Electrosurgical pencil with improved controls

• US 7,503,917 B2
• Filed: 08/05/2005
• Issued: 03/17/2009
• Est. Priority Date: 11/20/2003
• Status: Active Grant

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Ehr, Chris J., Reschke, Arlen J., Sartor, Joe Don
• Primary Examiner(s): PEFFLEY, MICHAEL F
• Application Number:
  US11/198,473
• Publication Number:
  US 20060041257A1
• Time in Patent Office: 1,320 Days
• Field of Search: 606/34, 606/41, 606/42, 606 45- 52
• US Class Current: 606/45
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 2018/00928 by sending a signal to an external energy source
• CPC Class Codes: A61B 2018/00946 slidable

Abstract

An electrosurgical pencil is provided and includes an elongated housing having an electrocautery blade supported therein and extending distally from the housing. The electrocautery blade is connected to a source of electrosurgical energy. The pencil further includes a plurality of activation switches supported on the housing for activating electrocautery blade. Each activation switch is configured and adapted to selectively complete a control loop extending from the source of electrosurgical energy upon actuation thereof. In use, actuation of at least one of the plurality of activation switches produces a dividing with hemostatic effect at the electrocautery blade. The electrosurgical pencil further includes at least one voltage divider network supported on the housing. The at least one voltage divider network is electrically connected to the source of electrosurgical energy and controls the intensity of electrosurgical energy being delivered to the electrosurgical pencil.

Claims

1. An electrosurgical pencil, comprising:

an elongated housing;

an electrocautery blade supported within the housing and extending distally from the housing, the electrocautery blade being connected to a source of electrosurgical energy;

a plurality of activation switches supported on the housing, each activation switch being configured and adapted to selectively complete a control loop extending from the source of electrosurgical energy upon actuation thereof;

wherein actuation of at least one of the plurality of activation switches produces a dividing with hemostatic effect at the electrocautery blade; and

at least one voltage divider network supported on the housing, the at least one voltage divider network being electrically connected to the source of electrosurgical energy and controlling the intensity of electrosurgical energy being delivered to the electrosurgical pencil.

2. The electrosurgical pencil according to claim 1, wherein the dividing with hemostatic effect is transmitted in discrete packets of energy.

3. The electrosurgical pencil according to claim 2, wherein the energy packet has a substantially instantaneous amplification.

4. The electrosurgical pencil according to claim 3, wherein the energy packet has a substantially instantaneous degradation.

5. The electrosurgical pencil according to claim 1, wherein the housing defines an open distal end for selectively receiving a proximal end of the electrocautery blade therein, and wherein the open distal end of the housing has a non-circular inner profile.

6. The electrosurgical pencil according to claim 5, further comprising a collar operatively supporting the electrocautery blade, the collar having a shaped outer surface complementing the shaped inner profile of the distal open end of the housing.

7. The electrosurgical pencil according to claim 6, wherein the collar and the inner profile of the distal open end of the housing have complementary ovular, triangular, rectangular, hexagonal, toothed, multi-faceted profiles.

8. The electrosurgical pencil according to claim 7, further comprising a blade receptacle configured and adapted to selectively engage a proximal end of the electrocautery blade.

9. The electrosurgical pencil according to claim 1, further comprising a stabilizer operatively disposed within the housing for increasing retention forces acting on the proximal end of the electrocautery blade, the stabilizer defining a passage therein configured and adapted to selectively receive a proximal end of the electrocautery blade.

10. The electrosurgical pencil according to claim 9, wherein the stabilizer is fabricated from a compliant polymeric material.

11. The electrosurgical pencil according to claim 1, wherein the at least one voltage divider network being electrically connected to the source of electrosurgical energy for controlling the intensity of electrosurgical energy being delivered to the plurality of activation switches from the source of electrosurgical energy and for controlling the intensity of electrosurgical energy delivered to the plurality of activation switches returning from the electrocautery electrode, the at least one voltage divider network comprises at least one return control wire electrically inter-connecting the electrocautery electrode and the source of electrosurgical energy, the return control wire transmitting excess electrosurgical energy from the electrocautery electrode to the source of electrosurgical energy.

12. The electrosurgical pencil according to claim 11, wherein the voltage network divider includes a slide potentiometer operatively associated with the housing.

13. The electrosurgical pencil according to claim 12, wherein the plurality of activation switches define a first resistor network disposed within the housing, and wherein the slide potentiometer defines a second resistor network disposed within the housing.

14. The electrosurgical pencil according to claim 13, wherein the slide potentiometer simultaneously controls the intensity of electrosurgical energy delivered to the plurality of activation switches.

15. The electrosurgical pencil according to claim 14, wherein at least one activation switch is configured and adapted to control a waveform duty cycle to achieve a desired surgical intent.

16. The electrosurgical pencil according to claim 15, further including three mode activation switches supported on the housing.

17. The electrosurgical pencil according to claim 16, wherein each mode activation switch delivers a characteristic signal to the source of electrosurgical energy which in turn transmits a corresponding waveform duty cycle to the electrosurgical pencil.

18. The electrosurgical pencil according to claim 16, wherein a first activation switch delivers a first characteristic signal to the source of electrosurgical energy which in turn transmits a waveform duty cycle which produces a cutting effect, a second activation switch delivers a second characteristic signal to the source of electrosurgical energy which in turn transmits a waveform duty cycle which produces a dividing with hemostatic effect, and wherein a third activation switch delivers a third characteristic signal to the source of electrosurgical energy which in turn transmits a waveform duty cycle which produces a coagulating effect.

19. The electrosurgical pencil according to claim 18, wherein the voltage divider network is a potentiometer.

20. The electrosurgical pencil according to claim 19, further including a molded hand grip operatively supported on the housing.

21. The electrosurgical pencil according to claim 20, wherein the hand grip is shaped and dimensioned to reduce fatigue on the hand of the user.

22. The electrosurgical pencil according to claim 21, further comprising:

indicia provided on the housing indicating to a user the level of intensity of the energy being delivered to the electrocautery blade.

23. The electrosurgical pencil according to claim 22, wherein the indicia is located along a path of travel of the slide potentiometer.