Instrument for Use in Minimally Invasive Surgery

• US 20100121335A1
• Filed: 01/22/2010
• Published: 05/13/2010
• Est. Priority Date: 03/05/2004
• Status: Active Grant

• Current Assignee: MicroPort Orthopedics Holdings, Inc. (MicroPort Scientific Corp.)
• Original Assignee: Wright Medical Technology Incorporated (Stryker Corporation)
• Inventors: Penenberg, Brad L., Timmerman, Irina, McKnett, Christopher R.
• Granted Patent: US 8,439,928 B2
• Time in Patent Office: Days
• US Class Current: 606/91
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/1666 for the acetabulum
• CPC Class Codes: A61B 17/1746 for the acetabulum
• CPC Class Codes: A61B 17/92 Impactors or extractors, e.g. for removing intramedullary devices insertion or extraction of artificial joints A61F2/4603
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2002/30233 Stepped cylinders, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2002/30364 Rotation about the common longitudinal axis
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30487 Circumferential cooperating grooves and beads on cooperating lateral surfaces of a mainly longitudinal connection
• CPC Class Codes: A61F 2002/3054 about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
• CPC Class Codes: A61F 2002/30617 Visible markings for adjusting, locating or measuring
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2002/4635 using minimally invasive surgery
• CPC Class Codes: A61F 2002/4681 by applying mechanical shocks, e.g. by hammering
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2250/0097 : Visible markings, e.g. indicia

Abstract

The invention is directed to an instrument for use in minimally invasive hip surgery. In particular, the instrument is useful for both alignment and insertion/impaction of an acetabular shell. Furthermore, the instrument is suitable for assuring the shell is impacted with the proper abduction and version in left or right hips.

Claims

1. An instrument for use in forming and using a portal incision in a hip arthroplasty procedure to implant an acetabular implant, comprising:

a main body, a handle on an upper end of said main body, said main body including a lengthwise straight portion extending to a lower end of said main body,

an angled sleeve member fixedly formed on said lower end of said main body, said angled sleeve member having a sleeve bore therethrough,

said handle positioned on said main body such that a position of said handle indicates that the main body is in a proper position,

an arm, said arm having a straight first arm portion and a straight second arm portion extending contiguously from said first arm portion, said first arm portion extending perpendicularly from said main body below said handle, said second arm portion downwardly angled from said first arm portion,

a guide ring fixedly formed on an end of said second arm portion, said guide ring having a guide bore therethrough, and said guide bore axially aligned with said sleeve bore of said angled sleeve member to thereby guide a trocar or an impactor through said guide bore and into alignment with said sleeve bore.

2. The instrument of claim 1, wherein when said handle is perpendicular or parallel to an edge of an operating room table, the instrument will impact an acetabular shell with a proper version.

3. The instrument of claim 1 wherein said handle is a rotatable handle, wherein when said rotatable handle is rotated to a first position, the instrument may be used with left hips and when said rotatable handle is rotated to a second position, the instrument may be used with right hips.

4. The instrument of claim 3, wherein rotation of said rotatable handle between said first and said second positions is accomplished by untightening a tightening member to thereby release said rotatable handle, re-positioning said rotatable handle to a different one of said first and said second positions, and re-tightening said tightening member to thereby secure said rotatable handle in said different one of said first and said second positions.

5. The instrument of claim 4, wherein when said handle is perpendicular or parallel to an edge of an operating room table, the instrument will impact an acetabular shell with a proper version.

6. The instrument of claim 4, wherein an attachment end of said first arm portion has a threaded member rotatably disposed therein and extending therefrom, and said main body has a threaded bore, said threaded bore configured to receive said threaded member of said first arm portion for use in attaching said arm to said main body.

7. The instrument of claim 6, wherein said attachment end of said first arm portion further includes a pair of guidance pins extending therefrom on opposing sides of said threaded member, and said main body has a pair of pin bores, said pin bores sized and positioned to receive said guidance pins for use in attaching said arm to said main body.

8. The instrument of claim 7, further comprising a thumb wheel on said threaded member of said first arm portion for use in threading said threaded member into said threaded bore.

9. The instrument of claim 8, wherein when said handle is perpendicular or parallel to an edge of an operating room table, the instrument will impact an acetabular shell with a proper version.

10. The instrument of claim 1, wherein said first arm portion of said arm is removably attached to said main body.

11. The instrument of claim 10, wherein said first portion of said arm is removably attached to said main body via a threaded connection.

12. The instrument of claim 1, wherein an attachment end of said first arm portion has a threaded member rotatably disposed therein and extending therefrom, and said main body has a threaded bore, said threaded bore configured to receive said threaded member of said first arm portion for use in attaching said arm to said main body.

13. The instrument of claim 12, wherein said attachment end of said first arm portion further includes a pair of guidance pins extending therefrom on opposing sides of said threaded member, and said main body has a pair of pin bores, said pin bores sized and positioned to receive said guidance pins for use in attaching said arm to said main body.

14. The instrument of claim 13, further comprising a thumb wheel on said threaded member of said first arm portion for use in threading said threaded member into said threaded bore.