CN218046060U - Double-cavity syringe - Google Patents

Abstract

The utility model discloses a two-chamber syringe includes: the barrel is internally provided with a first stopper, a second stopper and a push rod connected with the second stopper, wherein the first stopper and the second stopper are placed from a far-end opening. The first stopper and the near end of the barrel form a first chamber, the first stopper and the second stopper form a second chamber, and a communicating structure is arranged on the inner wall of the first chamber. When the first stop moves to the communicating structure, the first chamber and the second chamber communicate. The distal end edge of the cylinder is provided with a convex angle projecting toward the central axis direction. The push rod comprises a plurality of fins with overlapped long edges, included angles are formed between every two adjacent fins, at least one notch is formed in the fin along the length direction of the push rod, a baffle located on the upper edge of the notch is arranged between the fin where each notch is located and the included angle of the adjacent fin, and the baffle blocks the push rod to move towards the near end of the barrel when interfering with the convex angle. The improved dual chamber syringe avoids the risk of the pre-filled syringe initiating the drug mixing process due to a malfunction.

Description

Double-cavity syringe

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to two-chamber syringe.

Background

Clinically, the storage form of the drug needs to be determined according to the properties of the drug, for example, for dry heat-sensitive products and substances needing to maintain biological activity, the drug is usually stored in the form of lyophilized powder, and the lyophilized powder is dissolved by a solvent at the moment of injection to form a mixed preparation and then injected. The process of dispensing a medicament is typically: the injection is injected into a medicine bottle storing the freeze-dried powder by the injector to form a mixed preparation which is sucked back into the injector. However, the above-described drug preparation process is cumbersome to operate, and there is a risk of contamination from the outside during the transfer of the drug.

There exist pre-filled syringes with two chambers, the specific structure of which comprises: the drug delivery device comprises a barrel body, a first blocking piece and a second blocking piece, wherein the first blocking piece and the second blocking piece are arranged in the barrel body, the second blocking piece is arranged at the far end of the barrel body and is connected with a push rod, a first cavity for storing a first drug is formed by the first blocking piece and the near end of the barrel body, and a second cavity for storing a second drug is formed between the first blocking piece and the second blocking piece. The inner side wall of the cylinder body is provided with a communicating groove, the push rod applies force to the second blocking piece, so that the first blocking piece is stressed to move to the position of the communicating groove, the two chambers are communicated, and the configuration of the mixed preparation can be completed.

However, in the actual use process of the pre-filled and sealed syringe, the push rod has a risk of misoperation, that is, in the process of transporting and storing the syringe, the push rod touches an external object, so that the first stopper is easy to move, and if the push rod moves to the position of the communicating groove, the preparation process of the mixed preparation is started, and the waste of medicines and medical supplies is caused.

In order to solve the above-mentioned problems of the prior art, there is a need in the art for an improved dual chamber syringe that avoids the risk of a pre-filled syringe that may initiate the drug mixing process due to malfunction.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In order to solve the above technical problems existing in the prior art, the utility model provides a double-chamber syringe includes: the cylinder is internally provided with a first blocking piece, a second blocking piece and a push rod connected with the second blocking piece, wherein the first blocking piece and the near end of the cylinder form a first cavity, the first blocking piece and the second blocking piece form a second cavity, the inner wall of the first cavity is provided with a communicating structure, when the first blocking piece moves to the communicating structure, the first cavity is communicated with the second cavity, and the far end edge of the cylinder is provided with a convex angle protruding towards the direction of a central shaft; the push rod comprises a plurality of fins with overlapped long edges, included angles are formed between every two adjacent fins, at least one notch is formed in the fin along the length direction of the push rod, a baffle located on the upper edge of the notch is arranged between the fin where each notch is located and the included angle of the adjacent fin, and the baffle blocks the push rod to move towards the near end of the cylinder when interfering with the convex angle.

Optionally, in some embodiments, the at least one notch includes a first notch located on the first wing and a second notch located on the second wing, the second notch is located closer to the end of the push rod than the first notch, a first stop located at the upper edge of the first notch is located between the included angle of the first wing and the adjacent wing, and a second stop located at the upper edge of the second notch is located between the included angle of the second wing and the adjacent wing.

Optionally, in some embodiments, the at least one notch includes a first notch and a second notch located on the first wing, the second notch is located closer to the end of the push rod than the first notch, a first stop located at the upper edge of the first notch is located between an included angle between the first wing and the adjacent wing, and a second stop located at the upper edge of the second notch is located between an included angle between the first wing and the adjacent wing.

