CN112891680A

CN112891680A - Be used for biological medicament weight safety injection device

Info

Publication number: CN112891680A
Application number: CN202110236473.1A
Authority: CN
Inventors: 牛绍富
Original assignee: Hangzhou Lairan Trading Co ltd
Current assignee: Hangzhou Lairan Trading Co ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-06-04

Abstract

The invention relates to the field of medicament injection, in particular to a biological medicament component safety injection device which comprises a gun body, wherein an open cavity with an outward opening is arranged in the gun body, an injection shell is arranged in the open cavity in a sliding mode, and an injection needle is fixedly arranged at one end of the injection shell, which extends out of the open cavity and faces to the outward opening side.

Description

Be used for biological medicament weight safety injection device

Technical Field

The invention relates to the technical field of medicament injection, in particular to a safe injection device for biological medicament component.

Background

At present, a plurality of medicament injection guns can only inject medicaments according to a fixed quantity, when some strange organisms are injected with the medicaments, the health of the organisms is easily affected due to overlarge medicament quantity when the medicament injection quantity of the organisms is unknown, even the injection fails due to too small injection quantity of the organisms, for example, when some wild animals such as bison, tiger, lion and the like are rescued, the wild animals need to be anesthetized to prevent the wild animals from hurting people, and meanwhile, in order to ensure the physical health of the wild animals, the anesthetic quantity needs to be controlled to prevent too much injection.

The present application describes a safe injection device for biologic agent dosage that addresses the above-mentioned problems.

Disclosure of Invention

The invention provides a safe injection device for biological medicament component, which solves the technical problem.

The above object of the present invention is achieved by the following technical solutions: a safe injection device for biological medicament component comprises a gun body, wherein an opening cavity with an outward opening is arranged in the gun body, an injection shell is arranged in the opening cavity in a sliding mode, and an injection needle head is fixedly arranged on one end of the injection shell, which extends out of the opening cavity, towards the outward opening;

a medicament storage cavity is arranged in the injection shell and is communicated with the injection needle, a sliding disc is arranged on the periphery of the injection needle in a sliding mode, and a pushing block is arranged in the medicament storage cavity in a sliding mode;

the end face of the pushing block close to one side of the end wall of the open cavity is fixedly provided with a connecting spring, one end of the connecting spring close to the end wall of the open cavity is fixedly provided with a pushing plate which is slidably installed in the medicament storage cavity, and one side of the pushing plate close to the end wall of the open cavity is fixedly provided with a sliding block.

Preferably, a buffering installation block is fixedly arranged in the end face of the injection shell close to one side of the end wall of the open cavity, an elastic body is arranged in the end face of the buffering installation block far away from one side of the injection shell, and the elastic body is in power connection with the end wall of the open cavity.

Preferably, the opening cavity is kept away from in the end wall that medicament stored chamber central line one side and is set firmly the pipeline that the chamber central line one side was stored to the opening towards keeping away from to the medicament, the medicament is stored the chamber and is close to linking chamber that pipeline intercommunication was equipped with on one side of the pipeline, it is close to link up the intracavity end wall in the opening the closed chamber of buffering installation piece one side, the closed chamber is kept away from reset spring has set firmly on the end wall of buffering installation piece one side, reset spring is close to buffering installation piece one end set firmly slidable mounting in the closed chamber with link up the closed block between the chamber, the closed block is close to the terminal surface of buffering installation piece one side with the end wall butt in opening cavity, be equipped with the intercommunication in the closed block the pipeline with the medicament stores the through hole.

Preferably, the medicament storage cavity is close to buffer installation piece one side is equipped with the adjustment motor chamber, sliding block slidable mounting is in between medicament storage cavity and the adjustment motor chamber, the sliding block is close to be equipped with the opening in the terminal surface of buffer installation piece one side and towards the thread groove of buffer installation piece one side, thread groove female connection is equipped with the threaded spindle, the adjustment motor chamber is close to the terminal surface internal fixation of buffer installation piece one side has the adjustment motor, the adjustment motor chamber with adjustment motor power is connected.

