A blood collection needle without a rubber sleeve

Abstract

The present invention relates to the technical field of blood collection needles, and specifically to a blood collection needle without a rubber sleeve, comprising a needle holder, the needle holder comprising a sleeve and a needle seat fixed at the front end of the sleeve, the interior of the needle seat being hollow, the interior of the needle seat being a blood section, a limit section and a sliding section from the outside of the sleeve to the inside of the sleeve, the inner diameters of the blood section, the limit section and the sliding section being successively reduced; an injection needle, the injection needle comprising a needle plug and a needle stem fixed at the front end of the needle plug, the needle plug being tightly sleeved at the front end of the needle seat; a puncture assembly, the puncture assembly comprising a needle base and a puncture needle, the needle base being located inside the needle seat, the needle base comprising a sliding portion tightly slidably connected to the sliding section and a limit section adapted to the limit section, the puncture needle being fixed at the rear end of the needle base, and the sliding portion being provided with a blood channel connected to the interior of the puncture needle near the limit section. The blood collection needle does not have the problem of blood leakage when in use, and multiple blood collections can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of blood collection needles, and in particular to a blood collection needle without a rubber sleeve. Background Art

[0002] Modern medicine requires blood tests when diagnosing many diseases to determine whether certain indicators are exceeded. In clinical practice, the use of double-headed blood collection needles with vacuum blood collection tubes as a way to collect human blood samples has been widely used. The double-headed blood collection needle includes a needle holder, a needle tube for puncturing the patient's skin at the front end of the needle holder, a puncture needle for puncturing the rubber stopper of the vacuum blood collection tube at the rear end, an elastic rubber sleeve on the outer cover of the puncture needle, and a connecting thread for matching with the needle holder at the rear end of the needle holder.

[0003] When collecting blood, install the double-headed blood collection needle on the needle holder, insert the needle tube at the front end of the needle holder into the blood vessel under the patient's skin, and insert it into the puncture needle in the needle holder through the vacuum blood collection tube, and use the vacuum negative pressure to collect blood samples. The double-headed blood collection needles currently on the market claim that they can be used for multiple blood collections on the same case, but the elastic rubber sleeve on the outside of the puncture needle will not play an elastic sealing role after multiple punctures, and blood leakage will occur. Clinically, it has been found that the current double-headed blood collection needles can effectively collect blood less than 6 times. If the number of blood collections exceeds 6 times, the double-headed blood collection needle needs to be replaced and punctured again, which reduces the efficiency of blood collection and increases the pain of patients. Summary of the invention

[0004] In order to solve the above problems, the present invention designs a blood collection needle without a rubber sleeve which can realize multiple blood collections.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A blood collection needle without a rubber sleeve, comprising

[0007] A needle holder, the needle holder comprising a sleeve and a needle seat fixed at the front end of the sleeve, the needle seat is hollow inside, and the inside of the needle seat is a blood section, a limit section and a sliding section from the outside of the sleeve to the inside of the sleeve, and the inner diameters of the blood section, the limit section and the sliding section decrease in sequence;

[0008] An injection needle, the injection needle comprising a needle plug and a needle stem fixed to the front end of the needle plug, the needle plug being tightly sleeved on the front end of the needle seat;

[0009] The puncture assembly comprises a needle base and a puncture needle, wherein the needle base is located inside the needle seat, the needle base comprises a sliding portion tightly slidably connected to the sliding section and a limiting portion adapted to the limiting section, the puncture needle is fixed at the rear end of the needle base, and the sliding portion is provided with a blood channel connected to the inside of the puncture needle near the limiting portion.

[0010] Furthermore, the needle base is made of medical-grade plastic material.

[0011] Furthermore, the length of the needle base sliding part is greater than the length of the sliding section, and the diameter of the needle base sliding part is greater than the inner diameter of the sliding section by 0.02-0.1 mm.

[0012] Furthermore, a limiting protrusion is provided on the inner wall of the blood segment, the cross section of the limiting protrusion is an arc shape with a high middle portion and low sides, and the thickness of the middle portion of the limiting protrusion is greater than the difference between the inner diameters of the limiting segment and the blood segment.

[0013] Furthermore, there are a plurality of the limiting protrusions, and the plurality of limiting protrusions are arranged at intervals along the circumferential direction on the inner wall of the blood segment.

[0014] Furthermore, the distance between the limiting protrusion and the limiting section is greater than the distance between the blood channel and the front end of the limiting portion.

[0015] Furthermore, the inner diameters of the blood segment, the limiting segment and the sliding segment are 2.85 mm, 2.7 mm and 2.5 mm respectively, and the lengths of the blood segment, the limiting segment and the sliding segment are 8.5 mm, 1 mm and 4.7 mm respectively.

