Sterile injection needle convenient to accurately adjust and position

Abstract

The utility model relates to a sterile injection needle convenient to accurately adjust and position, which comprises a shell, a negative pressure cavity is arranged on the bottom surface of the shell, a vertical sliding groove is arranged on the top surface of the shell corresponding to the negative pressure cavity, a needle seat is arranged in the sliding groove in a vertical sliding manner, and a needle tube capable of movably penetrating out of the shell and extending into the negative pressure cavity is fixedly arranged on the needle seat. One surface, far away from the needle tube, of the needle seat is connected with a liquid injection screw rod communicated with the needle tube; the liquid injection screw rod is in threaded connection with a rotary cover covering the top end of the sliding chute; the rotary cover is rotationally connected to the shell, and a limiting mechanism which can abut against the rotary cover in the axial direction is arranged between the inner side wall of the rotary cover and the outer side wall of the shell; at least one spring plunger and a plurality of clamping grooves are arranged between the top face of the outer shell and the surface, opposite to the top face of the outer shell, in the rotary cover, the clamping grooves are arranged at intervals in the rotating direction of the rotary cover, and the spring plunger can be dynamically clamped in the clamping grooves. The needle withdrawing device is simple in structure and can realize accurate positioning to control the needle withdrawing length.

Description

Technical Field

[0001] The utility model relates to medical beauty supplies, in particular to a sterile injection needle which is convenient for accurate adjustment and positioning. Background Art

[0002] At present, microneedles and hydrodermabrasion needles on the market are injection needles for skin beauty. The liquid for beauty is injected into the dermis through the needle tip inserted into the skin at the front end. For different users, it is necessary to adjust the length of the needle tube protruding. At present, the way of adjusting the needle length is mostly by the number of turns of the screw thread rotation. The existing injection needles usually include a needle tube, an inner liner needle seat, an outer shell base, an adjustment knob and a liquid injection screw rod. The needle tube is arranged on the inner liner needle seat. The liquid injection screw rod is connected to the side of the inner liner needle seat far from the needle tube. The adjustment knob is threadedly connected to the liquid injection screw rod. At the same time, the adjustment knob is rotatably connected to the outer shell base. By rotating the adjustment knob, the liquid injection screw rod drives the inner liner needle seat to slide up and down in the outer shell base, and the needle tube adjusts its needle length along with the up and down sliding of the inner liner needle seat. The existing structure cannot define the number of rotation turns, and the needle length can only be identified by visual inspection, with a large error. Content of the Utility Model

[0003] Aiming at the existing deficiencies, the utility model provides a sterile injection needle which is convenient for accurate adjustment and positioning.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a sterile injection needle which is convenient for accurate adjustment and positioning, including an outer shell. A negative pressure cavity is arranged on the bottom surface of the outer shell. A vertical sliding groove is arranged on the top surface of the outer shell corresponding to the negative pressure cavity. A needle seat is slidably arranged up and down in the sliding groove. A needle tube which can movably penetrate through the outer shell and extend into the negative pressure cavity is fixedly arranged on the needle seat. A liquid injection screw rod communicated with the needle tube is connected to the side of the needle seat far from the needle tube. A rotating cover covering the top end of the sliding groove is threadedly connected to the liquid injection screw rod. The rotating cover is rotatably connected to the outer shell. A limiting mechanism which can abut against each other in the axial direction of the rotating cover is arranged between the inner side wall of the rotating cover and the outer side wall of the outer shell. At least one spring plunger and a plurality of card slots are arranged between the top surface of the outer shell and the surface of the rotating cover opposite to the top surface of the outer shell. The plurality of card slots are arranged at intervals along the rotation direction of the rotating cover. The spring plunger can be dynamically engaged in the card slots.

[0005] Preferably, numerical values increasing in sequence are arranged circumferentially on the outer side wall of the rotating cover, and the numbers of the numerical values are arranged in an inverted manner. An indicating mark for indicating the numerical values is arranged on the outer side wall of the outer shell.

[0006] Preferably, two spring plungers are arranged and symmetrically arranged on the surface of the rotating cover opposite to the top surface of the outer shell. The card slots are arranged around the sliding groove on the top surface of the outer shell.

[0007] Preferably, the open end of the card slot is rounded.

[0008] Preferably, a cone integrally formed with the outer shell is provided in the negative pressure chamber of the outer shell, and a cone through hole for the syringe needle to pass through is provided on the cone.

[0009] Preferably, the limiting mechanism includes a plurality of sliding blocks arranged at intervals along the circumferential direction on the lower part of the inner side wall of the rotating cover, and a shell step that surrounds the outer side wall of the outer shell for one week, and the lower ends of the sliding blocks and the shell step are in dynamic contact.

