CN-114587724-B - Fixation device for an orthopaedic prosthesis, heat treatment device for an orthopaedic prosthesis and method of use

Abstract

The present invention relates generally to devices and methods for securely joining modular orthopaedic prosthesis components together by securing together recesses and protrusions of a modular orthopaedic prosthesis component, and in particular, securing protrusions present in a modular component into correspondingly configured recesses (i.e., holes or grooves) present in other modular components thereof. Preferably, the protrusions are tapered and the holes or recesses, respectively, are configured to provide a tight tolerance fit therewith. In a preferred embodiment, a securing means is used to engage the component, the securing means comprising a heat resistant portion or region shielding the heated portion from its surroundings, the securing means being usable to hold the orthopaedic prosthesis component. In further preferred embodiments, the invention further comprises a heat treatment device used to provide an appropriate heat treatment to the modular orthopaedic prosthesis component (or portion thereof). Methods of using the fixation device and the heat treatment device during modular orthopedic prosthesis surgical implantation are also disclosed.

Inventors

• Zafir Temanini

Assignees

• 联合创新技术有限责任公司
• 联合创新技术有限责任公司

Dates

Publication Date

20260421

Application Date

20170811

Priority Date

20170811

Claims (10)

1. 1. A heat treatment device adapted to apply thermal expansion to a portion or component of a modular orthopedic prosthesis having a tapered cavity, the heat treatment device comprising: A heater core having a convex conical configuration, the heater core being slidably inserted into the conical cavity and the heater core being slightly undersized relative to the size of the conical cavity to avoid binding between a portion or component of the modular orthopedic prosthesis and the heater core, and The heating core is heated by a heating element, the heating element is an electromagnetic unit, a resistive heater, an electric heating coil or a thermistor, wherein the electromagnetic unit comprises a primary electromagnetic coil and a secondary electromagnetic coil; The electromagnetic unit, resistive heater, electrical heating coil, or thermistor is used to heat a portion or component of the modular orthopedic prosthesis to apply thermal expansion to the portion or component of the modular orthopedic prosthesis.
2. 2. The heat treatment apparatus of claim 1, wherein the heating element generates heat in a range of 93 ℃ to 260 ℃.
3. 3. The heat treatment apparatus of claim 2, wherein the heating element generates heat in the range of 120 ℃ to 205 ℃.
4. 4. The thermal processing device of claim 1, further comprising a housing.
5. 5. The heat treatment apparatus of claim 4, further comprising a chamber for containing a gas or vacuum.
6. 6. The heat treatment apparatus according to claim 5, wherein the chamber is capable of being pressurized over 1atm.
7. 7. The thermal processing device of claim 1, which is a hand-holdable thermal processing device.
8. 8. The thermal processing device of claim 7, further comprising a hand-held grip.
9. 9. A heat treatment apparatus according to any one of claims 1 to 8, further comprising one or more audiovisual auxiliary devices.
10. 10. The heat treatment apparatus according to any one of claims 1 to 8, wherein the convex taper is a morse taper.

Description

Fixation device for an orthopaedic prosthesis, heat treatment device for an orthopaedic prosthesis and method of use The present invention relates generally to devices and methods for securely joining components of a modular orthopaedic prosthesis together by securing together a recess (FEMALE PARTS) and a protrusion (MALE PARTS) of the components of the modular orthopaedic prosthesis, particularly by securing a protrusion (male part) present in a modular component into a correspondingly configured recess (FEMALE PART) (i.e., hole or groove) present in another modular component thereof. Preferably, the male portion is tapered and the female portion is a hole or groove correspondingly configured to provide a tight tolerance fit with the male portion. In a preferred embodiment, a securing device is used to join the components, the securing device comprising a heat resistant portion or region that shields the heated portion or component from its surroundings, the securing device being usable to hold the components of the orthopaedic prosthesis. In a further preferred embodiment, the invention further comprises a heat treatment device which is used to provide a suitable heat treatment to the component (or part thereof) of the modular orthopaedic prosthesis. Methods of utilizing the fixation device and the heat treatment device during surgical implantation of the modular orthopedic prosthesis are also disclosed. The present invention thus relates to a device and a method for assembling an orthopaedic prosthesis from a plurality of components, in particular for use in connection with a prosthesis implanted in the human body, for at least partially replacing a shoulder, elbow, hip or knee joint via a surgical procedure. Such orthopedic prostheses are typically assembled from two or more component parts, such as an implantable stem that is fixed to bone and an implantable correspondingly sized cup-shaped structure (cup) that is also implanted or fixed to bone. The two components themselves (or in combination with additional components) may operate as a replacement joint for the treated patient. Examples of such orthopaedic prostheses comprising tapered portions are well known and include inter alia "Interlocking REVERSE HIP Prosthesis (interlocking anti-hip prosthesis)" of US 8313531 B2, "Modified Reverse Joint and Revision Prosthesis (modified reverse joint and revision prosthesis)" of US 2014/0156011 A1, "Lined Femoral Cup (lining femoral cup)" of US 2014/0200675 A1. These depict a multi-part implantable orthopaedic prosthesis that includes a tapered portion (i.e., a Morse taper). From these, it is readily seen that certain components and portions of implantable orthopedic prostheses are typically constructed of durable materials (i.e., metals and/or metal alloys (hereinafter collectively referred to as "metals")) that are biocompatible and are expected to have a long useful life. Such components of implantable orthopedic prostheses are typically formed or machined to very precise dimensions and tolerances. In some embodiments, the surface areas or portions of the component formed from the metal/metal alloy may also have a specific surface treatment, which may aid in one or more ways, such as reducing corrosion or improving bone growth on the surface of such portions. Modular orthopedic prostheses typically include components having "male" portions (or elements) that are sized to be inserted into correspondingly sized cavity or bore portions ("female" portions or elements) of additional components. In the operating room, the surgeon is typically provided with a number of discrete components (which may be in the form of a "kit") in which the surgeon can choose among the discrete components available during the surgical procedure. These components may vary in their respective sizes or configurations, for example, depending on their function, and from these components, the surgeon may assemble an appropriately configured orthopedic implant to be implanted in the patient. However, when multiple components are provided for assembly by a surgeon, such "modularization" often involves subsequent release of metal swarf within the patient's body, which occurs over a period of weeks, months or years after implantation of the orthopedic implant from the assembled modular components. Such metal swarf may be responsible for local inflammatory reactions, ultimately leading to osteolysis. The resulting pain and dysfunction often require subsequent and sometimes extensive surgical revision of the previously implanted orthopaedic prosthesis formed from the assembled modular components and/or significant clinical and functional limitations imposed on the patient. It is also known in the art that micro-movement between conical protrusions and correspondingly sized recesses under in vivo as well as in vitro conditions is a major culprit due to "fretting corrosion", although the two parts are typically machined metal parts manufacture