Safe remaining needle

Abstract

The utility model discloses a safety remaining needle which comprises a long sheath, a needle seat assembly and an automatic rebounding mechanism, a tube seat is arranged in the long sheath, a steel needle is installed in the tube seat, a hose sleeve is fixedly connected to the inner circle wall face of the tube seat in a sleeved mode, and the outer circle wall face of the steel needle is movably connected with the inner circle wall face of the hose sleeve in a sleeved mode. A tube seat rubber plug and a fluid director are fixedly installed on the inner circle wall face of the tube seat, circular holes in the outer wall of the needle seat coincide with corresponding circular holes in the inner sleeve of the backflow device, backflow blood is guided into an interlayer between the inner sleeve of the backflow device and the outer sleeve of the needle seat, and then the backflow blood is guided into an interlayer between the inner sleeve of the backflow device and the outer sleeve of the needle seat through the ventilation and blood blocking functions of the membrane. And the blood is sealed in the interlayer. Due to the fact that the gap of the interlayer is small, the blood backflow function can be achieved, the amount of backflow blood is small, and after the puncture needle is discarded, little backflow blood is difficult to overflow from the small hole to cause secondary pollution, and the design safety is high.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a safety indwelling needle. Background Art

[0002] Intravenous indwelling needles are currently widely used in clinical practice. They are in the form of soft cannulae covering steel needles. After the soft cannulae and steel needle successfully puncture the human blood vessels at the same time, the steel needle is withdrawn and the soft cannula is retained in the human blood vessels. It can be retained in the blood vessels for several days, reducing the pain caused by repeated intravenous punctures and the fear of injections, alleviating the patient's anxiety, facilitating clinical medication and the infusion of emergency and critically ill patients' rescue medications, and reducing the workload of nurses. However, the intravenous indwelling needles currently used in China still have shortcomings. When the steel needle is withdrawn after the puncture, the cannula and the tube seat are open, which easily causes blood to leak out under the action of venous pressure, increasing the risk of medical staff contracting blood-borne diseases. Therefore, based on the above search and combined with the prior art, the utility model provides a safe indwelling needle to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a safe indwelling needle to solve the problems raised in the above background technology.

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

[0005] A safety indwelling needle comprises a long sheath, a needle seat assembly and an automatic rebound mechanism, wherein a tube seat is arranged inside the long sheath, a steel needle is installed inside the tube seat, a hose sleeve is fixedly sleeved on the inner circular wall of the tube seat, the outer circular wall of the steel needle is movably sleeved on the inner circular wall of the hose sleeve, a tube seat rubber plug is fixedly installed on the inner circular wall of the tube seat, and a flow guide is fixedly installed on the inner circular wall of the tube seat.

[0006] Furthermore, the needle seat assembly comprises a needle seat outer sleeve, the inner circular wall surface of the needle seat outer sleeve is fixedly sleeved with the needle seat, and the steel needle is movably sleeved with the inner circular wall surface of the needle seat.

[0007] Furthermore, the automatic rebound mechanism includes a reflux inner sleeve, which is fixedly mounted on the inner circular wall of the needle seat outer sleeve, the steel needle is elastically connected to the needle seat outer sleeve, and a buckle is installed on the outer circular wall of the needle seat outer sleeve.

[0008] Furthermore, two interlayers are arranged between the outer circumferential wall surface of the inner sleeve of the reflux device and the inner circumferential wall surface of the outer sleeve of the needle seat, and a diaphragm is fixedly installed inside the interlayer.

[0009] Furthermore, a through hole is opened in the middle of the needle seat outer sleeve for matching with the annular head of the reflux inner sleeve. The head of the needle seat outer sleeve is cylindrical with multiple steps and has a through hole opened in the middle for matching with the outer diameter of the needle seat.

[0010] Furthermore, the long sheath is in the shape of a slender tube with multiple steps, a hole is opened in the middle of one end of the long sheath, and the other end of the long sheath is closed.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The circular hole on the outer wall of the needle seat overlaps with the corresponding circular hole on the inner sleeve of the reflux device, and the reflux blood is guided to the interlayer of the inner sleeve of the reflux device and the outer sleeve of the needle seat, and then the blood is sealed in the interlayer through the air permeability and blood blocking function of the membrane. Since the gap in the interlayer is very small, the blood reflux function can be achieved, and the amount of refluxed blood is very small. After being discarded after puncture, the small amount of refluxed blood is difficult to overflow from the small hole and cause secondary pollution, so this design is safer.

