A miniature, painless, safe blood collection needle

Abstract

The present invention discloses a micro-painless safety blood collection needle, comprising: a needle body, an excitation sleeve, an outer shell and a spring, wherein the excitation sleeve is arranged inside the outer shell, the needle body is arranged inside the excitation sleeve, the outer shell, the excitation sleeve and the needle body are all slidably connected, the excitation sleeve is arranged with an inner wall, the inner side of the middle part of the inner wall is arranged with an unlocking arm, the outer side of the bottom is arranged with a buckle, the front end of the needle body is arranged with a needle cap, the unlocking arm of the excitation sleeve is respectively engaged with the self-locking boss of the needle cap and the undercut of the outer shell, the spring is arranged between the bottom of the needle body and the outer shell, the bottom of the outer shell is arranged with a guide platform, and the top of the guide platform abuts against the inner side of the bevel. The present invention prevents the cap from being crooked and eliminates the phenomenon of mis-excitation, and accurately controls the needle insertion depth, thereby reducing the pain of blood collection.

Description

Technical Field

[0001] The invention relates to the technical field of medical supplies, and in particular to a miniature, minimally painful, safe blood collection needle. Background Art

[0002] In the scheme adopted by the existing blood collection needles, the needle body is generally rotated to the firing position by pressing the excitation sleeve. In this case, the excitation sleeve only moves axially in the outer shell of the blood collection needle. However, because one end of the spring is connected to the needle body and the other end is not connected to the bottom cover of the blood collection needle with relative displacement, the rotation of the needle body will cause the spring to twist, and the spring will be damaged as it twists and strikes, thereby affecting the strength of the spring strike. The blood collection needle also needs to prevent accidental firing. In order to prevent accidental firing, a cap device is provided on the blood collection needle to cover the inner sleeve that triggers the blood collection operation. The cap device on the market is composed of two components, which has many components and a complex structure, which also increases the manufacturing cost and causes a waste of resources.

[0003] In addition, the insertion depth of the blood collection needle is controlled by the free expansion and contraction of the spring, which may result in a slight error and increase the pain. The blood collection needle is prone to tilting during assembly and transportation, causing the needle tip and the needle body to tilt, and increasing the pain of the user. Summary of the invention

[0004] The purpose of the present invention is to provide a miniature, minimally painful, safe blood collection needle.

[0005] To achieve the above object, the present invention adopts the following contents:

[0006] A micro-painless safety blood collection needle comprises: a needle body, an excitation sleeve, an outer shell and a spring, wherein the excitation sleeve is arranged in the outer shell, the needle body is arranged in the excitation sleeve, the outer shell, the excitation sleeve and the needle body are all slidably connected, the outer shell is provided with an undercut, the excitation sleeve is provided with an inner wall, the inner side of the middle part of the inner wall is provided with an unlocking arm, and the outer side of the bottom is provided with a buckle, the front end of the needle body is provided with a needle cap, the needle cap is provided with a self-locking boss, the unlocking arm of the excitation sleeve is respectively engaged with the self-locking boss of the needle cap and the undercut of the outer shell, so as to fix the position between the needle body, the excitation sleeve and the outer shell, the spring is arranged between the bottom of the needle body and the outer shell, the bottom of the outer shell is provided with a guide platform, the excitation sleeve is provided with an oblique angle, the top of the guide platform abuts against the inner side of the oblique angle, and when the excitation sleeve is pressed, the inner wall is opened to both sides through the top of the guide platform, so that the needle body makes axial movement through the clamping position of the inner wall under the action of the spring.

[0007] Preferably, limiting steps and locking steps are provided on both sides of the needle body, a guide port adapted to the limiting step and locking step is provided at the rear of the excitation sleeve, a guide groove adapted to the limiting step and locking step is provided in the outer shell, and the limiting step, locking step, guide port and guide groove are in the same direction.

[0008] Preferably, an upper plane matched with the limiting step is provided on the unlocking arm, and the upper plane of the unlocking arm limits the needle body from continuing to make axial movement, thereby controlling the insertion depth of the needle body.

