CN213189589U - Safety blood taking needle - Google Patents

Abstract

The utility model belongs to the technical field of blood taking needles, in particular to a safe blood taking needle, which comprises a tube body, a needle head, a needle sleeve and a return spring, wherein one end of the tube body is provided with a connecting port connected with an external conveying pipe, and the other end of the tube body is conical and is fixed and communicated with the needle head; the needle sleeve is hollow and cylindrical, the needle sleeve is sleeved on the tube body and is in sliding connection with the tube body, one side of the outer wall of the tube body is provided with a first semicircular groove, and one end of the tube body is provided with a limiting bulge; a second semicircular groove is formed in the inner wall of the needle sleeve, a limiting part is arranged at one end of the needle sleeve, and the limiting part is located at the tail end of the second semicircular groove; when the needle sleeve shields the needle, the reset spring is in a natural state; one end of the reset spring is fixedly connected with the limiting part, and the other end of the reset spring is fixedly connected with the bottom side wall of the limiting bulge; the safety blood taking needle of the utility model can avoid the problem that the needle head accidentally injures medical care personnel; meanwhile, only the limiting protrusion needs to be pressed after blood sampling is finished, and the tube body can automatically drive the needle head to exit the outside of the patient body under the action of the reset spring.

Description

Safety blood taking needle

Technical Field

The utility model belongs to the technical field of the blood taking needle, specifically speaking relates to a safe blood taking needle.

Background

The blood sampling and testing technology is well developed at present, but the purpose of drawing a conclusion without taking blood from a patient body is not achieved, and the initial process of testing is completed by a blood taking needle and a blood taking tube, so the blood taking needle is one of the medical device products which are sold in the largest amount in the world at present. However, it is worth noting that the human body injury accidents of blood sampling needles caused by needle breakage or improper operation of medical staff in hospitals all over the world occur millions of times every year. Statistical data published by the American medical society show that about 100 million medical workers are accidentally pricked by a blood taking needle every year in the United states alone, and at least thousands of the medical workers are infected by hepatitis B virus, hepatitis C virus and AIDS virus attached to the needle. The first aid treatment cost for medical staff and patients who are pricked each time due to the breakage of the blood collection needle is $ 3000 per person.

Companies at home and abroad greatly invest research and development of safe blood sampling medical equipment in succession, the safe blood sampling needles on the current market are very many, and the safe blood sampling equipment has many defects: firstly, the production cost is very high; secondly, the production process is complex; thirdly, the production quality is difficult to guarantee; fourthly, the medical staff is complicated to operate; and fifthly, the safety function is difficult to guarantee.

Currently, before a common disposable blood taking needle is used, a needle needs to be sleeved with a needle sleeve to protect the needle, for example, to prevent the needle from being bent or collided. When the blood sampling needle sleeve is used, the puncture danger is easily caused when the needle sleeve is pulled out, but the real danger is in the treatment stage after the blood sampling is finished, after the blood sampling needle sleeve is pulled out from the body of a blood-sampled person, when the blood sampling needle sleeve is discarded and treated, the blood sampling needle sleeve is easily punctured and damaged, and serious consequences such as infection of medical staff are caused.

Simultaneously, the blood sampling syringe needle in market is after the blood sampling is accomplished, and the blood sampling syringe needle can not return automatically or extract for medical personnel need concentrate on and extract the syringe needle, if extract improper or extract speed at the excessive speed, still can make the patient feel severe pain, make this type of blood sampling syringe needle use inconvenient.

SUMMERY OF THE UTILITY MODEL

For remedying the defects of the prior art, the utility model provides a safe blood taking needle, which solves the problems that the needle head of the blood taking needle easily stabs medical staff after the blood taking is completed, the needle head can not be automatically pulled out after the blood taking is completed and the needle head is pulled out quickly after the blood taking is completed, so that the patient feels severe pain.

