Single preloaded blood collection device

Abstract

The present invention provides a single preloaded blood collection device. The blood collection device comprises a sealing cover, a bottom cover, a piston rod, a first spring, a needle seat, an unlocking rod, a microneedle, a second spring, a handle cap, and a blood collection tube. When the unlocking rod is pressed down, a needle holder can be sequentially extruded and ejected to puncture skin, and then pressed by a certain distance, such that a buckle of the piston rod that is clamped on the bottom cover of the blood collection device can be extruded, the piston rod moves upwards under the action of elastic force of a large spring, blood enters the blood collection tube under the action of a negative pressure, and after the microneedle punctures, an internal mechanism automatically pulls the microneedle out and retracts the microneedle. The present invention adopts a double-spring structure, and a needle head and a negative pressure cavity are limited by means of two pairs of inclined surface\snap-fit devices on the piston rod and the unlocking rod being snap-fitted twice, such that it can be ensured that a user can complete the three steps of needle puncturing, blood collection, and reset at one time, reducing the technical barriers to blood collection, saving labor, and greatly improving the use convenience for the user.

Description

Single pre-press blood collector TECHNICAL FIELD

[0001] The present application belongs to the field of medical devices, and particularly relates to a blood collector for non-professional operation and use. BACKGROUND

[0002] In today's medical testing industry, blood sample collection plays a key role in disease diagnosis. However, the traditional blood collection method has many problems, especially for patients who are non-professionals, and it is difficult to find the blood vessel and accurately puncture the needle. With the continuous growth of social development and medical needs, the development of blood collection technology suitable for environments outside the hospital has become a necessity for patients.

[0003] The current blood collection technology has the following shortcomings: when collecting blood in the hospital, there are often long queues, noisy environment, and other situations, which is very inconvenient for the elderly, children and patients with difficulty in movement. Moreover, blood collection work is usually completed by professional medical staff, which not only limits the choice of blood collection location, but also puts a lot of pressure on medical resources. In addition, the traditional blood collection method also has the risk of cross infection, especially when the same blood collection equipment is repeatedly used. From a technical point of view, the existing multi-needle puncture blood collection and vacuum blood collection tube blood collection technology, although to some extent, meet the blood collection needs, but there are still many technical problems to be solved, such as complicated operation, unstable negative pressure, etc.

[0004] The applicant's prior application CN202411036196.X proposes a blood collector for non-professional operation and use, which sets the blood collection needle at the first end of the needle holder, the second end of the needle holder is in contact with the piston through the elastic device, the needle holder is provided with a stop arm, and when the launch cylinder moves in the first direction, the stop arm and the stop piece in the launch cylinder change from the first state to the second state, control the blood collection needle to be launched in the first direction, and under the control of the elastic device, the blood collection needle moves in the second direction by a preset distance, so that the blood collection needle cannot contact the skin again after one-time launch, thereby avoiding the problem of cross infection caused by multiple punctures. However, in the above-mentioned method, the negative pressure needs to be provided by the handle reset, which means that the patient needs to complete the blood collection in multiple steps, which is easy to cause misoperation or quantitative deviation, and causes inconvenience to the user. In addition, the blood collector of the above-mentioned prior application needs to be triggered by the user pressing the microneedle during use, and the user also needs to press the piston to generate negative pressure, which is not suitable for the elderly and children. SUMMARY

[0005] The application provides a blood collector, which comprises a sealing cover, a bottom cover, a piston rod, a first spring, a needle seat, an unlocking rod, a microneedle, a second spring, a handle cap and a blood collection tube; the unlocking rod is provided with a pair of reverse buckle bosses for pre-pressing the second spring, and further comprises a pair of first inclined surface bosses and a pair of second inclined surface bosses, which correspond to the needle seat and the piston rod respectively.

