CN212439615U

CN212439615U - Pre-setting syringe

Info

Publication number: CN212439615U
Application number: CN202020258976.XU
Authority: CN
Inventors: 倪世利; 杨宝昆; 吴伟东; 温鹏晖; 许述才
Original assignee: Shandong Weigao Prefills Pharmaceutical Packaging Co Ltd
Current assignee: Shandong Weigao Prefills Pharmaceutical Packaging Co Ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2021-02-02
Anticipated expiration: 2030-03-05

Abstract

The utility model discloses a preset volume syringe belongs to medical instrument technical field, and this preset volume syringe includes injection tube and push rod, is provided with the scale along length direction on the push rod, still includes the regulator, and the regulator is provided with a plurality of location teeth along push rod length direction sliding connection in the push rod periphery, the push rod outside along length direction, and the regulator is equipped with the buckle that is used for with location tooth activity joint, and the regulator is equipped with the spacing portion that is used for with the spacing joint of tail end of injection tube. This product can be through the injection volume of sliding adjuster convenience, accurate minute injection of adjusting, avoids the injection volume to take place to big or the condition of littleer partially, and the injection in-process, medical personnel only need pay close attention to injection speed, need not to spend energy to pay close attention to the scale, consequently, this scheme can improve the injection quality greatly.

Description

Pre-setting syringe

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a preset volume syringe.

Background

In clinical applications, a syringe is used to inject a medical fluid into a patient. In clinical injection, the liquid medicine in the syringe is often required to be injected in several times.

The existing injector needs an operator to control the injection amount according to the scales on the needle cylinder, and needs to be clamped by fingers and pushed by a large force, the operator needs to pay attention to the scales and the clamping force at the same time, and the situation of larger or smaller injection amount is easy to occur, so that the phenomena of over-treatment and insufficient treatment are caused.

Therefore, how to perform the fractional quantitative injection more conveniently and accurately is a technical problem that needs to be solved by those skilled in the art at present.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a preset volume injector, which can make medical personnel perform volume injection more conveniently and accurately, and improve injection quality.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a preset quantitative syringe, includes injection tube and push rod, be provided with the scale along length direction on the push rod, still include the regulator, the regulator is followed push rod length direction sliding connection in the push rod periphery, the push rod outside is provided with a plurality of location teeth along length direction, the regulator be equipped with be used for with the buckle of location tooth activity joint, the regulator be equipped with be used for with the spacing portion of the spacing joint of tail end of injection tube.

Preferably, the regulator is provided with an elastic shifting sheet for controlling the buckle to be clamped and separated from the positioning teeth.

Preferably, a shifting piece deflector rod is arranged on the outer side of the elastic shifting piece.

Preferably, a side end surface of the positioning tooth facing the handle end of the push rod is a first passing surface, a side end surface of the positioning tooth facing the piston end of the push rod is a first non-return surface, a side end surface of the buckle facing the piston end of the push rod is a second passing surface, a side end surface of the buckle facing the handle end of the push rod is a second non-return surface, the first passing surface and the second passing surface are both inclined to the piston end of the push rod in a direction extending radially outward of the push rod, and the first non-return surface and the second non-return surface are both inclined to the piston end of the push rod in a direction extending radially outward of the push rod or are both perpendicular to an axis of the push rod.

Preferably, a rotation limiting part for limiting the rotation of the adjuster around the axis of the push rod relative to the push rod is arranged between the push rod and the adjuster.

Preferably, the main body of the push rod comprises a plurality of elongated rib plates, the length direction of the plurality of rib plates extends along the length direction of the push rod, the plurality of rib plates are radially arranged around the axis of the push rod, and the adjuster is provided with at least one guide rail which is in sliding fit with the rib plates along the length direction.

Preferably, the positioning teeth are arranged on the outer side edge of at least one rib plate.

Preferably, the scale is arranged on the side surface of at least one rib plate.

