A disposable distal blood collection needle

Abstract

The invention discloses a disposable peripheral blood collection needle, which relates to the technical field of medical equipment. The structure comprises a shell, a first elastic member, a needle assembly with a puncture needle installed thereon, and a second elastic member. The shell is provided with a first cavity, one end of which is provided with a perforation, a first channel is formed in the first cavity, a sliding sleeve is arranged at the position of the first cavity, slidably connected to the first channel, a second cavity is provided with the sliding sleeve, a second channel with a needle outlet is formed in the second cavity, the needle outlet of the second channel is aligned with the perforation, one end of the sliding sleeve passes through the perforation, the first elastic member is arranged at the position of the second cavity, the needle assembly is provided with a first end and a second end, the first end of the needle assembly is sleeved with the first elastic member, the needle assembly is slidably connected to the second channel, the puncture needle is aligned with the needle outlet of the second channel, and compared with the prior art, the invention has a compact structure and high safety, and the needle assembly can stably slide in the inner cavity of the shell, thereby minimizing trauma to the patient.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to a disposable distal blood collection needle. Background Art

[0002] With the vigorous development of the medical field, our blood drawing technology has become very mature. Now in clinical medicine, in order to minimize the pain of patients when having blood drawn, the method and amount of blood drawing have become very different for different diseases. When clinical tests conduct micro-blood drawing, they no longer draw one or even multiple test tubes of blood from patients for testing. Instead, blood is drawn only through minimally invasive incisions at the extremities of the human skin.

[0003] The existing blood collection needle includes a needle assembly, an outer shell, an elastic mechanism, etc. The current needle assembly is generally composed of an inner sleeve movably connected to the outer shell and a steel needle connected to the inner sleeve. The inner sleeve positions the exposed length of the steel needle to ensure the stable penetration depth of the skin. Among them, the traditional blood collection needle structure is not compact enough and cannot operate stably during operation. The needle assembly is prone to shaking during movement, which may increase the area of ​​the patient's trauma. Some blood collection needles are not equipped with a protection system. The spring pushes the steel needle on the needle assembly to pierce the skin, but in the process of spring rebound, the blood collection needle may pierce the skin a second time, causing unnecessary trauma. Some blood collection needles have poor sealing problems when not in use, and the puncture needle is easily contaminated, thereby endangering the patient's life.

[0004] To this end, the present invention discloses a disposable peripheral blood collection needle. Compared with the prior art, the present invention has a compact structure and high safety, and the needle assembly can stably slide in the inner cavity of the shell, thereby minimizing trauma to the patient. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a disposable peripheral blood collection needle. Compared with the prior art, the present invention has a compact structure and high safety, and the needle assembly can slide stably in the inner cavity of the shell, thereby minimizing trauma to the patient.

[0006] The present invention is realized through the following technical scheme: a disposable peripheral blood collection needle comprises a shell, a sliding sleeve, a first elastic member, a needle assembly with a puncture needle installed thereon, and a second elastic member, the shell being provided with a first cavity, one end of which is provided with a perforation, a first channel being formed in the first cavity, the sliding sleeve being arranged at the position of the first cavity and slidably connected to the first channel, the sliding sleeve being provided with a second cavity, a second channel with a needle outlet being formed in the second cavity, the needle outlet of the second channel being aligned with the perforation, one end of the sliding sleeve passing through the perforation, the first elastic member being arranged at the position of the second cavity, the needle assembly being provided with a first end and a second end, the first end of the needle assembly being sleeved with the first elastic member, and the needle assembly being slidably connected to the second channel, the puncture needle being aligned with the needle outlet of the second channel, the second elastic member being arranged to be sleeved at the position of the second end of the needle assembly, Among them, at least two first limit blocks are fixedly arranged on the surface of the needle assembly, two first limit arms are fixedly arranged on the end of the sliding sleeve away from the needle outlet, a sliding rail is opened on the surface of the first limit arm, and the end of the first limit arm that does not contact the sliding sleeve is provided with an inclined surface bent toward the inner wall direction of the first cavity to form an opening, a first limit groove is provided at the inclined surface position of the first limit arm, and the end of the first cavity close to the opening of the first limit arm is provided with a protrusion, the first limit block and the first limit groove cooperate to complete the limiting of the needle assembly, and when force is applied to the sliding sleeve to make the sliding sleeve move in the first channel toward the protrusion, the protrusion contacts and squeezes the upper inclined surface of the limiting arm, and the inclined surface bends toward the inner wall direction of the first cavity, and the size of the opening becomes larger. At this time, the first limit block does not contact the first limit groove, and the needle assembly moves toward one end of the needle outlet in the second channel under the action of the second elastic member.

