An adjustable length core rod and a pre-filled syringe using the same

Abstract

The utility model relates to medical instrument technical field, concretely is a kind of adjustable length core rod and use its core rod pre-filled flush pipe syringe, it includes: the locking cap of sealed connection, needle cylinder outer cover, piston;Locking cap seal cover is located at the left end of needle cylinder outer cover, and piston seal container is located in needle cylinder outer cover;Needle cylinder outer cover is movably provided with core rod assembly, and core rod assembly is composed of child core rod, female core rod, and the length of adjustment is realized.The utility model relates to a kind of adjustable length core rod and use its core rod pre-filled flush pipe syringe, telescopic design, it is convenient to package, transport under the state of shortening, also under the state of elongation, ensure use effect.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an adjustable length core rod and a pre-filled syringe using the core rod. Background Technology

[0002] Pre-filled flushing syringes are disposable medical devices pre-filled with sterile flushing solution. They are primarily used for flushing catheters, indwelling needles, and other instruments during medical procedures to maintain tubing patency and prevent thrombosis or drug residue. Due to their simplified operation, prevention of needlestick injuries, and low risk of cross-infection, pre-filled flushing syringes are widely used in clinical flushing and sealing procedures in the medical field.

[0003] Currently, the method of using pre-filled flushing syringes is as follows: first, a certain volume of flushing fluid, such as physiological saline or heparin sodium solution, is filled in; then, the entire flushing fluid is injected through the plunger. Therefore, pre-filled flushing syringes are long overall, making packaging difficult and increasing the risk of breakage during transportation, posing significant challenges to production, transportation, and clinical use. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides an adjustable length core rod and a pre-filled syringe using the core rod. The telescopic design facilitates packaging and transportation in the shortened state, and ensures the effectiveness of use in the extended state.

[0005] The technical solution adopted by this utility model is:

[0006] An adjustable length core rod includes a core rod assembly, which consists of a sub-core rod and a female core rod to achieve length adjustment.

[0007] The sub-core rod includes: a rod body, a locking ring and a threaded rod arranged sequentially on the left end face of the rod body, and an anti-detachment rib protruding from the right outer wall of the rod body.

[0008] The female core rod includes: a cylinder that is slidably sleeved outside the rod body, a push cap that protrudes from the right end of the cylinder, and an annular groove that engages with the anti-detachment rib on the inside of the left side of the cylinder.

[0009] Furthermore, a concave cavity is provided on the right end face of the threaded rod.

[0010] Furthermore, the rod body is configured with a cross-section in the shape of a cross, and a hollow part is provided in the center of the right side of the rod body.

[0011] A pre-filled punch syringe using an adjustable-length plunger includes: a sealingly connected locking cap, a syringe jacket, and a piston;

[0012] The locking cap is located at the left end of the syringe jacket;

[0013] The piston is sealed and housed inside the syringe jacket, and is housed in a concave cavity and screwed to the threaded rod.

[0014] Furthermore, the cylindrical body is slidably inserted into the syringe jacket.

[0015] Furthermore, a retaining ring is provided radially protruding from the inner wall edge of the right end of the syringe jacket. The retaining ring is interference-fitted with the locking ring to prevent the core rod assembly from being pulled out of the syringe jacket.

[0016] Furthermore, the anti-detachment rib is configured with a semi-rhomboid cross-section.

[0017] Furthermore, the hollow portion of the cylinder is configured with a cross-section in the shape of a cross to accommodate the cross-shaped rod.

[0018] Furthermore, the annular groove is arranged radially on the inner wall of the hollow part of the cross-shaped section of the cylinder.

[0019] The advantages of this utility model, which discloses an adjustable length core rod and a pre-filled syringe using the same core rod, are as follows:

[0020] 1. The front core rod assembly is retracted, which shortens the overall length of the pre-filled syringe, reducing its space requirements and making it easier to package, transport, and store.

[0021] 2. In actual use, pull the female core rod and engage the female core rod to extend the pre-filled flushing syringe to the appropriate operating length for easy flushing operation. Attached Figure Description

[0022] Figure 1 This is a front sectional view of a pre-filled flushing syringe according to an example of this utility model;

[0023] Figure 2 This is a front view schematic diagram of the sub-core rod of this utility model embodiment;

[0024] Figure 3 This is a front view sectional view of the sub-core rod of this utility model embodiment;

[0025] Figure 4 This is a left-side view of the core rod in an example of this utility model;

[0026] Figure 5 This is a right-side view of the sub-core rod in an example of this utility model;

[0027] Figure 6 This is a three-dimensional schematic diagram of the core rod of this utility model;

[0028] Figure 7 This is a front view sectional view of the female core rod in an example of this utility model.

[0029] In the picture:

[0030] 1. Locking cap, 2. Syringe jacket, 3. Piston, 4. Core rod assembly

[0031] 41. Sub-core rod; 410. Rod body; 411. Threaded rod; 412. Locking ring; 413. Anti-detachment rib; 414. Hollow part; 415. Cavity.

[0032] 42. Female core rod; 420. Cylinder body; 421. Push cover; 422. Annular groove. Detailed Implementation

[0033] To more clearly and explicitly illustrate the specific implementation objectives and methods of this utility model, the technical solution of this utility model will be fully described below. The described embodiments are only some embodiments of this utility model, not all embodiments. Without creative effort, all other embodiments based on the described embodiments of this utility model are within the protection scope of this utility model.

