CN113100763A - Safe vein blood taking needle capable of automatically retracting and destroying - Google Patents

Abstract

The invention provides an automatic needle retracting and self-destroying safety venous blood taking needle, which comprises a puncture needle, a catheter, a tail needle, needle wings and a needle cylinder, wherein the puncture needle and the tail needle are hermetically connected with two ends of the catheter, so that blood can enter the catheter through the puncture needle and then flow out of the tail needle; and the hollow part is clamped to enter the hollow needle wing to realize the purpose of fixing the puncture needle entering the needle cylinder body. The device enables the syringe to perform functions without being placed on the operating platform through the setting of the syringe which is not separated, thereby increasing the needle retracting efficiency of the blood taking needle and reducing the possibility of pollution of the operating platform and the blood taking needle.

Description

Safe vein blood taking needle capable of automatically retracting and destroying

Technical Field

The invention relates to the field of medical instruments, in particular to a safe venous blood taking needle capable of automatically retracting and destroying.

Background

Venous blood sampling is a method commonly used in medicine to verify the normality of a patient's body fluids. The venous blood sampling method is to extract a certain amount of venous blood through a needle tube to detect physiological and biochemical indexes such as blood routine, liver/kidney function, hepatitis B, two and a half, and the like, and is the most widely applied vacuum back suction blood sampling method at present. The vacuum back-suction blood sampling method realizes that blood automatically flows into the collecting tube by depending on the pressure difference between the vacuum environment in the collecting tube and the human body, and the detection purpose can be realized by only collecting a small amount of blood once.

In the process of venous blood collection, the blood collection needle is most commonly used, and the blood collection needle is used for puncturing a vein to collect blood. The collection needle is held and stuck fixedly by the disinfection hand of medical personnel in a scattered form in the blood collection process, and before puncture, the tail end of the collection needle can be punctured by manual touch. After the puncture is successful, the distal end of the puncture needle is stuck by the medical adhesive tape to realize the fixation of the collection needle and the blood collection is carried out by holding the tail needle. After blood collection is finished, the medical personnel still need to touch the puncture needle to carry out the operation that the needle body removed.

Chinese patent of invention with an authorization publication number of CN102293655A proposes a vacuum negative pressure blood taking needle sleeve and a vacuum negative pressure blood taking needle formed by the same, which includes a blood taking needle sleeve, wherein an track groove for moving the blood taking needle is formed on the blood taking needle sleeve, and two ends of the track groove are respectively provided with a positioning clamping groove. The track groove comprises a main track groove positioned in the middle section of the blood taking needle sleeve and a track groove inlet positioned at the end part of one end of the blood taking needle sleeve, and the track groove inlet is positioned on one side of the main track groove and is communicated with the main track groove through a connecting section. However, the groove structure of the main track of the device is complex, bacteria are easy to infect and breed, the device is not favorable for repeated use, and the cost is too high if disposable use is adopted. Chinese patent application No. CN103338702A relates to a lancet holder and a lancet device having the same, including a holder body portion having a lancet mounting groove formed at one end thereof for mounting a lancet, and accommodating the lancet; and elastic fixing portions formed in pairs on inner circumferential surfaces of the needle holder body portion facing each other, for elastically fixing the lancet so that the lancet housed in the needle holder body portion can be maintained in a vertical direction. When the blood sampling habit of the blood taking needle is not changed, the device realizes the hiding of the needle body in the vertical direction through the elastic part, but the pricking length is easily influenced by the spring to change due to the independent arrangement of the elastic part, and the straight tubular blood taking needle is not easy to operate.

