A semi-automatic pneumatic ejector pin for remote injection

Abstract

This invention discloses a pneumatic ejector pin for a semi-automatic long-range injection device, comprising an outer cylinder and an inner cylinder slidably mounted therein. The front section of the inner cylinder can protrude from the front end of the outer cylinder under the push of rear gas. A pressure switch is built into the inner cylinder; when the inner cylinder is in the protruding state, the pressure switch can be opened by the rear gas, allowing the rear gas to pass forward through the inner cylinder. By setting the inner cylinder, under the push of the rear gas, the inner cylinder can protrude forward from the outer cylinder, pushing the injection needle located inside the barrel forward and disengaging it from the area directly opposite the magazine. This allows the injection needle inside the barrel to escape the pressure of the injection needle or elastic base plate below. Since the injection needle inside the barrel has already separated from the injection needle or elastic base plate below before being pushed out by the rear gas, no additional friction is generated, thus avoiding the range and circuit effects caused by friction, and thereby improving shooting accuracy.

Description

Technical Field

[0001] This invention relates to the field of injection device technology, and in particular to a pneumatic ejector needle for a semi-automatic remote injection device. Background Technology

[0002] Remote injection devices can fire injection needles to inject drugs into targets and are often used as veterinary tranquilizer guns.

[0003] Most existing long-range injection devices are single-shot, requiring manual reloading of a new injection needle after each shot. This process is not only cumbersome and time-consuming, but also carries the risk of the target escaping when hunting animals. To overcome this difficulty, a long-range injection device with a magazine has evolved. The magazine's opening is connected to an opening in the side wall of the barrel, allowing for the automatic loading of pre-loaded injection needles into the barrel, thus achieving automatic loading and saving preparation time for the next shot.

[0004] The magazine has an opening at the top and a flexible base plate at the bottom of its cavity. When the injection needle is loaded into the magazine cavity, the flexible base plate is pressed downwards. The upward force of the flexible base plate causes the injection needle to disengage from the top opening of the magazine and enter the barrel, thus completing the loading process. Because the injection needles are stacked vertically within the magazine cavity, the uppermost needle is pushed and moved by the needles below it or by the flexible base plate. When the uppermost needle enters the barrel, it does not separate from the needles below it or by the flexible base plate. This means there is a pressure perpendicular to the barrel length, with the same magnitude as the elastic force of the flexible base plate. When the uppermost needle is propelled by gas along the barrel direction, friction occurs between the uppermost needle and the needles below it or by the flexible base plate. This friction affects the range and trajectory of the injection needle, leading to a decrease in shooting accuracy. Therefore, there is a need for a pneumatic ejector pin that can detach the uppermost injection needle from the injection needle below it or the elastic base plate before the injection needle is pushed and moved by gas, thereby reducing the amount of friction. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a pneumatic ejector for a semi-automatic remote injection device.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A pneumatic ejector for a semi-automatic remote injection device includes an outer cylinder and an inner cylinder slidably installed therein. The front section of the inner cylinder can protrude from the front end of the outer cylinder under the push of rear gas. The inner cylinder has a built-in pressure switch. When the inner cylinder is in the protruding state, the pressure switch can be opened by the rear gas, allowing the rear gas to pass forward through the inner cylinder.

[0008] As a further improvement to the above technical solution:

[0009] It also includes an elastic element for pushing the inner cylinder to reset, one end of which is connected to the outer cylinder and the other end is connected to the inner cylinder.

[0010] The elastic element is located inside the outer cylinder and is fitted onto the inner cylinder.

[0011] The elastic element is disposed in the gap between the outer cylinder and the inner cylinder.

[0012] One end of the elastic element is connected to the rear end of the outer cylinder, and the other end is connected to the rear end of the inner cylinder.

[0013] The pressure switch includes a sealing ring connected to the inner cylinder. The sealing ring is blocked by a valve core. Under the push of the gas behind, the valve core can separate from the sealing ring to form a channel for the gas behind to flow forward.

