Improved connection anti-drop structure for venous indwelling needle

Abstract

The utility model relates to the technical field of venous indwelling needles, in particular to an improved connection anti-falling structure for a venous indwelling needle. Comprising a needle head, a needle holding handle installed at the tail end of the needle head, a protective sleeve arranged at the head end of the needle head in a sleeving mode, a conical connector arranged at the tail end of the needle head, a heparin cap installed at the tail end of the conical connector in a screwed mode and a liquid inlet pipe communicated with the side end of the conical connector and obliquely distributed. The infusion hose is communicated between the needle head and the conical joint; and the flow stopping clip is sleeved outside the infusion hose. According to the venous indwelling needle, a conical joint part on an original venous indwelling needle is scientifically and reasonably improved, and the guide block, the limiting sliding sleeve, the elastic clamping piece, the elastic rubber ring and the guide groove are arranged on the liquid inlet pipe, so that an external infusion turncap screwed into the liquid inlet pipe can be subjected to damping and anti-falling treatment after being screwed; and the problem that the external infusion turncap is opened by mistake due to external force is effectively reduced, so that the safety of using the venous indwelling needle for intravenous infusion is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of intravenous indwelling needles, in particular to an improved connection anti-drop structure for intravenous indwelling needles. Background Art

[0002] The intravenous indwelling needle is composed of a stainless steel core, a soft outer sleeve and a plastic needle seat. During puncture, the outer sleeve and the needle core are inserted into the blood vessel together. After the sleeve is inserted into the blood vessel, the needle core is withdrawn, leaving only the soft outer sleeve in the blood vessel for infusion.

[0003] like Figure 5 As shown, the structure of the intravenous indwelling needle commonly used for intravenous infusion is shown. The external infusion screw cap is screwed onto the liquid inlet tube through a thread, so as to establish a liquid connection between the external infusion pipeline and the intravenous indwelling needle. However, this intravenous indwelling needle has the following shortcomings during use: Since the threaded portion on the liquid inlet tube is relatively small, the external infusion screw cap can generally be tightened and unscrewed by rotating 90°-120°. During actual use, when the patient's limbs move or other external forces act on the external infusion screw cap, the external infusion screw cap may be accidentally rotated on the liquid inlet tube, which may easily lead to leakage or even abnormal problems of the connector falling off, directly affecting the safety of the intravenous indwelling needle.

[0004] In view of this, it is particularly important to design and manufacture an anti-drop structure that can effectively prevent the external infusion screw cap from being accidentally rotated due to external force on the intravenous indwelling needle. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that the external infusion connector of the traditional intravenous indwelling needle is easily opened by mistake after being screwed in, resulting in poor safety of intravenous injection, and to propose an improved connection anti-detachment structure for the intravenous indwelling needle.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An improved connection anti-dropout structure for an intravenous indwelling needle comprises a needle, a needle holding handle installed at the rear end of the needle, a protective sleeve sleeved on the front end of the needle, a conical joint arranged at the rear end of the needle, a heparin cap screwed and installed at the rear end of the conical joint, a liquid inlet tube connected to the side end of the conical joint and distributed obliquely, an infusion hose connected between the needle and the conical joint, and a stop clamp sleeved on the outside of the infusion hose, the outer end of the liquid inlet tube being screwed connected to an external infusion screw cap by threaded screwing, and the outside of the liquid inlet tube is provided with an anti-dropout mechanism for preventing the external infusion screw cap from being accidentally rotated after being screwed in.

[0008] As a further description of the above technical solution:

[0009] The anti-slip mechanism includes a limiting sleeve movably mounted on the outside of the liquid inlet tube, a plurality of elastic clips fixed in an annular array to the outer end of the limiting sleeve and wrapping the external infusion screw cap, a guide portion arranged between the liquid inlet tube and the limiting sleeve, and a spring-pressing portion arranged between the limiting sleeve and the plurality of elastic clips.

[0010] As a further description of the above technical solution:

[0011] The guide portion comprises a guide block which is integrally fixed to the outside of the liquid inlet pipe and penetrates the limiting sliding sleeve, and a guide groove which is arranged on the limiting sliding sleeve and corresponds to the guide block.

[0012] As a further description of the above technical solution:

[0013] The spring-pressing part includes an elastic rubber ring sleeved between the limiting sliding sleeve and the outside of multiple elastic clips, a lower ring groove opened on the outside of the limiting sliding sleeve and used to limit the initial position of the elastic rubber ring, and an upper ring groove opened between the outsides of multiple elastic clips and used to limit the working position of the elastic rubber ring.

[0014] As a further description of the above technical solution:

[0015] The inner side of one end of the plurality of elastic clips close to the limiting sliding sleeve is formed with an inwardly recessed thinning section.

