Injection method and apparatus
First Claim
1. A medication delivery apparatus comprising:
- a housing for receiving a medication containing member;
a drive member mounted within the housing for engaging with the medication containing member and moveable axially within the housing;
a spring contained within the housing and coupled to the drive member;
a dose setting knob coupled to said spring, and rotatably coupled to the housing such that rotation of the knob relative to the housing in a first direction results in compression or twisting of the spring;
a user actuable trigger for releasing the spring to push the drive member through the housing; and
a user actuable button coupled to said housing for axial motion relative thereto, said button being coupled to said spring to cause the spring to unwind or expand without causing any substantial movement of said drive member.
1 Assignment
0 Petitions
Accused Products
Abstract
A pen-type injector for receiving a medication containing member. The injector comprises a housing 1 and a torsion spring 4 contained within the housing and coupled to a drive member 8. A dose setting knob 2 is coupled to the spring 4, and rotatably coupled to the housing 1 such that rotation of the knob relative to the housing in a first direction results in compression or twisting of the spring. A user actuable trigger 12 is provided for releasing the spring 4 to push the drive member 8 through the housing 1. A user actuable button 6 is coupled to the housing 1 for axial motion relative thereto, said button 6 being coupled to the torsion spring 4 to cause the spring to unwind or expand in discrete steps with each press of the button.
223 Citations
23 Claims
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1. A medication delivery apparatus comprising:
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a housing for receiving a medication containing member;
a drive member mounted within the housing for engaging with the medication containing member and moveable axially within the housing;
a spring contained within the housing and coupled to the drive member;
a dose setting knob coupled to said spring, and rotatably coupled to the housing such that rotation of the knob relative to the housing in a first direction results in compression or twisting of the spring;
a user actuable trigger for releasing the spring to push the drive member through the housing; and
a user actuable button coupled to said housing for axial motion relative thereto, said button being coupled to said spring to cause the spring to unwind or expand without causing any substantial movement of said drive member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A medication delivery apparatus for receiving a medication containing member, the apparatus comprising:
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spring means for storing a force which when released causes ejection of the medication from a received medication containing member;
a dose knob which when rotated in a first direction moves the spring to a force storing position, the dose setting knob providing a plurality of discrete setting positions corresponding to respective doses;
a user actuable trigger for releasing said stored force to eject medication from said medication containing member; and
a user actuable button arranged to reduce a stored force in the spring with each press of the button without causing ejection of medication from said medication containing member. - View Dependent Claims (14, 15)
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16. A method of setting a dose of medication to be ejected from a medication containing member received within a dose delivery apparatus, the method comprising:
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rotating a dose knob of the apparatus in a first direction to one of a plurality of discrete positions corresponding to respective doses; and
changing the set dose to a reduced dose by depressing a button one or more times. - View Dependent Claims (17)
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18. A medication delivery apparatus comprising:
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a housing for receiving a medication containing member;
a drive member mounted within the housing for engaging with the medication containing member and moveable axially within the housing;
a spring contained within the housing and coupled to the drive member;
a dose setting knob coupled to said spring, and rotatably coupled to the housing such that rotation of the knob relative to the housing in a first direction results in compression or twisting of the spring;
spring retaining means comprising a toothed rack coupled to one of the housing and the dose knob and at least one spring mounted tooth coupled to the other of the housing and the dose knob, the or each tooth engaging the toothed rack to prevent a force stored on the spring from moving the spring to release the force, whilst allowing a user to rotate the dose knob in a second, reverse direction, to reduce a set dose; and
a user actuable trigger for releasing the spring to push the drive member through the housing. - View Dependent Claims (19, 20, 21)
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22. A medication delivery apparatus comprising:
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a housing for receiving a medication containing member;
a drive member mounted within the housing for engaging with the medication containing member and moveable axially within the housing;
a torsion spring contained within the housing and coupled to the drive member;
a dose setting knob coupled to said spring, and rotatably coupled to the housing such that rotation of the knob relative to the housing in a first direction results in loading of the spring;
a user actuable trigger for releasing the spring to push the drive member through the housing; and
a rotatably mounted visual indicator for indicating the dose to be delivered, the rotatably mounted visual indicator being rotatable over at least one complete revolution.
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23. A medication delivery apparatus comprising:
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a housing for receiving a medication containing member;
a drive member mounted within the housing for engaging with the medication containing member and moveable axially within the housing;
a torsion spring contained within the housing and coupled to the drive member;
a dose setting knob coupled to said spring, and rotatably coupled to the housing such that rotation of the knob relative to the housing in a first direction results in loading of the spring;
a dial cam configured to co-operate with a dial key, such that upon rotation of the dose setting knob, the dial cam and the dial key co-operate to strain or release the torsion spring, depending upon the direction of rotation of the dose setting knob.
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Specification