Needle holding device

Abstract

The utility model discloses a needle holding device, relates to the technical field of medical instruments, and solves the technical problem that needle bodies with different lengths are inconvenient to clamp and fix by the existing device. The disposable syringe comprises a holding cylinder, a fixing cylinder, a guide assembly, a fixing assembly and a needle core, one end of the fixing cylinder is slidably connected into the holding cylinder, the other end of the fixing cylinder extends outwards, the guide assembly is arranged on the inner wall of the fixing cylinder and comprises a first guide part and at least one second guide part, the first guide part is arranged in the axial direction of the fixing cylinder, and the second guide part is arranged in the axial direction of the fixing cylinder. The second guiding piece is perpendicular to the first guiding piece, a fixing assembly is slidably connected to the first guiding piece and the second guiding piece and comprises a first connecting rod and at least one second connecting rod, the ends of the first connecting rod and the second connecting rod are hinged, and the other ends of the first connecting rod and the second connecting rod are slidably connected with the first guiding piece and the second guiding piece respectively. The needle core is movably arranged in the holding cylinder and the fixing cylinder. The needle core clamping device has the advantages of being convenient to clamp the needle core, high in efficiency and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to a needle holding device. BACKGROUND

[0002] Plastic surgery refers to the repair and reshaping of human appearance and body shape by using surgery, drugs, medical devices and other medical technology methods, which includes face plastic surgery, chest plastic surgery, liposuction weight loss, lip plastic surgery and other projects; cosmetic needles are common instruments in plastic surgery, such as pimple extraction needles and acne needles, which are relatively long and slender, and in order to better hold the cosmetic needles, the staff usually uses a needle holding device to clamp the cosmetic needles.

[0003] In the document with the publication number CN215914712U, a cosmetic needle holder is disclosed, which comprises a needle, a device main body and a handle, the needle is arranged at the front end of the device main body, the handle is arranged at the rear end of the device main body, a soft pad is arranged on the inner wall of the handle, a connecting rod is arranged on the side of the handle, a storage cavity is arranged in the device main body, the needle is movably connected in the sleeve, and the side end of the needle penetrates through the sleeve and is embedded in the storage cavity. In this device, a cavity is arranged in the sidewall of the clamping ring, a threaded sleeve is threadedly connected to the threaded rod rotatably connected in the cavity, the threaded sleeve is moved on the threaded rod by rotating the threaded rod, the threaded sleeve drives the side support rod to move, and the sleeve clamps the cosmetic needle.

[0004] However, in the above-mentioned patent, the screw rod on both sides needs to be twisted to drive the threaded sleeve and the side support rod to move up and down, so as to clamp the needle, which is not convenient to operate and not convenient to control the length of the needle extending out, resulting in low clamping efficiency.

[0005] In view of the problems existing in the prior art, it is necessary to study a needle holding device which is convenient for clamping and fixing the needle body. UTILITY MODEL CONTENTS

[0006] The utility model provides a needle holding device, and aims at solving the technical problem that the existing device is inconvenient for clamping and fixing needle bodies of different lengths.

[0007] To solve the above-mentioned technical problems, the utility model adopts the following technical scheme:

[0008] A needle holding device comprises a holding cylinder, a fixing cylinder, a guide assembly, a fixing assembly and a needle core.

[0009] One end of the fixing cylinder is slidably connected in the holding cylinder, and the other end of the fixing cylinder extends outward.

[0010] The inner wall of the fixed cylinder is provided with the guide assembly, the guide assembly comprises a first guide piece and at least one second guide piece, the first guide piece is arranged along the axial direction of the fixed cylinder, the second guide piece is perpendicular to the first guide piece, and the first guide piece and the second guide piece are slidably connected with the fixed assembly,

[0011] The fixed assembly comprises a first connecting rod and at least one second connecting rod which are hingedly connected at the ends, and the other ends of the first connecting rod and the second connecting rod are slidably connected with the first guide piece and the second guide piece respectively,

[0012] The needle core is movably arranged in the inside of the holding cylinder and the fixed cylinder, when the needle core is clamped, the needle core inwardly extrudes the first connecting rod to reduce the included angle between the first connecting rod and the second connecting rod, so that the needle core is clamped.

