Manual water-jet needle with controllable penetration depth

Abstract

The utility model discloses a piercing-depth-controllable manual water injection needle which comprises an injector, a needle head and a sleeve assembly, and the needle head is connected to a liquid outlet nozzle of the injector in a pluggable mode. The sleeve assembly comprises a fixed sleeve, a sliding sleeve and an elastic piece, one end of the fixed sleeve is detachably connected to the needle head, the sliding sleeve is arranged on the fixed sleeve in a sleeving mode and can slide in the axial direction of the fixed sleeve, and the elastic piece is arranged between the sliding sleeve and the fixed sleeve and used for providing elastic acting force for forcing the sliding sleeve to move in the direction away from the liquid outlet nozzle; the needle head penetrates into the fixing sleeve and then extends into the sliding sleeve, and when the sliding sleeve abuts against the body surface of the human body and is subjected to body surface pressure, the sliding sleeve slides in the direction close to the liquid outlet nozzle, so that the needle head extends out of the sliding sleeve and penetrates into the body surface of the human body. According to the manual water injection needle, the depth of the needle head penetrating into the skin can be accurately controlled, excessive penetration is effectively prevented, the dependence on the personal skill of doctors is reduced, and the injection process is simpler and more efficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection device especially relates to a kind of hand-operated water-light needle of controllable penetration depth. BACKGROUND

[0002] Water-light needle is a kind of beauty therapy that nutrient is directly delivered to dermis by injection method.And water-light needle injection usually has two injection methods of hand-operated water-light needle and machine-operated water-light needle.

[0003] Hand-operated water-light needle has higher technical requirement to doctor, and injection level and dosage need to be accurately mastered.Hand-operated water-light needle can flexibly adjust injection angle and depth, and it is especially suitable for processing facial undulation or special area.Machine-operated water-light needle uses multiple needles to simultaneously inject by the power generated by machine, and it can accurately adjust injection dosage, and operation speed is faster, so it is suitable for routine maintenance and water replenishment.

[0004] For hand-operated injection method, penetration depth of needle is completely controlled by doctor's experience and skill, so it is difficult, and it can cause problems such as penetrating nerve layer due to penetration too deep, and injection efficiency of this method is relatively low. SUMMARY

[0005] The utility model aims at at least one of the technical problems in the related art to some extent.For this purpose, the utility model provides a kind of hand-operated water-light needle of controllable penetration depth.

[0006] To achieve the above-mentioned purpose, according to the hand-operated water-light needle of controllable penetration depth of the utility model embodiment, it includes:

[0007] Injector;

[0008] Needle, the needle is pluggable connection in the liquid outlet of the injector;

[0009] Sleeve assembly, the sleeve assembly includes fixed sleeve, sliding sleeve and elastic element, one end of the fixed sleeve is detachably connected on the needle, the sliding sleeve is sleeved on the fixed sleeve and can slide along the axial direction of the fixed sleeve, and the elastic element is arranged between the sliding sleeve and the fixed sleeve to provide elastic force to force the sliding sleeve to move away from the liquid outlet;

[0010] Wherein, the needle extends into the sliding sleeve after penetrating from the fixed sleeve, when the sliding sleeve abuts against human body surface and is subjected to surface pressure, the sliding sleeve slides towards the liquid outlet, so that the needle extends from the sliding sleeve and penetrates into human body surface.

[0011] According to the hand-operated water-light needle with controllable penetration depth provided in the embodiment of the utility model, the sleeve assembly is configured, when the sliding sleeve contacts with the human body surface, it will slide to the syringe direction under the body surface pressure, and meanwhile, the internal elastic member is compressed. This process accurately controls the depth of the needle head extending from the sliding sleeve and penetrating into the skin, and effectively prevents over-penetration. The resilience provided by the elastic member ensures that the needle head can automatically retract after injection is completed, so that continuous injection can be realized. This method of mechanically controlling the penetration depth greatly reduces the dependence on the personal skills of the doctor, makes the injection process more standardized and accurate, while maintaining the flexibility advantage of the hand-operated mode, improves the safety and accuracy of injection, and also improves the injection efficiency, provides a more reliable and efficient hand-operated water-light needle injection mode for the doctor, and significantly improves the quality of beauty and patient experience.