Preferably, the adjuster is an adjusting cylinder sleeved on the periphery of the push rod, and the equivalent diameter of the outer ring of the adjusting cylinder is larger than the inner diameter of the injection cylinder.

Preferably, the range of the scale is greater than or equal to the nominal capacity of the syringe.

The utility model provides a preset volume syringe's application method does:

firstly, the liquid medicine is contained in the injection tube by a pre-encapsulation mode or a mode of sucking the liquid medicine when in use, then the regulator slides to the designated scale along the push rod and is clamped and positioned by the buckle and the positioning tooth, at the moment, a section of injection distance is reserved between the limiting part of the regulator and the injection tube, then injection is carried out, and the regulator moves along with the push rod in the injection process. When the spacing portion of regulator and the spacing joint of the tail end of injection tube, the push rod can't continue to impel, at this moment, has accomplished the first time quantitative injection. When needs quantitative injection once more, make the buckle break away from the positioning tooth to make the regulator can slide along the push rod, then slide the regulator to the appointed scale department of quantitative injection of second time, again with buckle and positioning tooth joint location, at this moment, leave the distance of secondary injection again between the spacing portion of regulator and the injection tube, then can carry out quantitative injection of second time, when regulator and injection tube spacing joint once more, the push rod can not continue to impel, accomplish quantitative injection of second time promptly. By analogy, more quantitative injections can be performed until the whole injection process is completed.

This product can be through the injection volume of sliding adjuster convenience, accurate minute injection of adjusting, avoids the injection volume to take place to big or the condition of littleer partially, and the injection in-process, medical personnel only need pay close attention to injection speed, need not to spend energy to pay close attention to the scale, consequently, this scheme can improve the injection quality greatly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the internal structure of a pre-set-volume syringe according to an embodiment of the present invention;

fig. 2 is a partially enlarged view of a portion a in fig. 1;

FIG. 3 is a side view of a regulator in an embodiment of the present invention;

fig. 4 is a schematic perspective view of an adjuster according to an embodiment of the present invention;

FIG. 5 is a longitudinal cross-sectional view of a regulator in an embodiment of the present invention;

fig. 6 is a schematic perspective view of a preset volume syringe according to an embodiment of the present invention;

FIG. 7 is a front view of a preset volume injector in an embodiment of the present invention;

fig. 8 is a top view of a pre-set volume syringe in an embodiment of the invention.

In fig. 1 to 8:

1-injection cylinder, 2-piston, 3-push rod, 4-regulator, 5-rib plate, 6-scale, 7-positioning tooth, 41-buckle, 42-spacing part, 43-elastic shifting piece, 44-shifting piece deflector rod, 45-baffle and 46-guide rail.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 8, fig. 1 is a schematic view of an internal structure of a preset-amount injector according to an embodiment of the present invention; fig. 2 is a partially enlarged view of a portion a in fig. 1; fig. 3 to 4 are a side view, a schematic perspective view and a longitudinal sectional view of an adjuster according to an embodiment of the present invention; fig. 6 to 8 are a schematic perspective view, a front view and a top view of a preset-amount injector according to an embodiment of the present invention.

The utility model provides a preset quantitative syringe, including injection tube 1 and push rod 3, push rod 3 is located 1 inside one end of injection tube and installs piston 2, is provided with scale 6 along length direction on the push rod 3, still includes

regulator

4, 3 length direction sliding connection in the 3 peripheries of push rod are followed to

regulator

4, 3 outsides of push rod are provided with a plurality of location teeth 7 along length direction, regulator 4 is equipped with the buckle 41 that is used for with 7 activity joints of location tooth, regulator 4 is equipped with the spacing portion 42 that is used for with the spacing joint of tail end of injection tube 4.