In order to solve the technical problem, the utility model discloses a technical scheme be: a safe blood taking needle comprises a tube body, a needle head, a needle sleeve and a return spring, wherein one end of the tube body is provided with a connecting port connected with an external conveying pipe, the other end of the tube body is conical, and the end of the tube body is fixed and communicated with the needle head; the needle sleeve is in a hollow cylindrical shape, the needle sleeve is sleeved on the tube body and is in sliding connection with the tube body, and the length of the needle sleeve in the sliding direction of the tube body is longer than that of the needle head; the axial length of the tube body is longer than that of the needle head;

a first semicircular groove is formed in one side of the outer wall of the tube body in the axial direction, a limiting protrusion is arranged at one end of the tube body in the axial direction and close to the needle head, and the limiting protrusion and the first semicircular groove are located on the same straight line; a second semicircular groove is formed in the inner wall of the needle sleeve along the axial direction of the needle sleeve, a limiting part is arranged at one end of the needle sleeve away from the needle head in the axial direction, and the limiting part is positioned at the tail end of the second semicircular groove; the edges of the first semicircular groove and the second semicircular groove are matched and combined into a circular hole-shaped groove; the reset spring is positioned in a circular hole-shaped groove formed by combining the first semicircular groove and the second semicircular groove, the reset spring is in a natural state when the needle sleeve shields the needle head, one end of the reset spring is fixedly connected with the limiting part, and the other end of the reset spring is fixedly connected with the side wall of the bottom of the limiting protrusion;

the outer wall of one end of the needle sleeve is provided with a first flat groove and a second flat groove which is symmetrical to the first flat groove; the bottom of the first flat groove and the bottom of the second flat groove are back to back, the first flat groove is located at the end of the second semicircular groove, the groove wall of the first flat groove protrudes out of the extension line of the imaginary part of the first semicircular groove, a limiting hole matched with the limiting protrusion is formed in the first flat groove, and the limiting protrusion is used for buckling the limiting hole to limit the needle sleeve to slide on the tube body when the needle is completely exposed outside the needle sleeve. When the blood sampling device works, when blood sampling is needed, one hand holds the end part of the tube body, the other hand holds the surface of the needle sleeve, the needle sleeve is pulled forcefully to enable the needle sleeve to be sleeved on the tube body, after the needle sleeve is completely retracted onto the tube body, at the moment, the reset spring is in a stretching state, the limiting of the needle sleeve is realized after the limiting bulges are buckled into the limiting holes, at the moment, the needle head is completely exposed outside the needle sleeve, when the blood sampling is carried out, the thumb and the forefinger respectively pinch the first flat groove and the second flat groove, the needle head is aligned to the part of a patient needing the blood sampling to carry out the blood sampling, after the blood sampling is finished, the needle head can be selected to be manually pulled out firstly, the limiting bulges can be selected to be manually pressed firstly to enable the limiting bulges to be separated from the limiting holes, under the elastic action of the reset spring, the tube body automatically withdraws outside the needle sleeve, the needle head is automatically, and also protects the needle.

The side wall of the first flat groove is provided with a sleeve withdrawing piece parallel to the bottom of the first flat groove; the sleeve withdrawing piece is of a flat hook-shaped structure, and a ball head is arranged at the end part of the hook-shaped structure of the sleeve withdrawing piece; the bulb is close to spacing hole and is located spacing hole centre of rotation direction, moves back one section that external member and a parallel groove lateral wall are connected and is A position, is located another lateral part of A position and is divided into B position. When the safety blood taking needle is in operation, after the limiting bulge is buckled into the limiting hole, when the needle is required to be inserted into a patient, fingers are held between the A position and the B position by hands, so that the ball head cannot extrude the limiting bulge, the groove walls of the first flat groove and the second flat groove are also beneficial to being held by hands without sliding, a doctor can conveniently hold the safety blood taking needle to be inserted into the patient, the ball head can be pressed into the limiting hole to extrude the limiting bulge when the B position is held by hands, so that the limiting bulge is separated from the limiting hole, the tube body drives the needle to automatically return under the action of the reset spring, the needle is shielded by the needle sleeve, in the process, the B position is held by hands, the groove bottom of the first flat groove can be pressed to deform, the limiting bulge can be blocked to slide slowly at the groove bottom wall of the first flat groove when the limiting bulge slides, after the limiting bulge completely leaves the first flat groove, the needle is separated from the patient, the needle tube body drives the needle to automatically and quickly return, so that the needle can be safely pulled out when being automatically pulled out of the body of a patient, the pain of the patient is reduced, and the energy consumed by a doctor for pulling out the needle is reduced.

