Precision hip replacement method

• US 9,610,092 B2
• Filed: 03/27/2012
• Issued: 04/04/2017
• Est. Priority Date: 08/29/2011
• Status: Expired due to Fees

• Current Assignee: Crescent H. Trust
• Original Assignee: MicroPort Orthopedics Holdings, Inc. (MicroPort Scientific Corp.)
• Inventors: Penenberg, Brad L.
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): NELSON, CHRISTINE L
• Application Number:
  US13/431,944
• Publication Number:
  US 20130053856A1
• Time in Patent Office: 1,834 Days
• Field of Search: 606 91
• CPC Class Codes: A61B 17/164 intramedullary
• CPC Class Codes: A61B 17/1659 Surgical rasps, files, planes, or scrapers
• CPC Class Codes: A61B 17/1668 for the upper femur A61B17/164 takes precedence
• CPC Class Codes: A61B 17/1703 using imaging means, e.g. by X-rays
• CPC Class Codes: A61B 17/1746 for the acetabulum
• CPC Class Codes: A61B 17/175 for preparing the femur for hip prosthesis insertion
• CPC Class Codes: A61B 17/320016 Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes A61B10/0233, A61B17/29, A61B17/3207 take precedence
• CPC Class Codes: A61B 17/32093 for skin incisions
• CPC Class Codes: A61B 17/3494 with safety means for protection against accidental cutting or pricking, e.g. limiting insertion depth, pressure sensors for the peridural space A61B17/3401
• CPC Class Codes: A61B 2017/320044 Blunt dissectors blunt suture needles A61B2017/06085
• CPC Class Codes: A61B 2034/2048 using an accelerometer or inertia sensor
• CPC Class Codes: A61B 2090/067 for measuring angles
• CPC Class Codes: A61F 2/4609 of acetabular cups

Abstract

A method for accurately positioning the acetabular cup in a minimally invasive total hip arthroplasty (THA), comprising the steps of (a) placing the cup in roughly the correct position in the acetabulum using a acetabular component placement tool, (b) taking a first abduction reading and a first anteversion reading using a gyroscopic positioning unit aligned with the acetabular component placement tool, (c) taking an image of at least a portion of the cup using a radiography unit, (d) using the image to determine the actual orientation of the cup and required position of the cup to properly orient the acetabular component, (e) incrementally altering the position of the cup by using a striking tool, (f) taking new abduction and anteversion readings using the gyroscopic unit to determine the relative movement of the cup caused by the tapping, and (g) repeating any of the steps as necessary.

Claims

1. A method for locating the optimal position for a portal incision in a minimally invasive total hip arthroplasty, comprising the steps of:

making a main incision to access an acetabulum of a patient;

determining a trajectory generally perpendicular to a plane defined by a face of the acetabulum;

using a cutting member to cut a path through the patient'"'"'s tissue along the trajectory generally perpendicular to the plane defined by the face of the acetabulum to a point just under the patient'"'"'s skin thereby allowing a surgeon to avoid numerous blood vessels, muscles, tendons, and nerves, wherein the cutting member is inserted through the main incision and used to position the trajectory generally perpendicular to the plane defined by the face of the acetabulum; and

making a portal incision at the point to provide access to the acetabulum at a location that is along the trajectory perpendicular to the plane defined by the face of the acetabulum.

2. The method of claim 1 wherein the cutting member makes the portal incision from inside the patient'"'"'s skin.

3. The method of claim 1 comprising tenting the patient'"'"'s skin from the inside to locate a safe region with a circumference up to 2 inches in which to make the portal incision from the outside.

4. The method of claim 3 wherein the point is illuminated with a fiberoptic light.

5. The method of claim 1 wherein the point is illuminated with a fiberoptic light.

6. A method for locating the optimal position for a portal incision in a minimally invasive total hip arthroplasty, comprising the steps of:

making a main incision to access an acetabulum of a patient;

determining a trajectory generally perpendicular to a plane defined by a face of the acetabulum;

using a cutting member to cut a path through the patient'"'"'s tissue along the trajectory generally perpendicular to the plane defined by the face of the acetabulum to a point just under the patient'"'"'s skin thereby allowing a surgeon to avoid numerous blood vessels, muscles, tendons, and nerves, wherein the cutting member is inserted through the main incision after determining a trajectory generally perpendicular to the plane defined by the face of the acetabulum;

making a portal incision at the point to provide access to the acetabulum at a location that is along the trajectory perpendicular to the plane defined by the face of the acetabulum.

7. The method of claim 6 wherein the cutting member makes the portal incision from inside the patient'"'"'s skin.

8. The method of claim 6 comprising tenting the patient'"'"'s skin from the inside to locate a safe region with a circumference up to 2 inches in which to make the portal incision from the outside.

9. The method of claim 8 wherein the point is illuminated with a fiberoptic light.

10. The method of claim 6 wherein the point is illuminated with a fiberoptic light.