[0013] In the utility model, it is necessary to explain that the inside of the fixed cylinder is provided with a rectangular cavity, the first guide piece and the second guide piece can be any one of a sliding groove or a sliding rail, the first guide piece and the second guide piece are arranged on the inside side wall of the rectangular cavity, in addition, after the needle core is inserted into the device, the needle core, the holding cylinder and the fixed cylinder are in the coaxial state, therefore the position of the fixed assembly and the needle core are matched in the utility model, specifically, the position of the first connecting rod can make the needle core contact and extrude the first connecting rod after being inserted;

[0014] In the utility model, it is also necessary to explain that the moving direction of the first connecting rod is consistent with the direction of the first guide piece, when the needle core is inserted into the holding cylinder and the fixed cylinder, the tail end of the needle core will extrude the first connecting rod, so that the first connecting rod moves inwardly along the first guide piece, and since the first connecting rod is hingedly connected with one end of the second connecting rod and the other end of the second connecting rod is hingedly connected with the second guide piece, during the inward movement of the first connecting rod, the first connecting rod will pull the second connecting rod, so that the second connecting rod slides downwardly on the second guide piece, so that the included angle between the first connecting rod and the second connecting rod becomes smaller, until the needle core is clamped, the clamping of the needle core is realized through the linkage of the first connecting rod and the second connecting rod, which is convenient to operate and high in efficiency.

[0015] Preferably, the first guide piece and the second guide piece are a first sliding groove and a second sliding groove respectively,

[0016] The fixed assembly further comprises a first sliding block and a second sliding block, the first sliding block is slidably arranged in the first sliding groove, one end of the first connecting rod is connected with the side wall of the first sliding block, the second sliding block is slidably arranged in the second sliding groove, and one end of the second connecting rod is hingedly connected with the second sliding block.

[0017] In the utility model, the linkage of the first connecting rod and the second connecting rod is realized by the groove and block structure, compared with the slide rail and block structure, the groove and block structure is more compact and reduces the weight of the device, in addition, the first connecting rod is fixedly connected with the first block, the lower part of the first block is arranged in the first groove, the upper part of the first block extends outward and the height is increased, the upper extension part abuts against the needle core, since the upper section of the first block is enlarged, the tail end of the needle core is more easily contacted.

[0018] Preferably, the second groove is provided with the second block, and the second groove is perpendicular to the first groove,

[0019] The second connecting rod is provided with the second block, and the second groove is perpendicular to the first groove,

[0020] In the utility model, in order to more stably clamp the tail end of the needle core, two second grooves are arranged, two second connecting rods and two second blocks are correspondingly arranged, so that when the needle core continuously inserts and extrudes the first block inward, the first connecting rod simultaneously pulls the second connecting rods on the two sides, the second connecting rods drive the second blocks to move downward, so that the tail end of the needle core is clamped on the two sides simultaneously, the clamping effect is better and more stable.

[0021] Further, the opposite sides of the two second blocks are provided with connecting rods, the connecting rods are connected with pressing blocks, and grooves are arranged on the surfaces of the pressing blocks in the axial direction of the fixed cylinder.

[0022] In the utility model, the connecting rod is S-shaped, when the connecting rod is connected with the pressing block, the grooves on the pressing block correspond to the positions of the needle core, so that the needle core is clamped between the two grooves during clamping, and the clamping effect is enhanced.

[0023] Further, a limiting hole is arranged on the side wall of the fixed cylinder, the limiting hole is arranged in the axial direction of the fixed cylinder, a connecting hole is arranged on the first block, a second bolt is movably arranged in the limiting hole, one end of the second bolt is screwed into the limiting hole and the connecting hole, and the other end of the second bolt extends outward.

[0024] In the utility model, the second bolt is used for fixing the first block, when the operator inserts the needle core, if the needle core is clamped and fixed, if the needle core is continuously moved inward, the needle core cannot be continuously moved, the second bolt is tightened, the first block is limited by the second bolt, the included angle between the first connecting rod and the second connecting rod is limited, and fixing is realized.

[0025] Further, the holding cylinder is provided with a connecting piece, a first bolt is threadedly connected in the connecting piece, and the first bolt abuts against the fixing cylinder through the side wall of the holding cylinder.

[0026] In the utility model, the position of the slidable fixing cylinder in the holding cylinder is adapted to needle cores of different lengths or adjusts the exposed length of the front end of the needle core, thereby improving the adaptability of the utility model.

[0027] Preferably, an auxiliary fixing ring is arranged inside the holding cylinder, the auxiliary fixing ring can pass through the side wall of the fixing cylinder and extend into the fixing cylinder, and the needle core is arranged in the fixing ring.