[0010] Preferably, a shunt part of a plurality of first shunt channels is provided at the bottom of the liquid injection screw, and each of the first shunt channels is communicated with the liquid injection screw; the needle seat includes a first needle sleeve fixedly connected to the bottom of the shunt part, and a second needle sleeve fixedly connected to the first needle sleeve and / or the shunt part; the syringe needle is installed on the first needle sleeve and is in one-to-one correspondence and communication with the first shunt channel, and sequentially passes through the second needle sleeve and the outer shell and then extends into the negative pressure chamber.

[0011] Preferably, a groove is provided at the top of the second needle sleeve, the first needle sleeve and the shunt part are installed in the groove, and the second needle sleeve is slidably matched in the chute.

[0012] Preferably, a limiting column capable of limiting the downward sliding of the needle seat is provided between the needle seat and the bottom of the chute.

[0013] Preferably, an elastic member capable of elastic deformation is provided at the bottom end of the negative pressure chamber.

[0014] The beneficial effect of the present utility model lies in that: the structure of the utility model is simple, and the rotation angle of the rotating cover can be determined by the engagement between the spring plunger and different card slots, and then the length of the needle exit is determined. The spring plunger and the card slot are arranged axially on the rotating cover. When the rotating cover generates displacement in the axial direction during rotation, the spring plunger and the card slot can always form a stable engagement structure, and there is no risk of disengaging from the engagement, ensuring that the rotating cover can be accurately positioned after rotation. Description of the Drawings

[0015] Figure 1 is a schematic cross-sectional structure diagram of an embodiment of the present utility model;

[0016] Figure 2 is a schematic structure diagram of an embodiment of the present utility model;

[0017] Figure 3 is a schematic structure diagram of an embodiment of the present utility model provided with an elastic member;

[0018] Figure 4 is a schematic exploded structure diagram of an embodiment of the present utility model;

[0019] Figure 5 It is a schematic diagram of the connection structure of the rotary cap and the elastic plunger in the embodiment of the present utility model;

[0020] Figure 6 It is a schematic diagram of the structure at the bottom of the liquid injection screw in the embodiment of the present utility model;

[0021] Names and serial numbers of components in the figure: 1 - outer shell, 10 - negative pressure chamber, 11 - chute, 12 - cone, 120 - through hole of the cone, 13 - elastic member, 2 - needle seat, 20 - first needle sleeve, 21 - second needle sleeve, 210 - groove, 3 - needle tube, 4 - liquid injection screw, 40 - shunt part, 400 - first shunt channel, 5 - rotary cap, 6 - limiting mechanism, 60 - slider, 61 - housing step, 7 - elastic plunger, 70 - clamping groove, 8 - digital scale, 80 - indicator, 9 - limiting post. Specific embodiments

[0022] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. The description is clear and complete. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model. In addition, the directional terms mentioned in the present utility model, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., are only references to the directions of the attached drawings. The directional terms used are for better and clearer description and understanding of the present utility model, rather than indicating or implying the directions that the present utility model must have. Therefore, it cannot be understood as a limitation of the present utility model.

