CN113995917B

CN113995917B - Injection syringe

Info

Publication number: CN113995917B
Application number: CN202111298522.0A
Authority: CN
Inventors: 周健; 仇锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2023-07-14
Anticipated expiration: 2041-11-04
Also published as: CN113995917A

Abstract

The invention provides a syringe. The injector comprises a needle cylinder and a needle plug, wherein the needle plug comprises an outer needle plug and an inner needle plug; the two ends of the inner needle bolt are respectively sleeved in the needle cylinder and the outer needle bolt, and the inner needle bolt and the needle cylinder and the outer needle bolt form a first chamber and a second chamber respectively; the inner pintle is provided with a first opening communicated with the first chamber; the outer pintle is provided with a second opening communicated with the second chamber; the outer pintle is resiliently coupled to the inner pintle and is adapted to drive the inner pintle relative to the barrel to compress the first chamber and to move relative to the inner pintle to compress the second chamber when the first chamber is compressed such that the first aperture and the second aperture at least partially overlap to depressurize the first chamber. By adopting the invention, when the injection pressure is too high, the first opening and the second opening are at least partially overlapped, so that the injection liquid in the first cavity overflows outwards through the overlapped part of the first opening and the second opening, and the pressure of the first cavity is relieved to reduce the injection pressure.

Description

Injection syringe

Technical Field

The invention relates to the field of medical instruments, in particular to an injector.

Background

The injector is a common clinical therapeutic instrument, which is suitable for drug injection therapy, local anesthesia administration, direct injection therapy of lesion sites and the like. During use, i.e. when using a syringe to inject a medication into an object to be operated, such as a patient, care is often taken with respect to the pressure in the injection line. In particular, in some surgical procedures, injection pressure is a critical parameter that often determines success or failure of the treatment.

However, in the clinical practice, the magnitude of the injection pressure is often controlled only by the feeling of the user, and no objective standard control is available, which often results in the injection pressure being too high. In surgery, too high injection pressure is likely to cause damage to the tissue or organ at the treatment site of the patient.

Disclosure of Invention

The technical problem solved by the embodiment of the invention is mainly how to avoid the over-high injection pressure in the using process of the injector.

In order to solve the above technical problems, embodiments of the present invention provide an improved syringe. The injector comprises a needle cylinder and a needle plug, wherein the needle plug comprises an outer needle plug and an inner needle plug; the two ends of the inner needle bolt are respectively sleeved in the needle cylinder and the outer needle bolt, and the inner needle bolt and the needle cylinder and the outer needle bolt form a first chamber and a second chamber respectively; the inner pintle is provided with a first opening communicated with the first chamber; the outer pintle is provided with a second opening communicated with the second chamber; the outer pintle is resiliently coupled to the inner pintle and is adapted to drive the inner pintle relative to the barrel to compress the first chamber and to move relative to the inner pintle to compress the second chamber when the first chamber is compressed such that the first aperture and the second aperture at least partially overlap to depressurize the first chamber.

Optionally, the needle cylinder, the inner pintle and the outer pintle are coaxially arranged; both the inner pintle and the outer pintle are adapted to move in an axial direction.

Optionally, the inner and outer pins comprise an inner pin chamber and an outer pin chamber, respectively; one end of the inner pintle chamber is opened to be communicated with the needle cylinder so that the needle cylinder and the inner pintle chamber form a first chamber together; the other end of the inner pintle chamber is sealed and sleeved in the outer pintle chamber to define a second chamber in the outer pintle chamber; one end of the outer pintle chamber is open to receive the other end of the inner pintle chamber; the other end of the outer pintle chamber is closed.

Optionally, the side wall of the inner pintle chamber is provided with a first opening; the side wall of the outer pintle chamber is provided with a second opening; one of the first and second openings is adapted to be disposed along an axial direction, and the other is adapted to be disposed in a spiral arc around the axial direction.

Alternatively, the helical arc is continuous or intermittent.

Optionally, the one is provided with a scale alignment mark; the other one is provided with a scale; the scale pair Ji Biaoshi is adapted to align with a corresponding scale value in the scale when the first and second apertures are coincident to indicate an injection pressure scale value corresponding to the current injection pressure.

Optionally, the scale comprises an injection pressure scale.