Based on the above situation, chinese patent of invention granted with publication number CN205758575U provides a blood taking needle assembly of a butterfly-wing type safety type venous blood taking needle and a butterfly-wing type blood taking needle, comprising a needle and a needle tube, wherein the needle is slidably inserted into a blood taking input end of the needle tube, and a triggering rebound mechanism is arranged between an extending end of the needle extending into the needle tube and the needle tube, and is used for being clamped outside the needle in an axial or radial direction to limit the needle from retracting inwards the needle tube and enabling the needle to retract elastically inwards the needle tube by triggering; an elastic belt used for forcing the needle head to retract into the needle tube through elastic pulling force is arranged in the triggering rebound mechanism. The device realizes the self-movement of the needle body by triggering the rebounding mechanism, but the device still needs the needle cylinder to realize the hiding purpose. Chinese patent publication No. CN105473174B discloses a holder for a needle assembly of a retractable syringe, which includes a piston assembly and a barrel having a mounting member, the needle assembly including a retractable needle, a needle hub and a holder. A retractable needle is engageable with the piston assembly to facilitate retraction thereof. The needle hub is mountable to said mounting member of the barrel. The retainer includes a body and at least one retaining member extending distally from the body. The retaining member includes inwardly projecting side tabs to engage the retractable needle and thereby prevent the retractable needle from being accidentally moved proximally prior to retraction. The device allows hiding of the needle with the needle retracted into the holder, but problems with contamination of the needle in the holder during use may arise.

Aiming at the problems, the invention provides a safe vein blood taking needle capable of automatically retracting and destroying, which can realize the purposes of preventing puncture, pollution and secondary use by protecting a needle body.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a safe vein blood taking needle capable of automatically retracting and destroying, which comprises a puncture needle, a catheter, a tail needle, needle wings and a needle cylinder, wherein the puncture needle and the tail needle are hermetically connected with two ends of the catheter, so that blood can enter the catheter through the puncture needle and then flow out of the tail needle; and the hollow part is clamped to enter the hollow needle wing to realize the purpose of fixing the puncture needle entering the needle cylinder body.

According to a preferred embodiment, the hollow part is connected with the catheter in a manner that the hollow part can move between the puncture needle and the catheter, and is positioned on one side of the needle wing close to the tail needle, the hollow part is provided with an opening facing the puncture needle and capable of clamping the needle wing in a squeezing mode and the like, when the puncture needle slides into the needle cylinder body, the needle wing enters the hollow part from the far end of the opening in the same direction as the puncture needle enters the needle cylinder body, and the fixing of the puncture needle entering the needle cylinder body is realized through the fixing of the position and the direction of the needle wing by the hollow part.

According to a preferred embodiment, the needle wing can rotate along the second direction as a central axis to realize a first state of allowing the puncture needle to enter the needle cylinder and a second working state of fixing the puncture needle in the needle cylinder, wherein when the needle wing is in the first working state, the needle wing can enter the hollow in a mode of being parallel to the second direction when the puncture needle enters the needle cylinder, and can continuously keep a state of being capable of freely moving along the extending direction of the hollow in a mode of being capable of moving along the same direction as the puncture needle; the needle wing can get into the second operating condition from first operating condition through the mode of using the second direction as the center pin rotation, and when the needle wing was in the second operating condition, the needle wing was in order to form certain contained angle alpha's mode part or whole conflict fretwork edge with the second direction, and the needle wing is through the block fretwork and fixed the position that makes the pjncture needle of being connected with the needle wing get into the cylinder with fretwork relative position fixed.

According to a preferred embodiment, the barrel is provided with a length greater than the diameter of the catheter or needle tip in such a way as to allow the catheter or needle tip to slide inside it, wherein the needle diameter is β, the barrel diameter is γ, the needle edge is at a distance e from the barrel, and the barrel is designed in such a way that β +2 e < γ.

According to a preferred embodiment, epsilon should be less than delta based on the fact that blood will slide downward due to its own weight when the drop diameter of blood on the outer surface of the needle reaches delta.

According to a preferred embodiment, the proximal end of the inner wall of the cylinder near the opening is provided with a collecting groove for collecting liquid flowing from the distal end to the opening along the inner wall of the cylinder, and the collecting groove is a convex groove with the opening facing the distal end and capable of containing liquid flowing down from the inner wall of the cylinder.

According to a preferred embodiment, the hollowing is gradually enlarged from the proximal end to the distal end in a manner of abutting against the needle wing and pressing the needle wing when the needle wing is allowed to enter, wherein the width of the hollowed distal end is greater than the thickness of the needle wing to ensure that the needle wing can smoothly enter the hollowing, and based on the fact that the needle cylinder possibly has the problem that the puncture needle is separated from the needle cylinder when moving towards the puncture needle direction, the hollowing enables the needle wing to move from the distal end to the proximal end edge to abut against the hollow edge connection part in a manner that the length of the hollowing is not greater than the extension length of the needle cylinder, so that the.

