Disposable needle-proof intravenous catheter

Abstract

The present invention discloses a disposable anti-needle-stick type intravenous indwelling needle, comprising a sleeve, an inner groove is provided on the inner side of the sleeve, a fastening plug is clamped at the bottom of the sleeve, an isolation plug is fixedly installed at the bottom of the fastening plug, a steel needle that penetrates the fastening plug and the isolation plug is slidably inserted into the inner side of the inner groove, and the top of the steel needle extends to the top of the sleeve and is fixedly installed with a fixed needle seat that fits the top surface of the sleeve. The disposable anti-needle-stick type intravenous indwelling needle, by continuing to push the sleeve and the steel under the support of the support plate, sends the catheter into the blood vessel of the infusion recipient, and the support plate can play an effective auxiliary support effect, effectively alleviate the slight tremor of medical staff during the advancement, greatly improve the stability of the steel needle during the advancement process, effectively reduce the damage caused by the steel needle to the infusion recipient, and make the intravenous indwelling needle smooth.

Description

Technical Field

[0001] The invention relates to the technical field of intravenous indwelling needles, in particular to a disposable needle-stab-proof intravenous indwelling needle. 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 After the sleeve is inserted into the blood vessel, the needle core is withdrawn, and only the soft outer sleeve is left in the blood vessel for infusion. It is suitable for intermittent, continuous or daily intravenous infusion treatment. Before use, different models and sizes of indwelling needles can be selected according to the actual situation of the infusionist.

[0003] The use of intravenous indwelling needles can avoid multiple needle sticks and infusions for the infusion recipient, thus alleviating the pain of the infusion recipient. The patent with the authorization announcement number CN206434660U discloses a disposable anti-needlestick type intravenous indwelling needle, including: an anti-needlestick device, one end of which is arranged in the catheter assembly, which includes: a cylinder, the interior of which has a cavity along the axial direction, and two through holes are respectively opened at the two ends of the cavity along the axial direction. The indwelling needle can safely and effectively shield the needle tip part contaminated by the patient's blood after the needle tube is pulled out, so as to prevent the contaminated needle tip from stabbing relevant personnel. However, although the elastic swing plate in the patent can effectively block the needle tip, the blood remaining in the puncture needle cannot be completely blocked by the elastic swing plate. After the puncture needle is withdrawn, part of the blood remaining in the needle will gradually flow out and easily drip out, causing pollution, so there are certain safety hazards. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a disposable needle-stick-proof intravenous indwelling needle to solve the existing problems.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a disposable needle-stick-proof intravenous indwelling needle comprises a sleeve, an inner groove is provided on the inner side of the sleeve, a fastening plug is clamped at the bottom of the sleeve, an isolation plug is fixedly installed at the bottom of the fastening plug, a steel needle penetrating the fastening plug and the isolation plug is slidably inserted into the inner side of the inner groove, the top of the steel needle extends to the top of the sleeve and is fixedly installed with a fixed needle seat that fits the top surface of the sleeve, the bottom end of the steel needle extends to the bottom of the isolation plug, a connecting pipe is fixedly installed at the bottom of the isolation plug, a catheter is fixedly installed at the bottom of the connecting pipe, sealing grooves symmetrically distributed on both sides of the steel needle are provided on the inner side of the inner groove, a sealing block that fits closely to the surface of the steel needle is slidably connected to the inner side of the sealing groove, mutually fitting offset notches are provided on opposite sides of the two sealing blocks, and a return spring in a compressed state is fixedly installed between the sealing block and the sealing groove.

[0006] As a preferred technical solution of the present invention, the connecting tube and the catheter are connected to each other and are both sleeved on the outside of the steel needle, and a needle holding handle is fixedly installed on the top of the fixed needle seat.

[0007] As a preferred technical solution of the present invention, one end of a branch pipe is installed on the side of the connecting pipe, the other end of the branch pipe is connected to one end of an extension hose, a single-handed clamp is provided on the outside of the extension hose, and the other end of the extension hose is connected to a positive pressure connector.

[0008] As a preferred technical solution of the present invention, a marking line is provided on the outside of the catheter at a position 2-3 mm away from the bottom of the connecting tube. The bottom end of the catheter is conical in design and evenly distributed flow holes are provided on the surface close to the conical end.

[0009] As a preferred technical solution of the present invention, a protective sleeve is sleeved on the outer side of the catheter. The protective sleeve is U-shaped and sleeves the bottom tip of the steel needle therein. The top of the protective sleeve fits with the bottom of the connecting tube.

