A precisely calibrated boss-type multi-needle injection needle

Abstract

A multi-needle injection needle with a precisely calibrated boss type, comprising a needle seat, a negative pressure seat, a cone seat, an adjusting knob, a needle tube, and a needle adjusting spring; a circumferentially extending adjusting boss is provided on the outer wall of the needle seat, a stepped groove is provided on the end face of the adjusting boss, a toothed surface is provided on the side wall, and correspondingly matching latches and protrusions are provided on the adjusting knob, and the needle adjusting spring is sleeved on the cone seat and its elastic restoring force acts on the adjusting knob. By rotating the adjusting knob to move along the stepped groove on the adjusting boss of the needle seat, the negative pressure seat can be moved axially relative to the needle seat to control the needle outlet length; the stepped groove design includes the tolerances and deviations that may occur in the needle production, and can achieve high-precision output of the final needle adjustment; the needle seat and the negative pressure seat also cooperate through a guide hole and a guide column to ensure the accuracy of the needle outlet length; the position of the negative pressure input port is adjusted on the negative pressure seat and an inertial anti-backflow mechanism is added to prevent leaked liquid from being sucked back into the negative pressure tube and causing air path blockage.

Description

Technical Field

[0001] The invention belongs to the technical field of syringes, and in particular relates to a precisely calibrated boss-type multi-needle injection needle. Background Art

[0002] The structure of multi-needle injection needle products on the market is mostly as follows Figure 1 As shown, it includes a needle seat 1, a shunt seat 2, a negative pressure seat 3, a cone seat 4, an adjusting knob 5, and a needle tube 6. The negative pressure seat 3 and the adjusting knob 5 are tightly fastened together, and the cone seat 4 and the adjusting knob 5 are threaded together. The cone seat 4 has an external thread, and the center hole of the adjusting knob 5 has an internal thread. By rotating the adjusting knob 5, the negative pressure seat 3 moves up and down, and then the needle outlet surface a of the negative pressure seat 3 moves, so that the distance between the needle tube 6 fixed on the needle seat 1 and the shunt seat 2 and the needle outlet surface a of the negative pressure seat 3 changes, thereby achieving the purpose of adjusting the needle outlet length.

[0003] This method of adjusting the needle length is simple, but it places high demands on the thread. At the same time, the entire process of rotating the adjustment knob 5 poses risks in achieving positioning at any time without deflection. Furthermore, because it is a stepless adjustment, it is very difficult to accurately calibrate and indicate the needle length adjustment in conjunction with the entire needle. Without a scale, the user needs to use their eyes to assess the 0.1mm error during adjustment, which is difficult to control. Furthermore, the negative pressure input port of the negative pressure seat 3 is located low, and liquid often leaks into the external negative pressure tube, affecting the negative pressure capacity. If it is not cleaned for a long time and accumulates, it will clog the tube and damage the system pump components. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a multi-needle injection needle with a precisely calibrated boss.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The needle holder is fixed on the upper part of the syringe and the adjusting knob is fixed on the lower part of the syringe. The adjusting knob is fixed on the upper part of the syringe and the adjusting knob is fixed on the lower part of the syringe. The adjusting knob is fixed on the upper part of the syringe and the adjusting knob is fixed on the lower part of the syringe. The adjusting knob is fixed on the upper part of the syringe and the adjusting knob is fixed on the upper ... A tooth surface is provided on the side wall along the extension direction, and the inner side wall of the adjusting knob is evenly distributed in the circumferential direction with two or more teeth that cooperate with the stepped groove of the adjusting boss and two or more protrusions that cooperate with the tooth surface of the adjusting boss; a negative pressure input port is provided on the side wall of the inner cavity part of the needle seat of the negative pressure seat, and an inertial anti-backflow mechanism is provided on the diaphragm of the negative pressure seat; by rotating the adjusting knob, the teeth of the adjusting knob move along the stepped groove on the adjusting boss of the needle seat, and then the adjusting knob drives the negative pressure seat to move axially relative to the needle seat, so that the axial relative position between the needle outlet surface of the negative pressure seat and the needle tube on the needle seat changes to control the needle outlet length, and at the same time, the protrusion of the adjusting knob moves along the tooth surface on the adjusting boss of the needle seat to achieve the adjustment feel and the positioning between the adjusting knob and the needle seat.

