Patent Description:
Due to reasons of age, pathology, and the like, gingival atrophy and tooth gap expansion are prone to occur, which is easy to cause food residues. If the food residues cannot be cleaned in time, on the one hand, it will cause bad breath, and on the other hand, it is easy to cause various dental diseases, oral diseases and especially periodontitis.

In view of this situation, various dental flosses, interdental brushes, water flosses and other products have been developed on the market for users to choose. Particularly, due to convenient use and good cleaning effect, water floss products are oral cleaning products widely used on the current market.

The working principle of the water floss is to clean the teeth and the oral cavity by the impact force of a high-speed water column sprayed under a certain pressure. Therefore, the high-speed water column will inevitably generate a very large impact on the teeth, gingivae and the like in the oral cavity. However, according to their own oral conditions, the tolerance of each person to the impact force of the water column is different. Therefore, in the using process, each person needs to select different water column impact speeds according to their tolerance. The current water floss generally adopts a grading treatment method which allows the user to select different gears. Although this method is simple in operation, it is often impossible to select the most suitable water column impact force which considers both the cleaning effect and comfort.

In order to overcome the defects of the prior art and to enable the user to select the most comfortable water column impact force, it is necessary to develop an oral irrigator capable of continuously adjusting the water volume.

<CIT> describes a personal care device, such as an oral care device, provided with a controller and adjusting means for inputting a desired value and/or desired variation for an operating parameter. The adjusting means include at least one variable input element, such as a potentiometer or a contactless encoder connectable to the controller.

<CIT> describes an oral irrigator that has a pump unit having at least a first pump being connected or being connectable to at least a first fluid reservoir containing a first fluid, a control unit for controlling the pump unit, at least a first outlet nozzle for emitting fluid pumped from the first fluid reservoir to the first outlet nozzle during operation as a continuous or pulsating fluid jet, wherein the control unit is arranged to control the pump unit during operation in at least a first operation mode such that at least a first fluid jet parameter of the continuous or pulsating jet is automatically varied over time.

<CIT> describes a dental irrigator comprising a rinsing head, a pump body assembly in communication with the rinsing head, a hose in communication with the pump body assembly, and a water tank in communication with the hose; the pump body assembly includes a pump, which is electrically connected to a motor and a battery is electrically connected to the motor; the pump body assembly and the hose are located in a casing, the rinsing head and the water tank are located outside the casing, and a switch adjustment button is provided on the casing, The switch adjustment button is connected with the pump body assembly.

<CIT> describes a water toothpick assembly and auxiliary equipment thereof. One end of a water toothpick is equipped with a spray nozzle, and the other end of the water toothpick is equipped with a spray nozzle base; the spray nozzle is connected with the spray nozzle base through a blocking part; the auxiliary equipment comprises a housing, a power supply and a water pump; the housing comprises a water receiving part which is positioned on the side surface of the shell and is used for connecting a water tube outside the shell; the water pump is placed in the shell for producing continuous high-pressure outlet water; and the power supply is fixedly connected with the water pump for charging the water pump. A water inlet is connected with the water pump through an internal water tube, and the water pump generates continuous high-pressure outlet water.

The present invention provides an oral irrigator as set out in claim <NUM>.

In an oral irrigator with a water volume stepless adjustment device of the invention, the water volume stepless adjustment device is disposed on the oral irrigator to realize stepless continuous adjustment of the water volume, so that a user can select the most comfortable water volume and water column impact force according to the own feeling in a using process.