[0014] The front side of the sealing ring is provided with a perforated plate connected to the inner cylinder, and the valve core is located between the sealing ring and the perforated plate; the valve core includes a valve plate for sealing the sealing ring, the valve plate forms a valve stem facing forward, and the valve stem passes through a through hole formed in the perforated plate; an elastic element II for pushing the valve core to reset is installed between the valve plate and the perforated plate.

[0015] The valve core is configured as a plate, with one end elastically hinged to the sealing ring.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] By designing an inner cylinder, the inner cylinder protrudes forward from the outer cylinder under the pressure of the rear gas, pushing the injection needle inside the barrel forward and out of the area directly opposite the magazine. This allows the injection needle inside the barrel to escape the pressure of the injection needle or elastic base plate below. Since the injection needle inside the barrel has already separated from the injection needle or elastic base plate below before being pushed out by the rear gas, no additional friction is generated. This avoids the range and trajectory effects caused by friction, thereby improving shooting accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pneumatic needle used in the semi-automatic remote injection device in Example 1;

[0019] Figure 2 This is a schematic diagram of the application of the pneumatic needle of the semi-automatic remote injection device in Example 1 (Process 1);

[0020] Figure 3 This is a schematic diagram of the application of the pneumatic needle in the semi-automatic remote injection device in Example 1 (Process 2);

[0021] Figure 4This is a schematic diagram of the application of the pneumatic needle for the semi-automatic remote injection device in Example 1 (Process 3);

[0022] Figure 5 This is a schematic diagram of the application of the pneumatic needle for the semi-automatic remote injection device in Example 1 (Process 4);

[0023] Figure 6 This is a schematic diagram of the pneumatic needle used in the semi-automatic remote injection device in Example 2;

[0024] Figure 7 This is a schematic diagram of the pneumatic needle used in the semi-automatic remote injection device in Example 3;

[0025] Figure 8 This is a schematic diagram of the pneumatic needle used in the semi-automatic remote injection device in Example 4.

[0026] The labels in the diagram represent: 1. Outer cylinder; 2. Inner cylinder; 3. Pressure switch; 31. Sealing ring; 32. Valve core; 321. Valve plate; 322. Valve stem; 33. Hollow plate; 331. Through hole; 332. Air hole; 34. Elastic element two; 4. Elastic element one; 5. Barrel; 6. Magazine; 7. Injection needle; 8. Elastic base plate. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] like Figures 1 to 5As shown, the pneumatic ejector pin for the semi-automatic remote injection device in this embodiment includes an outer cylinder 1 and an inner cylinder 2 slidably installed therein. The front section of the inner cylinder 2 can protrude from the front end of the outer cylinder 1 under the push of the rear gas. The inner cylinder 2 has a built-in pressure switch 3. When the inner cylinder 2 is in the protruding state, the pressure switch 3 can be opened by the rear gas, allowing the rear gas to pass forward through the inner cylinder 2. In practical applications, the outer cylinder 1 is fixedly installed inside the barrel 5 and located behind the magazine 6. The injection needle 7 enters the barrel 5 from bottom to top under the push of the elastic base plate 8 built into the magazine 6. The inner cylinder 2, in the retracted state, is located behind the injection needle 7. By setting the inner cylinder 2, under the push of the rear gas, the inner cylinder 2 can protrude forward from the outer cylinder 1 and push the injection needle 7 located in the barrel 5 forward and out of the area directly opposite the magazine 6, thereby allowing the injection needle 7 located in the barrel 5 to get rid of the compression of the injection needle 7 below or the elastic base plate 8. After the inner cylinder 2 is in the convex state, the pressure switch 3 is opened under the continued pushing action of the rear gas. The rear gas passes forward through the pressure switch 3 and exits the inner cylinder 2, pushing the injection needle 7 located in the barrel 5 out. Since the injection needle 7 located in the barrel 5 has already separated from the injection needle 7 below or the elastic base plate 8 before being pushed out by the rear gas, no additional friction is generated. This avoids the range and circuit effects caused by friction, thereby improving shooting accuracy.

