US2569901A - Syringe for regional anesthesis of the lower jaw - Google Patents

Description

Oct. 2, 1951 E. N. RICHARD 2,569,901

SYRINGE FOR REGIONAL ANAESTHESIS OF THE LOWER JAW Filed July 17. 1947 Patented Oct. 2, 1 951 ,SYRINGE'FOR REGIONAL ANESTHESIS OF THE LOWER JAW Ernest Nicolas Richard, Lille, France Application July 17, 1947, Serial No. 761,482 In France June 17, 1946 Section 1, Public Law 690, August 8, 1946 Patent expires June 17, 1966 Claims. 1 The regional anaesthesis of the lower jaw at Spixs spine presents such difiiculties that it is only very rarely'practised, notwithstanding the advantages that it presents both for the patient and for the surgeon or dentist. If it is efiected with an ordinary syringe provided with the usual needle, the traumatis-m and post-operational pains are hard for the patient to bear, and

furthermore ,breakages of needles are to ;be feared.

The present invention relates to improvements in syringes for the anaesthesis of the lower jaw at Spixs spine, and is characterised by the arrangement, on the ferrule carrying the needle, of a cursor, the position of which is adjustable, surrounding the needle over a certain length, and prolonged by a support carrying a ring designed on the one hand to limit the penetration of the needle and on the other hand to resist any excessive bending of the needle.

One embodiment of the invention is diagrammatically illustrated by way of example but not of limitation in the accompanying drawings, in which:

Figure 1 shows a syringe according to the invention in axial section;

Figure 2 is a profile view of the body of the syringe; and

Figure 3 is a diagram showing the curvature that may be assumed by the needle.

In these drawings, A is the barrel of the syringe, which may be of metal, glass or other material, and which is provided with suitable finger bars or handles 12 and c. It contains a piston d, equipped with a ring e. The two handles are held by a split collar f, maintained on the body by hooks or clasps g, g, and connected by longitudinal strips h, h to a sleeve 1'. This sleeve comprises a screw-threaded part for securely holding a ferrule K by means of a nut 9'.

The ferrule K comprises at one end a collar or flange upon which the nut 7' bears for the purpose of fixing the ferrule to the frusto-conical ground-in nozzle of the syringe barrel, and at the other end a screw-thread on to which is screwed a coupling tube m for securing the needle I. This coupling tube m has a screwthreaded extension along which can be screwed a cursor sleeve n, which surrounds the needle over a certain length, The needle Z is very fine, and is of a length of about fifty millimetres. It is constructed like the needles used for local anaesthesia.

Parallel to the bottom of the cursor sleeve n through which the needle passes, and about five millimetres beyond this bottom, is arranged aring 0, which is carried by a stem -q, which forms an extension of the cursor n. The cursor is locked in position by a lock-nut p. The stem or shank q enables the orientation of the bevel r of the needle to be marked. The.ring 0 limits the penetration of the needle into the flesh, resists any excessive deflection of the needle and converts the acute angled bend which might otherwise occur at the point 8 (Figure 3)., and which would involve the risk of breakage of the needle, into an open curve no longer involving any danger.

Furthermore, as a result of this arrangement of thering 0, in the event of the needle being broken by unskilful manipulation at the point where it leaves the cursor 12, there would remain outside the flesh a portion of the needle enabling it to be taken hold of and easily withdrawn.

A syringe has thus been provided which obviates all risk of the ferrule K falling off in the course of an operation, and enables long and very fine needles to be utilised with full security.

I claim:

1. A syringe for the anaesthesis of the lower jaw at Spix spine, comprising: a barrel, a nozzle at the outer end of the barrel, a ferrule engaging the outer end of the nozzle, a hollow needle carried by the ferrule, a cursor adjustable on the ferrule and surrounding the needle over part of its length, a rigid support constituting an integral extension of the cursor, and a rigid ring in a plane perpendicular to the axis of the syringe, integral with the support and encircling the needle, this ring being adapted to limit the penetration of the needle and to prevent excessive bending of the needle.

2. A syringe for the anaesthesis of the lower jaw at Spixs spine, comprising: a barrel, a nozzle at the outer end of the barrel, a ferrule engaging the outer end of the nozzle, a hollow needle carried by the ferrule, a cursor adjustable on the ferrule and surrounding the needle over part of its length, a look-nut for locking the cursor in its adjusted position, a rigid support constituting an integral extension of the cursor, and a rigid ring integral with the support and encircling the needle, this ring being adapted to limit the penetration of the needle and to prevent excessive bendin of the needle.

3. A syringe for the anaesthesis of the lower jaw at Spixs spine, comprising: a barrel, a nozzle at the outer end of the barrel, a ferrule engaging the outer end of the nozzle, a hollow needle carried by the ferrule, the needle having a beveled point, a cursor adjustable on the ferrule and surrounding the needle over part of its length, a rigid support constituting an integral extension of the cursor, the support being formed with a gap so positioned as to enable any deflection of the needle to be observed, and a rigid ring coaxial with the syringe barrel and integral with the support and encircling the needle, this ring being adapted to limit the penetration of the needle and to prevent excessive bending of the needle.

4. A syringe for the anaesthesis of the lower jaw at Spixs spine, comprising: a barrel, a nozzle at the outer end of the barrel, a ferrule engaging the outer end of the nozzle, a hollow needle carried by the ferrule, the needle having a beveled point, a cursor adjustable on the ferrule and surrounding the needle over part of its length, a rigid support constituting an integral extension of the cursor, the support consisting of a single shank located parallel to the axis of the'cursor; and in a predetermined'angular relationship to the bevel at the point of'the needle, so as to en.-

able the position of the bevel to be ascertained by inspecting the said shank, and a rigid ring integral with the support and encircling the needle,

the plane of the ring being parallel to the bottom 1 of the cursor this ring being adapted to limit the at the outer end of the barrel, a ferrule engaging the outer end of the nozzle, a hollow needle carried by the ferrule, a cursor adjustable on the ERNEST NICOLAS RICHARD.

ltEFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,320,536 Faleo et a1 Nov. 4, .1919 1,479,325 Schubnel Jan. 1, 1924 1,532,744 Hein Apr. 7 1925 1,774,707 Gau Sept. 2, 1930 1,832,533 Greasy Nov. 17, 1931 2,025,219 Smith Dec. 24, 1935 FOREIGN PATENTS V Number 'Country' Date Germany June 30, 1914

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