A peristaltic infusion pump with improved low flow performance. The pump includes a cam shaft having cams offset in an axial direction, pump fingers that engage a tube, each finger coupled to a respective cam, the fingers creating a pumping region and an occlusion region within the tube, a motor coupled to the cam shaft, a memory, and a controller. The controller implements cam rotation instructions received from the memory to cause the pump to position the fingers in the occlusion region prior to beginning an infusion therapy to deliver fluid to patient through the tube at a patient fluid delivery rate, rotate the cam shaft to transition the fingers from the occlusion region to the pumping region at a startup rate that is faster than a patient fluid delivery rate, and rotate the cam shaft at the patient fluid delivery rate in the pumping region.

An infusion device (3) for administering a medical fluid to a patient, comprises a housing (30) and a receptacle (300) arranged on the housing (30) for receiving a syringe (4), the syringe (4) having a barrel (41) for containing a medical fluid and a plunger (42) movable relative to the barrel (41) for delivering the medical fluid out of the barrel (41). A pusher device (32) is movable relative to the housing (30) for acting onto the plunger (42) for moving the plunger (42) relative to the barrel (41), and a drive mechanism (38) drives the pusher device (32). A coupling mechanism (36, 37) is operative to couple the plunger (42) to the pusher device (32) or to couple the pusher device (32) to the drive mechanism (38), and an actuation mechanism arranged on the pusher device (32) comprises an actuation element (33) for actuating the coupling mechanism (36, 37) between a coupling state and an uncoupling state. Herein, the actuation mechanism comprises a first threaded element (34) rotatable about a rotational axis (342) and a second threaded element (331) movable along the first threaded element (34), the second threaded element (331) being in threaded engagement with the first threaded element (34) such that the first threaded element (34) is rotated when the second threaded element (331) is moved along the first threaded element (34), wherein the actuation element (33) is actuatable to move the second threaded element (331) along the first threaded element (34), the first threaded element (34) being operatively connected to the coupling mechanism (36, 37). In this way an infusion device is provided which in an easy and comfortable manner allows a user to actuate a coupling mechanism, in particular for installing a syringe on a receptacle of the infusion device.

A driving structure and an injection machine are disclosed. The driving structure includes: a driving device, a first swinging assembly and a second swinging assembly, the first swinging assembly and the second swinging assembly both comprise a swinging block and a moving block, the swinging block is in contact with the moving block, the swinging block of the first swinging assembly and the swinging block of the second swinging assembly are both connected with an output end of the driving device, the swinging block in the same swinging assembly is configured to drive the moving block to move, and a working stroke of the moving block in the first swinging assembly and a working stroke of the moving block in the second swinging assembly are carried out at intervals.

A patch-type drug infusion device, includes a control structure provided with multiple first fastening portions and first electrical contacts; and an infusion structure, including a case, provided with multiple second electrical contacts and second fastening portions that cooperate with the first fastening portions, an outward extending portion provided on the case, and a block provided on the outside of the outward extending portion. The first fastening portions and the second fastening portions are fastened, making the control structure and the infusion structure assembled together, the first electrical contacts connect with the corresponding second electrical contacts. The block can prevent the control structure from detaching from the infusion structure.

A rotary pump for a fluid metering system is provided. The rotary pump reciprocates, and is reversed by a signal from a limit switch that is deflected by an actuator arm on a rotating sleeve of the pump system.

Devices, systems, and methods are provided herein for delivering medication (e.g., insulin) via a wearable pump having a patch-style form factor for adhesion to a user's body. The reusable pump may be coupled to a disposable cap housing a microdosing system for delivering precise, repeatable doses of medication to a cannula configured to deliver medication to a target infusion area beneath the user's outer skin layer. The system further may include an applicator for inserting the cannula into the user's skin and/or applying an adhesive pad to the skin.

Ratchet-based drive systems for more reliable and safer drug delivery are provided. The ratchet-based drive systems restrict angular movement and/or linear movement of components that cause a plunger to expel a liquid drug from a drug container. Movement of the components can be restricted to correspond to a predetermined or desired portion of the liquid drug. In the case that control of the drive system is lost or fails, the maximum amount of drug that could be delivered is limited to a known amount, thereby reducing the likelihood of an overdose.

An ophthalmic device including a cannula having a cannula distal end, a lumen, and one or more orifices coupled to the lumen is provided. The cannula is configured to deliver a fluid. A sleeve is disposed around the cannula and has a sleeve distal end. A handle is coupled to the sleeve and the cannula, the handle having an actuator. An internal mechanism is coupled to the actuator and configured to retract the sleeve relative to the cannula. The internal mechanism includes a follower fixedly coupled to the sleeve and moveable between distal and proximal positions, and a release member movable between an activated position and a release position. The release member is coupled to the actuator and configured to release a force that urges the follower from the distal position to the proximal position when the release member moves from the activated position to the release position.

An ophthalmic device including a cannula having a cannula distal end, a lumen, and one or more orifices coupled to the lumen is provided. The cannula is configured to deliver a fluid. A sleeve is disposed around the cannula and has a sleeve distal end. A handle is coupled to the sleeve and the cannula, the handle having an actuator. An internal mechanism is coupled to the actuator and configured to retract the sleeve relative to the cannula. The internal mechanism includes a follower fixedly coupled to the sleeve and moveable between distal and proximal positions, and a release member movable between an activated position and a release position. The release member is coupled to the actuator and configured to release a force that urges the follower from the distal position to the proximal position when the release member moves from the activated position to the release position.

The dosing apparatus comprises a conveying device (5), which is driven by at least one conveying drive (4), for conveying fluid from the interior (3) of a container (2). The fluid by means of the conveying device (5) is conveyable from the container to a dispensing opening (6). The conveying device (5) comprises a cylinder (7) having at least one intake opening (11) and at least one outlet opening (12) on an inner cylinder wall (8), and a first piston (9) and a second piston (10). The first piston (9) and the second piston (10) are mounted within the cylinder (7) so as to be displaceable in the longitudinal direction. Furthermore, the first piston (9) and the second piston (10) between the end sides thereof and together with a portion of the inner cylinder wall (8) delimit a variable fluid volume (17).