[0028] In the utility model, the auxiliary fixing ring has the effect of guiding and auxiliary fixing, the needle core is inserted into the holding cylinder and the fixing cylinder through the auxiliary fixing ring, on the one hand, the auxiliary fixing ring limits the swing of the needle core during the operation of the operator, thereby increasing the operation precision, and on the other hand, after the needle core passes through the auxiliary fixing ring, the needle tail is opposite the center position of the first sliding block, thereby making the first sliding block more convenient to slide.

[0029] Further, one end surface of the fixing cylinder is provided with a through hole, and the diameter of the through hole is greater than the diameter of the fixing ring.

[0030] In the utility model, the length of the auxiliary fixing ring is increased to increase the matching length with the needle core, thereby further limiting the swing of the needle core and improving the insertion precision.

[0031] Preferably, sealing rings are arranged on the inner wall of the holding cylinder and the outer wall of the fixing cylinder, thereby increasing the stability of the fixing cylinder when being static or sliding.

[0032] The surface of the groove is covered with rubber, and in addition, the surface of the groove can be provided with a structure such as a pattern for increasing friction, which is not limited herein.

[0033] The use steps of the utility model are as follows:

[0034] Inserting the needle core: firstly, the position of the fixing cylinder is fixed by tightening the first bolt, at this time, the insertion length of the needle core is also determined, and the needle core is inserted into the holding cylinder and the fixing cylinder through the auxiliary fixing ring;

[0035] Fixing the needle core: when the tail end of the needle core contacts the first sliding block, the needle core is continuously inserted, at this time, the needle core will extrude the first sliding block, the first sliding block starts to slide inwards along the first sliding groove, the first connecting rod moves inwards, the first connecting rod moves inwards to simultaneously pull the second connecting rods on both sides, the second connecting rods drive the second sliding blocks to move downwards, thereby driving the connecting rods and the pressing blocks on both sides to simultaneously clamp the tail of the needle core, at this time, if the needle core is continuously moved inwards, obvious resistance will be generated, the needle core will not be continuously moved, at this time, the second bolt is tightened, the second bolt limits the movement of the first sliding block, thereby limiting the included angle between the first connecting rod and the second connecting rod, and fixing is realized.

[0036] Adjustment of the fixed tube: after loosening the first bolt, the fixed tube can be slid, and the length of the needle core or the length of the needle core exposed can be adjusted accordingly, and after adjustment, the first bolt is tightened.

[0037] In the operation process of the utility model, the operator can operate after holding the holding cylinder after adjusting and fixing the needle core.

[0038] As the above technical scheme is adopted, the utility model has the beneficial effects that:

[0039] 1. The utility model provides a needle holding device and operation device, through setting guiding component and fixed component, when the needle core is inserted into the holding cylinder and the fixed cylinder, the tail end of the needle core will extrude the first connecting rod, so that the first connecting rod moves inward along the first guide piece, in the inward movement process of the first connecting rod, the first connecting rod will pull the second connecting rod, and the second connecting rod slides downward on the second guide piece, so that the included angle between the first connecting rod and the second connecting rod becomes smaller, until the needle core is clamped.

[0040] 2. The utility model provides a needle holding device and operation device, through setting two second sliding grooves, two second connecting rods and two second sliding blocks are correspondingly arranged, so when the needle core continuously inserts and extrudes the first sliding block inward, the first connecting rod will pull the second connecting rods on both sides, so that the second connecting rods drive the second sliding blocks to move downward, so that the needle core tail is clamped on both sides at the same time, and the clamping effect is better and more stable.

[0041] 3. The utility model provides a needle holding device and operation device, through setting the first bolt, the position of the slidable fixed cylinder in the holding cylinder can be adapted to needle cores of different lengths or adjust the length of the needle core exposed at the front end, so that the adaptability of the utility model is improved.

[0042] 4. The utility model provides a needle holding device and operation device, through setting the auxiliary fixing ring, on the one hand, the auxiliary fixing ring can limit the swing of the needle core during the operation of the operator, and the operation precision is improved, and on the other hand, after the needle core passes through the auxiliary fixing ring, the needle tail will be opposite to the center position of the first sliding block, so that the first sliding block is more convenient to slide. DRAWINGS

[0043] The utility model will be explained by examples and with reference to the drawings, wherein:

[0044] Figure 1 It is the utility model sectional view;

[0045] Figure 2 It is the utility model fixed cylinder sectional view;

[0046] Figure 3The utility model discloses a fixed assembly structure schematic view.