The oral irrigator with a water volume stepless adjustment device of the invention is characterized in that: an oral irrigator <NUM> with a water volume stepless adjustment device includes a sprayer <NUM>, a spray lance <NUM>, a control switch <NUM>, a vessel <NUM>, a water pipe <NUM> and a water volume stepless adjustment device <NUM>;.

the sprayer <NUM> is disposed at a front end of the spray lance <NUM>; the control switch <NUM> is capable of controlling the spraying of a fluid in the spray lance <NUM>; a fluid in the vessel <NUM> is connected to the spray lance <NUM> through the water pipe <NUM>;.

the water volume stepless adjustment device <NUM> includes an adjusting switch <NUM>, a controller <NUM> and a signal output device <NUM>; a signal output by the controller <NUM> can be continuously adjusted by adjusting the adjusting switch <NUM> so as to continuously adjust the magnitude of pressure of the fluid sprayed from the spray lance <NUM>.

Because the adjusting switch <NUM> of the water volume stepless adjustment device <NUM> can continuously adjust the signal output by the controller <NUM>, the signal output by the output device <NUM> may be continuously changed, and the magnitude of the pressure of the fluid sprayed from the spray lance <NUM> can be continuously adjusted by continuously adjusting the output signal of the controller <NUM>. When a user uses the oral irrigator, the user can adjust water pressure according to personal tolerance and preferences until feel most comfortable, thereby greatly enhancing the cleaning effect and comfort of the oral irrigator in the using process.

The signal adjusted by the controller <NUM> is voltage, current, power, frequency, or waveform. Herein, the applicant only enumerates the above signals, but those skilled in the art can adjust other signals according to needs so as to adjust the magnitude of the pressure of the fluid without departing from the scope of protection of the present application.

The adjusting switch <NUM> is a knob type adjusting switch.

The adjusting switch <NUM> includes a knob <NUM>-<NUM> and a positioning hole <NUM>-<NUM>. The controller <NUM> includes a potentiometer <NUM>-<NUM> and a control chip <NUM>-<NUM>, an output signal of the potentiometer <NUM>-<NUM> is an input signal of the control chip <NUM>-<NUM>, and an output signal of the control chip <NUM>-<NUM> can be controlled. The potentiometer <NUM>-<NUM> is provided with a connecting rod <NUM>-<NUM>-<NUM>, and the connecting rod <NUM>-<NUM>-<NUM> can be embedded in the positioning hole <NUM>-<NUM>. The knob <NUM>-<NUM> can be rotated to drive the connecting rod <NUM>-<NUM>-<NUM> to rotate to adjust the magnitude of the output signal of the potentiometer <NUM>-<NUM>, thereby adjusting the output signal of the control chip <NUM>-<NUM>.

The knob type adjusting switch can continuously adjust the output signal, such as a voltage signal, of the potentiometer <NUM>-<NUM> by rotating the knob <NUM>-<NUM>, the output signal, such as the voltage signal, of the potentiometer <NUM>-<NUM> is the input signal of the control chip <NUM>-<NUM>, and the output signal, such as the magnitude of the output voltage, the magnitude of the current, the magnitude of the power, the magnitude of the frequency or the pulse waveform, of the control chip <NUM>-<NUM> can be continuously adjusted by adjusting the input signal of the control chip <NUM>-<NUM>. The signal output by the control chip <NUM>-<NUM> can control the magnitude of pressure of water sucked by the water suction device <NUM> or the magnitude of pressure applied by the pressurizing device <NUM>-<NUM> to the fluid in the pressure vessel <NUM>. The pressure of the fluid sprayed from the sprayer <NUM> can be continuously adjusted by continuously adjusting the signal output by the control chip <NUM>-<NUM>. The knob type adjusting switch only needs to rotate the knob <NUM>-<NUM> back and forth to realize signal adjustment of the controller <NUM>, so that the use is simple and convenient.

In an example outside the scope of the present invention, but included as useful for understanding the invention, the adjusting switch <NUM> is a slide groove type adjusting switch.

The adjusting switch <NUM> according to the example outside the scope of the present invention includes a handle <NUM>-<NUM> and a slide block <NUM>-<NUM>. The potentiometer <NUM>-<NUM> is provided with a slide groove <NUM>-<NUM>-<NUM>. The slide block <NUM>-<NUM> is embedded in the slide groove <NUM>-<NUM>-<NUM>. The handle <NUM>-<NUM> is pushed back and forth to enable the slide block <NUM>-<NUM> to move back and forth in the slide groove <NUM>-<NUM>-<NUM> to adjust the magnitude of the output signal of the potentiometer <NUM>-<NUM>, thereby adjusting the output signal of the control chip <NUM>-<NUM>.