[0006] The application provides a blood collector, which comprises a sealing cover, a bottom cover, a piston rod, a first spring, a needle seat, an unlocking rod, a microneedle, a second spring, a handle cap and a blood collection tube;

[0007] The first spring (06) is located between the bottom cover (02) and the unlocking rod (08), and the second spring (10) is located between the piston rod (04) and the bottom cover (02);

[0008] The bottom cover (02) is provided with four first bosses (023) for limiting the needle seat (07);

[0009] The piston rod (04) comprises a first guide boss (042) arranged on the inner side and an outer side concave boss (043) arranged on the outer side, and a reverse buckle (045) corresponding to the first groove (024) of the bottom cover (02) and clamping the first spring (06) to be pre-pressed on the bottom cover (02);

[0010] The needle seat (07) is fixedly connected with the microneedle (09) through a buckle (071);

[0011] The unlocking rod (08) is provided with a pair of reverse buckle bosses (082) for pre-pressing the second spring (10); the unlocking rod (08) further comprises a pair of first inclined surface bosses (083) and a pair of second inclined surface bosses (084), the first inclined surface bosses (083) correspond to the needle seat (07), and the second inclined surface bosses (084) correspond to the piston rod (04).

[0012] In an embodiment, the blood sampler further comprises a top cover (03) which is tightly sealed with the bottom cover (02).

[0013] In an embodiment, the inside of the top cover (03) is provided with a guide groove (031) which is correspondingly guided with the piston rod (04).

[0014] In an embodiment, the blood sampler further comprises a first sealing ring (05) which forms a sealed cavity between the piston rod (04) and the top cover (03).

[0015] In an embodiment, the piston rod (04) is provided with a sealing groove (041) for mounting the first sealing ring (05), a groove guide groove (044) corresponding to the inside of the outside recess (043) for providing a guide for the unlocking rod (08).

[0016] The piston rod (04) further comprises a second groove (046) for limiting the unlocking rod (08).

[0017] The piston rod (04) further comprises a second boss (047) for providing an assembly support surface for the needle holder (07).

[0018] In an embodiment, the blood sampler further comprises a second sealing ring (11) which is mounted on the third groove (086) of the unlocking rod (08).

[0019] In an embodiment, when the unlocking rod (08) is pressed down, the first inclined boss (083) extrudes and deforms the spring inverted buckle (073) in the needle holder (07) inward, so that the spring inverted buckle (073) is separated from the second boss (047) of the piston rod (04), and then the elastic force of the second spring (10) is released, the microneedle (09) on the needle (07) is pushed out, and the microneedle (09) pierces the skin.

[0020] In an embodiment, when the unlocking rod (08) is continuously pressed down, the second inclined boss (084) extrudes and deforms the inverted buckle (045) in the piston rod (04) outward, so that the second inclined boss (084) is separated from the first groove (024) of the bottom cover (02), and then the elastic force of the first spring (06) is released to push the piston rod (04) to move upward, forming a negative pressure cavity, under the negative pressure of the negative pressure cavity, blood can enter the inside of the blood sampling tube (13).

[0021] In a feasible embodiment, after the skin is punctured, under the action of negative pressure, the piston rod (04) first spring (06) continues to move by the elastic force, drives the second guide boss (081) of the unlocking rod (08) to move upward together through the second groove (046), so that the microneedle (09) moves upward from the skin.

[0022] In a feasible embodiment, the needle holder (07) is bonded inside the second spring (10), and a guide table (072) is arranged on the outer side of the needle holder (07), which corresponds to the third groove (022) of the bottom cover (02):

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. The blood collector piston rod is provided with a buckle which is buckled on the blood collector bottom cover, and a large spring which forms negative pressure is pre-pressed in the sealed cavity. After the unlocking rod is pressed downward to unlock, the piston rod moves upward under the action of the elastic force of the large spring, and the whole cavity directly forms negative pressure in the blood collection process, so that the user does not need to additionally operate the handle to form negative pressure, the operation process is simplified, the design saves labor, and the user convenience is greatly improved.

[0025] 2. A locking buckle is arranged in the piston rod, the unlocking rod is buckled in the piston rod, the spring is pressed from below the unlocking rod, and the needle holder installed below the spring is buckled in the piston rod. When the unlocking rod is pressed downward, the needle holder can be sequentially extruded and ejected for puncture, and after being pressed by a certain distance, the buckle of the piston rod buckled on the blood collector bottom cover can be extruded, so that the piston rod moves upward under the action of the elastic force of the large spring, thereby completing the blood collection step, shortening the blood collection time, and reducing the fear of blood collection of the user.

