This application is based upon and claims priority to Chinese Patent Application No. 202011458920.X, filed on Dec. 11, 2020, the entire contents of which are incorporated herein by reference.
The present invention relates to the technical field of medical supplies, and more particularly, to a miniature safety blood lancet for minimizing pain.
To use a typical blood lancet, the activation sleeve is generally pressed so that the needle body rotates to the launching position. In this case, the activation sleeve only moves axially within the housing of the blood lancet. However, since one end of the spring is connected to the needle body and the other end of the spring is connected to the bottom cap of the blood lancet without relative displacement, the rotation of the needle body will drive the spring to twist. As a result, the spring bounces while twisting, which impairs its potential energy, thereby affecting its bouncing force. Moreover, it is necessary to prevent the blood lancet from being unintentionally launched. In this regard, a cap device is arranged on the blood lancet to cover the inner sleeve that is capable of triggering a blood sampling operation. A cap device available on the market includes an excess of two components and thus has a complex structure, which not only increases its production cost but also causes waste of resources.
Additionally, the penetration depth of the blood lancet typically has some errors as it is controlled by the spring capable of being freely stretched and compressed, which may increase the pain. In the process of assembling and transporting the blood lancet, the cap is prone to be crooked, causing the needle tip and the needle body to tilt or bend, thereby increasing the pain of the user.
An objective of the present invention is to provide a miniature safety blood lancet for minimizing pain.
To achieve the above-mentioned objective, the present invention employs the following technical solutions.
A miniature safety blood lancet for minimizing pain includes: a needle body, an activation sleeve, a housing and a spring. The activation sleeve is arranged in the housing. The needle body is arranged in the activation sleeve. The housing, the activation sleeve and the needle body are slidably connected. The housing is provided with an inverted buckle. The activation sleeve is provided with an inner wall. The inner side of the middle of the inner wall is provided with an unlocking arm. The outer side of the bottom of the inner wall is provided with a buckle. A needle cap is arranged at the front end of the needle body. The needle cap is provided with a self-locking protrusion. The unlocking arm of the activation sleeve is snap-fitted with the self-locking protrusion of the needle cap and the inverted buckle of the housing, respectively, to fix the positional relationship between the needle body, the activation sleeve and the housing. The spring is arranged between the bottom of the needle body and the housing. A guide table is arranged at the bottom of the housing. The activation sleeve is provided with a bevel. The top of the guide table abuts the inner side of the bevel. When the activation sleeve is pressed, the top of the guide table expands the inner wall towards both sides, so that the needle body moves axially to pass through a clamping position of the inner wall under the force of the spring.
Preferably, both sides of the needle body are provided with limiting steps and latching steps. The rear of the activation sleeve is provided with a guide port matched with the limiting steps and the latching steps. A guide groove matched with the limiting steps and the latching steps is arranged within the housing. The limiting steps, the latching steps, the guide port, and the guide groove are located in the same direction.
Preferably, the unlocking arm is provided with an upper plane matched with the limiting steps, and the upper plane of the unlocking arm restricts the needle body from continuing to move axially to control the penetration depth of the needle body.
Preferably, a slide groove is arranged within the housing, and the outer side of the inner wall is provided with a guide rail matched with the slide groove.
Preferably, a needle core is pre-embedded in the needle body.
Preferably, the guide table is arranged on the bottom side wall of the housing. The guide table abuts both sides of the spring to guide the direction in which the spring is stretched and compressed and restrict a lateral movement of the spring.
Preferably, a truncated cone is arranged at the bottom of the housing. One end of the spring is sleeved on the bottom of the needle body and passes over a protrusion.
The other end of the spring is sleeved on the truncated cone of the housing.
Preferably, the miniature safety blood lancet for minimizing pain further includes a protective cap. The protective cap is sleeved on the needle cap, and is snap-fitted with the needle cap.
The present invention has the following advantages.
1) The penetration depth of the needle core of the needle body is controlled by the limiting steps of the needle body matched with the plane of the activation sleeve, thereby precisely positioning the penetration depth to reduce the pain during blood sampling.
2) The needle cap is fitted with the inner wall of the activation sleeve to prevent the cap from being crooked without introducing extra components, thereby eliminating the assembly process and reducing the cost.
3) The self-locking protrusion of the needle cap is fitted with the unlocking arm of the activation sleeve to prevent unintentional activation. The need body has a simple structure to reduce unnecessary waste of resources and is prevented from being unintentionally activated.
4) When the protective cap is in use, the needle cap can be separated from the needle body conveniently by rotating the protective cap, which further prevents the cap from being crooked and prevents unintentional activation.
The specific embodiments of the present invention will be described in more detail below with reference to the drawings.