Optionally, in some embodiments, the barrel of the dual chamber syringe comprises a cartridge and a booster mounted at the distal end of the cartridge, the booster snapping over a flange at the distal end of the cartridge to extend the flange, a central opening edge of the booster projecting in a direction of the central axis to form the lobe.

Further, the proximal end of the cartridge is sealed with a plug and aluminum cap.

Further, this aluminum cap cup joints in the outside of this plug, and this plug includes an upper cover and a cylinder section of thick bamboo, and this upper cover blocks up the near-end opening of this cassette bottle, and this cylinder section of thick bamboo inserts this near-end opening in order to seal, includes at least one on the section of thick bamboo wall of this cylinder section of thick bamboo and cracks.

Optionally, in some embodiments, the first stopper and the second stopper of the dual chamber syringe are made of an elastomeric material to seal the first chamber and the second chamber.

Optionally, in some embodiments, the communicating structure of the dual chamber syringe comprises at least one communicating groove distributed along the circumference of the inner wall of the barrel.

Furthermore, the extending direction of each communicating groove is consistent with the axial direction of the cylinder or forms a certain included angle with the axial direction of the cylinder.

Optionally, in some embodiments, the communicating structure of the dual chamber syringe comprises at least one rib circumferentially distributed along the inner wall of the barrel.

Furthermore, the extending direction of each convex strip is consistent with the axial direction of the cylinder body or forms a certain included angle with the axial direction of the cylinder body.

Optionally, in some embodiments, the dual chamber syringe further comprises: the needle head connecting piece comprises a sleeving body and a double-head needle tube penetrating through the sleeving body, wherein the sleeving body is provided with an internal thread to be connected with the external thread on the outer wall of the near end of the tube body in a matching mode, so that the sleeving body is sleeved on the near end of the tube body, a first needle head of the double-head needle tube is located in the sleeving body and stretches into the first cavity of the tube body, and a second needle head of the double-head needle tube is located outside the sleeving body.

The utility model provides a modified two-chamber syringe can avoid the risk that starts the medicine mixing process because of the maloperation that the embedment syringe exists in advance.

Drawings

The above features and advantages of the present invention will be better understood after reading the detailed description of embodiments of the present disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar associated characteristics or features may have the same or similar reference numerals.

Fig. 1A illustrates a schematic structural view of a dual chamber syringe provided in accordance with an aspect of the present invention;

FIG. 1B showsbase:Sub>A cross-sectional view of section A-A of the dual chamber syringe of FIG. 1A;

fig. 2 illustrates a cross-sectional view of a cartridge provided with a communicating structure, provided in accordance with some embodiments of the present invention;

fig. 3A illustrates a bottom view of a barrel of a dual chamber syringe provided in accordance with some embodiments of the present invention;

fig. 3B illustrates a right side view of a barrel of a dual chamber syringe provided in accordance with some embodiments of the present invention;

fig. 3C illustrates a front view of a barrel of a dual chamber syringe provided in accordance with some embodiments of the present invention;

figure 3D illustrates a left side view of a barrel of a dual chamber syringe provided in accordance with some embodiments of the present invention;

figure 3E illustrates a side view of a barrel of a dual chamber syringe provided in accordance with some embodiments of the present invention;

fig. 3F illustrates a top view of a barrel of a dual chamber syringe provided in accordance with some embodiments of the present invention;

fig. 4A illustrates a schematic structural view of a barrel of a dual chamber syringe including a needle attachment, provided in accordance with some embodiments of the present invention;

FIG. 4B shows a cross-sectional view of section B-B of the barrel of the dual chamber syringe of FIG. 4A including a needle attachment;

fig. 5A illustrates a front view of a booster for a dual chamber syringe according to some embodiments of the present invention;

fig. 5B illustrates a side view of a booster for a dual chamber syringe according to some embodiments of the present invention;

fig. 5C illustrates a bottom view of a booster of a dual chamber syringe provided in accordance with some embodiments of the present invention;

fig. 5D illustrates a rear view of a booster for a dual chamber syringe according to some embodiments of the present invention;

fig. 5E illustrates a left side view of a booster for a dual chamber syringe provided in accordance with some embodiments of the present invention;

fig. 5F illustrates a right side view of a booster for a dual chamber syringe according to some embodiments of the present invention;

fig. 5G illustrates a top view of a booster for a dual chamber syringe according to some embodiments of the present invention;

FIG. 6A illustrates a top view of a pushrod of a dual chamber syringe according to some embodiments of the present invention;

FIG. 6B shows a bottom view of the pushrod of the dual chamber syringe of FIG. 6A;

fig. 7A is a top view of a pushrod of a dual chamber syringe according to another embodiment of the present invention;