[0026] 3. The unlocking stroke of the unlocking rod can be adjusted to a closer distance to unlock, so that the unlocking becomes pre-pressing, and the needle holder can be returned to the original position after unlocking only by a small stroke.

[0027] 4. The mechanism pre-presses the large spring in the sealed cavity through the buckle mode, forms negative pressure after the unlocking rod is triggered to unlock, and the unlocking mode saves labor.

[0028] 5. The unlocking stroke of the unlocking rod can be adjusted to a closer or farther distance to prevent the mechanism from being triggered by mistake.

[0029] 6. The ingenious arrangement of the first spring (06) and the second spring (10) provides power for the microneedle puncture and negative pressure formation in the blood collection process. Through the operation of the unlocking rod (08), the spring elastic force is sequentially released, the microneedle can quickly and accurately puncture the skin, and the blood can be smoothly collected under the action of negative pressure. The whole process is simple and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a three-view drawing of the blood collection tube sealing cover of the present invention.

[0031] Figure 2 shows the front view and top view of the bottom cover of the blood collection tube of the present invention.

[0032] Figure 3 is a bottom view of the top cover of the blood collection tube of the present invention.

[0033] Figure 4 shows the front view and top view of the blood collection tube piston rod of the present invention.

[0034] Figure 5 shows the front view and top view of the blood collection needle holder of the present invention.

[0035] Figure 6 shows the front view 1, front view 2 and top view of the blood collection tube unlocking rod of the present invention.

[0036] Figure 7 is a schematic diagram of the original working state of the blood collection tube of the present invention.

[0037] Figure 8 is a schematic diagram of the first unlocked working state of the blood collection tube of the present invention.

[0038] Figure 9 is a schematic diagram of the working state of the blood collection tube of the present invention through microneedle puncture of the skin.

[0039] Figure 10 is a schematic diagram of the second unlocked working state of the blood collection tube of the present invention.

[0040] Figure 11 is a schematic diagram of the completed working state of the blood collection tube of the present invention. Detailed Implementation

[0041] According to Figures 1-11, the present invention provides a blood collection device, comprising: a sealing cover (01), a bottom cover (02), a top cover (03), a piston rod (04), a first sealing ring (05), a first spring (06), a needle seat (07), an unlocking rod (08), a microneedle (09), a second spring (10), a handle cap (11), a second sealing ring (12), and a blood collection tube (13).

[0042] In one feasible embodiment, referring to Figure 1, the sealing cover (01) is a soft rubber that fits the skin. Under vacuum negative pressure, it forms a sealed surface with the skin, which facilitates the blood to be drawn out and then flow into the blood collection tube (13) through a micro-channel.

[0043] The outer surface of the sealing cover (01) is a lip-shaped sealing ring (011), which can be adhered to the skin surface with adhesive. The back of the adhesive side has a beveled guide groove. Blood flows along the flow channel into the blood collection tube, reducing the time blood spends in the collector and preventing blood from forming clots on the flow channel that would hinder detection and sample absorption.

[0044] The microchannel (015) of the sealing cover (01): its surface is made of hydrophobic soft rubber material, and its flow channel surface is the fastest curve, which can make the blood sample take the shortest time to reach the same position and flow out the fastest.

[0045] In a feasible embodiment, referring to FIG. 2, the bottom cover (02) supports the sealing cover and forms a seal with the top cover (03) through the male-female buckle; the support ring inside is provided with guide grooves on the inner and outer sides, the outer side is used to provide the first guide (021) for the piston rod, and the inner side is used to provide the second guide (022) for the needle seat; in addition, the inside is provided with four first bosses (023), the four first bosses (023) are used to limit the needle seat (07) after being launched, so that the distance of the micro-needles launched to the skin surface is fixed, and the fixed depth of the micro-needles penetrating into the skin is ensured; in addition, the support ring inside is provided with a pair of first grooves (024), which are used to clamp the undercut of the piston rod (04).

