Automated device for liposuction

• US 5,352,194 A
• Filed: 06/29/1992
• Issued: 10/04/1994
• Est. Priority Date: 06/29/1992
• Status: Expired due to Fees

• Current Assignee: University Of Pittsburgh (University of Pittsburgh of The Commonwealth System of Higher Education)
• Original Assignee: University Of Pittsburgh (University of Pittsburgh of The Commonwealth System of Higher Education)
• Inventors: Freidman, Mark B., Futrell, J. William, Greco, Richard J.
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): SCHMIDT, JEFFREY
• Application Number:
  US07/905,726
• Time in Patent Office: 827 Days
• Field of Search: 128/632, 128/752, 128/758, 128/766, 604/22, 604/27, 604/31, 604/35, 604/43, 604/65, 604/95, 604/102, 604/119, 604/121, 604/156, 604/157, 604/158-165, 604/174, 604/152, 604/902
• US Class Current: 604/35
• CPC Class Codes: A61B 2018/00196 reciprocating lengthwise
• CPC Class Codes: A61M 1/84 Drainage tubes; Aspiration tips for negative pressure wound therapy A61M1/90; for surgical cutting instruments A61B17/32
• CPC Class Codes: A61M 1/89 Suction aspects of liposuction surgical cutting instruments A61B17/32
• CPC Class Codes: A61M 2202/0014 removed from the body
• CPC Class Codes: A61M 2202/08 Lipoids
• CPC Class Codes: A61M 2205/106 reciprocating
• CPC Class Codes: Y10S 604/902 Suction wands

Abstract

The present invention provides a device for performing suction lipectomy or liposuction in which the reciprocal motion required during the liposuction procedure is automated. This automation greatly reduces the physical exertion required of the operating surgeon. The present invention also allows the use of smaller cannulae to achieve an improved aesthetic result. Use of such smaller cannulae with the manual liposuction procedures currently in use would be extremely taxing if not impossible.

Claims

1. An automated device for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm.;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion; and

(d) a control means in operative connection with said powered means for maintaining active control over the reciprocal, rectilinear motion produced by the powered means, said control means comprising means for providing a control signal to said powered means responsive to input from the group consisting of a predetermined waveform and feedback from operation of said cannula, said control means being operable to control the reciprocal, rectilinear motion in a desired manner via the control signal provided to said powered means.

2. A device according to claim 1 further comprising means for controlling the stroke length of the cannula.

3. A device according to claim 2 wherein said means for controlling the stroke length comprises mechanical abutment means which are variable in position.

4. A device according to claim 2 wherein said means for controlling the stroke length comprises switch means appropriately located to control the stroke length.

5. A device according to claim 4 wherein said switch means are variable in position.

6. A device according to claim 1 further comprising a means for sensing force exerted upon the cannula by said power means.

7. A device according to claim 6 further comprising a means for warning an operator when the force exerted upon the cannula exceeds a predetermined threshold value, said warning means being in operative connection with said means for sensing cannula force.

8. A device according to claim 6 further comprising a means for ceasing powered operation of said powered means when the force exerted upon the cannula exceeds a predetermined threshold value, said means for ceasing powered operation being in operative connection with said control means.

10. A device according to claim 1 further including a means for substantially counteracting reactionary force created by the motion of the cannula.

11. A device according to claim 1 wherein said control means further comprises a microprocessor.

12. A device according to claim 1 wherein said control means further comprises a servomechanism.

13. A device according to claim 1 wherein at least one electric motor is used as the powered means for producing the reciprocal, rectilinear motion.

14. A device according to claim 1 wherein at least one hydraulic actuator is used as the powered means for producing the reciprocal, rectilinear motion.

15. A device according to claim 1 wherein at least one pneumatic cylinder is used as the powered means for producing the reciprocal, rectilinear motion.

16. A device according to claim 15 wherein said pneumatic cylinder is a single-acting pneumatic cylinder.

17. A device according to claim 15 wherein said pneumatic cylinder is a double-acting pneumatic cylinder.

18. A device according to claim 15 further comprising means for controlling the stroke length of the cannula.

19. A device according to claim 18 wherein said means for controlling the stroke length comprises mechanical abutment means which are variable in position.

