US 1591021 A
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c. T. DAVIS v NEEDLE Filed Sept... 27 1924 INVENTOR Charles Haw/s RNEY Patented July 6, 1926.
UNITED- STATES PATENT oHaaLns 1'.
Davis, or BEACON, NEW YORK, assmnoa T Davis one! naooxmm, NEW goax, a CORPORATION or Raw yoaxx'j',
- Application m September 27,1924. s ria1n6, .4b,2 3.:-
This invention is an imprpvement in needles, and with respect to its more specific features," in needles' designed forsurgeons use. i v,
' 5 With surgical needles, it is desirable that there be a substantially smooth surface from the point of the needle to the remote end of 'the suture, 'and a substantially uniform taper from thepoint to the suture, in order m that the suture may pass easily through the perforation made by the needle with a minimum of injury to the tissues and of pain to the patient.
With the usual construction of eyeletted needle, when-it is threaded, two thicknesses of thread are added to the. diameter of the needle at the eye. The opening made bythe needle must be materially enlarged to permit the passage of this bulk, which .moreover, has its large end toward the opening, presenting thus a large, blunt obstruction to the further passage of the needle.
The advantages in smooth and easy passage with gradual dilation of the needle opening and consequen slight bruising and crushing of the tissues, accruing from the smooth surface and uniform taper .of the needle, are nullified by the abrupt increase in diameter due to this bulk. Such constructions are also objectionable in that the loose end of the suture is liable to slip through the eye, necessitating a halt in proceedin s vfor rethreading.
With 'the object of eliminating this objectionable enlargement, needles have been made with axial sockets for receiving the suture, and in which the suture is held end to end, and -in'-.axial alinement with the needles" The formation of thesocket is an operaoperation,'as well as to provide a convenient means to secure the suture in the socket,
tion of some delicacy, and to facilitate suchnovel combination of parts fully described hereinafter, illustrated intheaccompanying drawings, and pointed out in the claims appended hereto, itbeingfunderstood that various changes in the for'myproportion, size and minor details ofco nstruction, within the scope of. the claims,'i m'ay.jbe resorted o. without departing fromf-the' -spirit the Invention,-
In the drawings:
Fig. 1 is a longitudinalfsection of one of the elements oflthe improved needle. Fig. 2 is a plan viewof the other element.
Fig. 3 isa longitudinal section of the parts or elements assembled.
Fig. 4: is a similar view of an alternate arrangement. t Fig. 5 is a similar section afterthe pointing of the needle. p T
' Fig. 6 is a plan view with parts broken away, showing the needle assembled with I the suture.
Fig. 7 needle.
In the resent embodiment of the inven"-" tion the improved needle is composed of two parts or elements, namely, the shell or outer part 1, and a center or inner part 2. y The latter part is a cylindrical body, of tempered material, as for instance, a piece of high carbon .steel wire, highly tempered, while the shell is of softer material, as for instance steel tubing, annealed and of a size and bored to snugly fit the suture. (Fig. 3).
The shell 1v is of greater length than the center, so that when the parts are assembled, the shell will extend beyond one end of the center to form a socket for receiving the suture.
The parts may be assembled as shown in Fig. 3, with the ends of the parts remote from the socket flush or they may be assembled as shown in Fig. 4, with the ele- 10 ment 2 extended beyond the element 1, at the end remote from the socket.
The parts are assembled, either in the mannershown in Fig. 3, or that shown in Fig. 4, and the shell is secured to the center, 5 by shrinking, sweating, or in any other suitable manner, after which the point 5 is formed on the needle.
It will be understood that the point 5 may be of any desired cross section, circular, or 110 is a plan view of the -finished 80 'ground, but the final productis the same.
polygonal, and it is vformed inanysuitable manner as for instance, bygrinding, ,When
the parts are assembled as shownin Fig.
3, a considerable portion of the shell mu st be ground away, while in'the Fig. 4 assemblage a. much less quantity must the After the grinding of the point, the needle presents at one end a point and at v the other a socket of asize suitable toreceive the end of the suture, and the -nee dle is connected to the suture :by placing the end of the suture in the socket. In order to hold the parts together, the free end of the socket is swaged upon the suture, as shown at 8 in Fig. 7. A construction is-. thus provided, wherein the needle vtapers smoot ly and uniformly fromv the point to the suture, and wherein the-largest diameter of the needle is largerthan-the largestzdiameter of the suture so that there will be no stretching of the needle opening "by the suture.
It will be evident from the description, that the completed needle will have a point of the hardest. steel, a shankof smooth but softer metal, but with a socket in lace of the usual eye. In practice, when the parts are arrangedias shown inglfi-g. 331, ;the -center -2 will be about'5/ of an inchshorter-than the needle, so that the-socket.willymeasurei of an inch in depth: The/depth ofithesocket is the same in :the Fig. '54 arrangement.
WVhile the improved needle will usually be omposed of a gtempcregl 1. enter: sandia softerhs'hell, }it will be. bvious -thatsbot-h I claimr '1. The method 1 of making aneed es, which consists in securing on a :gtemperejd shank,;.- a
closely fitting seamless vshell .of softer ma terial, with one 7 end of 1 the shell textending beyond thev-shank to viorma; seamless socket,
and tapering the other end of ithe. shellgand shankto-a point.
A J -ar i eo imanuf q nmaaneed composed pitatempered shank and azclosely fitting seamless shell of softer e-rn aterialpexs tending beyond the ;center at one -end1to form a socket, the otherend ef.:the shank Signed at Brooklyn .in the v.cQunty of} Kings. and State of New "York, this 112th day, of Sept A. D. 1924.
4 CHARLES DAVIS;
and shell tapered to :a point.