CN221905114U - Disposable safety visual venous indwelling needle - Google Patents

Abstract

The utility model provides a disposable safe visual venous indwelling needle, comprising a puncture assembly and an indwelling assembly, wherein the puncture assembly comprises a guide needle core, a needle seat, a needle cover, an elastic member and a safety button, the needle seat is movably arranged in the needle cover, the elastic member enables the needle seat to move toward the inside of the needle cover, and the safety button limits the needle seat when it is not pressed, so that when the safety button is not pressed, the needle tip of the guide needle core is exposed outside the needle cover, and puncture can be performed, and when the safety button is pressed, the elastic member drives the needle tip to be retracted into the needle cover, which can avoid the problem of the used needle core accidentally injuring medical personnel and causing infection. Further, the needle seat and the needle cover are both made of transparent materials, and the needle seat has an observation cavity connected to the hole of the guide needle core, so that medical personnel can observe whether blood enters the observation cavity and observe the color of the blood after the guide needle core is inserted into the patient's body part, so as to conveniently and intuitively judge whether the vein is correctly punctured.

Description

Disposable safe visual intravenous catheter

Technical Field

The utility model belongs to the technical field of medical equipment, relates to a medical indwelling needle, and specifically relates to a disposable safe visual venous indwelling needle.

Background Art

Disposable intravenous catheters have been widely used in China. The use of disposable intravenous catheters in intravenous infusion can reduce the number of venous punctures, extend the interval between each venous puncture, make intravenous infusion more convenient, reduce the workload of nurses, and are welcomed by more and more patients. The catheterization operation is simple, the success rate is high, and the side effects are small. It can significantly reduce the pain caused by multiple venous punctures to patients, which can not only ensure intravenous medication, but also improve the work efficiency of nurses. At present, the structural types of disposable intravenous catheters in China are mostly pen-type, dosing type, butterfly type, and structural type. In addition, there are catheters of different lengths to choose from to improve the work efficiency of nurses and use drugs rationally, avoid multiple intermittent infusions every day, reduce punctures and fail to take medication on time, avoid reactions between drugs, and reduce costs.

The components of the indwelling needle core include a soft catheter/cannula that can be left in the blood vessel, and a stainless steel puncture guide needle core. When in use, the catheter and the needle core are punctured into the blood vessel together. When the catheter is fully in the blood vessel, the needle core is withdrawn, and only the soft catheter is left in the blood vessel for infusion treatment. Traditional indwelling needles have the following problems: First, during puncture, it is not easy to observe and judge whether the needle core is correctly inserted into the vein. Inexperienced physicians may mistakenly insert the artery, or mistakenly penetrate the vein and insert it into the subcutaneous tissue, which will affect the patient's treatment; second, when the puncture is completed and the needle core is withdrawn, blood is likely to gush out; third, after the puncture is completed and the needle core is withdrawn, the needle core needs to be recycled or scrapped. However, the physician is easily pierced by the exposed needle tip of the needle core and comes into contact with the patient's blood, which puts the doctor at risk of infection.

Utility Model Content

The utility model is designed to solve the above problems, and aims to provide a venous indwelling needle that can prevent blood from gushing out, facilitate medical staff to directly observe the blood return, and can safely withdraw the puncture needle. The utility model adopts the following technical solutions:

The utility model provides a disposable safe visual venous indwelling needle, characterized in that it comprises: a puncture component for puncturing a body part of a patient; and a retention component for being retained on the body part after puncture for infusion, wherein the puncture component comprises: a needle seat; a guide needle core, which is arranged on the needle seat and used for puncture; a needle cover, wherein the needle seat is movably arranged in the needle cover; an elastic member, the two ends of which are respectively abutted against the needle seat and the inside of the needle cover, and are used to move the needle seat toward the inside of the needle cover; and a safety pressing button, which is arranged on the needle cover and is used to limit the needle seat in an initial state without being pressed, so that the needle tip of the guide needle core is exposed outside the needle cover, wherein the needle seat and the needle cover are both made of transparent materials, the needle seat has a connected accommodating cavity and an observation cavity, the needle tail end of the guide needle core is embedded in the accommodating cavity, and the hole of the guide needle core is connected to the observation cavity.

