US 2389355 A
Description (OCR text may contain errors)
Nov. 20, 1945. P. P. GoLAND ET Al.Vv
SURGICAL NEEDLE Filed Jan. 27, 1943 llllllllllllllllllllllllllll t 4illlll|1 l Patented Nov. 20, i945 2,389,355 ennuient NEEDLE Application January 27, 1943, Serial No. 473,736
(Cl. 12S-214) 6 Claims.
The inventio-n relates to intravenous needles and has as an object the provision of a needle having a point which is concealed after insertion.
It is a further object of the invention to provide a needle having a cannula that may be readily removed for cleaning should it be clogged as by a clot.
A further object of the invention is the provision of a needle having provisions for preventing of stoppage of the cannula while being entered.
A still further object of the invention is the provision of a needle so constructed that when the inserting grip of the operator is released, ilow of injection fluid will immediately begin.
Further objects of the invention will .appear from the following description when read in connection with the accompanying drawing showing an illustrative embodiment of the invention, and wherein:
Figure l is a central longitudinal section on line i-i of Figure 3;
Fig. 2 is a similar section of the needle with hose attached as when injection is taking place; and
Fig. 3 is a transverse section on line 3 3 of Figure 1.
As shown in Figure l the device comprises an outer cannula lil associated with a base member il by means of a quick detachable joint or lock shown as oi the form disclosed in Patent No. 1,742,497 and comprising an interior thread l2 coacting with projections i3 carried by the base of the outer cannula. This form of lock is shown for illustration only as any form of quick detachable positive lock such as a bayonet joint may be used.
Slidable within the outer cannula lil there is shown an innerl cannula lll carried by an adapter base i5. A fluid tight spring connection is shown between base il and base l5 in the form of a rubber collar it, received by the ribbed portions Il, I8 of the bases.
Housed in the inner cannula lf3 there is shown a rod i9 formed with a base 26 and having its outer end beveled as at 2l to stand flush with the beveled cutting edge of the inner cannula. To preserve a correct relation of rotation between the rodlS and the cannula Sil, the base 2@ is shown as formed with a rib 2i entering a groove 22 in the face of the base l5.
The adapter base l l is shown as provided with finger grip wings 23, 24 which may be formed as desired for engagement between the first and second fingers of a hand with the thumb engaging the. face of thel member 25 of base 2i). When so grasped, pressure exerted by the thumb will cause compression of the resilient connector viii and thereby the cutting end of the inner cannula le, closed by the rod it will be projected from cannula EB for insertion of the latter through the skin into a vein, and upon release of the pressure of the thumb the cutting end of the inner cannula will be automatically retracted into the position shown in Figures 1 and 2.
The form of resilient member iii is shown for purposes of illustration only. It is evident that a coiled metallic spring may be utilized if de sired, covered with a non-resilient, flexible, uid tight sleeve.
In operation the structure of Figure 1 may be applied to the vein as indicated above, whereupon the rod i9 may be withdrawn and the connector 2li carrying tubing 2l may be placed in lieu of the member 2G whereupon injection will pro ceed. Alternatively the structure as shown in Figure 2 may be utilized without the rod I9. In that case the thumb may be pressed upon the tubing 2l at the point 23 with the rst and sec ond ngers of the same hand hooked about members 23, 2li whereby the pressure exerted to project the cutting cannula will collapse the tubing, cutting ofi iow of liquid through the tubing until insertion is accomplished, When release of the grip will both permit retraction of the cannula il and initiation of flow of liquid into the vein.
In either use of the device oi the invention no blood can escape backward through the needle while it is being inserted. If desired when the second described procedure is adopted the inner cannula may be allowed to ll with the liquid from tube Z'l before pressure is applied at point 23, in order to keep the same from beingstopped by a clot during insertion.
It will be seen that when the assembly of the inner cannula i4, the adapter member li, the spring connector l5 and the adapter base I5, is removed by breaking of the joint i2, I 3, the tapered portion 29 may be inserted into the socket 39 formed in the base of the outer cannula, in place of the tapered portion 3! and injection may proceed while the inner cannula cleared of a stoppage.
To those skilled in the art the operation of the device in use will be obvious from an inspection of the drawing. When the structure of Figure 1 has been applied to the vein as indicated herein, and the pressure on the spring Iii released, the resultant retraction of the inner cannula i4 to il is beingV the position wherein its cutting edge 2l is completely housed in the outer cannula, will leave the chamfered edge of the end of the cannula I0 for contact with the interior of the vein. Thus the possibility of injury of the delicate vein tissue by movement of the cutting edge, by which the outer cannula was introduced, is avoided.
In use of the device for injections,v the outer cannula may be in the vein for periods of twentyfour hours at a time. Many things may happen in this time. The inner cannula may become clogged and require removal for clearing while the fitting 2B, 29 is applied to the outer cannula to avoid interruption of injection. During these manipulations the absence of a cutting edge on nector; said one members being alikewhereby said joint may be separated and the remaining member of said tube connector may take the place of said second member to place a tube into direct communication with said outer cannula.
2. The structure of claim 1 wherein one of said cannulae is formed with a piercing extremity.
3. The structure of claim 1 wherein the inner cannula is formed with a piercing extremity normally housed within the extremity of the outer cannula, and is slidable to cause said piercing extremity to project for insertion ofv the needle.
4. A surgical needle comprising, in combination: an outer cannula having one element of a detachable joint; an inner cannula assembly comprising, a member carrying a second element of said joint and formed with a through passage, a cannula slidable in said passage and said rstnamed cannula and formed with a piercing extremity and with a tube connection adapter, and a resilient member connecting said member and said slidable cannula urging the latter to a position with its piercing extremity concealed within said outer cannula.
5. The combination of claim 4 wherein the resilient connection between said member and said slidable cannula is fluid tight.
6. The combination of claim 4 with finger grip means carried by said member.
PHILIP P. GOLAND. CHARLES R. DREW.