According to a preferred embodiment, the opening of the needle for insertion and removal of the needle is provided with a stop catch matching the end of the needle, the stop catch comprising two parts that can be engaged or disengaged, respectively arranged outside the needle and the opening of the needle cylinder, in such a way as to keep the needle inside the needle cylinder stable and immobile when it is inserted into the needle cylinder.

According to a preferred embodiment, a safety venous blood collection needle includes two states of passive hiding and active hiding, the active hidden blood collection needle realizes the active hiding of a needle body by arranging a movable puncture needle, the passive hidden blood collection needle realizes the passive hiding of the needle body by arranging a needle cylinder for sleeving the puncture needle, wherein the needle cylinder enables the needle cylinder to accommodate the puncture needle without being separated from the blood collection needle by sleeving the blood collection needle or connecting the blood collection needle through a movable piece.

According to a preferred embodiment, the blood taking needle is provided with a connecting piece at one side of the needle wing close to the tail needle, the two ends of the connecting piece are connected with the blood taking needle and the needle cylinder, the needle cylinder is provided with a hollow part allowing the puncture needle to enter and exit, and the hollow part enables the puncture needle and the catheter to be deformed into the inside of the needle cylinder only through external force through the arrangement of the width smaller than the diameter of the puncture needle and the catheter in a mode that the hollow part can be formed into a whole or.

Drawings

FIG. 1 is a block diagram of one embodiment of the present invention;

FIG. 2 is a structural frame diagram of embodiment 1 of the present invention;

FIG. 3 is a structural view of embodiment 2 of the present invention;

FIG. 4 is a schematic structural view showing the width of the puncture needle and the cylinder in embodiment 3;

FIG. 5 is a view showing a structure of a rotary wing in embodiment 2;

FIG. 6 is a schematic view of the collecting tank structure in example 3.

Reference symbols of the drawings

100: the puncture needle 110: snap-fastener core

120: pressing head 130: telescopic spring

140: first link 150: second linkage member

160: first housing 170: magnetic part

200: the syringe 210: syringe body

220: and (3) hollowing out 230: movable sheet

240: collecting tank 250: stop buckle

260: hollowed-out edge 270: connection point

300: the catheter 400: tail needle

500: needle wing

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

Aiming at the problem that the blood taking needle cuts a sealing bag or stabs doctors and patients in the using process, the invention adopts a structure which can manually control whether the blood taking needle exposes the puncture needle 100 or not. The design of the present invention is based on the inventive improvement of the prior art use of a lancet as a wide range of lancet structures, as shown in figure 1. The puncture needle 100 can be hidden after the use by subjectively guiding the puncture needle 100 to move to the first shell 160 for hiding the inside and the outside of the puncture needle 100 or by arranging the needle cylinder 200 which can passively sleeve and hide the puncture needle 100, thereby avoiding the injury of the puncture needle 100 before and after the use to medical staff. The lancet can be prevented from being contaminated and injuring others in an unused state by hiding the puncture needle 100. Meanwhile, when the medical staff stops bleeding of the patient after the use, the puncture needle 100 can be hidden through simple control action, so that the puncture needle 100 stained with blood can be hidden and suspended to avoid polluting other positions. The concealment of the lancet 100 is divided into passive concealment and active concealment, wherein the active concealment is that the lancet 100 receives external forces through the components and actively enters the interior of the lancet housing. The passive concealment is to receive external stress from the case and actively engage the puncture needle 100 to conceal the puncture needle 100.

The structure of the casing of the trocar puncture needle 100 is the key in the passive hidden state, and according to the design of the following embodiment, the invention divides the casing into three modes of split type trocar, split type trocar and sliding type trocar, and the three modes can be totally or partially appeared on the trocar puncture needle 100 designed by the invention. Off-body sleeving is prior art, i.e. a separate needle cartridge 200 can be sleeved with puncture needle 100 or taken away from puncture needle 100. The method based on the separated type sleeving is easy to pollute, and medical staff and blood taking needles can be polluted based on the conditions of multiple surface touch and 200 small volumes of the needle cylinder in the process of taking the needle cylinder for the second time after the needle cylinder is placed on the operation table. The syringe 200 is narrow and difficult to take, and the cylindrical shape thereof is easy to roll over during placement and fall to the ground. In view of the above, the present invention is designed in such a manner that the puncture needle 100 is actively hidden or the cylinder 200 is not separated from the puncture needle 100. The proximal end and the distal end designed in the invention are opposite ends of any component, wherein the proximal end is the side close to an operator when the device is used, and the distal end is the side far away from the operator when the device is used.