And a convex rib is arranged at one end of the sleeve withdrawing piece close to the bending part. During operation, through setting up protruding muscle, can increase the deformation of hand according to a flat tank bottom wall when moving back the external member to the sliding speed of spacing arch in a flat tank bottom wall of reduction that can be better improves the syringe needle and is pulled out the internal security of patient automatically, has improved the result of use of safe blood taking needle.

The bottom of the first flat groove comprises a flat section and an arc-shaped section which is smoothly connected with the flat section, the flat section is positioned at one end with the needle head direction, and the arc-shaped section is close to the convex rib; the limiting hole is located on the flat section and is a through hole. When the needle sleeve is in work, the arc section is a turning point of the limiting bulge on the needle sleeve from slow to fast sliding, and is also a starting end of the limiting bulge which accelerates sliding after the needle automatically exits from the body of a patient, so that the purpose of setting the flat section is to enable the limiting bulge to smoothly exit from the flat section, thereby being beneficial to the safety of the needle and reducing the pain of the patient.

The edge of the limiting hole on one side of the flat section, which is close to the arc-shaped section, is of a stepped structure. When the safety blood taking needle works, the stepped structure is arranged, the situation that the limiting protrusion is accidentally separated from the limiting hole can be avoided, and the stepped structure at the edge of the limiting hole is used as a two-defense line for the limiting protrusion to be accidentally separated from the limiting hole, so that the use safety of the safety blood taking needle is improved.

The limiting bulge comprises a barrel-shaped column sleeve, a first spring and a cylinder; the cylinder is vertically fixed at the end part of the pipe body; the column sleeve is sleeved on the column and is in sliding connection with the column; the first spring is positioned in the column sleeve, one end of the first spring is fixedly connected with the end part of the inner wall of the column sleeve, and the other end of the first spring is fixedly connected with the end part of the cylinder. During operation, when the staff pressed spacing arch and made spacing arch break away from spacing hole or the staff pressed and moved back the external member and made the spacing protruding of cover piece extrusion, because of post sleeve and cylinder sliding connection on the spacing arch, consequently, press the post sleeve, it is spacing protruding to make the people extrude, it is more convenient to make spacing arch withdraw from spacing hole, on the other hand, the post sleeve is hemispherical with the gliding one end of a half slot, post sleeve and cylinder pass through a spring coupling, also can reduce the resistance that spacing arch received sliding on a half slot, because when spacing arch was obstructed, the post sleeve was for returning to the cylinder is interior automatically, thereby reduce the resistance.

Compared with the prior art, the utility model discloses can obtain including following technological effect:

1. the safety blood taking needle of the utility model can shield the needle head by pressing the limiting bulge after blood taking, thereby avoiding the problem that the needle head accidentally injures medical care personnel after the safety blood taking needle is used; and simultaneously, the utility model discloses a safe blood sampling syringe needle need not the manual syringe needle of extracting after accomplishing the blood sampling, only need press spacing protruding messenger spacing protruding break away from spacing hole after, the body can drive the syringe needle automatically and withdraw from the patient external, simple and convenient under reset spring effect.

2. The utility model discloses a set up a plain groove and No. two plain grooves, the cell wall of a plain groove and No. two plain grooves also is favorable to the people to hand and can not slide for the doctor can be very convenient hold safe blood taking needle and insert the patient internal.

3. The utility model discloses hold between the fingers B position at the staff, can make the tank bottom of a straight flute pressed down the deformation, can be so that the spacing arch is blocked earlier slowly to slide when the tank bottom wall department of a straight flute slides, after spacing arch left a straight flute completely, the syringe needle breaks away from the internal back of patient, the syringe needle body drives the automatic quick return of syringe needle, thereby make the syringe needle can realize safely extracting by automatic extraction patient internal time, and reduced the pain that the patient receives, reduced the energy that the doctor consumes of pulling out the needle again.