Preferably, a support plate is fixedly arranged on the periphery of the injection shell and positioned on one side of the gun body far away from the buffering installation block, three fixed needles arranged in a circumferential array are fixedly arranged on the end surface of one side of the supporting plate far away from the buffering mounting block, the two sides of the medicament storage cavity are symmetrically provided with connecting cavities with openings facing away from one side of the buffer mounting block, a sliding rod is arranged at the opening of the connecting cavity in a sliding manner, one end of the sliding rod, which is far away from the buffering mounting block, is fixedly connected with the end face of the sliding disc, a connecting plate is arranged in the connecting cavity in a sliding manner, one end of the sliding rod, far away from the sliding disc, is fixedly connected with the connecting plate, and a compression spring is fixedly arranged on the end surface of the connecting plate, which is far away from one side of the sliding disc, and one end of the compression spring, which is far away from the sliding disc, is fixedly arranged on the end wall of the connecting cavity, which is far away from one side of the sliding disc.

Preferably, the adjustment motor cavity both sides symmetry be equipped with the extension chamber of chamber intercommunication is stored to the medicament, extend the chamber and keep away from adjustment motor cavity central line one side is equipped with the opening and is close to the rack chamber of opening chamber end wall one side, the rack chamber is kept away from link up the spring has set firmly on the end wall of opening chamber end wall one side, link up the spring and be close to opening chamber end wall one end set firmly slidable mounting in the rack intracavity remove the rack, it is close to remove the rack opening chamber end wall one end with opening chamber end wall butt, extend the chamber with medicament stores sliding mounting is equipped with the slip rack between the chamber, the slip rack is kept away from buffering installation piece one end runs through the slurcam with slurcam fixed connection, the slip rack with slurcam sliding connection.

Preferably, the sliding rack is in meshed connection with the moving rack through a rotating gear, the rotating gear is fixedly mounted on a rotating shaft, and the rotating shaft is rotatably mounted in an end wall between the rack cavity and the extension cavity.

Preferably, the movable rack is far away from a clamping groove with an outward opening is formed in the end face of one side of the central line of the medicament storage cavity, a clamping spring is fixedly arranged on the end wall of one side of the central line of the medicament storage cavity, the clamping spring is far away from one end of the central line of the medicament storage cavity, a clamping block is fixedly arranged in the clamping groove in a sliding mode, the clamping block is close to the end face of one side of the buffering installation block and is an arc face, the tooth rack cavity is far away from the end wall of one side of the central line of the medicament storage cavity, a connecting groove is formed in the end wall of one side of the central line of the medicament storage cavity in a.

Preferably, the spread groove is kept away from medicament storage cavity central line one side be equipped with connect the removal chamber that the chamber communicates, the pressure plate is kept away from medicament storage cavity central line one side's terminal surface has set firmly the joint pole, the joint pole slidable mounting in the spread groove with remove between the chamber, remove the chamber with connect chamber intercommunication department slidable mounting and be equipped with the connecting block, the connecting block is kept away from buffer installation piece one end with connecting plate fixed connection, the connecting block is close to buffer installation piece one end has set firmly fixed spring, fixed spring is close to buffer installation piece one end has set firmly slidable mounting in connect the chamber with remove the linking piece between the chamber, it is close to link piece buffer installation piece one end with the joint pole is kept away from pressure plate one end is articulated through the hinge bar.

The invention has the beneficial effects that: the invention can better control the injection amount of the medicament when some strange organisms inject the medicament, thereby preventing the health of the organisms from being influenced because of overlarge medicament injection amount, and the fixed needle can better fix the gun body in the organisms to be injected, and prevent the gun body from being separated under the action of some external force.

Drawings

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

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

3 FIG. 32 3 is 3 a 3 schematic 3 view 3 of 3 A 3- 3 A 3 of 3 FIG. 31 3 according 3 to 3 an 3 embodiment 3 of 3 the 3 present 3 invention 3; 3

FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1 according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of the structure at C in FIG. 2 according to an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of the structure at D in FIG. 2 according to an embodiment of the present invention;

fig. 6 is an enlarged schematic view of the structure at E in fig. 2 according to the embodiment of the present invention.

FIG. 7 is a schematic view of the state in which the fixed needle and the injection needle are inserted into the body of an animal;

fig. 8 is an enlarged schematic view of the structure at F in fig. 7 according to the embodiment of the present invention.

