Quantitative self-locking injector

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a quantitative self-locking injector which comprises a sleeve and a core rod, the core rod is of a cross rib structure composed of four ribs, a plurality of positioning grooves are formed in the four ribs respectively, the positioning grooves of the ribs are aligned one by one in the radial plane of the core rod to form a group, and the positioning grooves of the ribs are matched with the sleeve. The positioning grooves of each rib are distributed at equal intervals in the axial direction of the core rod, the distance between every two adjacent positioning grooves in the axial direction is the unit adjusting amount, a limiting ring is arranged at a sleeve opening of the tail end of the sleeve, and a cross-shaped through hole allowing the core rod to penetrate through is formed in the limiting ring. According to the quantitative self-locking injector, the positioning grooves are formed in the core rod, the limiting ring is arranged on the sleeve, the core rod is rotated to achieve the function that the limiting ring axially limits or does not limit the core rod, the quantitative injection pushing and extraction functions of the injector are achieved, and different doses can be set according to needs through cooperation of the limiting ring and the different positioning grooves in the core rod; the structure is simple and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a quantitative self-locking syringe. Background Art

[0002] Traditional syringes are typically marked with metering scale lines, and when administering a fixed-dose injection or withdrawal, the dosage must be determined based on these lines. This method of metering is inconvenient for caregivers who cannot clearly see or understand the scale, or for operators whose posture makes it difficult to see the scale lines. Furthermore, misreading the scale can lead to over-injection or over-withdrawal, so improvements are needed. Utility Model Content

[0003] Based on the above problems, the purpose of the present invention is to provide a quantitative self-locking syringe so that the dosage can be determined intuitively, quantitative injection or quantitative extraction can be achieved, and it is convenient for people to use.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A quantitative self-locking syringe comprises a sleeve and a core rod. The core rod is a cross-rib structure composed of four ribs. The four ribs are respectively provided with a plurality of positioning grooves. The positioning grooves of each rib are aligned one by one in a radial plane of the core rod and are grouped. The positioning grooves of each rib are arranged at equal intervals along the axial direction of the core rod, and the spacing between two adjacent positioning grooves along the axial direction is a unit adjustment amount. A limit ring is provided at the rear end of the sleeve, and a cross through hole is formed in the limit ring for the core rod to pass through.

[0006] When the four ribs are axially aligned with the cross hole, the core rod can move axially by a distance of N unit adjustment, where N is a natural number;

[0007] When the limiting ring is radially aligned with any set of positioning grooves and the four ribs are axially misaligned with the cross through hole, the axial displacement of the core rod is locked.

[0008] As an optional solution, the limiting ring is formed by combining a left half and a right half, and is interference fit into the sleeve.

[0009] As an optional solution, concave and convex steps are respectively provided on the combined surfaces of the left half and the right half to limit the relative axial movement of the left half and the right half.

[0010] As an optional solution, a mounting groove is provided on the inner wall of the tail end of the sleeve, and the side surface of the left half and the side surface of the right half are respectively provided as concave and convex surfaces that are interference fit with the mounting groove.

[0011] As an optional solution, a gap of 0.1 mm to 0.5 mm is left between the core rod and the cross through hole.

[0012] As an optional solution, the notch of the positioning groove and the rib are smoothly transitionally connected, so that the core rod can move and rotate smoothly relative to the limiting ring.

[0013] The beneficial effects of the present invention are as follows: the quantitative self-locking syringe is provided with a positioning groove on the core rod and a limiting ring on the sleeve, and then the limiting ring is rotated to form an axial limiting or non-limiting function on the core rod, thereby realizing the quantitative injection and extraction functions of the syringe, and different dosages can be set as needed by cooperating with the limiting ring and different positioning grooves on the core rod. The structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a quantitative self-locking syringe provided by an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the cooperation between the limiting ring and the core rod involved in the embodiment of the utility model;

[0016] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0017] Figure 4 It is a disassembled schematic diagram of the limit ring involved in the embodiment of the utility model.

[0018] In the attached figure:

[0019] 1. Sleeve; 11. Mounting groove; 2. Core rod; 21. Rib; 22. Positioning groove; 3. Limiting ring; 31. Cross hole; 32. Left half; 33. Right half; 34. Concave and convex steps; 35. Concave and convex surface. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0021] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0022] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0024] See also Figures 1 to 4 As shown, this preferred embodiment provides a quantitative self-locking syringe, including a sleeve 1 and a core rod 2. The core rod 2 is a cross rib structure composed of four ribs 21. The four ribs 21 are respectively provided with a plurality of positioning grooves 22. The positioning grooves 22 of each rib 21 are aligned one by one in the radial plane of the core rod 2 and grouped. The positioning grooves 22 of each rib 21 are arranged at equal intervals along the axial direction of the core rod 2, and the spacing between two adjacent positioning grooves 22 along the axial direction is a unit adjustment amount V0. A limit ring 3 is provided at the tail end of the sleeve 1, and a cross through hole 31 is opened on the limit ring 3 for the core rod 2 to pass through.