[0007] For the present invention, when it is not in use, part of the structure of the sliding sleeve passes through the perforation and extends to the outside of the first cavity. At this time, the first limit block is set at the position of the first limit groove, and the second elastic member presses the needle assembly tightly. The first limit block and the first limit groove can be matched in a buckle manner to prevent the needle assembly from moving along the second channel to the needle outlet position. When the blood collection needle of the present invention needs to be used, the sliding sleeve extending outside the first cavity is contacted and squeezed to squeeze the skin at the position where blood needs to be collected, so that the sliding sleeve moves in the first channel in a direction close to the protrusion until the protrusion contacts the upper inclined surface of the squeezing limit arm. At this time, the inclined surface bends toward the inner wall of the first cavity, and the size of the opening becomes larger. At this time, the first limit block does not contact the first limit groove, and the needle assembly moves toward one end of the needle outlet in the second channel under the action of the second elastic member. The puncture needle quickly passes through the needle outlet and the perforation under the action of the thrust to puncture the skin, wherein the exposed tip length of the puncture needle on the needle assembly is controlled between 1.6-2.2mm, thereby ensuring that the depth of penetration into the skin is stable and the epidermis is punctured. And it does not penetrate into the subcutaneous tissue, and there is no strong pain. In the process of piercing the skin, the needle assembly squeezes the first elastic member arranged at the second channel position. Because the potential energy applied by the second elastic member is greater than the maximum potential energy that can be stored by the first elastic member, the first elastic member is completely compressed under the action of the force applied by the second elastic member. The second elastic member is stretched by the needle assembly due to inertia in this process. After the second elastic member moves to the farthest distance, the second elastic member and the first elastic member apply forces in the same direction to the needle assembly, so that the puncture quickly shrinks into the first cavity, thereby completing the task of piercing the skin. In addition to the function of limiting the movement of the needle assembly, the limit block also has a guiding function. In the process of the needle assembly moving toward the needle outlet end in the second channel under the action of the second elastic member, the needle assembly is embedded in the slide rail on the surface of the first limit arm, thereby maintaining the stability of the needle assembly during the movement process. At least two limit arms clamp the needle assembly, and the needle assembly will not shake easily, thereby minimizing physical trauma to the patient.

[0008] Preferably, in order to facilitate the production and assembly of the present invention, the shell includes an outer shell provided with a first cavity and a back cover, the perforation is arranged at one end of the outer shell, an opening is arranged at the end of the outer shell away from the perforation, and the back cover is arranged at the opening position of the outer shell to seal the opening, wherein the protrusion is arranged at the position of the back cover, the outer shell and the back cover together constitute a first cavity, and the sliding sleeve, the first elastic member, the needle assembly with the puncture needle installed and the second elastic member are all arranged inside the first cavity, and these structural parts are relatively compact, which is convenient for the manufacturer to assemble.

[0009] Preferably, in order to enable the sleeve to stably slide and connect to the shell, a first guide arm is provided on the inner wall of the first cavity of the shell, and at least two second limit arms are also provided on one end of the sleeve connected to the first limit arm. A second slide rail is provided on the outer wall of the second limit arm, and the second slide rail is slidably connected to the first guide arm, thereby ensuring the sliding stability of the shell. The first guide arm is an elastic arm body, which forms a certain angle with the inner wall of the first cavity. After the sleeve is installed, the angle between the first guide arm and the cavity is reduced, so that the first guide arm applies a lateral force to the position of the second limit arm during the longitudinal movement along the second slide rail, thereby reducing the jitter of the sleeve, and also increasing the damping and reducing the amplitude. The first elastic member and the second elastic member can both be set as springs to prevent the simple harmonic motion of the spring from repeatedly puncturing the wound.