By embedding the slide block <NUM>-<NUM> in the slide groove <NUM>-<NUM>-<NUM>, the slide groove type adjusting switch only needs to push the handle <NUM>-<NUM> back and forth to realize signal adjustment of the controller <NUM>, so that the operation is very convenient.

Herein, the applicant enumerates a knob type adjusting mode according to the scope of protection of the present invention. The slide groove type adjusting mode is provided as an example outside the scope of the present invention.

The oral irrigator <NUM> includes a water suction device <NUM>. The water suction device <NUM> is capable of sucking the fluid in the vessel <NUM> into the spray lance <NUM> through the water pipe <NUM>, and then, the fluid is sprayed from the sprayer <NUM>.

The water suction device <NUM> is a manual water suction device or an electric water suction device <NUM>.

Further, the water suction device <NUM> is an electric water suction device <NUM>. The electric water suction device <NUM> includes a water inlet pipe <NUM>-<NUM>, a motor <NUM>-<NUM> and a water outlet pipe <NUM>-<NUM>. The motor <NUM>-<NUM> works, the fluid in the vessel <NUM> is sucked into the electric water suction device <NUM> through the water pipe <NUM> and then sprayed from the water outlet pipe <NUM>-<NUM>, and the sprayed fluid passes through the water pipe <NUM> and is then sprayed from the spray lance <NUM>.

The oral irrigator with a water volume stepless adjustment device of the invention also includes a power source <NUM> and a circuit system <NUM>. The power source <NUM>, the electric water suction device <NUM>, the water volume stepless adjustment device <NUM> and the control switch <NUM> are connected together through the circuit system <NUM>.

After the output signal of the controller <NUM> of the water volume stepless adjustment device <NUM> is output by the signal output device <NUM>, a rotation speed of the motor <NUM>-<NUM> can be controlled, and the rotation speed of the motor <NUM>-<NUM> can be adjusted by adjusting the output signal of the controller <NUM>, thereby adjusting the magnitude of the pressure of the fluid sprayed from the sprayer <NUM>.

The vessel <NUM> is detachably mounted at a proximal end of the oral irrigator <NUM>. By virtue of a detachable connection mode, the vessel <NUM> can be conveniently detached and then cleaned, so that the vessel <NUM> is more sanitary and safe for long-term use.

During use, the control switch <NUM> is turned on, the motor <NUM>-<NUM> of the electric water suction device <NUM> works, the fluid in the vessel <NUM> is sucked into the electric water suction device <NUM> through the water pipe <NUM> and then sprayed from the water outlet pipe <NUM>-<NUM>, and the sprayed fluid enters the spray lance <NUM> through the water pipe <NUM> and is finally sprayed from the sprayer <NUM> of the spray lance <NUM>. The knob <NUM>-<NUM> is rotated or the handle <NUM>-<NUM> is pushed back and forth to continuously adjust the magnitude of the pressure of the sprayed fluid, an appropriate water pressure is selected according to personal preferences and cleaning effects, and then, the sprayer <NUM> is aligned to a part to be cleaned so as to clean the teeth and the oral cavity.

The vessel <NUM> is a pressure vessel <NUM>. The pressure vessel <NUM> includes a pressurizing device <NUM>-<NUM>, a housing <NUM>-<NUM> and a fluid containing space <NUM>-<NUM>. The pressurizing device <NUM>-<NUM> capable of increasing the pressure of the fluid is mounted on the housing <NUM>-<NUM>.