[0007] Furthermore, the needle seat and the negative pressure seat are respectively provided with a guide hole and a guide column for axial guiding cooperation.

[0008] Furthermore, each stepped groove of the needle seat has a first stop block at one end corresponding to the lowest step surface, and a second stop block at the other end corresponding to the highest step surface. Furthermore, the second stop block has an inclined surface connected to the highest step surface.

[0009] Furthermore, at least one stepped surface of each stepped groove of the needle seat corresponds to one needle exit length.

[0010] Furthermore, an annular groove is provided on the other end face of the negative pressure seat, and an annular guide edge is provided on the open end face of the adjusting knob. The negative pressure seat and the adjusting knob are axially tightly connected and can rotate relative to each other through the cooperation of the annular groove and the annular guide edge.

[0011] Furthermore, a first buckle is provided on the side wall of the other end of the negative pressure seat, and a second buckle is provided on the side wall of the adjusting knob. The negative pressure seat and the adjusting knob are axially engaged through the cooperation of the first buckle and the second buckle.

[0012] Furthermore, the inertial anti-backflow mechanism on the diaphragm of the negative pressure seat includes a basin-shaped structure, an opening, and a drainage column. The basin-shaped structure is arranged on the diaphragm and is convex relative to the surface of the diaphragm facing the needle seat and concave relative to the surface facing the needle seat. There are more than two openings on the side wall of the basin-shaped structure that are not facing the negative pressure input port along the circumferential direction, and a drainage column arranged along the axis is provided in the basin-shaped structure.

[0013] Furthermore, an indicator arrow and a scale are respectively provided on the outer side walls of the negative pressure seat and the adjustment knob.

[0014] Furthermore, the needle seat is provided with a concave cavity for inserting one end of the cone seat and a plurality of first needle tube mounting holes connected to the bottom of the concave cavity, a diversion cavity is formed between the bottom of the concave cavity of the needle seat and one end surface of the cone seat, a first flow channel connecting the plurality of first needle tube mounting holes is provided on the bottom of the concave cavity of the needle seat, a plurality of second needle tube mounting holes corresponding to the plurality of first needle tube mounting holes are provided on the negative pressure seat, a channel connected to the diversion cavity is provided on the cone seat, a second flow channel connected to the channel and corresponding to the first flow channel is provided on one end surface of the cone seat, each of the plurality of needle tubes is fixed in the first needle tube mounting hole and passed through the second needle tube mounting hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) A circumferentially extending adjustment boss is provided on the outer wall of the needle seat, a stepped groove is provided on the end face of the adjustment boss, a tooth surface is provided on the side wall, a locking tooth engaged with the stepped surface of the stepped groove and a protrusion engaged with the tooth groove of the tooth surface are provided on the adjustment knob, and a needle adjustment spring is additionally provided on the conical seat. The elastic restoring force of the needle adjustment spring acts on the adjustment knob, so that the locking teeth and protrusion of the adjustment knob are closely matched with the adjustment boss of the needle seat. When the adjustment knob is rotated, the locking teeth of the adjustment knob move along the stepped groove on the adjustment boss of the needle seat, and then the adjustment knob drives the negative pressure seat to move axially relative to the needle seat, so that the axial relative position between the needle outlet surface of the negative pressure seat and the needle tube on the needle seat changes to control the needle outlet length. At the same time, the protrusion of the adjustment knob moves along the tooth surface on the adjustment boss of the needle seat, so as to achieve the adjustment feel and the positioning between the adjustment knob and the needle seat;

[0017] (2) At least one step surface of each stepped groove corresponds to one needle length, and the needle adjustment deviation between each step surface is 0.02mm. By setting up multiple step surfaces, the tolerance and deviation that may occur in the needle production are included. After completing the production and assembly of the multi-needle injection molding needle, the relevant needle adjustment indication is calibrated by measuring the needle after adjustment to achieve high-precision output of the final needle adjustment, and the final needle adjustment accuracy is less than ±0.05mm;

[0018] (3) The fit between the teeth of the adjusting knob and the stepped groove of the needle seat is a plane fit, which has higher precision and better flatness than the existing thread fit;

[0019] (4) The needle seat and the negative pressure seat are respectively provided with multiple guide holes and multiple guide columns for guiding cooperation, so that the two can move precisely and concentrically, ensuring the accuracy of the needle length and easy to achieve accurate calibration;