[0010] As a preferred technical solution of the present invention, an eccentrically arranged protrusion is symmetrically installed on the bottom of the sleeve, and a groove corresponding to the position and size of the protrusion is opened on the top of the fastening plug, and the protrusion is made of soft plastic material.

[0011] As a preferred technical solution of the present invention, a balancing groove is opened on the inner side of the inner groove, and the fixed needle seat is slidably connected to the inner side of the balancing groove.

[0012] As a preferred technical solution of the present invention, a support plate is provided on the outside of the sleeve, and symmetrically distributed baffles are provided on the outside of the support plate. The sleeve slides between the two baffles, and a symmetrically distributed elastic sheet is fixedly installed on the side of the support plate away from the baffle.

[0013] As a preferred technical solution of the present invention, expansion grooves symmetrically distributed on both sides of the steel needle are opened on the inner side of the inner groove and between the sealing groove and the balancing groove.

[0014] Compared with the prior art, the present invention provides a disposable needle-stick-proof intravenous indwelling needle, which has the following beneficial effects:

[0015] 1. The disposable needle-stick-proof intravenous indwelling needle fixes the connecting tube on the arm of the infusion recipient and completes the infusion connection through the positive pressure connector. After the detachment, the tip of the steel needle is located in the expansion slot in the cannula, and due to the barrier of the sealing block, the residual blood in the steel needle will not seep out of the cannula, thereby improving the safety of the intravenous indwelling needle during and after use, avoiding the dripping of residual blood, and reducing the subsequent contamination risk of the cannula. The staggered notches on the opposite side of the sealing block make the staggered notches fit together under the action of the reset spring after the steel needle is withdrawn, and due to the setting of the staggered notches, the gap between the sealing blocks that are engaged with each other is not a straight line, but will increase multiple layers of barrier, further strengthening the sealing of the expansion slot.

[0016] 2. The disposable needle-stick-proof intravenous catheter has a conical design, which makes it smoother to follow the steel needle into the skin and blood vessels of the infusion recipient. At the same time, the soft catheter material will not affect its safety inside the blood vessel due to the conical design at its port. At the same time, the design of the flow hole can increase the flow rate of the liquid at the catheter port during infusion, and also increase the blood return rate during needle puncture, making the blood return more obvious, making it easier for medical staff to identify the accuracy of the catheter entering the blood vessel, and improving the accuracy and convenience of the intravenous catheter operation. On the other hand, it will also reduce the toughness of the catheter port, so that after entering the blood vessel, the damage to the blood vessel is reduced, the discomfort of the blood vessel is reduced, the strange feeling of the subsequent infusion recipient is reduced, and the risk of infection is reduced.

[0017] 3. The disposable anti-needlestick intravenous catheter, by continuing to push the sheath and steel under the support of the support plate, sends the catheter into the blood vessel of the infusion recipient. The support plate can play an effective auxiliary support effect, effectively alleviate the slight tremor of medical staff during the advancement, greatly improve the stability of the steel needle during the advancement process, effectively reduce the damage caused by the steel needle to the infusion recipient, and make the intravenous catheterization smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure near the baffle of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the casing of the present invention;

[0021] Figure 4 For the present invention Figure 1 A schematic diagram of the structure enlargement in the middle;

[0022] Figure 5 For the present invention Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0023] Figure 6 For the present invention Figure 3 A magnified schematic diagram of the structure at C in the middle;

[0024] Figure 7 This is a bottom view of the casing bottom structure distribution of the present invention.

[0025] In the figure: 1. sleeve; 2. isolation plug; 3. fastening plug; 4. connecting pipe; 5. protective sleeve; 6. catheter; 7. steel needle; 8. branch pipe; 9. extension hose; 10. one-hand clamp; 11. positive pressure connector; 12. flow hole; 13. support plate; 14. baffle; 15. offset notch; 16. elastic sheet; 17. fixed needle seat; 18. needle holding handle; 19. marking line; 20. protrusion; 21. groove; 22. inner groove; 23. balance groove; 24. expansion groove; 25. sealing groove; 26. sealing block; 27. reset spring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1