The vessel <NUM> may also be a pressure vessel <NUM>. The pressurizing device <NUM>-<NUM> of the pressure vessel <NUM> may be an electric pressurizing device <NUM>-<NUM>. The electric pressurizing device <NUM>-<NUM> can increase the pressure of a fluid in the fluid containing space <NUM>-<NUM>, so that the fluid in the fluid containing space <NUM>-<NUM> is pressed into the water pipe <NUM> from the fluid containing space <NUM>-<NUM> under the action of the external pressure, and then is sprayed from the sprayer of the spray lance <NUM>. The controller <NUM> of the water volume stepless adjustment device <NUM> can control the magnitude of the pressure applied by the electric pressurizing device <NUM>-<NUM> to the fluid in the fluid containing space <NUM>-<NUM> through the signal output by the output device <NUM>, and the magnitude of the pressure of the fluid sprayed from the spray lance <NUM> can be controlled by continuously adjusting the magnitude of the applied pressure.

During use, the control switch <NUM> is turned on, the electric pressurizing device <NUM>-<NUM> works, the fluid in the fluid containing space <NUM>-<NUM> is pressurized, and under the action of the pressure, the fluid in the fluid containing space <NUM>-<NUM> is pressed into the spray lance <NUM> through the water pipe <NUM> and is finally sprayed from the sprayer. The knob <NUM>-<NUM> is rotated or the handle <NUM>-<NUM> is pushed back and forth to adjust the magnitude of the pressure of the sprayed fluid, an appropriate water pressure is selected according to personal preferences and cleaning effects, and then, the sprayer <NUM> is aligned to the part to be cleaned so as to clean the teeth and the oral cavity.

The oral irrigator <NUM> can be connected to the oral observation instrument <NUM> through the connecting mechanism <NUM>. The oral irrigator of the invention can also be connected to the oral observation instrument <NUM> through the connecting mechanism <NUM>, and the sprayer <NUM> of the spray lance <NUM> is within the field of view of the observation system <NUM> of the oral observation instrument <NUM>, so that under direct vision, the water volume is adjusted, the teeth and the oral cavity are cleaned, and the cleaning process can be shot and photographed.

The oral irrigator with a water volume stepless adjustment device of the invention includes a sprayer <NUM>, a spray lance <NUM>, a control switch <NUM>, a vessel <NUM>, a water pipe <NUM> and a water volume stepless adjustment device <NUM>. The water volume stepless adjustment device <NUM> includes an adjusting switch <NUM>, a controller <NUM> and a signal output device <NUM>. The signal output by the controller <NUM> can be continuously adjusted by adjusting the adjusting switch <NUM> so as to continuously adjust the magnitude of the pressure of the fluid sprayed from the spray lance <NUM>. When a user uses the oral irrigator with a water volume stepless adjustment device of the invention, the user can adjust the water pressure according to personal tolerance and preferences until feel most comfortable, thereby greatly enhancing the cleaning effect and comfort of the oral irrigator in the using process. The oral irrigator with a water volume stepless adjustment device of the invention can also be connected to the oral observation instrument <NUM>, so that under direct vision, the water volume is adjusted, the teeth and the oral cavity are cleaned, and the cleaning process can be shot and photographed.

Referring to <FIG>, an oral irrigator with a water volume stepless adjustment device of the present embodiment includes a sprayer <NUM>, a spray lance <NUM>, a control switch <NUM>, a vessel <NUM>, a water pipe <NUM>, a water volume stepless adjustment device <NUM> and a water suction device <NUM>.

The sprayer <NUM> is disposed at a front end of the spray lance <NUM>. The control switch <NUM> is capable of controlling the spraying of a fluid in the spray lance <NUM>. A fluid in the vessel <NUM> is connected to the spray lance <NUM> through the water pipe <NUM>.

The water volume stepless adjustment device <NUM> includes an adjusting switch <NUM>, a controller <NUM> and a signal output device <NUM>. A signal output by the controller <NUM> can be continuously adjusted by adjusting the adjusting switch <NUM> so as to continuously adjust the magnitude of the pressure of the fluid sprayed from the spray lance <NUM>.