The disposable safe visual venous indwelling needle provided by the utility model may also have such technical features, wherein the needle cover has an annular groove and a clearance opening connecting the annular groove with the inside of the needle cover, the outer surface of the needle seat has an external groove, the safety push button has a ring portion and a pressing portion connected to the ring portion, the ring portion is sleeved on the annular groove, and in the initial state, the external groove of the needle seat is exposed from the clearance opening, and the upper surface of the ring portion of the safety push button abuts against the side wall of the external groove, so that the elastic member is in a compressed and force-storing state.

The disposable safe visual venous indwelling needle provided by the utility model may also have such technical features, wherein the guide needle core has a central hole, an upper through hole and a lower through hole extending along its axial direction, and the observation cavity is an annular cavity, which is respectively connected to the upper through hole and the lower through hole.

The disposable safe visual venous indwelling needle provided by the utility model may also have such technical features, wherein the needle seat includes a first cylinder and a second cylinder arranged coaxially, the diameter of the first cylinder is smaller than that of the second cylinder, and the elastic member is a spring, which is sleeved on the first cylinder, and its two ends are respectively abutted against the annular end surface of the second cylinder and the step structure inside the needle cover.

The disposable safe visual venous indwelling needle provided by the utility model may also have such a technical feature, wherein one axial end of the needle cover is a closed end, and the other axial end is a connecting end for connecting the indwelling component, and striped anti-slip wings are respectively arranged on both sides of the connecting end, and the outer surface of the striped anti-slip wings has a plurality of strip-shaped protrusions.

The disposable safe visual venous indwelling needle provided by the utility model may also have such technical features, wherein the indwelling component includes: a catheter seat, which is a hollow structure and is used to be sleeved on the connecting end of the needle cover; a catheter, which is installed on the catheter seat and is used for infusion; and a check valve, which is arranged in the catheter seat and is used to prevent blood from gushing out along the catheter and the catheter seat after puncture.

The disposable safe visual venous indwelling needle provided by the utility model may also have such technical features, wherein the interior of the catheter seat is provided with an annular protrusion, and the check valve comprises: a check valve seat, which is cylindrical, has an axially through valve hole, and an annular groove on its outer periphery, the outer periphery is fitted with the interior of the catheter seat, and the annular groove is embedded with the annular protrusion; and a piston, one end of which is detachably arranged in the valve hole for sealing the valve hole.

The disposable safe visual venous indwelling needle provided by the utility model may also have such a technical feature, wherein the valve hole is a circular through hole, and one end of the piston has a double-layer umbrella ring for inserting into the valve hole and sealing the valve hole.

The disposable safe visual venous indwelling needle provided by the utility model may also have such technical features, wherein the catheter seat comprises: a main body, which is cylindrical and used to be sleeved on the connecting end of the needle cover, and the outer surface of the main body is provided with a plurality of strip-shaped protrusions; two airplane wing-shaped holding parts, which are respectively connected to the two sides of the main body; and a catheter mounting part, which is conical and used to penetrate and fix the catheter.

Function and effect of utility model

According to the utility model, the disposable safe visual venous indwelling needle comprises a puncture assembly and an indwelling assembly, wherein the puncture assembly comprises a guide needle core, a needle seat, a needle cover, an elastic member and a safety push button, the needle seat is movably arranged in the needle cover, the elastic member enables the needle seat to move toward the inside of the needle cover, and the safety push button limits the needle seat when not pressed. Therefore, when the safety push button is not pressed, under its limiting action, the needle tip of the guide needle core is exposed outside the needle cover, and puncture can be performed normally. When the safety push button is pressed, the elastic member enables the needle seat to move toward the inside of the needle cover with the guide needle core, so that the needle tip is retracted into the inside of the needle cover, which can effectively prevent the used needle core from accidentally injuring medical personnel and causing infection.

Furthermore, the needle seat and the needle cover are both made of transparent materials, and the needle seat has an observation cavity connected to the hole portion of the guide needle core arranged thereon. Therefore, after the guide needle core is inserted into the patient's body part, the medical staff can observe whether there is blood entering the observation cavity and observe the color of the blood, so as to conveniently and intuitively judge whether the vein is correctly inserted.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of a disposable safe visual intravenous indwelling needle in an embodiment of the utility model;

2 is a partially cutaway side view of a disposable safety visual intravenous indwelling needle strap in an embodiment of the present utility model;

FIG3 is a schematic structural diagram of a guide needle core in an embodiment of the present utility model;

FIG4 is a perspective view of a needle holder in an embodiment of the present utility model;