4. The utility model discloses an arc section is spacing protruding by the turning point to the rapid draing at a slow speed on the needle cover, also is that the syringe needle withdraws from the gliding top with higher speed of spacing arch in patient's internal back automatically, consequently, sets up the aim at of flat section, makes spacing arch withdraw from for the mild in flat section department, is favorable to moving back the security of syringe needle, reduces patient's painful sense.

Of course, it is not necessary for any product to achieve all of the above-described technical effects simultaneously.

Drawings

FIG. 1 is a schematic view of the needle shield of the present invention;

FIG. 2 is a cross-sectional view taken at X-X with respect to FIG. 1;

FIG. 3 is a schematic structural view of the needle of the present invention when it is detached from the needle sheath;

FIG. 4 is an enlarged view at C with respect to FIG. 3;

the needle sleeve comprises a pipe body 1, a connecting port 11, a first semicircular groove 12, a limiting protrusion 13, a column sleeve 131, a column 132, a needle 2, a needle sleeve 3, a second semicircular groove 31, a first flat groove 32, a flat section 321, an arc section 322, a second flat groove 33, a limiting hole 34, a step-shaped structure 341, a return spring 4, a sleeve withdrawing part 5, a ball head 51 and a convex rib 52.

Detailed Description

The following detailed description will be made with reference to the accompanying drawings and examples, so that how to implement the technical means of the present invention to solve the technical problems and achieve the technical effects can be fully understood and implemented.

As shown in fig. 1 to 4, the safety blood taking needle of the present invention comprises a tube body 1, a needle 2, a needle sheath 3, and a return spring 4, wherein one end of the tube body 1 is provided with a connection port 11 connected to an external delivery pipe, and the other end of the tube body 1 is conical and is fixed and communicated with the needle 2; the needle sleeve 3 is hollow and cylindrical, the needle sleeve 3 is sleeved on the tube body 1, the needle sleeve 3 is connected with the tube body 1 in a sliding manner, and the length of the needle sleeve 3 in the sliding direction of the tube body 1 is longer than that of the needle head 2; the axial length of the tube body 1 is longer than that of the needle head 2;

a first semicircular groove 12 is formed in one side of the outer wall of the tube body 1 in the axial direction, a limiting protrusion 13 is arranged at one end of the tube body 1 in the axial direction and close to the needle head 2, and the limiting protrusion 13 and the first semicircular groove 12 are located on the same straight line; a second semicircular groove 31 is formed in the inner wall of the needle sleeve 3 along the axial direction of the needle sleeve 3, a limiting part is arranged at one end of the needle sleeve 3 away from the needle head 2 in the axial direction, and the limiting part is positioned at the tail end of the second semicircular groove 31; the edges of the first semicircular groove 12 and the second semicircular groove 31 are matched and combined into a circular hole-shaped groove; the reset spring 4 is positioned in a circular hole-shaped groove formed by combining the first semicircular groove 12 and the second semicircular groove 31, the reset spring 4 is in a natural state when the needle sleeve 3 shields the needle head 2, one end of the reset spring 4 is fixedly connected with the limiting part, and the other end of the reset spring 4 is fixedly connected with the bottom side wall of the limiting protrusion 13;

the outer wall of one end of the needle sleeve 3 is provided with a first flat groove 32 and a second flat groove 33 which is symmetrical to the first flat groove 32; the bottom of the first flat groove 32 and the bottom of the second flat groove 33 are back to back, the first flat groove 32 is located at the end of the second semicircular groove 31, the groove wall of the first flat groove 32 protrudes out of the extension line of the imaginary part of the first semicircular groove 12, a limiting hole 34 matched with the limiting protrusion 13 is arranged on the first flat groove 32, and the limiting protrusion 13 is used for buckling the limiting hole 34 to limit the needle sleeve 3 to slide on the tube body 1 when the needle 2 is completely exposed out of the needle sleeve 3. When the blood sampling device works, when blood sampling is needed, one hand holds the end part of the tube body 1, the other hand holds the surface of the needle sleeve 3, the needle sleeve 3 is pulled forcefully to be sleeved on the tube body 1, after the needle sleeve 3 is completely retracted onto the tube body 1, at the moment, the reset spring 4 is in a stretching state, the needle sleeve 3 is limited until the limiting bulge 13 is buckled into the limiting hole 34, at the moment, the needle head 2 is completely exposed out of the needle sleeve 3, when the blood sampling is carried out, the first flat groove 32 and the second flat groove 33 are respectively pinched by a thumb and a forefinger, the needle head 2 is aligned to the part of a patient needing the blood sampling to carry out the blood sampling, after the blood sampling is finished, the needle head 2 can be selected to be pulled out manually, the limiting bulge 13 can be selected to be pressed manually firstly to be separated from the limiting hole 34, under the elastic action of the reset spring 4, the tube body 1 automatically withdraws out of the needle sleeve 3, the needle head 2 can be, thereby the needle sleeve 3 shields the needle 2, the needle 2 is prevented from hurting people, and the needle 2 is protected at the same time.

