Medical needle and method of use

Abstract

A medical needle and a method of use, the medical needle comprises an inner tube, the inner tube is fixedly connected with a needle tip, a liquid channel II is arranged in the needle tip; an outer tube is sleeved on the inner tube, the outer tube comprises a sleeve, a limit block II is arranged on the inner tube, the sleeve is connected with a baffle I, the baffle I is arranged in front of the limit block II, an elastic component is arranged between the limit block II and the baffle I, a positioning switch is connected between the inner tube and the outer tube, when the positioning switch positions the inner tube and the outer tube, the front end of the needle tip is located outside the outer tube; when the positioning switch does not position the inner tube and the outer tube, under the action of the elastic component, the front end of the needle tip is located inside the outer tube. The medical staff presses the outer tube, and by controlling the positioning switch, the outer tube and the inner tube are dislocated, and under the action of the elastic component, the needle tip is automatically drawn out of the patient's blood vessel and enters the outer tube, so as to avoid the exposed needle tip from stabbing the medical staff or others.

Description

Technical Field

[0001] The present invention relates to the technical field of medical needles, in particular to a medical needle and a use method thereof. The medical needle can be used in operations such as blood sampling and infusion. Background Art

[0002] With the development of the economy, people pay more and more attention to their own health. Thanks to the advancement of medical technology, many instruments can now be used to conduct human health examinations or treatments. Blood drawing is one of the common detection items, and infusion is a commonly used clinical method.

[0003] It is known that many diseases are transmitted through blood, among which pricking a needle that has been used to draw blood or a needle that has been used for infusion is one of the common routes of infection. Therefore, medical staff must be careful to handle used blood collection needles and infusion needles to avoid pricking themselves or others.

[0004] The commonly used blood collection needles and infusion needles now include needles with liquid channels, one end of the needle is covered with a needle cover, and the other end of the needle is connected to a syringe or a hose. When in use, the needle cover is pulled off and the exposed needle is inserted into the patient's blood vessel. After use, the medical staff pulls the needle out of the patient's blood vessel, and then uses a needle cover to cover the end of the needle pulled out of the patient's blood vessel, and collects and centralizes the treatment. However, after the needle is pulled out and the needle cover is put on, it is often possible for the medical staff to accidentally stab themselves or others, causing harm. In addition, when the medical staff uses it, after pulling off the needle cover, it is easy to lose the needle cover, causing the used needle to be exposed, which puts themselves or others at risk of harm. This is the difference of the existing technology. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a medical needle in view of the shortcomings of the prior art. The medical staff presses the outer tube and controls the positioning switch to disengage the outer tube from the inner tube. Under the action of the elastic component, the needle tip automatically enters the interior of the outer tube to prevent the needle tip from being exposed and injuring the medical staff or others.

[0006] The present scheme is realized through the following technical measures: a medical needle, comprising an inner tube, the inner tube being fixedly connected with a needle tip, wherein a liquid channel II is arranged in the needle tip; an outer tube is sleeved on the inner tube, the outer tube comprising a sleeve, a limit block II is arranged on the inner tube, the sleeve is connected with a baffle I, the baffle I is arranged in front of the limit block II, an elastic component is arranged between the limit block II and the baffle I, a positioning switch is connected between the inner tube and the outer tube, when the positioning switch positions the inner tube and the outer tube, the front end of the needle tip is located outside the outer tube; when the positioning switch does not position the inner tube and the outer tube, under the action of the elastic component, the front end of the needle tip is located inside the outer tube. With this technical solution, when the positioning switch positions the inner tube and the outer tube, there is no relative movement between the inner tube and the outer tube. The medical staff inserts the needle tip into the patient's blood vessel. After completing the blood collection or infusion operation, the medical staff first withdraws the needle tip from the patient's blood vessel, and then presses the outer tube to control the positioning switch so that the inner tube and the outer tube are dislocated, and the needle tip enters the inner part of the outer tube under the action of the elastic component; or the medical staff presses the outer tube and controls the positioning switch so that the inner tube and the outer tube are dislocated, and the needle tip is automatically withdrawn from the patient's blood vessel and enters the inner part of the outer tube under the action of the elastic component. The medical needle has a simple structure and a clever design, which effectively prevents the blood collection needle tip or the infusion needle tip from being exposed and stabbing the medical staff or others.

[0007] Preferably, the liquid channel of the needle can be in the following two ways:

[0008] (i) The needle tip penetrates the inner tube.

[0009] (ii) The inner tube is provided with a liquid channel I which is connected with the liquid channel II.

[0010] Preferably, the elastic component is always in a compressed state. With this technical solution, when the positioning switch positions the inner tube and the outer tube, the elastic component is in a compressed state, which can ensure that after the inner tube and the outer tube are out of position, the medical staff presses the outer tube, and the restoring force of the elastic component can push the inner tube backward; after the needle tip enters the inner part of the outer tube, the elastic component is still in a compressed state, which can ensure that the needle tip is stably located inside the outer tube, even if the outer tube is placed vertically (that is, the front end of the outer tube is downward), the needle tip cannot overcome the elastic force of the elastic component. Therefore, no matter how the medical needle is placed, the needle tip is located inside the outer tube without the action of external force, which effectively improves safety.

[0011] Preferably, the elastic component is a spring I or an elastic ring, and the spring I or the elastic ring is sleeved on the inner tube. With this technical solution, the price of the spring I and the elastic ring is cheap, and the elastic deformation is large. The spring I and the elastic ring are sleeved on the inner tube, which effectively ensures stability.

[0012] Preferably, the elastic component has the following two configurations:

[0013] (i) The baffle I is connected to the front of the sleeve, and when the positioning switch positions the inner tube and the outer tube, the elastic component is arranged at the front inside the outer tube.

[0014] Preferably, the limit block II is slidably matched with the sleeve, and the rear end of the sleeve is connected to a limit structure, and the limit structure is a limit protrusion arranged on the inner wall of the sleeve or a limit plate fixedly connected to the rear end of the outer tube. With this technical solution, the limit structure can prevent the inner tube from sliding out of the rear end of the outer tube under the action of the elastic component. When the needle tip enters the outer tube, the rear end of the limit block II presses against the front end of the limit structure.

[0015] Preferably, the front end of the limiting structure is provided with a barb structure, the barb structure includes a barb, one end of the barb is rotatably connected to the sleeve, a spring II is connected between the barb and the sleeve, and the sleeve is provided with a groove or through hole for accommodating the barb structure. With this technical solution, under normal conditions, one end of the barb extends into the sleeve under the action of spring II, and when the inner tube and the outer tube do not need to be positioned, under the action of spring I, the inner tube moves backward, and the limiting block II pushes the barb to compress the spring II until the barb is pressed into the groove or through hole of the sleeve. After the limiting block II passes through the barb structure, one end of the barb is reset to the sleeve under the action of spring II, and even if the inner tube is pushed forward, the limiting block II cannot move forward through the barb structure.

