Heating unit used in thermal securement of prosthetic components
An articular ball impactor having a heat resistant material used during “heat shrink fit” process for providing secure fixation of Morse taper components in modular orthopedic implants. The female Morse component of the articular ball is heated by electromagnetic unit providing thermal expansion. Subsequently, it is impacted over the male Morse taper component and then cooled by commonly used sterile irrigation fluid allowing the female Morse component to shrink thus providing considerable compression, fit and significant reduction of micromotion that has been so widely responsible of fretting and mechanical corrosion.
1. An electromagnetic heating unit configured to heat a part of an orthopedic implant component having a female taper comprising:
a primary coil and secondary coil wrapped around a common iron core which generates a high induction electrical output transmitted to a heating element situated in a heating chamber which heating element dissipates heat imparted to the female taper part of the orthopedic implant component.
2. The heating unit of claim 1 , wherein the heating element further comprises a heating core in the form of a male Morse taper.
3. The heating unit of claim 1 , wherein the heating element is electrically connected via a conducting cable to the secondary coil.
4. The heating unit of claim 1 , wherein the heating element generates heat within the range of between 150° and 300° Centigrade.
5. The heating unit of claim 1 , which further comprises:
a visual and/or an acoustic alarm which operate when high induction electrical output is turned off by a thermostat.
6. The heating unit of claim 1 , which further comprises a variable thermostat.
7. The heating unit of claim 1 , which further comprises:
a top extension in a form of a cylinder which extends the heating chamber.
8. The heating unit of claim 7 , wherein the top extension comprises a lid configured to seal the heating chamber, and a channel through which a vacuum may be established in the heating chamber.
9. The assembly of claim 7 , wherein the top extension comprises a lid configured to seal the heating chamber, and a channel through which an inert gas or rare gas may be introduced into the heating chamber.
10. The heating unit of claim 1 , wherein the heating element reaches a temperature between 240° F. and 400° F.
11. The heating unit of claim 1 , which further comprises a lid configured to seal the heating chamber.
12. The heating unit of claim 11 , wherein the sealed heating chamber may contain a vacuum or a rare gas.
13. The heating unit of claim 1 , wherein the orthopedic implant component is an articular ball.
14. The heating unit of claim 1 , wherein the orthopedic implant component is a femoral implant.