In the figure: 10-fixed needle, 11-sliding disk, 12-injection needle, 13-injection housing, 14-medicament storage chamber, 15-gun body, 16-tube, 17-open chamber, 18-buffer mounting block, 19-elastic body, 20-adjustment motor, 21-adjustment motor chamber, 22-threaded shaft, 23-sliding rod, 24-connecting chamber, 25-compression spring, 26-engaging chamber, 27-closing block, 28-return spring, 29-closing chamber, 30-through hole, 31-pushing block, 32-connecting spring, 33-pushing plate, 35-threaded groove, 36-connecting block, 37-connecting plate, 38-engaging spring, 39-moving rack, 40-rotating gear, 41-rotating shaft, 42-sliding rack, 43-engaging block, 44-hinged rod, 45-moving cavity, 46-engaging rod, 47-pressure plate, 48-connecting groove, 49-clamping block, 50-clamping spring, 51-clamping groove, 52-sliding block, 53-extending cavity, 54-rack cavity, 56-supporting disk and 88-fixed spring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

The invention relates to a biological medicament component safety injection device, which comprises a gun body 15, wherein an opening cavity 17 with an outward opening is arranged in the gun body 15, an injection shell 13 is arranged in the open cavity 17 in a sliding way, an injection needle 12 is fixedly arranged at one end side of the injection shell 13 extending out of the open cavity 17 and facing to the outer opening side, a medicament storage cavity 14 is arranged in the injection shell 13, the medicament storage cavity 14 is communicated with the injection needle 12, a sliding disk 11 is arranged on the periphery of the injection needle 12 in a sliding way, a pushing block 31 is arranged in the medicament storage cavity 14 in a sliding way, a connecting spring 32 is fixedly arranged on the end surface of the pushing block 31 close to one side of the end wall of the open cavity 17, one end of the connecting spring 32, which is close to the end wall of the open cavity 17, is fixedly provided with a pushing plate 33 which is slidably installed in the medicament storage cavity 14, and one side of the pushing plate 33, which is close to the end wall of the open cavity 17, is fixedly provided with a sliding block 52.

Advantageously, a buffer mounting block 18 is fixedly arranged in the end face of the injection shell 13 on the side close to the end wall of the open cavity 17, a projectile body 19 is arranged in the end face of the buffer mounting block 18 on the side far away from the injection shell 13, the projectile body 19 is triggered by gunpowder to shoot the gun body 15 into a living body to be injected, and the projectile body 19 is in dynamic connection with the end wall of the open cavity 17.

Advantageously, a pipe 16 which is opened to the side far away from the center line of the medicament storage cavity 14 is fixedly arranged in the end wall of the open cavity 17 far away from the center line of the medicament storage cavity 14, the medicament storage cavity 14 is provided with an engaging cavity 26 communicated with the pipeline 16 at one side close to the pipeline 16, a closed cavity 29 with an opening facing to one side close to the buffering installation block 18 is arranged in the end wall of the engaging cavity 26, a return spring 28 is fixedly arranged on the end wall of the closed cavity 29 on the side far away from the buffering mounting block 18, one end of the return spring 28 close to the buffer mounting block 18 is fixedly provided with a sealing block 27 which is slidably mounted between the sealing cavity 29 and the engaging cavity 26, the end surface of the closing block 27 on the side close to the buffer mounting block 18 abuts against the end wall of the open cavity 17, a through hole 30 is provided in the closing block 27 to communicate between the tube 16 and the medicine storage chamber 14.

Advantageously, an adjusting motor cavity 21 is formed in the side, close to the buffer mounting block 18, of the medicine storage cavity 14, the sliding block 52 is slidably mounted between the medicine storage cavity 14 and the adjusting motor cavity 21, a threaded groove 35 with an opening facing the side, close to the buffer mounting block 18, is formed in the end surface, close to the buffer mounting block 18, of the sliding block 52, a threaded shaft 22 is arranged in the threaded groove 35 in a threaded connection manner, an adjusting motor 20 is fixedly arranged in the end surface, close to the buffer mounting block 18, of the adjusting motor cavity 21, and the adjusting motor cavity 21 is in power connection with the adjusting motor 20.