[0047] Figure 4 The utility model discloses a holding cylinder sectional view.

[0048] Figure 5 The utility model discloses a fixed cylinder structure schematic view.

[0049] Signs:

[0050] 1-holding cylinder, 101-limiting plate, 102-sealing ring, 2-fixed cylinder, 3-needle core, 4-slotted group, 401-first slotted, 402-second slotted, 5-fixed assembly, 501-first connecting rod, 502-second connecting rod, 503-first sliding block, 504-second sliding block, 505-connecting rod, 506-pressing block, 6-first bolt, 7-connecting piece, 8-through hole, 9-connecting hole, 10-second fixed bolt. DETAILED DESCRIPTION

[0051] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application and the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and indicated in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0052] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility product is used, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0053] The embodiments of the present application will be described below in conjunction with Figures 1-5 The utility model will be described in detail.

[0054] Embodiment 1

[0055] A needle holding device, such as Figures 1-5As shown, including holding cylinder 1, fixed cylinder 2, guide assembly 4, fixed assembly 5 and needle core 3,

[0056] The fixed cylinder 2 is slidably connected to the holding cylinder 1 at one end, and the other end of the fixed cylinder 2 extends outward,

[0057] The inner wall of the fixed cylinder 2 is provided with the guide assembly 4, the guide assembly 4 includes a first guide and at least one second guide, the first guide is arranged along the axial direction of the fixed cylinder 2, the second guide is perpendicular to the first guide, the first guide and the second guide are slidably connected with the fixed assembly 5,

[0058] The fixed assembly 5 includes a first link 501 and at least one second link 502, the other end of the first link 501 and the second link 502 is respectively slidably connected with the first guide and the second guide,

[0059] The needle core 3 is movably arranged inside the holding cylinder 1 and the fixed cylinder 2, when clamping the needle core 3, the needle core 3 inwardly extrudes the first link 501 to reduce the included angle of the first link 501 and the second link 502, thereby clamping the needle core 3.

[0060] The first guide and the second guide are respectively a first sliding groove 401 and a second sliding groove 402.

[0061] The fixed assembly 5 further includes a first sliding block 503 and a second sliding block 504, the first sliding block 503 is slidably arranged in the first sliding groove 401, one end of the first link 501 is connected with the side wall of the first sliding block 503, the second sliding block 504 is slidably arranged in the second sliding groove 402, one end of the second link 502 is hinged with the second sliding block 504.

[0062] The inner wall of the holding cylinder 1 and the outer wall of the fixed cylinder 2 are both provided with a sealing ring, which increases the stability of the fixed cylinder 2 when it is stationary and slides.

[0063] In the embodiment, the moving direction of the first connecting rod 501 is consistent with the direction of the first guide, when the needle core 3 is inserted into the holding cylinder 1 and the fixed cylinder 2, the tail end of the needle core 3 will press the first connecting rod 501, so that the first connecting rod 501 moves inward along the first guide, and since the first connecting rod 501 is hinged at one end of the second connecting rod 502, the other end of the second connecting rod 502 is hinged with the second guide, therefore, during the inward movement of the first connecting rod 501, the first connecting rod 501 will pull the second connecting rod 502, so that the second connecting rod 502 slides downward on the second guide, so that the included angle between the first connecting rod 501 and the second connecting rod 502 becomes smaller, until the needle core 3 is clamped, the clamping of the needle core 3 is realized through the linkage of the first connecting rod 501 and the second connecting rod 502, which is convenient to operate and high in efficiency.

[0064] Embodiment 2

[0065] The difference between the embodiment and the embodiment 1 is that the second sliding groove 402 is provided as two, the two second sliding grooves 402 are respectively arranged on the upper and lower sides of the first sliding groove 401 close to one end of the holding cylinder 1, the second sliding block 504 is arranged in each of the two second sliding grooves 402, and the two second sliding grooves 402 are perpendicular to the first sliding groove 401,

[0066] The second connecting rod 502 is provided as two, the two second connecting rods 502 are respectively arranged on the two sides of the first connecting rod 501, and the ends of the two second connecting rods 502 away from the second sliding groove 402 are respectively hinged with the ends of the first connecting rod 501 away from the second sliding groove 402.