[0009] Preferably, a slide groove is provided in the outer shell, and a guide rail matched with the slide groove is provided on the outer side of the inner wall.

[0010] Preferably, a needle core is pre-buried in the needle body.

[0011] Preferably, a guide platform is provided on the bottom side wall of the housing, and the guide platform abuts against two sides of the spring to guide the extension and contraction direction of the spring and lock the left and right movable amount of the spring at the same time.

[0012] Preferably, a round platform is provided at the bottom of the shell, one end of the spring is sleeved on the bottom of the needle body and passes over the protrusion, and the other end is sleeved on the round platform of the shell.

[0013] Preferably, it further comprises a protective cap, which is sleeved on the needle cap and is engaged with the needle cap.

[0014] The present invention has the following advantages:

[0015] 1) The insertion depth of the needle core in the needle body is achieved by the cooperation between the limiting step of the needle body and the plane of the excitation sleeve, which ensures the precise positioning of the insertion depth, thereby reducing the pain of blood collection;

[0016] 2) The prevention of the crooked cap phenomenon is achieved by the cooperation between the needle cap and the inner wall of the excitation sleeve, which prevents the occurrence of the crooked cap phenomenon without adding additional components, reducing assembly links and reducing costs;

[0017] 3) The occurrence of false triggering is prevented by the cooperation between the self-locking boss of the needle cap and the unlocking arm of the trigger sleeve, which has a simple structure, reduces unnecessary waste of resources, and will not cause false triggering;

[0018] 4) When using the protective cap, the needle cap can be easily separated from the needle body by rotating the protective cap, and the occurrence of crooked cap and misfire can be prevented for a second time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0020] Figure 1It is a schematic diagram of the overall structure of a miniature, minimally painful, safe blood collection needle of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall structure of a miniature, minimally painful, safe blood collection needle of the present invention;

[0022] Figure 3 yes Figure 2 Section along line FF;

[0023] Figure 4 It is a schematic diagram of the overall structure of a miniature, minimally painful, safe blood collection needle of the present invention;

[0024] Figure 5 yes Figure 4 The cross section along the JJ line;

[0025] Figure 6 It is a schematic structural diagram of a needle body in a miniature, minimally painful, safe blood collection needle of the present invention;

[0026] Figure 7 It is a schematic structural diagram of a needle body in a miniature, minimally painful, safe blood collection needle of the present invention;

[0027] Figure 8 It is a structural schematic diagram of an excitation sleeve in a miniature, minimally painful, safe blood collection needle of the present invention;

[0028] Fig. 9 It is a structural schematic diagram of an excitation sleeve in a miniature, minimally painful, safe blood collection needle of the present invention;

[0029] Fig.10 yes Fig. 9 Section along line FF;

[0030] Fig.11 It is a structural schematic diagram of an excitation sleeve in a miniature, minimally painful, safe blood collection needle of the present invention;

[0031] Fig.12 yes Fig.11 Section along line GG;

[0032] Fig.13 It is a schematic structural diagram of a shell of a miniature, minimally painful, safe blood collection needle of the present invention;

[0033] Fig.14 yes Fig.13 Section along line GG;

[0034] Fig.15 It is a schematic structural diagram of a shell of a miniature, minimally painful, safe blood collection needle of the present invention;

[0035] Fig.16 yes Fig.15 Section along line FF;

[0036] Fig.17 It is a schematic structural diagram of a shell of a miniature, minimally painful, safe blood collection needle of the present invention;

[0037] Fig.18 It is a schematic structural diagram of a shell of a miniature, minimally painful, safe blood collection needle of the present invention;

[0038] Fig.19 It is a structural schematic diagram of a protective cap in a miniature, minimally painful, safe blood collection needle of the present invention;

[0039] Fig. 20 It is a structural schematic diagram of a protective cap in a miniature, minimally painful, safe blood collection needle of the present invention;

[0040] Fig.21 It is a structural schematic diagram of a protective cap in a miniature, minimally painful, safe blood collection needle of the present invention;

[0041] Fig. 22 yes Fig.21 Section along line HH;

[0042] Fig.23 This is a schematic diagram of the overall structure of a miniature, minimally painful, safe blood collection needle in Embodiment 2;

[0043] Fig.24 This is a schematic diagram of the structure of a needle body in a miniature, minimally painful, safe blood collection needle in Embodiment 2.