FIG. 7B shows a bottom view of the pushrod of the dual chamber syringe of FIG. 7A;

FIG. 8A illustrates a front view of a pushrod of a dual chamber syringe according to further embodiments of the present invention;

fig. 8B illustrates a right side view of a pushrod of a dual chamber syringe provided in accordance with still further embodiments of the present invention;

figure 8C illustrates a left side view of the push rod of a dual chamber syringe provided in accordance with still further embodiments of the present invention;

FIG. 8D showsbase:Sub>A cross-sectional view taken along section A-A of the pushrod of the dual chamber syringe of FIG. 8C;

fig. 9 is a schematic diagram illustrating a dual chamber syringe configuration with the lobe of a booster interfering with the baffle according to some embodiments of the present invention; and

fig. 10 illustrates a schematic diagram of a dual chamber syringe configuration in which the lobes of a booster are not within the projected range of the baffle according to some embodiments of the present invention.

Reference numerals:

100. a dual chamber syringe;

110. a barrel;

120. a needle head connector;

130. a push rod;

a, the near end of a cylinder body;

b, the far end of the cylinder body;

111. a first stopper;

112. a second stopper;

113. a rubber plug;

1131. an upper sealing cover;

1132. a cylindrical barrel;

1133. slotting;

114. an aluminum cap;

115. a communicating structure;

1110. a first chamber;

1120. a second chamber;

116. a lobe;

117. a booster;

131. a first fin;

1310. a first notch;

1311. a first baffle plate;

132. a second fin;

1320. a second notch;

1321. a second baffle;

133. a third fin;

1330. a third notch;

1331. a third baffle plate;

134. a fourth fin;

121. sleeving a body;

1211. an internal thread;

1212. anti-skid lines;

122. a double-ended needle cannula;

1221. a first needle;

1222. a second needle; and

118. and (4) external threads.

Detailed Description

The following description is given for illustrative embodiments of the invention, and other advantages and effects of the invention will be apparent to those skilled in the art from the disclosure of the present invention. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to only those embodiments. On the contrary, the intention of implementing the novel features described in connection with the embodiments is to cover alternatives or modifications as may be included in the appended claims. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Furthermore, some of the specific details are omitted from the description so as not to obscure or obscure the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Additionally, the terms "upper," "lower," "left," "right," "top," "bottom," "horizontal," "vertical" and the like as used in the following description are to be understood as referring to the segment and the associated drawings in the illustrated orientation. The relative terms are used for convenience of description only and do not imply that the described apparatus should be constructed or operated in a particular orientation, and therefore should not be construed as limiting the invention.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, regions, layers and/or sections, these elements, regions, layers and/or sections should not be limited by these terms, but rather are used to distinguish one element, region, layer and/or section from another element, region, layer and/or section. Thus, a first component, region, layer and/or section discussed below could be termed a second component, region, layer and/or section without departing from some embodiments of the present invention.

As described above, in the existing pre-filled and sealed syringe having two chambers, during the actual use process, there is a risk of misoperation of the push rod, that is, during the transportation and storage of the syringe, the push rod touches an external object, which easily causes the first stopper to move, and if the push rod moves to the communicating groove, the preparation process of the mixed preparation is started, resulting in the waste of the medicine and the medical supplies.

In order to solve the above-mentioned problem that exists among the prior art, the utility model provides a modified two-chamber syringe can avoid the risk that starts the medicine mixing process because of the maloperation that the embedment syringe exists in advance.

Referring to fig. 1A, fig. 1A is a schematic structural diagram of a dual-chamber syringe according to an aspect of the present invention.

As shown in FIG. 1A, in some embodiments of the present invention, an improved dual chamber syringe 100 may include a barrel 110, a needle attachment element 120 disposed at a proximal end A of the barrel 110, and a pushrod 130 disposed at an opening at a distal end B of the barrel 110.

Referring specifically to fig. 1B, fig. 1B showsbase:Sub>A cross-sectional view of sectionbase:Sub>A-base:Sub>A of dual chamber syringe 100 shown in fig. 1A. Included within barrel 110 of dual-chamber syringe 100 are first stop 111, second stop 112, and pushrod 130. The proximal end A of the barrel 110 is adapted to be connected to the needle hub 120, the distal end B of the barrel 110 is opened to allow the first stopper 111 and the second stopper 112 to be sequentially inserted into the barrel 110, and the push rod 130 is connected to the second stopper 112.