[0012] In addition, the hand-operated water-light needle with controllable penetration depth according to the above-mentioned embodiment of the utility model can also have the following additional technical features:

[0013] According to one embodiment of the utility model, the needle head comprises a needle head seat and a needle tube, the needle head seat is suitable for being detachably connected with the liquid outlet nozzle, and the needle tube is connected to the needle head seat.

[0014] The fixing sleeve comprises a joint part and a cylinder part, the joint part is detachably connected with the needle head seat, one end of the cylinder part is fixed with the joint part, the other end of the cylinder part extends along the axial direction of the needle tube, the needle tube penetrates through the cylinder part, and the sliding sleeve is slidably arranged on the cylinder part.

[0015] According to one embodiment of the utility model, the elastic member is a compression spring, the compression spring is sleeved on the cylinder part, one end of the compression spring abuts against the joint part, and the other end of the compression spring abuts against one end of the sliding sleeve adjacent to the liquid outlet nozzle.

[0016] According to one embodiment of the utility model, the peripheral wall of the sliding sleeve is provided with at least two sliding grooves, the two sliding grooves are arranged in a spaced manner along the circumferential direction of the sliding sleeve, and each sliding groove extends along the axial direction of the sliding sleeve.

[0017] The outer peripheral surface of the cylinder part is provided with at least two sliding protrusions, the at least two sliding protrusions correspond to the at least two sliding grooves one by one, and each sliding protrusion is in sliding cooperation with the corresponding sliding groove.

[0018] According to one embodiment of the utility model, the peripheral wall of the cylinder part is provided with a plurality of cutting grooves, an elastic strip is defined between adjacent two cutting grooves, and one end of each cutting groove penetrates through one end of the cylinder part away from the liquid outlet nozzle.

[0019] The sliding protrusions correspond to the elastic strips one by one, and each sliding protrusion is arranged on the corresponding elastic strip.

[0020] According to an embodiment of the present application, a guide inclined surface is arranged on the sliding protrusion at an end axially away from the liquid outlet nozzle of the cylindrical portion, to guide the elastic strip to deform inwardly, so that the sliding protrusion is inserted into the sliding groove.

[0021] According to an embodiment of the present application, the sleeve assembly further comprises an adjusting head, the adjusting head has a through hole for the needle tube to extend out;

[0022] The adjusting head is threadedly connected to an end of the sliding sleeve axially away from the liquid outlet nozzle, and the adjusting head can change its position in the axial direction of the sliding sleeve by screwing.

[0023] According to an embodiment of the present application, a soft rubber pad is arranged on an end of the adjusting head axially away from the sliding sleeve.

[0024] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor.

[0026] Fig. 1 is a structure schematic diagram of the hand-operated water-light needle with controllable penetration depth according to an embodiment of the present application;

[0027] Fig. 2 is a sectional view of the hand-operated water-light needle with controllable penetration depth according to an embodiment of the present application;

[0028] Fig. 3 is an exploded view of the hand-operated water-light needle with controllable penetration depth according to an embodiment of the present application;

[0029] Fig. 4 is a detailed exploded view of the hand-operated water-light needle with controllable penetration depth according to an embodiment of the present application.

[0030] Reference signs:

[0031] 10, syringe;

[0032] 101, liquid outlet nozzle;

[0033] 20, needle;

[0034] 201, needle seat;

[0035] 202, needle tube;

[0036] 30, sleeve assembly;

[0037] 301, fixed sleeve;

[0038] 3011, joint part;

[0039] 3012, cylindrical part;

[0040] 3013, elastic strip;

[0041] 3014, sliding protrusion;

[0042] 302, sliding sleeve;

[0043] H302, sliding groove;

[0044] 303, elastic member;

[0045] 304, adjusting head.