[0046] In a feasible embodiment, referring to FIG. 3, the top cover (03) is the support of the entire sampler shell and forms a seal with the bottom cover (02) through the male-female buckle; the top end is an opening, and the inner side of the circular ring is provided with a guide groove (031) for guiding the piston rod (04).

[0047] In a feasible embodiment, referring to FIG. 4, the piston rod (04) is provided with a sealing groove (041) for installing a sealing ring, the inner side is provided with a first guide boss (042) for guiding the movement in the bottom cover (02), the outer side is provided with a recess (043), which can guide the movement in the top cover (03); the inner side corresponding to the outer side boss (043) is provided with a groove guide groove (044), which provides a guide for the unlocking rod (08); the piston rod (04) is provided with an undercut (045), which is clamped in the first groove (024) of the bottom cover (02) during assembly, and the first spring (06) is pre-pressed on the bottom cover (02); the piston rod (04) is provided with a second groove (046), which is used to clamp the unlocking rod (08) on the inner side for limiting; the piston rod (04) is further provided with a second boss (047) inside, which provides an assembly support surface for the needle seat (07).

[0048] In a feasible embodiment, the first sealing ring (05) forms a sealed cavity between the piston rod (04) and the top cover (03). When the piston rod (04) moves upwards, the first sealing ring (05) and the top cover (02) form an air sealing area with pressure, so that the sealing is better, and there is a small amount of medical silicone oil inside, so that the sealing is better and the pressing is smoother.

[0049] Further, the first spring (06) forms a vacuum degree emptying continuous power for the vacuum cavity.

[0050] In a feasible embodiment, referring to Figure 5, the needle holder (07) is used to install the microneedle, and the microneedle holder is clamped by buckle (071) to have better adaptability; the second spring (10) is bonded inside the needle holder (07) and assembled on the piston rod (04); the guiding table (072) is arranged on the outside of the needle holder (07) and can move in the third groove (022) of the base (02); a pair of third protrusions (073) are arranged on the needle holder (07), which are limited by the first protrusion (023) of the base (02) after the needle holder (07) is ejected, and ensure that the microneedle penetrates the skin to a fixed depth; a pair of spring reverse buckles (074) are arranged on the needle holder (07), when the unlocking rod (08) is pressed downward, the guiding surface of the unlocking rod (08) extrudes the spring reverse buckle (074) inward to deform, so that the spring reverse buckle (074) is separated from the second protrusion (047) of the piston rod (04), and then the needle holder (07) is ejected downward under the elastic force of the second spring (10), so that the microneedle penetrates the skin, and when the movement is fixed distance, the needle holder (07) is limited by the first protrusion (023) of the base (02) to complete the whole penetration action.

[0051] In a feasible embodiment, referring to Figure 6, the unlocking rod (08) is arranged with the second guiding protrusion (081) on the outside, which can move in the piston rod (040) to a certain distance, when the piston rod (04) moves upward in reverse, the second guiding protrusion (081) of the unlocking rod (08) is driven upward together with the second groove (046) of the piston rod (04); a pair of reverse buckle protrusions (082) are arranged on the unlocking rod (08), the second spring (10) is bonded inside the reverse buckle protrusions (082) during assembly, and the reverse buckle protrusions (082) are clamped in the second groove (046) of the piston rod (04) when the second spring (10) is pre-pressed; the unlocking rod is additionally arranged with two pairs of unlocking inclined surface protrusions, i.e. the first inclined surface protrusion (083) and the second inclined surface protrusion (084), when the unlocking rod (08) is pressed downward to unlock, the first inclined surface protrusion (083) first extrudes the spring reverse buckle (073) of the needle holder (07) inward to deform, so that the spring reverse buckle (073) is separated from the second protrusion (047) of the piston rod (04), and then the needle holder (07) is ejected downward under the elastic force of the second spring (10), so that the microneedle penetrates the skin.

