Packaging for a Size Varying Series of Femoral Stem Components for Artificial Hip Joints
The present disclosure is concerned with packaging which can accommodate a series of femoral stem components for prosthetic hip joints which have a dimension which varies minimally across the series but which vary considerably in overall size. The packaging is designed to minimize the travel of any member of the series packaged therein such that all the packaged components in the series can pass the standard handling and shipping tests typically used by the manufacturers of medical implants. The packaging comprises two thermoformed tray components which each carry three types of cavities which are interconnected. The tray components are designed to be assembled with their cavities facing each other. The cavities are designed to contain the lower stem, body and angled shaft of the stem component, respectively. The cavities for the lower stem and the body cooperate to capture the minimally varying dimension of the series.
1 . A two piece package thermoformed from a rigid thermoplastic material for the transport and handling of any one of a series of femoral stem components of different sizes for a prosthetic hip joint comprising two facing generally rectangular tray components, with each tray component having
a. at least one channel which faces an essentially identical channel in the other tray, said channels having;
i. a longer hemi-tubular section generally parallel to the long edge of its tray component;
ii. a shorter hemi-tubular section at an acute angle to said long edge; and
iii. a transition section connecting said longer and shorter hemi-tubular sections which provides a cavity of significantly greater width parallel to the short edge of its tray than said longer and shorter hemi-tubular sections and with a wall in alignment with the longitudinal wall of said longer hemi-tubular section closer to the periphery of said tray; and
b. means which allows it to be reversibly locked to said other tray component in a face to face configuration such that said longer and shorter hemi-tubular sections form a longer and shorter tubular section,
wherein said channels and said transition section cooperate to establish a clearance which closely approximates a dimension of the largest member of said series of femoral stem components of different sizes.
2 . The two piece package of claim 1 wherein each of said tray components has a hinge located approximately at the juncture of said longer hemi-tubular section and said transition section which runs parallel to the short edge of said tray component and runs the width of said tray component, thus allowing the portion of said tray component containing said transition section and said shorter hemi-tubular section to rotate out of the plane of said tray component.
3 . The two piece package of claim 3 wherein said rotatable portion of each of said tray components carries reversible locking means which functions independently of the locking means which holds the portion of each of said tray components carrying said longer hemi-tubular section to each other.
4 . The two piece package of claim 1 wherein both of said tray components is fabricated from a laminated thermoplastic such that the surf, aces which are adapted to face the femoral components to be packaged are an aromatic polyether polyurethane.
5 . The two piece package of claim 4 wherein said aromatic polyether polyurethane is melt laminated to another thermoplastic resin.
6 . The two piece package of claim 5 wherein said other thermoplastic resin is polyethylene terephthalate glycol.