The side wall of the first flat groove 32 is provided with a sleeve withdrawing piece 5 parallel to the bottom of the first flat groove 32; the sleeve withdrawing piece 5 is of a flat hook-shaped structure, and a ball head 51 is arranged at the end part of the hook-shaped structure of the sleeve withdrawing piece 5; the ball head 51 is close to the limiting hole 34 and is located in the direction of the rotation center of the limiting hole 34, one section of the sleeve withdrawing part 5 connected with the side wall of the first flat groove 32 is a position A, and the other side part located on the position A is a position B. When the safety blood taking needle is in operation, after the limiting protrusion 13 is buckled into the limiting hole 34, when the needle 2 needs to be inserted into a patient, fingers are pinched at the position A, the ball head 51 cannot extrude the limiting protrusion 13 when the hands pinch the position A, the groove walls of the first flat groove 32 and the second flat groove 33 are also beneficial to being held by hands without sliding, so that a doctor can conveniently hold the safety blood taking needle to be inserted into the patient, the hand pinches the position B, the ball head 51 can be pressed into the limiting hole 34 to extrude the limiting protrusion 13, the limiting protrusion 13 is separated from the limiting hole 34, the tube body 1 drives the needle 2 to automatically return under the action of the reset spring 4, the needle 2 is shielded by the needle sleeve 3, in the process, the hand pinches the position B, the groove bottom of the first flat groove 32 can be pressed to deform, the limiting protrusion 13 can be blocked to slowly slide at first when sliding at the groove bottom wall of the first flat groove 32, after spacing arch 13 left No. one flat groove 32 completely, syringe needle 2 breaks away from the internal back of patient, and syringe needle 2 body 1 drives the automatic quick return of syringe needle 2 to make syringe needle 2 can realize extracting safely when being extracted the patient by the automation, and reduced the pain that the patient receives, reduced the energy that the doctor consumes again that extracts the needle.

One end of the withdrawing sleeve piece 5 close to the bending is provided with a convex rib 52. During operation, through setting up protruding muscle 52, can increase the deformation of hand according to a flat groove 32 bottom end wall when moving back external member 5 to the sliding speed of spacing arch 13 at a flat groove 32 bottom end wall of reduction that can be better improves syringe needle 2 and has been pulled out the internal security of patient by the automation, has improved the result of use of safe blood taking needle.

The bottom of the first flat groove 32 comprises a flat section 321 and an arc section 322 smoothly connected with the flat section 321, the flat section 321 is positioned at one end with the needle 2 direction, and the arc section 322 is adjacent to the convex rib 52; the limiting hole 34 is located on the flat section 321, and the limiting hole 34 is a through hole. When the needle sleeve 3 is in operation, the arc-shaped section 322 is a turning point of the limiting protrusion 13 sliding on the needle sleeve 3 from slow speed to fast speed, and is also an initial end of the limiting protrusion 13 sliding with acceleration after the needle 2 automatically exits from the body of a patient, so that the flat section 321 is arranged to enable the limiting protrusion 13 to exit smoothly at the flat section 321, thereby being beneficial to the safety of the needle 2 and reducing the pain of the patient.