[0030] In this embodiment, an elastic element 4 is also included for pushing the inner cylinder 2 to reset. One end of the elastic element 4 is connected to the outer cylinder 1, and the other end is connected to the inner cylinder 2. Specifically, the elastic element 4 is located inside the outer cylinder 1 and is fitted onto the inner cylinder 2. (The form of the elastic element 4 can be varied, for example, in embodiment 2, such as...) Figure 6 As shown, the elastic element 4 is disposed in the gap between the outer cylinder 1 and the inner cylinder 2; for example, in embodiment 3, as... Figure 7 As shown, one end of the elastic element 4 is connected to the rear end of the outer cylinder 1, and the other end is connected to the rear end of the inner cylinder 2. By setting the elastic element 4, after one firing is completed, the inner cylinder 2 will be pushed back to its original position by the elastic element 4 after losing the push of the gas behind it, in preparation for the next firing. In this way, the preparation time for firing can be saved and the operation process can be simplified.

[0031] In this embodiment, the pressure switch 3 includes a sealing ring 31 connected to the inner cylinder 2. The sealing ring 31 is blocked by a valve core 32. Under the push of the gas behind, the valve core 32 can separate from the sealing ring 31, forming a channel for the gas behind to flow forward. Specifically, the front side of the sealing ring 31 is provided with a perforated plate 33 connected to the inner cylinder 2, and the valve core 32 is located between the sealing ring 31 and the perforated plate 33. The valve core 32 includes a valve plate 321 for blocking the sealing ring 31. The valve plate 321 forms a valve stem 322 facing forward, and the valve stem 322 passes through a through hole 331 formed on the perforated plate 33. An elastic element 34 for pushing the valve core 32 to reset is installed between the valve plate 321 and the perforated plate 33. (The valve core 32 can have various forms, for example, in embodiment 4, such as...) Figure 8 As shown, the valve core 32 is plate-shaped, with one end elastically hinged to the sealing ring 31. When the inner cylinder 2 is in a convex state, the gas behind it continuously pushes forward. When this thrust reaches the threshold of the pressure switch 3, the valve core 32 is pushed forward, causing the valve plate 321 to separate from the sealing ring 31, forming a channel for the gas to flow forward. Simultaneously, because the outer diameter of the valve plate 321 is smaller than the inner diameter of the inner cylinder 2, the gas behind it can pass through the gap between the valve plate 321 and the inner cylinder 2, and flow through the through-hole vent 332 formed on the perforated plate 33. Furthermore, by setting a valve stem 322 and installing an elastic element 34 between the valve plate 321 and the perforated plate 33, after one firing cycle, the valve core 32, having lost the push from the gas behind it, will be pushed back to its original position by the elastic element 34, preparing for the next firing cycle. This saves preparation time and simplifies the operation process.

[0032] Next, the application of pneumatic needles in semi-automatic remote drug delivery systems will be explained:

[0033] The semi-automatic long-range injection device includes a barrel 5, which is connected to a magazine 6 through an opening formed in its side wall. The magazine 6 automatically feeds injection needles 7 into the barrel 5. An outer cylinder 1 is fixedly installed inside the barrel 5 and located behind the magazine 6. The injection needles 7 enter the barrel 5 from bottom to top under the push of a spring-loaded base plate 8 built into the magazine 6. The inner cylinder 2, in a retracted state, is located behind the injection needles 7. (e.g.) Figure 2 (As shown)

[0034] During firing, gas is introduced into the rear of the barrel 5. Because the internal passage of the inner cylinder 2 is blocked by the pressure switch 3, the gas pushes the inner cylinder 2 forward. The inner cylinder 2, protruding from the outer cylinder 1, pushes the injection needle 7 inside the barrel 5 away from the area directly opposite the magazine 6, thus freeing the injection needle 7 inside the barrel 5 from the pressure of the injection needle 7 below or the elastic base plate 8. At this time, the injection needle 7, originally located at the top of the magazine 6, partially enters the barrel 5 under the pushing force of the elastic base plate 8, forming a pressure with the inner cylinder 2. (e.g.) Figure 3 (As shown)

