Guoan Li

20120109299, May 3, 2012

Oct 26, 2011

13/281557

Guoan Li - Milton MA, US
Hemanth R. Gadikota - Boston MA, US
Thomas J. Gill - Weston MA, US

A61F 2/08

623 1314

Systems and methods for ligament reconstruction provides an implant configured to position ligaments in the anatomic positions to thereby to restore the native anatomy and function of the reconstructed area. The implant includes a sheath, a first ledge, a second ledge, a first anchor and a second anchor. The sheath has an exterior surface and an interior surface, wherein the interior surface of the sheath forms a lumen configured to receive a sheath expander. The first ledge and the second are configured to separate the ligaments and acts as an anchor for the sheath in the bone tunnel. The first anchor and the second anchor are configured to engage the ligaments and be expandable outwards away from the lumen to provide fixation in a bone tunnel. When the implant receives the sheath expander, the ligaments can be separated, positioned, and secured in the bone tunnel.

20120310362, Dec 6, 2012

Jun 7, 2012

13/491126

Guoan Li - Milton MA, US
Harry E. Rubash - Weston MA, US
Kartik Mangudi Varadarajan - Cambridge MA, US

The General Hospital Corporation D/B/A Massachusetts General Hospital - Boston MA

A61F 2/38

623 2032

Embodiments of the invention provide knee prostheses which more faithfully and closely replicate the function, anatomy and physiology of the normal human knee yielding a number of advantages. Among other things, such prostheses can provide an increased range of motion and function more normally particularly in extension, deep flexion and during normal gait. Knee prostheses according to various aspects of the invention recognize that during movement of the knee, particularly during flexion, the kinematics of the bones of the knee are a result of achieving equilibrium of the forces that cause motion of the knee. In addition, the shape of the articular surfaces acting in combination with forces imposed by various muscles, ligaments and tendons, determines the direction of the large contact forces.

20130018477, Jan 17, 2013

Jul 12, 2012

13/547383

Orhun K. Muratoglu - Cambridge MA, US
Kartik Mangudi Varadarajan - Belmont MA, US
Guoan Li - Milton MA, US
Harry E. Rubash - Weston MA, US
Thomas Zumbrunn - Somerville MA, US

The General Hospital Corporation D/B/A Massachusetts General Hospital - Boston MA

A61F 2/38

623 2028

Methods and devices are provided for knee joint replacement with anterior cruciate ligament (ACL) substitution. Generally, the methods and devices can allow a knee joint to be partially or totally replaced in conjunction with substitution of the knee joint's ACL. In one embodiment, a knee replacement prosthesis can include a medial or lateral femoral implant, a femoral intercondylar notch structure, a medial or lateral tibial insert, and an ACL-substitution member. The ACL-substitution member can be configured to engage with the femoral intercondylar notch structure during a full range of knee motion and/or during only early knee flexion.

20130297032, Nov 7, 2013

May 3, 2013

13/886512

Guoan Li - Milton MA, US
Kartik Mangudi Varadarajan - Belmont MA, US
Harry E. Rubash - Weston MA, US

A61F 2/38

623 2035

The present invention provides a femoral prosthesis for a femur which can enable or allow deep knee flexion without creating excessive tension in the ligamentous structure of the knee. The femoral prosthesis includes an internal non-articulating surface, an external articulating surface, a medial condyle and a lateral condyle. The height of the medial condyle is less than the height of the lateral condyle. A proximal-posterior tip of the medial condyle is rounded and is shifted inwards relative to the native level of the proximal-posterior region of the femur bone to facilitate knee flexion. A method of mounting a femoral prosthesis on a femur is also described.

20110196490, Aug 11, 2011

Oct 13, 2009

13/122845

Hemanth R. Gadikota - Boston MA, US
Thomas J. Gill - Boston MA, US
Guoan Li - Boston MA, US

A61F 2/08

623 1314

Anterior cruciate ligament reconstruction methods and devices are designed to achieve an anatomically accurate double bundle anterior cruciate ligament reconstruction by using a single femoral and tibial tunnel. The method and devices reconstruct the two bundles of the anterior cruciate ligament in a single femoral and tibial tunnel using a bone-patellar tendon-bone graft. The methods and devices enable an accurate anatomical reconstruction of the anteromedial and posterolateral bundles by creating a single femoral and tibial tunnel as opposed to creating two tunnels in the tibia and femur.

20190358043, Nov 28, 2019

Jan 3, 2018

16/477118

Guoan Li - Milton MA, US
Jianguo Li - Nanchang, Jiangxi, CN

A61F 2/36
A61F 2/34
A61L 27/04
A61L 27/34

An artificial hip joint with a composite ball head includes an artificial acetabulum () and a composite ball head (); wherein an internal surface of the artificial acetabulum () cooperates with an external surface of the composite ball head (), and the composite ball head () can rotate within the artificial acetabulum (); the internal surface of the artificial acetabulum () is directly in contact with the composite ball head () without a liner therebetween; the composite ball head () comprises a metal ball head () and a non-metallic shell () wrapped around an external surface of the metal ball head (). For the composite ball head (), the metal ball head () is wrapped with a non-metallic shell (), which has large supporting force capability, has strong bearing capacity, effectively reduces the contact stress of the non-metallic shell (), is stable and reliable.

20170273799, Sep 28, 2017

Jun 9, 2017

15/618536

- Boston MA, US
Kartik Mangudi Varadarajan - Belmont MA, US
Guoan Li - Milton MA, US
Harry E. Rubash - Weston MA, US
Thomas Zumbrunn - Somerville MA, US

A61F 2/38
A61F 2/08
A61F 2/30

Methods and devices are provided for knee joint replacement with anterior cruciate ligament (ACL) substitution. Generally, the methods and devices can allow a knee joint to be partially or totally replaced in conjunction with substitution of the knee joint's ACL. In one embodiment, a knee replacement prosthesis can include a medial or lateral femoral implant, a femoral intercondylar notch structure, a medial or lateral tibial insert, and an ACL-substitution member. The ACL-substitution member can be configured to engage with the femoral intercondylar notch structure during a full range of knee motion and/or during only early knee flexion.

20160008124, Jan 14, 2016

Apr 20, 2015

14/690851

- Boston MA, US
Thomas J. Gill - Boston MA, US
Guoan Li - Milton MA, US

A61F 2/08
A61B 17/04
A61B 17/68

Anterior cruciate ligament reconstruction methods and devices are designed to achieve an anatomically accurate double bundle anterior cruciate ligament reconstruction by using a single femoral and tibial tunnel. The method and devices reconstruct the two bundles of the anterior cruciate ligament in a single femoral and tibial tunnel using a bone-patellar tendon-bone graft. The methods and devices enable an accurate anatomical reconstruction of the anteromedial and posterolateral bundles by creating a single femoral and tibial tunnel as opposed to creating two tunnels in the tibia and femur.