A spring-loaded intravenous blood taking needle

Abstract

The utility model discloses a kind of ejection type venous blood lancets, including shell and inner core subassembly, inner core subassembly includes needle tube, pull rod and spring, needle tube is arranged along the length direction of pull rod, and the tail end of needle tube is connected with the one end of pull rod;Pull rod is slidably arranged in shell, and the one end of pull rod deviating from needle tube extends to the tail end outside shell, spring is sleeved on pull rod;Pull rod is equipped with baffle, the tail end of shell is equipped with limiting piece, spring is located between baffle and limiting piece;Baffle is equipped with spring pin along its radial direction, shell is equipped with a plurality of positioning holes along its length direction, spring pin and positioning hole are mutually adapted.The technical effect reached is that: the blood lancet can assist to improve the success rate of flying needle technology, compared with traditional manual puncture, pain, failure rate can also be reduced, reduce nurse professional exposure rate and shorten technical practice period, compared with now existing venous blood machine, the product is cheap, small in size and easy to carry, and can reduce patient pain.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an ejector-type venous blood collection needle. Background Technology

[0002] Venous blood collection is a common medical procedure used to extract blood samples from a patient's veins for various laboratory tests. Venous blood collection testing has become an indispensable step in diagnosis and treatment. Traditional venous blood collection needles employ conventional puncture methods, which can cause chronic, dull pain due to slow insertion speeds, leading to discomfort for the patient. Improper operation can also result in repeated punctures. Furthermore, traditional venous blood collection techniques place high demands on nurses and are prone to occupational exposure, posing a safety risk to healthcare workers. To alleviate patient pain, many nurses diligently practice traditional "flying needle" techniques, but this presents significant physical and psychological challenges, and even with specialized training, the failure rate remains high. While safer venous blood collection needles are now available on the market, their high price (generally ranging from 10 to 50 yuan per needle) significantly increases the financial burden on patients, hindering their widespread adoption.

[0003] In addition, automated blood collection technology has been implemented abroad. Okuno et al. first proposed the concept of automated venipuncture through force feedback. Furthermore, Zivanovic et al. proposed a more advanced device called Bloodbot, which uses force and positional contours to simultaneously press a probe against the skin to determine the location of blood vessels and perform blood collection mechanically. However, it has not solved the problem of patient pain. In China, Minas announced in 2016 the development of the world's first fully automated, unattended blood collection device for clinical use, possessing complete intellectual property rights. It passed type testing by the Beijing Medical Device Testing Institute and is about to enter the clinical validation stage. However, analysis shows that due to its 21 axes, overly complex structure and control, large footprint, and high cost, it has not yet achieved widespread adoption. Furthermore, although it uses machines to replace manual venipuncture, its success rate only remains at 70%-90%.

[0004] Therefore, a new type of blood collection needle needs to be designed to solve the above-mentioned technical problems. Utility Model Content

[0005] Therefore, this utility model provides an ejector-type venous blood collection needle to solve the above-mentioned problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] According to a first aspect of the present invention, a ejector-type venous blood collection needle includes a shell and an inner core assembly. The inner core assembly includes a needle tube, a pull rod, and a spring. The needle tube is arranged along the length direction of the pull rod, and the tail end of the needle tube is connected to one end of the pull rod.

[0008] The pull rod is slidably disposed inside the housing, and the end of the pull rod opposite to the needle tube extends to the outside of the tail end of the housing, and the spring is sleeved on the pull rod;

[0009] The pull rod is provided with a stop edge, the tail end of the housing is provided with a limiting member, and the spring is located between the stop edge and the limiting member;

[0010] The flange is provided with a spring pin in its radial direction, and the outer shell is provided with a plurality of positioning holes in its length direction, wherein the spring pin is adapted to the positioning holes;

[0011] The outer shell is provided with a limiting groove along its length, and the pull rod is provided with a guide tube. One end of the guide tube is connected to the needle tube, and the other end of the guide tube extends through the limiting groove to the outside of the outer shell. The head end of the needle tube can extend out from the head end of the outer shell.

[0012] Furthermore, the outer casing includes a sleeve and an end, the end being tapered and disposed at one end of the sleeve.

[0013] Furthermore, the inclination angle of the outer sidewall of the end is 20° to 30°.