[0013] 2. The elastic tube base rubber plug and the flow guide are arranged to prevent blood from overflowing from the tube base without affecting the infusion. The design is simple in structure and stable and reliable.

[0014] 3. Through the joint action of the circular notch on the outer wall of the needle seat, the buckle, the needle seat outer sleeve, the compression spring, the reflux inner sleeve and the reflux cover, when the buckle is pressed, the buckle and the circular notch on the outer wall of the needle seat are separated, and the elastic force of the compression spring drives the needle seat and the steel needle to retract into the inner cavity of the reflux inner sleeve. The function of automatically retracting the steel needle into the cavity is realized by pressing the buckle, thereby avoiding the risk of steel needle puncture after puncture. The structure is simple, stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 This is a schematic diagram of the inner sleeve structure of the reflux device of the utility model;

[0017] Figure 3 This is a schematic diagram of the needle seat jacket structure of the utility model;

[0018] Figure 4 for Figure 2 Schematic diagram of the local structure of A;

[0019] Figure 5 for Figure 3 Schematic diagram of the local structure of B.

[0020] In the figure: 1. long sheath; 2. steel needle; 3. soft sleeve; 4. tube seat; 5. rivet; 6. tube seat rubber plug; 7. deflector; 8. needle seat; 9. buckle; 10. compression spring; 11. needle seat rubber plug; 12. needle seat outer sleeve; 13. diaphragm; 14. reflux inner sleeve; 15. reflux cover. DETAILED DESCRIPTION

[0021] 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 scope of protection of the utility model.

[0022] Example 1: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A safe indwelling needle comprises a long sheath 1, a needle seat 8 assembly and an automatic rebound mechanism. A tube seat 4 is arranged inside the long sheath 1, a steel needle 2 is installed inside the tube seat 4, a hose sleeve is fixedly sleeved on the inner circumferential wall of the tube seat 4, the outer circumferential wall of the steel needle 2 is movably sleeved on the inner circumferential wall of the hose sleeve, a tube seat rubber plug 6 is fixedly installed on the inner circumferential wall of the tube seat 4, a flow guide 7 is fixedly installed on the inner circumferential wall of the tube seat 4, a hole is provided in the middle of the soft sleeve 3 for matching with the conical head of the rivet 5; the rivet 5 The head has a conical shape, a hole is opened in the middle, and its outer wall is closely attached to the outer wall of the steel needle 2. After riveting, the soft sleeve 3 is fixed to the inner hole of the tube seat 4; the tube seat 4 is hollow and has a conical hole, and the outer opening is threaded for connecting with the external heparin cap. The tube seat plug 6 is an elastic plug with a notch in the middle. The flow guide 7 has a through hole in the middle and its tip is a conical tip. After the tip of the flow guide 7 is inserted into the corresponding hole of the tube seat plug 6 for matching, the tube seat plug 6 is completely placed in the conical inner cavity of the tube seat 4;

[0023] During puncture, the steel needle 2 passes through the flow guide 7, the tube seat rubber plug 6, the tube seat 4 and the soft sleeve 3, and then pierces the vein wall. The blood flows back to the tube seat rubber plug 6 through the soft sleeve 3 and the inner cavity of the tube seat 4. At this time, the steel needle 2 is pulled out. Since the tube seat rubber plug 6 is made of elastic material, it can quickly seal the hole left after the steel needle 2 is pulled out, thereby preventing the possibility of blood overflow and causing pollution. During infusion, the heparin cap thread is connected to the external thread of the tube seat 4. The conical joint of the heparin cap brings the tip of the flow guide 7 closer to the tube seat rubber plug 6, so that the gap in the middle of the tube seat rubber plug 6 is fully opened, thereby opening the infusion channel;

[0024] After the steel needle 2 is drawn out, the elastic tube seat plug 6 retracts to seal the hole. During infusion, the heparin cap conical joint allows the tip of the flow guide 7 to open the gap in the middle of the tube seat plug 6, thereby preventing blood from overflowing from the opening of the tube seat 4 after the steel needle 2 is drawn out to cause contamination without affecting the infusion process.