In the present embodiment, the adjusting switch <NUM> is a knob type adjusting switch.

In the present embodiment, the water suction device <NUM> is an electric water suction device <NUM>. The electric water suction device <NUM> includes a water inlet pipe <NUM>-<NUM>, a motor <NUM>-<NUM> and a water outlet pipe <NUM>-<NUM>. The motor <NUM>-<NUM> works, the fluid in the vessel <NUM> is sucked into the electric water suction device <NUM> through the water pipe <NUM> and then sprayed from the water outlet pipe <NUM>-<NUM>, and the sprayed fluid passes through the water pipe <NUM> and is then sprayed from the spray lance <NUM>.

In the present embodiment, the knob <NUM>-<NUM> can be rotated to drive the connecting rod <NUM>-<NUM>-<NUM> to rotate to adjust an output voltage of the potentiometer <NUM>-<NUM>, and the output voltage of the potentiometer <NUM>-<NUM> is an input voltage of the control chip <NUM>-<NUM>. With the change of the input voltage, a pulse waveform output by the control chip <NUM>-<NUM> is also changed. A rotation speed of the motor <NUM>-<NUM> of the electric water suction device <NUM> can be adjusted according to the change of the pulse waveform to adjust a water suction speed of the electric water suction device <NUM>, thereby achieving the purpose of adjusting the flow rate and pressure of the fluid sprayed from the spray lance <NUM>.

The output signal of the potentiometer <NUM>-<NUM> may also be other electric signals, such as current, power, frequency or waveform. The output signal of the potentiometer <NUM>-<NUM> is the input signal of the control chip <NUM>-<NUM>. The output signal of the control chip <NUM>-<NUM> may also be voltage, current, power, frequency or other control signals in addition to the pulse waveform signal described in the present embodiment, without departing from the scope of protection of the present application.

In the present embodiment, the rotation speed of the motor <NUM>-<NUM> is controlled by the output signal of the control chip <NUM>-<NUM> to adjust the water suction speed of the electric water suction device <NUM>, thereby adjusting the flow rate and pressure of the fluid sprayed from the spray lance <NUM>. Those skilled in the art can also design other control modes according to actual requirements, such as controlling the degree of vacuum of the water suction device <NUM> to control the water suction speed of the electric water suction device <NUM>, without departing from the scope of protection of the present application.

In the present embodiment, the vessel <NUM> is detachably mounted at a proximal end of the oral irrigator <NUM>. By virtue of a detachable connection mode, the vessel <NUM> can be conveniently detached and then cleaned, so that the vessel <NUM> is more sanitary and safe for long-term use.

During use, the control switch <NUM> is turned on, the motor <NUM>-<NUM> of the electric water suction device <NUM> works, the fluid in the vessel <NUM> is sucked into the electric water suction device <NUM> through the water pipe <NUM> and then sprayed from the water outlet pipe <NUM>-<NUM>, and the sprayed fluid enters the spray lance <NUM> through the water pipe <NUM> and is finally sprayed from the sprayer <NUM> of the spray lance <NUM>. The knob <NUM>-<NUM> is rotated or the handle <NUM>-<NUM> is pushed back and forth to adjust the magnitude of the pressure of the sprayed fluid, an appropriate water pressure is selected according to personal preferences and cleaning effects, and then, the sprayer <NUM> is aligned to the part to be cleaned so as to clean the teeth and the oral cavity.

The knob type adjusting switch only needs to rotate the knob <NUM>-<NUM> back and forth to realize continuous adjustment of the signal of the controller <NUM>, so that the use is simple and convenient.

The oral irrigator with a water volume stepless adjustment device of the present embodiment can continuously adjust the magnitude of the pressure of the fluid sprayed from the spray lance <NUM>. When a user uses the oral irrigator with a water volume stepless adjustment device of the present embodiment, the user can adjust the water pressure according to personal tolerance and preferences until feel most comfortable, thereby greatly enhancing the cleaning effect and comfort of the oral irrigator in the using process.