[0028] See also Figure 1-7In this embodiment: a disposable needle-stick-proof intravenous indwelling needle comprises a sleeve 1, an inner groove 22 is provided on the inner side of the sleeve 1, a fastening plug 3 is provided at the bottom of the sleeve 1, an isolation plug 2 is fixedly installed at the bottom of the fastening plug 3, a steel needle 7 penetrating the fastening plug 3 and the isolation plug 2 is slidably inserted into the inner side of the inner groove 22, the top of the steel needle 7 extends to the top of the sleeve 1 and is fixedly installed with a fixed needle seat 17 that fits the top surface of the sleeve 1, the bottom end of the steel needle 7 extends to the bottom of the isolation plug 2, and the isolation plug The bottom of the inner groove 22 is fixedly installed with a connecting pipe 4, and the bottom of the connecting pipe 4 is fixedly installed with a catheter 6. The inner side of the inner groove 22 is provided with sealing grooves 25 symmetrically distributed on both sides of the steel needle 7. The inner side of the sealing groove 25 is slidably connected with a sealing block 26 that is close to the surface of the steel needle 7. The two sealing blocks 26 are provided with mutually fitting offset notches 15 on the opposite sides. A return spring 27 in a compressed state is fixedly installed between the sealing block 26 and the sealing groove 25. When in use, after the steel needle 7 is inserted into the blood vessel of the infusion recipient together with the catheter 6, , adjust the angle between the steel needle 7 and the patient's blood vessel to 15°-30° and continue to go deeper, during which the position of the marking line 19 is observed. When the puncture hole of the steel needle 7 piercing the skin is close to the marking line 19, it can be stopped, during which the blood reflux in the connecting tube 4 is observed. Hold the sleeve 1 with one hand to keep it in place, and pinch the needle handle 18 with the other hand to pull back the fixed needle seat 17 and the steel needle 7. The steel needle 7 is pulled out of the isolation plug 2 and the fastening plug 3. The isolation plug 2 blocks the connecting tube 4 until the tip of the steel needle 7 is pulled out of the two sealing After entering the expansion slot 24 between the sealing block 26, the needle holding handle 18 can be loosened, and then the sleeve 1 is separated from the fastening plug 3, the connecting tube 4 is fixed to the arm of the infusion recipient, and the infusion connection is completed through the positive pressure connector 11. In the sleeve 1 after detachment, the tip of the steel needle 7 is located in the expansion slot 24 and due to the obstruction of the sealing block 26, the residual blood in the steel needle 7 will not seep out of the sleeve 1, thereby improving the safety of the intravenous indwelling needle during and after use, avoiding the dripping of residual blood, and reducing the subsequent contamination risk of the sleeve 1.

[0029] In addition, the offset notch 15 opened on the opposite side of the sealing block 26 makes the offset notch 15 fit together under the action of the reset spring 27 after the steel needle 7 is withdrawn, and due to the setting of the offset notch 15, the gap between the sealing blocks 26 after mutual engagement is not a straight line, but on the contrary, multiple layers of barriers are added, further strengthening the sealing of the expansion slot 24, and at the same time, the steel needle 7 can be pushed in the reverse direction, so that the tip of the steel needle 7 is inserted into the sealing block 26, so that the steel needle 7 can be completely blocked, which not only enhances its stability in the sleeve 1, but also prevents the leakage of residual blood. The material of the sealing block 26 can be selected according to the needs.

[0030] As a preferred embodiment, the connecting tube 4 and the catheter 6 are interconnected and are both sleeved on the outside of the steel needle 7. A needle holding handle 18 is fixedly installed on the top of the fixed needle seat 17. The catheter 6 will be inserted synchronously as the steel needle 7 penetrates into the blood vessel. After the steel needle 7 is removed, the catheter 6 will remain in the blood vessel for subsequent infusion. The catheter 6 is made of soft material, and the size and shape of the needle holding handle 18 can be appropriately adjusted according to the comfort of use.

[0031] As a preferred embodiment, one end of a branch tube 8 is installed on the side of the connecting tube 4, the other end of the branch tube 8 is connected to one end of an extension hose 9, a single-handed clamp 10 is provided on the outside of the extension hose 9, and the other end of the extension hose 9 is connected to a positive pressure connector 11. After fixing the catheter 6 as an indwelling needle, an external infusion needle can be connected through the positive pressure connector 11 to complete the infusion. The branch tube 8 is made of plastic material, and the structural strength of the connection between the extension hose 9 and the connecting tube 4 can be extended.