Optionally, a sealing ring is arranged on the periphery of the side wall of one end of the inner pintle chamber so as to connect the inner pintle and the needle cylinder in a sealing way.

Optionally, the syringe further comprises an elastic member adapted to elastically connect the inner pintle and the outer pintle; the elastic piece is positioned in the second chamber, one end of the elastic piece is connected with the outer side of the other end of the inner pintle chamber, and the other end of the elastic piece is connected with the inner side of the other end of the outer pintle chamber.

Optionally, the syringe further comprises an elastic member adapted to elastically connect the inner pintle and the outer pintle; the elastic piece is positioned between the inner needle bolt and the needle cylinder, one end of the elastic piece is connected with the outer side of one end of the inner needle bolt cavity, and the other end of the elastic piece is connected with the outer side of one end of the outer needle bolt cavity.

Optionally, the first chamber is adapted to contain an injection liquid; the syringe includes a needle in communication with the first chamber; the needle is adapted to be compressed in the first chamber to deliver the injectate out of the barrel.

Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effects.

For example, during injection, not only can injection be performed by pushing the outer pintle, but also the first opening and the second opening can be at least partially overlapped when the injection pressure is too high, so that the injection liquid in the first cavity can overflow outwards through the overlapped part of the first opening and the second opening to decompress the first cavity and reduce the injection pressure.

For another example, the scale alignment mark may be aligned with a corresponding scale value in the scale when the first aperture and the second aperture are overlapping to indicate an injection pressure scale value corresponding to the current injection pressure, thereby helping the user determine the magnitude of the current injection pressure.

For another example, since different application scenarios may have different injection pressure thresholds, the first and second apertures may be overlapped to depressurize the first chamber when the injection pressure of the injector reaches the corresponding injection pressure threshold.

For another example, by providing a sealing ring, the barrel and the inner pintle may be sealingly connected to prevent the injection fluid in the first chamber from escaping from the gap between the inner pintle and the barrel.

Drawings

FIG. 1 is a cross-sectional view of a syringe in which the syringe is left-facing and right-facing from the head to the tail, in accordance with an embodiment of the present invention;

FIG. 2 is a partial schematic view of the combined outer and inner pintle of an embodiment of the present invention wherein the first and second apertures are misaligned and the head and tail of the inner and outer pintle are facing upward and the tail is facing downward;

FIG. 3 is another partial schematic view of the combined outer and inner pintle according to an embodiment of the present invention wherein the first and second openings partially overlap and the inner and outer pintle have their head portions facing upward and their tail portions facing downward;

FIG. 4 is a partial schematic view of an outer pintle according to an embodiment of the present invention, with the head of the outer pintle facing upward and the tail facing downward;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 6 is a cross-sectional view taken along line B-B of fig. 3.

Detailed Description

In order to make the objects, features and advantageous effects of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the following detailed description is merely illustrative of the invention, and not restrictive of the invention.

Fig. 1 is a cross-sectional view of a syringe in an embodiment of the invention, with the head of the syringe facing left and the tail facing right.

Referring to fig. 1, an embodiment of the present invention provides a syringe.

Specifically, the injector includes a barrel 001 and a pintle.

In a specific implementation, the needle cylinder 001 is a hollow structure with two open ends, one end of which corresponds to the head of the syringe and is provided with a needle communicating with the outside, and the other end of which corresponds to the tail of the syringe and is adapted to receive a pintle.

In an embodiment of the invention, the pintle includes an outer pintle 002 and an inner pintle 003; two ends of the inner pintle 003 are respectively sleeved in the needle cylinder 001 and the outer pintle 002, and the inner pintle 003 and the needle cylinder 001 and the outer pintle 002 respectively form a first chamber and a second chamber C; the inner pintle 003 is provided with a first aperture 005 in communication with the first chamber; the outer pintle 002 is provided with a second aperture 006 in communication with the second chamber C; the outer pintle 002 is resiliently coupled to the inner pintle 003 and the outer pintle 002 is adapted to be urged by an external force F to drive the inner pintle 003 to move relative to the barrel 001 to compress the first chamber and the outer pintle 002 is further adapted to move relative to the inner pintle 003 to compress the second chamber C to at least partially overlap the first and

second apertures

005, 006 to depressurize the first chamber.