The utility model provides a preset volume syringe's application method does:

firstly, the liquid medicine is contained in the injection tube 1 by a pre-filling and sealing mode or a mode of sucking the liquid medicine when in use, then the regulator 4 slides to a designated scale along the push rod 3 and is clamped and positioned by the buckle 41 and the positioning teeth 7, at the moment, a section of injection distance is reserved between the limiting part 42 of the regulator 4 and the injection tube 1, then injection is carried out, and the regulator 4 moves along with the push rod 3 in the injection process. When the limiting part 42 of the regulator 4 is in limiting clamping connection with the tail end of the injection tube 1, the push rod 3 cannot be pushed continuously, and at the moment, the first quantitative injection is completed. When needs quantitative injection once more, make buckle 41 break away from location tooth 7 to make regulator 4 can slide along push rod 3, then slide regulator 4 to the appointed scale department of second quantitative injection, again with buckle 41 and location tooth 7 joint location, at this moment, the distance of second injection is left again between spacing portion 42 of regulator 4 and injection tube 1, then can carry out second quantitative injection, when regulator 4 and injection tube 1 spacing joint once more, push rod 3 can not continue to advance, accomplish second quantitative injection promptly. By analogy, more quantitative injections can be performed until the whole injection process is completed.

It should be noted that the function of the regulator 4 is to provide a quantitative reference structure for the injector during quantitative injection, and the regulator 4 can pre-regulate the dose of the current injection, so as to ensure that the position of the push rod 3 and the injection tube 1 is fixed after the current injection. The buckle 41 is a structure that is directly limited and clamped with the positioning teeth 7, when the buckle 41 is clamped with the positioning teeth 7, the relative position of the regulator 4 and the push rod 3 is fixed, so that quantitative limitation can be realized by using the limiting part 42 of the regulator 4 when the next quantitative injection is finished, and when the buckle 41 is separated from the positioning teeth 7, the regulator 4 can slide back and forth on the push rod 3, so that the dosage can be predetermined before the next quantitative injection. It should be noted that the buckle 41 can be movably clamped with the positioning teeth 7 through various structural forms, for example, the clamping of the buckle 41 on and off is controlled through an elastic sheet, or the movable clamping of the buckle 41 with the positioning teeth 7 is realized through a structure of a movable latch, or the buckle 41 is controlled through a structure of a positioning clip, and so on. Preferably, the regulator 4 in this solution is provided with an elastic pick 43 for controlling the catch 41 to engage and disengage the positioning teeth 7, as shown in fig. 2. When the regulator 4 needs to be moved, the buckle 41 can be separated from the positioning teeth 7 only by manually shifting the elastic shifting piece 43, so that the operation is convenient. After releasing the elastic pulling piece 43, the elastic pulling piece 43 is restored to the initial state, i.e. the catch 41 is snapped onto the positioning tooth 7.

Further preferably, in order to facilitate manual shifting of the elastic shifting piece 43, the shifting piece shifting rod 44 is disposed outside the elastic shifting piece 43. The medical staff can lift the elastic shifting piece 43 by shifting the shifting piece shifting lever 44 by hand, so that the buckle 41 is separated from the positioning teeth 7.

Preferably, a side end surface of the positioning tooth 7 facing the handle end of the push rod 3 is a first passing surface, a side end surface of the positioning tooth 7 facing the piston end of the push rod 3 is a first non-return surface, a side end surface of the buckle 41 facing the piston end of the push rod 3 is a second passing surface, a side end surface of the buckle 41 facing the handle end of the push rod 3 is a second non-return surface, the first passing surface and the second passing surface are both inclined to the piston end of the push rod 3 in a direction extending radially outward along the push rod 3, and the first non-return surface and the second non-return surface are both inclined to the piston end of the push rod 3 in a direction extending radially outward along the push rod 3 or are both perpendicular to an axis of the push rod 3. With this arrangement, the positioning teeth 7 and the catches 41 are designed as one-way locking teeth, so as to facilitate pushing the actuator 4 to a position close to the plunger end of the push rod 3 before the first injection, and when the actuator 4 slides relative to the push rod 3 from the stem end to the plunger end of the push rod 3, the second passing surface of the catch 41 and the first passing surface of the positioning teeth 7 are pressed against each other, and the pressing surface is inclined from the stem end to the plunger end, so that the pressing force will form a radially outward component force on the catch 41, which can lift the catch 41, thereby easily passing over the positioning teeth 7. After finishing a quantitative injection, the regulator 4 needs to be firmly fixed on the push rod 3 to ensure a quantitative accuracy, and at this time, because the first non-return surface of the positioning tooth 7 is abutted against the second non-return surface of the buckle 41, and the extrusion force generated at the abutted position does not generate a radially outward component force to the buckle 41, the buckle 41 does not break away from the positioning tooth 7 under the extrusion action, thereby ensuring an effective clamping limit.