[0044] In the figure, each reference numeral is:

[0045] 1. Needle body; 11. Needle cap; 12. Self-locking boss; 13. Limiting step; 14. Locking step; 15. Fixing buckle; 16. Through hole; 17. Tail of needle body; 18. Protrusion; 2. Trigger sleeve; 21. Inner wall; 22. Unlocking arm; 23. Inner hole; 24. Guide port; 25. Positioning; 26. Buckle; 27. Guide rail; 28. Bevel; 3. Shell; 31. Guide groove; 32. Slide groove; 33. Undercut; 34. Groove; 35. Round table; 36. Guide table; 37. Transition surface; 4. Needle core; 5. Spring; 6. Protective cap; 61. Inner circular hole; 62. Inner flat hole; 63. Through hole. DETAILED DESCRIPTION

[0046] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Embodiment 1

[0050] like Figures 1 to 5 As shown, the present invention is a miniature, minimally painful, safe blood collection needle, comprising: a needle body 1, an excitation sleeve 2, a shell 3, a spring 4 and a protective cap 6, wherein the shell 3 houses the needle body 1, the excitation sleeve 2 and the spring 5; one end of the spring 5 is mounted on the tail 17 of the needle body, and the other end is mounted on the bottom of the shell 3.

[0051] like Figures 19 to 22 As shown, the front end of the protective cap 6 is provided with an inner circular hole 61 , the rear end is provided with an inner flat hole 62 , and the inner flat hole 62 is provided with a through hole 63 .

[0052] like Figure 3 , 6 As shown in , 7, the needle body 1 has a needle cap 11 at the front end, a through hole 16 is provided on the needle cap 11, and fixing buckles 15 are provided on both sides of the through hole 16. The fixing buckles 15 are engaged in the through hole 63 of the protective cap 6, so that the protective cap 6 and the needle cap 11 are assembled together. When in use, the protective cap 6 is rotated to separate the needle cap 11 from the needle body 1.

[0053] The needle cap 11 is provided with a self-locking boss 12 , the needle body 1 is provided with limiting steps 13 on both sides, the needle body is provided with locking steps 14 on both sides, and the rear end is provided with a needle body tail 17 , and the tail 17 is provided with a protrusion 18 .

[0054] like Figures 8 to 12 As shown, the excitation sleeve 2 has guide rails 27 on both outer sides, a buckle 26 on the outer bottom, an inner wall 21 on the inner side, an unlocking arm 22 on the inner wall 21, a guide opening 24 above the unlocking arm 22, locking positions 25 on both sides of the guide opening 24, bevel angles 28 on both sides of the tail of the guide opening 24, and an inner hole 23 on the inner wall 21.

[0055] like Figures 13 to 18 As shown, the shell 3 has an open front end, guide grooves 31 on both sides of the inner wall of the front end, slide grooves 32 on the sides of the guide grooves 31, undercuts 33 on both sides of the shell 3, transition surfaces 37 on the undercuts 33, grooves 34 on the transition surfaces 37, guide platforms 36 on both sides of the bottom of the shell 3, and a round table 35 on the bottom of the shell 3.