[0052] Further, when the unlocking rod (08) continues to press down and unlock, the other pair of second inclined surface bosses (084) will extrude and deform the reverse buckle (045) of the piston rod (04) outward, and the reverse buckle (045) will be separated from the first groove (024) of the bottom cover (02). Under the elastic force of the first spring (06), the piston rod (04) moves upward, and the air in the sealed cavity is sucked out to form a negative pressure cavity. Under the action of negative pressure, a small amount of blood will continue to flow out after being pricked by the needle, and the blood will flow into the blood collection tube (13) along the guide groove of the sealing cover under the action of gravity. At this time, the piston rod (04) continues to move upward, and the second groove (046) of the piston rod (04) also drives the second guide boss (081) of the unlocking rod (08) to move upward, and the microneedle (09) is installed on the needle seat (07). The needle seat (07) is connected together through the second spring (10) and the unlocking rod (08). At this time, the microneedle also moves back from the skin; the unlocking rod is provided with a pair of fourth grooves (085) for clamping the handle cap (11); the unlocking rod is provided with a third groove (086) for installing the second sealing ring (11), which is used to form a sealed cavity.

[0053] Further, the microneedle (09) installed on the needle seat (07) provides the effect of pricking the skin for blood collection.

[0054] Further, the second spring (10) is adhered to the inner concave surface of the needle seat (07) and the unlocking rod (08) at both ends, which is used to store energy and provide power for the microneedle.

[0055] Further, the handle cap (11) is installed on the unlocking rod (08) for aesthetic effect and user pressing.

[0056] Further, the second sealing ring (12) is installed on the third groove (086) of the unlocking rod (08) to form a sealed cavity.

[0057] Further, the blood collection tube (13) collects the blood sample flowing from the skin after pricking.

[0058] In one feasible embodiment, as shown in Figures 7-11, when using the blood collection device, the user needs to put the blood collection tube on the sealing cover to form a seal between the blood outlet of the sample and the sealing cover. The blood collection device mechanism is a one-button trigger type. When the user presses the handle cap (11) a certain distance, the unlocking rod (08) will also be pressed down to unlock. In the first inclined boss (083) of the two inclined bosses set in the unlocking rod, the spring buckle (073) of the needle seat (07) is first squeezed and deformed inward, so that the spring buckle (073) is disengaged from the second boss (047) of the piston rod (04), and thus it is launched downward under the elastic force of the spring, so that the microneedle (09) punctures the skin. The base (02) has four first protrusions (023) inside. When the needle seat (07) is fired, it is limited to ensure that the microneedle (09) is fired to a fixed distance from the skin surface and that the microneedle (09) penetrates the skin to a fixed depth. When the unlocking rod (08) continues to be pressed down to unlock, another pair of second inclined protrusions (084) will squeeze the buckle (045) of the piston rod (04) outward and deform it, and separate it from the first groove (024) of the bottom cover (02). Under the elastic force of the first spring (06), the piston rod (04) moves upward and draws out the air in the sealed cavity to form a negative pressure cavity. Under the negative pressure, the skin pierced by the needle will continuously flow out a small amount of blood. After the blood is collected, it flows into the blood collection tube (13) along the guide groove of the sealing cover under the action of gravity. At this time, the piston rod (04) continues to move upward, and the second groove (046) of the piston rod (04) will also drive the second guide boss (081) of the unlocking rod (08) to move upward. The needle seat (07) is connected to the unlocking rod (08) through the second spring (10). At this time, the microneedle (09) will also detach from the skin and move back.

[0059] Furthermore, under negative pressure, a small amount of blood will continuously flow out of the skin punctured by the needle. After the blood is collected, it flows into the blood collection tube (13) along the guide groove of the sealing cover under the action of gravity.

[0060] Furthermore, after the microneedle (09) punctures, a wound surface is formed. After the blood sample seeps out, due to the small amount, the blood will remain in place. When the blood reaches a certain volume, they will adhere to each other. Due to the difference in hydrophilicity, the blood will flow along the wound formation into the sealed cover (01).

[0061] Furthermore, the sealing cover (01) is tightly adhered to the skin, and under negative pressure, it adheres tightly to the skin. The guide slope (012) draws the blood samples together and flows downward. Because the guide slope (012) is a hydrophobic new material, the surface does not stick to the sample. The collected sample flows along the microchannel (015) under the action of gravity and accelerates to the guide slope (012), entering the blood collection tube 13 of the catheter.