20. A device according to claim 18 wherein said means for controlling the stroke length comprises switch means appropriately located to control the stroke length.

21. A device according to claim 20 wherein said switch means are variable in position.

22. A device according to claim 15 further comprising a means for substantially restricting the tangential, rotational motion of the cannula.

23. A device according to claim 22 wherein said means for restricting the tangential, rotational motion of the cannula comprises pneumatic cylinder rod having a non-circular cross section.

24. A device according to claim 23 wherein said rod has a hexagonal cross section.

25. A device according to claim 22 wherein said means for restricting the tangential, rotational motion of the cannula comprises a guide means external to said pneumatic cylinder.

26. A device according to claim 15 wherein tangential, rotational motion of the cannula is restricted by attaching the cannula to more than one pneumatic cylinder.

27. A device according to claim 15 further including a means for substantially counteracting reactionary force created by the reciprocal, rectilinear motion.

28. A device according to claim 27 wherein said counteracting means comprises a least one slave cylinder operating in opposition to at least one pneumatic cylinder powering the reciprocal, rectilinear motion.

29. A device according to claim 15 further comprising a means for maintaining active control over the reciprocal, rectilinear motion produced by said at least one pneumatic cylinder.

30. A device according to claim 29 wherein said active control means comprises at least one servovalve.

31. A device according to claim 15 further comprising a means for maintaining active control over vacuum pressure supplied to the cannula.

32. A device according to claim 31 wherein said vacuum control means comprises a microprocessor.

33. The device of claim 15 further comprising a means of supplying a fluid to an area in the vicinity of an aperture of the cannula.

34. The device of claim 33 wherein said fluid comprises a component selected from the group consisting of lypolitic fluid and hemostatic fluid.

35. The device according to claim 15 further comprising a means for monitoring the constitution and flow rate of biological material removed during suction lipectomy, said monitoring means being in operative connection with said control means.

36. The device according to claim 35 wherein active control is maintained over said device according to data received from said monitoring means.

37. A device according to claim 1 further comprising a means for maintaining active control over vacuum pressure supplied to the cannula.

38. A device according to claim 37 wherein said vacuum control means comprises a microprocessor.

39. The device according to claim 37 further comprising a means for monitoring the constitution lipectomy, said monitor means being in operative connection and flow rate of biological material removed during suction lipectomy, said monitoring means being in operative connection with said control means.

40. The device according to claim 39 wherein active control is maintained over vacuum pressure according to data received from said monitoring means.

41. The device of claim 1 further comprising a means of supplying a fluid to an area in the vicinity of an aperture of the cannula.

42. The device of claim 41 wherein said fluid comprises a component selected from the group consisting of lypolitic fluid and hemostatic fluid.

43. The device according to claim 1 further comprising a means for monitoring the constitution and flow rate of biological material removed during suction lipectomy, said monitoring means being in operative connection with said control means.

44. The device according to claim 43 wherein active control is maintained over said device according to data received from said monitoring means.

45. A device according to claim 1 further comprising a handle means.

46. A device according to claim 45 wherein said handle means is in operative attachment with the cannula to substantially minimize the distance between an operator'"'"'s hand and a distal end of the cannula when the cannula is in a fully extended position.

9. A device according to claim further comprising a means for substantially restricting tangential, rotational motion of the cannula.

47. An automated device for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means including at least one pneumatic cylinder for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm.;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion;

(d) a control means in operative connection with said powered means for maintaining active control over the reciprocal, rectilinear motion produced by the powered means, said control means being operable to control the reciprocal, rectilinear motion in a desired manner via a control signal provided to said powered means; and

(e) a means for sensing cannula force, said sensing means comprising a means for measuring the pressure within said pneumatic cylinder, said pressure measuring means being in operative connection with said control means.

48. A device according to claim 47 wherein said pressure measuring means is a pressure transducer.

49. An automated device for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm., said powered means comprising at least one pneumatic cylinder;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion;

(d) a control means in operative connection with said pneumatic cylinder for maintaining active control over the reciprocal, rectilinear motion produced by the at least one pneumatic cylinder;

said control means comprising a microprocessor.