[0046] The realization, functional features and advantages of the utility model will be further described with reference to the drawings combined with embodiments. DETAILED DESCRIPTION

[0047] The embodiments of the utility model will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0048] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms 'center', 'longitudinal', 'transverse', 'length', 'width', 'thickness', 'upper', 'lower', 'front','rear', 'left', 'right','vertical', 'horizontal', 'top', 'bottom', 'inner', 'outer', 'clockwise', 'counterclockwise', 'axial', 'circumferential', 'radial' is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the utility model.

[0049] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or any priority. Thus, a feature defined with "first", "second", etc. can include one or more of the features implicitly or explicitly.

[0050] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include the direct contact between the first and second features, or the indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0052] The depth of the embodiment of the present application is described in detail below.

[0053] Referring to Figs. 1 to 4 As shown in the drawings, the depth of the embodiment of the present application is described in detail below.

[0054] Specifically, the syringe 10 is used to store and push the injection liquid. For example, in facial beauty, the injection liquid can be hyaluronic acid, botulinum toxin and other cosmetic substances.

[0055] The needle 20 is plug-in connected to the liquid outlet 101 of the syringe 10. By using the needle 20, the dermis layer of the face can be pierced, and then the injection liquid can be pushed by the syringe 10, so that the cosmetic substance can be injected into the dermis layer of the face.

[0056] The sleeve assembly 30 comprises a fixed sleeve 301, a sliding sleeve 302 and an elastic member 303. One end of the fixed sleeve 301 is detachably connected to the needle 20. For example, the fixed sleeve 301 can be connected to the needle 20 by means of plug-in connection, threaded connection, snap connection, etc. to facilitate assembly between the fixed sleeve 301 and the needle 20.

[0057] The sliding sleeve 302 is sleeved on the fixed sleeve 301 and is axially slidable along the fixed sleeve 301. This sliding design is used to control the penetration depth of the needle 20. When the sliding sleeve 302 slides backward, the needle 20 is exposed. The greater the distance that the sliding sleeve 302 slides backward, the greater the length of the needle 20 that is exposed, and the greater the penetration depth.

[0058] The elastic member 303 is arranged between the sliding sleeve 302 and the fixed sleeve 301 to provide an elastic force that urges the sliding sleeve 302 to move away from the liquid outlet 101. The elastic force ensures that the needle 20 is completely hidden in the sliding sleeve 302 in the non-use state, thereby improving safety and hygiene.

[0059] The needle 20 extends into the sliding sleeve 302 from the fixed sleeve 301. When the sliding sleeve 302 abuts against the body surface and is subjected to pressure from the body surface, the sliding sleeve 302 slides toward the liquid outlet 101, so that the needle 20 extends out of the sliding sleeve 302 and penetrates into the body surface.

[0060] When in use, the fixed sleeve 301 is connected to the needle 20, and the needle 20 extends into the sliding sleeve 302 from the fixed sleeve 301. The operator abuts the front end (the end away from the liquid outlet 101) of the sliding sleeve 302 against the body surface, and the body surface exerts pressure on the sliding sleeve 302. Under this pressure, the sliding sleeve 302 slides toward the liquid outlet 101 (i.e., slides backward) and compresses the elastic member 303. This process causes the needle 20 to extend out of the sliding sleeve 302 and penetrate into the body surface. Since the sliding distance of the sliding sleeve 302 is limited, the penetration depth of the needle 20 can be accurately controlled, and excessive penetration can be effectively prevented.

[0061] According to the hand-operated water-light needle with controllable penetration depth provided in the embodiments of the utility model, the sleeve assembly 30 is configured, when the sliding sleeve 302 contacts with the human body surface, it will slide to the syringe 10 direction under the surface pressure, and the internal elastic member 303 is compressed. This process accurately controls the depth of the needle 20 extending from the sliding sleeve 302 and penetrating into the skin, and effectively prevents over-penetration. The elastic member 303 provides a rebound force to ensure that the needle 20 can automatically retract after injection is completed, so that continuous injection can be realized. This method of mechanically controlling the penetration depth greatly reduces the dependence on the personal skills of the doctor, makes the injection process more standardized and accurate, while maintaining the flexibility advantage of the hand-operated mode, improves the safety and accuracy of injection, also improves the injection efficiency, provides a more reliable and efficient hand-operated water-light needle injection mode for the doctor, significantly improves the quality of beauty and patient experience.

