Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-05-20
1999-11-16
Stright, Jr., Ronald
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604135, 604136, 604157, 604232, A61M 500
Patent
active
059849002
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to pen-shaped syringes with automatic needle insertion, which syringes have an injecting system comprising a basic part carrying a medicine reservoir being at its distal end provided with a hypodermic needle and being at its proximal end closed by a piston, a dosing mechanism having a carrier engaging a cogging on a piston rod to advance this rod in the distal direction to press the piston into the reservoir a distance corresponding to a set dose when an injection button is pressed, the injection system being integrally displaceable in a housing by a spring which may be compressed and released to displace the injection system in the distal direction in the housing to insert the needle into the skin of a patient.
Such pen shaped syringes are used by patients who treat themselves by frequently injecting a medicine dose which may be set individually immediately before each injection, and the setting is deleted when the injection is performed. Often the same dose is used by a number of injections, and consequently some patients might wish for a syringe by which the dose does not have to be set before each injection. Especially patients to whom a reduced tactile motor function makes it difficult to perform the setting would appreciate a syringe by which a setting is not deleted by the injection, but is remembered until it is altered voluntarily.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a syringe with automatic needle insertion, which syringe stores a setting of the dose and automatically sets that dose when the automatic needle insertion mechanism of the syringe is cocked.
This is obtained by a pen shaped syringe as described above, which syringe according to the invention is characterized in, that the carrier is coupled to a dose spindle in a rotatable but not displaceable way, the dose spindle being provided with a thread engaging a thread in a sequence part, the sequence part and the basic part of the injection system being provided with mutually engaging protrusions and slots allowing a set limited axial movement of these parts in relation to each other, the basic part being affected by a spring mounted to be compressed when the basic part is moved in the proximal direction in the housing by cocking forces exerted on the sequence part.
According to the invention, a ramrod may be mounted displaceably axially in the housing with an outer end accessible for operating the ramrod, and an inner end abutting a protrusion on the sequence part. Thereby it is ensured that the cocking force is exerted on the sequence part.
When the injection button has a diameter at least corresponding to the minor diameter of the housing and is secured to the dose tube at the proximal end of the syringe, this button may be gripped easily, even by patients with reduced tactile motor function, and by drawing the button in the proximal direction the force exerted on the button may via the dose spindle and the thread engaging the thread of the sequence part be transmitted to this part as a cocking force.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention is described in further details with reference to the drawing, wherein
FIG. 1 shows a sectional view along the axis of a pen-shaped syringe according to the invention,
FIG. 2 shows a sectional view along the axis of the syringe in FIG. 1 perpendicular to the view in that Figure,
FIG. 3 shows a protective cap seen from its proximal end.
DETAILED DESCRIPTION OF THE INVENTION
The pen shaped syringe with an automatic insertion of a needle shown in FIGS. 1 and 2 in its uncocked position comprises a housing 1 having an oval cross section and with a bore accommodating the mechanism for automatic needle insertion, dose setting, and injection. Partly inserted into the distal end of the housing 1 an intermediate tube 3 extends from this housing. At the outer end of the intermediate tube 3 a spacing tube 29 is mounted, which spacing tube 29 determines the depth of the needle insertion. An injectin
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Novo Nordisk A S
Stright, Jr. Ronald
Zelson, Esq. Steven T.
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