Luer cap triple sealing structure applied to pre-filled catheter flusher

Abstract

The Luer cap triple sealing structure comprises a pre-filled catheter flusher body, the pre-filled catheter flusher body comprises a needle cylinder sleeve, a push rod and a silica gel protective cap, the push rod and the silica gel protective cap are arranged in the needle cylinder sleeve in a sliding mode, the silica gel protective cap is fixedly connected with the push rod in a threaded mode, and a connector with internal threads is arranged at the front end of the needle cylinder sleeve. A liquid outlet hole communicated with the needle cylinder sleeve is formed in the center of the connector, a sealing head with external threads is arranged on the Luer cap structure, a sealing column is arranged in the sealing head, the sealing head and the connector are connected through the threads to form a first-stage sealing structure, and the sealing column is embedded in the liquid outlet hole to form a second-stage sealing structure. A first sealing ring in interference fit with the liquid outlet hole is arranged on the inner wall of the sealing head to form a three-stage sealing structure. By means of the triple sealing structure of the Luer cap, it is guaranteed that sterile normal saline in the pre-filling type catheter flusher cannot seep out from side gaps, especially cap rotation caused by vibration and falling in the transportation process, and the sealing performance and the connecting strength are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical appliances, in particular to a triple sealing structure of a Luer cap applied to a prefilled catheter flusher. Background Art

[0002] Prefilled syringes are a new type of drug packaging material. They store liquid drugs directly in syringes. They are equivalent to ordinary drug packaging containers when storing drugs, and are equivalent to ordinary syringes when using them. They are simple and convenient to use. The syringe assembly generally includes a jacket, a piston, a push rod, and a needle. The piston is installed in front of the push rod and can be driven by the push rod to move back and forth in the jacket. The needle is installed and connected to the front end of the jacket, and a silicone protective cap is installed on it.

[0003] If the current prefilled syringes are to be made into products with Luer lock connectors, an adapter with internal threads must be installed at the syringe head. The internal threads of the adapter cooperate with the Luer connector. However, during clinical transportation, existing products may have problems such as Luer cap retreat, leakage, and destruction of the sterility of saline, which affect product use. Utility Model Content

[0004] In view of the above technical problems to be solved, a triple sealing structure of a Luer cap applied to a prefilled catheter flusher is provided.

[0005] To achieve the above-mentioned purpose, the utility model discloses a triple sealing structure of a Luer cap applied to a prefilled catheter flusher, comprising a prefilled catheter flusher body and a Luer cap structure installed at the front end of the prefilled catheter flusher body, the prefilled catheter flusher body comprising a syringe sleeve and a push rod and a silicone protective cap slidably arranged in the syringe sleeve, the silicone protective cap is threadedly fixedly connected to the push rod, a connector with an internal thread is arranged at the front end of the syringe sleeve, a liquid outlet communicated with the syringe sleeve is arranged at the center of the connector, a sealing head with an external thread is arranged on the Luer cap structure, a sealing column is arranged in the sealing head, the sealing head and the connector are threadedly connected to form a primary sealing structure, the sealing column is embedded in the liquid outlet to form a secondary sealing structure, and a first sealing ring with an interference fit with the liquid outlet is arranged on the inner wall of the sealing head to form a tertiary sealing structure.

[0006] Furthermore, an inner Luer hole for accommodating the liquid outlet hole is formed between the sealing head and the sealing column, and the outer wall of the inner Luer hole is a conical structure and matches the outer contour of the liquid outlet hole.

[0007] Furthermore, a buffer hole is provided on the end surface of the sealing column close to the connection position.

[0008] Furthermore, the buffer hole is a conical hole structure.

[0009] Furthermore, the buffer hole is a symmetrically arranged double hole structure, and the double hole structure is a curved waist-shaped groove structure.

[0010] Furthermore, the buffer hole is a concentric circular groove structure.

[0011] Furthermore, a second sealing ring is provided on the outer wall of the sealing column and is interference fit with the inner wall of the liquid outlet hole.