FIG5 is a cross-sectional view of the needle holder in the embodiment of the present utility model;

6 is a schematic diagram of the structure of the spring in the embodiment of the utility model;

FIG7 is a perspective view of a needle shield in an embodiment of the present utility model;

FIG8 is a cross-sectional view of a needle shield in an embodiment of the present utility model;

FIG9 is a perspective view of a safety push button in an embodiment of the present utility model;

10 is a schematic diagram of the structure of the catheter in the embodiment of the utility model;

11 is a cross-sectional view of the catheter seat in the utility model embodiment;

12 is a perspective view of a check valve in an embodiment of the present utility model;

FIG13 is a side view of the piston in the embodiment of the utility model;

Figure 14 is a cross-sectional view of the piston in the embodiment of the utility model;

FIG. 15 is a top view of the piston in the embodiment of the present utility model.

Reference numerals:

1. Guide needle core; 2. Needle seat; 3. Spring; 4. Needle cover; 5. Safety button; 6. Catheter; 7. Catheter seat; 8. Check valve seat; 9. Piston; 101. Lower through hole; 102. Upper through hole; 201. Observation cavity; 202. External groove; 203. External groove; 204. Accommodation cavity; 205. Spring contact surface; 206. Outer peripheral surface; 401. Right stripe anti-skid wing; 402. Left stripe anti-skid wing; 403. Hollow part; 501. Upper plane; 502. Pressing surface; 701. Interlayer; 702. External holding part; 703. Aircraft wing-shaped holding part; 801. Valve hole; 802. Annular groove; 901. Double-layer umbrella ring.

DETAILED DESCRIPTION

In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the disposable safe visual intravenous indwelling needle of the present invention is specifically described below in combination with embodiments and drawings.

<Example>

FIG. 1 is a stereoscopic view of a disposable safety visual venous indwelling needle in this embodiment, and FIG. 2 is a side view of a disposable safety visual venous indwelling needle with a partial cutaway view in this embodiment, showing part of its internal structure.

As shown in Fig. 1 and Fig. 2, the disposable safety visual venous indwelling needle comprises a puncture assembly 10 and an indwelling assembly 60 which can be separated from each other, wherein the puncture assembly 10 is used to puncture a body part of a patient, and comprises a guide needle core 1, a needle seat 2, a spring 3 (elastic member), a needle cover 4 and a safety button 5. The indwelling assembly 60 is used to be indwelled on a body part of a patient after puncture for infusion, and comprises a catheter 6, a catheter seat 7, a check valve 8 and a piston 9.

The structures and matching relationships of the above components will be described in detail below.

FIG. 3 is a schematic structural diagram of the guide needle core in this embodiment.

As shown in FIG3 , the guide needle core 1 is made of stainless steel and is in the shape of an elongated cylinder as a whole, and has a central hole, a lower through hole 101 and an upper through hole 102 that penetrate along its length direction. The end face of the needle tip of the guide needle core 1 is inclined relative to its length direction, and the opening of the upper through hole 102 on the end face is closer to the middle of the length direction of the guide needle core 1, while the opening of the lower through hole 101 on the end face is closer to the outer end of the guide needle core 1. The other end of the guide needle core 1 is the needle tail end, which is mounted on the needle seat 2.

FIG. 4 is a three-dimensional view of the needle seat in this embodiment, and FIG. 5 is a cross-sectional view of the needle seat in this embodiment.

As shown in FIG. 4 and FIG. 5 , the needle hub 2 is composed of two coaxial first cylinders and a second cylinder, wherein the diameter of the first cylinder is relatively smaller, and the needle hub 2 is made of a transparent material.

The first cylinder has an outer circumferential surface 206. The second cylinder has an annular end surface at one end connected to the first cylinder, which is a spring contact surface 205. The outer circumferential surface of the second cylinder has external grooves 202 and 203, and both external grooves have crescent-shaped side walls.

The needle seat 2 has a receiving cavity 204 and an observation cavity 201 connected to the receiving cavity 204. The receiving cavity 204 is a cylindrical cavity, and its extension direction is consistent with the axial direction of the first cylinder. The receiving cavity 204 extends from the end face of the first cylinder to the middle of the axial direction of the second cylinder; the observation cavity 201 is an annular cavity, and its diameter corresponds to the spacing between the lower through hole 101 and the upper through hole 102. The needle tail end of the guide needle core 1 is embedded in the receiving cavity 204, and the lower through hole 101 and the upper through hole 102 of the guide needle core 1 are respectively connected to the observation cavity 201. After the guide needle core 1 is inserted into the patient's vein, it can be observed whether blood enters the observation cavity 201, so as to determine whether the vein is correctly punctured.

