A syringe capable of micro-controlling liquid injection

Abstract

The present invention provides a syringe capable of micro-controllable injection, which belongs to the field of syringes. The syringe comprises a syringe, a piston that moves in the syringe to absorb or squeeze liquid, and a piston rod connected to the piston and used to drive the piston to move in the syringe. The two ends of the syringe are respectively a handheld end and a liquid inlet and outlet end. One end of the piston rod extends from the handheld end into the syringe and is connected to the piston. A handheld portion is provided on the outer wall of the port of the handheld end. The piston rod is rotationally connected to the piston. A conversion structure for controlling the linear or rotational movement of the piston rod is provided on the syringe. The syringe meets the traditional straight-push and pull liquid extraction or injection, and can be converted to a threaded connection mode. Combined with the scale on the syringe, it can effectively realize micro-control of the liquid volume, thereby meeting the use in special injection environments.

Description

Technical Field

[0001] The invention belongs to the technical field of syringes, and in particular relates to a syringe capable of micro-controlling liquid injection. Background Art

[0002] The syringe is a common medical device. The emergence of the syringe is an epoch-making revolution in the field of medical devices. The syringe consists of a syringe with a small hole at the front end and a matching piston core rod. It is used to inject a small amount of liquid or gas into or extract it from areas that are inaccessible by other methods. When the core rod is pulled out, the liquid or gas is sucked from the small hole at the front end of the syringe, and when the core rod is pushed in, the liquid or gas is squeezed out.

[0003] Traditional syringes generally use a straight-line pull to drive the piston in the syringe to achieve the purpose of injection. However, it is difficult to control the manual pulling force and it is difficult to accurately control the liquid volume. In some special injections, liquid volume control is particularly important, and traditional syringes are difficult to meet the needs. Summary of the invention

[0004] The embodiment of the present invention provides a syringe capable of micro-controlling liquid injection, aiming to solve the problems raised in the background technology.

[0005] The embodiment of the present invention is implemented as follows: a syringe capable of micro-controllable injection, the syringe comprising a syringe, a piston moving in the syringe to absorb or squeeze liquid, and a piston rod connected to the piston and used to drive the piston to move in the syringe, the two ends of the syringe are respectively a hand-held end and a liquid inlet and outlet end, one end of the piston rod extends from the hand-held end into the syringe and is connected to the piston, and a hand-held portion is provided on the outer wall of the port of the hand-held end; the piston rod is rotatably connected to the piston;

[0006] The syringe is provided with a conversion structure for controlling the linear movement or rotational movement of the piston rod.

[0007] Preferably, the outer wall of the piston rod has threads;

[0008] The conversion structure includes a positioning tube located at the handheld end;

[0009] The positioning tube comprises a fixing tube located on the handheld end and an elastic part located at one end of the positioning tube away from the syringe, and the inner side of the end of the elastic part away from the positioning tube has a toothed part that can be engaged with the thread.

[0010] The conversion structure also includes a locking sleeve that moves on the positioning tube to tighten or release the elastic part.

[0011] Preferably, the caliber of the end of the locking sleeve close to the syringe is at least smaller than the caliber of the end of the locking sleeve away from the syringe.

[0012] Preferably, movable grooves are symmetrically provided on the outer wall of the positioning tube, and a protrusion that is engaged in the movable groove is provided inside the end of the locking sleeve close to the syringe.

[0013] Preferably, the movable groove spirally extends from an end of the positioning tube close to the syringe to an end of the positioning tube away from the syringe.

[0014] Preferably, the outer wall of the syringe has scales.

[0015] Preferably, the piston rod has a knob at one end away from the piston.

[0016] The syringe meets the traditional straight-push and pull method for extracting or injecting liquid, and can also be converted to a threaded connection mode. Combined with the scale on the syringe, it can effectively achieve micro-control of the liquid volume, thereby meeting the needs of special injection environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a syringe capable of micro-controlling liquid injection;

[0018] Figure 2 It is a schematic diagram of the installation structure of a positioning tube in a syringe capable of micro-controlling liquid injection;

[0019] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of a syringe capable of micro-controlling liquid injection.

[0020] In the figure:

[0021] 1. Syringe;

[0022] 2. Piston;

[0023] 3. Piston rod;

[0024] 4. Handheld part;

[0025] 5. Positioning tube; 51. Fixed tube; 52. Elastic part; 53. Moving groove; 54. Tooth part;

[0026] 6. Lock sleeve; 61. Protrusion;

[0027] 7. Scale;

[0028] 8. Knob. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] The present invention provides a syringe capable of micro-controlling liquid injection, such as Figure 1 , Figure 2 and Figure 3 As shown, the syringe comprises a syringe 1, a piston 2 which moves in the syringe 1 to absorb or squeeze liquid, and a piston rod 3 which is connected to the piston 2 and is used to drive the piston 2 to move in the syringe 1. The two ends of the syringe 1 are a hand-held end and a liquid inlet and outlet end, respectively. One end of the piston rod 3 extends from the hand-held end into the syringe 1 and is connected to the piston 2. A hand-held portion 4 is provided on the outer wall of the port of the hand-held end.