[0032] As a preferred embodiment, a balancing groove 23 is opened on the inner side of the inner groove 22, and the fixed needle seat 17 is slidably connected to the inner side of the balancing groove 23. When the steel needle 7 is pulled out, the fixed needle seat 17 will also be in the balancing groove 23. The size of the balancing groove 23 is longer than the distance the steel needle 7 is pulled out and moved. In this way, when the steel needle 7 is pulled out and enters the expansion groove 24, the fixed needle seat 17 is still in the balancing groove 23. This can ensure the stability of the steel needle 7 after it is pulled out, prevent the steel needle 7 from detaching from the top of the sleeve 1 along with the fixed needle seat 17, and improve the safety of the steel needle 7 after it is pulled out.

[0033] As a preferred embodiment, an eccentrically arranged protrusion 20 is symmetrically installed at the bottom of the sleeve 1, and a groove 21 corresponding to the position and size of the protrusion 20 is opened on the top of the fastening plug 3. The protrusion 20 is made of soft plastic material. Before inserting the steel needle 7, the sleeve 1 and the fastening plug 3 are twisted first to loosen the position where the protrusion 20 and the groove 21 are engaged, thereby improving the portability of the subsequent sleeve 1 when it is separated from the fastening plug 3 and preventing excessive movement from affecting the stability of the catheter 6. At the same time, the engagement of the protrusion 20 and the groove 21 also makes the connection between the sleeve 1 and the fastening plug 3 more stable, so that when the steel needle 7 and the catheter 6 are inserted, the sleeve 1 will not shake or fall off easily, thereby improving the safety and stability of the intravenous catheter during operation.

[0034] Embodiment 2

[0035] See also Figure 1-7In this embodiment: a marking line 19 is provided on the outside of the catheter 6 and at a position 2-3 mm away from the bottom of the connecting tube 4. The bottom end of the catheter 6 is conical in design and a uniformly distributed flow hole 12 is provided on the surface close to the conical end. The conical design of the catheter 6 makes it smoother when following the steel needle 7 into the skin and blood vessels of the infusion recipient. At the same time, the soft catheter 6 material will not be affected by the conical design at its port. The safety inside the blood vessel, at the same time, the design of the flow hole 12 can increase the flow rate of the liquid at the port of the catheter 6 during infusion, and also increase the speed of blood reflux during acupuncture, making the blood reflux more obvious, making it easier for medical staff to identify the accuracy of the catheter 6 entering the blood vessel, and improving the accuracy and convenience of the intravenous indwelling needle operation. On the other hand, it will also reduce the toughness at the port of the catheter 6, so that after entering the blood vessel, the damage to the blood vessel is reduced, the discomfort of the blood vessel is reduced, the strange feeling of the subsequent infusion recipient is reduced, and the risk of infection is reduced.

[0036] As a preferred embodiment, a protective sleeve 5 is sleeved on the outer side of the catheter 6. The protective sleeve 5 is U-shaped and the bottom tip of the steel needle 7 is sleeved therein. The top of the protective sleeve 5 is in contact with the bottom of the connecting tube 4. The protective sleeve 5 is used to wrap the steel needle 7 to prevent accidental injury by the steel needle 7 before acupuncture, thereby improving the safety of the steel needle 7 and protecting the catheter 6 to prevent damage before use.

[0037] As a preferred embodiment, expansion grooves 24 symmetrically distributed on both sides of the steel needle 7 are opened on the inner side of the inner groove 22 and between the sealing groove 25 and the balancing groove 23. When the tip of the steel needle 7 is placed in the expansion groove 24, the sleeve 1 can be separated from the fastening plug 3, and the blood remaining in the steel needle 7 may flow into the expansion groove 24 or may be retained in the steel needle 7, thereby sealing the residual blood and effectively preventing the blood from flowing out of the sleeve 1 and dripping into the outside, causing pollution and the spread of pathogens.