[0062] In some embodiments of the utility model, the needle 20 includes a needle seat 201 and a needle tube 202, the needle seat 201 is suitable for being plug- connectable with the liquid outlet nozzle 101, and the needle tube 202 is connected to the needle seat 201.

[0063] The fixing sleeve 301 includes a joint part 3011 and a cylinder part 3012, the joint part 3011 is detachably connected with the needle seat 201, one end of the cylinder part 3012 is fixed with the joint part 3011, the other end of the cylinder part 3012 extends along the axial direction of the needle tube 202, the needle tube 202 passes through the cylinder part 3012, and the sliding sleeve 302 is slidably arranged on the cylinder part 3012.

[0064] In the embodiment, the fixing sleeve 301 mainly includes two parts of the joint part 3011 and the cylinder part 3012. The joint part 3011 is used for being detachably connected with the needle seat 201, so that the stability of the connection between the fixing sleeve 301 and the needle 20 and the convenience of disassembly are guaranteed. Preferably, the joint part 3011 can be a hollow structure and can be sleeved on the needle 20 to realize plug-connection. One end of the cylinder part 3012 is fixedly connected with the joint part 3011 to form an integral structure, and preferably, the cylinder part 3012 and the joint part 3011 are an integral forming structure. The other end of the cylinder part 3012 extends along the axial direction of the needle tube 202, and this design ensures that the needle tube 202 can pass through the fixing sleeve 301 in parallel, and meanwhile, the needle tube 202 can move linearly in the fixing sleeve 301 during use.

[0065] The needle tube 202 extends into the sliding sleeve 302 after passing through the cylindrical portion 3012. The sliding sleeve 302 can slide on the cylindrical portion 3012, so that when the sliding sleeve 302 is pressed, it can slide along the outer surface of the cylindrical portion 3012, thereby changing the exposed length of the needle tube 202 and controlling the penetration depth of the needle tube 202.

[0066] With the above structure, the overall function of the device is ensured, and the matching precision between the components is improved. The detachable connection of the joint portion 3011 and the needle seat 201 makes the entire device modularized, facilitating assembly. The cylindrical portion 3012 facilitates connection with the sliding sleeve 302, ensuring stable sliding of the sliding sleeve 302, and thereby ensuring the safety and reliability of the injection process.

[0067] Preferably, the elastic member 303 is a compression spring, which is sleeved on the cylindrical portion 3012, and one end of the compression spring abuts against the joint portion 3011, and the other end of the compression spring abuts against one end of the sliding sleeve 302 adjacent to the liquid outlet nozzle 101. In this way, during use, when the force acting on the sliding sleeve 302 is removed, the compression spring restores the elastic deformation and pushes the sliding sleeve 302 to quickly reset, that is, it ensures that the sliding sleeve 302 can automatically return to the initial position after one injection, and the elastic reset capability is stable and reliable.

[0068] In an embodiment of the present application, the peripheral wall of the sliding sleeve 302 is provided with at least two sliding grooves H302, and the two sliding grooves H302 are arranged in a circumferential direction of the sliding sleeve 302 and extend in an axial direction of the sliding sleeve 302.

[0069] The outer periphery of the cylindrical portion 3012 is provided with at least two sliding protrusions 3014, and the at least two sliding protrusions 3014 correspond to the at least two sliding grooves H302 one by one, and each sliding protrusion 3014 is in sliding cooperation with the corresponding sliding groove H302.