Advantageously, a support plate 56 is fixed on the periphery of the injection housing 13 on the side of the gun body 15 away from the buffer mounting block 18, three fixed needles 10 arranged in a circumferential array are fixedly arranged on the end surface of the supporting plate 56 far away from one side of the buffer mounting block 18, the medicament storage cavity 14 is symmetrically provided with connecting cavities 24 with openings facing away from the buffer mounting block 18 at two sides, a sliding rod 23 is arranged at the opening of the connecting cavity 24 in a sliding manner, one end of the sliding rod 23 far away from the buffering mounting block 18 is fixedly connected with the end face of the sliding disc 11, a connecting plate 37 is arranged in the connecting cavity 24 in a sliding way, one end of the sliding rod 23 far away from the sliding disc 11 is fixedly connected with the connecting plate 37, a compression spring 25 is fixedly arranged on the end surface of the connecting plate 37 far away from one side of the sliding disk 11, one end of the compression spring 25, which is far away from the sliding disk 11, is fixedly installed on the end wall of the connecting cavity 24, which is far away from the side of the sliding disk 11.

Advantageously, the adjustment motor cavity 21 is symmetrically provided with extension cavities 53 at both sides thereof communicating with the medicament storage cavity 14, the side of the extension cavity 53 far away from the center line of the adjustment motor cavity 21 is provided with a rack cavity 54 which is opened to the side close to the end wall of the opening cavity 17, an engaging spring 38 is fixedly arranged on the end wall of the rack cavity 54 on the side far away from the end wall of the open cavity 17, one end of the engaging spring 38 close to the end wall of the open cavity 17 is fixedly provided with a moving rack 39 which is slidably arranged in the rack cavity 54, one end of the moving rack 39 close to the end wall of the open cavity 17 abuts against the end wall of the open cavity 17, a sliding rack 42 is arranged between the extension cavity 53 and the medicament storage cavity 14 in a sliding way, one end of the sliding rack 42, which is far away from the buffer mounting block 18, penetrates through the pushing plate 33 and is fixedly connected with the pushing block 31, and the sliding rack 42 is slidably connected with the pushing plate 33.

Advantageously, the sliding rack 42 is in meshing connection with the moving rack 39 through a rotating gear 40, the rotating gear 40 is fixedly mounted on a rotating shaft 41, and the rotating shaft 41 is rotatably mounted in the end wall between the rack cavity 54 and the extension cavity 53.

Beneficially, a clamping groove 51 with an outward opening is formed in an end face of the moving rack 39 on the side far away from the center line of the medicament storage cavity 14, a clamping spring 50 is fixedly arranged on an end wall of the clamping groove 51 on the side near to the center line of the medicament storage cavity 14, a clamping block 49 slidably mounted in the clamping groove 51 is fixedly arranged at one end of the clamping spring 50 on the side far away from the center line of the medicament storage cavity 14, an end face of the clamping block 49 on the side near to the buffer mounting block 18 is an arc face, a connecting groove 48 is communicated in an end wall of the rack cavity 54 on the side far away from the center line of the medicament storage cavity 14, the clamping block 49 is slidably mounted between the connecting groove 48 and the clamping groove 51, and.

Advantageously, the side of the connecting groove 48 away from the centerline of the medicament storage chamber 14 is provided with a moving chamber 45 communicating with the connecting chamber 24, an engaging rod 46 is fixedly arranged on the end surface of the pressure plate 47 on the side far away from the center line of the medicament storage cavity 14, the joint rod 46 is slidably mounted between the connecting groove 48 and the moving cavity 45, a connecting block 36 is slidably mounted at the position where the moving cavity 45 is communicated with the connecting cavity 24, one end of the connecting block 36 far away from the buffer mounting block 18 is fixedly connected with the connecting plate 37, a fixed spring 88 is fixedly arranged at one end of the connecting block 36 close to the buffer mounting block 18, a connecting block 43 which is slidably arranged between the connecting cavity 24 and the moving cavity 45 is fixedly arranged at one end of the fixed spring 88 close to the buffer mounting block 18, the end of the joint block 43 close to the buffer mounting block 18 is hinged to the end of the joint rod 46 far from the pressure plate 47 by a hinge rod 44.

The following will describe in detail the use steps of a bio-agent dose safety injection device herein with reference to fig. 1 to 8:

in the initial state: the connecting spring 32 and the engaging spring 38 are in a compressed state;

when the work is started:

1. when a medicament injection operation such as anesthetic is required to be performed on a strange organism, the medicament to be injected is pushed into the medicament storage cavity 14 through the pipeline 16 and the connecting cavity 26, and then the injection shell 13 is aimed at the organism to be injected and is pushed out through the trigger projectile body 19 after the organism to be injected is aimed.