[0016] As a further description of the above technical solution:

[0017] The inner sides of the upper ends of the plurality of elastic clips are each provided with a chamfered section with an inclined surface of 45°.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] In the utility model, the conical joint part on the original intravenous indwelling needle is scientifically and rationally improved, and a guide block, a limiting sliding sleeve, an elastic clip, an elastic rubber ring and a guide groove are arranged on the liquid inlet tube. After the external infusion screw cap is screwed onto the liquid inlet tube, when the limiting sliding sleeve is held and slid toward the external infusion screw cap, the multiple elastic clips can elastically abut against the external infusion screw cap in multiple directions, and then the elastic rubber ring is slid into the lower ring groove of the multiple elastic clips, so that the locking force between the elastic clips and the external infusion screw cap can be further improved. This structure can perform a damping and anti-slip treatment on the external infusion screw cap screwed onto the liquid inlet tube after being tightened, effectively reducing the occurrence of the problem of the external infusion screw cap being accidentally screwed open due to external force, thereby improving the safety of intravenous infusion using the intravenous indwelling needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a working schematic diagram of an improved connection anti-detachment structure for an intravenous indwelling needle proposed by the utility model;

[0021] Figure 2 It is a three-dimensional disassembly schematic diagram of the improved intravenous indwelling needle in the utility model;

[0022] Figure 3 It is a partial cutaway schematic diagram of the connection anti-detachment structure for the intravenous indwelling needle in the utility model;

[0023] Figure 4 for Figure 2 A partial enlarged view of the middle A;

[0024] Figure 5 It is a schematic diagram of the structure of a venous indwelling needle in the prior art.

[0025] Legend:

[0026] 1. Needle; 101. Needle holding handle; 102. Protective cover; 2. Conical joint; 201. Heparin cap; 202. Liquid inlet tube; 203. Guide block; 3. Infusion hose; 4. Stop clamp; 5. External infusion screw cap; 6. Limiting sleeve; 601. Elastic clip; 602. Thinning section; 603. Lower ring groove; 604. Upper ring groove; 605. Chamfered section; 606. Guide groove; 7. Elastic rubber ring. DETAILED DESCRIPTION

[0027] 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 of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-4 The utility model provides a technical solution: an improved anti-dropout structure for intravenous indwelling needle connection, comprising a needle 1, a needle holding handle 101 installed at the tail end 1 of the needle, a protective cover 102 sleeved on the head end of the needle 1, a conical joint 2 arranged at the tail end of the needle 1, a heparin cap 201 screwed and installed at the tail end of the conical joint 2, a liquid inlet tube 202 connected to the side end of the conical joint 2 and obliquely distributed, an infusion hose 3 connected between the needle 1 and the conical joint 2, and a stop clamp 4 sleeved on the outside of the infusion hose 3, the outer end of the liquid inlet tube 202 is screwed with an external infusion screw cap 5 through a thread, and the outside of the liquid inlet tube 202 is provided with an anti-dropout mechanism for preventing the external infusion screw cap 5 from being accidentally rotated after being screwed in.

[0029] Specifically, Figure 1-4As shown, the anti-slip mechanism includes a limiting sleeve 6 movably mounted on the outside of the liquid inlet tube 202, a plurality of elastic clips 601 fixed in an annular array on the outer end of the limiting sleeve 6 and wrapping the external infusion screw cap 5, a guide portion arranged between the liquid inlet tube 202 and the limiting sleeve 6, and a spring-pressing portion arranged between the limiting sleeve 6 and the plurality of elastic clips 601, wherein a corrugated anti-slip groove is formed on one end of the plurality of elastic clips 601 facing the external infusion screw cap 5, so as to enhance the locking force between the elastic clips 601 and the external infusion screw cap 5.

[0030] Among them, the guide part includes a guide block 203 which is integrally fixed on the outside of the liquid inlet tube 202 and passes through the limiting sleeve 6, and a guide groove 606 which is opened on the limiting sleeve 6 and corresponds to the guide block 203. The setting of the guide block 203 and the guide groove 606, on the one hand, improves the stability of the sliding adjustment of the limiting sleeve 6 on the liquid inlet tube 202, and on the other hand, can prevent the limiting sleeve 6 from axially rotating on the liquid inlet tube 202, thereby improving the stability of the limiting sleeve 6 in preventing the external infusion screw cap 5 from being accidentally rotated.

[0031] Among them, the spring-pressing part includes an elastic rubber ring 7 sleeved between the limiting sleeve 6 and the outside of multiple elastic clips 601, a lower ring groove 603 opened on the outside of the limiting sleeve 6 and used to limit the initial position of the elastic rubber ring 7, and an upper ring groove 604 opened between the outside of multiple elastic clips 601 and used to limit the working position of the elastic rubber ring 7. When the elastic rubber ring 7 is in the lower ring groove 603, the elastic rubber ring 7 is in the initial position to prevent the elastic rubber ring 7 from running between the limiting sleeve 6 and the multiple elastic clips 601. When the elastic rubber ring 7 is in the upper ring groove 604, the elastic rubber ring 7 is in the working position. At this time, the elastic rubber ring 7 can generate an inward elastic squeezing force on the multiple elastic clips 601, so that the multiple elastic clips 601 can be more stably abutted against the external infusion screw cap 5.