[0067] The opposite sides of the two second sliding blocks 504 are respectively provided with connecting rods 505, the connecting rods 505 are connected with pressing blocks 506, and the surface of the pressing block 506 is provided with a groove in the axial direction of the fixed cylinder 2.

[0068] The surface of the groove is covered with rubber.

[0069] The side wall of the fixed cylinder 2 is provided with a limiting hole 201, the limiting hole 201 is arranged in the axial direction of the fixed cylinder 2, the first sliding block 503 is provided with a connecting hole 9 penetrating therethrough, the second bolt is movably arranged in the limiting hole 201, one end of the second bolt penetrates through the limiting hole 201 and is threadedly connected with the connecting hole 9, and the other end of the second bolt extends outward.

[0070] In the embodiment, in order to more stably clamp the tail end of the needle core 3, two second sliding grooves 402 are arranged, two second connecting rods 502 and two second sliding blocks 504 are arranged correspondingly, so that when the needle core 3 is continuously inserted and pressed to the first sliding block 503, the first connecting rod 501 simultaneously pulls the two second connecting rods 502, the second connecting rod 502 drives the second sliding block 504 to move downward, so that the two recesses simultaneously clamp the tail of the needle core 3, and the clamping effect is better and more stable.

[0071] In the embodiment, the second bolt is used for fixing the first sliding block 503, when the operator inserts the needle core 3, if the needle core 3 is clamped and fixed, if the needle core 3 is continuously moved inward, the needle core 3 cannot be continuously moved, at this time, the second bolt is tightened, the second bolt limits the movement of the first sliding block 503, so as to limit the included angle between the first connecting rod 501 and the second connecting rod 502, and fixing is realized.

[0072] Embodiment 3

[0073] The difference between the embodiment and the embodiment 2 is that the holding barrel 1 is provided with a connecting piece 7, the first bolt 6 is threadedly connected in the connecting piece 7, and the first bolt 6 penetrates through the side wall of the holding barrel 1 and abuts against the fixing barrel 2.

[0074] In the embodiment, the slidable fixing barrel 2 is located in the holding barrel 1, and the position is adapted to needle cores 3 of different lengths or adjusts the exposed length of the front end of the needle core 3, and the adaptability of the utility model is improved.

[0075] Embodiment 4

[0076] The difference between the embodiment and the embodiment 3 is that the holding barrel 1 is internally provided with an auxiliary fixing ring 101, the auxiliary fixing ring 101 can penetrate through the side wall of the fixing barrel 2 and extend to the inside of the fixing barrel 2, and the needle core 3 is arranged in the fixing ring.

[0077] One end surface of the fixing barrel 2 is provided with a through hole 8, and the diameter of the through hole 8 is greater than the diameter of the fixing ring.

[0078] In the embodiment, the auxiliary fixing ring 101 plays a guiding and auxiliary fixing effect, the needle core 3 is inserted into the holding barrel 1 and the fixing barrel 2 through the auxiliary fixing ring 101, on one hand, the auxiliary fixing ring 101 limits the swing of the needle core 3 in the operation process of the operator, and the operation precision is increased, and on the other hand, after the needle core 3 passes through the auxiliary fixing ring 101, the needle tail is opposite to the center position of the first sliding block 503, so that the first sliding block 503 is more convenient to slide.

[0079] The use steps of the utility model are as follows:

[0080] Inserting needle core 3: first, tighten the first bolt 6 to fix the position of the fixed cylinder 2, at this time the insertion length of the needle core 3 will also be determined, insert the needle core 3 into the holding cylinder 1 and the fixed cylinder 2 through the auxiliary fixing ring 101;

[0081] Fixing of needle core 3: when the tail end of the needle core 3 contacts the first sliding block 503, continue to insert the needle core 3 inward, at this time the needle core 3 will extrude the first sliding block 503, the first sliding block 503 will start to slide inward along the first sliding groove 401, the first connecting rod 501 will move inward, the first connecting rod 501 will move inward at the same time, the second connecting rod 502 on both sides will be pulled, the second connecting rod 502 will drive the second sliding block 504 to move downward, thereby driving the connecting rod 505 and the pressing block 506 on both sides to clamp the tail of the needle core 3 at the same time, at this time if the needle core 3 is continuously moved inward, it will be obviously hindered, the needle core 3 will not be able to continue to move, at this time the second bolt is tightened, the second bolt limits the movement of the first sliding block 503, thereby limiting the included angle between the first connecting rod 501 and the second connecting rod 502, and the fixing is realized.