A first chamber 1110 for storing a powdered drug (solute), such as lyophilized powder, is formed between the first stopper 111 and the proximal end a of the barrel 110. One end of the first chamber 1110 is sealed by the first stopper 111. A second chamber 1120 for storing a shot (solvent) is formed between the second stopper 112 and the first stopper 111. The second chamber 1120 is sealed at both ends by the first stopper 111 and the second stopper 112, respectively. The first stopper 111 and the second stopper 112 may be made of an elastic material, such as rubber, to achieve a sealing function.

The inner wall of the first chamber 1110 is provided with a communicating structure. With specific reference to fig. 2, fig. 2 shows a cross-sectional view of a barrel provided with a communicating structure according to some embodiments of the present invention.

As shown in fig. 2, a communication structure 115 is provided on an inner sidewall of the cylinder 110. Referring to fig. 1B, the communicating structure 115 may be further disposed on the inner sidewall of the first chamber 1110.

Referring to fig. 1B and 2, when the two medicines in the dual-chamber syringe 100 are stored in the separate chambers, the first stopper 111 is located at the side of the communicating structure 115 close to the distal end B of the barrel 110, i.e. the communicating structure 115 is located in the first chamber 1110. In use of the dual-chamber syringe 100, the push rod 130 acts on the second stopper 112 and forces the first stopper 111 via the solvent in the second chamber 1120. In the process, the first stopper 111 and the second stopper 112 move in the length direction towards the proximal end a of the barrel 110, when the first stopper 111 moves to the position of the communicating structure 115, the second chamber 1120 communicates with the first chamber 1110, and the solvent in the second chamber 1120 enters the first chamber 1110 through the communicating structure 115 to mix with the powdered solute in the first chamber 1110 for formulation configuration. The push rod 130 may be pushed further after the configuration is completed to perform an injection operation of the mixed preparation.

When the first stopper 111 moves to the position of the communicating structure 115, the two chambers that are originally sealed independently, the first chamber 1110 and the second chamber 1120 are communicated with each other, and the air pressure in the two chambers is the same. The push rod 130 is continuously pushed to act on the second stopper 112, the first stopper 111 remains stationary, and the solvent in the second chamber 1120 enters the first chamber 1110 through the communicating structure 115 with the extrusion of the second stopper 112. Preferably, the second stopper 112 may be continuously pushed such that the second stopper 112 is pushed into contact with the first stopper 111, ensuring that all the solvent in the second chamber 1120 enters the first chamber 1110.

Further, when the solvent in the second chamber 1120 flows into the first chamber 1110, the gas in the first chamber 1110 also flows into the second chamber 1120. During the process of continuously pushing the push rod 130 to make the second stopper 112 close to the first stopper 111, the second stopper 112 rebounds to a small extent due to the air flow entering the first chamber 1110, so that the medicine can be mixed more uniformly by pushing the push rod 130 multiple times.

Alternatively, in an embodiment, the communication structure 115 may be a communication groove structure. Specifically, at least one communication groove 115 may be provided in the inner sidewall of the cylinder 110. Preferably, the plurality of communication grooves 115 may be uniformly distributed along the circumferential direction of the inner sidewall of the cylinder 110. The extending direction of the communication groove 115 may be selected to coincide with the axial direction of the cylinder 110. The extending direction of the communicating groove 115 may also be selected to form a certain angle with the axial direction of the cylinder 110, wherein when the communicating groove 115 is a chute structure, the extending direction of which forms a certain angle with the axial direction of the cylinder 110, the solvent in the second chamber 1120 can form a spiral liquid flow when entering the first chamber 1110, so that the injection (solvent) and the powder (solute) flowing from the second chamber 1120 to the first chamber 1110 can be fully mixed.

Alternatively, in another embodiment, the communication structure 115 may be a ribbed structure. Specifically, at least one rib 115 may be provided on the inner wall of the cylinder 110. Preferably, a plurality of ribs 115 may be uniformly distributed along the circumferential direction of the inner sidewall of the cylinder 110. The extending direction of the rib 115 may be selected to coincide with the axial direction of the cylinder 110. When the first stopper 111 is pushed forward to the position of the protrusion 115, the sidewall of the first stopper 111 made of an elastic material is deformed by the protrusion 115, and forms a medicament channel for the solvent in the second chamber 1120 to pass through with the side of the protrusion 115.

The extending direction of the protruding strip 115 may also be selected to form a certain included angle with the axial direction of the cylinder 110, wherein when the protruding strip 115 is of an oblique strip structure with a certain included angle with the axial direction of the cylinder 110, the medicament channel is also arranged obliquely, so that the solvent in the second chamber 1120 forms a spiral liquid flow when entering the first chamber 1110, and the injection (solvent) and the powder (solute) flowing into the first chamber 1110 from the second chamber 1120 can be mixed uniformly. The height of the rib 115 in the radial direction of the cylinder 110 may be 0.01 to 0.5mm.