2. When the injection housing 13 leaves the open cavity 17, the closing block 27 is moved toward the side close to the buffer mounting block 18 by the resilient force of the return spring 28 and separates the tube 16 from the medicine storage cavity 14 by the closing block 27.

3. After the fixed needle 10 and the injection needle 12 are inserted into a living body under an impact force, the fixed needle 10 functions to better fix the injection housing 13 on the living body and prevent the injection housing 13 from dropping, when the injection needle 12 is inserted into the living body, the sliding disk 11 is driven to move towards the side close to the buffer mounting block 18, the sliding disk 11 moves towards the side close to the buffer mounting block 18, so as to drive the sliding rod 23 to move towards the side close to the buffer mounting block 18, the sliding rod 23 moves towards the side close to the buffer mounting block 18, so as to drive the connecting plate 37 to move towards the side close to the buffer mounting block 18 and compress the compression spring 25, the connecting plate 37 moves towards the side close to the buffer mounting block 18, so as to drive the connecting block 36 to move towards the side close to the buffer mounting block 18, the connecting block 36 moves towards the side close to the buffer mounting block 18 through the connecting plate 37, so as to drive the, the engaging block 43 moves toward the side close to the buffer mounting block 18, the hinge rod 44 drives the engaging rod 46 to move toward the side close to the center line of the medicine storage chamber 14, the engaging rod 46 moves toward the side close to the center line of the medicine storage chamber 14 to drive the pressure plate 47 to move toward the side close to the center line of the medicine storage chamber 14, and the pressure plate 47 moves toward the side close to the center line of the medicine storage chamber 14 to drive the latch 49 to move toward the latch groove 51 and compress the latch spring 50.

4. When the latch 49 is completely moved into the latch slot 51, the moving rack 39 is driven by the resilience of the engaging spring 38 and the connecting spring 32 to move towards the side away from the fixed needle 10, the moving rack 39 moves towards the side away from the fixed needle 10 to drive the rotating gear 40 to rotate, the rotating gear 40 rotates to drive the sliding rack 42 to move towards the side away from the buffer mounting block 18, the sliding rack 42 moves towards the side away from the buffer mounting block 18 to drive the pushing block 31 to move towards the side away from the buffer mounting block 18, the pushing block 31 moves towards the side away from the buffer mounting block 18 to drive the medicament in the medicament storage cavity 14 to push the injection needle 12 for a certain distance, thereby injecting a part of the medicament in the medicament storage chamber 14 into the living body, ensuring that a certain amount of medicament is directly injected into the living body after being launched, and preventing the medicament from falling off the injection housing 13 due to the strong struggle after the biological eating pain is accidentally caused and the medicament is not injected.

5. Then, after a period of observation, the adjustment motor 20 is started according to the biological reaction, the adjustment motor 20 drives the threaded shaft 22 to rotate, the threaded shaft 22 rotates to drive the sliding block 52 to move towards the side of the injection needle 12, the sliding block 52 moves towards the side of the injection needle 12 to drive the pushing plate 33 to move towards the side of the injection needle 12, the pushing plate 33 moves towards the side of the injection needle 12 and drives the pushing block 31 to continue to move towards the side of the injection needle 12 through the connecting spring 32, the pushing block 31 moves towards the side of the injection needle 12 to continue to inject a part of the medicament in the medicament storage cavity 14 into the organism through the injection needle 12, and then the adjustment motor 20 is closed.

6. After a period of observation, according to the biological response, the injection is completed after the injection value reaches the required value, and when the injection value has not yet reached the required value, the adjustment motor 20 is started again, so that a certain amount of injection is performed again until the injection value reaches the required value.

After the injection task is completed, the injection housing 13 is taken down, the adjusting motor 20 is controlled to start to drive the threaded shaft 22 to rotate reversely, the threaded shaft 22 rotates reversely to drive the sliding block 52 to reset, then the sealing block 27 is manually pushed to enable the pipeline 16 to be communicated with the medicament storage cavity 14 through the through hole 30, then cleaning water is injected through the pipeline 16, then the adjusting motor 20 is started to drive the threaded shaft 22 to rotate in the reciprocating forward and reverse directions, so that the sliding block 52 moves in the medicament storage cavity 14 in a reciprocating mode, and the sliding block 52 moves in the medicament storage cavity 14 in a reciprocating mode, so that the medicament storage cavity 14 is cleaned.

