INTRAMUSCULAR INJECTION DEVICES
First Claim
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1. In a hypodermic injection assembly:
- a. a contained-needle type of hypodermic ampoule comprising a cylinder, a puncturable diaphragm closing and sealing one end of said cylinder, a slidable plunger in the opposite end of said cylinder and spaced from said diaphragm to provide a chamber therebetween, a liquid medicament in said chamber, and a hypodermic needle disposed in said chamber for movement by said plunger to a preinjection position in which a discharge end portion of the needle has pierced and extends beyond said diaphragm in an exposed condition and thereafter to transmit medicament from said chamber into a patient receiving an injection while moving further through said diaphragm, the volume of medicament in said chamber being substantially less than the initial volume of said chamber to permit movement of the plunger to project the needle to said preinjection position before expressing medicament from the chamber through the needle;
b. an applicator for actuating said ampoule to perform an injection after the needle has been projected to its preinjection position, said applicator comprising a housing having an open end for insertion of said ampoule into the housing with the needle directed axially outwardly relative to said opening until the pointed end of the needle in its preinjection position is within the housing, releasable spring clip means carried by said housing and yieldably restraining said ampoule against reverse movement toward said opening, the restraining force exerted by said spring clip means being less than the force required to move said plunger relative to said cylinder, means operative first to move said ampoule past said spring clip means and toward said housing opening for projecting the needle from the housing substantially for its exposed length in its Preinjection position and then for moving said ampoule plunger and needle toward said ampoule diaphragm with a continuing force sufficient to express the medicament from said chamber through said needle and into a patient, said applicator housing including stop means engageable by said ampoule after it has been moved to project the needle into the patient for substantially the exposed length of the needle in its preinjection position, and said ampoule including radially projecting abutments spaced about its periphery for initial restraining engagement by said spring clip means and subsequent positive restraining engagement by said stop means, said spring clip means and said stop means being discontinuous circumferentially of said housing to permit passage of said abutment thereby during insertion of the ampoule and engagement of said abutments thereby after relative rotation of the inserted ampoule about a common axis of said housing and ampoule;
whereby operation of said means to move said ampoule while the open end of the applicator is held against the skin of a patient first moves said ampoule and needle to cause the needle to penetrate into the patient for substantially the exposed length of the needle in said preinjection position and then moves said ampoule plunger toward said ampoule diaphragm for further advancing the needle into the patient while expressing medicament from said ampoule chamber through said needle and into the patient.
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Abstract
An intramuscular injection ampoule of the contained-needle type and a combination of such an ampoule with a so-called '"'"''"'"''"'"''"'"'applicator'"'"''"'"''"'"''"'"' for actuating the ampoule to make injections are disclosed. The ampoule has at least one cylindrical, medicamentcontaining chamber and a plunger closing one end thereof. A hollow needle is fixed to the plunger and is initially contained within such a chamber. The other end of the ampoule is sealed by a diaphragm. The ampoule is only partially filled with a medicament so that the needle may be advanced through the diaphragm to a preinjection position. The ampoule is then positioned in an applicator and is retained therein by releasable spring clips. A spring-loaded force-applying member drives the ampoule past the clips so that the needle enters the patient'"'"''"'"'s muscle and then the plunger is moved relative to the cylinder to inject the medicament.
26 Citations
4 Claims
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1. In a hypodermic injection assembly:
- a. a contained-needle type of hypodermic ampoule comprising a cylinder, a puncturable diaphragm closing and sealing one end of said cylinder, a slidable plunger in the opposite end of said cylinder and spaced from said diaphragm to provide a chamber therebetween, a liquid medicament in said chamber, and a hypodermic needle disposed in said chamber for movement by said plunger to a preinjection position in which a discharge end portion of the needle has pierced and extends beyond said diaphragm in an exposed condition and thereafter to transmit medicament from said chamber into a patient receiving an injection while moving further through said diaphragm, the volume of medicament in said chamber being substantially less than the initial volume of said chamber to permit movement of the plunger to project the needle to said preinjection position before expressing medicament from the chamber through the needle;
b. an applicator for actuating said ampoule to perform an injection after the needle has been projected to its preinjection position, said applicator comprising a housing having an open end for insertion of said ampoule into the housing with the needle directed axially outwardly relative to said opening until the pointed end of the needle in its preinjection position is within the housing, releasable spring clip means carried by said housing and yieldably restraining said ampoule against reverse movement toward said opening, the restraining force exerted by said spring clip means being less than the force required to move said plunger relative to said cylinder, means operative first to move said ampoule past said spring clip means and toward said housing opening for projecting the needle from the housing substantially for its exposed length in its Preinjection position and then for moving said ampoule plunger and needle toward said ampoule diaphragm with a continuing force sufficient to express the medicament from said chamber through said needle and into a patient, said applicator housing including stop means engageable by said ampoule after it has been moved to project the needle into the patient for substantially the exposed length of the needle in its preinjection position, and said ampoule including radially projecting abutments spaced about its periphery for initial restraining engagement by said spring clip means and subsequent positive restraining engagement by said stop means, said spring clip means and said stop means being discontinuous circumferentially of said housing to permit passage of said abutment thereby during insertion of the ampoule and engagement of said abutments thereby after relative rotation of the inserted ampoule about a common axis of said housing and ampoule;
whereby operation of said means to move said ampoule while the open end of the applicator is held against the skin of a patient first moves said ampoule and needle to cause the needle to penetrate into the patient for substantially the exposed length of the needle in said preinjection position and then moves said ampoule plunger toward said ampoule diaphragm for further advancing the needle into the patient while expressing medicament from said ampoule chamber through said needle and into the patient.
