Surgery – Instruments – Internal pressure applicator
Patent
1993-12-01
1995-05-02
Rosenbaum, C. Fred
Surgery
Instruments
Internal pressure applicator
604104, 604267, A61M 2900
Patent
active
054115175
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cannula for evacuating a rinsing liquid during an endoscopic operation or examination.
It is well known that the good progress of surgical endoscopic operations, and more particularly arthroscopies by irrigation under constant pressure of physiological serum through an arthroscope, is associated with good circulation of the liquid that rinses the arthroscope through the cannula, which by continuously eliminating debris or blood lends transparency and guarantees visibility in the operation cavity. If this circulation ceases, because the evacuation cannula that is connected to suction becomes plugged, then the operative field becomes opaque virtually immediately.
In arthroscopy of the knee, the position of the suction cannula is preferably within a zone of the joint capsule where the visual field of the camera and the surgical instruments are not located, so as not to impede the movements of the surgeon's hands as he works, nor reduce the visual field. As a result, the zone most often used for placement of the cannula is the subquadricipital cul-de-sac. Given its position, the cannula is frequently isolated from the irrigation zone, in certain positions of the knee.
Under these particular conditions, and depending on the size of the synovial, it may happen that the irrigating liquid will not be able to move from the pouch where the arthroscope is located to that where the cannula is located. At that moment, the circulation that enables the rinsing is interrupted; the liquid rapidly becomes turbid and makes the operative field opaque, thus preventing any operation.
The present invention proposes to overcome this disadvantage, at least in part.
To that end, the subject of this invention is a cannula for evacuating a rinsing liquid during an endoscopic, and in particular arthroscopic, operation or examination, characterized in that it includes a tubular element that at least in part forms an evacuation conduit for the rinsing liquid; at least two lateral elongated slots made on either side of the portion of the evacuation conduit formed by the tubular element, beginning at one free end of this tubular element and extending over a portion of its length, forming two small tongues solid with this tubular element; a passage for connecting the conduit to the outside of the cannula; a spacer device for exerting forces upon the small tongues that tend to space the tongues apart on either side of the slot; means for controlling the spacer device that are capable of being maneuvered from outside the conduit through the passage; and sealing means for enabling the sealed passage of the control means from the exterior of the cannula to the spacer device, at least in the spaced-apart position of the small tongues.
The main advantage of the invention is due to the fact that the cannula acts as a spacer when it is introduced into the subquadricipital cul-de-sac. It thus keeps the joint capsule open, to enable good circulation of the liquid through the cavity between the entry of this liquid at the level of the arthroscope and its exit at the level of the cannula.
Further advantages will become more apparent from the ensuing description and from the accompanying drawings, which schematically and by way of example illustrate an embodiment of the cannula that the subject of the invention.
FIG. 1 is a lateral elevation view in partial section, of this cannula in a first working position.
FIG. 2 is a fragmentary view of FIG. 1, in a second position.
FIG. 3 is a lateral view of a knee in a position of extension, with a cannula of the prior art, seen in section.
FIG. 4 is a lateral view of the same knee in the position of flexion.
FIGS. 3 and 4 show a knee in which a cannula 10' can be seen, inserted into the anterior subquadricipital cul-de-sac 31; the operating zone is identified by reference numeral 30. As can be seen, when the cannula communicates with the operating zone 30 when the knee is in extension (FIG. 3), the communication is interrupted in the region of the arrow F when it is in flexio
REFERENCES:
patent: 765879 (1904-07-01), Campbell
patent: 1637264 (1927-07-01), Masonick et al.
patent: 1827497 (1931-10-01), Varney
patent: 2042900 (1936-06-01), James
patent: 2201749 (1940-05-01), Vandegrift
patent: 2541691 (1951-02-01), Eicher
patent: 4692153 (1987-09-01), Berlin et al.
Rosenbaum C. Fred
Van Over Perry E.
LandOfFree
Cannula for use during arthroscopic procedures does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cannula for use during arthroscopic procedures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cannula for use during arthroscopic procedures will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1133866