CN213491187U - Dual chamber syringe assembly - Google Patents

Abstract

The present application relates to a dual chamber syringe assembly comprising: a first syringe and a second syringe, the first syringe comprising a first barrel, a first plunger adapted to slide within the first barrel, a first seal attached to a distal end of the first plunger, and a first adapter at a distal end of the first barrel, wherein the first adapter is configured to engage with a first needle or a first end cap; the second syringe comprises a second barrel, a second plunger adapted to slide within the second barrel, a second seal attached to a distal end of the second plunger, and a second adapter at a distal end of the second barrel, wherein the second adapter is configured to engage with a second needle or a second end cap; wherein the first plunger has a chamber sized and shaped to receive and slide the second syringe inside the first plunger.

Description

Dual chamber syringe assembly

Technical Field

The present application relates to syringe assemblies and, more particularly, to dual chamber syringe assemblies.

Background

Syringes are commonly used as a medical supply for either injecting medication directly into a patient or replenishing medication into a medical fluid container.

The traditional single injector can only inject a single medicament in one operation, and when a plurality of medicaments are required to be injected to a patient, the patient needs to be punctured for many times, so that more pain is caused to the patient.

Furthermore, in some scenarios, it is desirable to inject a patient with a mixture of different medicaments. However, different medicaments are stored and stored under different conditions, and are generally kept separately from each other for mixing with each other as an injection only at the time of injection. In order to mix, a method of using a single syringe to draw a certain amount of medicine from different medicine containers respectively and then mixing the medicines in the same syringe is complicated and may contaminate at least one of the medicines.

In view of the above-mentioned problems with the prior art, there is a need to provide an improved syringe assembly that reduces the number of injection operations to inject multiple medicaments; and mixing of multiple agents in vitro can be accomplished within the syringe assembly.

SUMMERY OF THE UTILITY MODEL

According to one aspect of the present application, there is provided a dual chamber syringe assembly comprising: a first injector comprising a first syringe, a first plunger adapted to slide within the first syringe, a first seal attached to a distal end of the first plunger, and a first adapter at a distal end of the first syringe, wherein the first adapter is configured to engage with a first needle or a first end cap; a second syringe comprising a second barrel, a second plunger adapted to slide within the second barrel, a second seal attached to a distal end of the second plunger, and a second adapter at a distal end of the second barrel, wherein the second adapter is configured to engage with a second needle or a second end cap; wherein the first plunger has a chamber sized and shaped to receive and slide the second syringe inside the first plunger.

According to some embodiments of the present application, a distal end of the first plunger is configured with an annular groove for receiving at least a portion of the first seal.

According to some embodiments of the present application, a distal sidewall of the annular groove of the first plunger has a chamfer.

According to some embodiments of the present application, the first seal has a tapered portion and a hollow cylindrical portion, wherein an inner surface of the cylindrical portion has an annular protrusion for fitting into an annular groove of the first plunger.

According to some embodiments of the application, the first plunger has a flange at a proximal end and an outer surface of the first plunger has a tapered portion extending from 15mm to 25mm from the flange towards a distal end of the first plunger.

According to some embodiments of the application, the first seal is made of an elastic material.

According to some embodiments of the present application, prior to use, the second syringe is prefilled with a drug and the second adapter is sealed by a second end cap coupled thereto.

On one hand, the double-chamber injector component provided by the application can inject various medicaments under the condition of only puncturing once, so that the workload of medical staff is reduced, and the pain of a patient is relieved; on the other hand, pre-mixing of multiple medicaments outside the body can be accomplished within the dual-chamber syringe assembly, reducing the risk of contamination of the medicaments.

The foregoing is a summary of the application that may be simplified, generalized, and details omitted, and thus it should be understood by those skilled in the art that this section is merely exemplary and is not intended to limit the scope of the application in any way.

Drawings

The above-described and other features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. It is appreciated that these drawings depict only several embodiments of the disclosure and are therefore not to be considered limiting of its scope. The present disclosure will be described more clearly and in detail by using the accompanying drawings.

FIG. 1 shows a longitudinal cross-sectional view of a dual chamber syringe assembly having an embodiment in accordance with the present application.

FIG. 2A shows a longitudinal cross-sectional view of a first syringe of a dual chamber syringe assembly according to an embodiment of the present application.

FIG. 2B illustrates a longitudinal cross-sectional view of a first syringe of a dual chamber syringe assembly having a first needle attached to a first adapter of the first syringe according to an embodiment of the present application.

FIG. 2C illustrates an enlarged partial view of the first syringe of the dual chamber syringe assembly further depicting the first seal of the first syringe according to embodiments of the present application.

FIG. 3 illustrates a longitudinal cross-sectional view of a second syringe of a dual chamber syringe assembly having a second needle attached to a second adapter of the second syringe according to an embodiment of the present application.