FIG. 6 is a schematic diagram of the structure of the spring in this embodiment.

As shown in Figure 6, the spring 3 is a conventional steel spring. The spring 3 is mounted on the first cylinder of the needle seat 2, that is, it surrounds the outer circumferential surface 206 of the first cylinder. One end of the spring 3 abuts against the spring contact surface 205 of the needle seat 2, and the other end abuts against the step structure inside the needle cover 4.

FIG. 7 is a perspective view of the needle cover in this embodiment, and FIG. 8 is a cross-sectional view of the needle cover in this embodiment.

As shown in Figures 7 and 8, the needle shield 4 is generally cylindrical in shape and is made of transparent material. One axial end of the needle shield 4 is generally cylindrical, which is a closed end, and the other axial end is a connecting end, which is used to connect the retention assembly 60 and has a circular opening. The needle seat 2 is arranged in the needle shield 4 and can move along the axial direction of the needle shield 4. The two sides of the connecting end of the needle shield 4 are respectively provided with a right stripe anti-slip wing 401 and a left stripe anti-slip wing 402, both of which are plate-shaped, with a width greater than the diameter of the cylindrical part of the needle shield 4, and are provided with a plurality of stripe protrusions, which are used to expand the hand-holding range and increase the friction when grasping, so as to facilitate medical personnel to grasp and apply force to the retention needle, and prevent it from slipping out of the hand during use, causing medical accidents.

In addition, a hollow portion 403 is provided at the connection end of the needle shield 4, and the hollow portion 403 includes an annular groove and a clearance opening for connecting the annular groove with the interior of the needle shield 4, for installing the safety button 5. The bottom of the annular groove is divided into two parts by two clearance openings, and both parts of the bottom of the groove are arc-shaped.

FIG. 9 is a perspective view of the safety push button in this embodiment.

As shown in FIG9 , the safety button 5 is composed of a ring portion and a substantially U-shaped pressing portion, and the safety button 5 is made of elastic material. The upper surface of the ring portion is an upper plane 501, and the end surface of the pressing portion facing outward is a pressing surface 502. The ring portion of the safety button 5 is sleeved on the annular groove of the hollow portion 403 of the needle shield 4. When the needle seat 2 moves to the hollow portion 403, the outer grooves 202 and 203 of the needle seat 2 can be exposed from the yielding opening of the hollow portion 403.

In the initial state, the ring portion of the safety button 5 is roughly in contact with the bottom of the ring groove, and the upper plane 501 is in contact with the outer groove 202 or 203 of the needle seat 2 exposed from the clearance opening. At this time, the safety button 5 hooks the needle seat 2 to limit its position. When the pressing portion of the safety button 5 is pressed, its ring portion moves in the pressing direction, and the upper plane 501 is disengaged from the outer groove 202 or 203, and the needle seat 2 is no longer limited.

FIG. 10 is a schematic diagram of the structure of the catheter in this embodiment.

As shown in FIG. 10 , the catheter 6 is made of soft material and is in the shape of an elongated cylinder for infusion. The size of its end matches the size of the circular opening on the connecting end of the needle shield 4 , and can be precisely combined with the needle shield 4 .

FIG. 11 is a cross-sectional view of the catheter adapter in this embodiment.

As shown in FIG. 11 , the catheter seat 7 includes a main body in the shape of a tube, an external gripping portion 702 disposed on the outer surface of the main body, an airplane wing-shaped holding portion 703 connected to both sides of the main body, and a catheter mounting portion connected to the upper end of the main body. The main body has a structure adapted to the connecting end of the needle cover 4 inside, which can be sleeved on the connecting end of the needle cover 4. The external gripping portion 702 includes a plurality of strip-shaped protrusions disposed on the outer surface of the main body, which can effectively prevent slipping. The airplane wing-shaped holding portion 703 is roughly in the shape of a trapezoidal plate, which is used to expand the hand-holding range, making it convenient for medical personnel to grasp and apply force to the indwelling needle. The catheter mounting portion is roughly conical, with a through-tube hole extending along its axial direction and an interlayer 701 disposed in the through-tube hole. The catheter 6 is inserted into the through-tube hole, and the end of the catheter 6 is sleeved on the interlayer 701, and is clamped by the interlayer 701 and the side wall of the through-tube hole, so that the catheter 6 is fixed on the catheter seat 7.

