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1. (WO2019002962) MODULAR POWERED ELECTRICAL CONNECTION FOR SURGICAL INSTRUMENT WITH FEATURES TO PREVENT ELECTRICAL DISCHARGE
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I/We claim:

1. An apparatus, comprising:

(a) a body assembly, wherein the body assembly comprises:

(i) a control circuit,

(ii) a battery pack operable to power the control circuit, and

(iii) a first electrical contact assembly, wherein the first electrical contact assembly is in communication with the control circuit;

(b) a modular shaft assembly configured to selectively couple with the body assembly, wherein the modular shaft assembly comprises a second electrical contact assembly, wherein the second electrical contact assembly is configured to operatively engage the first electrical contact assembly when the modular shaft assembly selectively couples with the body assembly; and

(c) a coupling detection assembly comprising:

(i) a detection activation member associated with the body assembly, wherein the detection activation member is in communication with the control circuit, and

(ii) a detection trigger member associated with the modular shaft assembly, wherein the detection trigger member is configured to activate the detection activation member such that the detection activation member communicates a first detection signal to the control circuit when the modular shaft assembly selectively couples with the body assembly;

wherein the control circuit is configured to verify operative engagement between the first electrical contact and the second electrical contact in response to the control circuit receiving the first detection signal, wherein the control circuit is configured to energize the first electrical contact in response to verifying operative engagement between the first electrical contact and the second electrical contact.

2. The apparatus of claim 1, wherein the detection activation member comprises a proximity target, wherein the detection trigger member comprises a proximity sensor configured to detect the proximity target when the modular shaft assembly is operatively engaged with body assembly.

3. The apparatus of claim 2, wherein the proximity target comprises a magnet, wherein the proximity sensor comprises a Hall effect sensor.

4. The apparatus of claim 1, wherein the detection activation member comprises a button and a switch, wherein the switch is in communication with the control circuit, wherein the button is configured actuate from a first position to a second position to activate the switch to selectively communicate the first detection signal to the control circuit when the modular shaft assembly is operatively engaged with the body assembly.

5. The apparatus of claim 4, wherein the button is resiliently biased to the first position.

6. The apparatus of claim 4, wherein the body assembly further comprises a frame, wherein the switch is fixed relative to the frame.

7. The apparatus of claim 6, wherein the button is slidably housed within the frame of the body assembly.

8. The apparatus of claim 1, wherein the modular shaft assembly comprises a circuit board, wherein the circuit board is in communication with the second electrical contact of the modular shaft assembly.

9. The apparatus of claim 8, wherein the control circuit is configured to briefly energize the first electrical contact to establish communication with the circuit board to verify operative engagement between the first electrical contact and the second electrical contact.

10. The apparatus of claim 8, wherein the control circuit is configured to measure an electrical impedance of an electrical circuit formed between the first electrical contact and the second electrical contact to verify operative engagement between the first electrical contact and the second electrical contact.

11. The apparatus of claim 8, wherein the control circuit is configured to measure an electrical resistance of an electrical circuit formed between the first electrical contact and the second electrical contact to verify operative engagement between the first electrical contact and the second electrical contact.

12. The apparatus of claim 11, wherein the second electrical contact comprise a short circuit connector configured to couple with the first electrical contact to force the resistance of the electrical circuit to be substantially zero ohms.

13. The apparatus of claim 1, wherein the body assembly further comprises an indicator in communication with the control circuit, wherein the control circuit is configured to activate the indicator if the control circuit does not verify operative engagement between the first electrical contact and the second electrical contact.

14. The apparatus of claim 1, wherein the module shaft assembly comprises an end effector.

15. The apparatus of claim 14, wherein the end effector comprises a lower jaw and an anvil.

16. The apparatus of claim 14, wherein the end effector comprises a circular stapling head assembly.

17. An apparatus, comprising:

(a) a body assembly, wherein the body assembly comprises:

(i) a control circuit, and

(ii) a first electrical contact assembly, wherein the first electrical contact assembly is in communication with the control circuit;

(b) a modular shaft assembly configured to selectively couple with the body assembly, wherein the modular shaft assembly comprises:

(i) a circuit board, and

(ii) a second electrical contact assembly in communication with the circuit board, wherein the second electrical contact assembly is configured to operatively engage the first electrical contact assembly when the modular shaft assembly is selectively coupled to the body assembly; and

(c) a coupling detection assembly comprising:

(i) a detection activation member associated with the body assembly, wherein the detection activation member is in communication with the control circuit, and

(ii) a detection trigger member associated with the modular shaft assembly, wherein the detection trigger member is configured to activate the detection activation member such that the detection activation member communicates a first detection signal to the control circuit when the modular shaft assembly selectively couples with the body assembly;

wherein the control circuit is configured to verify operative engagement between the control circuit and the circuit board in response to receiving the first detection signal,

wherein the control circuit is configured to energize the first electrical contact in response to verifying operative engagement between the control circuit and the circuit board.

18. The apparatus of claim 17, wherein the control circuit is configured to verify operative engagement between the control circuit and the circuit board via a passive monitoring step.

An apparatus, comprising:

(a) a body assembly, wherein the body assembly comprises:

(i) a control circuit, and

(ii) a first electrical contact assembly, wherein the control circuit is configured to fully activate the first electrical contact;

(b) a modular shaft assembly configured to selectively couple with the body assembly, wherein the modular shaft assembly comprises a second electrical contact assembly, wherein the second electrical contact assembly is configured to operatively engage the first electrical contact assembly when the modular shaft assembly selectively couples with the body assembly; and

(c) a coupling detection assembly comprising:

(i) a detection activation member associated with the body assembly, wherein the detection activation member is in communication with the control circuit, and

(ii) a detection trigger member associated with the modular shaft assembly, wherein the detection trigger member is configured to activate the detection activation member such that the detection activation member communicates a first detection signal to the control circuit when the modular shaft assembly selectively couples with the body assembly;

wherein the control circuit is configured to verify connection between the first electrical contact assembly and the second electrical contact assembly in response to the first detection signal prior to fully activating the first electrical contact assembly.

20. The apparatus of claim 19, wherein the modular shaft assembly defines a longitudinal axis, wherein the modular shaft assembly is configured to rotate about the longitudinal axis relative to the body assembly when the modular shaft assembly is selectively coupled with the body assembly.