[0016] Preferably, the distance between the limiting structure and the barb structure is greater than or equal to the thickness of the limiting block II. With this technical solution, when the inner tube and the outer tube are not limited, the limiting block II can be limited between the limiting structure and the barb structure, thereby limiting the needle tip in the outer tube.

[0017] (ii) The baffle I is connected to the middle of the sleeve, and when the positioning switch positions the inner tube and the outer tube, the elastic component is completely arranged at the rear of the outer tube or a part of the elastic component is arranged at the rear of the outer tube and the other part is arranged outside the outer tube.

[0018] Preferably, the inner tube is provided with a limit block III, the limit block III is arranged at the front end of the baffle I, and the limit block II and / or the limit block III are slidably matched with the sleeve. With this technical solution, when the needle tip enters the outer tube, the rear end of the limit block III presses against the front end of the baffle I, preventing the inner tube from sliding out of the rear end of the outer tube.

[0019] Preferably, the front end of the baffle I is provided with a barb structure, the barb structure includes a barb, one end of the barb is rotatably connected to the sleeve, a spring II is connected between the barb and the sleeve, and the sleeve is provided with a groove or through hole to accommodate the barb structure. With this technical solution, under normal conditions, one end of the barb extends into the sleeve under the action of spring II, and when the inner tube and the outer tube do not need to be positioned, under the action of spring I, the inner tube moves backward, and the limit block III pushes the barb and compresses the spring II until the barb is pressed into the groove or through hole of the sleeve. After the limit block III passes through the barb structure, one end of the barb is reset to the sleeve under the action of spring II, and even if the inner tube is pushed forward, the limit block III cannot move forward through the barb structure.

[0020] Preferably, the distance between the baffle plate I and the barb structure is greater than or equal to the thickness of the limit block III. With this technical solution, when the inner tube and the outer tube are not limited, the limit block III can be limited between the baffle plate I and the barb structure, thereby limiting the needle tip in the outer tube.

[0021] Preferably, a limiting block I is provided at the rear end of the inner tube.

[0022] Preferably, the rear end of the inner tube is connected with a connector. According to the technical solution, the connector is a connecting tube fixedly connected to the rear end of the inner tube, and the connector is used to connect the medical needle to the blood collection hose of the blood collector or the infusion hose of the infusion collector, so as to facilitate the needle to be inserted into any part of the body for blood collection or infusion operation.

[0023] Preferably, the lower end surface of the outer tube is a plane. By adopting this technical solution, the lower end surface of the outer tube is set to be a plane, which is convenient for medical staff to fix the needle.

[0024] Preferably, a handle is fixedly provided at one end of the sleeve. With this technical solution, the handle is provided to facilitate the operation of medical personnel to insert the needle tip into the patient's blood vessel.

[0025] Preferably, when the medical needle is not in use, a needle cap is provided on the needle tip. With this technical solution, the needle cap is used to protect the needle tip and prevent contamination of the needle tip.

[0026] Preferably, the positioning switch includes a positioning pin, the sleeve is provided with a positioning hole II matching the positioning pin, and the inner tube is provided with a positioning hole I matching the positioning pin.

[0027] Preferably, the positioning hole I is arranged on the limiting block II or the limiting block III.

[0028] The structural forms of the positioning switch include the following two types:

[0029] (i) When the positioning pin is used to position the inner tube and the outer tube, one end of the positioning pin is arranged in the positioning hole I, the middle part of the positioning pin is arranged in the positioning hole II, and the other end of the positioning pin is arranged outside the outer tube. When the inner tube and the outer tube do not need to be positioned, the positioning pin is pulled out from the positioning hole I and the positioning hole II.

[0030] (ii) When the positioning pin is used to position the inner tube and the outer tube, one end of the positioning pin is located in the positioning hole II, and the other end of the positioning pin is located in the positioning hole I. When the inner tube and the outer tube do not need to be positioned, the positioning pin is completely located in the positioning hole I. With this technical solution, when the inner tube and the outer tube do not need to be positioned, medical staff can push the positioning pin inward through the positioning hole II by wearing a pin on the finger to completely push the positioning pin into the positioning hole I.

[0031] A medical needle comprises an inner tube, the inner tube is fixedly connected with a needle tip, a liquid channel II is arranged in the needle tip; an outer tube is sleeved on the inner tube, a limit block I is arranged at the rear of the inner tube, an elastic component is arranged between the rear end of the outer tube and the limit block I, the elastic component is arranged outside the outer tube, a positioning switch is connected between the inner tube and the outer tube, when the positioning switch positions the inner tube and the outer tube, the front end of the needle tip is located outside the outer tube, when the positioning switch does not position the inner tube and the outer tube, under the action of the elastic component, the front end of the needle tip is located inside the outer tube. With this technical solution, when the positioning switch positions the inner tube and the outer tube, there is no relative movement between the inner tube and the outer tube. The medical staff inserts the needle tip into the patient's blood vessel. After completing the blood collection or infusion operation, the medical staff first withdraws the needle tip from the patient's blood vessel, and then presses the outer tube to control the positioning switch so that the inner tube and the outer tube are dislocated, and the needle tip enters the inner part of the outer tube under the action of the elastic component; or the medical staff presses the outer tube and controls the positioning switch so that the inner tube and the outer tube are dislocated, and the needle tip is automatically withdrawn from the patient's blood vessel and enters the inner part of the outer tube under the action of the elastic component. The medical needle has a simple structure and a clever design, which effectively prevents the blood collection needle tip or the infusion needle tip from being exposed and stabbing the medical staff or others.

[0032] Preferably, the liquid channel of the needle can be in the following two ways:

[0033] (i) The needle tip penetrates the inner tube.

[0034] (ii) The inner tube is provided with a liquid channel I which is connected with the liquid channel II.

[0035] Preferably, the elastic component is always in a compressed state. With this technical solution, when the positioning switch positions the inner tube and the outer tube, the elastic component is in a compressed state, which can ensure that after the inner tube and the outer tube are out of position, the medical staff presses the outer tube, and the restoring force of the elastic component can push the inner tube backward; after the needle tip enters the inner part of the outer tube, the elastic component is still in a compressed state, which can ensure that the needle tip is stably located inside the outer tube, even if the outer tube is placed vertically (that is, the front end of the outer tube is downward), the needle tip cannot overcome the elastic force of the elastic component. Therefore, no matter how the medical needle is placed, the needle tip is located inside the outer tube without the action of external force, which effectively improves safety.

