Patent Application
20220176044
This application claims priority to Chinese Patent Application No. 202011411516.7, filed Dec. 4, 2020, which is hereby incorporated by reference herein as if set forth in its entirety.
The present disclosure generally relates to medical devices, and particularly to a syringe.
Syringes are commonly and widely used medical devices, and can be used for injecting drugs into or drawing blood from a human body. In recent years, the public has become increasingly aware of the health hazards associated with needle reuse and accidental needle pickings.
In order to solve the foregoing problems, a great amount of time, effort and money has been invested by syringe manufacturers in developing syringes with safety needle designs. For example, a self-destroying syringe includes biasing structure that is configured to push the needle to deflect, which can prevent reuse of a used syringe. Although the self-destroying syringe can meet basic requirements, it is still desirable and useful to provide a new self-destroying syringe.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views.
The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings, in which like reference numerals indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references can mean “at least one” embodiment.
The terms “upper”, “lower”, “left” and “right”, indicating the orientational or positional relationship based on the orientational or positional relationship shown in the drawings, are merely for convenience of description, but are not intended to indicate or imply that the device or elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. The terms “first” and “second” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of “multiple” is two or more, unless expressly stated otherwise.
Referring to
Since one end of the plunger 2 defines the first receiving chamber 21 and the second receiving chamber 22, and the first receiving chamber 21 has a sectional area that is less than a sectional area of the second receiving chamber 22, a step structure is formed in the plunger 2. When the liquid in the syringe barrel 1 is injected into the body to be injected, the plunger 2 will be pushed toward the pull-back member 3. After the plunger 2 has traveled a predetermined distance, the engagement portion 31 starts to move into the first receiving chamber 21. After passing through the first receiving chamber 21, the engagement portion 31 snap-fits into the second receiving chamber 22, and abuts against the step surface formed between the first receiving chamber 21 and the second receiving chamber 22, which firmly couple the engagement portion 31 to the plunger 2. Since the first receiving chamber 21 is enclosed by a closed curved surface, when the engagement portion 31 of the pull-back member 3 passes through the first receiving chamber 21 and enters the second receiving chamber 22, no elastic deformation occurs at the closed curved surface, so that the engagement portion 31 does not deflect at the first receiving chamber 21. Thus, it is fully guaranteed that when the plunger 2 drives the pull-back member 3 to retreat, the force exerted by the abutment structure 23 completely acts on the pull-back member 3 and the needle 5, so that the pull-back member 3 and the needle 5 can be completely deflect from the axis L of the syringe barrel 1. That is, the needle 5 deflects toward the inner wall of the syringe barrel 1, which effectively achieves the effect of self-destruction, and prevents reuse of the disposable syringe.
Referring to
In one embodiment, the first elastic end 311 and the second elastic end 312 each may include an inclined surface that enables the engagement portion 31 to pass through the first receiving chamber 21. This arrangement also avoids jamming during the insertion process of the plunger 2. Since the syringe is a part that acts on the human body, the first elastic end 311 and the second elastic end 312 provided with inclined surfaces can prevent persons to be injected from feeling pricking due to the vibration generated when the plunger 2 is connected to the pull-back member 3.
Referring to
The opening 24 provides a receiving space for the first elastic end 311 and the second elastic end 312. In one embodiment, the opening 24 can be a blind hole. That is, the opening 24 may not pass through the lateral wall of the second receiving chamber 22.
In another embodiment, the opening 24 can be a through hole. That is, the opening 24 may not pass through the lateral wall of the second receiving chamber 22. This configuration can better fix the first elastic end 311 and the second elastic end 312, thereby ensuring the stability of the connection.
In one embodiment, the abutment structure 23 is a protrusion formed on the inner surface of the second receiving chamber 22. When the engagement portion 31 is inserted into the second receiving chamber 22, the engagement portion 31 is pressed by the protrusion (i.e., the abutment structure 23), so that the protrusion exerts a force on the engagement portion 31 when the plunger 2 drives the pull-back member 3 to retreat, which causes the pull-back member 3 and the needle 5 to deflect from the axis L of the needle 5, thereby achieving the self-destruction of the syringe.
In another embodiment, the abutment structure 23 may be a protruding boss provided on an inclined surface of one of the first elastic end 311 and the second elastic end 312.
Referring again to
In one embodiment, the pull-back member 3 includes a first protrusion 32, and the needle holder 6 includes a second protrusion 61 on an inner surface thereof. The second protrusion 61 is configured to prevent the pull-back member 3 from moving toward an inside of the syringe barrel 1 by a force from the needle 5, which prevents the pull-back member 3 connected to the needle 5 from being pushed out due to the excessive pushing force applied to the plunger 2.
In one embodiment, a sealing structure 4 is arranged around the first protrusion 32. The sealing structure 4 may be a sealing O-ring. The arrangement of the sealing ring prevents the injection liquid from leaking from the connection between the needle holder 6 and the pull-back member 3, thereby protecting the sealing performance of the syringe.
In one embodiment, the pull-back member 3 may include a protruding portion 33 on an outer surface of one end away from the engagement portion 31. The protruding portion 33 is provided to counteract the reaction force when the syringe is injecting a person.
Referring again to
Although the features and elements of the present disclosure are described as embodiments in particular combinations, each feature or element can be used alone or in other various combinations within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202011411516.7 | Dec 2020 | CN | national |