[0020] (5) The position of the negative pressure input port on the negative pressure seat was adjusted, and a sealing ring was added to seal between the outer wall of the needle seat and the inner wall of the negative pressure seat, so that the needle seat and the negative pressure seat fit tightly together during the process of the multi-needle injection needle sucking up the negative pressure of the skin, and will not be separated due to the operator pulling the skin;

[0021] (6) An inertial anti-backflow mechanism is added to the diaphragm of the negative pressure seat, and the position adjustment of the negative pressure input port on the negative pressure seat is coordinated to prevent possible leakage during the multi-needle injection process from entering the external negative pressure tube through the negative pressure input port 306;

[0022] (7) There are indicator arrows and scales on the negative pressure seat and the adjustment knob respectively. In actual application, the adjustment needle can be adjusted according to the scale, avoiding errors caused by visual judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of a multi-needle injection needle in the prior art;

[0024] Figure 2 This is a schematic structural diagram of a multi-needle injection needle of the present invention;

[0025] Figure 3 Schematic diagram of the explosion of the multi-needle injection needle of the present invention;

[0026] Figure 4 is a schematic cross-sectional view of a multi-needle injection needle of the present invention;

[0027] Figure 5 is another schematic cross-sectional view of the multi-needle injection needle of the present invention;

[0028] Figure 6 Schematic diagram of the structure of the needle seat in the multi-needle injection needle of the present invention;

[0029] Figure 7 A schematic structural diagram of a negative pressure seat in a multi-needle injection needle head of the present invention;

[0030] Figure 8 Another structural schematic diagram of the negative pressure seat in the multi-needle injection needle of the present invention;

[0031] Figure 9 This is a schematic structural diagram of the adjustment knob in the multi-needle injection needle of the present invention;

[0032] Figure 10 Schematic diagram of the cooperation between the stepped groove of the needle seat and the latching teeth of the adjustment knob in the multi-needle injection needle of the present invention;

[0033] Figure 11 Schematic diagram of the fit between the toothed surface of the needle seat and the protrusion of the adjustment knob in the multi-needle injection needle of the present invention;

[0034] Figure 12 Schematic diagram of the indicating arrow of the negative pressure seat and the scale of the adjustment knob in the multi-needle injection needle of the present invention.

[0035] The reference numerals are as follows:

[0036] a Needle exit surface

[0037] 1 needle seat

[0038] 101 first needle tube installation hole

[0039] 102 guide hole

[0040] 103 adjusting boss

[0041] 104 step trough

[0042] 105 first stop block

[0043] 106 second stop block

[0044] 107 tooth surface

[0045] 2 shunt seat

[0046] 3 negative pressure seat

[0047] 301 diaphragm

[0048] 302 second needle tube installation hole

[0049] 303 guide column

[0050] 304 annular slot

[0051] 305 first buckle

[0052] 306 negative pressure input port

[0053] 307 basin-shaped structure

[0054] 308 opening

[0055] 309 drainage column

[0056] 310 indicator arrow

[0057] 4 cone seats

[0058] 5 adjustment knobs

[0059] 501 center hole

[0060] 502 second buckle

[0061] 503 annular guide edge

[0062] 504 tooth

[0063] 505 bulge

[0064] 506 scale

[0065] 6-needle tube

[0066] 7 Needle adjustment spring

[0067] 8 sealing rings. DETAILED DESCRIPTION

[0068] The following describes the specific embodiments of the present invention in detail in conjunction with the accompanying drawings so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative, rather than limiting, the scope of the present invention.

[0069] See also Figures 2 to 5 A multi-needle injection needle with a precisely calibrated boss structure includes a needle seat 1, a negative pressure seat 3, a cone seat 4, an adjustment knob 5, a needle tube 6, a needle adjustment spring 7, and a sealing ring 8. The main differences from the prior art are that the diverter seat is removed, and the connection and matching structure between the needle seat 1 and the negative pressure seat 3, the connection and matching structure between the needle seat 1 and the adjustment knob 5, the connection and matching structure between the negative pressure seat 3 and the adjustment knob 5, the inertial anti-backflow mechanism on the negative pressure seat 3, and the needle adjustment spring 7 are added. The position of the negative pressure input port 306 of the negative pressure seat 3 is adjusted.

[0070] The following is a detailed description of each component.

