Piston stopper for injection device, product container and injection device
First Claim
1. A piston stopper for an injection device, for injecting a medical or therapeutic product by axially advancing said piston stopper into a product container, comprising:
- a stopper body;
a stopper body holder connected to a driven member of said injection device;
at least one sealing element for sealing off said product container from said stopper body, wherein a membrane body is connected to a proximal end of the stopper body, such that the stopper body does not come in contact with the product to be injected, said membrane body comprises said at least one sealing; and
a sensor coupled to the stopper body holder for detecting the pressure exerted by the product on a proximal end of the membrane body, wherein the sensor comprises a force transferring means that protrudes through an opening in the stopper body holder at a proximal end and extends axially through an opening of said stopper body and abuts an inner side of the membrane body.
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Accused Products
Abstract
The invention relates to a piston stopper for an injection device, for injecting a medical or therapeutic product by axially advancing a piston stopper into a product container, wherein the piston stopper includes a stopper body and a stopper body holder detachably connected to it, and wherein a membrane body is placed like a cap onto the stopper body and connected to it, the membrane body being formed from an elastic material, while the stopper body and the stopper body holder are manufactured from an inflexible material. The invention encompasses an embodiment wherein the stopper body holder supports a sensor which measures the pressure acting on the membrane body to enable the pressure to be monitored precisely, in order to detect leaks and blockages in injection devices.
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Citations
16 Claims
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1. A piston stopper for an injection device, for injecting a medical or therapeutic product by axially advancing said piston stopper into a product container, comprising:
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a stopper body; a stopper body holder connected to a driven member of said injection device; at least one sealing element for sealing off said product container from said stopper body, wherein a membrane body is connected to a proximal end of the stopper body, such that the stopper body does not come in contact with the product to be injected, said membrane body comprises said at least one sealing; and a sensor coupled to the stopper body holder for detecting the pressure exerted by the product on a proximal end of the membrane body, wherein the sensor comprises a force transferring means that protrudes through an opening in the stopper body holder at a proximal end and extends axially through an opening of said stopper body and abuts an inner side of the membrane body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An injection device for administering a medical or therapeutic product, comprising a piston stopper which can be axially advanced into a container for the product to be administered in order to force out the product, the piston stopper comprising:
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a stopper body; a stopper body holder connected to a driven member of said injection device; at least one sealing element for sealing off said product container from said stopper body, wherein a membrane body is connected to a proximal end of the stopper body, such that the stopper body does not come in contact with the product to be injected, said membrane body comprising said at least one sealing element; and a sensor coupled to the stopper body holder for detecting the pressure exerted by the product on a proximal end of the membrane body, wherein the sensor comprises a force transferring means that protrudes through an opening in the stopper body holder at a proximal end and extends axially through an opening of said stopper body and abuts an inner side of the membrane body. - View Dependent Claims (14, 15)
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16. A piston stopper for an injection device, for injecting a medical or therapeutic product by axially advancing said piston stopper into a product container, comprising:
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a stopper body, wherein an indentation is provided at the proximal end of the stopper body; a stopper body holder connected to a driven member of said injection device; at least one sealing element for sealing off said product container from said stopper body, wherein a membrane body is connected to a proximal end of the stopper body, such that the stopper body does not come in contact with the product to be injected, said membrane body comprises said at least one sealing element; and a sensor coupled to the stopper body holder for detecting the pressure exerted by the product on a proximal end of the membrane body, wherein the sensor comprises a force transferring means that protrudes through an opening in the stopper body holder at a proximal end and extends axially through an opening of said stopper body, such that the force transferring means protrudes through the indentation at the proximal end of the stopper body by a length of an axial adjusting path of the force transferring means and abuts an inner side of the membrane body.
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Specification