[0036] Preferably, the elastic component is a spring I or an elastic ring, and the spring I or the elastic ring is sleeved on the inner tube. With this technical solution, the price of the spring I and the elastic ring is cheap, and the elastic deformation is large. The spring I and the elastic ring are sleeved on the inner tube, which effectively ensures stability.

[0037] Preferably, the positioning switch includes a positioning pin, the outer tube is provided with a positioning hole II matching the positioning pin, and the inner tube is provided with a positioning hole III matching the positioning pin.

[0038] The structural forms of the positioning switch include the following two types:

[0039] (i) When the positioning pin is used to position the inner tube and the outer tube, one end of the positioning pin is arranged in the positioning hole III, the middle part of the positioning pin is arranged in the positioning hole II, and the other end of the positioning pin is arranged outside the outer tube. When the inner tube and the outer tube do not need to be positioned, the positioning pin is pulled out from the positioning hole III and the positioning hole II.

[0040] (ii) When the positioning pin is used to position the inner tube and the outer tube, one end of the positioning pin is located in the positioning hole II, and the other end of the positioning pin is located in the positioning hole III. When the inner tube and the outer tube do not need to be positioned, the positioning pin is completely located in the positioning hole III. With this technical solution, when the inner tube and the outer tube do not need to be positioned, medical staff can push the positioning pin inward through the positioning hole II by wearing a pin on the finger to completely push the positioning pin into the positioning hole III.

[0041] Preferably, a limit block III is provided on the inner tube, and the limit block III can be slidably matched with the sleeve. With this technical solution, under the action of the elastic component, the inner tube slides in the outer tube, and the limit block III can guide the movement of the inner tube, thereby improving the stability of the inner tube when moving.

[0042] Preferably, a limiting structure is provided at the rear end of the sleeve, and the limiting structure is a limiting protrusion provided on the inner wall of the sleeve, or the limiting structure is a baffle II connected to the rear end of the sleeve. With this technical solution, a limiting structure is provided to prevent the inner tube from slipping out of the outer tube.

[0043] Preferably, the elastic component is arranged between the baffle II and the limit block I. With this technical solution, the baffle II is arranged to facilitate the positioning and installation of the elastic component.

[0044] Preferably, the front end of the limiting structure is provided with a barb structure, the barb structure includes a barb, one end of the barb is rotatably connected to the sleeve, a spring II is connected between the barb and the sleeve, and the sleeve is provided with a groove or through hole to accommodate the barb structure. With this technical solution, under normal conditions, one end of the barb extends into the sleeve under the action of spring II, and when the inner tube and the outer tube do not need to be positioned, under the action of spring I, the inner tube moves backward, and the limiting block III pushes the barb and compresses spring II until the barb is pressed into the groove or through hole of the sleeve. After the limiting block III passes through the barb structure, one end of the barb is reset to the sleeve under the action of spring II, and even if the inner tube is pushed forward, the limiting block III cannot move forward through the barb structure.

[0045] Preferably, the distance between the limiting structure and the barb structure is greater than or equal to the thickness of the limiting block III. With this technical solution, when the inner tube and the outer tube are not limited, the limiting block III can be limited between the limiting structure and the barb structure, thereby limiting the needle tip in the outer tube.

[0046] Preferably, the limit block I is connected with a connector. In this technical solution, the connector is a connecting tube fixedly connected to the rear end of the inner tube, and the connector is used to connect the medical needle to the blood collection hose of the blood collector or the infusion hose of the infusion set.

[0047] Preferably, the lower end surface of the outer tube is a plane. By adopting this technical solution, the lower end surface of the outer tube is set to be a plane, which is convenient for medical staff to fix the needle.

[0048] Preferably, a handle is fixedly provided at one end of the sleeve. With this technical solution, the handle is provided to facilitate the operation of medical personnel to insert the needle tip into the patient's blood vessel.

[0049] Preferably, when the medical needle is not in use, a needle cap is provided on the needle tip. With this technical solution, the needle cap is used to protect the needle tip and prevent contamination of the needle tip.

[0050] The medical needle can be used on a blood sampling set and an infusion set.

[0051] A method for using a medical needle comprises the following steps:

[0052] (1) The positioning switch positions the inner tube and the outer tube, the needle tip is located at the front end of the outer tube, and the medical staff inserts the needle tip into the patient's blood vessel;

[0053] (2) After completing the blood collection or infusion operation, the medical staff first withdraws the needle tip from the patient's blood vessel, and then presses the outer tube to control the positioning switch so that the inner tube and the outer tube are dislocated, and the needle tip enters the outer tube under the action of the elastic component; or the medical staff presses the outer tube to control the positioning switch so that the inner tube and the outer tube are dislocated, and the needle tip is automatically withdrawn from the patient's blood vessel and enters the outer tube under the action of the elastic component.

[0054] It can be seen that compared with the prior art, the present invention has outstanding substantive features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1 when the needle tip is exposed from the outer tube;

[0056] Figure 2 This is a schematic diagram of the structure of Example 1 when the needle tip is exposed from the outer tube;

[0057] Figure 3 for Figure 2 AA cross-sectional structure diagram in;

[0058] Figure 4 It is a schematic diagram of the three-dimensional structure of the outer tube of Example 1;

[0059] Figure 5 is a schematic diagram of the three-dimensional structure of the inner tube of Example 1;

[0060] Figure 6 This is a schematic diagram of the three-dimensional structure when the needle tip of Example 1 is returned to the outer tube;

[0061] Figure 7 The structure of Example 1 when the needle tip returns to the outer tube Figure 1 ;

[0062] Figure 8 for Figure 7 BB cross-sectional structure diagram in FIG.