FIG. 12 is a perspective view of the check valve in this embodiment.

As shown in Figure 12, the check valve seat 8 is generally in the shape of a flat cylinder, and has a circular valve hole 801 extending axially therethrough. The outer periphery of the check valve seat 8 has an annular groove 802, and the main body of the catheter seat 7 has an annular protrusion matching the annular groove 802. The check valve 8 is arranged in the catheter seat 7, and its outer periphery is in contact with the inner wall of the catheter seat 7, and the annular groove is fitted with the annular protrusion in the catheter seat 7, so that the check valve seat 8 is tightly fitted inside the catheter seat 7.

FIG. 13 is a side view of the piston in this embodiment, FIG. 14 is a cross-sectional view of the piston in this embodiment, and FIG. 15 is a top view of the piston in this embodiment.

As shown in FIGS. 13 to 15 , the piston 9 is made of elastic material and is cylindrical in shape as a whole, and the diameter of one axial end is smaller than the diameter of the other axial end, and a double-layered umbrella ring 901 is formed on the end with the smaller diameter, and its size is adapted to the valve hole 801. The double-layered umbrella ring 901 of the piston 9 is inserted into the valve hole 801 of the check valve seat 8 to form a check valve, which can effectively prevent blood from gushing out through the catheter 6 and the catheter seat 7 when the guide needle core 1 is withdrawn after puncture.

When the above-mentioned disposable safety visual venous indwelling needle has not been used, the safety button 5 is not pressed down, the needle seat 2 is located at the safety button 5, and the upper plane 501 of the ring portion of the safety button 5 hooks the side wall of the external groove 202 or 203 of the needle seat 2, so that the spring 3 is in a compressed state. At this time, the needle tip of the guide needle core 1 is exposed outside the needle cover 4, and the indwelling component 60 can be installed on the guide needle core 1 to perform the puncture operation.

After use, medical personnel can separate the puncture assembly 10 from the retention assembly 60 and press the pressing portion 502 of the safety button 5 to shift the safety button 5 as a whole, and move its ring portion in the pressing direction. The upper plane 501 no longer hooks the external grooves 202 and 203 of the needle seat 2. At this time, under the elastic force of the spring 3, the needle seat 2 and the guide needle core 1 are withdrawn into the needle cover 4 together, and the needle tip of the guide needle core 1 is also retracted into the needle cover 4. The puncture assembly 10 can be safely scrapped, which can effectively prevent the used guide needle core 1 from accidentally injuring medical personnel and causing infection problems.

Example Function and Effect

The disposable safe visual venous indwelling needle provided according to the present embodiment includes a puncture assembly and an indwelling assembly, wherein the puncture assembly includes a guide needle core, a needle seat, a needle cover, an elastic member and a safety push button, the needle seat is movably arranged in the needle cover, the elastic member enables the needle seat to move toward the inside of the needle cover, and the safety push button limits the needle seat when not pressed. Therefore, when the safety push button is not pressed, under its limiting action, the needle tip of the guide needle core is exposed outside the needle cover, and puncture can be performed normally. When the safety push button is pressed, the elastic member enables the needle seat to move toward the inside of the needle cover with the guide needle core, so that the needle tip is retracted into the inside of the needle cover, which can effectively prevent the used needle core from accidentally injuring medical staff and causing infection.

Furthermore, the needle seat and the needle cover are both made of transparent materials, and the needle seat has an observation cavity connected to the hole portion of the guide needle core arranged thereon. Therefore, after the guide needle core is inserted into the patient's body part, the medical staff can observe whether there is blood entering the observation cavity and observe the color of the blood, so as to conveniently and intuitively judge whether the vein is correctly inserted.

In the embodiment, striped anti-slip wings are provided on both sides of the needle cover, which can increase the friction of gripping during use, facilitate medical staff to better grip, and prevent medical accidents caused by slipping out of the hands.

In an embodiment, the retention assembly includes a catheter, a catheter seat, and a check valve (including a check valve seat and a piston with a double-layer umbrella ring). The check valve can effectively prevent blood from gushing out through the catheter and the catheter seat after the puncture assembly is removed.