[0010] Preferably, at least two second limit blocks are fixedly provided on the surface of the needle assembly, a third slide rail is provided on the inner wall of the second limit arm, and the second limit block is slidably connected to the third slide rail, wherein the second limit block includes a hollow strip shell, a notch is provided at one end of the strip shell, and a plurality of elastic springs are provided in the cavity of the strip shell, the extrusion block passes through the position of the strip shell, and the elastic spring acts on the slide plate, the slide plate is fixedly connected to the extrusion block, wherein the extrusion block contacts the third slide rail, thereby reducing the jitter of the needle assembly during the sliding process.

[0011] Preferably, in order to enhance the stability of the needle assembly movement, the second limiting arm and / or the first limiting arm are elastic clamping arms, which deform toward the direction of the needle assembly to squeeze the needle assembly. During the longitudinal movement of the needle assembly in the sliding sleeve, the second limiting arm and / or the first limiting arm clamps the needle assembly and exerts a lateral force on it, thereby making the needle assembly more stable during movement.

[0012] Preferably, in order to facilitate the use of the present invention, two anti-skid grooves are provided on the surface of the shell, and a rubber layer is provided on the outer surface of the anti-skid groove. Medical personnel can enhance the stability of finger clamping by placing their fingers in the anti-skid grooves.

[0013] Preferably, in order to adjust the exposed length of the puncture needle, the needle assembly includes a puncture needle and a mounting seat for mounting the puncture needle, the mounting seat is provided with a mounting groove with a thread on the inner wall, one end surface of the puncture needle is provided with a thread, and the other end is arranged in a triangular shape; wherein, the end of the puncture needle provided with a thread is threadedly connected to the mounting groove, and the puncture needle is rotated to change the position of the puncture needle and the mounting groove, thereby changing the exposed length of the puncture needle.

[0014] Preferably, in order to facilitate the adjustment of the exposed length of the puncture needle, the mounting seat includes a mounting tube and a mounting shell, wherein the mounting tube is detachably connected to the mounting shell, and the mounting groove is arranged at the position of the mounting shell, so that the mounting tube can be removed and then the puncture needle can be rotated, wherein the mounting tube has a protective effect on the puncture needle to prevent the puncture needle from being bent.

[0015] Preferably, the present invention also includes a hollow needle cap, an end of the outer shell close to the perforation is arranged as a first connecting end, a second connecting end is arranged on the inner wall of the needle cap, the outer shell and the needle cap are detachably connected through the cooperation of the first connecting end and the second connecting end, a boss is arranged inside the cavity of the needle cap, and the boss is arranged on the side wall surface away from the second connecting end, wherein, when the needle cap and the outer shell are installed together, the boss contacts the perforation, which completely seals the perforation, thereby preventing the puncture needle from being contaminated when it is not in use.

[0016] The present invention discloses a disposable distal blood collection needle. Compared with the prior art:

[0017] The present invention has a compact structure and high safety. The needle assembly can stably slide in the inner cavity of the shell, thereby minimizing trauma to the patient. For the present invention, when not in use, part of the structure of the sliding sleeve passes through the perforation and extends to the outside of the first cavity. At this time, the first limit block is set at the position of the first limit groove, and the second elastic member presses the needle assembly tightly. The first limit block and the first limit groove can be matched in a buckle manner to prevent the needle assembly from moving along the second channel to the needle outlet position. When the blood collection needle of the present invention needs to be used, The sliding sleeve extending outside the first cavity contacts and squeezes the position where the skin needs to be blood drawn, so that the sliding sleeve moves in the first channel toward the direction close to the protrusion until the protrusion contacts the upper inclined surface of the extrusion limit arm. At this time, the inclined surface bends toward the inner wall of the first cavity, and the size of the opening becomes larger. At this time, the first limit block does not contact the first limit groove. The needle assembly moves toward one end of the needle outlet in the second channel under the action of the second elastic member. The puncture needle quickly passes through the needle outlet and the perforation under the action of the thrust to puncture the skin. The length of the puncture needle exposed on the needle assembly is controlled to be 1.6-2.2 mm, thereby ensuring that the depth of penetration into the skin is stable, piercing the epidermis, and not penetrating into the subcutaneous tissue, without strong pain. In the process of piercing the skin, the needle assembly squeezes the first elastic member arranged at the position of the second channel. Because the potential energy applied by the second elastic member is greater than the maximum potential energy that can be stored by the first elastic member, the first elastic member is completely compressed under the action of the force applied by the second elastic member. The second elastic member is stretched by the needle assembly due to inertial movement in this process. After the second elastic member moves to the farthest distance, the second elastic member and the first elastic member apply forces in the same direction to the needle assembly, so that the puncture quickly shrinks into the first cavity, thereby completing the task of piercing the skin. In addition to the function of limiting the movement of the needle assembly, the limit block also has a guiding function. In the process of the needle assembly moving toward one end of the needle outlet in the second channel under the action of the second elastic member, the needle assembly is embedded in the slide rail on the surface of the first limit arm, thereby maintaining the stability of the needle assembly during the movement process. At least two limit arms clamp the needle assembly, and the needle assembly will not shake easily, thereby minimizing the physical trauma to the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the explosion structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the appearance of the present invention;

[0020] Figure 3 for Figure 2 The cross-sectional view along the AA direction;

[0021] Figure 4 A schematic diagram of the appearance of the sliding sleeve of the present invention at one angle;

[0022] Figure 5 A schematic diagram of the appearance of the housing of the present invention at one angle;

[0023] Figure 6 For the present invention to distinguish Figure 5 A schematic diagram of the appearance of the housing from another angle;

[0024] Figure 7 The present invention is distinguished from Figure 4 A schematic diagram of the appearance of the sliding sleeve from another angle;

[0025] Figure 8 It is a schematic diagram of the structure of the needle assembly in the present invention;

[0026] Fig. 9 is a cross-sectional view of the needle cap of the present invention;

[0027] Fig.10 It is a schematic structural diagram of the second limiting block in the present invention. DETAILED DESCRIPTION

[0028] like Figures 1 to 4 As shown, the present invention discloses a disposable peripheral blood collection needle, comprising a shell, a sliding sleeve 3, a first elastic member 4, a needle assembly 5 with a puncture needle installed, and a second elastic member 6. The shell is arranged with a first cavity, one end of which is provided with a perforation, a first channel is formed in the first cavity, the sliding sleeve 3 is arranged at the position of the first cavity, and is slidably connected to the first channel, the sliding sleeve 3 is arranged with a second cavity, a second channel with a needle outlet is formed in the second cavity, the needle outlet of the second channel is aligned with the perforation, one end of the sliding sleeve 3 passes through the perforation, the first elastic member 4 is arranged at the position of the second cavity, the needle assembly 5 is arranged with a first end and a second end, the first end of the needle assembly 5 is sleeved with the first elastic member 4, and the needle assembly 5 is slidably connected to the second channel, the puncture needle 5 is aligned with the needle outlet of the second channel, and the second elastic member 6 is arranged to be sleeved at the second end of the needle assembly 5.

[0029] Among them, Figure 4 , Figure 7 and Figure 8As shown, at least two first limiting blocks 51 are fixedly provided on the surface of the needle assembly 5, and two first limiting arms 31 are fixedly provided on the end of the sliding sleeve 3 away from the needle outlet. A sliding rail 311 is provided on the surface of the first limiting arm 31, and the end of the first limiting arm 31 that does not contact the sliding sleeve 3 is provided with an inclined surface bent toward the inner wall direction of the first cavity to form an opening. A first limiting groove 312 is provided at the inclined surface position of the first limiting arm 31, and a protrusion is provided at the end of the first cavity close to the opening of the first limiting arm 31. The first limiting block 51 cooperates with the first limiting groove 312 to complete the limiting of the needle assembly 5. When force is applied to the sliding sleeve 3 to move the sliding sleeve 3 in the first channel toward the direction close to the protrusion, the protrusion contacts and squeezes the upper inclined surface of the limiting arm 31, and the inclined surface bends toward the inner wall direction of the first cavity, and the size of the opening becomes larger. At this time, the first limiting block 51 does not contact the first limiting groove 312, and the needle assembly 5 moves toward one end of the needle outlet in the second channel under the action of the second elastic member 6.