[0023] The embodiments of the present utility model are as follows Figures 1 to 4As shown in the figure, a sterile injection needle facilitating precise adjustment and positioning includes a housing 1. A negative pressure chamber 10 is provided on the bottom surface of the housing 1. A vertical chute 11 is provided on the top surface of the housing 1 at a position corresponding to the negative pressure chamber 10. The chute 11 and the negative pressure chamber 10 are respectively located in the upper and lower parts inside the housing 1, and the housing 1 forms a structure similar to an H shape. A negative pressure interface for connecting an external negative pressure device and communicating with the negative pressure chamber 10 is provided on the outer side wall of the housing 1 corresponding to the negative pressure chamber 10. The negative pressure chamber 10 and the chute 11 are coaxial. A needle seat 2 is slidably arranged up and down in the chute 11. A needle tube 3 is fixedly arranged on the needle seat 2 and can movably pass through the housing 1 and extend into the negative pressure chamber 10. The needle seat 2 slides up and down in the chute 11. When sliding upward, the needle length of the needle tube 3 is shortened, and when sliding downward, the needle length of the needle tube 3 is lengthened. At this time, a cone 12 integrally formed with the housing 1 is arranged in the negative pressure chamber 10 of the housing 1, that is to say, the cone 12 also extends downward from the bottom surface of the housing 1. A cone through hole 120 for the needle tube 3 to pass through is provided on the cone 12. The needle tube 3 is inserted into the cone through hole 120 and extends into the negative pressure chamber 10 through the cone through hole 120 as the needle seat 2 slides downward. A liquid injection screw 4 communicating with the needle tube 3 is connected to one side of the needle seat 2 away from the needle tube 3, that is to say, the needle tube 3 is installed on the bottom surface of the needle seat 2, and the liquid injection screw 4 is installed on the top surface of the needle seat 2. A liquid flow channel penetrating its upper and lower surfaces is provided inside the liquid injection screw 4, and an external thread is provided on the outer wall. The liquid to be injected is injected into the liquid flow channel from the top of the liquid injection screw 4 and then flows into the needle tube 3. A rotary cover 5 covering the top end of the chute 11 is threadedly connected to the liquid injection screw 4. The rotary cover 5 is rotatably connected to the housing 1. The rotary cover 5 is threadedly connected to the liquid injection screw 4 and rotatably connected to the housing 1 at the same time. In this way, as the rotary cover 5 rotates around the housing 1, the liquid injection screw 4 moves upward or downward, realizing the adjustment of the needle length of the needle tube 3. A limiting mechanism 6 capable of abutting against each other in the axial direction of the rotary cover 5 is provided between the inner side wall of the rotary cover 5 and the outer side wall of the housing 1. The rotary cover 5 is prevented from falling off the housing 1 through the limiting mechanism 6. The limiting mechanism 6 includes a plurality of sliders 60 arranged at intervals in the circumferential direction on the lower part of the inner side wall of the rotary cover, and a housing step 61 surrounding the circumference of the outer side wall of the housing 1 at the upper part. The plurality of sliders 60 are at the same height on the inner side wall of the rotary cover 5. The sliders 60 and the rotary cover 5 are integrally formed. After the rotary cover 5 is rotatably connected to the housing 1, the housing step 61 is located above the sliders 60, and the lower ends of the sliders 60 and the housing step 61 are in dynamic abutment. When the rotary cover 5 is rotated upward to a certain height, the sliders 60 abut against the lower end surface of the housing step 61, thereby preventing it from continuing to rotate upward and also avoiding the rotary cover 5 falling off the housing;At least one spring plunger 7 and a plurality of card slots 70 are provided between the top surface of the outer shell 1 and the surface of the rotary cover 5 opposite to the top surface of the outer shell 1. That is to say, the spring plunger 7 and the card slots 70 are arranged in the axial direction of the rotary cover 5. The arrangement in the axial direction will not affect the rotation between the rotary cover 5 and the outer shell 1, nor will the displacement generated in the axial direction when the rotary cover 5 rotates downward affect the engagement between the spring plunger 7 and the card slots 70. Therefore, the rotation of the rotary cover 5 can be more accurately positioned through the engagement of the spring plunger 7 and the card slots 70. The plurality of card slots 70 are arranged at intervals along the rotation direction of the rotary cover 5. The spring plunger 7 can be dynamically engaged in the card slots 70. As the rotary cover 5 rotates, the spring plunger 7 moves from one card slot 70 to another adjacent card slot, and the needle-out length of the syringe 3 is adjusted and positioned at the same time. For example; Figure 5 As shown in the figure, two spring plungers 7 are provided and symmetrically arranged on the surface of the rotary cover 5 opposite to the top surface of the outer shell 1. That is, a rotary cover card slot is arranged on the surface of the rotary cover 5 opposite to the top surface of the outer shell 1, and then the spring plunger 7 is engaged in the rotary cover card slot in a matching manner. As Figure 4 shown in the figure, the card slots 70 are arranged around the chute 11 on the top surface of the outer shell. That is to say, a plurality of card slots 70 are arranged at intervals around the open end of the chute 11 on the top surface of the outer shell 1. For example, the plurality of card slots 70 are arranged in a circle around the chute 11. The spring plunger 7 is arranged on the inner top surface of the rotary cover 5. When the rotary cover 5 is rotatably arranged on the outer shell 1, the inner top surface of the rotary cover 5 faces the top surface of the outer shell 1. The two spring plungers 7 can ensure the stability of the needle-out length positioning and the smooth rotation of the rotary cover 5. In order to facilitate the movement of the spring plunger 7 from one card slot 70 to another card slot 70, the open end of the card slot 70 is chamfered, so that the spring plunger 7 can move smoothly.