In particular implementations, the first chamber includes a syringe chamber a and an inner pintle chamber B in communication and is adapted to contain an injection solution. The needle of the syringe 001 communicates with the first chamber, and the needle is adapted to output the injection liquid out of the syringe 001 when the first chamber is compressed, to complete the injection operation.

During injection, not only can injection be performed by pushing the outer pintle 002, but also the outer pintle 002 can be moved relative to the inner pintle 003 when the injection pressure M is too high to enable the first aperture 005 and the second aperture 006 to at least partially overlap, so that the injection liquid in the first chamber overflows outwards through the overlapping part of the first aperture 005 and the second aperture 006 to release the pressure in the first chamber to reduce the injection pressure M.

In some embodiments, barrel 001, inner pintle 003 and outer pintle 002 are all hollow structures and coaxially disposed. In this case, both the inner pintle 003 and the outer pintle 002 are adapted to move in the axial directions of the three.

In a specific implementation, two ends of the inner pintle 003 are respectively sleeved in the needle cylinder 001 and the outer pintle 002, and the inner pintle 003 respectively forms a first chamber and a second chamber C with the needle cylinder 001 and the outer pintle 002.

Specifically, syringe 001 includes a syringe chamber a, and inner pintle 003 includes an inner pintle chamber B. The inner pintle chamber B is open at one end (head end) and is sleeved in the syringe chamber a to communicate the syringe chamber a and the inner pintle chamber B, so that the syringe chamber a and the inner pintle chamber B form a first chamber together. The first chamber is adapted to contain an injection liquid and is in communication with the needle of the barrel 001.

The outer pintle 002 includes an outer pintle chamber. One end (head end) of the outer pintle chamber is open to receive the other end (tail end) of the inner pintle chamber B, both the other end (tail end) of the inner pintle chamber B and the other end (tail end) of the outer pintle chamber are closed, and the other end (tail end) of the inner pintle chamber B is sleeved in the outer pintle chamber to define a second chamber C in the outer pintle chamber.

In particular embodiments, the outer periphery of the sidewall of one end (head end) of the inner pintle chamber B is also provided with a sealing ring 007 to sealingly connect the inner pintle 003 and the barrel 001.

In some embodiments, sealing ring 007 may comprise rubber nipple. The rubber nipple can be adhered and fixed on the periphery of the side wall of one end (head end) of the inner pintle chamber B and closely attached to the inner side wall of the needle cylinder chamber A so as to be in sealing connection with the inner pintle 003 and the needle cylinder 001, thereby avoiding the overflow of the injection liquid in the first chamber from the gap between the inner pintle 003 and the needle cylinder 001.

In particular embodiments, the inner pintle 003 is adapted to move the sealing ring 007 relative to the barrel 001 under the actuation of the outer pintle 002 to compress the first chamber such that the injectate in the first chamber is delivered from the needle of the barrel 001. When the sealing ring 007 moves relative to the syringe 001, the sealing ring is always tightly attached to the inner side wall of the syringe chamber A so as to connect the inner needle latch 003 and the syringe 001 in a sealing way, thereby avoiding the injection liquid in the first chamber from overflowing from the gap between the inner needle latch 003 and the syringe 001.

In an embodiment of the present invention, there is an elastic connection between the inner pintle 003 and the outer pintle 002.

In an implementation, the syringe further comprises a resilient member 004 adapted to resiliently connect the inner needle latch 003 and the outer needle latch 002. The elastic member 004 is adapted to be compressed in the axial direction of the inner needle latch 003 and the outer needle latch 002 by the external force F and to resume the compression when the external force F is removed.

In some embodiments, the resilient member 004 may be disposed within the second chamber C. One end of the elastic member 004 is connected to the outer side (outer end face) of the other end (tail end) of the inner pintle chamber B, and the other end of the elastic member 004 is connected to the inner side (inner end face) of the other end (tail end) of the outer pintle chamber, so that the inner pintle 003 and the outer pintle 002 are elastically connected.

In some embodiments, the resilient member 004 may also be disposed between the inner pintle 003 and the barrel 001. One end of the elastic member 004 is connected to the outside of one end (head end) of the inner pintle chamber B, and the other end is connected to the outside of one end (head end) of the outer pintle chamber. For example, both ends of the elastic member 004 may be connected to the end surfaces of one end (head end) of the seal ring 007 and the outer pintle 002, respectively.