[0030] Based on the above structure, for the present invention, when not in use, part of the structure of the sliding sleeve 3 passes through the perforation and extends to the outside of the first cavity. At this time, the first limiting block 51 is set at the position of the first limiting groove 312, and the second elastic member 6 presses against the needle assembly 51. The first limiting block 51 and the first limiting groove 312 can be matched in a snap-fit ​​manner to prevent the needle assembly 51 from moving along the second channel to the needle outlet position. When the blood collection needle of the present invention needs to be used, the sliding sleeve 3 extending outside the first cavity is contacted and squeezed to the position where the skin needs to be blood collected, so that The sliding sleeve 3 moves in the first channel toward the direction close to the protrusion until the protrusion contacts the upper inclined surface of the extrusion limit arm 31. At this time, the inclined surface bends toward the inner wall of the first cavity, and the size of the opening becomes larger. At this time, the first limit block 51 does not contact the first limit groove 312. The needle assembly 5 moves toward one end of the needle outlet in the second channel under the action of the second elastic member 6. The puncture needle quickly passes through the needle outlet and the perforation under the action of the thrust to puncture the skin. The exposed length of the puncture needle on the needle assembly 5 is controlled between 1.6 and 2.2 mm, thereby ensuring that the depth of penetration into the skin is stable and puncture is The needle assembly 5 squeezes the first elastic member 4 arranged at the second channel position, and does not penetrate into the epidermis, and does not penetrate into the subcutaneous tissue, and there is no strong pain. In the process of piercing the skin, the needle assembly 5 squeezes the first elastic member 4 arranged at the second channel position. Because the potential energy applied by the second elastic member 6 is greater than the maximum potential energy that can be stored in the first elastic member 4, the first elastic member 4 is completely compressed under the action of the force applied by the second elastic member 6. The second elastic member 6 is stretched by the needle assembly 5 due to inertia in this process. After the second elastic member 6 moves to the farthest distance, the second elastic member 6 and the first elastic member 4 apply forces in the same direction to the needle assembly 5. , so that the puncture needle quickly retracts and enters the first cavity, thereby completing the task of piercing the skin. The limit block 51 not only has the function of limiting the movement of the needle assembly 5 but also has the function of guiding. In the process of the needle assembly 5 moving toward the needle outlet end in the second channel under the action of the second elastic member 6, the needle assembly 5 is embedded in the slide rail 311 on the surface of the first limit arm 31, so as to maintain the stability of the needle assembly 5 during the movement process. At least two limit arms 31 clamp the needle assembly 5, and the needle assembly 5 will not shake easily, thereby minimizing the physical trauma to the patient.

[0031] Furthermore, if Figure 1 As shown, in order to facilitate the production and assembly of the present invention, the shell includes an outer shell 2 provided with a first cavity and a back cover 7, the perforation is arranged at one end of the outer shell 2, an opening is arranged at the end of the outer shell 2 away from the perforation, and the back cover 7 is arranged at the opening position of the outer shell 2 to seal the opening, wherein the protrusion is arranged at the position of the back cover 7, the outer shell 2 and the back cover 7 together constitute a first cavity, and the sliding sleeve 3, the first elastic member 4, the needle assembly 5 equipped with a puncture needle and the second elastic member 6 are all arranged inside the first cavity, and these structural parts are relatively compact, which is convenient for the manufacturer to assemble.