[0082] Adjustment of fixed tube: after loosening the first bolt 6, the fixed tube can be slid, the length of the needle core 3 or the length of the needle core 3 exposed in front can be adjusted accordingly, and after adjusting, the first bolt 6 is tightened again.

[0083] In the operation process of the utility model, the operator can operate after holding the holding cylinder 1 after adjusting and fixing the needle core 3.

[0084] The above description of the disclosed embodiments enables those skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A needle-holding device, characterized in that The utility model relates to a needle cartridge, which comprises a holding cylinder (1), a fixing cylinder (2), a guide assembly (4), a fixing assembly (5) and a needle core (3), One end of the fixing cylinder (2) is slidably connected to the holding cylinder (1), and the other end of the fixing cylinder (2) extends outward, The inner wall of the fixing cylinder (2) is provided with the guide assembly (4), the guide assembly (4) comprises a first guide and at least one second guide, the first guide is arranged along the axial direction of the fixing cylinder (2), the second guide is perpendicular to the first guide, and the first guide and the second guide are slidably connected with the fixing assembly (5), The fixing assembly (5) comprises a first connecting rod (501) and at least one second connecting rod (502) which are hingedly connected at their ends, and the other ends of the first connecting rod (501) and the second connecting rod (502) are slidably connected with the first guide and the second guide respectively, The needle core (3) is movably arranged in the holding cylinder (1) and the fixing cylinder (2), when the needle core (3) is clamped, the needle core (3) inwardly extrudes the first connecting rod (501), so that the included angle between the first connecting rod (501) and the second connecting rod (502) is reduced, thereby clamping the needle core (3).

2. A needle-holding device according to claim 1, characterized in that: The first guide and the second guide are a first sliding groove (401) and a second sliding groove (402) respectively, The fixing assembly (5) further comprises a first sliding block (503) and a second sliding block (504), the first sliding block (503) is slidably arranged in the first sliding groove (401), one end of the first connecting rod (501) is connected with the side wall of the first sliding block (503), the second sliding block (504) is slidably arranged in the second sliding groove (402), and one end of the second connecting rod (502) is hingedly connected with the second sliding block (504).

3. A needle-holding device according to claim 2, wherein: The second sliding groove (402) is provided with two second sliding blocks (504), and the second sliding groove (402) is perpendicular to the first sliding groove (401), The second connecting rod (502) is provided with two second connecting rods (502), and the second connecting rod (502) is hingedly connected with the first connecting rod (501) at the end away from the second sliding groove (402).

4. A needle-holding device according to claim 2, characterized in that: The opposite sides of the second sliding block (504) are provided with connecting rods (505), the connecting rods (505) are connected with pressing blocks (506), and the surface of the pressing block (506) is provided with a groove along the axial direction of the fixing cylinder (2).

5. A needle-holding device according to claim 2, characterized in that: The fixed cylinder (2) side wall is provided with a limiting hole (201), the limiting hole (201) is arranged along the fixed cylinder (2) axial direction, the first slider (503) is provided with a connecting hole (9) penetratingly, the second bolt is movably arranged in the limiting hole (201), one end of the second bolt is screwed with the connecting hole (9) through the limiting hole (201), and the other end of the second bolt extends outward.

6. A needle-holding device according to any one of claims 1-5, characterized in that: The holding cylinder (1) is provided with a connecting piece (7), the first bolt (6) is screwedly connected in the connecting piece (7), and the first bolt (6) abuts against the fixed cylinder (2) through the side wall of the holding cylinder (1).

7. A needle-holding device according to any one of claims 1-5, characterized in that: The holding cylinder (1) is internally provided with an auxiliary fixing ring (101), the auxiliary fixing ring (101) can pass through the side wall of the fixed cylinder (2) and extend into the fixed cylinder (2), and the needle core (3) is arranged in the fixed ring.

8. A needle-holding device according to claim 7, characterized in that: One end surface of the fixed cylinder (2) is provided with a through hole (8), and the diameter of the through hole (8) is greater than the diameter of the fixed ring.

9. A needle-holding device according to any one of claims 1-5, characterized in that: The inner wall of the holding cylinder (1) and the outer wall of the fixed cylinder (2) are both provided with a sealing ring.

10. A needle-holding device according to claim 4, characterized in that: The groove surface is covered with rubber.

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