[0063] Fig. 9 The structure of Example 1 when the needle tip returns to the outer tube Figure 2 ;

[0064] Fig.10 for Fig. 9 Schematic diagram of CC cross-sectional structure;

[0065] Fig.11 This is a schematic diagram of the structure of Example 2 when the needle tip is exposed from the outer tube;

[0066] Fig.12 for Fig.11 DD cross-sectional structure diagram in;

[0067] Fig.13 It is a schematic diagram of the three-dimensional structure of the outer tube of Example 2;

[0068] Fig.14 is a schematic diagram of the three-dimensional structure of the inner tube of Example 2;

[0069] Fig.15 This is a schematic diagram of the structure when the needle tip of Example 2 is returned to the outer tube;

[0070] Fig.16 for Fig.15 EE cross-sectional structure diagram in;

[0071] Fig.17 This is a schematic diagram of the structure of Example 3 when the needle tip is exposed from the outer tube;

[0072] Fig.18 This is a schematic diagram of the structure when the needle tip of Example 3 is returned to the outer tube;

[0073] Fig.19 This is a schematic diagram of the structure of Example 4 when the needle tip is exposed from the outer tube;

[0074] Fig. 20 for Fig.19 A schematic diagram of the enlarged structure of the middle part A;

[0075] Fig.21 This is a schematic diagram of the structure when the needle tip of Example 4 is returned to the outer tube;

[0076] Fig. 22 for Fig.21 The enlarged structural diagram of the middle B part;

[0077] Fig.23 This is a schematic diagram of the structure of Example 5 when the needle tip is exposed from the outer tube;

[0078] Fig.24 for Fig.23 The enlarged structural diagram of the middle C part;

[0079] Fig.25 This is a schematic diagram of the structure when the needle tip of Example 5 is returned to the outer tube;

[0080] Fig.26 for Fig.25 The enlarged structural diagram of the middle D part;

[0081] Fig. 27 This is a schematic diagram of the structure of Example 6 when the needle tip is exposed from the outer tube;

[0082] Fig.28 for Fig. 27 The enlarged structural diagram of the middle E part;

[0083] Fig.29This is a schematic diagram of the structure when the needle tip of Example 6 is returned to the outer tube;

[0084] Fig.30 for Fig.29 The enlarged structural diagram of the middle F part;

[0085] Fig.31 is a schematic structural diagram of Example 7;

[0086] Fig.32 is a schematic structural diagram of Example 8;

[0087] Fig.33 This is a schematic diagram of the structure of Example 9.

[0088] In the figure: 1-inner tube, 1.1-limiting block I, 1.2-limiting block II, 1.2.1-positioning hole I, 1.3-limiting block III, 1.4-positioning hole III, 2-needle tip, 3-liquid channel I, 4-outer tube, 4.1-sleeve, 4.1.1-handle, 4.1.2-positioning hole II, 4.1.3-limiting protrusion, 5-connecting piece, 6-positioning pin, 7-baffle I, 8-spring I, 9-liquid channel II, 10-baffle II, 11-barb, 12-spring II. DETAILED DESCRIPTION

[0089] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods and in conjunction with the accompanying drawings.

[0090] Example 1

[0091] like Figure 1-10As shown, a medical needle comprises an inner tube 1, a needle tip 2 is fixedly connected to the front end of the inner tube 1, a liquid channel I3 is arranged in the inner tube 1, and a liquid channel II9 connected to the liquid channel I3 is arranged in the needle tip 1; an outer tube 4 is sleeved on the inner tube 1, and the outer tube 4 comprises a sleeve 4.1, a limiting block II1.2 is arranged in the middle of the inner tube 1, the limiting block II1.2 is fixedly connected to the inner tube 1 or the limiting block II1.2 is integrally formed with the inner tube 1, and the front end of the sleeve 4.1 A baffle I7 is provided at the end, and the baffle I7 is fixedly connected to the sleeve 4.1. An elastic component is provided between the limit block II1.2 and the baffle I7, and the elastic component is arranged in the outer tube 4. A positioning switch is connected between the inner tube 1 and the outer tube 4. When the positioning switch positions the inner tube 1 and the outer tube 4, the front end of the needle tip 2 is located outside the outer tube 4. When the positioning switch does not position the inner tube 1 and the outer tube 4, under the action of the elastic component, the front end of the needle tip 2 is located inside the outer tube 4. When the positioning switch positions the inner tube 1 and the outer tube 4, there is no relative movement between the inner tube 1 and the outer tube 4. The medical staff inserts the needle tip 2 into the patient's blood vessel. After completing the blood collection or infusion operation, the medical staff first withdraws the needle tip 2 from the patient's blood vessel, and then presses the outer tube 4 to control the positioning switch so that the inner tube 1 and the outer tube 4 are dislocated, and the needle tip 2 enters the outer tube 4 under the action of the elastic component; or the medical staff presses the outer tube 4 to control the positioning switch so that the inner tube 1 and the outer tube 4 are dislocated, and the needle tip 2 is automatically withdrawn from the patient's blood vessel and enters the outer tube 4 under the action of the elastic component.

[0092] The elastic component is always in a compressed state. When the positioning switch positions the inner tube 1 and the outer tube 4, the elastic component is in a compressed state, which can ensure that after the inner tube 1 and the outer tube 4 are out of position, the medical staff presses the outer tube 4, and the restoring force of the elastic component can push the inner tube 1 backward; after the needle tip 2 enters the inner part of the outer tube 4, the elastic component is still in a compressed state, which can ensure that the needle tip 2 is stably located inside the outer tube 4, even if the outer tube 4 is placed vertically (that is, the front end of the outer tube 4 is downward), the needle tip 2 cannot overcome the elastic force of the elastic component. Therefore, no matter how the medical needle is placed, the needle tip 2 is located inside the outer tube 4 without the action of external force, which effectively improves safety.

[0093] The elastic component is a spring Ⅰ8 or an elastic ring, and the spring Ⅰ8 or the elastic ring is sleeved on the inner tube 1. The spring Ⅰ8 and the elastic ring are cheap and have large elastic deformation. The spring Ⅰ8 and the elastic ring are sleeved on the inner tube 1 to effectively ensure stability.

[0094] The positioning switch includes a positioning pin 6, a positioning hole II4.1.2 matching the positioning pin 6 is provided on the outer tube 4, and a positioning hole I1.2.1 matching the positioning pin 6 is provided on the inner tube 1. When the positioning pin 6 positions the inner tube 1 and the outer tube 4, one end of the positioning pin 6 is arranged in the positioning hole I1.2.1, the middle part of the positioning pin 6 is arranged in the positioning hole II4.1.2, and the other end of the positioning pin 6 is arranged outside the outer tube 4. When the inner tube 1 and the outer tube 4 do not need to be positioned, the medical staff can pull the positioning pin 6 out of the positioning hole I1.2.1 and the positioning hole II4.1.2.

[0095] In the present technical solution, the positioning hole Ⅰ1.2.1 is set on the limit block Ⅱ1.2. When the positioning pin 6 positions the inner tube 1 and the outer tube 4, one end of the positioning pin 6 is located in the positioning hole Ⅱ4.1.2, and the other end of the positioning pin 6 is located in the positioning hole Ⅰ1.2.1. The positioning pin 6 is not exposed. When the inner tube 1 and the outer tube 4 do not need to be positioned, the positioning pin 6 is completely located in the positioning hole Ⅰ1.2.1. When the inner tube 1 and the outer tube 4 do not need to be positioned, the medical staff can push the positioning pin 6 inward through the positioning hole Ⅱ4.1.2 by wearing a pin on the finger to completely push the positioning pin 6 into the positioning hole Ⅰ1.2.1.

