Hybrid straight cup impactor
View Patent ↗An orthopedic impactor device for positioning an orthopedic prosthetic cup implant during a hip replacement surgery is described. The impactor comprises a distal prosthetic cup engagement portion which is separated from a proximal strike plate by an elongated housing and handle. The housing has a length that extends from a proximal housing portion to a distal housing end with an intermediate housing section therebetween. The intermediate housing section comprises spaced right and left side walls that extend upwardly from a bottom wall to an upper opening. A drive train, comprising a connection rod connectable to an orthopedic prosthetic cup, at least partially resides within the elongated housing. The drive train comprises a linkage sub-assembly that transfers rotational movement of a shaft located at the drive shaft proximal end to the connection rod.
1. An orthopedic impactor, comprising:
a) an elongated housing extending along a longitudinal axis A-A from a housing proximal section to a housing distal end, wherein a prosthetic cup engagement portion is located at the housing distal end;
b) a handle connected to and extending proximally from the housing proximal section;
c) a drive train at least partially disposed with the housing and within the housing, the drive train extending from a drive train proximal end to a drive train distal end, the drive train comprising a connection rod that extends along longitudinal axis A-A from a connection rod proximal end to a connection rod distal portion having a ram distal end at the drive train distal end, wherein the ram distal end is detachably connectable to an orthopedic prosthetic cup;
d) a kick plate, wherein the kick plate extends outwardly from an exterior surface of the housing proximal section, wherein the kick plate comprises a kick plate surface that faces the impactor distal end; and
e) wherein rotation of the connection rod at the drive train proximal end causes a connected orthopedic prosthetic cup to travel in an axial direction along longitudinal axis A-A.
2. The orthopedic impactor of claim 1 , wherein the drive train comprises a linkage sub-assembly that connects the connection rod proximal end to a shaft having opposed distal and proximal shaft ends, the shaft distal end connected to the connection rod proximal end at the drive train proximal end, wherein the linkage sub-assembly transfers rotational movement of the shaft to the connection rod.
3. The orthopedic impactor of claim 2 , wherein the linkage sub-assembly comprises a pivot block that is connected between opposed first and second U-joints.
4. The orthopedic impactor of claim 2 , wherein the shaft is oriented at an angle α that is measured between an imaginary axis B-B that extends along a length of the shaft and the longitudinal axis A-A.
5. The orthopedic impactor of claim 4 , wherein the angle α ranges from about 20° to about 60°.
6. The orthopedic impactor of claim 2 , wherein a knob is connected to the shaft proximal end.
7. The orthopedic impactor of claim 1 , wherein a strike plate is located at the handle proximal end.
8. The orthopedic impactor of claim 1 , wherein a channel having a generally U-shaped cross-section oriented perpendicular to the longitudinal axis A-A is formed within and extends along a length of the housing intermediate section.
9. The orthopedic impactor of claim 1 , wherein a groove having a generally U-shaped cross-section is oriented perpendicular to the longitudinal axis A-A and extends lengthwise along longitudinal axis A-A through the housing distal end, wherein the groove is dimensioned to receive at least a portion of the connection rod distal portion.
10. The orthopedic impactor of claim 9 , wherein the connection rod distal portion comprises a shaft region that extends between a frustum portion positioned proximal of the ram distal end, wherein the shaft region is received within the groove that extends through the housing distal end.
11. The orthopedic impactor of claim 1 , wherein the connection rod distal portion comprises a frustum portion having a base surface that faces the rod distal end.
12. The orthopedic impactor of claim 1 , wherein the ram distal end is threaded, the ram distal end dimensioned to be received within an aperture of an orthopedic prosthetic cup.
13. The orthopedic impactor of claim 1 , wherein the housing intermediate section comprises spaced apart right and left side walls extending upwardly from a bottom wall to an upper opening.
14. The orthopedic impactor of claim 1 , wherein the prosthetic cup engagement portion comprises an orthopedic cup nose having a frusto-conical shape, wherein the orthopedic cup nose is connected to the housing distal end.
15. The orthopedic impactor of claim 14 , wherein the orthopedic cup nose comprises a plurality of spaced apart ribs that extend outwardly from an exterior surface of the orthopedic cup nose.
16. The orthopedic impactor of claim 14 , wherein a retainer ring is positioned between the housing distal end and the orthopedic cup nose.