[0071] See also Figures 4 to 6 The needle hub 1 is provided with a concave cavity and multiple first needle tube mounting holes 101 communicating with the bottom surface of the concave cavity. The needle hub 1 is mounted inside the negative pressure seat 3. The bottom surface of the concave cavity of the needle hub 1 is provided with a first flow channel connecting the multiple first needle tube mounting holes 101. Two or more guide holes 102 are centrally located on the end surface of the needle hub 1 facing the interior of the negative pressure seat 3. These holes 102 cooperate with the two or more guide posts 303 of the negative pressure seat 3 to achieve precise concentric axial movement between the needle hub 1 and the negative pressure seat 3, thereby ensuring the accuracy of the needle withdrawal length.

[0072] On the outer wall of the other end of the needle seat 1, there are two or more circumferentially extending adjustment bosses 103 evenly distributed along the circumferential direction. A stepped groove 104 is provided on the end surface of each adjustment boss 103 facing the inside of the negative pressure seat 3 in the extending direction to cooperate with the tooth 504 of the adjustment knob 5. Figure 10To achieve the desired needle adjustment, each stepped surface of the stepped groove 104 corresponds to a needle adjustment level. In this embodiment, there are nine first needle tube mounting holes 101 arranged in a 3*3 rectangular array. There are two guide holes 102 symmetrically distributed around the center first needle tube mounting hole 101. There are three adjustment bosses 103, and the stepped grooves 104 thereon extend in the same direction along the circumference of the needle hub 1.

[0073] Furthermore, a toothed surface 107 is provided on the side wall of each adjusting boss 103 along the extending direction to cooperate with the protrusion 505 of the adjusting knob 5. Figure 11 , generating the adjustment feel when rotating the adjustment knob 5 and locating the position between the needle base 1 and the adjustment knob 5. When the tooth grooves of the tooth surface 107 engage with the protrusion 505 of the adjustment knob 5, a click sound is emitted. The tooth grooves of the tooth surface 107 and the stepped surfaces of the stepped groove 104 can be arranged in a one-to-one correspondence. Each stepped groove 104 is provided with a first stop block 105 at one end corresponding to the lowest step surface, and a second stop block 106 at the other end corresponding to the highest step surface. The first and second stop blocks 105, 106 are used to limit the movement range of the teeth 504 of the adjustment knob 5, that is, the needle adjustment range. The second stop block 106 also has an inclined surface that connects with the highest step surface of the stepped groove 104, so that the teeth 504 of the adjustment knob 5 can smoothly engage with the stepped groove 104 during assembly, entering the needle adjustment area, and the protrusion 505 of the adjustment knob 5 engages with the tooth grooves of the tooth surface 107.

[0074] See also Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 The negative pressure seat 3 is mounted on the outside of the needle hub 1. One end of the negative pressure seat 3 serves as the needle outlet surface and is intended for contact with the skin. The other end of the negative pressure seat 3 is used to insert the needle hub 1 and install the adjustment knob 5. A diaphragm 301 is provided within the negative pressure seat 3, dividing the inner cavity into two parts. The diaphragm 301 is provided with multiple second needle tube mounting holes 302 corresponding to the multiple first needle tube mounting holes 101 of the needle hub 1. Centrally located on the surface of the diaphragm 301 facing the needle hub 1 are two or more guide posts 303 corresponding to the two or more guide holes 102 of the needle hub 1. This allows for precise, concentric axial movement between the negative pressure seat 3 and the needle hub 1. In this embodiment, there are two guide posts 303, symmetrically distributed around the central second needle tube mounting hole 301.

[0075] The other end surface of the negative pressure seat 3 is provided with a concave annular groove 304 to cooperate with the annular guide edge 503 of the adjustment knob 5, thereby achieving a tight axial connection between the negative pressure seat 3 and the adjustment knob 5, while allowing relative rotation between the negative pressure seat 3 and the adjustment knob 5. A first snap 305 distributed or extending along the circumference is provided in the annular groove 304 to cooperate with the second snap 502 of the adjustment knob 5 to achieve axial engagement between the negative pressure seat 3 and the adjustment knob 5. The first snap 305 can be provided on the side wall and / or bottom surface of the annular groove 304. In this embodiment, the first snap 305 is distributed along the circumference on the outer ring side wall of the annular groove 304.