In the embodiment where the communicating structure 115 is a convex strip, when the second stopper 112 is pushed forward to be in close contact with the first stopper 111, the second stopper 112 and the first stopper 111 are elastically deformed at the convex strip position to ensure that both can pass through the communicating structure 115.

Referring to fig. 3A-3F, fig. 3A-3F illustrate right, front, left, side, bottom, and top views of a barrel of a dual chamber syringe according to some embodiments of the present invention.

Preferably, the cartridge 110 may be a cartridge. The cassette bottle adopts double-cavity and multi-cavity engineering technology, comprises a high-capacity cassette bottle, a double-cavity cassette bottle and the like, can cover the combination range of 1 ml-20 ml specification, and is suitable for liquid and powder preparations. Fig. 3B-3F show the exterior of the cartridge barrel 110, the exterior of the proximal end a of the cartridge barrel 110 being sealed by an aluminum cap 114.

Referring to fig. 2, the interior of the proximal end a of the cartridge barrel 110 is sealed by a plug 113. As shown in fig. 2, the structure of the rubber plug 113 includes a circular upper cover 1131 and an integrally formed cylindrical tube 1132 connected to the lower surface of the upper cover 1131. At least one slot 1133 is formed on the wall of the cylindrical barrel 1132. In the embodiment shown in FIG. 2, the cylindrical barrel 1132 includes a slit 1133 on each of the left and right sides of the barrel wall.

In the preparation process of the powdered medicament, for example, in the preparation process of the freeze-dried powder, the sterilizing liquid medicament is filled into the barrel 110 at first, and the rubber plug 113 is partially pressed into the opening of the proximal end a of the barrel 110. The slits 1133 on the rubber plug 113 are used to maintain the inside and outside of the cylinder 110 in communication. The liquid medicine in the cylinder 110 is freeze-dried, and gas generated during the freeze-drying process may be discharged out of the cylinder 110 through the slits 1133. After the liquid medicine in the cylinder 110 is freeze-dried and forms a powdery solid, the rubber plug 113 is pressed downwards to make the slit 1133 completely blocked by the side wall of the proximal end a of the cylinder 110, and finally, the aluminum cover 114 is sleeved outside the rubber plug 113 for further sealing.

For the dual-cavity injection 100, if the freeze-dried powder is stored in the first cavity 1110, the preparation process of the freeze-dried powder has certain particularity, so that the problem of inconvenient operations such as timely exhausting and the like in the processes of filling and preparing the freeze-dried powder for liquid medicines is solved, and the inconvenience in the operations in the filling preparation process of the liquid medicines can be solved by using the rubber plug 113 with the slit 1133.

Further, referring to fig. 4A and 4B, fig. 4A is a schematic structural view of a barrel of a dual chamber syringe including a needle attachment member according to some embodiments of the present invention, and fig. 4B is a cross-sectional view of the B-B section of the barrel of the dual chamber syringe including a needle attachment member shown in fig. 4A.

In the embodiment shown in fig. 4A, 4B, dual chamber syringe 100 may further include needle attachment 120. The needle connector 120 includes a set body 121 and a double-ended needle cannula 122 passing through the set body 121. The inside wall of the body 121 has internal threads 1211 for engaging with the external threads 118 on the outer wall of the proximal end of the barrel 110, so that the needle connector 120 is fixedly secured to the outside of the proximal end A of the barrel 110.

The first needle 1221 of the double-ended needle cannula 122 is located inside the encasement body 121. When the needle attachment 120 is installed, the cap on the proximal end a of the cartridge body 110 is removed to expose the central opening of the aluminum cap 114, and the first needle 1221 pierces the plug 113 corresponding to the central opening to extend into the first chamber 1110 of the cartridge body 110. The second needle 1222 of the double-ended needle cannula 122 is located outside the package body 121 and is adapted for injection.

Optionally, an external anti-slip pattern 1212 may be further provided on the outer sidewall of the sheathing body 121 of the needle connector 120 to facilitate the screw assembly and screw disassembly between the needle connector 120 and the barrel 110.

Continuing to refer back to fig. 3A, from a top view of barrel 110 of dual chamber syringe 100 in one embodiment, it can be seen that a lobe 116 is provided at the edge of distal end B of barrel 110 that projects toward the central axis.

Preferably, in order to facilitate handling of the double-chamber syringe 100, a booster 117 may be fitted to the distal end B opening of the cylinder 110, and the convex corner 116 may be provided at a position where the edge of the central opening of the booster 117 is projected in the central axis direction.