[0096] The limit block II1.2 is slidably matched with the sleeve 4.1, and a limit structure is arranged at the rear end of the outer tube 4. The limit structure is a limit protrusion 4.1.3 arranged on the inner wall of the sleeve 4.1 or a limit plate fixedly connected to the rear end of the sleeve 4.1, and the limit protrusion 4.1.3 is fixedly connected to the inner wall of the sleeve 4.1. The limit structure can prevent the inner tube 1 from sliding out of the rear end of the outer tube 4 under the action of the elastic component. When the needle tip 2 enters the outer tube 4, the rear end of the limit block II1.2 presses against the front end of the limit structure.

[0097] A limiting block Ⅰ1.1 is disposed at the rear end of the inner tube 1, and the limiting block Ⅰ1.1 is fixedly connected to the inner tube 1, or the limiting block Ⅰ1.1 is integrally formed with the inner tube 1.

[0098] The rear end of the inner tube 1 is fixedly connected with a connector 5. The connector 5 is a connecting tube fixedly connected to the rear end of the inner tube 1, and is used to connect the medical needle to the blood collection hose of the blood collector or the infusion hose of the infusion set.

[0099] The lower end surface of the outer tube 4 is a plane, which is convenient for medical staff to fix the needle.

[0100] A handle 4.1.1 is fixedly provided at the right end of the sleeve 4.1, and the handle 4.1.1 is provided to facilitate the operation of medical staff to insert the needle tip 2 into the patient's blood vessel.

[0101] When the medical needle is not in use, a needle cap (not shown in the figure) is placed on the needle tip 2 to protect the needle tip 2 and prevent the needle tip 2 from being contaminated.

[0102] Example 2

[0103] like Figure 11-16 As shown, a medical needle comprises an inner tube 1, the front end of the inner tube 1 is fixedly connected with a needle tip 2, a liquid channel Ⅰ3 is arranged in the inner tube 1, and a liquid channel Ⅱ9 connected with the liquid channel Ⅰ3 is arranged in the needle tip 2; an outer tube 4 is sleeved on the inner tube 1, and the outer tube 4 comprises a sleeve 4.1, a limit block Ⅰ1.1 is arranged at the rear of the inner tube 1, and the limit block Ⅰ1.1 is fixedly connected with the inner tube 1, or the limit block Ⅰ1.1 is integrally formed with the inner tube 1, and an elastic component is arranged between the rear end of the outer tube 4 and the limit block Ⅰ1.1, and the elastic component is arranged between the rear end of the outer tube 4 and the limit block Ⅰ1.1, and the elastic component is arranged between the rear end of the outer tube 4 and the limit block Ⅰ1.1, and the elastic component is arranged between the inner tube 1 ... The elastic component is arranged on the outside of the outer tube 4, the front end of the sleeve 4.1 is provided with a baffle I7, and the baffle I7 is fixedly connected to the sleeve 4.1, the rear end of the sleeve 4.1 is provided with a baffle II10, and the baffle II10 is fixedly connected to the sleeve 4.1, and a positioning switch is connected between the inner tube 1 and the outer tube 4. When the positioning switch positions the inner tube 1 and the outer tube 4, the front end of the needle tip 2 is located outside the outer tube 4. When the positioning switch does not position the inner tube 1 and the outer tube 4, under the action of the elastic component, the front end of the needle tip 2 is located inside the outer tube 4. When the positioning switch positions the inner tube 1 and the outer tube 4, there is no relative movement between the inner tube 1 and the outer tube 4. The medical staff inserts the needle tip 2 into the patient's blood vessel. After completing the blood collection or infusion operation, the medical staff first withdraws the needle tip 2 from the patient's blood vessel, and then presses the outer tube 4 to control the positioning switch so that the inner tube 1 and the outer tube 4 are dislocated, and the needle tip 2 enters the outer tube 4 under the action of the elastic component; or the medical staff presses the outer tube 4 to control the positioning switch so that the inner tube 1 and the outer tube 4 are dislocated, and the needle tip 2 is automatically withdrawn from the patient's blood vessel and enters the outer tube 4 under the action of the elastic component.

[0104] The elastic component is always in a compressed state. When the positioning switch positions the inner tube 1 and the outer tube 4, the elastic component is in a compressed state, which can ensure that after the inner tube 1 and the outer tube 4 are out of position, the medical staff presses the outer tube 4, and the restoring force of the elastic component can push the inner tube 1 backward; after the needle tip 2 enters the inner part of the outer tube 4, the elastic component is still in a compressed state, which can ensure that the needle tip 2 is stably located inside the outer tube 4, even if the outer tube 4 is placed vertically (that is, the front end of the outer tube 4 is downward), the needle tip 2 cannot overcome the elastic force of the elastic component. Therefore, no matter how the medical needle is placed, the needle tip 2 is located inside the outer tube 4 without the action of external force, which effectively improves safety.

[0105] The elastic component is a spring Ⅰ8 or an elastic ring, and the spring Ⅰ8 or the elastic ring is sleeved on the inner tube 1. The spring Ⅰ8 and the elastic ring are cheap and have large elastic deformation. The spring Ⅰ8 and the elastic ring are sleeved on the inner tube 1 to effectively ensure stability.

[0106] The positioning switch includes a positioning pin 6, a positioning hole II4.1.2 matching the positioning pin 6 is provided on the outer tube 4, and a positioning hole III1.4 matching the positioning pin 6 is provided on the inner tube 1. When the positioning pin 6 positions the inner tube 1 and the outer tube 4, one end of the positioning pin 6 is arranged in the positioning hole III1.4, the middle part of the positioning pin 6 is arranged in the positioning hole II4.1.2, and the other end of the positioning pin 6 is arranged outside the outer tube 4. When the inner tube 1 and the outer tube 4 do not need to be positioned, the medical staff can pull the positioning pin 6 out of the positioning hole III1.4 and the positioning hole II4.1.2.

[0107] Or when the positioning pin 6 positions the inner tube 1 and the outer tube 4, one end of the positioning pin 6 is located in the positioning hole II4.1.2, and the other end of the positioning pin 6 is located in the positioning hole III1.4. When the inner tube 1 and the outer tube 4 do not need to be positioned, the positioning pin 6 is completely located in the positioning hole III1.4. When the inner tube 1 and the outer tube 4 do not need to be positioned, the medical staff can push the positioning pin 6 inward through the positioning hole II4.1.2 by wearing a pin on the finger to completely push the positioning pin 6 into the positioning hole III1.4.