After the cleaning is finished, a new projectile body 19 is installed in the buffer installation block 18, the injection housing 13 is inserted into the open cavity 17 again, the closing block 27 and the moving rack 39 are driven by the bottom wall of the open cavity 17 to move towards the side close to the injection needle 12, the closing block 27 moves towards the side close to the injection needle 12 so as to compress the return spring 28 for resetting, the moving rack 39 moves towards the side close to the injection needle 12 so as to drive the pushing block 31 to reset and compress the connecting spring 32 and the engaging spring 38, and the sliding disc 11 resets under the resilience force of the compression spring 25.

Claims

1. A safety injection device for doses of biological agents, comprising a gun body (15), characterized in that: an opening cavity (17) with an outward opening is formed in the gun body (15), an injection shell (13) is arranged in the opening cavity (17) in a sliding mode, and an injection needle (12) is fixedly arranged on one end side, extending out of the opening cavity (17), of the injection shell (13) towards the outward opening side;

a medicament storage cavity (14) is formed in the injection shell (13), the medicament storage cavity (14) is communicated with the injection needle (12), a sliding disc (11) is arranged on the periphery of the injection needle (12) in a sliding mode, and a pushing block (31) is arranged in the medicament storage cavity (14) in a sliding mode;

the pushing block (31) is close to a connecting spring (32) is fixedly arranged on the end face of one side of the end wall of the open cavity (17), the connecting spring (32) is close to one end of the end wall of the open cavity (17), a pushing plate (33) which is slidably arranged in the medicament storage cavity (14) is fixedly arranged at one end of the end wall of the open cavity (17), and a sliding block (52) is fixedly arranged at one side of the end wall of the open cavity (17) of the pushing plate (33).

2. A device for metered dose safety injection of a biological agent as set forth in claim 1 wherein: injection casing (13) are close to set firmly in the terminal surface of opening chamber (17) end wall one side buffering installation piece (18), buffering installation piece (18) are kept away from the installation is equipped with elastomer (19) in the terminal surface of injection casing (13) one side, elastomer (19) and opening chamber (17) end wall interior power are connected.

3. A device for metered dose safety injection of a biological agent as set forth in claim 1 wherein: keep away from opening chamber (17) the medicament stores the end wall internal fixation who holds chamber (14) central line one side and is equipped with pipeline (16), pipeline (16) opening orientation is kept away from medicament and is stored chamber (14) central line one side, medicament stores chamber (14) and is close to pipeline (16) one side be equipped with linking chamber (26) of pipeline (16) intercommunication, it is equipped with opening orientation in chamber (26) end wall and is close to closed chamber (29) of buffer mounting piece (18) one side, closed chamber (29) are kept away from set firmly reset spring (28) on the end wall of buffer mounting piece (18) one side, reset spring (28) are close to buffer mounting piece (18) one end set firmly slidable mounting in closed chamber (29) with link up closed piece (27) between chamber (26), closed piece (27) are close to the terminal surface of buffer mounting piece (18) one side with the end wall butt of opening chamber (17), a through hole (30) communicated between the pipeline (16) and the medicament storage cavity (14) is arranged in the sealing block (27).

4. A device for metered dose safety injection of a biological agent as set forth in claim 1 wherein: chamber (14) are stored to the medicament is close to buffering installation piece (18) one side is equipped with adjustment motor chamber (21), sliding block (52) slidable mounting be in chamber (14) is stored to the medicament with between adjustment motor chamber (21), sliding block (52) are close to be equipped with the opening in the terminal surface of buffering installation piece (18) one side and move towards being close to thread groove (35) of buffering installation piece (18) one side, thread groove (35) internal thread connection is equipped with threaded spindle (22), adjustment motor chamber (21) are close to the terminal surface internal setting of buffering installation piece (18) one side has adjustment motor (20), adjustment motor chamber (21) with adjustment motor (20) power connection.