After the use is finished, in order to prevent the contaminated blood taking needle from being used for other purposes, the blood taking needle should be capable of realizing self-destruction through operations of puncturing the catheter 300, separating the needle body from the catheter 300 and the like, so that the contaminated blood taking needle is prevented from being used for a second time. In view of the above, the present invention provides an automatic needle retracting and self-destroying safety lancet, which has a hook provided outside a housing, and a user engages a catheter 300 with the hook to make the catheter 300 touch a puncture needle 100 after being wound and fixed, thereby applying a force to make the puncture needle 100 puncture the catheter 300. The blood collection needle can realize that the puncture needle 100 penetrates out of the interior of the shell or extends into the interior of the shell through simple rotation or pressing operation, and meanwhile, the shell is provided with a structure which can enable the puncture needle 100 to puncture the conduit 300 or the puncture needle 100 to be separated from the conduit 300 through simple hanging and connecting actions, so that the self-destruction of the blood collection needle is realized. Based on the requirement of blood taking needle to sterile environment before using, the blood taking needle should be in the sealed environment that is covered and connects before not using, but when finishing using but medical personnel carry out other hemostasis disinfection operations to the patient, the needle body can be in and hidden or initiatively hide the state, but can not be in sterile condition, but it is provided with the part setting of placing the body fluid outflow of blood taking needle contact to prevent that body fluid from flowing polluted environment or human body. After the use and hemostasis are finished, the medical staff needs to damage the blood taking needle and then hide the puncture needle 100, and the blood taking needle is discarded.

Example 1

Based on the springback device mentioned in the prior art, it is only necessary to hide the puncture needle 100 after use, but still sleeve the needle cylinder 200 before use. The present invention relates to an automatic retracting safety lancet, which is a safety lancet formed by sheathing a lancet with a separate cylinder 200, and includes a first housing 160, a pressing structure, a first link 140, a second link 150, and a puncture needle 100, as shown in fig. 2. The lancet can be hidden inside the first case 160 when not used, and moved to the outside of the first case 160 when used. The snap structure, linkage and needle 100 can be disposed within the first housing 160. The puncture needle 100 is coupled to the first and second linkage members 140 and 150, and the pressing structure is coupled to the other end of the second linkage member 150 such that the pressing structure can move the first linkage member 140 in a first direction, which is a direction in which the first housing 160 extends, based on external pressure, and the first linkage member 140 abuts against the puncture needle 100, thereby moving the puncture needle 100 in the same direction.

The pressing structure includes a pressing head 120, a pressing core 110 and a retractable spring 130, which can receive external force to make the pressing structure generate a force applied in a first direction to move the second linkage 150 and the spring in the first direction, and further drive the puncture needle 100 connected to the first linkage 140. The detailed description of the embodiment of the pressing structure is provided in chinese patent publication No. CN110202977A, and is not repeated herein.

The second linkage member 150 is a movable housing that encloses the stationary puncture needle 100 and serves to stabilize the puncture needle 100 during movement. The second link member 150 is sleeved with the extension spring 130. Preferably, the second linkage member 150 interferes with the first linkage member 140 and can only move in portions of the first housing 160 that completely conceal the needle 100 and completely expose the needle 100.

The first linkage 140 can be an intermediate component for the tissue actuation structure and the needle 100, and has the functions of linking the needle 100 to move, maintaining the needle 100 in a static, pressure-resistant state, and the like. Preferably, the first linkage member 140 can be a rigid shutter that maintains the needle 100 in the same direction as the actuator. The inner wall of the first housing 160 is provided with a magnetic member 170, and the magnetic member 170 is located on one side of the first linkage member 140 close to the pressing structure. The minimum distance between the magnetic attraction member 170 and the first linkage member 140 can be 0, and the maximum distance should be the distance between the magnetic attraction member 170 and the first linkage member 140 to generate the magnetic attraction effect. The magnetic member 170 can stabilize the first linkage member 140 during the rebound process of the puncture needle 100, so that the first linkage member 140 does not generate an excessive movement except the rebound movement in the first direction, thereby ensuring the stability of the puncture needle 100 when entering the first housing 160. The first direction is an axial direction of the first housing 160 centered on its internal puncture needle.