[0024] Further improvement, such as Figures 2 to 5As shown in the figure, digital scales 8 with gradually increasing values are arranged circumferentially along the outer side wall of the rotary cap 5. When the needle extension length of the syringe 3 is between 0 and 2.0 mm, the digital scales are set as 0, 0.1, 0.2, 0.3... 2.0. The difference between adjacent digital scales is 0.1. This means that the needle extension length of the syringe 3 can be adjusted by 0.1 mm each time. At this time, one card slot 70 corresponds to one digital scale 8. During the rotation of the rotary cap 5, when the spring plunger 7 moves from one card slot 70 to another adjacent card slot 70, it means that the needle extension length of the syringe 3 is adjusted by 0.1 mm. The numbers of the digital scales 8 are arranged in an inverted manner. When the rotary cap 5 rotates counterclockwise, the digital scales 8 increase sequentially clockwise starting from 0. If the rotary cap 5 rotates clockwise, the digital scales 8 increase sequentially counterclockwise starting from 0. The setting of the digital scales 8 enables a clear understanding of the specific value of the needle extension of the syringe 3, which is more conducive to use. The inverted arrangement of the numbers of the digital scales 8 makes the rotary cap 5 under the top-down view when using this injection needle. At this time, the numbers of the digital scales 8 seen are in a non-inverted state, and the numbers displayed on the digital scales 8 can be seen more clearly. An indicator 80 for indicating the digital scales 8 is provided on the outer side wall of the housing 1. The indicator 80 can be an arrow or a triangular symbol extending from the outer side wall of the housing 1, and it is fixed on the housing 1. The indicator 80 is used to indicate the needle extension length of the syringe 3. In the initial state, the indicator 80 aligns with the 0 position of the digital scale 8. After rotating the rotary cap 5 clockwise or counterclockwise, the indicator 80 aligns with the digital scale 8 with a slightly larger number, that is, it indicates the needle extension length of the syringe 3.

[0025] For further improvement, as Figure 6 shown in the figure, a shunt part 40 with a plurality of first shunt channels 400 is provided at the bottom of the liquid injection screw 4. Each first shunt channel 400 is communicated with the liquid injection screw 4. The number of first shunt channels 400 is set according to the number of syringes 3 provided. One first shunt channel 400 corresponds to one syringe 3. Each first shunt channel 400 is also communicated with the liquid flow channel of the liquid injection screw 4. As Figure 1 and Figure 4As shown in the figure, the needle base 2 includes a first needle sleeve 20 fixedly connected to the bottom of the shunt portion 40, and a second needle sleeve 21 fixedly connected to the first needle sleeve 20 and / or the shunt portion 40; the needle tube 3 is installed on the first needle sleeve 20 and is in one-to-one correspondence and communication with the first shunt channel 400, and then extends into the negative pressure chamber 10 after passing through the second needle sleeve 21 and the outer shell 1 in sequence. The tail of the needle tube 3 is installed on the first needle sleeve 20 and then corresponds to the first shunt channel 400 on the shunt portion 40 one by one. The head of the needle tube 3 passes through the second needle sleeve 21, and then passes through the bottom surface of the outer shell 1 and extends into the negative pressure chamber 10, which means that through holes for the needle tube 3 to pass through are provided on both the second needle sleeve 21 and the bottom surface of the outer shell 1; at this time, the shunt portion 40, the first needle sleeve 20 and the second needle sleeve 21 form a whole, and the second needle sleeve 21 is connected to the first needle sleeve 20 or the shunt portion 40 according to different situations, or is connected to both the first needle sleeve 20 and the shunt portion 40 at the same time. In order to ensure the smooth sliding of the needle base 2 in the chute 11, a groove 210 is provided at the top of the second needle sleeve 21, the first needle sleeve 20 and the shunt portion 40 are installed in the groove 210, and the second needle sleeve 21 is slidably matched in the chute 11, which avoids the contact between the first needle sleeve 20, the shunt portion 40 and the chute wall of the chute 11 and maintains the smooth sliding of the needle base 2.

[0026] A further improvement is as Figure 1 As shown in the figure, a limiting post 9 for limiting the downward sliding of the needle base is provided between the needle base 2 and the bottom of the chute 11. The height of the limiting post 9 is such that the top of the limiting post 9 just abuts against the bottom surface of the needle base 2 when the needle extending length of the needle tube 3 reaches the maximum. In this way, after the needle extending length of the needle tube 3 reaches the maximum, the needle base 2 cannot continue to slide in the chute 11. At the same time, according to the situation, the limiting post 9 can be provided on the bottom surface of the needle base 2 or on the bottom of the chute 11, and a plurality of limiting posts 9 are provided and symmetrically located on the left and right sides of the bottom surface of the needle base 2 or the bottom of the chute 11.