The edge of the limiting hole 34 on the flat section 321 near one side of the arc section 322 is a stepped structure 341. During operation, the stepped structure 341 is arranged, the situation that the limiting protrusion 13 is accidentally separated from the limiting hole 34 can be avoided, and the stepped structure 341 at the edge of the limiting hole 34 is used as a second defense line for the limiting protrusion 13 to be accidentally separated from the limiting hole 34, so that the use safety of the safety blood taking needle is improved.

The limiting bulge 13 comprises a barrel-shaped column sleeve 131, a first spring and a column 132; the cylinder 132 is vertically fixed at the end of the tube body 1; the column sleeve 131 is sleeved on the column 132, and the column sleeve 131 is connected with the column 132 in a sliding manner; the first spring is located in the column sleeve 131, one end of the first spring is fixedly connected with the end portion of the inner wall of the column sleeve 131, and the other end of the first spring is fixedly connected with the end portion of the column 132. During operation, when the staff pressed spacing arch 13 and made spacing arch 13 break away from spacing hole 34 or the staff pressed and moved back the external member 5 and made moving back external member 5 extrusion spacing arch 13, because of post cover 131 and cylinder 132 sliding connection on spacing arch 13, consequently, press post cover 131, will make the people extrude spacing arch 13, it is more convenient to make spacing arch 13 withdraw from spacing hole 34, on the other hand, post cover 131 is hemispherical with the gliding one end of a half slot 12, post cover 131 and cylinder 132 are through a spring coupling, also can reduce the resistance that spacing arch 13 slided on a half slot 12 and received, because when spacing arch 13 was obstructed, post cover 131 is for retracting in the cylinder 132 automatically, thereby reduce the resistance.

When the blood sampling device works, when blood sampling is needed, one hand holds the end part of the tube body 1, the other hand holds the surface of the needle sleeve 3, the needle sleeve 3 is pulled forcefully to be sleeved on the tube body 1, after the needle sleeve 3 is completely retracted onto the tube body 1, at the moment, the reset spring 4 is in a stretching state, the position of the needle sleeve 3 is realized after the position limiting bulge 13 is buckled into the position limiting hole 34, at the moment, the needle head 2 is completely exposed out of the needle sleeve 3, when the blood sampling is carried out, the first flat groove 32 and the second flat groove 33 are respectively pinched by a thumb and a forefinger, the needle head 2 is aligned to the position of a patient needing the blood sampling to carry out the blood sampling, after the blood sampling is finished, the position limiting bulge 13 is manually pressed to separate the position limiting bulge 13 from the position limiting hole 34, under the elastic action of the reset spring 4, the tube body 1 automatically withdraws out of the needle head 2 from the patient, at the time, the needle head, the needle head 2 is prevented from hurting people, and the needle head 2 is protected;

after the limiting protrusion 13 is buckled into the limiting hole 34, when the needle 2 needs to be inserted into a patient, fingers are pinched at the position A, the ball head 51 cannot extrude the limiting protrusion 13 when the hands pinch the position A, the groove walls of the first flat groove 32 and the second flat groove 33 are also beneficial to being held by hands and cannot slide, so that a doctor can conveniently hold a safe blood taking needle to be inserted into the patient, the doctor can pinch the position B, the ball head 51 can be pressed into the limiting hole 34 to extrude the limiting protrusion 13, the limiting protrusion 13 is separated from the limiting hole 34, the tube body 1 drives the needle 2 to automatically return under the action of the reset spring 4, the needle 2 is shielded by the needle sleeve 3, in the process, the hands pinch the position B, the groove bottom of the first flat groove 32 can be pressed to deform, the limiting protrusion 13 can be blocked to slowly slide when sliding at the groove bottom wall of the first flat groove 32, after spacing arch 13 left No. one flat groove 32 completely, syringe needle 2 breaks away from the internal back of patient, and syringe needle 2 body 1 drives the automatic quick return of syringe needle 2 to make syringe needle 2 can realize extracting safely when being extracted the patient by the automation, and reduced the pain that the patient receives, reduced the energy that the doctor consumes again that extracts the needle.