In some embodiments, the resilient member 004 may comprise a spring. For example, a metal pressure spring.

In other embodiments, the resilient member 004 may further comprise a rubber post or rubber ring having elasticity.

In particular implementations, the outer pintle 002 is adapted to be urged against the barrel 001 by an external force F to compress the resilient member 004, and to drive the inner pintle 003 to move against the barrel 001 to compress the first chamber when the resilient member 004 is compressed to some extent.

Specifically, outer pintle 002 is adapted to be pushed in a direction that the tail of the syringe is directed toward the head thereof, thereby driving inner pintle 003 to move in the same direction to compress the first chamber, thereby causing the injectate within the first chamber to be output outwardly from the needle of barrel 001. The operation of pushing the outer pintle 002 to cause the injection liquid in the first chamber to be output outwardly from the needle is similar to that of a syringe commonly used in the art.

FIG. 2 is a partial schematic view of the combined outer and inner pintle of an embodiment of the present invention in which the first and second apertures are misaligned and the inner and outer pintle have a head portion facing upward and a tail portion facing downward. FIG. 3 is another partial schematic view of the combined outer and inner pintle according to an embodiment of the present invention wherein the first and second apertures partially overlap and the inner and outer pintle have a head portion facing upward and a tail portion facing downward. FIG. 4 is a partial schematic view of an outer pintle according to an embodiment of the present invention, with the head of the outer pintle facing upward and the tail facing downward.

Referring to fig. 1 to 4, the sidewall of the interior pintle chamber B is provided with a first aperture 005. The sidewall of the outer pintle chamber is provided with a second aperture 006.

In some embodiments, one of the first and

second apertures

005, 006 is adapted to be disposed along an axial direction, and the other is adapted to be disposed in a helical arc about the axial direction. For example, in the example shown in fig. 2 to 4, the first opening 005 is an elongated opening provided in the axial direction, and the second opening 006 is an arc-shaped opening provided in a spiral arc shape around the axial direction.

Referring to fig. 2 and 3, in some embodiments, the helical arc may be continuous.

Referring to fig. 4, in other embodiments, the helical arc may also be intermittent.

It should be noted that in some embodiments, the number of angles corresponding to the spiral arc may be less than 360 degrees or 180 degrees.

In particular implementations, the inner pintle 003 is provided with scale alignment marks 008 at the first aperture 005. Accordingly, the outer pintle 002 is provided with graduations 009 at the second aperture 006.

In some embodiments, graduations 009 may include an injection pressure graduation. Different injection pressure scale values are used to represent different injection pressures. And, the injection pressure scale value gradually increases along the direction that the head of the injector points to the tail of the injector.

In implementations, the scale 009 may include a range of ranges of scale values. For example, the injection pressure scale may include a plurality of injection pressure scale values within a [150mmHg,300mmHg ] interval, and the adjacent injection pressure scale values may differ by 30mmHg, so the injection pressure scale may include 150mmHg, 180mmHg, 210mmHg, 240mmHg, 270mmHg, 300mmHg of these injection pressure scale values.

In particular implementations, the scale alignment marks 008 are adapted to align with corresponding scale values in the scale 009 when the first and

second apertures

005, 006 are coincident to indicate the injection pressure M corresponding to the current injection pressure.

When the first chamber contains the injection liquid and the injection operation is not started, the first aperture 005 of the inner pintle 003 and the second aperture 006 of the outer pintle 002 do not overlap, and the scale alignment marks 008 of the first aperture 005 and the scales 009 of the second aperture 006 are not aligned, as can be seen in the examples shown in fig. 2 and 5.

When an injection operation is started, that is, the outer pintle 002 is pushed to move relative to the syringe 001 to compress the elastic member 004 and the elastic member 004 is compressed to a certain extent to drive the inner pintle 003 to move relative to the syringe 001, the first chamber is compressed and the injection liquid in the first chamber is output from the needle of the syringe 001. At this point, injection begins.

During injection, outer pintle 002 continues to be pushed to cause the injectate in the first chamber to continue to be output outwardly from the needle of barrel 001.