[0076] The sidewall of the inner cavity of the negative pressure holder 3, which houses and cooperates with the needle holder 1, is equipped with a negative pressure inlet 306 for connecting to an external suction device. The outer wall of the needle holder 1 is provided with a sealing ring groove, into which a sealing ring 8 is embedded. Sealing ring 8 is preferably corrosion-resistant and provides a seal between the outer wall of the needle holder 1 and the inner wall of the negative pressure holder 3. By adjusting the position of negative pressure inlet 306 and adding sealing ring 8, the needle holder 1 and negative pressure holder 3 are tightly coupled during the negative pressure application of the multi-needle injection needle, preventing them from separating due to the operator pulling on the skin.

[0077] The diaphragm 301 of the negative pressure seat 3 also features an inertial backflow prevention mechanism to prevent leaked liquid from being drawn back into the negative pressure tube. This mechanism includes a basin-shaped structure 307, an opening 308, and a drainage post 309. There are at least one basin-shaped structure 307, each of which is positioned on the diaphragm 301 and projects outward from the surface facing the needle seat 1 and is concave inward from the surface facing away from the needle seat 1. The sidewalls of the basin-shaped structure 307 are circumferentially provided with at least two openings 308 that are not facing the negative pressure inlet 306. A drainage post 309 is positioned within the basin-shaped structure 307 along its axis. By adjusting the position of the negative pressure inlet 306 and adding the inertial backflow prevention mechanism, any leaked liquid during multi-needle injections is prevented from entering the external negative pressure tube through the negative pressure inlet 306. In this embodiment, there are two basin-shaped structures 307 and they are symmetrically distributed around the middle second needle tube mounting hole 301, and the two basin-shaped structures 307 and the two guide columns are distributed in a 2*2 rectangular array as a whole.

[0078] See also Figure 4 and Figure 5 The conical seat 4 passes through the center hole 501 of the adjustment knob and one end extends into the concave cavity of the needle hub 1. One end of the conical seat 4 is connected to the concave cavity of the needle hub 1 via a sealant. A diversion cavity is formed between the end surface of the conical seat 4 and the bottom surface of the concave cavity of the needle hub 1. A second flow channel corresponding to the first flow channel of the needle hub 1 is provided on the end surface of the conical seat 4. A channel is provided along the axis of the conical seat 4, communicating with the diversion cavity. One end of the channel is connected to the second flow channel.

[0079] See also Figure 4 、 Figure 5 、 Figure 9 The adjusting knob 5 is in the shape of a cover and is mounted on the other end of the negative pressure seat 3. The adjusting knob 5 is provided with a central hole 501 for the conical seat 4 to pass through. The side wall of the adjusting knob 5 is provided with a second snap-on 502 distributed or extending in the circumferential direction to cooperate with the first snap-on 305 of the negative pressure seat to achieve axial engagement between the adjusting knob 5 and the negative pressure seat 3. The second snap-on 502 can be provided on the inner side wall and / or outer side wall of the adjusting knob 5. In this embodiment, the second snap-on 502 is provided on the outer side wall of the adjusting knob 5 and extends in the circumferential direction. The end surface of the opening 308 of the adjusting knob 5 is provided with an annular guide edge 503 to cooperate with the annular groove 304 of the negative pressure seat 3 to achieve an axial tight connection between the negative pressure seat 3 and the adjusting knob 5, while allowing the adjusting knob 5 to rotate relative to the negative pressure seat 3 with the conical seat 4 as the central axis. There are two or more latching teeth 504 evenly distributed along the circumferential direction on the inner side wall of the adjusting knob 5 to cooperate with the stepped groove 104 on the adjusting boss 103 of the needle seat 1. Figure 10 , to achieve the needle adjustment goal. The inner wall of the adjustment knob 5 is evenly distributed along the circumference with two or more protrusions 505 to cooperate with the tooth surface 107 on the adjustment boss 103 of the needle seat 1. Figure 11 , achieving an adjusting feel when rotating the adjusting knob 5. In this embodiment, the number of the latch teeth 504 and the number of the protrusions 505 are both three.

[0080] See also Figure 4 and Figure 5 Each needle tube 6 of the multiple needle tubes 6 is fixed in a first needle tube mounting hole 101 of the needle seat 1 by dispensing glue, and is passed through a second needle tube mounting hole 302 of the corresponding negative pressure seat 3.

[0081] See also Figure 4 and Figure 5 Needle adjustment spring 7 is mounted on cone base 4, with its two ends respectively resting against one end of cone base 4 and the inner bottom surface of adjustment knob 5. Needle adjustment spring 7 is always in a compressed state. Needle adjustment spring 7 ensures the positioning between stepped groove 104 of needle base 1 and latching teeth 504 of adjustment knob 5 during needle adjustment, and also adjusts the feel of operating the adjustment knob.