[0034] This utility model discloses an adjustable length core rod and a pre-filled syringe using the core rod, such as... Figure 1 As shown, it includes:

[0035] The locking cap 1, syringe jacket 2, and piston 3 are sealed together. A retaining ring is provided radially protruding from the inner wall edge of the right end of the syringe jacket 2. The locking cap 1 is sealed and covered on the left end of the syringe jacket 2. The piston 3 is sealed and housed inside the syringe jacket 2.

[0036] The syringe outer sleeve 2 is movably provided with a core rod assembly 4, which consists of a sub-core rod 41 and a female core rod 42, and realizes the length adjustment.

[0037] The sub-core rod 41, as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, it includes:

[0038] A rod 410 with a cross-section shaped like a cross is provided. A locking ring 412 and a threaded rod 411 are sequentially provided on the left end face of the rod 410. The locking ring 412 is interference-fitted with a retaining ring to prevent the core rod assembly 4 from being pulled out of the syringe sleeve 2. A hollow part 414 is provided in the center of the right part of the rod 410. An anti-detachment rib 413 is provided on the right outer wall of the rod 410. The anti-detachment rib 413 is set with a semi-rhomboid cross-section. A concave cavity 415 is provided on the right end face of the threaded rod 411. The cavity 415 is used to accommodate the right part of the piston 3 and is screwed to the threaded rod 411.

[0039] The female core rod 42, as Figure 7 As shown, it includes:

[0040] A cylindrical body 420 is slidably sleeved outside the rod body 410. The cylindrical body 420 is slidably inserted into the syringe outer sleeve 2. A push cap 421 is provided on the right end of the cylindrical body 420. An annular groove 422 is provided on the left side of the cylindrical body 420 to engage with the anti-detachment rib 413.

[0041] In order to improve the overall strength of the core rod 42, the hollow part of the cylinder 420 is set with a cross-section in the shape of a cross to accommodate the rod 410 with the cross-section. The annular groove 422 is arranged radially on the inner wall of the hollow part of the cross-section along the cylinder 420.

[0042] Based on the specific structure of the adjustable length core rod and the pre-filled syringe using the core rod in the above embodiments, the extension method of the core rod assembly 4 will be further explained below:

[0043] Remove the pre-filled flushing syringe from the protective packaging bag.

[0044] The locking cap 1 and syringe jacket 2 are sealed together. The piston 3 is sealed and housed in the leftmost part of the syringe jacket 2. When the push cap 421 is pulled to the right, a vacuum is formed inside the syringe jacket 2, and the core rod 41 cannot move.

[0045] The cylinder 420 between the syringe jacket 2 and the rod 410 is pulled out to the right. The inner wall of the cylinder 420 pushes the anti-detachment rib 413, causing the rod 410 where the anti-detachment rib 413 is located to invade the hollow part 414 until the anti-detachment rib 413 is stuck in the annular groove 422.

[0046] At this point, the rod 410 and the cylinder 420 are connected as a whole, that is: the sub-core rod 41 and the mother core rod 42 are connected as a whole.

[0047] In summary, the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification. All equivalent variations and modifications of the shape, structure, features, and spirit described in the claims of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An adjustable length core rod, characterized in that: include: The core rod assembly (4) consists of a sub-core rod (41) and a female core rod (42) to achieve length adjustment; The sub-core rod (41) includes: The rod body (410) has a locking ring (412) and a threaded rod (411) arranged sequentially on the left end face of the rod body (410), and an anti-detachment rib (413) protruding on the right outer wall of the rod body (410). The female core rod (42) includes: A cylinder (420) is slidably sleeved outside the rod (410). A push cover (421) is provided on the right end of the cylinder (420), and an annular groove (422) is provided on the left side of the cylinder (420) to engage with the anti-detachment rib (413).

2. The adjustable length core rod according to claim 1, characterized in that: The right end face of the threaded rod (411) is provided with an inwardly recessed cavity (415).

3. The adjustable length core rod according to claim 2, characterized in that: The rod (410) is configured with a cross-section in the shape of a cross, and a hollow part (414) is provided in the center of the right side of the rod (410).

4. A pre-filled punching syringe using an adjustable-length core rod, wherein the adjustable-length core rod according to claim 3 is characterized in that: include: Sealed connection locking cap (1), syringe jacket (2), piston (3); The locking cap (1) is sealed on the left end of the syringe jacket (2); The piston (3) is sealed and housed inside the syringe jacket (2), and is housed in the cavity (415) and screwed to the threaded rod (411).

5. A pre-filled punching syringe using an adjustable length core rod according to claim 4, characterized in that: The cylinder (420) is slidably inserted into the syringe jacket (2).

6. A pre-filled punching syringe using an adjustable length core rod according to claim 4, characterized in that: A retaining ring is provided radially protruding from the inner wall edge of the right end of the syringe jacket (2). The retaining ring is interference-fitted with the locking ring (412) to prevent the core rod assembly (4) from being pulled out of the syringe jacket (2).

7. A pre-filled punching syringe using an adjustable length core rod according to claim 4, characterized in that: The anti-detachment rib (413) is configured with a semi-rhomboid cross-section.

8. A pre-filled punching syringe using an adjustable length core rod according to claim 4, characterized in that: The hollow part of the cylinder (420) is configured with a cross-section in the shape of a cross to accommodate the cross-shaped rod (410).

9. A pre-filled punching syringe using an adjustable length core rod according to claim 8, characterized in that: The annular groove (422) is arranged radially along the inner wall of the hollow part of the cross-section of the cylinder (420).

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