[0032] Further, such as Figures 4 to 6 As shown, in order to enable the sleeve 3 to be stably slidably connected to the shell 2, a first guide arm 23 is provided on the inner wall of the first cavity of the shell 2, and at least two second limit arms 32 are also provided on one end of the sleeve 3 connected to the first limit arm 31, and a second slide rail 321 is provided on the outer wall of the second limit arm 32, and the second slide rail 321 is slidably connected to the first guide arm 23, thereby ensuring the sliding stability of the shell 2, wherein the first guide arm 23 is an elastic arm body, which forms a certain angle with the inner wall of the first cavity. After the sleeve 3 is installed, the angle between the first guide arm 23 and the cavity is reduced, so that the first guide arm 23 applies a lateral force to the position of the second limit arm 32 during the longitudinal movement along the second slide rail 321, thereby reducing the jitter of the sleeve 3, and also increasing the damping and reducing the amplitude. The first elastic member 4 and the second elastic member 6 can both be set as springs to prevent the simple harmonic motion of the spring from repeatedly puncturing the wound.

[0033] Further, such as Figure 7 and Figure 8 As shown, at least two second limit blocks 52 are fixedly arranged on the surface of the needle assembly 5, and a third slide rail 322 is provided on the inner wall of the second limit arm 32. The second limit block 52 is slidably connected to the third slide rail 322. Optionally, as Fig.10 As shown, the second limit block 52 includes a hollow strip shell 524, one end of which is provided with a notch, and a plurality of elastic springs 523 are arranged in the cavity of the strip shell 524. The extrusion block 521 passes through the position of the strip shell, and the elastic spring 523 acts on the slide plate 522, and the slide plate is fixedly connected to the extrusion block 521, wherein the extrusion block 521 contacts the third slide rail 322, thereby reducing the jitter of the needle assembly 5 during the sliding process.

[0034] Preferably, in order to enhance the stability of the movement of the needle assembly 5, the second limiting arm 32 and / or the first limiting arm 31 are elastic clamping arms, which are deformed toward the needle assembly 5 to squeeze the needle assembly 5. During the longitudinal movement of the needle assembly 5 in the sliding sleeve 3, the second limiting arm 32 and / or the first limiting arm 31 clamps the needle assembly 5 and applies a lateral force, thereby making the needle assembly 5 more stable during the movement.

[0035] Further, such as Figure 4 As shown, in order to facilitate the use of the present invention, two anti-skid grooves 21 are provided on the surface of the shell 2, and a rubber layer is provided on the outer surface of the anti-skid groove 21. Medical personnel can enhance the stability of finger clamping by placing their fingers at the position of the anti-skid groove 21.

[0036] Further, such as Figure 8As shown, in order to adjust the exposed length of the puncture needle, the needle assembly 5 includes a puncture needle and a mounting seat for installing the puncture needle. The mounting seat is provided with a mounting groove with a thread on the inner wall. The surface of one end of the puncture needle is provided with a thread, and the other end is set in a triangular shape; it can quickly pierce the skin. The end of the puncture needle with a thread is threadedly connected to the mounting groove. By rotating the puncture needle, the position of the puncture needle and the mounting groove can be changed, thereby changing the exposed length of the puncture needle.

[0037] Optionally, in order to facilitate the adjustment of the exposed length of the puncture needle, the mounting seat includes a mounting tube and a mounting shell, wherein the mounting tube is detachably connected to the mounting shell, and the mounting groove is arranged at the position of the mounting shell, so that the mounting tube can be removed and the puncture needle can be rotated, wherein the mounting tube has a protective effect on the puncture needle to prevent the puncture needle from being bent.

[0038] Furthermore, if Fig. 9 As shown, the present invention also includes a hollow needle cap 1, an end of the shell 2 close to the perforation is arranged as a first connecting end, a second connecting end is arranged on the inner wall of the needle cap 1, the shell 2 and the needle cap 1 are detachably connected through the cooperation of the first connecting end and the second connecting end, a boss is arranged inside the cavity of the needle cap 1, and the boss is arranged on the side wall surface away from the second connecting end, wherein, when the needle cap 1 and the shell 2 are installed together, the boss contacts the perforation, which completely seals the perforation, thereby preventing the puncture needle from being contaminated when it is not in use.

[0039] In summary, compared with the prior art, the present invention has a compact structure and high safety, and the needle assembly can stably slide in the inner cavity of the shell, thereby minimizing trauma to the patient.