Referring specifically to fig. 5A-5G, fig. 5A-5G illustrate a front view, a side view, a bottom view, a rear view, a left side view, a right side view, and a top view of a booster of a dual chamber syringe according to some embodiments of the present invention.

A booster 117 is fitted at the opening at the distal end B of the cartridge barrel 110. Because the pressing hem at the opening of the far end B of the cylinder body 110 of the cassette bottle is narrow, when medical staff clamps and presses the hem by fingers, the hand force is not convenient to apply, so that the push-aid 117 is assembled and clamped with the pressing hem at the far end B of the cylinder body 110 of the cassette bottle, the pressing hem can be transversely extended, and the hand force is more convenient for the medical staff to apply when operating the double-cavity syringe 100. As shown in fig. 5A, 5B, and 5D, a convex corner 116 is provided at a position where the center opening edge of the booster 117 protrudes in the center axis direction.

Before describing the function of the lobe 116 throughout dual chamber syringe 100, reference is made to the structure of pushrod 130 in fig. 6A, 6B, 7A, 7B, and 8A-8D.

Figures 6A and 6B illustrate top and bottom views of a pushrod of a dual chamber syringe according to some embodiments of the present invention.

The utility model discloses in, push rod 130 includes the fin of a plurality of long limit coincidences, forms contained angle alpha 1 between the adjacent fin, and push rod 130 is equipped with at least one breach along length direction on the fin, is equipped with the baffle that is located the border on the breach between the fin at every breach place and the contained angle of adjacent fin.

As shown in fig. 6A and 6B, the front end of the push rod 130 is fixedly connected to the second stopper 112. The push rod 130 is composed of a plurality of fins with the same length and overlapped long sides, such as a first fin 131 and its adjacent fins. The first wing 131 and its adjacent wing form an angle α 1 therebetween. For example, the push rod 130 may include 3 fins with an included angle α 1 of 120 ° between adjacent fins, and optionally the push rod 130 may also include 4 fins with an included angle α 1 of 90 ° between adjacent fins.

There is a first notch 1310 on the first wing 131 of the push rod 130, and a first baffle 1311 is disposed between the first wing 131 and the adjacent wing, and the first baffle 1311 is disposed on the upper edge of the first notch 1310 near the end of the push rod 130.

Further, the tab of the push rod 130 may include two notches thereon. Referring to fig. 7A and 7B, fig. 7A illustrates a top view of a pushrod of a dual chamber syringe according to further embodiments of the present invention, and fig. 7B illustrates a bottom view of the pushrod of the dual chamber syringe of fig. 7A.

With reference to fig. 6A, 6B, 7A, 7B, in some embodiments, the two notches on the push rod 130 can include a first notch 1310 located on the first wing 131 and a second notch 1320 located on the second wing 132. In fig. 6A and 6B, a first baffle 1311 is disposed at the upper edge of the first notch 1310 between the included angle α 1 between the first wing 131 and the adjacent wing. In fig. 7A and 7B, a second baffle 1321 is disposed at an upper edge of the second notch 1320 between the angle α 2 between the second wing 132 and the adjacent wing, wherein the second notch 1320 is located closer to the end of the push rod 130 than the first notch 1310.

Further, the tab of the push rod 130 may further include a plurality of notches, for example, three notches. Referring to fig. 8A-8D, fig. 8A-8C illustrate front, right and left views ofbase:Sub>A pushrod ofbase:Sub>A dual chamber syringe according to further embodiments of the present invention, and fig. 8D illustratesbase:Sub>A cross-sectional view of the pushrod of the dual chamber syringe of fig. 8C in sectionbase:Sub>A-base:Sub>A.

As shown in fig. 8A-8C, the at least one notch on the push rod 130 can include a first notch 1310 located on the first wing 131, a second notch 1320 located on the second wing 132, and a third notch 1330 located on the third wing 133. In the front view shown in fig. 8A, a first baffle 1311 is disposed between the first wing 131 and the adjacent fourth wing 134 at the upper edge of the first notch 1310. In the right view shown in fig. 8B, a second baffle 1321 is disposed at an upper edge of the second notch 1320 between the second wing 132 and the first wing 131, wherein the second notch 1320 is located closer to the end of the push rod 130 than the first notch 1310. In the left side view shown in fig. 8C, a third baffle 1331 is disposed between the third wing 133 and the second wing 132 and located at the upper edge of the third gap 1330, wherein the third gap 1330 is located closer to the end of the push rod 130 than the second gap 1320.