[0070] In the present embodiment, the sliding grooves H302 are arranged on the peripheral wall of the sliding sleeve 302, and the sliding protrusions 3014 are arranged on the outer periphery of the cylindrical portion 3012, and the sliding protrusions 3014 and the sliding grooves H302 are in sliding cooperation, realizing the guiding and limiting effect of the sliding sleeve 302 in the axial sliding. In this way, the linearity and stability of the sliding of the sliding sleeve 302 are significantly improved, thereby ensuring the reliability of the injection. In addition, the cooperation and limiting of the sliding protrusions 3014 and the sliding grooves H302 also provide better tactile feedback for the operator, and in the use process, the operator can feel the position of the sliding protrusions 3014 at both ends of the sliding grooves H302, which helps to accurately control the penetration depth and pressure. Further, the structure is simple and convenient to assemble.

[0071] In one embodiment of the present application, the peripheral wall of the cylindrical portion 3012 is provided with a plurality of cut grooves, and an elastic strip 3013 is defined between two adjacent cut grooves. One end of each cut groove penetrates through the end of the cylindrical portion 3012 away from the liquid outlet nozzle 101. A sliding protrusion 3014 corresponds to each elastic strip 3013, and each sliding protrusion 3014 is arranged on the corresponding elastic strip 3013.

[0072] That is, the peripheral wall of the cylindrical portion 3012 is formed with an elastic strip 3013 capable of deforming, which can deform radially inward. The sliding protrusion 3014 is arranged on the elastic strip 3013. During assembly, the cylindrical portion 3012 can be aligned with the sliding sleeve 302 and inserted axially. During insertion, the sliding protrusion 3014 is pressed inward by the peripheral wall of the sliding sleeve 302, thereby forcing the elastic strip 3013 to deform inward and offset. Finally, the sliding protrusion 3014 can smoothly enter the sliding sleeve 302. With the continuous insertion of the cylindrical portion 3012, the sliding protrusion 3014 is opposite to the sliding groove H302, the elastic strip 3013 is elastically reset, and the sliding protrusion 3014 is forced to enter the sliding groove H302, thereby achieving a sliding fit.

[0073] The design of the elastic strip 3013 not only facilitates the assembly of the cylindrical portion 3012 and the sliding sleeve 302, but also enables the sliding protrusion 3014 to maintain a more closely sliding fit with the sliding groove H302 under the elastic action of the elastic strip 3013, thereby improving the reliability of sliding.

[0074] In one embodiment of the present application, a guide slope is arranged on the sliding protrusion 3014 away from the end of the cylindrical portion 3012 axially and away from the liquid outlet nozzle 101, so as to guide the elastic strip 3013 to deform inward, thereby enabling the sliding protrusion 3014 to be inserted into the sliding groove H302.

[0075] In this embodiment, the guide slope is arranged on the sliding protrusion 3014, and during the insertion of the cylindrical portion 3012 into the sliding sleeve 302, the guide slope contacts the inner edge of one end of the sliding sleeve 302. Through the guiding action of the guide slope, the cylindrical portion 3012 is more easily inserted into the sliding sleeve 302, thereby achieving rapid assembly between the cylindrical portion 3012 and the sliding sleeve 302.

[0076] In one embodiment of the present application, the sleeve assembly 30 further comprises an adjusting head 304, and the adjusting head 304 has a through hole for the needle tube 202 to extend out of.

[0077] The adjusting head 304 is threadedly connected to the sliding sleeve 302 at an end away from the liquid outlet nozzle 101, and the adjusting head 304 can change its position in the axial direction of the sliding sleeve 302 by screwing.

[0078] That is, a hollow adjusting head 304 is threadedly connected to the front end of the sliding sleeve 302, and the needle tube 202 can extend out of the adjusting head 304. By rotating the adjusting head 304, the adjusting head 304 moves in the axial direction of the sliding sleeve 302, thereby changing the distance between the end face of the adjusting head 304 and the sliding sleeve 302. The greater the distance between the adjusting head 304 and the sliding sleeve 302, the longer the overall length of the sliding sleeve 302 and the adjusting head 304, and the smaller the depth of the needle tube 202 extending and penetrating. Conversely, the smaller the distance between the adjusting head 304 and the sliding sleeve 302, the smaller the overall length of the sliding sleeve 302 and the adjusting head 304, and the greater the depth of the needle tube 202 extending and penetrating. In this way, the adjusting head 304 can adjust the depth of the needle tube 202 penetrating, thereby meeting different application requirements, making the use more flexible and convenient, and ensuring that the injection depth is more accurate and reliable.

