End effector force measurement with digital drive circuit
A surgical device includes a handle assembly having a controller and an adapter assembly including a tubular housing having a proximal end portion configured to couple to the handle assembly and a distal end portion. The adapter assembly also includes a load sensing assembly disposed with the tubular housing. The load sensing assembly is configured to measure a load exerted on the tubular housing and includes: a sensor body having a pocket defined therein; a load sensor circuit disposed within the pocket and coupled to the sensor body; and a signal processing circuit disposed within the pocket and electrically coupled to the load sensor circuit. The load sensing assembly further includes a cover disposed over the pocket and enclosing the load sensor circuit and the signal processing circuit therein, the cover being coupled to the sensor body thereby forming a first hermetic seal therebetween. The surgical device further includes a surgical end effector configured to couple to the distal end portion of the adapter assembly.
1. A load sensing assembly comprising:
a sensor body including a pocket defined therein;
a load sensor circuit disposed within the pocket and coupled to the sensor body;
a signal processing circuit disposed within the pocket and electrically coupled to the load sensor circuit; and
a cover disposed over the pocket and hermetically enclosing the load sensor circuit and the signal processing circuit therein.
2. The load sensing assembly according to claim 1 further comprising:
a header including a contact coupled to the load sensor circuit and the signal processing circuit, wherein the header is coupled to the sensor body thereby forming a hermetic seal therebetween.
3. The load sensing assembly according to claim 1 , wherein the sensor body further includes a slot defined therein, the slot being connected to the pocket.
4. The load sensing assembly according to claim 1 , wherein the load sensing assembly includes a strain gauge.
5. The load sensing assembly according to claim 1 , wherein the signal processing circuit includes a flexible circuit board.
6. The load sensing assembly according to claim 5 , wherein the signal processing circuit is covered by a dielectric wrap.
7. An adapter assembly comprising:
a tubular housing having a proximal end portion and a distal end portion;
an actuation assembly; and
a load sensing assembly disposed with the tubular housing, the load sensing assembly configured to measure a load exerted on the tubular housing, the load sensing assembly including:
a sensor body including a pocket defined therein;
a load sensor circuit disposed within the pocket and coupled to the sensor body;
a signal processing circuit disposed within the pocket and electrically coupled to the load sensor circuit; and
a cover disposed over the pocket and hermetically enclosing the load sensor circuit and the signal processing circuit therein.
8. The adapter assembly according to claim 7 , wherein the load sensing assembly includes a strain gauge.
9. The adapter assembly according to claim 7 , wherein the signal processing circuit includes a flexible circuit board.
10. The adapter assembly according to claim 7 , wherein the sensor body includes a lumen defined therethrough and the actuation assembly is movable through the lumen.
11. The adapter assembly according to claim 7 , wherein the sensor body further includes a slot defined therein, the slot being connected to the pocket.
12. The adapter assembly according to claim 11 , wherein the load sensing assembly further includes a header including a contact coupled to the load sensor circuit and the signal processing circuit and the header is coupled to the sensor body thereby forming a hermetic seal therebetween.
13. The adapter assembly according to claim 12 , further comprising:
an electrically conductive lead coupled to the contact; and
an electrical connector disposed at the proximal end portion and coupled to the electrically conductive lead.
14. A surgical device including:
a handle assembly including a controller;
an adapter assembly including:
a tubular housing having a proximal end portion configured to couple to the handle assembly and a distal end portion;
a load sensing assembly disposed with the tubular housing, the load sensing assembly configured to measure a load exerted on the tubular housing, the load sensing assembly including:
a sensor body including a pocket defined therein;
a load sensor circuit disposed within the pocket and coupled to the sensor body;
a signal processing circuit disposed within the pocket and electrically coupled to the load sensor circuit; and
a cover disposed over the pocket and hermetically enclosing the load sensor circuit and the signal processing circuit therein; and
a surgical end effector configured to couple to the distal end portion of the adapter assembly.
15. The surgical device according to claim 14 , wherein the load sensing assembly includes a strain gauge.
16. The surgical device according to claim 14 , wherein the signal processing circuit includes a flexible circuit board.
17. The surgical device according to claim 14 , wherein the adapter assembly further includes an actuation assembly including a trocar member and wherein the sensor body includes a lumen defined therethrough and the actuation assembly is movable through the lumen.
18. The surgical device according to claim 14 , wherein the sensor body further includes a slot defined therein, the slot being connected to the pocket.
19. The surgical device according to claim 18 , wherein the load sensing assembly further includes a header coupled to the sensor body thereby forming a hermetic seal therebetween, the header having a contact coupled to the load sensor circuit and the signal processing circuit.
20. The surgical device according to claim 19 , wherein the adapter assembly further includes:
an electrically conductive lead coupled to the contact; and
an electrical connector disposed at the proximal end portion and coupled to the electrically conductive lead.
21. The surgical device according to claim 20 , wherein the handle assembly includes an electrical receptacle configured to couple to the electrical connector and the controller is coupled to the electrical receptacle.