Fig. 4A illustrates a longitudinal cross-sectional view of a first plunger of a first syringe according to an embodiment of the present application.

Fig. 4B shows an enlarged partial view of the distal end of the first plunger of the first syringe according to an embodiment of the present application.

FIG. 5 illustrates a schematic flow diagram of a dual chamber injector assembly in a premixing operation in accordance with an embodiment of the present application.

FIG. 6 illustrates a flow diagram of a dual-chamber syringe assembly during a pre-filled supplemental injection operation according to an embodiment of the present application.

List of reference numerals in the description:

reference numerals	Name of component
		10	Dual chamber syringe assembly
100	First syringe
		110	First syringe
120	First plunger
		130	First seal member
140	First adapter
		150	First needle
200	Second syringe
		210	Second syringe
220	Second plunger
		230	Second seal
240	Second adapter
		250	Second needle
121	Chamber
		122	Flange
123	Annular recess
		124	Chamfering
125	Tapered portion
		131	Tapered section
132	Cylindrical part
		133	Annular protrusion

Detailed Description

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like reference numerals generally refer to like parts throughout the various views unless the context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not intended to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter of the present application. It will be understood that aspects of the present disclosure, as generally described in the present application and illustrated in the figures herein, may be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which should not be construed as limiting the scope.

FIG. 1 shows a longitudinal cross-sectional view of a dual chamber syringe assembly having an embodiment in accordance with the present application. As shown in fig. 1, dual-chamber syringe assembly 10 includes a first syringe 100 and a second syringe 200, second syringe 200 being capable of being received by and sliding within first syringe 100.

FIG. 2A shows a longitudinal cross-sectional view of a first syringe of a dual chamber syringe assembly according to an embodiment of the present application. FIG. 2B illustrates a longitudinal cross-sectional view of a first syringe of a dual chamber syringe assembly having a first needle attached to a first adapter of the first syringe according to an embodiment of the present application. FIG. 2C illustrates an enlarged partial view of the first syringe of the dual chamber syringe assembly further depicting the first seal of the first syringe according to embodiments of the present application. Referring to fig. 2A, 2B and 2C, the first injector 100 includes a first syringe 110 and a first plunger 120, the first plunger 120 being adapted to slide within the first syringe 110. When it is desired to expel air or bolus the first plunger 120 slides distally (to the left in the figure). When it is desired to withdraw a dose, the first plunger 120 slides proximally (to the right in the figure).

The first plunger 120 has a chamber 121, the chamber 121 being sized and shaped for receiving the second syringe 200 and allowing the second syringe 200 to slide inside the first plunger 120 for pre-mixing or pre-filling of a medicament for a supplemental injection (as described in more detail below). Attached to the distal end of the first plunger 120 is a first seal 130 for sealing the interface between the first plunger 120 and the first syringe 110. The first seal 130 has a tapered portion 131 and a hollow cylindrical portion 132, the inner surface of the cylindrical portion 132 having an annular protrusion 133 for fitting into the annular groove 123 (fig. 4A and 4B) of the first plunger. In some embodiments, the first seal 130 is made of an elastic material (e.g., rubber).

First injector 100 also includes a first adapter 140 at the distal end of first syringe 110. In some embodiments, the first adapter 140 may be a luer assembly fitting. In some embodiments, the first adapter 140 is provided as a threaded fitting. As desired, in some embodiments, the first adapter 140 may be configured to engage the first needle 150 (as shown in fig. 2B) to perform a bolus or draw medication operation. In other embodiments, first adapter 140 may be configured to engage with a first cap (e.g., the first cap in fig. 5) to temporarily close the distal end of first syringe 110. In still other embodiments, the first adapter 140 may be configured to engage a medical infusion line, such as an intravenous tube, to perform a bolus operation.

Referring to fig. 4A and 4B, fig. 4A shows a longitudinal cross-sectional view of a first plunger of a first syringe according to an embodiment of the present application. Fig. 4B shows an enlarged partial view of the distal end of the first plunger of the first syringe according to an embodiment of the present application. The distal end of the first plunger 120 is configured with an annular groove 123 for receiving at least a portion of the first seal 130. Referring collectively to fig. 2C, the first seal 130 has a tapered portion 131 and a hollow cylindrical portion 132, the inner surface of the cylindrical portion 132 having an annular protrusion 133, the annular protrusion 133 being able to fit into the annular groove 123 and form an interference fit. In some embodiments, the distal sidewall of the annular groove 123 has a chamfer 124, and the chamfer 124 can function to guide the annular protrusion 133 into the annular groove 123 when the first seal 130 is assembled to the distal end of the first plunger 120, preventing the first seal 130 from cracking during installation.