The needle outlet of the first case 160 is provided with a sealing film when the unused puncture needle 100 is in a hidden state, based on the fact that the puncture needle 100 before use should be in a sterile state. The sealing membrane is fixedly connected to the first housing 160 to isolate the needle outlet from the external environment, thereby maintaining the sterile environment inside the first housing 160.

Since the puncture needle 100 needs to be exposed to puncture the meridians of the human body during use of the blood collection needle, the puncture needle 100 should penetrate through the hidden first housing 160, and therefore, the sealing film should be made of a material that the puncture needle 100 can easily puncture. The sealing film can keep the characteristics of flexibility and easy breaking while keeping the air, liquid, solid and various organisms in the external environment impermeable, and preferably can be a medical aluminum foil or a medical easy-to-tear film such as PP-PE-PET-PVC-PS.

In order to ensure that the sealing film acts to isolate the external environment, the sealing film at least covers the needle inlet and the edge of the needle inlet of the first housing 160, so as to achieve the purpose of sealing by being fixedly connected with the edge of the needle inlet.

Example 2

The casing can be sleeved on the puncture needle 100 by changing the movement mode of the casing aiming at the mode that the puncture needle 100 is hidden by moving. The present invention relates to a needle cylinder 200 with a hollow 220, wherein the needle cylinder 200 can be connected with a puncture needle 100, so that the needle cylinder 200 cannot be separated from the puncture needle 100 no matter the puncture needle 100 is sleeved on the needle cylinder 200, as shown in fig. 3. Syringe 200 includes a syringe body 210 and a cutout 220. The hollow 220 is disposed on the axial surface of the syringe body 210 along the second direction, and is configured as a narrow gap along the direction extending to the two ends of the opening of the syringe body 210. The opening of the hollow 220 is disposed at the edge of the syringe body 210, and the opening direction is the same as the direction in which the syringe body 210 allows the puncture needle 100 to enter. The syringe body 210 is a rigid cylinder that can wrap the puncture needle. The both ends of the cylinder body 210 are provided with circular ports allowing the catheter 300 and the puncture needle 100 to enter and exit, and the caliber of the circular ports is at least larger than the diameters of the puncture needle 100 and the catheter 300. This cylinder 200 can also coexist with the structure of embodiment 1 described above, in which case the cylinder 200 can have a function of preventing contamination, i.e., even if the puncture needle 100 is guided into the interior of the first casing 160 after the end of use, it has a possibility of contaminating blood by contacting a vein through which blood flows in a human body. Since blood is in a liquid form, there is a possibility that blood may drip or flow out from the inside of the first case 160 to contaminate a human body or a table surface on which the lancet is placed, based on the problem that the sealing film is broken when the puncture needle 100 is introduced into the inside of the first case 160. In view of the above problems, the present invention provides a syringe 200 that is detachably connected to a lancet without affecting the operation of a puncture needle 100, and that can separate the puncture needle 100 from the outside by simply sheathing the syringe 200 on the syringe body when the lancet finishes operating, wherein the second direction is a direction in which the puncture needle 100 enters the syringe 200 from the opening of the syringe 200.

The distal end of needle cartridge 200 and the distal end of puncture needle 100 are movably connected by movable piece 230, so that needle cartridge 200 can move at an arbitrary angle around the point of connection with puncture needle 100. The puncture needle 100 is provided with a needle wing 500 for fixing and engaging, and the needle wing 500 may be a sheet. The syringe 200 is provided with the fretwork 220 that the width is less than pjncture needle 100 and pipe 300 diameter but is greater than the wing of needle 500 width, and the width of fretwork 220 can guarantee that pjncture needle 100 and pipe 300 can not be from fretwork 220 roll-off, can make the wing of needle 500 block in fretwork 220 department through exogenic action simultaneously. To ensure that the hollow 220 can abut against the protruding wings 500 of the puncture needle 100, the length of the lateral hollow 220 should not be greater than the length of the needle cylinder 200. Needle 100 can enter laterally into barrel 200 through hollow 220.