[0016] The beneficial effects of the present invention are:

[0017] The blood collection needle does not have the problem of blood leakage when used, can realize multiple blood collections, improves blood collection efficiency, and reduces the pain of patients; and no rubber cover is used on the blood collection needle, which reduces pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 is a stereoscopic diagram of the blood collection needle of the present invention;

[0020] Figure 2 is a side view of the blood collection needle of the present invention;

[0021] Figure 3 yes Figure 2 A longitudinal cross-sectional view of

[0022] Figure 4 is a cross-sectional view of the needle holder of the present invention;

[0023] Figure 5 yes Figure 4 A magnified view of the structure at center;

[0024] Figure 6 is a schematic diagram of the puncture assembly of the present invention;

[0025] Figure 7 This is a state diagram of the vacuum blood collection tube when the present invention is used and the puncture needle is inserted;

[0026] Figure 8 yes Figure 7 A magnified view of the structure at B in the middle;

[0027] Fig. 9 This is a state diagram of the vacuum blood collection tube when the puncture needle is pulled out during use of the present invention;

[0028] Fig.10 yes Fig. 9 Enlarged view of the structure at point C in the middle.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1-needle holder, 11-sleeve, 12-needle seat, 121-blood section, 122-limiting section, 123-sliding section, 2-injection needle, 21-needle plug, 22-needle stem, 3-puncture assembly, 31-needle base, 311-sliding part, 312-limiting part, 32-puncture needle, 33-blood channel, 4-limiting protrusion, 5-vacuum blood collection tube. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-3 As shown, a blood collection needle without a rubber sleeve includes a needle holder 1, an injection needle 2 and a puncture assembly 3.

[0033] See also Figure 4-5 As shown, the needle holder 1 includes a sleeve 11 and a needle seat 12 fixed at the front end of the sleeve 11, the interior of the needle seat 12 is hollow, and the interior of the needle seat 12 is a blood segment 121, a limiting segment 122 and a sliding segment 123 from the outside of the sleeve 11 to the inside of the sleeve 11, and the inner diameters of the blood segment 123, the limiting segment 122 and the sliding segment 123 decrease in sequence. Specifically, the inner diameters of the blood segment 121, the limiting segment 122 and the sliding segment 123 are 2.85 mm, 2.7 mm and 2.5 mm, respectively, and the lengths of the blood segment 121, the limiting segment 122 and the sliding segment 123 are 8.5 mm, 1 mm and 4.7 mm, respectively.

[0034] The injection needle 2 includes a needle plug 21 and a needle stem 22 fixed to the front end of the needle plug 21, and the needle plug 21 is tightly sleeved on the front end of the needle seat 12. The injection needle 2 is a disposable sterile injection needle with a transparent needle plug, which saves production costs, and the transparent needle plug facilitates observation of whether the puncture of the blood vessel is successful.

[0035] See also Figure 6 As shown, the puncture assembly 3 includes a needle base 31 and a puncture needle 32. The needle base 31 is located inside the needle seat 12. The needle base 31 includes a sliding portion 311 tightly connected to the sliding section 123 and a limiting portion 312 adapted to the limiting section 122. The puncture needle 32 is fixed at the rear end of the needle base 31. The sliding portion 311 is provided with a blood channel 33 connected to the inside of the puncture needle 32 near the limiting portion 312. Specifically, the needle base 31 is made of medical grade plastic material, which can be soft PVC, hard PVC, PP, ABS or other medical plastics. The length of the sliding portion 311 of the needle base 31 is greater than the length of the sliding section 123 inside the needle seat 12, and the diameter of the sliding portion 311 of the needle base 31 is greater than the inner diameter of the sliding section 123 by 0.02-0.1 mm.

[0036] As a preferred solution, the inner wall of the blood segment 121 is provided with a limiting protrusion 4 for limiting the position of the needle base 31 when inserting the vacuum blood collection tube. In order to facilitate manufacturing and save production costs, the limiting protrusion 4 is integrally injection molded with the needle seat 12. The cross section of the limiting protrusion 4 is an arc shape with a high middle part and low sides. The thickness of the middle part of the limiting protrusion 4 is greater than the difference between the inner diameters of the limiting segment 122 and the blood segment 121. There are multiple limiting protrusions 4, and the multiple limiting protrusions 4 are arranged at intervals along the circumferential direction on the inner wall of the blood segment 121. The distance between the limiting protrusion 4 and the limiting segment 122 is greater than the distance between the blood channel 22 and the front end of the limiting portion 312.