[0025] The needle seat 8 assembly includes a needle seat jacket 12, the inner circumferential wall of the needle seat jacket 12 is fixedly sleeved with the needle seat 8, the steel needle 2 is movably sleeved with the inner circumferential wall of the needle seat 8, the steel needle 2 is a hollow tubular stainless steel material, one end of which has a sharp blade tip for puncturing a vein, and a notch near the blade for guiding blood into the soft sleeve 3 to generate blood return to the tube seat 4, the needle seat 8 has a hole at the upper end that matches the outer wall of the steel needle 2, and a larger hole at the lower end for tightly matching with the needle seat rubber plug 11 The outer wall of the needle seat 8 is provided with a circular notch near the lower end, which is used to lock the needle seat 8 and the steel needle 2 after the buckle 9 in the automatic rebound mechanism passes through the circular notch during puncture. The outer wall of the needle seat 8 is provided with a small hole near the middle and lower part, which is used to cooperate with the small hole in the needle seat jacket 12 in the reflux device to guide the blood into the reflux device, thereby generating reflux blood return; the needle seat rubber plug 11 is made of elastic material, which is used to cooperate with the inner hole of the needle seat 8 to close the inner hole channel of the needle seat 8, and prevent blood from flowing down from the inner hole channel to the reflux device;

[0026] The automatic rebound mechanism includes a compression spring 10, a buckle 9, a reflux inner sleeve 14, a needle seat outer sleeve 12, a diaphragm 13 and a reflux cover 15. The compression spring 10 is a material that is elastic when compressed and is cylindrical. It has an inner hole that is sleeved on the steel needle 2, one end of which is placed on the upper end of the inner hole of the needle seat 8 sheath, and the other end is placed on the lower end of the needle seat 8; the buckle 9 is L-shaped, which can be matched with the corresponding groove on the needle seat outer sleeve 12. One side of the L-shape is rectangular with an elliptical hole in the middle, which is used to lock the needle seat 8 and the steel needle 2 after matching with the annular notch on the needle seat 8 in the needle seat 8 assembly. The other side of the L-shape is rectangular and is used to press the buckle 9 by hand. The reflux inner sleeve 14 is cylindrical with a through hole in the middle. There is a raised ring on its head for sealing with the needle seat outer sleeve 12. There is a circular hole in the middle upper position. When the needle seat 8 is locked by the buckle 9, the circular hole coincides with the circular hole on the needle seat 8, and is used to guide the blood in the steel needle 2 and the needle seat 8 through the circular hole to the interlayer of the reflux inner sleeve 14 and the needle seat outer sleeve 12. There is a circular step hole on the outer surface in the middle lower part, on which a diaphragm 13 is welded, which is used to prevent blood from flowing into the reflux through the hole, but air can pass through the diaphragm 13. There is a step below the circular step hole, which is used to form a seal after welding with the lower end of the needle seat outer sleeve 12. There is a larger hole in the middle of the lower end of the reflux, and four ventilation grooves are opened around the hole, which is used for air to pass through the four ventilation grooves and then be discharged after assembly with the reflux cover 15; a through hole is opened in the middle of the needle seat outer sleeve 12, which is used to match the annular head of the reflux inner sleeve 14. Its head is cylindrical with multiple steps, with a through hole in the middle for matching with the outer diameter of the needle seat 8, and a through rectangular groove at the bottom for matching with the buckle 9. Its bottom is square with striped wings for holding by hand for easy puncture, and its tail end is welded to the step surface of the inner sleeve 14 of the reflux device and sealed; the reflux device cover 15 is cylindrical with steps, and the steps at its small end block the corresponding holes of the inner sleeve 14 of the reflux device, but the gas can pass through the gap between the two. The diaphragm 13 is made of porous weaving and welded in the circular step hole of the inner sleeve 14 of the reflux device. The diaphragm 13 has the ability to allow air to pass but prevent blood from passing;