[0014] Furthermore, the sleeve is cylindrical.

[0015] Furthermore, the outer casing is provided with four positioning holes along its length, and the four positioning holes are arranged at equal intervals.

[0016] Furthermore, the end of the catheter opposite to the needle tube is provided with a puncture plug.

[0017] Furthermore, the pull rod is provided with a connecting tube, which is an integral structure with the pull rod. One end of the connecting tube is connected to the needle tube, and the other end of the connecting tube extends to the outer shell and is connected to one end of the catheter.

[0018] Furthermore, a gripper is provided at one end of the pull rod extending to the tail end of the housing.

[0019] Furthermore, the gripper part is spherical or disc-shaped.

[0020] Furthermore, the flange is annular.

[0021] This invention has the following advantages: During blood collection, the pull rod is pulled according to the patient's body size to adjust the stop to a suitable position, compressing the spring to control the depth of needle insertion into the body. The spring pin, in conjunction with the corresponding positioning hole, locks the position. When the needle is aligned with the skin's blood vessel, the spring pin is pressed, and the pull rod, under the action of the spring force, drives the needle to be ejected, allowing the blood collection needle to quickly enter the blood vessel for blood collection. After blood collection, the pull rod is pulled back to retract the needle into the outer shell. The spring pin, in conjunction with the corresponding positioning hole, locks the position to prevent the needle from popping out. The needle can then be disposed of in a medical waste bin, thus completing the entire process. After use, the needle can be retracted into the outer shell, effectively reducing occupational exposure rates and preventing the spread of bloodborne diseases.

[0022] This lancet can help improve the success rate of needle-flying techniques, reduce patient pain, decrease nurses' occupational exposure rate, reduce the incidence of fainting during needle insertion, and improve efficiency and safety. By reducing pain and increasing the success rate, it demonstrates a genuine understanding of the patient's suffering from the patient's perspective, reduces the incidence of medical disputes, increases patient trust in nurses, alleviates anxiety, promotes patient well-being, and ultimately improves the success rate of disease treatment.

[0023] Compared with traditional manual puncture, it can reduce pain, error rate, nurse occupational exposure rate and shorten the technical training period. Compared with existing venous blood collection robots, this product is cheaper, smaller and easier to carry, and can reduce patient pain. Attached Figure Description

[0024] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0026] Figure 1 This is a schematic diagram of the overall structure of a catapult-type venous blood collection needle provided for some embodiments of the present invention.

[0027] Figure 2This is a schematic diagram of the outer shell of a catapult-type venous blood collection needle, provided for some embodiments of the present invention.

[0028] Figure 3 This is a schematic diagram of the inner core assembly of an ejector-type venous blood collection needle, provided for some embodiments of the present invention.

[0029] In the diagram: 1. Outer shell, 2. Spring pin, 3. Positioning hole, 4. Pull rod, 5. Guide tube, 6. Sleeve, 7. End, 8. Limiting groove, 9. Limiting component, 10. Needle tube, 11. Stop edge, 12. Spring. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] Example 1

[0032] like Figures 1 to 3 As shown, a ejector-type venous blood collection needle in the first aspect embodiment of the present invention includes a shell 1 and an inner core assembly. The inner core assembly includes a needle tube 10, a pull rod 4 and a spring 12. The needle tube 10 is arranged along the length direction of the pull rod 4, and the tail end of the needle tube 10 is connected to one end of the pull rod 4.

[0033] The pull rod 4 is slidably disposed inside the housing 1 along the length of the housing 1, and the end of the pull rod 4 away from the needle tube 10 extends to the outside of the tail end of the housing 1, and the spring 12 is sleeved on the pull rod 4;

[0034] The pull rod 4 is provided with a stop 11, the tail end of the housing 1 is provided with a limiting member 9, and the spring 12 is located between the stop 11 and the limiting member 9;

[0035] The flange 11 is provided with a spring pin 2 along its radial direction, and the outer shell 1 is provided with a plurality of positioning holes 3 along its length direction. The spring pin 2 and the positioning holes 3 are adapted to each other, and the spring pin 2 can extend out or retract from the positioning holes 3.

[0036] The outer shell 1 has a limiting groove 8 along its length, which is connected to the internal cavity of the outer shell 1. The pull rod 4 has a guide tube 5, one end of which is connected to the needle tube 10, and the other end of which passes through the limiting groove 8 and extends to the outside of the outer shell 1. The head end of the needle tube 10 can extend from the head end of the outer shell 1.

