Acetabular cup impacting using patient-specific instrumentation

• US 10,350,022 B2
• Filed: 04/30/2015
• Issued: 07/16/2019
• Est. Priority Date: 04/30/2014
• Status: Active Grant

• Current Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Jansen, Herbert Andre, Li, Di, Duval, Karine, Falardeau, Bruno, Paradis, Francois, Pelletier, Benoit
• Primary Examiner(s): Gibson, Eric S
• Assistant Examiner(s): Shirsat, Marcela I
• Application Number:
  US14/700,882
• Publication Number:
  US 20150313723A1
• Time in Patent Office: 1,538 Days
• Field of Search: 606 91, 606 87, 606 99, 606102
• CPC Class Codes: A61B 2090/395 with marking agent for marking skin or other tissue
• CPC Class Codes: A61B 90/11 with guides for needles or instruments, e.g. arcuate slides or ball joints
• CPC Class Codes: A61B 90/13 guided by light, e.g. laser pointers
• CPC Class Codes: A61B 90/30 Devices for illuminating a surgical field, the devices having an interrelation with other surgical devices or with a surgical procedure
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2002/4681 by applying mechanical shocks, e.g. by hammering
• CPC Class Codes: A61F 2002/4687 Mechanical guides for implantation instruments
• CPC Class Codes: A61F 2002/4696 optical

Abstract

A cup impactor assembly comprises a shaft. A cup coupler is at a cup end of the shaft and is releasably connecting a cup in fixed relation. A handle is at an impacting end of the shaft. A visual guide is mounted to at least one of the shaft and the handle, the visual guide producing visual guidance for pointing at at least two landmarks of the pelvis or fixed relative to the pelvis, based on a pre-planned patient-specific relation between the at least two landmarks and a desired acetabular cup orientation relative to the landmarks. A method for orienting an acetabular cup prior to impacting in an acetabulum of a pelvis is also provided.

Claims

1. A method for orienting an acetabular cup prior to impacting in an acetabulum of a pelvis, comprising:

obtaining a cup impactor with a visual guide thereon at a location based on pre-operative planning specific to the patient, the visual guide emitting simultaneously at least two light beams;

releasably connecting an acetabular cup to an end of the cup impactor;

seating the cup at the end of the cup impactor in the acetabulum;

aligning the visual guide with at least two landmarks on the pelvis planned in the pre-operative planning specific to the patient by rotating the cup impactor with the cup seated in the acetabulum until a first of the light beams points a first of the landmarks on the pelvis, and a second of the light beams points a second of the landmarks on the pelvis separate from the first of the landmarks, the first and the second of the light beams being non-parallel to one another; and

when the visual guide is aligned, impacting the cup into the acetabulum with the cup impactor.

2. The method according to claim 1, wherein impacting the cup comprises translating the visual guide along the cup impactor to verify the impacting.

3. The method according to claim 1, further comprising, prior to seating the cup in the acetabulum:

obtaining a patient specific block adapted to be received in the acetabulum in a single possible orientation based on the pre-operative planning specific to the patient,

releasably connecting the patient specific block to the end of the cup impactor,

seating the patient block at the end of the cup impactor in the acetabulum, and

creating the at least two landmarks with the visual guide on the cup impactor.

4. The method according to claim 3, wherein creating the at least two landmarks with the visual guide comprises manually marking the at least two landmarks on the pelvis for subsequent use.

5. The method according to claim 4, wherein manually marking comprises at least one of securing stickers on and marking with ink the landmarks.

6. The method according to claim 1, further comprising, prior to seating the cup in the acetabulum:

obtaining a patient specific block adapted to be received in the acetabulum in a single possible orientation based on the pre-operative planning specific to the patient, and

creating the at least two landmarks with the patient specific block.

7. The method according to claim 6, wherein creating the at least two landmarks with patient specific block comprises positioning at least one pin with the patient specific block for subsequent use in aligning the visual guide.

8. The method according to claim 7, further comprising positioning two of said pin, and positioning a target board on the pins, wherein aligning the visual guide with at least two landmarks comprises aligning the visual guide with the at least two landmarks being on the target board.