Preferably, a rotation limiting part for limiting the rotation of the adjuster 4 around the axis of the push rod 3 relative to the push rod 3 is arranged between the push rod 3 and the adjuster 4. So set up, just can utilize and rotate spacing portion and prevent the relative rotation between regulator 4 and push rod 3 to avoid relative rotation to influence the accurate positioning of quantitative injection. It should be noted that the rotation limiting part may be designed in various structural forms, for example, the push rod 3 is designed as a fin-shaped structure, and the adjuster 4 is designed as a snap ring structure matched with the fin-shaped structure, and the relative rotation is prevented by the circumferential limiting and clamping of the two; or, an axial guide bar structure is designed on the surface of the push rod 3, and a guide groove structure which is matched with the guide bar structure in the circumferential direction is designed on the adjuster 4, so that the guide bar and the guide groove are prevented from rotating relatively by the sliding fit; or, the push rod 3 is designed to be a cylindrical structure with a square, triangular or other non-circular cross section, and the adjuster 4 is in sliding fit with the push rod 3, so that the purpose of preventing the relative rotation of the two can be achieved, and the like.

Referring to fig. 1 and 4, preferably, the main body of the push rod 3 includes a plurality of elongated rib plates 5, the plurality of rib plates 5 are arranged in a manner of extending along the length direction of the push rod 3, the plurality of rib plates 5 are arranged in a manner of radiating around the axis of the push rod 3, and the adjuster 4 is provided with at least one guide rail 46 in sliding fit with the rib plates 5 along the length direction. The number of the rib plates 5 can be three, four or more, one or more guide rails 46 can be designed, four rib plates 5 are preferably adopted in the scheme, the main body of the push rod 3 is designed into a cross rib shape, the guide rails 46 are matched with the cross ribs, the strength and the rigidity of the push rod 3 can be further improved, the linear edges of the rib plates 5 can be further clamped with the guide rails 46 of the adjuster 4 in the circumferential direction, and therefore the purpose of preventing the push rod 3 and the adjuster 4 from rotating relative to each other is achieved.

It should be noted that the positioning teeth 7 may be designed on the surface of the push rod 3, and preferably, when the push rod 3 adopts the rib structure, the positioning teeth 7 are arranged on the outer edge of at least one rib 5, as shown in fig. 1 and 7.

Preferably, scale 6 sets up in the side of at least one gusset 5, is convenient for medical personnel to observe the injection volume, still makes things convenient for medical personnel to slide regulator 4, fixes a position regulator 4 according to scale 6 is accurate.

Preferably, the scale 6 has a range equal to or greater than the nominal capacity of the syringe 1. So set up, just can guarantee that regulator 4 is accurate ration in the nominal capacity within range of syringe 1, promptly, realize quantitative injection with all liquid medicines in syringe 1, avoid 6 measuring ranges of scale unable ration when not enough.

It should be noted that the adjuster 4 in the present embodiment may be designed in various structural forms, such as a cylindrical structure, an annular structure, or a plate-like structure, and preferably, the adjuster 4 is an adjusting cylinder sleeved on the outer periphery of the push rod 3, and the equivalent diameter of the outer ring of the adjusting cylinder is larger than the inner diameter of the syringe 1. At this time, one side end face of the adjusting cylinder facing the piston end of the push rod 3 is used as the limiting part 42, that is, when one-time quantitative injection is completed, the equivalent diameter of the outer ring of the limiting part 42 of the adjusting cylinder is larger than the inner diameter of the injection tube 1, so as to abut against the tail end of the injection tube 1.

