Therapeutic product delivery device with occlusion detection via electric contacts
A therapeutic product delivery device is described, which comprises a circuit layer, an actuator layer carrying an actuator, an occlusion detection layer ( 118 ), and a valve layer, through which a therapeutic product is conveyed by the action of the actuator. A plurality of conductive pins ( 155 ) extend from the circuit layer through or to each of the actuator layer, the occlusion detection layer and the valve layer, the conductive pins aligning the layers with each other. The occlusion detection layer comprises a plurality of contacts, each electrically connected to a respective one of the conductive pins, the contacts being provided at a detection region at which the therapeutic product is deposited in the event of a blockage. A blockage inhibiting the therapeutic product from being conveyed to the patient is detected when therapeutic product deposited in the detection region provides an electrical connection between the contacts. The conductive pins therefore provide at least two functions; firstly they align the layers of the cartridge (at assembly and during use), and a secondly they provide a conductive route between the circuit layer and the occlusion layer, permitting therapeutic product deposited at the occlusion layer to be able to complete an electric circuit with the circuit layer to enable occlusion detection.
1. A therapeutic product delivery device, comprising:
a circuit layer;
an actuator layer carrying an actuator;
an occlusion detection layer;
a valve layer, through which a therapeutic product is conveyed by an action of the actuator;
a plurality of conductive pins extending from the circuit layer through or to each of the actuator layer, the occlusion detection layer and the valve layer, the conductive pins aligning the layers with each other;
wherein the occlusion detection layer comprises a plurality of contacts, each electrically connected to a respective one of the conductive pins, the contacts being provided at a detection region at which the therapeutic product is deposited in an event of a blockage; and
wherein the blockage inhibiting the therapeutic product from being conveyed to the patient is detected when therapeutic product deposited in the detection region provides an electrical connection between the contacts.
2. The therapeutic product delivery device according to claim 1 , wherein the valve layer comprises an outlet valve via which the therapeutic product is required to pass to reach the patient, and a break-through valve through which the therapeutic product is only able to pass in the event that the blockage inhibits the therapeutic product from reaching the patient, the therapeutic product passing through the break-through valve being deposited at the detection region.
3. The therapeutic product delivery device according to claim 2 , wherein the break-through valve is disposed in series with, and at the exit of, the outlet valve.
4. The therapeutic product delivery device according to claim 2 , comprising a channel for carrying the therapeutic product from the break-through valve to the detection region.
5. The therapeutic product delivery device according to claim 1 , wherein a control circuitry is responsive to therapeutic product being detected in the detection region to trigger an alarm at the therapeutic product delivery device and/or at a control device.
6. The therapeutic product delivery device according to claim 1 , wherein a control circuitry is responsive to therapeutic product being detected in the detection region to discontinue the operation of the actuator.
7. The therapeutic product delivery device according to claim 1 , wherein the occlusion detection layer and the valve layer are sealed from the circuit layer by a seal layer.
8. The therapeutic product delivery device according to claim 1 , comprising a reservoir for storing the therapeutic product, and wherein the valve layer comprises a pumping chamber from which the therapeutic product is pumped by action of the actuator, and wherein the pumping chamber is refilled from the reservoir via an inlet valve.
9. The therapeutic product delivery device according to claim 1 , wherein the circuit layer, the actuator layer, the occlusion detection layer and the valve layer are disposed in this order.
10. The therapeutic product delivery device according to claim 1 , wherein the delivery device comprises the circuit layer, the actuator layer, the occlusion detection layer and the valve layer in a cartridge part, and wherein the delivery device comprises a device body part comprising a battery and a control circuitry for applying an electric current to the actuator via the circuit layer, the cartridge part and the device body part being releasably engageable with respect to each other.