[0031] Different from the prior art, the piston rod 3 is connected to the piston 2 in rotation; the syringe 1 is provided with a conversion structure for controlling the linear movement or rotational movement of the piston rod 3. The conversion structure controls the connection between the piston rod 3 and the syringe 1. When the piston rod 3 moves vertically, the piston rod 3 is directly pushed and pulled to drive the piston 2 to move to absorb or squeeze the liquid. At this time, it is difficult to control the liquid volume; when the conversion structure controls the rotational movement of the piston rod 3, the direct push is converted into a rotational movement, which is convenient for micro-control.

[0032] Specifically, the outer wall of the piston rod 3 has threads;

[0033] The conversion structure includes a positioning tube 5 located at the handheld end;

[0034] The positioning tube 5 includes a fixing tube 51 located on the handheld end and an elastic portion 52 located at an end of the positioning tube 51 away from the syringe 1 . The elastic portion 52 has a tooth portion 54 that can engage with the thread on the inner side of the end away from the positioning tube 51 .

[0035] The conversion structure further includes a locking sleeve 6 that moves on the positioning tube 5 to tighten or release the elastic portion 52 .

[0036] It can be further understood that when sucking or squeezing liquid, when it is necessary to quickly take out or inject liquid, the locking sleeve 6 is moved so that the locking sleeve 6 is close to the syringe 1, releasing the elastic part 52, so that the tooth part 54 is disengaged from the threaded engagement with the piston rod 3, and then the piston rod 3 moves linearly on the syringe 1, driving the piston 2 to move in the syringe 1 to suck or squeeze the liquid; when micro-control is needed, the locking sleeve 6 is moved so that the locking sleeve 6 moves to the elastic part 52, so that the tooth part 54 on the elastic part 52 is engaged in the thread of the piston rod 3, and by rotating the piston rod 3, with the cooperation of the tooth part 54 and the thread, the piston rod 3 is rotated and moved on the syringe 1, thereby driving the piston 2 to move to suck or squeeze the liquid, thereby realizing micro-control.

[0037] Furthermore, in order for the locking sleeve 6 to lock the elastic portion 52 , the tooth portion 54 is engaged with the thread of the piston rod 3 ; the diameter of the end of the locking sleeve 6 close to the syringe 1 is at least smaller than the diameter of the end of the locking sleeve 6 away from the syringe 1 .

[0038] Furthermore, in order to ensure the stability of the locking sleeve 6, the locking sleeve 6 is not affected by the elastic force of the elastic portion 54 when the elastic portion 54 is locked; the outer wall of the positioning tube 51 is symmetrically provided with moving grooves 53, and the end of the locking sleeve 6 close to the syringe 1 is provided with a protrusion 61 that is engaged in the moving groove 53. The moving groove 53 spirally extends from the end of the positioning tube 51 close to the syringe 1 to the end of the positioning tube 51 away from the syringe 1.

[0039] In one embodiment, in order to further achieve micro-control of the liquid volume, a scale 7 is provided on the outer wall of the syringe 1 .

[0040] In this embodiment, when taking out or injecting liquid, the change of the liquid amount in the syringe 1 can be observed through the syringe 1, so as to facilitate the micro-control of the liquid amount.

[0041] In one embodiment, in order to facilitate operation, the piston rod 3 has a knob 8 at one end away from the piston 2 .

[0042] In this embodiment, when taking out liquid and injecting liquid, the knob 8 can be held to pull and pull, and the piston rod 3 can be rotated by the knob 8 to push the piston 2 to move to take out liquid or inject liquid. The knob 8 provides a holding part for the human hand, making the operation of the syringe more convenient.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A syringe capable of micro-controllable injection, comprising a syringe (1), a piston (2) moving in the syringe (1) to absorb or squeeze liquid, and a piston rod (3) connected to the piston (2) and used to drive the piston (2) to move in the syringe (1), wherein the two ends of the syringe (1) are a hand-held end and a liquid inlet and outlet end, respectively, one end of the piston rod (3) extends from the hand-held end into the syringe (1) and is connected to the piston (2), and a hand-held portion (4) is provided on the outer wall of the port of the hand-held end; and the characteristics are as follows: The piston rod (3) is rotatably connected to the piston (2); The syringe (1) is provided with a conversion structure for controlling the linear movement or rotational movement of the piston rod (3); The outer wall of the piston rod (3) is provided with a thread; the conversion structure comprises a positioning tube (5) located at the handheld end; the positioning tube (5) comprises a fixing tube (51) located at the handheld end and an elastic portion (52) located at an end of the fixing tube (51) away from the syringe (1); the inner side of the end of the elastic portion (52) away from the fixing tube (51) comprises a tooth portion (54) that can mesh with the thread; The conversion structure further comprises a locking sleeve (6) which moves on the positioning tube (5) to tighten or release the elastic portion (52); The caliber of the end of the locking sleeve (6) close to the syringe (1) is at least smaller than the caliber of the end of the locking sleeve (6) away from the syringe (1); movable grooves (53) are symmetrically provided on the outer wall of the fixed tube (51), and a protrusion (61) is provided inside the end of the locking sleeve (6) close to the syringe (1) and is engaged with the inside of the movable groove (53).

2. The micro-controllable liquid injection syringe according to claim 1, characterized in that: The movable groove (53) spirally extends from an end of the fixed tube (51) close to the syringe (1) to an end of the fixed tube (51) away from the syringe (1).

3. The micro-controllable injection syringe according to claim 1, characterized in that: The outer wall of the syringe (1) is provided with scales (7).

4. The micro-controllable injection syringe according to claim 1, characterized in that: The piston rod (3) has a knob (8) at one end away from the piston (2).

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