[0012] Furthermore, the cross-sectional shape of the second sealing ring is semicircular or trapezoidal.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model discloses a triple sealing structure of a Luer cap applied to a prefilled catheter flusher. The triple sealing structure of the Luer cap ensures that the sterile saline inside the prefilled catheter flusher will not leak out from the side gap, especially the rotation of the cap caused by vibration or falling during transportation, thereby improving the sealing performance and connection strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0015] Figure 1 It is an explosion diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the connector of the syringe sleeve of the utility model.

[0017] Figure 3 It is a schematic diagram of the Luer cap connection structure of the utility model.

[0018] Figure 4 It is a schematic diagram of the first embodiment of the present utility model.

[0019] Figure 5 It is a schematic diagram of the second embodiment of the present utility model.

[0020] Figure 6 This is a schematic diagram of the third embodiment of the present invention.

[0021] Figure 7 This is the internal structure diagram of the third embodiment of the present utility model.

[0022] In the figure: 1 is a Luer cap structure; 11 is a sealing head; 12 is a sealing column; 13 is a buffer hole; 14 is a first sealing ring; 15 is a second sealing ring; 2 is a syringe sleeve; 21 is a connecting head; 22 is a liquid outlet; 3 is a silicone sheath; and 4 is a push rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0024] Embodiment 1 of the present utility model, as Figures 1 to 4 As shown, the prefilled catheter flusher body includes a syringe sleeve 2, a push rod 4 and a silicone protective cap 3 slidably arranged in the syringe sleeve 2, the silicone protective cap 3 is threadedly fixedly connected to the push rod 4, the front end of the syringe sleeve 2 is provided with a connector 21 with an internal thread, the center of the connector 21 is provided with a liquid outlet 22 communicated with the syringe sleeve 2, a sealing head 11 with an external thread is provided on the Luer cap structure 1, a sealing column 12 is provided in the sealing head 11, the sealing head 11 and the connector 21 are threadedly connected to form a primary sealing structure, the sealing column 12 is embedded in the liquid outlet 22 to form a secondary sealing structure, and a first sealing ring 14 interference fit with the liquid outlet 22 is provided on the inner wall of the sealing head 11 to form a tertiary sealing structure, so as to solve the problems of Luer cap retreat, liquid seepage, and damage to the sterility of saline during transportation of clinical prefilled catheter flushers, and improve the sealing performance and connection strength.

[0025] An inner Luer hole for accommodating the liquid outlet hole 22 is formed between the sealing head 11 and the sealing column 12. The outer wall of the inner Luer hole is a conical structure and matches the outer contour of the liquid outlet hole 22, so that the liquid outlet hole 22 can be smoothly inserted into the inner Luer hole.

[0026] A buffer hole 13 is provided on the end surface of the sealing column 12 near the connection position. Specifically, in this embodiment, the buffer hole 13 is a conical hole structure to prevent the sealing column 12 from being too hard during the insertion process and affecting the assembly.

[0027] A second sealing ring 15 is provided on the outer wall of the sealing column 12, which is interference fit with the inner wall of the liquid outlet hole 22. The first sealing ring 14 and the second sealing ring 15 are used to alleviate extrusion deformation, facilitate insertion into the inner Luer hole, and liquid is not easy to leak out. Specifically, the cross-sectional shape of the second sealing ring 15 is a trapezoid. Compared with the semicircular structure, the trapezoidal sealing area is larger and the structural deformation is large. The first sealing ring 14 and the second sealing ring 15 cooperate with each other and act on the inner and outer surfaces of the liquid outlet hole 22, which can not only ensure the sealing effect, but also ensure a certain degree of yielding deformation to prevent excessive extrusion and excessive unscrewing force.

[0028] Embodiment 2 of the present utility model, as Figure 5 As shown, the difference from the first embodiment is that the buffer hole 13 is a symmetrically arranged double-hole structure, and the double-hole structure is a curved waist-shaped groove structure, which alleviates extrusion deformation and ensures the sealing effect.