[0056] like Figure 3 , 5 As shown, the trigger sleeve tail buckle 26 is located on the upper part of the inner undercut 33 of the shell, a transition surface 37 is provided on the upper part of the buckle 26, a groove 34 is provided on the upper part of the transition surface 37, guide openings 24 are provided on both sides of the trigger sleeve, a clamping position 25 is provided at the tail of the guide opening 24, and the needle body locking step 14 is located above the clamping position 25, together forming a trigger structure of the needle body 1, the principle of which is that the needle body 1 and the trigger sleeve 2 are slidably matched, when the needle body 1 is installed in the trigger sleeve 2, the needle body 1 limits the trigger sleeve 2 to shrink inward, at this time the outer side of the trigger sleeve tail buckle 26 is in contact with the outer The transition surface 37 on the inner side of the shell slides together to prevent the excitation sleeve 2 from expanding outward. At the same time, the outer side of the buckle 26 at the tail of the excitation sleeve is larger than the undercut 33 on the inner side of the shell, so that the excitation sleeve 2 is connected to the shell 3. Only when the buckle 26 at the tail of the excitation sleeve passes over the transition surface 37 and reaches the groove 34, the excitation sleeve 2 can expand outward and the needle body 1 can be excited. In order to ensure the smooth excitation of the needle body 1, a guide port 24 is provided at the rear of the excitation sleeve, and there are bevels 28 on both sides of the tail of the guide port 24. The guide platform 36 on the inner side of the shell allows the excitation sleeve 2 to expand outward smoothly.

[0057] The outer side of the needle cap 11 is slidably matched with the inner hole 23 of the excitation sleeve to prevent the needle cap from shifting and becoming crooked; the spring 5 is slidably matched with the guide platform 36 of the housing to reduce the radial movement of the spring and reduce the loss of the spring;

[0058] A self-locking boss 12 is provided on the needle cap 11, and an unlocking arm 22 located on the excitation sleeve 2 is provided on the upper part of the self-locking boss 12, and the two cooperate to prevent the needle body 1 from being accidentally excited; the limiting step 13, the locking step 14, the guide port 24, and the guide groove 31 are located in the same direction, forming an axial track of the needle body 1 to reduce the shaking of the needle core 4 in the needle body 1 and reduce the pain of the user; the limiting step 13 of the needle body 1 cooperates with the upper plane of the unlocking arm 22 to stabilize the blood collection depth of the needle core 4 in the needle body 1.

[0059] Assembly process:

[0060] First, put one end of the spring 5 on the needle body tail 17 of the needle body 1 until one end of the spring 5 passes over the protrusion 18 and is stuck;

[0061] Then, the limiting steps 13 on both sides of the needle body 1 are installed along the guide openings 24 on both sides of the excitation sleeve 2. At this time, the other end of the spring 5 is sleeved on the round table of the shell, which effectively prevents the spring from moving during the excitation process.

[0062] Next, the guide rail 27 of the excitation sleeve 2 is installed along the slideway groove 32 of the housing 3, and the excitation sleeve 2 stops when the buckle 26 passes over the undercut 33 of the housing 3;

[0063] Finally, the needle cap 11 is inserted along the inner circular hole 61 and the inner flat hole 62 of the protective cap 6 until the fixing buckle 15 is inserted into the through hole 63 , so that the needle cap 11 is combined with the protective cap 6 .

[0064] Working principle:

[0065] The protective cap 6 is rotated, and the needle cap 11 is separated from the needle body 1 while rotating. At this time, the front end of the excitation sleeve 2 is pressed to make the spring 5 enter the pre-stressed state. The bevel 28 of the excitation sleeve 2 is gradually stretched open by the bevel on the top of the guide platform 36 of the shell 3. At this time, the locking step 14 on the needle body 1 can pass through the excitation sleeve position 25. Because the spring 5 is in a compressed state, the needle body 1 moves axially along the excitation sleeve 2 under the elastic action of the spring 5. The spring 4 will enter the stretched state under the action of inertia until the limit on the needle body 1 is released. The step 13 contacts the upper plane of the unlocking arm 22 of the excitation sleeve, limiting the needle body 1 from continuing to make axial movement outward toward the opening of the shell 3, thereby ending the stretching of the spring 5 and controlling the insertion depth of the needle core 4. At this time, the needle core 4 built into the needle body 1 will be exposed from the front end of the excitation sleeve. At this time, the performance of the spring 5 obtained by compression disappears, and the spring 5 enters a retracted state caused by stretching, until the spring 5 recovers its free length, the needle body 1 is completely retracted into the excitation sleeve 2, and the needle core 4 built into the needle body 1 is also completely within the excitation sleeve.