[0108] The inner tube 1 is provided with a limit block III1.3, which is slidably matched with the sleeve 4.1. Under the action of the elastic component, the inner tube 1 slides in the sleeve 4.1, and the limit block III1.3 can guide the movement of the inner tube 1 and improve the stability of the inner tube 1 when moving.

[0109] A limiting structure is arranged at the rear end of the sleeve 4.1, and the limiting structure is a limiting plate II10. The limiting plate II10 can prevent the inner tube 1 from slipping out of the outer tube 4.

[0110] The stop block Ⅰ1.1 is connected with a connector 5. The connector 5 is a connecting tube fixedly connected to the rear end of the inner tube 1, and is used to connect the medical needle to the blood collection hose of the blood collector or the infusion hose of the infusion set.

[0111] The lower end surface of the outer tube 4 is a plane, which is convenient for medical staff to fix the needle.

[0112] A handle 4.1.1 is fixedly provided at one end of the sleeve 4.1, and the handle 4.1.1 is provided to facilitate the operation of medical personnel to insert the needle tip 2 into the patient's blood vessel.

[0113] When the medical needle is not in use, a needle cap (not shown in the figure) is placed on the needle tip 2 to protect the needle tip 2 and prevent the needle tip 2 from being contaminated.

[0114] Example 3

[0115] like Fig.17 and Fig.18 As shown, a medical needle comprises an inner tube 1, the front end of the inner tube 1 is fixedly connected to a needle tip 2, a liquid channel I3 is arranged in the inner tube 1, and a liquid channel II9 connected to the liquid channel I3 is arranged in the needle tip 1; an outer tube 4 is sleeved on the inner tube 1, and the outer tube 4 comprises a sleeve 4.1, and a limit block II1.2 is arranged on the inner tube 1, and the limit block II1.2 is fixedly connected to the inner tube 1 or the limit block 1.2 is integrally formed with the inner tube 1, and the sleeve 4.1 is connected to a baffle I7, and the baffle I7 is provided with a limit In front of the positioning block II1.2, an elastic component is arranged between the limit block II1.2 and the baffle I7, and a positioning switch is connected between the inner tube 1 and the outer tube 4. When the positioning switch positions the inner tube 1 and the outer tube 4, the front end of the needle tip 2 is located outside the outer tube 4; when the positioning switch does not position the inner tube 1 and the outer tube 4, under the action of the elastic component, the front end of the needle tip 2 is located inside the outer tube 4; the elastic component is always in a compressed state; the elastic component is a spring I8, and the spring I8 is sleeved on the inner tube 1.

[0116] The baffle plate Ⅰ7 is connected to the middle part of the sleeve 4.1, and the baffle plate Ⅰ7 is fixedly connected to the sleeve 4.1 or the baffle plate Ⅰ7 and the sleeve 4.1 are integrally formed. When the positioning switch positions the inner tube 1 and the outer tube 4, the elastic component is completely arranged at the rear part inside the outer tube 4 or a part of the elastic component is arranged at the rear part inside the outer tube 4 and the other part is arranged outside the outer tube 4.

[0117] The inner tube 1 is provided with a limit block III1.3, the inner tube 1 is fixedly connected to the limit block III1.3, or the inner tube 1 and the limit block III1.3 are integrally formed, the limit block 1.3 is arranged at the front end of the baffle I7, and the limit block II1.2 and / or the limit block III1.3 are slidably matched with the sleeve 4.1.

[0118] A limiting block Ⅰ1.1 is arranged at the rear end of the inner tube 1; the inner tube 1 is fixedly connected to the limiting block Ⅰ1.1, or the inner tube 1 and the limiting block Ⅰ1.1 are integrally formed.

[0119] The rear end of the inner tube 1 is connected with a connector 5. The connector 5 is a connecting tube fixedly connected to the rear end of the inner tube 1, and is used to connect the medical needle to the blood collection hose of the blood collector or the infusion hose of the infusion set.

[0120] The lower end surface of the outer tube 4 is a plane, which is convenient for medical staff to fix the needle.

[0121] A handle 4.1.1 is fixedly provided at one end of the sleeve 4.1, and the handle 4.1.1 is provided to facilitate the operation of medical personnel to insert the needle tip 2 into the patient's blood vessel.

[0122] When the medical needle is not in use, a needle cap (not shown in the figure) is placed on the needle tip 2 to protect the needle tip 2 and prevent the needle tip 2 from being contaminated.

[0123] Example 4

[0124] like Figure 19-22 , the difference between this embodiment and embodiment 1 is that: the front end of the limit structure is provided with a barb structure, the barb structure includes a barb 11, one end of the barb 11 is rotatably connected to the sleeve 4.1, a spring II 12 is connected between the barb 11 and the sleeve 4.1, and the sleeve 4.1 is provided with a groove or through hole for accommodating the barb structure. Under normal conditions, one end of the barb 11 extends into the sleeve 4.1 under the action of the spring II 12. When the inner tube 1 and the outer tube 4 do not need to be positioned, under the action of the spring I8, the inner tube 1 moves backward, and the limit block II 1.2 pushes the barb 11 to compress the spring II 12 until the barb 11 is pressed into the groove or through hole of the sleeve 4.1. When the limit block II 1.2 passes through the barb structure, one end of the barb 11 is reset to the sleeve 4.1 under the action of the spring II 12. Even if the inner tube 1 is pushed forward, the limit block II 1.2 cannot move forward through the barb structure.

[0125] The distance between the limiting structure and the barb structure is greater than or equal to the thickness of the limiting block II1.2. When the inner tube 1 and the outer tube 4 are not limited, the limiting block II1.2 can be limited between the limiting structure and the barb structure, thereby limiting the needle tip 2 in the outer tube 4.

[0126] Example 5

[0127] like Figure 23-26As shown, the difference between this embodiment and embodiment 2 is that: the front end of the limiting structure is provided with a barb structure, the barb structure includes a barb 11, one end of the barb 11 is rotatably connected to the sleeve 4.1, a spring II 12 is connected between the barb 11 and the sleeve 4.1, and the sleeve 4.1 is provided with a groove or through hole for accommodating the barb structure. Under normal conditions, one end of the barb 11 extends into the sleeve 4.1 under the action of the spring II 12. When the inner tube 1 and the outer tube 4 do not need to be positioned, under the action of the spring I 8, the inner tube 1 moves backward, the limiting block III 1.3 pushes the barb and compresses the spring II 12 until the barb 11 is pressed into the groove or through hole of the sleeve 4.1. When the limiting block III 1.3 passes through the barb structure, one end of the barb 1 is reset to the sleeve 4.1 under the action of the spring II 12. Even if the inner tube 1 is pushed forward, the limiting block III 1.3 cannot move forward through the barb structure.