[0029] Embodiment 3 of the present utility model, as Figure 6 As shown, the difference from the first embodiment is that the buffer hole 13 is a concentric ring groove structure, which alleviates the extrusion deformation and ensures the sealing effect. Specifically, Figure 7 As shown, the annular groove structure is an inner conical hole plus an outer ring. The outer ring relieves extrusion deformation, facilitates insertion into the inner Luer hole, and liquid is not easy to leak out. The outer wall of the sealing column 12 is provided with a second sealing ring 15 that is interference fit with the inner wall of the liquid outlet hole 22, which can not only ensure the sealing effect, but also ensure a certain degree of deformation to prevent excessive extrusion and excessive unscrewing force.

[0030] Working principle: The sealing head and the connecting head are connected by threads to form a primary sealing structure, the sealing column is embedded in the liquid outlet to form a secondary sealing structure, and a first sealing ring with an interference fit with the liquid outlet is provided on the inner wall of the sealing head to form a tertiary sealing structure. The first sealing ring and the second sealing ring cooperate with each other and act on the inner and outer surfaces of the liquid outlet, which can not only ensure the sealing effect, but also ensure a certain degree of deformation to prevent excessive extrusion. The buffer hole opened on the sealing column can alleviate the extrusion deformation and ensure the sealing effect at the same time.

[0031] Several points that need to be explained are: First, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, and can be mechanical or electrical connections, or internal connectivity between two elements, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change; secondly, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities.

[0032] The above examples are merely illustrative of the present utility model and do not constitute a limitation on the protection scope of the present utility model. All designs that are identical or similar to the present utility model fall within the protection scope of the present utility model.

Claims

1. A Luer cap triple seal structure for a prefilled catheter flusher, comprising a prefilled catheter flusher body and a Luer cap structure (1) mounted at the front end of the prefilled catheter flusher body, wherein the prefilled catheter flusher body comprises a syringe sleeve (2) and a push rod (4) and a silicone protective cap (3) slidably disposed in the syringe sleeve (2), wherein the silicone protective cap (3) is threadedly fixedly connected to the push rod (4), and the front end of the syringe sleeve (2) is provided with a connector (21) with an internal thread, characterized in that: The center of the connector (21) is provided with a liquid outlet hole (22) which is in communication with the syringe sleeve (2); a sealing head (11) with an external thread is provided on the Luer cap structure (1); a sealing column (12) is provided in the sealing head (11); the sealing head (11) and the connector (21) are connected by threads to form a primary sealing structure; the sealing column (12) is embedded in the liquid outlet hole (22) to form a secondary sealing structure; and a first sealing ring (14) which is interference-fitted with the liquid outlet hole (22) is provided on the inner wall of the sealing head (11) to form a tertiary sealing structure.

2. The triple seal structure of the Luer cap used for the prefilled catheter flusher according to claim 1, characterized in that: An inner Luer hole for accommodating the liquid outlet hole (22) is formed between the sealing head (11) and the sealing column (12); the outer wall of the inner Luer hole is a conical structure and matches the outer contour of the liquid outlet hole (22).

3. The triple seal structure of the Luer cap used for the prefilled catheter flusher according to claim 2, characterized in that: A buffer hole (13) is provided on the end surface of the sealing column (12) close to the connection position.

4. The triple seal structure of the Luer cap used for the prefilled catheter flusher according to claim 3, characterized in that: The buffer hole (13) is a conical hole structure.

5. The triple seal structure of the Luer cap used for the prefilled catheter flusher according to claim 3, characterized in that: The buffer hole (13) is a symmetrically arranged double hole structure, and the double hole structure is a curved waist-shaped groove structure.

6. The triple seal structure of the Luer cap used for the prefilled catheter flusher according to claim 3, characterized in that: The buffer hole (13) is a concentric circular groove structure.

7. The triple seal structure of the Luer cap used for the prefilled catheter flusher according to claim 3, characterized in that: A second sealing ring (15) is provided on the outer wall of the sealing column (12) and is interference fit with the inner wall of the liquid outlet hole (22).

8. The triple seal structure of the Luer cap used for the prefilled catheter flusher according to claim 7, characterized in that: The cross-sectional shape of the second sealing ring (15) is semicircular or trapezoidal.

Images