Preferably, the end surface of the adjuster 4 facing the handle end of the push rod 3 is further provided with a baffle 45, and the baffle 45 is provided with notches arranged in one-to-one correspondence with the guide rails 46, so that when the adjuster 4 and the push rod 3 are assembled, because the tail end of the adjuster 4 is blocked by the baffle 45 and only the notch corresponding to the guide rail 46 is left, the rib plate 5 of the push rod 3 can be conveniently aligned with the guide rail 46, and the assembly is easy.

This product can be through the injection volume of sliding adjuster 4 convenience, accurate regulation gradation injection, avoids the injection volume to take place to big or the condition of littleer partially, and the injection in-process, medical personnel only need pay close attention to the injection speed, need not to spend energy attention to the scale, consequently, this scheme can improve the injection quality greatly.

The preset-amount injector provided by the scheme can be designed into a disposable sterile injector or a prefilled syringe and other products, and is not repeated herein.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a preset quantitative syringe, includes injection tube (1) and push rod (3), be provided with scale (6) along length direction on push rod (3), its characterized in that still includes regulator (4), regulator (4) are followed push rod (3) length direction sliding connection in push rod (3) periphery, the push rod (3) outside is provided with a plurality of location teeth (7) along length direction, regulator (4) be equipped with be used for with the buckle of location tooth (7) activity joint, regulator (4) be equipped with be used for with the spacing portion of the spacing joint of tail end of injection tube (1).

2. The pre-set quantity syringe according to claim 1, characterized in that the regulator (4) is provided with an elastic pick for controlling the snap-in engagement and disengagement of the positioning teeth (7).

3. The pre-set dose syringe of claim 2, wherein a dial-up lever is provided outside the resilient dial.

4. The pre-metered syringe as claimed in claim 2, characterized in that the side end face of the positioning tooth (7) facing the plunger end of the plunger (3) is a first passage face, the end surface of one side of the positioning tooth (7) facing to the piston end of the push rod (3) is a first non-return surface, the end surface of one side of the buckle facing the piston end of the push rod (3) is a second through surface, the end surface of one side of the buckle facing the push handle end of the push rod (3) is a second non-return surface, the first and second passage surfaces are each inclined toward the piston end of the push rod (3) in a direction extending radially outward of the push rod (3), the first check surface and the second check surface are inclined towards the piston end of the push rod (3) or are perpendicular to the axis of the push rod (3) in the direction extending outwards along the radial direction of the push rod (3).

5. The pre-set dose syringe according to claim 1, wherein a rotation-limiting portion is provided between the plunger (3) and the actuator (4) for limiting the rotation of the actuator (4) relative to the plunger (3) about the axis of the plunger (3).

6. The preset volume injector according to claim 5, wherein the main body of the push rod (3) comprises a plurality of elongated ribs (5), the length direction of the plurality of ribs (5) extends along the length direction of the push rod (3), the plurality of ribs (5) are arranged radially around the axis of the push rod (3), and the adjuster (4) is provided with at least one guide rail which is in sliding fit with the ribs (5) along the length direction.

7. The pre-set dose syringe according to claim 6, wherein the positioning teeth (7) are provided on the outer edge of at least one rib (5).

8. The pre-set dose syringe according to claim 6, wherein the scale (6) is provided on a side of at least one rib (5).

9. The pre-set quantity syringe according to any of claims 1 to 8, wherein the regulator (4) is an adjusting cylinder sleeved on the outer circumference of the push rod (3), and the equivalent diameter of the outer ring of the adjusting cylinder is larger than the inner diameter of the syringe barrel (1).

10. The pre-metered syringe of claim 1 wherein the scale (6) has a range equal to or greater than the nominal capacity of the syringe barrel (1).