[0128] Preferably, the distance between the limiting structure and the barb structure is greater than or equal to the thickness of the limiting block III1.3. When the inner tube 1 and the outer tube 4 are not limited, the limiting block III1.3 can be limited between the limiting structure and the barb structure, thereby limiting the needle tip 2 in the outer tube 4.

[0129] Example 6

[0130] like Figure 27-30 As shown, the difference between this embodiment and embodiment 3 is that: the front end of the baffle Ⅰ7 is provided with a barb structure, the barb structure includes a barb 11, one end of the barb 11 is rotatably connected to the sleeve 4.1, a spring Ⅱ 12 is connected between the barb 11 and the sleeve 4.1, and the sleeve 4.1 is provided with a groove or through hole for accommodating the barb structure. Under normal conditions, one end of the barb 11 extends into the sleeve 4.1 under the action of the spring Ⅱ 12. When the inner tube 1 and the outer tube 4 do not need to be positioned, under the action of the spring Ⅰ 8, the inner tube 1 moves backward, the limit block Ⅲ 1.3 pushes the barb 11 and compresses the spring Ⅱ 12 until the barb 11 is pressed into the groove or through hole of the sleeve 4.1. When the limit block Ⅲ 1.3 passes through the barb structure, one end of the barb 11 is reset to the sleeve 4.1 under the action of the spring Ⅱ 12. Even if the inner tube 1 is pushed forward, the limit block Ⅲ 1.3 cannot move forward through the barb structure.

[0131] The distance between the baffle plate Ⅰ7 and the barb structure is greater than or equal to the thickness of the stopper III1.3. When the inner tube 1 and the outer tube 4 are not limited, the stopper III1.3 can be limited between the baffle plate Ⅰ7 and the barb structure, thereby limiting the needle tip 2 in the outer tube 4.

[0132] Example 7

[0133] like Fig.31As shown, the difference between this embodiment and embodiment 1 is that the needle tip 2 penetrates the inner tube 1 , and the liquid channel II 9 in the needle tip 2 is connected to the connecting piece 5 .

[0134] Example 8

[0135] like Fig.32 As shown, the difference between this embodiment and embodiment 2 is that the needle tip 2 penetrates the inner tube 1 , and the liquid channel II 9 in the needle tip 2 is connected to the connecting piece 5 .

[0136] Example 9

[0137] like Fig.33 As shown, the difference between this embodiment and embodiment 3 is that the needle tip 2 penetrates the inner tube 1 , and the liquid channel II 9 in the needle tip 2 is connected to the connecting piece 5 .

[0138] Example 10

[0139] The medical needle can be used on a blood sampling set and an infusion set.

[0140] Embodiment 11

[0141] A method for using a medical needle comprises the following steps:

[0142] (1) The positioning switch positions the inner tube 1 and the outer tube 4 (this is the initial state of the medical needle), the needle tip 2 is located at the front end of the outer tube 4, and the medical staff inserts the needle tip 2 into the patient's blood vessel; when blood is collected, the blood enters the liquid channel I3 through the liquid channel II9, and the liquid channel I3 is connected to the blood collection tube through the connector 5; when infusion, the liquid in the infusion tube enters the liquid channel I3 through the connector 5, and then enters the liquid channel II9 from the liquid channel I3, and the liquid enters the patient's blood vessel from the liquid channel II9;

[0143] (2) After completing the blood sampling or infusion operation, the medical staff first withdraws the needle tip 2 from the patient's blood vessel, and then presses the outer tube 4 to control the positioning switch so that the inner tube 1 and the outer tube 4 are dislocated, and the needle tip 2 enters the outer tube 4 under the action of the elastic component; or the medical staff presses the outer tube 4 to control the positioning switch so that the inner tube 1 and the outer tube 4 are dislocated, and the needle tip 2 is automatically withdrawn from the patient's blood vessel and enters the outer tube 4 under the action of the elastic component.

[0144] Technical features not described in the present invention can be achieved by or by using existing technologies and will not be described in detail herein. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above implementation modes. Changes, modifications, additions or substitutions made by ordinary technicians in this field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A medical needle, comprising an inner tube (1), the inner tube (1) being fixedly connected to a needle tip (2), the needle tip (2) being provided with a liquid channel II (9); wherein: The inner tube (1) is sleeved with an outer tube (4), the outer tube (4) comprising a sleeve (4.1), a limit block II (1.2) is provided on the inner tube (1), the sleeve (4.1) is connected to a baffle I (7), the baffle I (7) is provided in front of the limit block II (1.2), an elastic component is provided between the limit block II (1.2) and the baffle I (7), a positioning switch is connected between the inner tube (1) and the outer tube (4), and when the positioning switch positions the inner tube (1) and the outer tube (4), the needle tip The front end of the needle tip (2) is located outside the outer tube (4); when the positioning switch does not position the inner tube (1) and the outer tube (4), under the action of the elastic component, the front end of the needle tip (2) is located inside the outer tube (4); the needle tip (2) penetrates the inner tube (1), or the inner tube (1) is provided with a liquid channel I (3) connected to the liquid channel II (9); the elastic component is always in a compressed state; the elastic component is a spring I (8) or an elastic ring, and the spring I (8) or the elastic ring is sleeved on the inner tube (1); The positioning switch comprises a positioning pin (6); the sleeve (4.1) is provided with a positioning hole II (4.1.2) matching the positioning pin (6); the inner tube (1) is provided with a positioning hole I (1.2.1) matching the positioning pin (6); the positioning hole I (1.2.1) is provided on a limit block II (1.2) or a limit block III (1.3); when the positioning pin (6) positions the inner tube (1) and the outer tube (4), one end of the positioning pin (6) is provided in the positioning hole I (1.2.1), and the middle part of the positioning pin (6) is provided in the positioning hole II (4.1.2); The other end of the positioning pin (6) is arranged outside the outer tube (4); when the inner tube (1) and the outer tube (4) do not need to be positioned, the positioning pin (6) is pulled out from the positioning hole I (1.2.1) and the positioning hole II (4.1.2); or when the positioning pin (6) positions the inner tube (1) and the outer tube (4), one end of the positioning pin (6) is located in the positioning hole II (4.1.2) and the other end of the positioning pin (6) is located in the positioning hole I (1.2.1); when the inner tube (1) and the outer tube (4) do not need to be positioned, the positioning pin (6) is completely located in the positioning hole I (1.2.1).