Referring to <FIG>, the difference between the present example and Embodiment <NUM> lies in that in the present example, the adjusting switch <NUM>-<NUM> of the oral irrigator <NUM> is a slide groove type adjusting switch. The arrangement of the present example is outside the scope of the present invention but is included as useful for understanding the invention.

The adjusting switch <NUM> is a slide groove type adjusting switch.

In the present example, the adjusting switch <NUM> includes a handle <NUM>-<NUM> and a slide block <NUM>-<NUM>, the potentiometer <NUM>-<NUM> is provided with a slide groove <NUM>-<NUM>-<NUM>, and the slide block <NUM>-<NUM> is embedded in the slide groove <NUM>-<NUM>-<NUM>.

The handle <NUM>-<NUM> is pushed back and forth to enable the slide block <NUM>-<NUM> to move back and forth in the slide groove <NUM>-<NUM>-<NUM> to adjust the magnitude of the output signal of the potentiometer <NUM>-<NUM>, the output signal of the potentiometer <NUM>-<NUM> is the input signal of the control chip <NUM>-<NUM>, and the output signal of the control chip <NUM>-<NUM> can be adjusted by adjusting the output signal of the control chip <NUM>-<NUM> to adjust the water suction speed of the electric water suction device <NUM>, thereby achieving the purpose of adjusting the flow rate and pressure of the fluid sprayed from the spray lance <NUM>.

By embedding the slide block <NUM>-<NUM> in the slide groove <NUM>-<NUM>-<NUM>, signal adjustment of the controller <NUM> can be realized by just pushing the handle <NUM>-<NUM> back and forth, so that the operation is very convenient and smooth.

Referring to <FIG>, the difference between the present embodiment and Embodiment <NUM> lies in that: in the present embodiment, the vessel <NUM> is a pressure vessel <NUM>.

The pressure vessel <NUM> includes a pressurizing device <NUM>-<NUM>, a housing <NUM>-<NUM> and a fluid containing space <NUM>-<NUM>. The pressurizing device <NUM>-<NUM> capable of increasing the pressure of the fluid is mounted on the housing <NUM>-<NUM>.

In the present embodiment, the pressurizing device <NUM>-<NUM> of the pressure vessel <NUM> is an electric pressurizing device <NUM>-<NUM>. The electric pressurizing device <NUM>-<NUM> can increase the pressure of the fluid in the fluid containing space <NUM>-<NUM>, so that the fluid in the fluid containing space <NUM>-<NUM> is pressed into the water pipe <NUM> from the fluid containing space <NUM>-<NUM> under the action of the pressure, and then is sprayed from the sprayer of the spray lance <NUM>.

In the present embodiment, the electric pressurizing device <NUM>-<NUM> is an air compressor. The electric pressurizing device <NUM>-<NUM> includes an air inlet pipe <NUM>-<NUM>-<NUM>, a compressor <NUM>-<NUM>-<NUM> and an air outlet pipe <NUM>-<NUM>-<NUM>. During working, the compressor <NUM>-<NUM>-<NUM> operates, the air sucked from the air inlet pipe <NUM>-<NUM>-<NUM> is pressurized, and then, the fluid in the fluid containing space <NUM>-<NUM> is pressurized from the air outlet pipe <NUM>-<NUM>-<NUM> disposed above the fluid.

The controller <NUM> of the water volume stepless adjustment device <NUM> can control the magnitude of the pressure applied by the compressor <NUM>-<NUM>-<NUM> to the fluid in the fluid containing space <NUM>-<NUM> through the signal output by the output device <NUM>, and the magnitude of the pressure of the fluid sprayed from the spray lance <NUM> can be controlled by continuously adjusting the magnitude of the applied pressure.