In the figures:
1. needle body; 11. needle cap; 12. self-locking protrusion; 13. limiting step; 14. latching step; 15. fixing buckle; 16. through hole; 17. tail part of the needle body; 18. protrusion; 2. activation sleeve; 21. inner wall; 22. unlocking arm; 23. inner hole; 24. guide port; 25. clamping position; 26. buckle; 27. guide rail; 28. bevel; 3. housing; 31. guide groove; 32. slide groove; 33. inverted buckle; 34. groove; 35. truncated cone; 36. guide table; 37. transition surface; 4. needle core; 5. spring; 6. protective cap; 61. inner circular hole; 62. inner flat hole; and 63. through hole.
For illustrating the present invention more clearly, the present invention will be further described in combination with the preferred embodiments. It should be understood by those skilled in the art that the details described below are illustrative rather than restrictive and shall not be construed as limiting the scope of protection of the present invention.
In the description of the present invention, it should be understood that the orientation or positional relations indicated by the terms such as “central”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner/inside”, and “outer/outside” are the orientation or positional relations as shown in the drawings only for ease of describing the present invention and simplifying the description, rather than indicating or implying that the indicated devices or elements must have the particular orientation, or be constructed and operated in that particular orientation, and thus cannot be construed as a limitation to the present invention.
In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms such as “install/mount”, “connected to” and “connection” should be understood in a broad sense. For example, a connection may be a fixed, or may be a detachable connection, or may be an integral connection; it may be a direct connection, or may be an indirect connection through an intermediate, or may be an internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific situations.
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The needle cap 11 is provided with the self-locking protrusion 12. Both sides of the needle body 1 are provided with the limiting steps 13 and the latching steps 14. The rear end of the needle body 1 is provided with the tail part 17. The protrusion 18 is arranged on the bottom circumferential wall of the needle body 1.
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The outer side of the needle cap 11 is slidably fitted with the inner hole 23 of the activation sleeve to prevent the needle cap from displacing and being crooked. The spring 5 is slidably fitted with the guide table 36 of the housing to restrict the radial movement of the spring, thereby reducing the loss of the spring.
The needle cap 11 is provided with the self-locking protrusion 12. The upper part of the self-locking protrusion 12 is provided with the unlocking arm 22 that is located on the activation sleeve 2. The self-locking protrusion 12 and the unlocking arm 22 are fitted with each other to prevent the needle body 1 from being unintentionally activated. The limiting steps 13, the latching steps 14, the guide port 24, and the guide groove 31 are located in the same direction to constitute an axial rail for the needle body 1, so as to prevent the needle core 4 in the needle body 1 from shaking, thereby reducing the pain of the user. The limiting steps 13 of the needle body 1 are fitted with the upper plane of the unlocking arm 22 to control the penetration depth of the needle core 4 in the needle body 1.
Assembly Process:
Firstly, an end of the spring 5 is sleeved on the tail part 17 of the needle body 1, until the end of the spring 5 passes over the protrusion 18 and is hooked to the protrusion 18.
Then, the limiting steps 13 on both sides of the needle body 1 are mounted along the guide port 24 on both sides of the activation sleeve 2. At this moment, the other end of the spring 5 is sleeved on the truncated cone of the housing to effectively prevent the displacement of the spring during activation.
After that, the guide rail 27 of the activation sleeve 2 is mounted along the slide groove 32 of the housing 3, until the buckle 26 of the activation sleeve 2 passes over the inverted buckle 33 of the housing 3.
Finally, the needle cap 11 is mounted along the inner circular hole 61 and the inner flat hole 62 of the protective cap 6, until the fixing buckle 15 is snap-fitted into the through hole 63, so that the needle cap 11 is combined with the protective cap 6.
Working Principle:
The protective cap 6 is rotated to drive the needle cap 11 to be separated from the needle body 1. At this moment, the front end of the activation sleeve 2 is pressed to enable the spring 5 to enter a pre-compressed state. The bevel 28 of the activation sleeve 2 is gradually expanded by the inclined plane on the top of the guide table 36 of the housing 3. At this moment, the latching steps 14 on the needle body 1 can pass through the clamping position 25 of the activation sleeve. Since the spring 5 is in compression, the needle body 1 moves axially along the activation sleeve 2 under the elastic action of the spring 5. The spring 5 then enters a stretched state due to the inertia effect, until the limiting steps 13 on the needle body 1 contact the upper plane of the unlocking arm 22 of the activation sleeve to restrict the needle body 1 from continuing to move axially toward the opening of the housing 3, so that the spring 5 is stopped from stretching to control the penetration depth of the needle core 4. At this moment, the needle core 4 inside the needle body 1 is exposed from the front end of the activation sleeve, and the spring 5 loses its energy gained by compression and then enters a retracting state caused by stretching. After the spring 5 returns to its free length, the needle body 1 completely retracts into the activation sleeve 2, and the needle core 4 inside the needle body 1 is also completely in the activation sleeve.
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Number | Date | Country | Kind |
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202011458920.X | Dec 2020 | CN | national |