Penumbra has filed a patent for a system and method that automatically selects a frequency of a magnetic field in a magnetic tracking system. The system emits an alternating magnetic field using a set of three frequencies, and a processor selects the frequency set with the lowest energy. If the actual jitter exceeds the estimated jitter by a predetermined amount, the processor switches to a different set of frequencies. GlobalData’s report on Penumbra gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Penumbra, cardiothoracic surgery instruments was a key innovation area identified from patents. Penumbra's grant share as of September 2023 was 42%. Grant share is based on the ratio of number of grants to total number of patents.
Automatic selection of frequency in a magnetic tracking system
A recently filed patent (Publication Number: US20230296697A1) describes a system for determining the position and orientation of a receiver relative to a transmitter using magnetic fields. The system includes a transmitter with multiple source magnetic coils to generate a magnetic field and a receiver with multiple sensor magnetic coils to sense the magnetic field and generate magnetic sensor data. A processor is used to control the transmitter and receiver and perform various calculations.
The system operates by causing the transmitter to generate a magnetic field at a specific frequency and the receiver to sense the magnetic field at the same frequency. The processor then determines the expected amount of jitter (variation) in the magnetic field at that frequency and measures the actual jitter. If the actual jitter is determined to be excessive compared to the expected jitter, the system repeats the process at a different frequency until the excessive jitter is eliminated.
Once the excessive jitter is eliminated, the system provides an indication of the position and orientation of the receiver relative to the transmitter based on the magnetic sensor data and the frequency at which there is no excessive jitter. This allows for accurate positioning and orientation information to be obtained.
The patent also mentions that the magnetic field can be time multiplexed, meaning it is generated and sensed in a sequential manner. Additionally, each frequency used in the system has an associated amount of energy, with frequencies different from the initial frequency having higher energy levels.
The method described in the patent can be executed by processing circuitry in a computing device, and the instructions for the method can be stored on a non-transitory computer readable storage medium.
Overall, this patent describes a system and method for determining position and orientation using magnetic fields, with a focus on reducing jitter and improving accuracy.