[0082] In addition, in this embodiment, the stepped groove 104 on each adjustment boss 103 of the needle seat 1 has 33 steps. Except for the return 0 surface, the other steps are spaced 0.02mm apart. After the needle length is calibrated after production, five levels of needle withdrawal length will be generated. Each level of needle withdrawal length corresponds to a certain number of steps, that is, a certain number of needle adjustment levels. The first level of needle withdrawal length makes the needle tip of the needle tube 6 completely retracted inside the multi-needle injection needle, and the second level of needle withdrawal length makes the needle tip of the needle tube 6 slightly extend out of the needle withdrawal surface of the negative pressure seat 3. The third to fifth levels of needle withdrawal length correspond to different injection depths and need to be adjusted according to different injection situations. The error range of each level of needle withdrawal length is within ±0.05mm. The outer walls of the negative pressure seat 3 and the adjustment knob 5 are also provided with an indicator arrow 310 and a scale 506, see Figure 12 , the scale 506 indicates the needle output length of the last needle adjustment output, and the needle output length can be accurately calibrated by the indicating arrow 310 and the scale 506.

[0083] When the needle exit length needs to be adjusted, the adjustment knob 5 can be directly rotated, causing the locking teeth 504 of the adjustment knob 5 to move along the stepped groove 104 on the adjustment boss 103 of the needle seat 1. The adjustment knob 5 will drive the negative pressure seat 3 to move axially relative to the needle seat 1, causing the axial relative position between the needle exit surface of the negative pressure seat 3 and the needle tube 6 on the needle seat 1 to change. At the same time, the protrusion 505 of the adjustment knob 5 moves along the tooth surface 107 on the adjustment boss 103 of the needle seat 1, creating an adjustment feel when rotating the adjustment knob 5. Every time the protrusion 505 of the adjustment knob 5 engages a tooth groove on the tooth surface 107, a click sound is emitted. When the required scale 506 position on the adjusting knob 5 is aligned with the indicating arrow 310 on the negative pressure seat 3, the locking tooth 504 of the adjusting knob 5 is locked on the corresponding step surface of the step groove 104, and the protrusion 505 of the adjusting knob 5 is locked into the corresponding tooth groove of the tooth surface 107, thereby completing the needle outlet length adjustment and achieving the purpose of high-precision control of the needle outlet length.

[0084] During actual use, the cone seat 4 is fixedly mounted on the front end of the syringe, and the cone seat 4 and the needle seat 1 are connected by sealant. During the rotation of the adjusting knob 5, the position of the needle seat 1 will remain stationary, and the needle adjusting spring 7 is always in a compressed state and pressed between one end of the cone seat 4 and the adjusting knob 5. The elastic restoring force of the needle adjusting spring 7 makes the locking teeth 504 of the adjusting knob 5 and the stepped surface of the stepped groove 104 of the needle seat 1 in close contact, thereby ensuring the adjustment feel of rotating the adjusting knob 5.

[0085] In addition, before rotating the adjusting knob 5, you can press it to compress the needle adjusting spring 7, so that the locking tooth 504 of the adjusting knob 5 disengages from the stepped surface of the stepped groove 104 on the adjusting boss 103 of the needle seat 1, and then continue the subsequent rotation operation. When the adjusting knob 5 is rotated to the right position, the locking tooth 504 of the adjusting knob 5 will be locked on the corresponding stepped surface of the stepped groove 104 under the elastic restoring force of the needle adjusting spring 7, and the needle length can be adjusted in this way.

[0086] It should be noted that the present invention, having been fully described, is susceptible to numerous variations and modifications, and is not limited to the specific embodiments described above. The foregoing embodiments are intended to illustrate the present invention, not to limit it. In short, the scope of protection of the present invention encompasses any such variations, substitutions, and modifications as would be apparent to one of ordinary skill in the art.