In the embodiment, the outer surface of the catheter seat is provided with an external grip, which adopts a striped design and can effectively prevent slipping. Aircraft wing-shaped pressure holding areas are also provided on both sides of the catheter seat to expand the grip range, facilitate medical personnel to grasp and apply force to the indwelling needle, and make operation more convenient.

The above embodiments are only used to illustrate the specific implementation of the utility model, and the utility model is not limited to the description scope of the above embodiments. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims (9)

1. A disposable safe visual venous indwelling needle, comprising: a puncture assembly for puncturing a body part of a patient; and a retention component, used for being retained on the body part after puncture for infusion, Wherein, the puncture assembly comprises: Needle holder; A guide needle core, disposed on the needle seat, for puncture; a needle shield, wherein the needle seat is movably disposed within the needle shield; An elastic member, two ends of which are respectively in contact with the needle seat and the inside of the needle cover, and are used to move the needle seat toward the inside of the needle cover; and A safety button is provided on the needle cover and is used to limit the position of the needle seat in an initial state where it is not pressed, so that the needle tip of the guide needle core is exposed outside the needle cover. Wherein, the needle seat and the needle cover are both made of transparent materials. The needle seat has a communicating accommodation cavity and an observation cavity, the needle tail end of the guide needle core is embedded in the accommodation cavity, and the hole portion of the guide needle core is communicated with the observation cavity. 2. The disposable safe visual venous indwelling needle according to claim 1, characterized in that: The needle shield has an annular groove and a clearance opening connecting the annular groove with the interior of the needle shield. The outer surface of the needle seat has an external groove, The safety button comprises a ring portion and a pressing portion connected to the ring portion, wherein the ring portion is sleeved on the ring groove. In the initial state, the outer groove of the needle seat is exposed from the clearance opening, and the upper surface of the ring portion of the safety button abuts against the side wall of the outer groove, so that the elastic member is in a compressed force storage state. 3. The disposable safe visual venous indwelling needle according to claim 1, characterized in that: The guide needle core has a central hole, an upper through hole and a lower through hole extending axially therethrough. The observation cavity is an annular cavity, which is communicated with the upper through hole and the lower through hole respectively. 4. The disposable safe visual venous indwelling needle according to claim 1, characterized in that: The needle seat includes a first cylinder and a second cylinder arranged coaxially, and the diameter of the first cylinder is smaller than that of the second cylinder. The elastic member is a spring, which is sleeved on the first cylinder, and the two ends of the elastic member are respectively in contact with the annular end surface of the second cylinder and the step structure inside the needle shield. 5. The disposable safe visual venous indwelling needle according to claim 1, characterized in that: One axial end of the needle shield is a closed end, and the other axial end is a connecting end for connecting the retention assembly. The two sides of the connecting end are respectively provided with striped anti-slip wings. The outer surface of the striped anti-skid wing is provided with a plurality of strip-shaped protrusions. 6. The disposable safe visual venous indwelling needle according to claim 1, characterized in that: Wherein, the retention component comprises: The catheter seat is a hollow structure and is used to be sleeved on the connecting end of the needle shield; a catheter, mounted on the catheter seat, for infusion; and The check valve is arranged in the catheter seat and is used to prevent blood from gushing out along the catheter and the catheter seat after puncture. 7. The disposable safe visual venous indwelling needle according to claim 6, characterized in that: Wherein, the catheter seat has an annular protrusion inside. The check valve comprises: The check valve seat is cylindrical, has an axially penetrating valve hole, and has an annular groove on its outer circumference, wherein the outer circumference fits the inside of the catheter seat, and the annular groove fits the annular protrusion; and A piston has one end detachably disposed in the valve hole and is used to seal the valve hole. 8. The disposable safe visual venous indwelling needle according to claim 7, characterized in that: Wherein, the valve hole is a circular through hole, One end of the piston is provided with a double-layer umbrella ring for inserting into the valve hole and sealing the valve hole. 9. The disposable safe visual venous indwelling needle according to claim 6, characterized in that: Wherein, the catheter seat comprises: The main body is in a cylindrical shape and is used to be sleeved on the connecting end of the needle shield. The outer surface of the main body is provided with a plurality of strip-shaped protrusions; Two aircraft wing-shaped holding parts are respectively connected to two sides of the main body; and The catheter installation part is cone-shaped and is used to penetrate and fix the catheter.