Surgical Instrument Battery Pack Switching for Safe Pre-Discharge
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Solution Overview
Problem
Lithium batteries in surgical instruments face issues with power dissipation during storage, leading to potential hazards and insufficient power delivery when used, as the potential difference between the positive and negative electrodes can drop below the motor's working voltage limit, causing operational failures.
Innovation Solution
A battery pack with a discharging system that includes a switching member and a discharge element, allowing the battery to be initially non-conductive, then transitioning to a conductive state when connected to the surgical instrument, ensuring power is reduced to a safe threshold within a specified time, and safely discharged after use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the lithium battery is designed with excessive electric power to ensure sufficient storage validity period, then the storage stability is improved, but the battery cannot deliver adequate instantaneous current when the surgical instrument operates at thick tissues
Solution Approach 1:
The patent implements preliminary discharging action by providing a discharge circuit that is activated before the battery is fully installed in the surgical instrument. The discharge circuit includes a discharge switch and discharge resistor that can be activated in advance to reduce the battery's electric power to a safe threshold range, ensuring the battery is in an optimal state before actual use without affecting its ability to deliver instantaneous power when needed
2Reliability
If the discharge circuit is always conductive to safely discharge the battery after use, then the safety is improved, but the battery cannot provide high current when the surgical instrument is operated
Solution Approach 1:
The patent implements a dynamic discharge circuit that can switch between conductive and non-conductive states based on operational requirements. The discharge switch is controlled to close the discharge circuit only when the battery is removed from the surgical instrument or when discharging is required, while keeping it open during normal operation to ensure full power delivery capability. This dynamic switching mechanism maintains both safety and power delivery performance
3Loss of energy
If the battery is discharged through the discharge circuit during operation, then the power is reduced to safe threshold, but the motor working voltage drops below the lower limit causing operational failure
Solution Approach 1:
The patent implements preliminary discharging before full operational use by providing a discharge circuit that can be activated in advance to reduce the battery's electric power to a safe threshold range. This preliminary action ensures the battery starts in an optimal state without affecting its ability to deliver high instantaneous current during actual surgical operations, thus maintaining operational reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents the potential difference from dropping below the motor's working voltage limit, ensuring consistent operation and safe disposal of lithium batteries by controlled discharging.
Implementation Method 1
a discharge element and a switching member, operated to electrically connect the discharge element to the battery unit of the battery pack to form a discharge circuit
Data Source
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AI summary
The present disclosure relates to the technical field of medical instrument, and in particular to a surgical instrument and a battery pack for use with the surgical instrument. The surgical instrument, comprises a handle assembly, having a protruding portion; and a battery pack, detachably assembled on the handle assembly, operated by the protruding portion, and having at least one battery unit, wherein the battery pack comprises at least one discharging system comprising a discharge element, and a switching member, operated to electrically connect the discharge element to the battery unit of the battery pack to form a discharge circuit, and having an initial open state, in which the discharge circuit is non-conductive, an intermediate open state, in which the switching member cooperates with the protruding portion to make the discharge circuit non-conductive, and a closed state, in which the switching member is separated from the protruding portion to make the discharge circuit conducting. When the discharge circuit is in the closed state for conducting, the battery unit discharges under the action of the discharge circuit.