50. A device according to claim 49 further comprising at least one servovalve in operative connection with said microprocessor.

51. An automated device for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm.;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion; and

(d) a microprocessor for maintaining active control over the reciprocal, rectilinear motion produced by the powered means, said microprocessor controlling a servomechanism in a desired manner by providing a control signal to said servomechanism.

52. A automated device for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means including at least one pneumatic cylinder for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm.;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion;

(d) a control means in operative connection with said powered means for maintaining active control over the reciprocal, rectilinear motion produced by the powered means, said control means being operable to control the reciprocal, rectilinear motion in a desired manner via a control signal provided to said powered means; and

(e) switch means appropriately located for controlling the stroke length of the cannula, said switch means comprising magnetic reed switches disposed upon said pneumatic cylinder.

53. An automated device for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means including at least one pneumatic cylinder for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm.;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion;

(d) a control means in operative connection with said powered means for maintaining active control over the reciprocal, rectilinear motion produced by the powered means, said control means being operable to control the reciprocal, rectilinear motion in a desired manner via a control signal provided to said powered means; and

(e) a means for sensing cannula force, said sensing means being selected from the group consisting of cantilevered sensors, strain gauges and load cells, said sensing means being in operative connection with said control means.

54. An automated device for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means including at least one pneumatic cylinder for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm.;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion;

(d) a control means in operative connection with said powered means for maintaining active control over the reciprocal, rectilinear motion produced by the powered means, said control means being operable to control the reciprocal, rectilinear motion in a desired manner via a control signal provided to said powered means;

(e) a means for sensing force exerted upon said cannula by said powered means, said means for sensing cannula force being in operative connection with said control means; and

(f) a means for ceasing powered operation of said powered means when cannula force exceeds a predetermined threshold value, said means for ceasing powered operation being in operative connection with said means for sensing cannula force.

55. An automated system for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm.;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion;

(d) a control means in operative connection with said powered means for maintaining active control over the reciprocal, rectilinear motion produced by the powered means, said control means comprising means for providing a control signal to said powered means responsive to input from the group consisting of a predetermined waveform and feedback resulting from operation of said cannula, said control means being operable to control the reciprocal, rectilinear motion in a desired manner via the control signal provided to said powered means; and

(e) a protective sheath through which the cannula may pass to protect skin surrounding an incision.

56. A system according to claim 55 wherein said protective sheath comprises:

(a) a protective element, said protective element formed with a passage therethrough to allow the cannula to pass therethrough;

(b) an external abutment means attached to said protective element; and

(c) an expandable internal abutment means attached to said protective element.

57. The system of claim 56 wherein said expandable internal abutment means comprises an inflatable bladder.

58. The system of claim 56 wherein said external abutment means is pivotally attached to said protective element.

59. The system of claim 56 wherein said expandable internal abutment means is pivotally attached to said protective element.

60. A device according to claim 55 further comprising a handle means.

61. A device according to claim 60 wherein said handle means is in operative attachment with the cannula to substantially minimize the distance between an operator'"'"'s hand and a distal end of the cannula when the cannula is in a fully extended position.

62. An automated device for performing suction lipectomy comprising:

(a) a cannula;

(b) a powered means including at least one pneumatic cylinder for producing a reciprocal, rectilinear motion of the cannula, said motion being of a stroke length of at least 1 cm;

(c) a means for operatively connecting the cannula to said means for producing a reciprocal, rectilinear motion;

(d) a control means in operative connection, with said powered means for maintaining active control over the reciprocal, rectilinear motion produced by the powered means, said control means being operable to control the reciprocal, rectilinear motion in a desired manner via a control signal provided to said powered means; and

(e) a means for sensing force exerted upon said cannula by said powered means, said sensing means being in operative connection with said control means.

63. A device according to claim 62 further comprising a means for warning an operator when said force exerted upon said cannula by said powered means exceeds a predetermined threshold valve.