[0025] When the four ribs 21 are axially aligned with the cross through hole 31, the core rod 2 can axially move a distance of N unit adjustment amount V0, where N is a natural number;

[0026] When the limiting ring 3 is radially aligned with any set of positioning grooves 22 and the four ribs 21 are axially misaligned with the cross through hole 31 , the axial displacement of the core rod 2 is locked.

[0027] Therefore, the quantitative self-locking syringe is provided with a positioning groove 22 on the core rod 2, a limiting ring 3 is provided on the sleeve 1, and then the core rod 2 is rotated to realize the function of axial limiting or non-limiting the core rod 2 by the limiting ring 3, thereby realizing the function of quantitative injection and extraction of the syringe, and different dosages can be set as needed by cooperating with the limiting ring 3 and different positioning grooves 22 on the core rod 2. It has a simple structure and is easy to use.

[0028] To facilitate the installation of the limit ring 3, see Figure 4The limiting ring 3 here is formed by combining a left half 32 and a right half 33 and is interference fit into the sleeve 1 .

[0029] Furthermore, concave and convex steps 34 are respectively provided on the combined surfaces of the left half 32 and the right half 33 to limit the relative axial movement of the left half 32 and the right half 33 and ensure the combined effect.

[0030] In particular, a mounting groove 11 is provided on the inner wall of the tail end of the sleeve 1, and the side surfaces of the left half 32 and the right half 33 are respectively provided with concave and convex surfaces 35 that are interference fit with the mounting groove 11 to ensure that the limit ring 3 is reliably installed.

[0031] Preferably, a gap of 0.1 mm to 0.5 mm is left between the core rod 2 and the cross through hole 31 . This gap can meet the requirements of movement and rotation of the core rod 2 and has a certain guiding effect on the core rod 2 .

[0032] In particular, the notch of the positioning groove 22 and the rib 21 are smoothly transitionally connected, so that the core rod 2 can move and rotate smoothly relative to the limiting ring 3, which is convenient for operation.

[0033] Usage process: 1) Inject or extract the dose as needed, determine the core rod 2 to be pushed and pulled to the position of the target group positioning groove 22, and calculate the required unit adjustment amount V0; 2) Rotate the core rod 2 so that the four ribs 21 are axially aligned with the cross hole 31, move the core rod 2 axially a set distance, and align the limit ring 3 radially with the target group positioning groove 22; 3) Rotate the core rod 2 again so that the four ribs 21 are axially misaligned with the cross hole 31. At this time, the axial displacement of the core rod 2 is locked, completing the quantitative extraction or quantitative injection, and putting the syringe into a locked state.

[0034] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A quantitative self-locking syringe comprising a sleeve (1) and a core rod (2), wherein the core rod (2) is a cross-rib structure composed of four ribs (21), characterized in that: A plurality of positioning grooves (22) are respectively provided on the four ribs (21), and the positioning grooves (22) of each rib (21) are aligned one by one in a radial plane of the core rod (2) to form a group. The positioning grooves (22) of each rib (21) are arranged at equal intervals along the axial direction of the core rod (2), and the spacing between two adjacent positioning grooves (22) along the axial direction is a unit adjustment amount. A limiting ring (3) is provided at the tail end of the sleeve (1), and a cross through hole (31) is opened on the limiting ring (3) for the core rod (2) to pass through. When the four ribs (21) are axially aligned with the cross through hole (31), the core rod (2) can axially move a distance of N unit adjustment amounts, where N is a natural number; When the limiting ring (3) is radially aligned with any group of the positioning grooves (22), and the four ribs (21) are axially misaligned with the cross through hole (31), the axial displacement of the core rod (2) is locked.

2. The quantitative self-locking syringe according to claim 1, characterized in that: The limiting ring (3) is formed by combining a left half (32) and a right half (33), and is interference-embedded in the sleeve (1).

3. The quantitative self-locking syringe according to claim 2, characterized in that: Concave and convex steps (34) are respectively provided on the combined surfaces of the left half (32) and the right half (33) to limit the relative axial movement of the left half (32) and the right half (33).

4. The quantitative self-locking syringe according to claim 2, characterized in that: A mounting groove (11) is provided on the inner wall of the tail end of the sleeve (1), and the side surface of the left half (32) and the side surface of the right half (33) are respectively provided as concave-convex surfaces (35) that are interference-fitted with the mounting groove (11).

5. The quantitative self-locking syringe according to claim 1, characterized in that: A gap of 0.1 mm to 0.5 mm is left between the core rod (2) and the cross through hole (31).

6. The quantitative self-locking syringe according to claim 1, characterized in that: The notch of the positioning groove (22) and the rib (21) are smoothly transitionally connected, so that the core rod (2) can move and rotate smoothly relative to the limiting ring (3).

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