The present disclosure relates to an injection head of a needleless syringe, needleless syringe body, and needleless syringe. The injection head includes a medicine barrel and a piston rod. The medicine barrel opens at a rear end and has an injection micropore at a front end. A piston of a piston rod is movable within a chamber in an front-rear direction, the piston and a sidewall and a front wall of the medicine barrel jointly define a medicine liquid receiving chamber. The piston rod is provided therein with a medicine liquid channel. The injection head and the vial can be mounted together on the needleless syringe body, the medicine liquid can flow via the medicine liquid channel into the medicine liquid chamber, and the piston rod can eject medicine liquid within the medicine liquid receiving chamber outside via the injection micropore. According to the solution of the present disclosure, a vial, such as a cartridge vial and the like, can be received within a needleless syringe body, and medicine suctioning and injection can be completed efficiently and effortlessly during each use, where there is no need for removing the vial or separating the medicine barrel from the vial.

The present utility model provides an electrically powered needle-free injector (100), comprising: a needle-free injector body (120); and a needle-free injection end (130) extending distally from the needle-free injector body (120) for medicine administration, the needle-free injector body (120) comprises: a housing (3), an inside of which is divided into a pressurized injection chamber (123) and a motor chamber (124); a pressurized injection assembly (170) disposed within the pressurized injection chamber (123); a needle-free injector locking mechanism (180) at least partially disposed within the pressurized injection chamber; and a motor assembly (190) disposed within the motor chamber (124). The present utility model has a beneficial effect that it may provide a power source for the needle-free injector to electrically take medicine and inject by a built-in motor; it works reliably, is used conveniently, and has a small size.

A device for repetitive needleless injection including a handheld unit having at least a cell fillable with a liquid, and a propulsion mechanism to apply a sequence of pressure pulses to the liquid to eject a micro-jet of the liquid from the cell via an orifice with a velocity that is sufficient to enable the micro-jet to penetrate into the surface; a reservoir that is connected to the cell by a conduit to enable the liquid to flow from the reservoir to the cell; a controller that is configured to operate the propulsion mechanism repeatedly; and a unidirectional valve to enable flow of the liquid from the reservoir to the cell and to prevent backflow. The propulsion mechanism includes an impulse generator configured to displace an actuation surface to generate the pulse; a plunger to transmit the pulse to the cell, and a restoration mechanism to retract the plunger.

A needleless syringe comprises a main syringe body which is a main body thereof and which has, in the main body, a sliding movement passage connected to an opening provided on a front end surface of the main body; a holding unit which has an accommodating unit for accommodating an injection objective substance so that the injection objective substance is releasable; and a driver that is configured to apply energy to the holding unit in order to allow the holding unit to slide toward the opening. When the energy is applied by the driver to the holding unit disposed at the initial position, the holding unit slides in the sliding movement passage to abut against the opening at the abutment position, and thus the injection objective substance accommodated in the accommodating unit is discharged via the opening. Accordingly, the high injection performance of the needleless syringe is appropriately exhibited.

Method and surgical instrument for treating prostate tissue including a surgical instrument having a main body, a needle deployment port, a needle, first and second handles and a lockout release mechanism to limit needle extension. Additionally, a kit includes the surgical instrument, together with a cystoscope, and optionally a syringe and reservoir of ethanol. The method includes needle-less injection and visualizing the ethanol injection by delivering both an echogenic agent and ethanol either by needle or needle-less injection or by providing an ultrasonically visible marker near the tip of the ethanol delivery cannula. The method also includes extending the needle transversely of the instrument housing using a link assembly.

The devices, assemblies, and methods described herein utilize photoacoustic principals to create a jet of fluid using a ultrasonic resonance member and a pulsed laser light beam. The ultrasonic resonance member is a treated substrate having an liquid interface surface in contact with a fluid. When a pulsed laser light beam is applied to the treated substrate, pressure is generated via induced ultrasonic waves to urge the fluid into a jet stream.

A non-metal, polymeric tubular device for delivering a therapeutic fluid to a treatment site within a patient. The non-metal, polymeric tubular device can be fabricated using suitable high strength polymers and in some versions can be reinforced through the inclusion of reinforcement materials or braiding. The non-metal, polymeric tubular device can be fabricated so as to have a burst strength exceeding at least about 2,000 psi. The non-metal, polymeric tubular device can be fabricated so as to have distention properties, wherein an orifice or jet port located at a distal end of the polymeric tubular device retains its shape and/or size without suffering swelling that can have a detrimental impact on a fluid jet used to deliver the therapeutic fluid at the treatment site.

An apparatus for transdermal injection includes a sleeve including a proximal end, a distal end, and an inner wall surface extending along the sleeve from a first opening at the proximal end to a second opening at the distal end. The inner wall surface forms a channel in the sleeve, the channel having a first portion with a substantially frustoconical shape. The channel of the sleeve is configured to receive a substantially frustconically shaped injection cartridge, to substantially uniformly support the injection cartridge during a transdermal injection operation, and to prevent movement of the injection cartridge out of the distal end of the sleeve.

A device and a method for adjustable quantitative injection of high-pressure gas are provided, wherein the gas may have a pressure of 5 MPa or more than 5 MPa. The gas may be directly communicated with a gas tank in the mechanism or an external gas source, flows through corresponding valves, and is charged into a predetermined or adjustable reservoir. Alternatively, the valve may be time-controllable, and does not need the reservoir. The gas is ejected through a nozzle selected based on depth or range of injection, wherein a one-way valve is disposed between the nozzle and the body to prevent contamination due to backflow. The manipulator can exert an appropriate force onto a target portion of a human for gas injection, and when the injection is done, a biasing member can automatically return the mechanism to its original state, ready for the next injection.

An apparatus may include a plunger and a substantially cylindrical body. The substantially cylindrical body may include an end portion having rounded edges and may define a cavity sized to receive the plunger. The substantially cylindrical body may include at least one opening extending from the cavity to an external surface. The at least one opening may a substantially irregular shape. In some embodiments, the at least one opening may extend from the cavity through a nub to the external surface. The nub may have a rounded shape. In some embodiments, the substantially irregular shape may include one of a slit, an oval shape, an elliptical shape, an hourglass shape, a rectangular shape, and a diamond shape. In some embodiments, the opening may be part of a non-cylindrical fluid passage.