5. A device for metered dose safety injection of a biological agent as set forth in claim 1 wherein: the injection device is characterized in that a supporting disc (56) which is positioned on one side of the buffer mounting block (18) far away from the gun body (15) is fixedly arranged on the periphery of the injection shell (13), three fixed needles (10) which are arranged in a circumferential array are fixedly arranged on the end surface of one side of the buffer mounting block (18) far away from the supporting disc (56), a connecting cavity (24) with an opening facing away from one side of the buffer mounting block (18) is symmetrically arranged on two sides of the medicament storage cavity (14), a sliding rod (23) is arranged at the opening of the connecting cavity (24) in a sliding manner, one end of the sliding rod (23) far away from the buffer mounting block (18) is fixedly connected with the end surface of the sliding disc (11), a connecting plate (37) is arranged in the connecting cavity (24) in a sliding manner, one end of the sliding rod (23) far away from the sliding disc (11) is fixedly connected with the connecting plate (37), a compression spring (25) is fixedly arranged on, one end of the compression spring (25) far away from the sliding disc (11) is fixedly arranged on the end wall of the connecting cavity (24) far away from one side of the sliding disc (11).

6. A device for metered dose safety injection of a biological agent as set forth in claim 1 wherein: adjustment motor chamber (21) both sides symmetry be equipped with extension chamber (53) that chamber (14) intercommunication is stored to the medicament, it keeps away from to extend chamber (53) adjustment motor chamber (21) central line one side is equipped with the opening and is close to rack chamber (54) of opening chamber (17) end wall one side, rack chamber (54) are kept away from link up spring (38) has set firmly on the end wall of opening chamber (17) end wall one side, link up spring (38) and are close to opening chamber (17) end wall one end set firmly slidable mounting in rack chamber (54) removal rack (39), removal rack (39) are close to opening chamber (17) end wall one end with opening chamber (17) end wall butt, extend chamber (53) with slidable mounting is equipped with slip rack (42) between chamber (14) is stored to the medicament, slip rack (42) are kept away from buffering installation piece (18) one end runs through push plate (33) with push block (31) The sliding rack (42) is connected with the pushing plate (33) in a sliding way.

7. A device for metered dose safety injection of a biological agent as set forth in claim 1 wherein: the sliding rack (42) is meshed with the moving rack (39) through a rotating gear (40), the rotating gear (40) is fixedly mounted on a rotating shaft (41), and the rotating shaft (41) is rotatably mounted in an end wall between the rack cavity (54) and the extension cavity (53).

8. A device for metered dose safety injection of a biological agent as set forth in claim 1 wherein: remove rack (39) and keep away from be equipped with opening draw-in groove (51) outwards in the terminal surface of medicament storage chamber (14) central line one side, draw-in groove (51) are close to medicament storage chamber (14) central line one side has set firmly screens spring (50) on the end wall, screens spring (50) are kept away from medicament storage chamber (14) central line one end has set firmly slidable mounting and has fixture block (49) in draw-in groove (51), fixture block (49) are close to the terminal surface of buffering installation piece (18) one side is the cambered surface, rack chamber (54) are kept away from the intercommunication is equipped with spread groove (48) in the end wall of medicament storage chamber (14) central line one side, fixture block (49) slidable mounting be in spread groove (48) with between draw-in groove (51), slidable mounting is equipped with pressure plate (47) in spread groove (48).

9. A device for metered dose safety injection of a biological agent as set forth in claim 1 wherein: keep away from spread groove (48) medicament store chamber (14) central line one side be equipped with connect removal chamber (45) of chamber (24) intercommunication, pressure plate (47) are kept away from medicament store chamber (14) central line one side the terminal surface on have set firmly link rod (46), link rod (46) slidable mounting in spread groove (48) with remove between the chamber (45), remove chamber (45) with connect chamber (24) intercommunication department slidable mounting and be equipped with connecting block (36), connecting block (36) are kept away from buffering installation block (18) one end with connecting plate (37) fixed connection, connecting block (36) are close to buffering installation block (18) one end has set firmly fixed spring (88), fixed spring (88) are close to buffering installation block (18) one end has set firmly slidable mounting connect chamber (24) with remove linking block (43) between chamber (45), the end of the joint block (43) close to the buffering mounting block (18) is hinged with the end of the joint rod (46) far away from the pressure plate (47) through a hinge rod (44).