To ensure that needle 100 entering barrel 200 cannot slide out of hollow 220, hollow edge 260 or the bulk vacuum of barrel 200 can be constructed of a material that deforms elastically. The puncture needle 100 can be pressed by external force to press the puncture needle 100 against the hollow edge 260, so that the hollow edge 260 is deformed, the area of the hollow 220 is increased, and the puncture needle 100 is allowed to enter.

The hollow 220 design allowing the puncture needle 100 to enter through the compression deformation can cause the problem that the edge of the cylinder 200 is polluted by the blood adhered to the puncture needle 100, therefore, the invention designs the spiral needle wing 500 to ensure that the hollow 220 can be fixed in the cylinder 200 under the condition that the size of the hollow 220 is far larger than that of the puncture needle 100, as shown in fig. 5. The needle wing 500 has two operation states, and the first operation state can be a parallel state in which the puncture needle 100 is allowed to enter the cylinder 200. The second working state is that the puncture needle 100 can not be separated from the needle cylinder 200 because the puncture needle is abutted against the hollow part 220 after being rotated. The cutouts 220 allow the direction of the needle 100 in and out. The two states of the twisted wings 500 are changed based on the relative positions of the puncture needle 100 and the cylinder 200. When the puncture needle 100 enters the needle cylinder 200 through the hollow 220 in the second direction, the needle wing 500 is displaced in the same direction as the puncture needle 100 in the second direction in a manner parallel to the hollow 220, and a part or all of the needle wing enters the needle cylinder 200. When the puncture needle 100 completely enters the needle cylinder 200 and needs to be in a fixed state, the needle wing 500 rotates by an angle α around the second direction as a central axis, so that part or all of the needle wing 500 butts against the hollow edge 260, and the fixation of the puncture needle 100 after entering the needle cylinder 200 is realized by the clamping fixation of the needle wing 500 and the hollow 220. Preferably, the two ends of the middle edge of the needle wing 500 are provided with first channels recessed towards the center, and the first channels can allow the hollow edge 260 to enter when the needle wing 500 is perpendicular to the hollow 220, so as to achieve the purpose of cross fixation.

Example 3

In view of the object of concealing puncture needle 100, needle cartridge 200 of the present invention can be moved by sliding or the like while being fitted to the tip of puncture needle 100 or catheter 300, and finally fitted to puncture needle 100, thereby achieving the object of concealing puncture needle 100. Based on the above requirements, the present invention adopts the design scheme that the cylindrical syringe 200 is sleeved at the end of the puncture needle 100 or the catheter 300. When needle 100 needs to be exposed, barrel 200 is slid in the direction in which catheter 300 extends adjacent to tail needle 400. When needle 100 needs to be concealed, barrel 200 is slid in a direction extending away from tail needle 400 along catheter 300. The cylinder body 210 has a straight cylindrical shape, and is provided with openings near the distal end of the puncture needle 100 and near the proximal end of the tail needle 400, for allowing the catheter 300 and the puncture needle 100 to enter and exit from both ends of the cylinder 200. The diameter of the distal end of the syringe body 210 near the puncture needle 100 is larger than the diameter of the proximal end of the syringe body 210 near the tail needle 400, so that the syringe body 210 forms a straight cylinder shape with two inclined sides. The syringe body 210 can be made of soft plastic. The syringe body 210 can be constructed of a transparent material to facilitate observation of the puncture needle 100 by a medical professional. Based on the internal design of syringe 200 in the prior art, it is found that blood contaminated by puncture needle 100 may only flow out from the distal end to the proximal end of puncture needle 100 and then out from syringe 200 when puncture needle 100 is used while being fitted to syringe 200 due to the distance between syringe 200 and puncture needle 100. Based on this, the inside of syringe 200 of the present invention can drain blood on the surface of puncture needle 100 and store the blood inside syringe 200. As shown in FIG. 4, the puncture needle 100 has a diameter β, the cylinder 200 has a diameter γ, the distance between the edge of the puncture needle 100 and the cylinder 200 is ε, and the cylinder 200 is designed so that β +2 ε < γ. The value of epsilon should be less than delta based on the fact that blood will slide downward due to its own weight when the drop diameter on the outer surface of needle 100 reaches delta. The above arrangement allows puncture needle 100 introduced into cylinder 200 not to touch cylinder 200 but allows blood that may flow downward to touch the inner wall of cylinder 200. The proximal end of the inner wall of the syringe 200 near the opening is provided with a collecting groove 240 which collects the liquid flowing from the distal end to the opening along the inner wall of the syringe 200, and the collecting groove 240 is a convex groove with the opening facing the distal end and can contain the liquid flowing down from the inner wall of the syringe 200.