[0037] During manufacturing, after the needle holder 1, the injection needle 2 and the puncture assembly 3 are manufactured separately, the puncture assembly 3 is inserted into the needle seat 12 from the front end of the needle seat 12. Under the action of external force, the limiting portion 312 of the needle base 31 passes over the limiting protrusion 4 and cooperates with the limiting segment 122 inside the needle seat 12. At this time, the sliding portion 311 of the needle base 31 is tightly matched with the sliding segment 123 inside the needle seat 12, and the blood channel 33 opened on the sliding portion 311 is blocked by the sliding segment 123 inside the needle seat 12. The assembled blood collection needle is as follows Figure 3 As shown, the requirements for initial blood collection can be met.

[0038] Working principle: When collecting blood, the needle stem 22 of the injection needle 2 is inserted into the patient's blood vessel. Figure 7-8As shown, the vacuum blood collection tube 5 is inserted into the sleeve 11 from the rear end of the needle holder 1. When the vacuum blood collection tube 5 is inserted into the puncture needle 32, the resistance between the rubber plug of the vacuum blood collection tube and the puncture needle causes the needle base 31 to move toward the limiting protrusion 4 inside the needle seat 12, and the blood channel 33 on the sliding portion 311 of the needle base 31 is out of contact with the sliding section 123. The blood enters the blood channel 33 through the gap between the blood section 121 inside the needle seat 12 and the needle base 31, and then enters the vacuum blood collection tube 5 through the puncture needle 32. After the blood collection is completed, as shown in FIG. Figure 9-10 As shown, the vacuum blood collection tube 5 is pulled outward, and the resistance between the rubber plug of the vacuum blood collection tube and the puncture needle when the vacuum blood collection tube 5 is pulled out causes the limiting portion 312 of the needle base 31 to move toward the limiting segment 122 inside the needle seat 12 and finally to fit tightly with the limiting segment 122. At this time, the blood channel 33 located on the sliding portion 311 of the needle base 31 is blocked by the sliding segment 123 inside the needle seat 12 so that the blood cannot flow out. There is no problem of blood leakage when the blood collection needle is used, and multiple blood collections can be achieved.

[0039] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

[0040] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A blood collection needle without a rubber sleeve, characterized in that: include A needle holder, the needle holder comprising a sleeve and a needle seat fixed at the front end of the sleeve, the needle seat is hollow inside, and the inside of the needle seat is a blood section, a limit section and a sliding section from the outside of the sleeve to the inside of the sleeve, and the inner diameters of the blood section, the limit section and the sliding section decrease in sequence; An injection needle, the injection needle comprising a needle plug and a needle stem fixed to the front end of the needle plug, the needle plug being tightly sleeved on the front end of the needle seat; The puncture assembly comprises a needle base and a puncture needle, wherein the needle base is located inside the needle seat, the needle base comprises a sliding portion tightly slidably connected to the sliding section and a limiting portion adapted to the limiting section, the puncture needle is fixed at the rear end of the needle base, and the sliding portion is provided with a blood channel connected to the inside of the puncture needle near the limiting portion.

2. The non-rubber sheathed blood collection needle according to claim 1, characterized in that: The needle base is made of medical grade plastic material.

3. The non-rubber sheathed blood collection needle according to claim 2, characterized in that: The length of the needle base sliding part is greater than the length of the sliding section, and the diameter of the needle base sliding part is greater than the inner diameter of the sliding section by 0.02-0.1 mm.

4. The blood collection needle without a rubber sleeve according to claim 1, characterized in that: The inner wall of the blood segment is provided with a limiting protrusion, the cross section of the limiting protrusion is an arc shape with a high middle portion and low sides, and the thickness of the middle portion of the limiting protrusion is greater than the difference between the inner diameters of the limiting segment and the blood segment.

5. The non-rubber sheathed blood collection needle according to claim 4, characterized in that: There are a plurality of the limiting protrusions, and the plurality of the limiting protrusions are arranged at intervals along the circumferential direction on the inner wall of the blood segment.

6. The blood collection needle without a rubber sleeve according to claim 5, characterized in that: The distance between the limiting protrusion and the limiting section is greater than the distance between the blood channel and the front end of the limiting portion.

7. The non-rubber sheathed blood collection needle according to claim 1, characterized in that: The inner diameters of the blood segment, the limit segment and the sliding segment are 2.85 mm, 2.7 mm and 2.5 mm respectively, and the lengths of the blood segment, the limit segment and the sliding segment are 8.5 mm, 1 mm and 4.7 mm respectively.

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