- a. a contained-needle type of hypodermic ampoule comprising a cylinder, a puncturable diaphragm closing and sealing one end of said cylinder, a slidable plunger in the opposite end of said cylinder and spaced from said diaphragm to provide a chamber therebetween, a liquid medicament in said chamber, and a hypodermic needle disposed in said chamber for movement by said plunger to a preinjection position in which a discharge end portion of the needle has pierced and extends beyond said diaphragm in an exposed condition and thereafter to transmit medicament from said chamber into a patient receiving an injection while moving further through said diaphragm, the volume of medicament in said chamber being substantially less than the initial volume of said chamber to permit movement of the plunger to project the needle to said preinjection position before expressing medicament from the chamber through the needle;
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2. A hypodermic injection assembly according to claim 1 including a cup-shaped needle guard removably secured to the diaphragm end of said ampoule, said guard having a bottom wall spaced from said diaphragm by a distance exceeding the length of said end portion of the needle in its preinjection position.
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3. In a hypodermic injection assembly:
- a. a contained-needle type of hypodermic ampoule comprising a cylinder, a puncturable diaphragm closing and sealing one end of said cylinder, a slidable plunger in the opposite end of said cylinder and spaced from said diaphragm to provide a chamber therebetween, a liquid medicament in said chamber, and a hypodermic needle disposed in said chamber for movement by said plunger to a preinjection position in which a discharge end portion of the needle has pierced and extends beyond said diaphragm in an exposed condition and thereafter to transmit medicament from said chamber into a patient receiving an injection while moving further through said diaphragm, the volume of medicament in said chamber being substantially less than the initial volume of said chamber to permit movement of the plunger to project the needle to said preinjection position before expressing medicament from the chamber through the needle;
b. an applicator for actuating said ampoule to perform an injection after the needle has been projected to its preinjection position, said applicator comprising a housing having an open end for insertion of said ampoule into the housing with the needle directed axially outwardly relative to said opening until the pointed end of the needle in its preinjection position is within the housing, detent means yieldably restraining said ampoule against reverse movement toward said opening, means operative first to move said ampoule past said detent means and toward said housing opening for projecting the needle from the housing substantially for its exposed length in its preinjection position and then for moving said ampoule plunger and needle toward said ampoule diaphragm with a continuing force sufficient to express the medicament from said chamber through said needle and into a patient, said applicator housing including stop means engageable by said ampoule after it has been moved to project the needle into the patient for substantially the exposed length of the needle in its preinjection position, and said ampoule including radially projecting abutments spaced about its periphery for intial restraining engagement by said detent means and subsequent positive restraining engagemenT by said stop means, said detent means and said stop means being discontinuous circumferentially of said housing to permit passage of said abutments thereby during insertion of the ampoule and engagement of said abutments thereby after relative rotation of the inserted ampoule about a common axis of said housing and ampoule;
whereby operation of said means to move said ampoule while the open end of the applicator is held against the skin of a patient first moves said ampoule and needle to cause the needle to penetrate into the patient for substantially the exposed length of the needle in said preinjection position and then moves said ampoule plunger toward said ampoule diaphragm for further advancing the needle into the patient while expressing medicament from said ampoule chamber through said needle and into the patient.
- a. a contained-needle type of hypodermic ampoule comprising a cylinder, a puncturable diaphragm closing and sealing one end of said cylinder, a slidable plunger in the opposite end of said cylinder and spaced from said diaphragm to provide a chamber therebetween, a liquid medicament in said chamber, and a hypodermic needle disposed in said chamber for movement by said plunger to a preinjection position in which a discharge end portion of the needle has pierced and extends beyond said diaphragm in an exposed condition and thereafter to transmit medicament from said chamber into a patient receiving an injection while moving further through said diaphragm, the volume of medicament in said chamber being substantially less than the initial volume of said chamber to permit movement of the plunger to project the needle to said preinjection position before expressing medicament from the chamber through the needle;
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4. A hypodermic injection assembly according to claim 3, including a cup-shaped needle guard removably secured to the diaphragm end of said ampoule, said guard having a bottom wall spaced from said diaphragm by a distance exceeding the length of said end portion of the needle in its preinjection position.
Specification
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Current AssigneeHurschman A
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Original AssigneeHurschman A
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InventorsHURSCHMAN A
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Application NumberUS05/283,505Time in Patent Office673 DaysField of SearchUS Class Current604/196CPC Class CodesA61M 5/28 Syringe ampoules or carpule...A61M 5/284 comprising means for inject...A61M 5/285 with sealing means to be br...A61M 5/288 by piercing without interna...A61M 5/3243 being axially-extensible, e...A61M 5/329 characterised by features o...