[0035] With the inner cylinder 2 protruding, the gas behind it continuously pushes forward. When this thrust reaches the threshold of the pressure switch 3, the valve core 32 is pushed forward, causing the valve plate 321 to separate from the sealing ring 31, forming a channel for the gas behind it to flow forward. Simultaneously, because the outer diameter of the valve plate 321 is smaller than the inner diameter of the inner cylinder 2, the gas behind it can pass through the gap between the valve plate 321 and the inner cylinder 2, and flow through the through-hole vent 332 formed on the perforated plate 33. The gas behind it exiting the inner cylinder 2 pushes the injection needle 7 located inside the barrel 5 forward, causing it to be ejected. (e.g.) Figure 4 (As shown)

[0036] After firing, since the inner cylinder 2 and valve core 32 lose the push of the rear gas, they return to their original positions under the action of elastic element 4 and elastic element 34. At this time, the injection needle 7, which was originally located at the top of the magazine 6, enters the barrel 5 under the push of the elastic base plate 8. (As shown) Figure 5 (As shown)

[0037] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A pneumatic ejector pin for a semi-automatic remote drug injector, characterized by: It includes an outer cylinder (1) and an inner cylinder (2) that is slidably installed therein. The front section of the inner cylinder (2) can protrude from the front end of the outer cylinder (1) under the push of the rear gas. The inner cylinder (2) is equipped with a pressure switch (3). When the inner cylinder (2) is in the protruding state, the pressure switch (3) can be opened by the rear gas, so that the rear gas passes forward through the inner cylinder (2). The pressure switch (3) includes a sealing ring (31) connected to the inner cylinder (2). The sealing ring (31) is blocked by the valve core (32). Under the push of the gas behind, the valve core (32) can separate from the sealing ring (31) to form a channel for the gas behind to flow forward. The front side of the sealing ring (31) is provided with a perforated plate (33) connected to the inner cylinder (2), and the valve core (32) is located between the sealing ring (31) and the perforated plate (33); the valve core (32) includes a valve plate (321) for sealing the sealing ring (31), the valve plate (321) forms a valve stem (322) facing forward, and the valve stem (322) passes through the through hole (331) formed on the perforated plate (33); an elastic element two (34) for pushing the valve core (32) to reset is installed between the valve plate (321) and the perforated plate (33); Driven by the gas behind, the inner cylinder (2) can protrude forward from the outer cylinder (1) and push the injection needle (7) located in the barrel (5) forward and out of the area directly opposite the magazine (6), thereby allowing the injection needle (7) located in the barrel (5) to get rid of the compression of the injection needle (7) below or the elastic base plate (8).

2. The pneumatic ejector pin for a semi-automatic remote injection device according to claim 1, characterized in that: It also includes an elastic element (4) for pushing the inner cylinder (2) to reset, one end of which is connected to the outer cylinder (1) and the other end is connected to the inner cylinder (2).

3. The pneumatic ejector pin for a semi-automatic remote injection device according to claim 2, characterized in that: The elastic element (4) is located inside the outer cylinder (1) and fitted onto the inner cylinder (2).

4. The pneumatic ejector pin for a semi-automatic remote injection device according to claim 2, characterized in that: The elastic element (4) is disposed in the gap between the outer cylinder (1) and the inner cylinder (2).

5. The pneumatic ejector pin for a semi-automatic remote injection device according to claim 2, characterized in that: One end of the elastic element (4) is connected to the rear end of the outer cylinder (1), and the other end is connected to the rear end of the inner cylinder (2).

6. The pneumatic ejector pin for a semi-automatic remote injection device according to claim 1, characterized in that: The valve core (32) is plate-shaped, with one end of it elastically hinged to the sealing ring (31).

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