As the injection proceeds, the pressure in the first chamber increases gradually, as does the injection pressure M. However, during injection, too high an injection pressure M is disadvantageous.

For different application scenarios (e.g. different surgery, different patients, different injection parts, etc.), there may be different injection pressure thresholds, when the injection pressure M exceeds the corresponding injection pressure threshold, the injection pressure M may be considered too high.

Due to the elastic connection between the outer pintle 002 and the inner pintle 003, as the injection pressure M increases gradually, the outer pintle 002 is further adapted to move relative to the inner pintle 003 to compress the second chamber C such that the first aperture 005 and the second aperture 006 at least partially overlap, thereby allowing the injection fluid within the first chamber to escape along the overlapping portion of the first aperture 005 and the second aperture 006 to depressurize the first chamber and thereby reduce the injection pressure M, as illustrated in the example of fig. 3.

Further, when the first aperture 005 and the second aperture 006 start to overlap, pushing the outer pintle 002 may be stopped, and the outer pintle 002 may be rotated relative to the inner pintle 003, so that the scale alignment mark 008 at the first aperture 005 is aligned with the scale value at the second aperture 006, thereby facilitating reading of the corresponding injection pressure scale value under the current injection pressure, so as to facilitate the user to determine the current corresponding injection pressure M.

When the current injection pressure does not reach the corresponding injection pressure threshold, outer pintle 002 may be rotated relative to inner pintle 003 and first aperture 005 and second aperture 006 may be misaligned while outer pintle 002 continues to be pushed to continue to increase injection pressure M until the corresponding injection pressure threshold is reached, first aperture 005 and second aperture 006 may be misaligned to depressurize the first chamber.

In this manner, it may be determined when to overlap the first and second openings to depressurize the first chamber based on the respective injection pressure thresholds. I.e. the injection pressure M does not start to depressurize the first chamber until the injection pressure M reaches the corresponding injection pressure threshold, but does not depressurize the first chamber until the injection pressure M does not reach the corresponding injection pressure threshold.

In some embodiments, the position at which the first and

second openings

005 and 006 start to overlap may also be set based on the injection pressure threshold, for example, the position at which the first and

second openings

005 and 006 start to overlap may be controlled by adjusting the distance of the first and

second openings

005 and 006 in the axial direction (the distance when injection is not started) based on the injection pressure threshold. Moreover, the first opening 005 and the second opening 006 do not overlap when the injection pressure M does not reach the corresponding injection pressure threshold, and the first opening 005 and the second opening 006 can start to overlap to depressurize the first chamber when the injection pressure M reaches the corresponding injection pressure threshold.

In some embodiments, an external force F acts on the outer pintle 002, pressing one end of the resilient member 004 through the outer pintle 002; after the elastic member 004 is pressed, the other end drives the inner pintle 003 to move. The magnitude of the external force F determines the magnitude of the pressure applied to one end of the elastic member 004, so as to determine the magnitude of the pressure applied to the injection liquid in the first chamber when the other end of the elastic member 004 drives the inner needle 003 to move, i.e. determine the magnitude of the injection pressure M. The larger the external force F is, the larger the pressure applied to one end of the elastic member 004 is, and the larger the injection pressure M applied to the injection liquid in the first chamber is when the other end of the elastic member 004 drives the inner pintle 003 to move. However, due to the pressure applied by the elastic member 004, one end of the elastic member acts to drive the movement of the inner needle 003, thereby completing injection of the injection liquid in the first chamber, and the other end acts on the elastic member to form elastic deformation. That is, when the external force F exceeds the injection pressure threshold, the elastic member 004 may store a force exceeding a portion outside the injection pressure threshold by its own elastic deformation to ensure that the injection pressure M satisfies the threshold requirement. Further, when the force stored in the elastic member 004 through the elastic deformation reaches a certain threshold, the elastic member can also move relatively between the outer needle bolt 002 and the inner needle bolt 003 until the first opening 005 and the second opening 006 are at least partially overlapped, so that the injection in the first cavity overflows outwards through the overlapped part to realize force release, and the injection pressure M can meet the threshold requirement. The first opening 005 and the second opening 006 are overlapped at different positions, the release force values are also different, the pressure value of the injection liquid in the first chamber acted by the external force F is also different, and the injection pressure M of the injection liquid is the scale value on the scale 009 aligned by the scale alignment mark 008 on the first opening 005.

Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the disclosure, even where only a single embodiment is described with respect to a particular feature. The characteristic examples provided in the present disclosure are intended to be illustrative, not limiting, unless stated differently. In practice, the features of one or more of the dependent claims may be combined with the features of the independent claims where technically possible, according to the actual needs, and the features from the respective independent claims may be combined in any appropriate way, not merely by the specific combinations enumerated in the claims.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. An injector comprising a barrel (001) and a pintle, characterized in that the pintle comprises an outer pintle (002) and an inner pintle (003); the two ends of the inner needle bolt (003) are respectively sleeved in the needle cylinder (001) and the outer needle bolt (002), and the inner needle bolt (003) and the needle cylinder (001) and the outer needle bolt (002) form a first chamber and a second chamber (C) respectively; the inner pintle (003) is provided with a first opening (005) communicating with the first chamber; the outer pintle (002) is provided with a second aperture (006) in communication with the second chamber (C); the outer pintle (002) is resiliently coupled to the inner pintle (003) and is adapted to drive the inner pintle (003) to move relative to the barrel (001) to compress the first chamber and to move relative to the inner pintle (003) to compress the second chamber (C) when the first chamber is compressed to at least partially overlap the first aperture (005) and the second aperture (006) to depressurize the first chamber.

2. The injector according to claim 1, characterized in that the needle cylinder (001), the inner pintle (003) and the outer pintle (002) are coaxially arranged; the inner pintle (003) and the outer pintle (002) are each adapted to move in an axial direction.

3. The syringe of claim 2, wherein the inner needle (003) and the outer needle (002) comprise an inner needle chamber (B) and an outer needle chamber, respectively; one end of the inner pintle chamber (B) is opened to communicate with the needle cylinder (001) so that the needle cylinder (001) and the inner pintle chamber (B) form the first chamber together; the other end of the inner pintle chamber (B) is closed and sleeved in the outer pintle chamber to define the second chamber (C) in the outer pintle chamber; one end of the outer pintle chamber is open to receive the other end of the inner pintle chamber (B); the other end of the outer pintle chamber is closed.

4. A syringe according to claim 3, characterized in that the side wall of the internal pintle chamber (B) is provided with the first aperture (005); the side wall of the outer pintle chamber is provided with the second opening (006); one of the first aperture (005) and the second aperture (006) is adapted to be disposed along an axial direction, and the other is adapted to be disposed in a spiral arc around the axial direction.

5. The syringe of claim 4, wherein the helical arc is continuous or intermittent.

6. The syringe of claim 4, wherein said one is provided with a scale alignment mark (008); said other is provided with a scale (009); the scale alignment mark (008) is adapted to align with a corresponding scale value in the scale (009) when the first aperture (005) and the second aperture (006) are coincident to indicate an injection pressure scale value corresponding to a current injection pressure.

7. The syringe of claim 6, wherein the scale (009) comprises an injection pressure scale.

8. A syringe according to claim 3, characterized in that the outer periphery of the side wall of one end of the inner pintle chamber (B) is provided with a sealing ring (007) to sealingly connect the inner pintle (003) and the barrel (001).

9. A syringe according to claim 3, comprising an elastic element (004) adapted to elastically connect said inner pintle (003) and said outer pintle (002); the elastic piece (004) is positioned in the second chamber (C), one end of the elastic piece is connected with the outer side of the other end of the inner pintle chamber (B), and the other end of the elastic piece is connected with the inner side of the other end of the outer pintle chamber.

10. A syringe according to claim 3, comprising an elastic element (004) adapted to elastically connect said inner pintle (003) and said outer pintle (002); the elastic piece (004) is positioned between the inner pintle (003) and the needle cylinder (001), one end of the elastic piece is connected with the outer side of one end of the inner pintle chamber (B), and the other end of the elastic piece is connected with the outer side of one end of the outer pintle chamber.

11. The syringe of any one of claims 1 to 10, wherein the first chamber is adapted to contain an injection liquid; the barrel (001) comprises a needle in communication with the first chamber; the needle is adapted to be compressed in the first chamber to deliver the injection out of the barrel (001).