[0032] Specifically, Figure 3 As shown, a plurality of elastic clips 601 are formed with an inwardly recessed thinning section 602 on the inner side of one end close to the limiting sliding sleeve 6, which can make the plurality of elastic clips 601 more susceptible to elastic deformation, thereby facilitating the elastic snapping of the plurality of elastic clips 601 onto the external infusion screw cap 5.

[0033] The inner sides of the upper ends of the multiple elastic clips 601 are all provided with chamfered sections 605 with a slope of 45°, which can generate a guiding slope on the inner sides of the upper ends of the elastic clips 601 to facilitate the multiple elastic clips 601 to slide and buckle into the outside of the limiting sliding sleeve 6.

[0034] Working principle: when in use, after unscrewing the protective cap originally screwed on the liquid inlet tube 202, the external infusion screw cap 5 can be screwed into the liquid inlet tube 202 through the thread, and then the operator can hold and slide the limiting sliding sleeve 6 on the liquid inlet tube 202 toward the external infusion screw cap 5. When the limiting sliding sleeve 6 abuts against the external infusion screw cap 5, the multiple elastic clips 601 on the limiting sliding sleeve 6 also elastically abut against the outside of the external infusion screw cap 5. Finally, the operator slides the elastic rubber ring 7 originally in the lower ring groove 603 upward into the upper ring groove 604 of the multiple elastic clips 601. The elastic rubber ring 7 will apply an inward elastic force to the multiple elastic clips 601, so that the multiple elastic clips 601 are locked more tightly with the external infusion screw cap 5, preventing the external connection from acting on the external infusion screw cap 5, causing leakage due to accidental rotation and the occurrence of interface detachment problems.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An improved connection anti-drop structure for an intravenous indwelling needle, comprising a needle (1), a needle holding handle (101) installed at the tail end of the needle (1), a protective cover (102) sleeved on the head end of the needle (1), a conical joint (2) arranged at the tail end of the needle (1), a heparin cap (201) screwed and installed at the tail end of the conical joint (2), a liquid inlet tube (202) connected to the side end of the conical joint (2) and distributed obliquely, an infusion hose (3) connected between the needle (1) and the conical joint (2), and a stop clamp (4) sleeved on the outside of the infusion hose (3), characterized in that: The outer end of the liquid inlet tube (202) is screwed with an external infusion screw cap (5) via a threaded connection, and an anti-slip mechanism is provided on the outside of the liquid inlet tube (202) for preventing the external infusion screw cap (5) from being accidentally screwed in after being screwed in.

2. The improved connection anti-detachment structure for intravenous indwelling needle according to claim 1, characterized in that: The anti-slip mechanism comprises a limiting sleeve (6) movably mounted on the outside of the liquid inlet tube (202), a plurality of elastic clips (601) fixed in an annular array to the outer end of the limiting sleeve (6) and wrapped around the external infusion screw cap (5), a guide portion arranged between the liquid inlet tube (202) and the limiting sleeve (6), and a spring-pressing portion arranged between the limiting sleeve (6) and the plurality of elastic clips (601).

3. The improved connection anti-detachment structure for intravenous indwelling needle according to claim 2, characterized in that: The guide portion comprises a guide block (203) integrally fixed to the outside of the liquid inlet pipe (202) and penetrating the limiting sliding sleeve (6), and a guide groove (606) provided on the limiting sliding sleeve (6) and corresponding to the guide block (203).

4. The improved connection anti-detachment structure for intravenous indwelling needle according to claim 2, characterized in that: The spring-pressing portion comprises an elastic rubber ring (7) sleeved between the limiting sliding sleeve (6) and the outside of a plurality of elastic clips (601), a lower ring groove (603) opened on the outside of the limiting sliding sleeve (6) and used for limiting the initial position of the elastic rubber ring (7), and an upper ring groove (604) opened between the outsides of the plurality of elastic clips (601) and used for limiting the working position of the elastic rubber ring (7).

5. The improved connection anti-drop structure for intravenous indwelling needle according to claim 2, characterized in that: An inwardly recessed thinned section (602) is formed on the inner side of one end of the plurality of elastic clips (601) close to the limiting sliding sleeve (6).

6. The improved connection anti-detachment structure for intravenous indwelling needle according to claim 2 or 5, characterized in that: The inner sides of the upper ends of the plurality of elastic clips (601) are each provided with a chamfered section (605) with an inclined surface of 45°.

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