Surgical instrument comprising a lockable battery housing

What is this patent about?

’033 is related to the field of surgical stapling and cutting instruments, specifically focusing on the power management and safety systems of battery-operated handheld devices. In modern surgical environments, ensuring that a powered instrument is in a reliable state before use and remains powered during critical maneuvers is essential for patient safety. The background context involves the transition from manual to motor-driven firing systems, which necessitates robust mechanisms to manage the physical and electrical interface between a removable power source and the instrument handle.

The underlying idea behind ’033 is the implementation of a physical safety barrier that is electronically controlled by the instrument’s internal diagnostics to manage the battery’s seating status. Rather than relying solely on software alerts, the invention uses a mechanical lockout to physically block a battery from connecting if the device is compromised, and a mechanical lock to prevent accidental power loss during active firing. This creates a hardware-level enforcement of safety protocols, ensuring the tool cannot be used if it is at the end of its life or in a faulty state, and cannot be unplugged while it is mid-stroke.

The claims of ’033 focus on a handle assembly equipped with a battery cavity, electrical contacts, and a diagnostic system that controls a deployable battery lockout. The independent claims cover two primary safety states: a lockout configuration that prevents a battery from reaching an operably seated position if the handle is deemed unsuitable for operation, and a locking configuration that traps the battery in place while the instrument is actively transmitting motion to the shaft. This dual-purpose mechanism ensures that the electrical connection is either strictly prohibited or strictly maintained based on the device's operational status.

In practice, the system utilizes an electromagnetic actuator, such as a solenoid, to deploy cantilevered lock arms from the internal walls of the battery cavity. When the diagnostic system detects a fault or an end-of-life condition, the armature moves these arms into the path of the battery, physically obstructing the receptacle. Conversely, during a firing sequence, the same or a similar mechanism shifts the arms behind shoulders on the battery housing, effectively pinning the power pack against the contacts to prevent a sudden loss of power that could leave the instrument jammed in tissue.

This approach differs from prior solutions that relied on simple latches or software-only disables, which could be bypassed or ignored by a user. By integrating the firing member's position or a dedicated solenoid with a physical obstruction, the invention provides a fail-safe that renders the handle physically incompatible with a power source once it is no longer safe to use. Furthermore, by using the internal firing member to trip these mechanisms or act as a block itself, the invention achieves a high degree of mechanical integration that ensures the device's physical state always matches its diagnostic health.