[0079] Preferably, a soft rubber pad, such as a silicone pad, is arranged at the end of the adjusting head 304 away from the sliding sleeve 302. In this way, the adjusting head 304 has higher comfort when in contact with the human body surface.

[0080] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0081] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A hand-operated water jet needle with controllable penetration depth, characterized in that The injection device comprises: a syringe; a needle head, which is pluggably connected to a liquid outlet of the syringe; a sleeve assembly, which comprises a fixed sleeve, a sliding sleeve and an elastic member, one end of the fixed sleeve is detachably connected to the needle head, the sliding sleeve is sleeved on the fixed sleeve and is axially slidable along the fixed sleeve, and the elastic member is arranged between the sliding sleeve and the fixed sleeve to provide an elastic force for forcing the sliding sleeve to move away from the liquid outlet; wherein the needle head extends into the sliding sleeve after penetrating through the fixed sleeve, when the sliding sleeve abuts against a human body surface and is subjected to a surface pressure, the sliding sleeve slides towards the liquid outlet, so that the needle head extends out of the sliding sleeve and penetrates into the human body surface.

2. The depth of penetration controllable hand-held water jet needle according to claim 1, characterized in that, The needle head comprises a needle head seat and a needle tube, the needle head seat is adapted to be pluggably connected to the liquid outlet, and the needle tube is connected to the needle head seat; the fixed sleeve comprises a joint portion and a cylinder portion, the joint portion is detachably connected to the needle head seat, one end of the cylinder portion is fixed to the joint portion, and the other end of the cylinder portion extends along an axial direction of the needle tube, the needle tube penetrates through the cylinder portion, and the sliding sleeve is slidably arranged on the cylinder portion.

3. The depth of penetration controllable hand-held water jet needle according to claim 2, characterized in that, The elastic member is a compression spring, the compression spring is sleeved on the cylinder portion, one end of the compression spring abuts against the joint portion, and the other end of the compression spring abuts against an end of the sliding sleeve adjacent to the liquid outlet.

4. The depth of penetration controllable hand-held water jet needle according to claim 2, wherein, A circumferential wall of the sliding sleeve is provided with at least two sliding grooves, the two sliding grooves are arranged in a circumferential direction of the sliding sleeve and are spaced apart from each other, and each sliding groove extends along an axial direction of the sliding sleeve; an outer circumferential surface of the cylinder portion is provided with at least two sliding protrusions, the at least two sliding protrusions correspond to the at least two sliding grooves in a one-to-one manner, and each sliding protrusion is in sliding cooperation with the corresponding sliding groove.

5. The depth of penetration controllable hand-held water jet needle according to claim 4, characterized in that, A circumferential wall of the cylinder portion is provided with a plurality of cutting grooves, each cutting groove extends through the cylinder portion away from the liquid outlet, and each cutting groove defines an elastic strip between two adjacent cutting grooves; the sliding protrusions correspond to the elastic strips in a one-to-one manner, and each sliding protrusion is arranged on the corresponding elastic strip.

6. The depth of penetration controllable hand-held water jet needle according to claim 5, wherein, A guide inclined surface is arranged on the sliding protrusion away from the liquid outlet along the axial direction of the cylinder portion, which is used to guide the elastic strip to deform inwardly, so that the sliding protrusion is inserted into the sliding groove.

7. The depth of penetration controllable hand-held water jet needle according to claim 2, wherein, The sleeve assembly further comprises an adjusting head, the adjusting head has a through hole for the needle tube to extend out of; the adjusting head is threadedly connected to an end of the sliding sleeve away from the liquid outlet, and the adjusting head can change its position in the axial direction of the sliding sleeve by screwing.

8. The depth of penetration controllable hand-held water jet needle according to claim 7, characterized in that, An end of the adjusting head away from the sliding sleeve is provided with a soft rubber pad.

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