[0040] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A disposable peripheral blood collection needle, characterized in that: include: The housing is provided with a first cavity, one end of which is provided with a through hole, and a first channel is formed in the first cavity; a sliding sleeve, arranged at the position of the first cavity, slidably connected to the first channel, the sliding sleeve being arranged with a second cavity, a second channel provided with a needle outlet formed in the second cavity, the needle outlet of the second channel being aligned with the perforation, and one end of the sliding sleeve passing through the perforation; A first elastic member, arranged at the position of the second cavity; A needle assembly equipped with a puncture needle is arranged with a first end and a second end, the first end of the needle assembly is sleeved with the first elastic member, and the needle assembly is slidably connected to the second channel, and the puncture needle is aligned with the needle outlet of the second channel; A second elastic member is arranged to be sleeved and connected to the second end of the needle assembly; wherein at least two first limit blocks are fixedly arranged on the surface of the needle assembly, and two first limit arms are fixedly arranged on one end of the sliding sleeve away from the needle outlet, a sliding rail is opened on the surface of the first limit arm, and an end of the first limit arm that does not contact the sliding sleeve is provided with an inclined surface bent toward the inner wall direction of the first cavity to form an opening, a first limit groove is provided at the inclined surface position of the first limit arm, and an end of the first cavity close to the opening of the first limit arm is provided with a protrusion, and the first limit block cooperates with the first limit groove to complete the limiting of the needle assembly, and when a force is applied to the sliding sleeve so that the sliding sleeve moves in the first channel in a direction close to the protrusion, the protrusion contacts and squeezes the upper inclined surface of the limit arm, and the inclined surface bends toward the inner wall direction of the first cavity, and the size of the opening becomes larger. At this time, the first limit block does not contact the first limit groove, and the needle assembly moves toward one end of the needle outlet in the second channel under the action of the second elastic member; The housing comprises an outer shell provided with a first cavity and a back cover, the through hole is arranged at one end of the outer shell, an opening is arranged at one end of the outer shell away from the through hole, and the back cover is arranged at the position of the opening of the outer shell to seal the opening; Wherein, the protrusion is arranged at the position of the rear cover; A first guide arm is disposed on the inner wall of the first cavity of the housing, at least two second limit arms are disposed on one end of the sliding sleeve connected to the first limit arm, a second slide rail is disposed on the outer side wall of the second limit arm, and the second slide rail is slidably connected to the first guide arm; The outer shell surface is provided with two anti-skid grooves, and the outer surfaces of the anti-skid grooves are provided with a rubber layer.

2. A disposable distal blood collection needle as claimed in claim 1, characterized in that: At least two second limiting blocks are fixedly arranged on the surface of the needle assembly, a third slide rail is provided on the inner side wall of the second limiting arm, and the second limiting block is slidably connected to the third slide rail.

3. A disposable distal blood collection needle as claimed in claim 2, characterized in that: The second limiting arm and / or the first limiting arm is an elastic clamping arm, which is deformed toward the needle assembly to squeeze the needle assembly.

4. A disposable distal blood collection needle as claimed in claim 3, characterized in that: The needle assembly includes a puncture needle and a mounting seat for mounting the puncture needle. The mounting seat is provided with a mounting groove with a threaded inner wall. The surface of one end of the puncture needle is provided with a thread, and the other end is set in a triangular shape. Wherein, one end of the puncture needle provided with a thread is threadedly connected to the mounting groove.

5. A disposable distal blood collection needle as claimed in claim 4, characterized in that: The mounting seat includes a mounting tube and a mounting shell, wherein the mounting tube is detachably connected to the mounting shell, and the mounting groove is arranged at the position of the mounting shell.

6. A disposable distal blood collection needle as claimed in claim 2, characterized in that: It also includes a hollow needle cap, wherein one end of the shell close to the perforation is arranged as a first connecting end, the inner wall of the needle cap is arranged with a second connecting end, and the shell and the needle cap are detachably connected through the cooperation of the first connecting end and the second connecting end.

7. A disposable distal blood collection needle as claimed in claim 6, characterized in that: A boss is arranged inside the cavity of the needle cap, and the boss is arranged on the side wall surface away from the second connecting end, wherein when the needle cap is installed with the housing, the boss contacts the through hole and completely seals the through hole.

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