[0027] A further improvement is as Figure 3 and Figure 4 As shown in the figure, an elastic member 13 capable of elastic deformation is provided at the bottom end of the negative pressure chamber 10. The elastic member 13 is made of silica gel. The elastic member 13 is used to reduce the squeezing damage to the skin and can also improve the sealing effect of the negative pressure chamber 10. At this time, in one case, the elastic member 13 is provided at the bottom end of the negative pressure chamber 10, and a good seal is formed when the bottom end of the negative pressure chamber 10 contacts the skin, and the elastic deformation of the elastic member 13 can be used to avoid damage to the skin, such as an annular sleeve sleeved on the bottom end of the negative pressure chamber 10. In another case, after a cone 12 is provided in the negative pressure chamber 10, a conical sleeve is also sleeved on the cone 12, and a conical sleeve through hole for the needle tube 3 to extend out is provided on the conical sleeve. In the third case, the annular sleeve provided at the bottom end of the negative pressure chamber 10 and the conical sleeve provided on the cone 12 are integrally formed.

[0028] Although the present utility model has been described in detail with general descriptions and specific embodiments above, modifications or improvements can be made thereto based on the present utility model, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present utility model all fall within the scope of protection required by the present utility model.

Claims

1. A sterile injection needle that is easy to adjust and position accurately, characterized in that: The syringe comprises a shell, the bottom surface of which is provided with a negative pressure chamber, the top surface of which is provided with a vertical slide groove at a position corresponding to the negative pressure chamber, a needle seat being provided in the slide groove for sliding up and down, a needle tube being fixedly provided on the needle seat and being able to movably pass through the shell and extend into the negative pressure chamber, the needle seat being connected with an injection screw connected with the needle tube on a side away from the needle tube, the injection screw being threadedly connected with a rotating cover arranged on the top end of the slide groove; the rotating cover being rotatably connected to the shell, a limiting mechanism being able to abut against the rotating cover in the axial direction thereof being provided between the inner side wall of the rotating cover and the outer side wall of the shell; at least one spring plunger and a plurality of card slots being provided between the top surface of the shell and the surface in the rotating cover opposite to the top surface of the shell, the plurality of card slots being arranged at intervals along the rotation direction of the rotating cover, and the spring plunger being able to dynamically engage in the card slot.

2. The sterile injection needle that is easy to adjust and position accurately according to claim 1, characterized in that : A digital scale with increasing values ​​is arranged on the outer wall of the rotating cover along the circumference of the rotating cover, and the numbers on the digital scale are arranged inverted; an indicator for indicating the digital scale is arranged on the outer wall of the shell.

3. The sterile injection needle that is easy to adjust and position accurately according to claim 1, characterized in that The spring plungers are provided with two and are symmetrically arranged on the surface inside the rotating cover opposite to the top surface of the shell, and the card slot is arranged around the slide slot on the top surface of the shell.

4. The sterile injection needle that is easy to adjust and position accurately according to claim 1 or 3, characterized in that : The opening end of the slot has rounded corners.

5. The sterile injection needle that is easy to adjust and position accurately according to claim 1, characterized in that The shell is provided with a cone integrally formed with the shell in the negative pressure chamber, and the cone is provided with a cone through hole for the needle tube to pass through.

6. The sterile injection needle that facilitates precise adjustment and positioning according to claim 1, characterized in that The limiting mechanism includes a plurality of sliders arranged at intervals along the circumferential direction at the lower part of the inner wall of the rotating cover, and a shell step arranged at the upper part of the outer wall of the shell and surrounding the circumference thereof, and the lower ends of the sliders and the shell step are in dynamic abutment.

7. The sterile injection needle that facilitates precise adjustment and positioning according to claim 1, characterized in that : A plurality of first shunt channels are provided at the bottom of the injection screw, and each of the first shunt channels is communicated with the injection screw; the needle seat comprises a first needle sleeve fixedly connected to the bottom of the shunt channel, and a second needle sleeve fixedly connected to the first needle sleeve and / or the shunt channel; the needle tube is installed on the first needle sleeve and communicates with the first shunt channels one by one, and sequentially passes through the second needle sleeve and the shell and then extends into the negative pressure chamber.

8. The sterile injection needle that facilitates precise adjustment and positioning according to claim 7, characterized in that A groove is arranged on the top of the second needle sleeve, the first needle sleeve and the diversion part are installed in the groove, and the second needle sleeve is matched and slidably arranged in the slide groove.

9. The sterile injection needle that facilitates precise adjustment and positioning according to claim 1, characterized in that A limiting column is arranged between the needle seat and the bottom of the slide groove to limit the needle seat from sliding downward.

10. The sterile injection needle that facilitates precise adjustment and positioning according to claim 1, characterized in that : An elastic member capable of elastic deformation is arranged at the bottom end of the negative pressure chamber.

Images