Surgery – Instruments – Cutting – puncturing or piercing
Patent
1990-09-07
1991-10-08
Rosenbaum, C. Fred
Surgery
Instruments
Cutting, puncturing or piercing
30321, 30338, A61B 1732
Patent
active
050551060
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a scalpel comprising a shank having a holder for releasably mounting a surgical blade, said holder including a sleeve threadedly engaged with the shank at one end thereof to be screwed axially along the shank and forming a ball socket, a ball on the blade to be received in said ball socket, and a clamping rod extending axially within the socket between the shank and the ball to engage and disengage said ball by the sleeve being screwed on the shank.
A scalpel of this type is shown and described in CH-A-490 072. The rod projecting from the shank and being integral therewith, at the free end forms a seat which can be engaged with and can partially receive therein the ball of the blade by screwing the sleeve on the shank so that the ball will be clamped in the ball socket. The ball and the ball socket form a universal joint which allows the blade to be adjusted to different angles on the shank and to be locked in the desired angular position.
Many types of surgery cause specific access problems, and this is particularly true as far as oral surgery is concerned (gingival operations, extraction of wisdom-teeth etc), joint surgery and surgical intervention in ears, nose and throat. In these cases it may be difficult to obtain access by means of a common straight scalpel. It may be necessary to use angled scalpels or reversed knives which are used for example in gingival operations. Scalpels of the type mentioned above have been proposed in order to allow extraordinary access in different surgical operations of any type.
In the prior art scalpel referred to above the ball and thus the blade is locked in the desired angular position by the frictional engament between the ball at one hand and the seat of the rod and the ball socket at the other hand, and accordingly it is necessary to securely tighten the sleeve on the shank to be sure that the angular position of the blade will not change or the blade will come loose when the scalpel is being used.
The purpose of the present invention is to provide a scalpel of the type referred to above wherein the blade is more securely anchored to the shank in the desired angular position, which is an absolute central requirement in oral surgery wherein an instrument of this type definitely shall not be allowed to come loose.
For said purpose the scalpel of the invention has obtained the characteristic features appearing from claim 1.
In order to explain the invention in more detail an embodiment thereof will be described below reference being made to the accompanying drawing in which
FIG. 1 is a side view of a scalpel of the invention,
FIG. 2 is an enlarged side view of the blade and an element forming the circular sharp edge to be engaged with the ball, said element being partly shown in axial cross sectional view,
FIG. 3 is a fragmentary enlarged axial cross sectional view of the blade end of the scalpel without the blade, and
FIG. 4 is a view similar to that in FIG. 3 with the blade mounted to the shank.
The surgical blade shown in the drawing comprises a metal portion 10 forming the actual blade (the knife edge), and on this metal portion a plastic body 11 is formed by injection molding, said plastic body forming a neck 12 and a ball 13. On the shank 14 of the scalpel there is provided for the attachment of the blade a sleeve 15 which forms a spherical ball socket 16 available from the outside through a side aperture 17. Moreover, the sleeve has a slot 18 joining the aperture 17. The sleeve is threadedly engaged with the shank, and for this purpose the shank forms a thicker end portion 19 with a bore 20 having an inside screw thread. The sleeve 15 having an outside screw threadedly engages the inside screw thread of the portion 19 and can be displaced axially into and out of the bore by the sleeve being rotated and thus being screwed on the shank. In the sleeve a clamp rod 21 is received, and this rod has at the end adjacent the ball socket a circular sharp edge 22, FIG. 2, having a diameter which is considerably smaller than the diameter of the ba
REFERENCES:
patent: 2425665 (1947-08-01), Arden
patent: 3609864 (1971-10-01), Bassett
patent: 4275735 (1981-06-01), Chutter
patent: 4672964 (1987-06-01), Dee et al.
patent: 4788070 (1986-12-01), Dee
patent: 4844976 (1989-07-01), Dee
Lewis William W.
Rosenbaum C. Fred
LandOfFree
Scalpel does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scalpel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scalpel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-255012