In some embodiments, the first plunger 120 has a flange 122 at a proximal end, the flange 122 being capable of providing a point of application for a user when withdrawing and pushing the first plunger 120. During manufacturing of the syringe assembly, it is sometimes necessary to machine the first plunger 120 to a predetermined position in the first barrel 110, and the flange 122 can engage a clamp to perform the corresponding operation, thereby avoiding damage to the first barrel 110 that may occur, for example, by pushing or pulling the first plunger 120 in a press-and-friction fit manner. In some embodiments, to better accommodate a finger or a clip to engage the flange 122, the outer surface of the first plunger 120 has a tapered portion 125 extending from the first plunger 120 a length L from the flange 122 toward the flange 122 and tapering in diameter. In some embodiments, the tapered portion 125 extends from a location of the first plunger 120 that is about 15mm (millimeters) to 25mm from the flange 122 toward the flange 122 and gradually decreases in diameter. In some preferred embodiments, the tapered portion 125 extends from a location of the first plunger 120 that is 20mm from the flange 122 toward the flange 122 and gradually decreases in diameter.

Fig. 3 shows a longitudinal cross-sectional view of a second syringe 200 of a dual chamber syringe assembly according to an embodiment of the present application with a second needle attached to a second adapter of the second syringe. Referring to fig. 3, the second injector 200 includes a second barrel 210 and a second plunger 220, the second plunger 220 being adapted to slide within the second barrel 220. The second plunger 220 slides distally (left end in the figure) when it is desired to expel air or bolus medication and the second plunger 220 slides proximally (right end in the figure) when it is desired to withdraw medication. A second seal 230 is attached to the distal end of the second plunger 220 for sealing the interface between the second plunger 220 and the second barrel 210.

Second syringe 200 also includes a second adapter 240 at the distal end of second syringe 210. When an infusion is desired, the second adapter 240 may be configured to engage the second needle 250 (as shown in fig. 3) to perform a bolus or draw medication operation. In some embodiments, the second syringe 200 is pre-filled with a drug; prior to use, second adapter 240 is configured to engage a second endcap (not shown) prior to use, thereby keeping the distal end of second syringe 220 closed prior to use and maintaining the medicament filled in second syringe 220 free from leakage and contamination. The second syringe 200 is able to enter and slide within the chamber 121 of the first plunger 120.

The dual chamber syringe assembly 10 according to embodiments of the present application can be used in a variety of medical contexts, and the application of the dual chamber syringe assembly 10 of the present application will be described below in terms of a medicament pre-mixing operation and a pre-filled medicament supplemental injection operation. It is contemplated by those skilled in the art that dual chamber syringe assembly 10 may be used in any other suitable medical procedure scenario.

FIG. 5 illustrates a schematic flow diagram of a dual chamber injector assembly in a premixing operation in accordance with an embodiment of the present application. In this medical scenario, the two agents need to be pre-mixed and then infused into the patient. For example, the primary-acting agent is diluted by mixing with a conventional solution and then infused; alternatively, where the two medicaments are not suitable for long term mixing storage, need to be infused as soon as possible after mixing, etc., dual chamber syringe assembly 10 of the present application provides a location and protocol for accomplishing the premixing operation.

In a premix operation as shown in fig. 5, at step 501, both the first syringe 100 and the second syringe 200 have been filled with medicament. In some embodiments, the first adapter 140 of the first injector 100 first engages the first needle 150 to withdraw the first medicament (e.g., glucose solution, sodium chloride solution, etc.) from the medicament container without filling the first syringe 110, but rather leaving room for a second medicament to be later mixed in. In some embodiments, the second syringe 200 draws the second medicament from another medicament container. In other embodiments, the second syringe 200 may be pre-filled with the second medicament at the factory and the second adapter 240 closed by a second end cap engaged therewith prior to use, in which case the second end cap would be removed and the second needle 250 would be connected to the second adapter 240.

At step 502, the second syringe 200 is pushed into the chamber 121 of the first plunger 120 of the first syringe 100 and moved distally along the chamber 121 until the second needle 250 penetrates the first seal 130, thereby communicating the first syringe 110 and the second syringe 210.

At step 503, the second plunger 220 of the second injector 200 is initially pushed to inject the second medicament into the first syringe 110 to mix the second medicament with the first medicament. To avoid spilling the medicament in the first syringe 110 during mixing, the first plunger 120 may be pulled slightly proximally while pushing the second plunger 220 to provide some room for the medicament injected from the second syringe 200. In some embodiments, the first needle 150 is replaced with the first cap before this step is performed (fig. 5 is an example of the replacement at step 501, but it will be clear to those skilled in the art that this replacement operation can be performed after the first syringe is filled with medicament and before the second syringe is injected) so as to avoid the medicament overflowing through the first needle 150 when the second syringe 200 injects medicament.