[0037] During use, the lever 4 is pulled to move the lever, thereby using the stop 11 and the limiting part 9 to compress the spring 12 as a power source. Specifically, during blood collection, the lever 4 is pulled according to the patient's body size to adjust the stop 11 to a suitable position to compress the spring 12, thereby controlling the depth of the needle tube 10 into the human body. The spring pin 2 is used in conjunction with the corresponding positioning hole 3 to lock the position. When the needle is aligned with the skin blood vessel, the spring pin 2 is pressed to retract it. Under the elastic force of the spring 12, the lever 4 drives the needle tube 10 to be ejected, so that the blood collection needle tip is quickly injected into the human blood vessel for blood collection. After blood collection, the lever 4 is pulled back to retract the needle into the outer shell. The spring pin 2 is used in conjunction with the corresponding positioning hole 3 to lock the position to prevent the needle from popping out. The needle can then be thrown into the medical waste bin to complete the entire process. After use, the needle can be retracted into the outer shell, which can effectively reduce the occupational exposure rate and avoid the spread of bloodborne diseases.

[0038] The ejector-type blood collection needle has a spring 12 mounted on the lever 4 as its power source. Spring compression is a low-cost and simple driving method. Thanks to the small size of the spring, the ejector-type venous blood collection needle is also small in size, making it easy to carry and operate. At the same time, the spring has a long lifespan. Ordinary springs have a lifespan of 50,000 to 500,000 cycles, while specially designed springs with high requirements have a lifespan of 10 million to 1 billion cycles. During the release process, the compressed spring converts elastic potential energy into kinetic energy to push the lever 4 to move, thereby pushing the blood collection needle to pierce the human skin.

[0039] In this embodiment, it should be noted that the end of the catheter 5 away from the needle tube 10 is provided with a puncture plug, which is used to insert into the vacuum blood collection tube to facilitate blood collection operations; the pull rod 4 is cylindrical, and the stop 11 is annular, with the stop 11 and the pull rod 4 being an integral structure.

[0040] Furthermore, the performance comparison of the conventional intravenous puncture needle, the intravenous blood collection robot, and this ejector-type intravenous blood collection needle is as follows:

[0041]

[0042]

[0043] The technical effects achieved in this embodiment are as follows: This blood collection needle can help improve the success rate of needle-flying techniques, reduce patient pain, reduce nurses' occupational exposure rate, reduce the incidence of fainting during needle-flying, and improve efficiency and safety. By reducing pain and increasing the success rate, it truly understands the patient's suffering from the patient's perspective, reduces the incidence of medical disputes, increases patients' trust in nurses, reduces tension, makes patients feel more comfortable, and improves the success rate of disease treatment.

[0044] Compared with traditional manual puncture, it can reduce pain, error rate, nurse occupational exposure rate and shorten the technical training period. Compared with existing venous blood collection robots, this product is cheaper, smaller and easier to carry, and can reduce patient pain.

[0045] Example 2

[0046] like Figures 1 to 3 As shown in the figure, another ejector-type venous blood collection needle provided in this embodiment has the same structure as in embodiment 1. Only the different parts are described below.

[0047] In this embodiment, the outer shell 1 includes a sleeve 6 and an end 7. The end 7 is tapered and is disposed at one end of the sleeve 6. The end 7 and the outer shell 1 are an integral structure.

[0048] The end 7 is provided with a needle outlet hole, which passes through the end 7. The needle tube 10 is slidably disposed in the needle outlet hole, and the needle tube 10 can extend out or extend into the needle outlet hole.

[0049] In this embodiment, it should be noted that the sleeve 6 is cylindrical, and the inclination angle of the outer wall of the end 7 is 20° to 30°. Preferably, the inclination angle of the outer wall of the end 7 can be set to 20°, 25° or 30°.

[0050] Furthermore, the positioning hole 3 is a round hole, and the sleeve 6 has four positioning holes 3 along its length direction. The four positioning holes 3 are arranged at equal intervals along the same straight line.

[0051] The side wall of the tip 7 has a flat surface to facilitate contact with the patient's skin, thereby controlling the direction and angle of needle insertion.

