Surgery – Instruments – Internal pressure applicator
Reexamination Certificate
2000-01-27
2001-03-20
Buiz, Michael (Department: 3731)
Surgery
Instruments
Internal pressure applicator
C606S190000, C604S104000
Reexamination Certificate
active
06203559
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to surgical instruments, and more particularly to tissue dissection instruments for forming working cavities in tissue mass via blunt dissection.
BACKGROUND OF THE INVENTION
Certain known tissue dissection instruments are configured for insertion through a percutaneous incision to a layer or tissue plane which can be bluntly dissected via selective expansion or other reconfiguration of the instrument in situ. Such instruments commonly incorporate a tapered tip at a distal end of an elongated body to facilitate penetration of a tissue plane as the instruments is advanced along the plane through the incision. At a selected surgical site, such instruments commonly employ a flexible balloon disposed about the periphery of the instrument near the distal end and tapered tip in order to expand the dimensions, or otherwise reconfigure the instrument under control of applied fluid pressure.
In certain surgical procedures, blunt dissection of tissue by expansion of a peripheral balloon under fluid pressure may promote unnecessary and undesirable symmetry in dissected tissue about the elongated body of the instrument, with associated trauma and reduced control on the surgical procedure. Also, the fluid pressure required to inflate the balloon is usually manually generated using a syringe-like plunger mechanism that may be difficult to manipulate to generate the required pressure.
SUMMARY OF THE INVENTION
In accordance with the present invention, mechanical reconfigurations of a surgical instrument substantially at the distal end of an elongated body via manual controls located at a proximal end greatly facilitate selective shaping of working cavities formed in tissue mass, with associated tactile feel of operative conditions at the remote surgical site adjacent the distal end of the elongated body. Multiple designs of surgical instruments according to the present invention commonly promote re-configurations of the distal end of an elongated body, or cannula, under manual control thereof from a proximal end. Each such reconfigurable cannula includes at least one segment of an elongated body that may be displaced laterally from the elongation or central axis of the body, at least near the distal end thereof, in response to manual manipulations at the proximal end of the body. In this way, working cavities may be bluntly dissected within tissue mass in various shapes and orientations at remote surgical sites removed from a percutaneous incision.
Specifically, one or more movable elements arranged in symmetrical or asymmetrical configurations near the distal end of a cannula are disposed to expand laterally outwardly from the central axis to move adjacent tissue away from the cannula in the course of forming a working cavity at a remote surgical site. Such movable element(s) is/are mechanically linked to manual actuators such as levers, plungers, finger pads, and the like, near the proximal end of the cannula to facilitate manual manipulation of the remotely positioned movable elements, with tactile feedback to the surgeon regarding the operative conditions at the remote surgical site. Various auxiliary appliances such as an endoscope, and blunt-ended, tissue-dissecting tip positioned within, and at the distal end of the cannula, enhance the functionality of the movable elements on a tissue-dissecting cannula.
REFERENCES:
patent: 5667520 (1997-09-01), Bonutti
patent: 6030406 (2000-02-01), Davis et al.
Davis John W.
McFann Timothy B.
Buiz Michael
Fenwick & West LLP
Lewis William
Origin Medsystems
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