2. The medical needle according to claim 1, characterized in that: The baffle plate I (7) is connected to the front part of the sleeve (4.1), and when the positioning switch positions the inner tube (1) and the outer tube (4), the elastic component is arranged at the front part inside the outer tube (4); or the baffle plate I (7) is connected to the middle part of the sleeve (4.1), and when the positioning switch positions the inner tube (1) and the outer tube (4), the elastic component is arranged entirely at the rear part inside the outer tube (4) or a part of the elastic component is arranged at the rear part inside the outer tube (4) and the other part is arranged outside the outer tube (4).

3. The medical needle according to claim 1 or 2, characterized in that: The limit block II (1.2) is slidably matched with the sleeve (4.1); the rear end of the sleeve (4.1) is connected to a limit structure, and the limit structure is a limit protrusion (4.1.3) arranged on the inner wall of the sleeve (4.1) or a limit plate fixedly connected to the rear end of the outer tube (4); a barb structure is arranged at the front end of the limit structure, and the barb structure includes a barb (11); one end of the barb (11) is rotatably connected to the sleeve (4.1); a spring II (12) is connected between the barb (11) and the sleeve (4.1); and a groove or a through hole for accommodating the barb structure is arranged on the sleeve (4.1); the distance between the limit structure and the barb structure is greater than or equal to the thickness of the limit block II (1.2); or a limit block III (1.3) is arranged on the inner tube (1), and the limit block III (1.3) is arranged at the front end of the baffle I (7); Block II (1.2) and / or limit block III (1.3) are slidably matched with the sleeve (4.1); a barb structure is provided at the front end of the baffle I (7), the barb structure comprises a barb (11), one end of the barb (11) is rotatably connected to the sleeve (4.1), a spring II (12) is connected between the barb (11) and the sleeve (4.1), and a groove or a through hole for accommodating the barb structure is provided on the sleeve (4.1); the distance between the baffle I (7) and the barb structure is greater than or equal to the thickness of the limit block III (1.3); a limit block I (1.1) is provided at the rear end of the inner tube (1); a connecting piece (5) is connected to the rear end of the inner tube (1); the lower end surface of the outer tube (4) is a plane; a handle (4.1.1) is fixedly provided at one end of the sleeve (4.1); when the medical needle is not in use, a needle cap is provided on the needle tip (2).

4. A medical needle, comprising an inner tube (1), the inner tube (1) being fixedly connected to a needle tip (2), the needle tip (2) being provided with a liquid channel II (9); wherein: The inner tube (1) is sleeved with an outer tube (4), a limit block I (1.1) is provided at the rear of the inner tube (1), an elastic component is provided between the rear end of the outer tube (4) and the limit block I (1.1), the elastic component is provided outside the outer tube (4), a positioning switch is connected between the inner tube (1) and the outer tube (4), when the positioning switch positions the inner tube (1) and the outer tube (4), the front end of the needle tip (2) is located outside the outer tube (4), and when the positioning switch does not position the inner tube (1) and the outer tube (4), under the action of the elastic component, the front end of the needle tip (2) is located inside the outer tube (4); the needle tip (2) penetrates the inner tube (1), or a liquid channel I (3) connected to the liquid channel II (9) is provided in the inner tube (1); the elastic component is always in a compressed state; The positioning switch comprises a positioning pin (6); a positioning hole II (4.1.2) matching the positioning pin (6) is provided on the outer tube (4); and a positioning hole III (1.4) matching the positioning pin (6) is provided on the inner tube (1); when the positioning pin (6) positions the inner tube (1) and the outer tube (4), one end of the positioning pin (6) is arranged in the positioning hole III (1.4), the middle part of the positioning pin (6) is arranged in the positioning hole II (4.1.2), and the other end of the positioning pin (6) is arranged in the outer tube (4 ), when the inner tube (1) and the outer tube (4) do not need to be positioned, the positioning pin (6) is pulled out from the positioning hole III (1.4) and the positioning hole II (4.1.2); or when the positioning pin (6) positions the inner tube (1) and the outer tube (4), one end of the positioning pin (6) is located in the positioning hole II (4.1.2) and the other end of the positioning pin (6) is located in the positioning hole III (1.4); when the inner tube (1) and the outer tube (4) do not need to be positioned, the positioning pin (6) is completely located in the positioning hole III (1.4).

5. The medical needle according to claim 4, characterized in that: The elastic component is a spring I (8) or an elastic ring, and the spring I (8) or the elastic ring is sleeved on the inner tube (1).

6. The medical needle according to claim 4 or 5, characterized in that: A limit block III (1.3) is provided on the inner tube (1), and the limit block III (1.3) can be slidably matched with the sleeve (4.1); a limit structure is provided at the rear end of the sleeve (4.1), and the limit structure is a limit protrusion (4.1.3) provided on the inner wall of the sleeve (4.1), or the limit structure is a baffle II (10) connected to the rear end of the sleeve (4.1); The elastic component is arranged between the baffle II (10) and the limiting block I (1.1); a barb structure is arranged at the front end of the limiting structure, the barb structure comprises a barb (11), one end of the barb (11) is rotatably connected to the sleeve (4.1), a spring II (12) is connected between the barb (11) and the sleeve (4.1), and a groove or a through hole for accommodating the barb structure is arranged on the sleeve (4.1); the distance between the limiting structure and the barb structure is greater than or equal to the thickness of the limiting block III (1.3); the limiting block I (1.1) is connected to a connecting piece (5); the lower end surface of the outer tube (4) is a plane; a handle (4.1.1) is fixedly arranged at one end of the sleeve (4.1); when the medical needle is not in use, a needle cap is sleeved on the needle tip (2).

7. A blood collection device and an infusion set made using the medical needle according to any one of claims 1 to 6.

8. A method for using the medical needle according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) The positioning switch positions the inner tube (1) and the outer tube (4), the needle tip (2) is located at the front end of the outer tube (4), and the medical staff inserts the needle tip (2) into the patient's blood vessel; (2) after completing the blood sampling or infusion operation, the medical staff first withdraws the needle tip (2) from the patient's blood vessel, and then presses the outer tube (4) to control the positioning switch so that the inner tube (1) and the outer tube (4) are separated from each other, and the needle tip (2) enters the interior of the outer tube (4) under the action of the elastic component; or the medical staff presses the outer tube (4) to control the positioning switch so that the inner tube (1) and the outer tube (4) are separated from each other, and the needle tip (2) is automatically withdrawn from the patient's blood vessel and enters the interior of the outer tube (4) under the action of the elastic component.

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