[0052] The technical effect achieved by this embodiment is that the tip 7 is tapered, and can form an angle after fitting with the patient's skin, so as to facilitate control of the needle insertion direction and angle.

[0053] Example 3

[0054] like Figures 1 to 3 As shown in the figure, another ejector-type venous blood collection needle provided in this embodiment has the same structure as in embodiment 1. Only the different parts are described below.

[0055] In this embodiment, the pull rod 4 is provided with a connecting tube, which is an integral structure with the pull rod 4. The connecting tube is made of a rigid material. One end of the connecting tube is connected to the needle tube 10, and the other end of the connecting tube extends through the limiting groove to the outside of the outer shell 1 and is connected to one end of the conduit 5.

[0056] The technical effect achieved by this embodiment is that by setting a connecting pipe, the pull rod 4 can be limited to slide in a straight line, preventing the pull rod 4 from rotating during movement.

[0057] Example 4

[0058] like Figures 1 to 3 As shown in the figure, another ejector-type venous blood collection needle provided in this embodiment has the same structure as in embodiment 1. Only the different parts are described below.

[0059] In this embodiment, a gripper is provided at one end of the pull rod 4 that extends to the tail end of the outer casing 1.

[0060] In this embodiment, it should be noted that the gripper and the lever 4 are an integral structure, and the gripper is spherical or disc-shaped.

[0061] The technical effect achieved by this embodiment is that by setting a gripper, a gripper can be provided during use, so as to drag the lever 4 to adjust the compression of the spring 12.

[0062] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0063] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

Claims

1. A ejector-type venous blood collection needle, characterized in that, It includes an outer shell (1) and an inner core assembly. The inner core assembly includes a needle tube (10), a pull rod (4) and a spring (12). The needle tube (10) is arranged along the length direction of the pull rod (4), and the tail end of the needle tube (10) is connected to one end of the pull rod (4). The pull rod (4) is slidably disposed inside the outer shell (1), and the end of the pull rod (4) away from the needle tube (10) extends to the outside of the tail end of the outer shell (1), and the spring (12) is sleeved on the pull rod (4); The pull rod (4) is provided with a stop (11), the tail end of the outer shell (1) is provided with a limiting member (9), and the spring (12) is located between the stop (11) and the limiting member (9); The retaining edge (11) is provided with a spring pin (2) in its radial direction, and the outer shell (1) is provided with a plurality of positioning holes (3) in its length direction. The spring pin (2) and the positioning holes (3) are adapted to each other. The outer shell (1) is provided with a limiting groove (8) along its length direction. The pull rod (4) is provided with a conduit (5). One end of the conduit (5) is connected to the needle tube (10). The other end of the conduit (5) extends through the limiting groove (8) to the outside of the outer shell (1). The head end of the needle tube (10) can extend out from the head end of the outer shell (1).

2. The ejector-type venous blood collection needle according to claim 1, characterized in that, The outer casing (1) includes a sleeve (6) and an end (7), the end (7) being tapered and disposed at one end of the sleeve (6).

3. The ejector-type venous blood collection needle according to claim 2, characterized in that, The inclination angle of the outer side wall of the end (7) is 20° to 30°.

4. The ejector-type venous blood collection needle according to claim 2, characterized in that, The sleeve (6) is cylindrical.

5. The ejector-type venous blood collection needle according to claim 1, characterized in that, The outer shell (1) has four positioning holes (3) along its length, and the four positioning holes (3) are equally spaced from each other.

6. The ejector-type venous blood collection needle according to claim 1, characterized in that, The catheter (5) has a puncture plug at one end away from the needle tube (10).

7. The ejector-type venous blood collection needle according to claim 6, characterized in that, The pull rod (4) is provided with a connecting tube, which is an integral structure with the pull rod (4). One end of the connecting tube is connected to the needle tube (10), and the other end of the connecting tube extends to the outside of the outer shell (1) and is connected to one end of the conduit (5).

8. The ejector-type venous blood collection needle according to claim 1, characterized in that, The pull rod (4) has a gripper at one end extending to the tail end of the outer shell (1).

9. A ejector-type venous blood collection needle according to claim 8, characterized in that, The gripper part is spherical or disc-shaped.

10. The ejector-type venous blood collection needle according to claim 1, characterized in that, The flange (11) is circular.

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