In the present embodiment, the electric pressurizing device <NUM>-<NUM> may also be pressurizing devices of other forms, such as a submersible pump. The fluid in the fluid containing space <NUM>-<NUM> is pressurized and then sprayed from the spray lance <NUM>. Regardless of the form of the pressurizing device, it does not depart from the scope of protection of the present application.

Referring to <FIG>, the difference between the present embodiment and Embodiment <NUM> lies in that: in the present embodiment, the oral irrigator <NUM> with a water volume stepless adjustment device can be connected to the oral observation instrument <NUM> through the connecting mechanism <NUM> so as to clean the teeth and the oral cavity under direct vision.

During use, the observation system <NUM> of the oral observation instrument <NUM> is started, the control switch <NUM> is turned on, the motor <NUM>-<NUM> of the electric water suction device <NUM> works, the fluid in the vessel <NUM> is sucked into the electric water suction device <NUM> through the water pipe <NUM> and then sprayed from the water outlet pipe <NUM>-<NUM>, and the sprayed fluid enters the spray lance <NUM> through the water pipe <NUM> and is finally sprayed from the sprayer <NUM> of the spray lance <NUM>. After the pressure of the fluid is lowered, the sprayer <NUM> is aligned to the teeth or the interdental space needing to be cleaned, under direct vision, the adjusting switch <NUM> is adjusted to adjust the magnitude of the flow rate and speed of the fluid sprayed from the sprayer <NUM> until reaching a good cleaning effect and a high comfort degree, and then, the teeth and the oral cavity are cleaned under direct vision.

In the present embodiment, the sprayer <NUM> of the spray lance <NUM> is within the field of view of the observation system <NUM> of the oral observation instrument <NUM>. Under the direct vision, the magnitude and speed of the fluid sprayed from the sprayer <NUM> can be observed in real time, thereby adjusting the water volume. Furthermore, under direct vision, the teeth and the oral cavity are cleaned, and the cleaning process can also be shot and photographed, so that the using process is safer and more reliable.

Claim 1:
A handheld oral irrigator (<NUM>), comprising a sprayer (<NUM>), a spray lance (<NUM>), a control switch (<NUM>), a vessel (<NUM>), a water pipe (<NUM>) and a water volume stepless adjustment device (<NUM>), all of which are disposed on the handheld oral irrigator (<NUM>), wherein:
the sprayer (<NUM>) is disposed at a front end of the spray lance (<NUM>);
the control switch (<NUM>) is capable of controlling the spraying of a fluid in the spray lance (<NUM>);
the vessel (<NUM>) is detachably mounted at a proximal end of the handheld oral irrigator (<NUM>); and a fluid in the vessel (<NUM>) is connected to the spray lance (<NUM>) through the water pipe (<NUM>);
the water volume stepless adjustment device (<NUM>) comprises:
a knob type adjusting switch (<NUM>);
a controller (<NUM>); and
a signal output device (<NUM>);
wherein a signal output by the controller (<NUM>) can be continuously adjusted by adjusting the adjusting switch (<NUM>) so as to continuously adjust the magnitude of pressure of the fluid sprayed from the spray lance (<NUM>);
wherein the adjusting switch (<NUM>) comprises a knob (<NUM>-<NUM>) and a positioning hole (<NUM>-<NUM>);
the controller (<NUM>) comprises a potentiometer (<NUM>-<NUM>) and a control chip (<NUM>-<NUM>), and an output signal of the control chip (<NUM>-<NUM>) can be controlled;
the potentiometer (<NUM>-<NUM>) is provided with a connecting rod (<NUM>-<NUM>-<NUM>), and the connected rod can be embedded in the positioning hole (<NUM>-<NUM>); the knob (<NUM>-<NUM>) can be rotated to drive the connecting rod (<NUM>-<NUM>-<NUM>) to rotate to adjust the magnitude of the output signal of the potentiometer (<NUM>-<NUM>), thereby adjusting the output signal of the control chip (<NUM>-<NUM>).