Claims

1. A precisely calibrated boss-type multi-needle injection needle, comprising a needle seat, a negative pressure seat, a cone seat, an adjustment knob, and a needle tube. The needle seat is installed in the negative pressure seat, one end face of the negative pressure seat being a needle outlet surface, and the other end being used for inserting the needle seat and having an adjustment knob installed thereon. A transverse partition is provided in the negative pressure seat to divide the inner cavity into two parts. The cone seat passes through the adjustment knob and one end is connected to the needle seat by a sealant. The needle tube is fixed to the needle seat, characterized in that: It also includes a needle adjustment spring, which is installed on the cone seat and has two ends respectively arranged on one end of the cone seat and the inner bottom surface of the adjustment knob, and the needle adjustment spring is in a compressed state; The outer wall of the needle seat is uniformly distributed along the circumferential direction with two or more adjusting bosses extending in the circumferential direction, and the end face of each adjusting boss is provided with a stepped groove in the extending direction, and the side wall is provided with a toothed surface in the extending direction. The inner wall of the adjusting knob is uniformly distributed along the circumferential direction with two or more latching teeth that cooperate with the stepped grooves of the adjusting boss and two or more protrusions that cooperate with the toothed surfaces of the adjusting boss; A negative pressure input port is provided on the side wall of the inner cavity portion of the negative pressure seat where the needle seat is installed, and an inertial backflow prevention mechanism is provided on the transverse partition of the negative pressure seat; By rotating the adjusting knob, the locking teeth of the adjusting knob move along the stepped groove on the adjusting boss of the needle seat, and then the adjusting knob drives the negative pressure seat to move axially relative to the needle seat, so that the axial relative position between the needle outlet surface of the negative pressure seat and the needle tube on the needle seat changes to control the needle outlet length. At the same time, the protrusion of the adjusting knob moves along the tooth surface on the adjusting boss of the needle seat, thereby achieving the adjustment feel and the positioning between the adjusting knob and the needle seat; The conical seat passes through the central hole of the adjusting knob and one end extends into the concave cavity of the needle seat. One end of the conical seat and the concave cavity of the needle seat are connected by a sealant. A shunt cavity is formed between the end surface of one end of the conical seat and the bottom surface of the concave cavity of the needle seat. A second flow channel corresponding to the first flow channel of the needle seat is provided on the end surface of one end of the conical seat. A channel connected to the shunt cavity is provided along the axis of the conical seat, and one end of the channel is connected to the second flow channel. The needle seat and the negative pressure seat are respectively provided with a guide hole and a guide column for axial guidance cooperation; Each stepped groove of the needle seat is provided with a first stop block at one end corresponding to the lowest step surface, and a second stop block at the other end corresponding to the highest step surface; The second stop block is provided with an inclined surface connected with the highest step surface; At least one stepped surface of each stepped groove of the needle seat corresponds to one needle outlet length; An annular groove is provided on the other end surface of the negative pressure seat, and an annular guide edge is provided on the open end surface of the adjusting knob. The negative pressure seat and the adjusting knob are tightly connected axially and can rotate relative to each other through the cooperation of the annular groove and the annular guide edge. A first buckle is provided on the side wall of the other end of the negative pressure seat, and a second buckle is provided on the side wall of the adjusting knob. The negative pressure seat and the adjusting knob are axially engaged through the cooperation of the first buckle and the second buckle; The inertial backflow prevention mechanism on the diaphragm of the negative pressure seat includes a basin-shaped structure, an opening, and a drainage column. The basin-shaped structure is arranged on the diaphragm and is convex relative to the surface of the diaphragm facing the needle seat and concave relative to the surface facing the needle seat. The side wall of the basin-shaped structure is provided with two or more openings not facing the negative pressure input port along the circumferential direction, and a drainage column is provided in the basin structure along the axis. The outer side walls of the negative pressure seat and the adjusting knob are respectively provided with an indicating arrow and a scale; The needle seat is provided with a concave cavity for one end of the cone seat to be placed in and a plurality of first needle tube mounting holes connected to the bottom of the concave cavity. A shunt cavity is formed between the bottom of the concave cavity of the needle seat and the end surface of one end of the cone seat. A first flow channel connecting the plurality of first needle tube mounting holes is provided on the bottom of the concave cavity of the needle seat. A plurality of second needle tube mounting holes corresponding to the plurality of first needle tube mounting holes are provided on the negative pressure seat. A channel connected to the shunt cavity is provided on the cone seat. A second flow channel connected to the channel and corresponding to the first flow channel is provided on the end surface of one end of the cone seat. Each needle tube of the plurality of needle tubes is fixed in the first needle tube mounting hole and is passed through the second needle tube mounting hole.

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