[0038] Embodiment 3

[0039] See also Figure 1-7In this embodiment: a support plate 13 is arranged on the outside of the sleeve 1, and a symmetrically distributed baffle 14 is arranged on the outside of the support plate 13. The sleeve 1 slides between the two baffles 14. A symmetrically distributed elastic sheet 16 is fixedly installed on the side of the support plate 13 away from the baffle 14. Before the needle is inserted, the support plate 13 is first fixed to the outside of the arm of the infusion recipient through the two symmetrically distributed elastic sheets 16, and then the position is adjusted so that the sleeve 1 is located above the two baffles 14. After the steel needle 7 pierces the blood vessel of the infusion recipient, the sleeve 1 is pressed downward so that the sleeve The tube 1 is in contact with the support plate 13, and the baffle 14 is attached to both sides of the sleeve 1, so that the sleeve 1 is inclined at 15°-30° to the skin surface of the arm of the infusion recipient. Under the support of the support plate 13, the sleeve 1 and the steel needle 7 are continuously pushed forward to send the catheter 6 into the blood vessel of the infusion recipient. The support plate 13 can play an effective auxiliary support effect, effectively alleviate the slight tremor of the medical staff during the advancement, greatly improve the stability of the steel needle 7 during the advancement process, effectively reduce the damage caused by the steel needle 7 to the infusion recipient, and make the intravenous indwelling needle insertion smoother.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A disposable needle-stick-proof intravenous indwelling needle, comprising a cannula (1), characterized in that: An inner groove (22) is provided on the inner side of the sleeve (1), a fastening plug (3) is clamped on the bottom of the sleeve (1), an isolation plug (2) is fixedly installed on the bottom of the fastening plug (3), a steel needle (7) penetrating the fastening plug (3) and the isolation plug (2) is slidably inserted on the inner side of the inner groove (22), the top of the steel needle (7) extends to the top of the sleeve (1) and is fixedly installed with a fixed needle seat (17) that fits the top surface of the sleeve (1), the bottom end of the steel needle (7) extends to the bottom of the isolation plug (2), and the isolation plug ( 2) is fixedly installed at the bottom of the connecting pipe (4), and a conduit (6) is fixedly installed at the bottom of the connecting pipe (4). The inner side of the inner groove (22) is provided with sealing grooves (25) symmetrically distributed on both sides of the steel needle (7). The inner side of the sealing groove (25) is slidably connected with a sealing block (26) that is tightly attached to the surface of the steel needle (7). The two sealing blocks (26) are provided with mutually fitting offset notches (15) on opposite sides. A return spring (27) in a compressed state is fixedly installed between the sealing block (26) and the sealing groove (25).

2. The disposable needle-stick-proof intravenous indwelling needle according to claim 1, characterized in that: The connecting tube (4) and the catheter (6) are connected to each other and are both sleeved on the outside of the steel needle (7). A needle holding handle (18) is fixedly installed on the top of the fixed needle seat (17).

3. The disposable needle-stick-proof intravenous indwelling needle according to claim 1, characterized in that: One end of a branch pipe (8) is connected to the side of the connecting pipe (4), the other end of the branch pipe (8) is connected to one end of an extension hose (9), a single-hand clamp (10) is provided on the outside of the extension hose (9), and the other end of the extension hose (9) is connected to a positive pressure connector (11).

4. The disposable needle-stick-proof intravenous indwelling needle according to claim 1, characterized in that: A marking line (19) is provided on the outside of the conduit (6) at a position 2-3 mm away from the bottom of the connecting pipe (4); the bottom end of the conduit (6) is conical in design and evenly distributed flow holes (12) are provided on the surface close to the conical end.

5. The disposable needle-stick-proof intravenous indwelling needle according to claim 4, characterized in that: The outer side of the catheter (6) is sleeved with a protective sleeve (5), the protective sleeve (5) is of U-shaped design and the bottom tip of the steel needle (7) is sleeved therein, and the top of the protective sleeve (5) is in contact with the bottom of the connecting tube (4).

6. The disposable needle-stick-proof intravenous indwelling needle according to claim 1, characterized in that: The bottom of the sleeve (1) is symmetrically provided with an eccentrically arranged protrusion (20), and the top of the fastening plug (3) is provided with a groove (21) corresponding to the position and size of the protrusion (20), and the protrusion (20) is made of soft plastic material.

7. The disposable needle-stick-proof intravenous indwelling needle according to claim 1, characterized in that: A balancing groove (23) is provided on the inner side of the inner groove (22), and the fixed needle seat (17) is slidably connected to the inner side of the balancing groove (23).

8. The disposable needle-stick-proof intravenous indwelling needle according to claim 1, characterized in that: A support plate (13) is arranged on the outside of the sleeve (1), and symmetrically distributed baffles (14) are arranged on the outside of the support plate (13); the sleeve (1) slides between the two baffles (14), and symmetrically distributed elastic sheets (16) are fixedly mounted on one side of the support plate (13) away from the baffles (14).

9. The disposable needle-stick-proof intravenous indwelling needle according to claim 7, characterized in that: Expansion grooves (24) symmetrically distributed on both sides of the steel needle (7) are provided on the inner side of the inner groove (22) and between the sealing groove (25) and the balancing groove (23).

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