[0062] While the application has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the application is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements. Accordingly, other embodiments of the application are intended to be within the scope of the appended claims, although other alternatives can occur to those skilled in the art upon employment of the novel teachings presented herein.

Claims

1. A blood collection device, characterized in that: The device includes a sealing cover (01), a bottom cover (02), a piston rod (04), a first spring (06), a needle holder (07), an unlocking rod (08), a microneedle (09), a second spring (10), a handle cap (11), and a blood collection tube (13). The first spring (06) is located between the bottom cover (02) and the unlocking rod (08), and the second spring (10) is located between the piston rod (04) and the bottom cover (02). The bottom cover (02) is provided with four first protrusions (023), which are used to limit the needle holder (07). The piston rod (04) has a first guide protrusion (042) on its inner side and an outer recess (043) on its outer side. The buckle (045) corresponds to the first groove (024) of the bottom cover (02), and the buckle engages to pre-press the first spring (06) onto the bottom cover (02); the needle seat (07) is fixedly connected to the micro needle (09) by a buckle (071); the unlocking rod (08) is provided with a pair of buckle protrusions (082), which pre-press the second spring (10); the unlocking rod (08) also includes a pair of first inclined protrusions (083) and a pair of second inclined protrusions (084), the first inclined protrusions (083) correspond to the needle seat (07), and the second inclined protrusions (084) correspond to the piston rod (04).

2. The blood collection device as claimed in claim 1, the blood collection device further comprising a top cover (03), the top cover (03) and the bottom cover (02) being pressed and sealed together.

3. The blood collection device as described in claim 2, wherein a guide groove (031) is provided on the inner side of the top cover (03), and the guide groove (031) is guided and corresponds to the piston rod (04).

4. The blood collection device as claimed in claim 2, wherein the blood collection device further comprises a first sealing ring (05), the first sealing ring (05) forming a sealed cavity between the piston rod (04) and the top cover (03).

5. The blood collection device as described in claim 4, wherein the piston rod (04) is provided with a sealing groove (041) for installing the first sealing ring (05) and a groove guide groove (044) corresponding to the inner side of the outer recess (043) to provide guidance for the unlocking rod (08); The piston rod (04) also includes a second groove (046) which limits the unlocking rod (08); The piston rod (04) also includes a second boss (047), which provides an assembly support surface for the needle seat (07).

6. The blood collection device as claimed in claim 1, the blood collection device further comprising a second sealing ring (11), the second sealing ring (11) being mounted on a third groove (086) of the unlocking rod (08).

7. The blood collection device as claimed in claim 1, when the unlocking rod (08) is pressed down, the first inclined boss (083) squeezes and deforms the spring buckle (073) in the needle seat (07) inward, so that the spring buckle (073) disengages from the second boss (047) of the piston rod (04), thereby causing the second spring (10) to release its elasticity and push the microneedle (09) on the needle seat (07) out, so that the microneedle (09) pierces the skin.

8. In the blood collection device as described in claim 7, when the unlocking rod (08) is continuously pressed down, the second inclined boss (084) squeezes and deforms the buckle (045) in the piston rod (04) outward, so that the second inclined surface (084) is separated from the first groove (024) of the bottom cover (02), thereby causing the first spring (06) to release its elastic force and push the piston rod (04) upward to form a negative pressure cavity. Under the negative pressure of the negative pressure cavity, blood can enter the blood collection tube (13).

9. In the blood collection device as described in claim 8, after the skin is punctured, under the negative pressure, the piston rod (04) moves continuously under the elastic force of the first spring (06), and the second groove (046) drives the second guide boss (081) of the unlocking rod (08) to move upward together, so that the microneedle (09) is disengaged from the skin and moves upward.

10. The blood collection device as claimed in claim 1, wherein the needle seat (07) is internally bonded to the second spring (10), and a guide platform (072) is provided on its outer side, the guide platform (072) corresponding to the third groove (022) of the bottom cover (02).

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