Referring to fig. 8A to 8C, the three first gaps 1310, the second gaps 1320, and the third gaps 1330 of the push rod 130 are separated by a certain distance, but the distance between the two gaps is not fixed, and those skilled in the art can set the distance according to the requirement, so that the requirement that the next gap is located closer to the end of the push rod 130 than the previous gap is met.

Alternatively, in other embodiments, multiple indentations on the push rod 130 may be located on the same tab. For example, the first wing 131 of the push rod 130 may include a first notch 1310 and a second notch 1320 thereon. A first baffle 1311 located at the upper edge of the first notch 1310 is disposed between the included angle α 1 between the first wing 131 and the adjacent wing on one side thereof. A second baffle 1321 is disposed between the angle α 2 between the first wing 131 and the adjacent wing on the other side thereof, and is located at the upper edge of the second notch 1320, wherein the second notch 1320 is located closer to the end of the push rod 130 than the first notch 1310 is located on the first wing 131.

The working principle of dual chamber syringe 100 will be described in detail below with reference to fig. 9 and 10. Fig. 9 shows a schematic structural view of a dual-chamber syringe in a state where a convex angle of a booster provided according to some embodiments of the present invention interferes with a baffle, and fig. 10 shows a schematic structural view of a dual-chamber syringe in which a convex angle of a booster provided according to some embodiments of the present invention is not within a projection range of the baffle.

First, the double chamber syringe 100 is assembled as shown in fig. 9 and 10, the needle attachment 120 is fixedly attached to the proximal port a of the barrel 110, and the first needle 1221 of the double-ended needle cannula 122 pierces the plug 113.

As shown in fig. 9, in the enlarged partial region i, when the convex angle 116 at the edge of the opening at the distal end B of the barrel 110 interferes with the first baffle 1311 on the push rod 130, the convex angle 116 is blocked in front of the first baffle 1311, so that the push rod 130 cannot be pushed forward toward the proximal end a of the barrel 110, thereby preventing the push rod 130 from pushing the second baffle 112 forward due to misoperation or collision force application, and causing the solvent in the second chamber 1120 to enter the first chamber 1110, so that the injection and powder medicine mixing process is started by mistake in advance.

Rotating the push rod 130 in fig. 9 counterclockwise to the position shown in fig. 10, which is a partial enlarged region ii shown in fig. 10, makes the convex corner 116 of the barrel 110 pass through the first notch 1310 located at the lower edge of the first baffle 1311 to the other included angle space formed by two fins of the push rod 130, in which there is no projection of the first baffle 1311 along the length direction of the barrel 110. At this time, the push rod 130 can continue to push forward toward the proximal end a of the barrel 110, and the second stopper 112 is close to and attached to the first stopper 111, so that the solvent in the second chamber 1120 enters the first chamber 1110, and the drug mixing procedure is started.

Preferably, in fig. 9 and 10, a second notch 1320 may be further included at a position where the push rod 130 is closer to the end of the push rod 130 than the first notch 1310. A second notch 1320 is disposed on the second wing 132, and a second baffle 1321 is disposed between the second wing 132 and the adjacent first wing 131 and located at an upper edge of the second notch 1320. When the push rod 130 is rotated, the convex angle 116 passes through the first gap 1310 and falls into the angle space formed by the first wing 131 and the second wing 132.

During continued advancement of the push rod 130 into the barrel 110, the lobe 116 again interferes with the second stop 1321 and the push rod 130 cannot continue to move toward the proximal end A of the barrel 110. At this time, the first stopper 111 in the cylinder 110 moves to the communicating structure 115, the second chamber 1120 and the first chamber 1110 are communicated through the communicating structure 115, and the solvent in the second chamber 1120 enters the first chamber 1110 to perform a mixing operation with the solute in the first chamber 1110. The second baffle 1321 is provided to prevent the medicine from being injected out and causing waste of the medicine in the case where the medicine and the solvent are not completely mixed due to a wrong operation in the medicine mixing process. That is, the second stopper 1321 functions to prevent an operation of an early erroneous injection.

After the two chambers are fully mixed, the push rod 130 continues to rotate, so that the convex angle 116 passes through the second notch 1320 at the lower edge of the second baffle 1321 to another included angle space formed by two fins of the push rod 130, where a projection of the second baffle 1321 along the length direction of the barrel 110 is not present in the included angle space. At this point, the push rod 130 may continue to push forward toward the proximal end A of the barrel 110 to initiate the injection procedure. The first notch 1310 is closer to the proximal end of the push rod 130 than the second notch 1320. The rotation angle of the push rod 130 may be in the range of 30 to 270 ° each time.