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The following description is of the preferred embodiment of the present invention, and is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the invention. The protection scope of the present invention is subject to the limitations defined by the appended claims.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims (6)

1. A safety blood taking needle is characterized in that: the blood transfusion tube comprises a tube body (1), a needle head (2), a needle sleeve (3) and a return spring (4), wherein one end of the tube body (1) is provided with a connecting port (11) connected with an external blood transfusion hose, and the other end of the tube body (1) is conical and is fixed and communicated with the needle head (2); the needle sleeve (3) is hollow and cylindrical, the needle sleeve (3) is sleeved on the tube body (1) and is in sliding connection with the tube body (1), and the length of the needle sleeve (3) in the sliding direction of the tube body (1) is longer than that of the needle head (2);

one side of the outer wall of the tube body (1) in the axial direction is provided with a first semicircular groove (12), one end of the tube body (1) in the axial direction and close to the needle head (2) is provided with a limiting bulge (13), and the limiting bulge (13) and the first semicircular groove (12) are positioned on the same straight line; a second semicircular groove (31) is formed in the inner wall of the needle sleeve (3) along the axial direction of the needle sleeve (3), a limiting part is arranged at one end, away from the needle head (2), of the needle sleeve (3) in the axial direction, and the limiting part is located at the tail end of the second semicircular groove (31); the edges of the first semicircular groove (12) and the second semicircular groove (31) are matched and combined into a circular hole-shaped groove; the reset spring (4) is positioned in a circular hole-shaped groove formed by combining the first semicircular groove (12) and the second semicircular groove (31), and the reset spring (4) is in a natural state when the needle sleeve (3) shields the needle head (2); one end of the reset spring (4) is fixedly connected with the limiting part, and the other end of the reset spring (4) is fixedly connected with the limiting bulge (13);

the outer wall of one end of the needle sleeve (3) is provided with a first flat groove (32) and a second flat groove (33) which is symmetrical to the first flat groove (32); the bottoms of the first flat groove (32) and the second flat groove (33) are back to back, the first flat groove (32) is positioned at the end part of the second semicircular groove (31), the groove wall of the first flat groove (32) protrudes out of the extension line of the imaginary part of the first semicircular groove (12), and a limiting hole (34) matched with the limiting protrusion (13) is arranged on the first flat groove (32); the limiting protrusion (13) is used for buckling the needle head (2) with the limiting hole (34) to limit the needle sleeve (3) to slide on the tube body (1) when the needle sleeve (3) is completely exposed outside the needle sleeve (3).

2. A safety lancet according to claim 1, characterised in that: the side wall of the first flat groove (32) is provided with a sleeve withdrawing piece (5) which is parallel to the groove bottom of the first flat groove (32); the sleeve withdrawing piece (5) is of a flat hook-shaped structure, and a ball head (51) is arranged at the end part of the hook-shaped structure of the sleeve withdrawing piece (5); the ball head (51) is close to the limiting hole (34) and is positioned in the direction of the rotation center of the limiting hole (34).

3. A safety lancet according to claim 2, characterised in that: and a convex rib (52) is arranged at one end, close to the bending, of the sleeve withdrawing piece (5).

4. A safety lancet according to claim 3, characterised in that: the bottom of the first flat groove (32) comprises a flat section (321) and an arc section (322) smoothly connected with the flat section (321), the flat section (321) is positioned at one end in the direction of the needle (2), and the arc section (322) is adjacent to the convex rib (52); the limiting hole (34) is positioned on the flat section (321).

5. A safety lancet according to claim 4, wherein: the edge of the limiting hole (34) on one side of the flat section (321) close to the arc section (322) is of a stepped structure (341).

6. A safety lancet according to claim 1, characterised in that: the limiting bulge (13) comprises a barrel-shaped column sleeve (131), a first spring and a column (132); the cylinder (132) is vertically fixed at the end part of the pipe body (1); the column sleeve (131) is sleeved on the column (132), and the column sleeve (131) is connected with the column (132) in a sliding manner; the first spring is positioned in the column sleeve (131), one end of the first spring is fixedly connected with the end part of the inner wall of the column sleeve (131), and the other end of the first spring is fixedly connected with the end part of the column (132).

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