[0066] Embodiment 2

[0067] like Fig.23 , 24 As shown, the internal structure of the capless miniature slightly painful safety blood collection needle of the second embodiment is the same as that of the protective cap-type miniature slightly painful safety blood collection needle of the first embodiment, except that the front end of the needle cap 11 lacks the protective cap 6, and is composed of the needle body 1, the excitation sleeve 2, the shell 3 and the spring 5. The front end of the needle body 1 is provided with a needle cap 11, and there is no through hole 16 and the fixing buckle 15 on the needle cap 11, which reduces the cost and waste, and has the same use effect as the protective cap type. When in use, the needle cap 11 is rotated to separate the main body of the needle body 1 from the needle cap 11.

[0068] Obviously, the embodiments of the present invention are miniature, minimally painful, safe blood collection needles. The above embodiments are merely examples for clearly illustrating the present invention, and are not limitations on the embodiments of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the embodiments here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A miniature, painless, safe blood collection needle, characterized in that: include: A needle body, an excitation sleeve, an outer shell and a spring, wherein the excitation sleeve is arranged inside the outer shell, and the needle body is arranged inside the excitation sleeve, and the outer shell, the excitation sleeve and the needle body are all slidably connected, the outer shell is provided with an undercut, the excitation sleeve is provided with an inner wall, an unlocking arm is arranged on the inner side of the middle part of the inner wall, and a buckle is arranged on the outer side of the bottom, a needle cap is arranged at the front end of the needle body, a self-locking boss is arranged on the needle cap, and the unlocking arm of the excitation sleeve is respectively engaged with the self-locking boss of the needle cap and the undercut of the outer shell, so as to fix the position between the needle body, the excitation sleeve and the outer shell, a transition surface is arranged on the undercut, and a groove is arranged on the transition surface, and the spring is arranged on the needle body. Between the bottom and the shell, a guide platform is provided at the bottom of the shell, and an bevel is provided on the excitation sleeve, and the top of the guide platform abuts the inner side of the bevel. When the excitation sleeve is pressed, the inner wall is opened to both sides through the top of the guide platform, so that the needle body makes axial movement through the clamping position of the inner wall under the action of the spring, and limiting steps and locking steps are provided on both sides of the needle body, and a guide port matched with the limiting step and the locking step is provided at the rear of the excitation sleeve, and a guide groove matched with the limiting step and the locking step is provided in the shell, and the limiting step, the locking step, the guide port and the guide groove are in the same direction.

2. A miniature, minimally painful, safe blood collection needle according to claim 1, characterized in that: The unlocking arm is provided with an upper plane matched with the limiting step, and the upper plane of the unlocking arm limits the needle body from continuing to make axial movement, thereby controlling the insertion depth of the needle body.

3. The miniature, minimally painful, safe blood collection needle according to claim 1, characterized in that: A slideway groove is arranged in the shell, and a guide rail matched with the slideway groove is arranged on the outer side of the inner wall.

4. The miniature, minimally painful, safe blood collection needle according to claim 1, characterized in that: A needle core is pre-buried in the needle body.

5. The miniature, minimally painful, safe blood collection needle according to claim 1, characterized in that: A guide platform is arranged on the bottom side wall of the shell, and the guide platform abuts against two sides of the spring to guide the extension and contraction direction of the spring and lock the left and right movable amount of the spring at the same time.

6. The miniature, minimally painful, safe blood collection needle according to claim 1, characterized in that: A round platform is arranged at the bottom of the shell, one end of the spring is sleeved on the bottom of the needle body and goes over the protrusion, and the other end is sleeved on the round platform of the shell.

7. A miniature, minimally painful, safe blood collection needle according to any one of claims 1 to 6, characterized in that: It also comprises a protection cap, which is sleeved on the needle cap and is clamped with the needle cap.

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