A nozzle unit (100) for oral healthcare is provided which comprises at least one nozzle orifice (5). The nozzle unit (100) is designed to be used in an oral irrigator and has at least one constructional feature configured to contribute to realizing a predetermined orientation of a flow (1) of irrigation fluid with respect to a subjects respective teeth (2, 3) and periodontal pockets when placed with the at least one nozzle orifice (5) in the vicinity of the subjects respective teeth (2, 3) at the position of interdental interfaces (4), namely an orientation from the at least one nozzle orifice (5) towards the periodontal pockets at a pocket inflow angle in a range of 10° to 50° and from the at least one nozzle orifice (5) towards the surface (7) of the subjects respective teeth (2, 3) at a surface impact angle in a range of 0° to 50°.

A nozzle unit (100) for oral healthcare is provided which comprises at least one nozzle orifice (5). The nozzle unit (100) is designed to be used in an oral irrigator and has at least one constructional feature configured to contribute to realizing a predetermined orientation of a flow (1) of irrigation fluid with respect to a subjects respective teeth (2, 3) and periodontal pockets when placed with the at least one nozzle orifice (5) in the vicinity of the subjects respective teeth (2, 3) at the position of interdental interfaces (4), namely an orientation from the at least one nozzle orifice (5) towards the periodontal pockets at a pocket inflow angle in a range of 10° to 50° and from the at least one nozzle orifice (5) towards the surface (7) of the subjects respective teeth (2, 3) at a surface impact angle in a range of 0° to 50°.

A pump assembly for a dental cleaning appliance includes a positive displacement pump including a fluid chamber and a fluid displacement member which is moveable in a linear direction relative to the fluid chamber, and a drive for actuating the pump to draw fluid into the fluid chamber through a fluid inlet. An energy storage device converts kinetic energy generated during actuation of the pump by the drive into potential energy, and stores the potential energy. A cam is connected to the drive for rotation relative to the fluid displacement member. The cam has a ramp extending about the fluid displacement member which is engaged by a cam follower connected to the fluid displacement member. As the cam moves relative to the fluid displacement member, the cam follower moves along the ramp to actuate the pump to draw fluid into the fluid chamber, and beyond the end of the ramp to enable the energy storage device to use the stored potential energy to actuate the pump to urge fluid from the fluid chamber.

A pump assembly for a dental cleaning appliance includes a positive displacement pump including a fluid chamber and a fluid displacement member which is moveable in a linear direction relative to the fluid chamber, and a drive for actuating the pump to draw fluid into the fluid chamber through a fluid inlet. An energy storage device converts kinetic energy generated during actuation of the pump by the drive into potential energy, and stores the potential energy. A cam is connected to the drive for rotation relative to the fluid displacement member. The cam has a ramp extending about the fluid displacement member which is engaged by a cam follower connected to the fluid displacement member. As the cam moves relative to the fluid displacement member, the cam follower moves along the ramp to actuate the pump to draw fluid into the fluid chamber, and beyond the end of the ramp to enable the energy storage device to use the stored potential energy to actuate the pump to urge fluid from the fluid chamber.

An apparatus for cooling tissues which are treated with an energy-based device, such as a laser, is disclosed. The apparatus comprises a spray nozzle which generates an atomized liquid spray for the treatment area, wherein the atomized liquid spray is based on a mixture of liquid and gas. Further, the spray nozzle comprises at least one liquid outlet which ejects a liquid, and at least one gas outlet which ejects a gas stream. Besides, the apparatus for cooling comprises at least one delivery means for delivering pressurized gas to the spray nozzle; and a pumping means for the liquid, wherein the pumping means is configured to operate in pulses.

An apparatus for cooling tissues which are treated with an energy-based device, such as a laser, is disclosed. The apparatus comprises a spray nozzle which generates an atomized liquid spray for the treatment area, wherein the atomized liquid spray is based on a mixture of liquid and gas. Further, the spray nozzle comprises at least one liquid outlet which ejects a liquid, and at least one gas outlet which ejects a gas stream. Besides, the apparatus for cooling comprises at least one delivery means for delivering pressurized gas to the spray nozzle; and a pumping means for the liquid, wherein the pumping means is configured to operate in pulses.

A droplet jet device configured to form a liquid into droplets to jet the droplets, the droplet jet device including a main body having a flow channel through which the liquid circulates, and a jet nozzle having at least one nozzle hole and spraying the liquid from the nozzle hole, wherein defining the number of the nozzle holes as N, a diameter of the nozzle hole as r [m], and a contour length of a cross-sectional surface of the flow channel as L [m], the following formula is fulfilled.

[00001]$0.188<\frac{1}{N^2}.Math.\frac{L^2}{r^3}<1.58\times {10}^{16}$

Various embodiments for cleaning carious regions of a tooth are disclosed herein. For example, a dental apparatus can include a fluid platform having a chamber sized and shaped to retain fluid. The chamber can be configured to be coupled to the tooth over the carious region. A pressure wave generator having a distal end may be configured to be positioned in the chamber. The pressure wave generator may be configured to generate pressure waves in the retained fluid sufficient to clean the carious region.

Various embodiments for cleaning carious regions of a tooth are disclosed herein. For example, a dental apparatus can include a fluid platform having a chamber sized and shaped to retain fluid. The chamber can be configured to be coupled to the tooth over the carious region. A pressure wave generator having a distal end may be configured to be positioned in the chamber. The pressure wave generator may be configured to generate pressure waves in the retained fluid sufficient to clean the carious region.

The present invention relates to a mouth cleaning device using incoming fluid, a mouth cleaning system comprising such device and a method for using the mouth cleaning device. The mouth cleaning device comprises: a housing extending in a longitudinal direction comprising: an incoming fluid inlet; an outgoing fluid outlet; a cleaning head with an incoming fluid outlet and an outgoing fluid inlet; and a cleaning head connector configured for connecting the cleaning head to the housing, and the cleaning head connector comprising an incoming fluid channel configured for operatively connecting the incoming fluid inlet and incoming fluid outlet, and an outgoing fluid channel configured for operatively connecting the outgoing fluid inlet and outgoing fluid outlet, wherein the cleaning head connector comprises an incoming fluid connection and an outgoing fluid connection that are provided at a connection distance in the longitudinal direction of the housing.