Further, a third gap 1330 may be further disposed on the push rod 130. After the interference between the second stop 1321 on the pushrod 130 and the lobe 116 of the barrel 110 is released, the pushrod 130 is pushed further toward the proximal end A of the barrel 110 to the position of the third gap 1330, during which the injected dose is the first dose. Further, after the interference between the third stop 1331 and the convex corner 116 is released, the push rod 130 is pushed to the proximal end a of the barrel 110 to the position of the fourth notch, in the process, the injection dose is the second dose, and the split-dose injection operation of the injector is realized.

It will be appreciated by those skilled in the art that the above-described solution of the dual chamber syringe including one or more of the first baffle 1311, the second baffle 1321, the third baffle 1331 and even the fourth baffle is only one non-limiting embodiment provided by the present invention, which is intended to clearly demonstrate the main concepts of the present invention and provide a specific solution for the convenience of the public, not to limit the scope of the present invention.

To sum up, the utility model provides a modified two-chamber syringe can avoid the risk that starts the medicine mixing process because of the maloperation that the embedment syringe exists in advance to the filling preparation in-process that can solve liquid medicine is inconvenient, can also realize the gradation dosing injection operation of syringe simultaneously.

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

Claims (12)

1. A dual chamber syringe, comprising:

the cylinder is internally provided with a first blocking piece, a second blocking piece and a push rod connected with the second blocking piece, wherein the first blocking piece and the push rod are placed from a far-end opening;

the push rod comprises a plurality of fins with overlapped long edges, included angles are formed between every two adjacent fins, at least one notch is formed in the fin along the length direction of the push rod, a baffle located on the upper edge of the notch is arranged between the fin where each notch is located and the included angle of the adjacent fin, and the baffle blocks the push rod to move towards the near end of the barrel when the convex angle interferes.

2. The dual chamber syringe of claim 1 wherein said at least one notch comprises a first notch located on a first wing and a second notch located on a second wing, said second notch located closer to the terminus of the pushrod than said first notch,

a first baffle plate positioned at the upper edge of the first notch is arranged between the included angle of the first wing plate and the adjacent wing plate, and

and a second baffle positioned at the upper edge of the second notch is arranged between the included angle of the second wing and the adjacent wing.

3. The dual chamber syringe of claim 1 wherein said at least one notch includes a first notch and a second notch located on the first tab, said second notch being located closer to the terminus of the pushrod than said first notch,

a first baffle plate positioned at the upper edge of the first notch is arranged between the included angle of the first wing plate and the adjacent wing plate, and

and a second baffle positioned at the upper edge of the second notch is arranged between the included angle of the first wing and the adjacent wing.

4. The dual chamber syringe of claim 1 wherein said barrel includes a cartridge bottle and a booster mounted at a distal end of said cartridge bottle, said booster snap-engaging a flange at said distal end of said cartridge bottle to extend said flange, a central open edge of said booster projecting in a central axial direction to form said lobe.

5. The dual chamber syringe of claim 4 wherein the cartridge proximal end is sealed with a rubber plug and aluminum cap.

6. The dual-chamber syringe of claim 5, wherein the aluminum cap is sleeved on the outside of the rubber plug, the rubber plug comprises an upper sealing cover and a cylindrical barrel, the upper sealing cover blocks the proximal opening of the cartridge bottle, the cylindrical barrel is inserted into the proximal opening for sealing, and the wall of the cylindrical barrel comprises at least one slit.

7. The dual chamber syringe of claim 1 wherein said first stopper and said second stopper are made of an elastomeric material to seal said first chamber and said second chamber.

8. The dual chamber syringe of claim 1 wherein said communicating structure comprises at least one communicating channel circumferentially disposed along the inner wall of the barrel.

9. The dual chamber syringe of claim 8 wherein each of said channels extends in a direction that is coincident with or at an angle to the axial direction of said barrel.

10. The dual chamber syringe of claim 1 wherein said communicating structure comprises at least one rib circumferentially disposed about the inner wall of the barrel.

11. The dual chamber syringe of claim 10 wherein each of said ribs extends in a direction that is coincident with or at an angle to the axial direction of said barrel.

12. The dual chamber syringe of claim 1 further comprising:

the needle head connecting piece comprises a sleeving body and a double-end needle tube penetrating through the sleeving body, wherein the sleeving body is provided with an internal thread to be connected with the external thread on the outer wall of the near end of the tube body in a matching manner, so that the sleeving body is sleeved at the near end of the tube body, a first needle head of the double-end needle tube is positioned in the sleeving body to stretch into the tube body, a first cavity is formed in the sleeving body, and a second needle head of the double-end needle tube is positioned outside the sleeving body.

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