Dental Handpiece with Reliable Electrical Signal Transmission

This patent introduces innovative solutions addressing critical challenges in dental technology. The invention combines advanced engineering principles with practical design considerations to deliver meaningful improvements in functionality, reliability, and user experience.

The Problem

Endodontic handpiece systems used for root canal treatment require reliable electrical signal transmission for functions like root canal length measurement, precise drilling, and advanced procedural features. Traditional slip ring designs have struggled with inconsistent electrical contact, which can compromise measurement accuracy and device functionality. Maintaining consistent signal integrity while enabling tool insertion and rotation presents significant engineering challenges.

The inability to address these challenges has limited innovation in the field and created inefficiencies that impact the broader industry. Current solutions often involve complex workarounds or compromise on performance, reliability, or user experience. This creates opportunities for transformative innovations that could reshape how these fundamental challenges are addressed.

What This Invention Does

This invention introduces an innovative dental handpiece design featuring an electrically conductive tool receiver combined with a slip ring assembly. The slip ring is positioned around the tool receiver and incorporates a prestressed bifurcated contact mechanism that maintains constant electrical contact with the tool receiver. This design ensures reliable signal transmission from external interface components to any tool inserted in the receiver during handpiece operation. The architecture keeps the entire signal path and drive chain electrically isolated from the outer casing using ceramic or plastic ball bearings, preventing unwanted electrical interference.

The comprehensive architecture ensures that all system components work in concert to deliver superior performance compared to existing solutions. The integrated approach addresses not only the primary technical challenge but also considers manufacturing efficiency, user experience, and long-term reliability across diverse operating conditions.

Key Features

• Electrically Conductive Tool Receiver. Enables direct electrical contact with inserted tools while maintaining structural integrity and rotation capability.
• Slip Ring with Prestressed Bifurcated Contact. Maintains consistent mechanical and electrical connection through spring-loaded contact points that adapt to tool variations.
• Electrical Isolation via Ball Bearings. Non-conductive ball bearings isolate the signal path and drive chain from the outer casing, preventing interference and improving signal quality.
• Integrated Drive Chain and Signal Path. Combines both mechanical drive and electrical signal transmission in a single, compact assembly for efficient operation.

Who Is Behind It?

The patent is led by Dentsply Sirona Inc., a recognized innovator headquartered in US. The invention brings together expertise from inventors Ertugrul, Metin; Lauerer, Julian; Oezel, Mahmut; Manderscheid, Mortiz; Hahl, Philipp. Patent attorney representation includes PHILLIPS ORMONDE FITZPATRICK.

The application was filed on 27 August 2025 with priority date 29 August 2024 in US, establishing precedent in the patent record for these technical innovations.

Why It Matters

Reliable electrical signal transmission is critical for endodontic procedures where precise measurements and tool control directly impact patient outcomes in root canal therapy. This innovation addresses the long-standing challenge of maintaining stable electrical contact in rotating dental handpieces, enabling more accurate root canal length measurements and improved procedural reliability. The prestressed contact design eliminates the inconsistency problems of traditional slip rings, making it particularly valuable for high-precision endodontic applications.

This innovation represents a significant step forward in solving long-standing technical challenges, with implications extending beyond immediate applications. The patent reflects substantial research and development investment and demonstrates the commitment to advancing the field through systematic innovation and engineering excellence.

Related Concepts

Endodontics is the dental specialty concerned with the diagnosis and treatment of the dental pulp, most commonly through root canal treatment. Modern endodontic handpieces combine rotary mechanical action with electronic apex-location signals, demanding both precise torque control and reliable electrical transmission.

A slip ring is an electromechanical device that allows the transmission of electrical signals from a stationary to a rotating component – a critical function in dental handpieces where continuous rotation must not interrupt measurement circuits used during endodontic therapy.

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AU 2025223755 was published in the Australian Official Journal of Patents on 19 March 2026 and is open for public inspection. Patent applications represent inventions that are sought to be protected and do not necessarily reflect commercially available products.