly of the connecting portion. ### Claim 4 (depends on 3) The base component as set forth in claim 3 wherein the connecting portion anteriorly facing surface is curved in a transverse plane. ### Claim 5 (depends on 1) The base component as set forth in claim 1 wherein the first angled surface is angled at 20° to 70° to the medial and lateral compartment bone contacting surfaces. ### Claim 6 (depends on 1) The base component as set forth in claim 1 wherein the open central section is defined by parallel medially and laterally facing walls of the lateral and medial compartments respectively. ### Claim 7 (depends on 6) The base component as set forth in claim 6 wherein the connecting portion first angled surface extends between the parallel medially and laterally facing walls. ### Claim 8 (depends on 6) The base component as set forth in claim 6 wherein a second angled surface extends at an angle from an anterior end of the first angled surface at the bone contacting surface laterally to the medially facing wall of the lateral compartment defining the open central section. ### Claim 9 (depends on 1) The base component as set forth in claim 1 wherein a superiorly facing surface of the connecting portion is planar. ### Claim 10 (depends on 1) The base component as set forth in claim 1 wherein a planar bone contacting surface surrounds the first angled surface. ### Claim 11 (depends on 9) The base component as set forth in claim 9 wherein the planar bone contacting surface extends laterally at the second angle from a lateral edge of the first angled surface to the medially facing wall of the lateral compartment. ### Claim 12 A base component for a tibial implant comprising: a medial compartment and a lateral compartment each having an anterior and posterior end, the medial compartment having a laterally facing side wall, the lateral compartment having a medially facing side wall spaced from the laterally facing side wall of the medial compartment to define an opening therebetween; a bridge connecting anterior end portion of the medial and lateral compartments, the bridge having an arcuate anteriorly facing surface and a first angled surface extending from adjacent a base the anteriorly facing surface superiorly towards a posterior end of the bridge, the bridge having a convexly curved anteriorly facing surface, the convexly curved anteriorly facing surface curved convexly in an anterior direction along an arc lying in a sagittal plane bisecting the open central section of the tibial implant along a proximal to distal extent of the tibial component, and has a first inferiorly facing planar angled surface extending at a first angle from adjacent the anterior end of the base component at a bone contacting surface of the connecting portion proximally and posteriorly to a posterior end of the connecting element, the first planar angled surface defining an anterior end of the open central section at the sagittal plane bisecting the open central section of the tibial implant. ### Claim 13 (depends on 12) The base component as set forth in claim 12 wherein the connecting portion is curved in a sagittal plane, the plane extending through the proximal tibia. ### Claim 14 (depends on 13) The base component as set forth in claim 13 wherein the curve of the anteriorly facing surface of the connecting portion has a radius of curvature centered in a sagittal plane posteriorly of the connecting portion. ### Claim 15 (depends on 14) The base component as set forth in claim 14 wherein the connecting portion anteriorly facing surface is curved in a transverse plane. ### Claim 16 (depends on 12) The base component as set forth in claim 12 wherein a second angled surface extends at an angle from an anterior end of the first angled surface at the bone contacting surface laterally to the medially facing wall of the lateral compartment defining the open central section. ### Claim 17 A tibial base component for a tibial implant comprising: a lateral compartment, a medial compartment spaced from the lateral compartment defining an open central section therebetween and a connecting portion connecting the medial and lateral compartments at an anterior end of the base component to be located adjacent the anterior tibia, wherein the open central section of the base component intermediate the spaced medial and lateral compartments is open to a posterior end of the base component, wherein the connecting portion, the medial and lateral compartments and the connecting portion have a bone contacting surface and a superiorly facing surface, the connecting portion having a convexly curved anteriorly facing surface, the convexly curved anteriorly facing surface curved convexly in an anterior direction along an arc lying in a sagittal plane bisecting the open central section of the tibial implant along a proximal to distal extent of the tibial component, and has a posteriorly and inferiorly facing tapered surface extending from adjacent the posterior-most superiorly facing surface of the connecting portion of the base component distally and anteriorly to an anterior end of the open central section at the bone contacting surface of the tibial base component, the distally and anteriorly tapered surface defining an anterior end of the open central section at the sagittal plane bisecting the open central section of the tibial implant. ### Claim 18 (depends on 17) The tibial base component set forth in claim 17 further comprising an angled surface on the tibial component intermediate the medial and lateral tibial compartments extending from a posterior margin of the connecting portion at the bone contacting surface thereof laterally to a medially facing wall of the lateral compartment defining the open central section. ### Claim 19 (depends on 17) The base component as set forth in claim 17 wherein the curve of the anteriorly facing surface of the convexly curved anteriorly facing connecting portion has a radius of curvature centered in a sagittal plane located posteriorly of the connecting portion. ### Claim 20 (depends on 19) The base component as set forth in claim 19 wherein the connecting portion anteriorly facing surface is curved in a transverse plane. ### Claim 21 (depends on 18) The base component as set forth in claim 18 wherein the angled surface extends at an angle from an anterior end of the tapered surface at the bone contacting surface laterally to the medially facing wall of the lateral compartment defining the open central section.