[0027] It is assembled on the needle seat jacket 12 by the buckle 9. When puncturing, before the buckle 9 is pressed, the buckle 9 cooperates with the circular notch on the needle seat 8 to lock the needle seat 8, the steel needle 2 and the compression spring 10; when the puncture is completed, the button of the buckle 9 is pressed down a little distance, and the buckle 9 and the circular notch of the needle seat 8 are disengaged. Under the elastic force of the compression spring 10, the needle seat 8 together with the steel needle 2 are rebounded into the inner sleeve 14 of the reflux device until the bottom of the needle seat 8 reaches the end face of the reflux device cover 15. At this time, the steel needle 2 is completely retracted into the inner cavity of the inner sleeve 14 of the reflux device, thereby preventing the steel needle 2 from being exposed after puncture and injuring medical personnel. The automatic rebound function of the steel needle 2 can be realized by this device;

[0028] At the same time, the circular hole on the needle seat 8 coincides with the corresponding circular hole on the reflux inner sleeve 14, and the blood is guided to the interlayer of the reflux inner sleeve 14 and the needle seat outer sleeve 12. Since the diaphragm 13 has the ability to prevent blood from passing but allow air to pass, there is also a gap between the reflux cover 15 and the reflux inner sleeve 14 to allow air to pass, and the upper and lower parts of the interlayer of the needle seat outer sleeve 12 are sealed with the reflux inner sleeve 14, so the refluxed blood can only exist in the interlayer of the needle seat outer sleeve 12, but the air can be discharged smoothly through the diaphragm 13, the reflux inner sleeve 14 and the reflux cover 15. The blood return function can be achieved through this device, and since the interlayer space gap is small, the amount of blood return is also small;

[0029] The long sheath 1 is in the shape of an elongated multi-step tube, with an opening in the middle of one end and a closed end. The middle opening end is sleeved on the outer wall of the needle seat jacket 12 to protect the steel needle 2 and the soft sleeve 3 from being damaged.

[0030] 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. A safety indwelling needle, comprising a long sheath (1), a needle seat assembly and an automatic rebound mechanism, characterized in that: A pipe seat (4) is arranged inside the long protective sleeve (1), a steel needle (2) is installed inside the pipe seat (4), a hose sleeve is fixedly sleeved on the inner circular wall of the pipe seat (4), the outer circular wall of the steel needle (2) is movably sleeved on the inner circular wall of the hose sleeve, a pipe seat rubber plug (6) is fixedly installed on the inner circular wall of the pipe seat (4), and a flow guide (7) is fixedly installed on the inner circular wall of the pipe seat (4).

2. A safety indwelling needle according to claim 1, characterized in that: The needle seat assembly comprises a needle seat outer sleeve (12), the inner circular wall surface of the needle seat outer sleeve (12) is fixedly sleeved with a needle seat (8), and the steel needle (2) is movably sleeved with the inner circular wall surface of the needle seat (8).

3. A safety indwelling needle according to claim 2, characterized in that: The automatic rebound mechanism comprises a return device inner sleeve (14), the return device inner sleeve (14) is fixedly mounted on the inner circumferential wall surface of the needle seat outer sleeve (12), the steel needle (2) is elastically connected to the needle seat outer sleeve, and a buckle (9) is mounted on the outer circumferential wall surface of the needle seat outer sleeve (12).

4. A safety indwelling needle according to claim 3, characterized in that: Two interlayers are arranged between the outer circumferential wall surface of the reflux inner sleeve (14) and the inner circumferential wall surface of the needle seat outer sleeve (12), and a diaphragm (13) is fixedly installed inside the interlayer.

5. A safety indwelling needle according to claim 3, characterized in that: The needle seat outer sleeve (12) has a through hole in the middle for matching with the annular head of the reflux inner sleeve (14); the head of the needle seat outer sleeve (12) is cylindrical with multiple steps and has a through hole in the middle for matching with the outer diameter of the needle seat (8).

6. A safety indwelling needle according to claim 4, characterized in that: The long protective sleeve (1) is in the shape of a slender tube with multiple steps. A hole is opened in the middle of one end of the long protective sleeve (1), and the other end of the long protective sleeve (1) is closed.

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