At step 504, after the second medicament has been fully infused into the first syringe 110 by the second syringe 200, the second syringe 200 is removed from the first plunger 120. Because the first sealing member 130 is made of an elastic material and has self-sealing property, the first sealing member can still rebound to seal the end part of the first plunger 120 after being punctured by the second needle 250, and the medicine in the first syringe 110 can not leak through the puncturing part of the second needle 250. The mixed first and second medicaments may be infused into a patient or infusion container by advancing the first plunger 120.

At step 505, the mixed medication is infused and the first syringe 100 may be removed. In some embodiments, steps 502 and 503 may be repeated with one or more second syringes 200 to complete pre-mixing of two or more medicaments, which are then infused together via the first syringe 100.

Through using the dual chamber syringe assembly 10 of the present application, the premixing operation is accomplished directly within the syringe assembly, reducing the use of other medical consumables and reducing the risk of contamination of the medicament.

FIG. 6 illustrates a flow diagram of a dual chamber syringe assembly during a pre-filled supplemental injection operation according to an embodiment of the present application. In this medical scenario, the same patient needs to be infused with different agents in successive passes, or the venous catheter needs to be flushed with different agents. The dual chamber syringe assembly 10 of the present application is capable of somewhat simplifying operation in such scenarios. In a pre-filled supplemental injection operation as shown in fig. 6, at step 601, the first syringe 100 is filled with a first medicament and an infusion operation is initiated. At step 602, the first plunger 120 has been fully advanced to the distal end, completing the infusion of the first medicament and the first syringe 100 has not been withdrawn for a while after completing the infusion.

At step 603, the first syringe 100 remains stationary and the second syringe 200, pre-filled with medicament, enters the chamber 121 of the first plunger 120 of the first syringe 100. At step 604, the second needle 250 penetrates the first seal 130. In some embodiments, the length of the second needle 250 is such that after penetrating the first seal 130, its forwardmost end is within the first adaptor 140 without coming into contact with the trailing end of the first needle 150, thereby avoiding the risk of collision and breakage. Injection of the second medicament is then performed by pushing the second plunger 220. Due to the elasticity of the first seal 130, the first seal 130 is able to seal around the second needle 250 when the second needle 250 penetrates the first seal 130, such that the medicament infused through the second needle 250 can only flow out through the first needle 150, completing the infusion of the second medicament.

At step 605, both medicaments have been infused, and the first syringe 100 and the second syringe 200 may be removed together. In some embodiments, steps 603 and 604 may be repeated with a plurality of second syringes 200 to complete a supplemental injection of two or more pre-filled medicaments.

By using the dual chamber syringe assembly 10 of the present application, infusion of multiple medicaments can be accomplished by only one puncture of a patient or injection site (e.g., a fluid replacement plug) of a medical line, reducing the number of direct punctures to the patient can alleviate the patient's pain, reducing the number of punctures to the injection site can reduce debris that may enter the patient's body during the puncture, improving safety.

Other variations to the disclosed embodiments can be understood and effected by those skilled in the art from a study of the specification, the disclosure, the drawings, and the appended claims. Any reference signs in the claims shall not be construed as limiting the scope.

Claims (7)

1. A dual chamber syringe assembly, said dual chamber syringe assembly comprising:

a first injector comprising a first syringe, a first plunger adapted to slide within the first syringe, a first seal attached to a distal end of the first plunger, and a first adapter at a distal end of the first syringe, wherein the first adapter is configured to engage with a first needle or a first end cap;

a second syringe comprising a second barrel, a second plunger adapted to slide within the second barrel, a second seal attached to a distal end of the second plunger, and a second adapter at a distal end of the second barrel, wherein the second adapter is configured to engage with a second needle or a second end cap;

wherein the first plunger has a chamber sized and shaped to receive and slide the second syringe inside the first plunger.

2. The dual chamber syringe assembly of claim 1 wherein the distal end of the first plunger is configured with an annular groove for receiving at least a portion of the first seal.

3. The dual chamber syringe assembly of claim 2 wherein the distal sidewall of the annular recess of the first plunger has a chamfer.

4. The dual chamber syringe assembly of claims 2 or 3 wherein the first seal has a tapered portion and a hollow cylindrical portion, wherein the inner surface of the cylindrical portion is provided with an annular protrusion configured to be adapted to engage into an annular groove of the first plunger.

5. The dual chamber syringe assembly of any of claims 1-3 wherein the first plunger has a flange at a proximal end and the outer surface of the first plunger has a tapered portion extending from 15mm to 25mm from the flange toward the flange and tapering in diameter.

6. The dual chamber syringe assembly of any of claims 1-3 wherein the first seal is made of an elastomeric material.

7. The dual chamber syringe assembly of any of claims 1-3 wherein prior to use, the second syringe is prefilled with a drug and the second adapter is closed by a second endcap coupled thereto.

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