The opening of barrel 200 into needle 100 is provided with a stop catch 250 that mates with the end of needle 100. The stop buckle 250 is provided with two separable parts which can be opened and closed and are respectively arranged at the tail end of the puncture needle 100 and the outside of the opening of the needle cylinder 200. When puncture needle 100 enters the interior of barrel 200, the end of puncture needle 100 fits into the opening of barrel 200. In one aspect, stop catch 250 allows proper access of needle 100 to the interior of barrel 200, i.e., prevents the distal end of needle 100 from abutting the distal end of barrel 200 and contaminating needle 100. A portion of the stop catch 250 should be disposed in the direction of the needle wing 500 close to the tail needle 400 to ensure that the needle wing 500 can enter the hollow 220. On the other hand, the two parts of the stop buckle 250 are folded to fixedly connect the puncture needle 100 and the syringe 200, so that the puncture needle 100 entering the syringe 200 is prevented from being separated from the syringe 200. Preferably, the stop catch 250 can be a magnetically attractive component, as shown in fig. 6.

The width of the hollow 220 is set to be varied in a gradient for the purpose of engaging the needle wing 500. The width of the opening of the hollow 220 can be slightly smaller than the thickness of the needle wing 500, so that the needle wing 500 needs to change the width of the hollow 220 through external force based on the elastic force of the syringe body 210, thereby allowing the needle wing 500 to enter. The width of the middle of the hollow 220 is from narrow to wide at the opening, to the widest at the middle, and then to the end clamping part. The width of the middle of the hollow 220 should be larger than the thickness of the needle wing 500, so that the needle wing 500 can smoothly slide from the opening to the end of the engagement. The narrow opening can prevent the needle wing 500 from sliding out from the opening of the hollow 220. The arrangement of the middle width enables the needle wing 500 to move smoothly in the hollow 220, reduces the force application time of clamping, and increases the operation efficiency. The width variation should be based on the corner-free curvature variation of the hollowed-out edge 260. The curved edge 260 changes the width of the hollow 220 to prevent the edge angle generated by the width change from affecting the moving efficiency of the needle wing 500. When the needle wing 500 slides to the end of the engagement, an external force with a force greater than the force required for sliding in the hollow 220 is applied again to make the needle wing 500 touch the hollow 220 until the needle wing 500 touches the end of the hollow 220 and is squeezed and clamped by the narrow part of the hollow 220, thereby completing the purpose of fixing the needle wing 500 and the needle body connected with the needle wing 500. The length of the hollow 220 should be less than the extension length of the syringe 200, so that the distal end of the hollow 220 has a joint 270. The joint 270 has a shielding function, so that the needle wing 500 does not slide out of the distal end of the hollow 220 when sliding in the hollow 220 by the shielding function of the joint 270 after the needle wing 500 enters the hollow 220, thereby preventing the puncture needle 100 from sliding into the needle cylinder 200 excessively. Based on the condition that the needle wing 500 can realize the block with fretwork 220 through the squeezing action, the needle wing 500 surface can be provided with the elasticity skid resistant course, and this skid resistant course can produce the frictional force that warp and increase and fretwork edge 260 through rough surface in the pressurization process, reinforcing needle wing 500 and fretwork 220's block effect.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides an automatic safe vein blood taking needle of narrowing down and destroying certainly, contains pjncture needle (100), pipe (300), tail needle (400), needle wing (500) and cylinder (200), pjncture needle (100) with tail needle (400) sealing connection make blood can get into pipe (300) and then flow out from tail needle (400) through pjncture needle (100) both ends make, needle wing (500) set up in pjncture needle (100) near-end, characterized in that, cylinder (200) contain cylinder body (210) and fretwork (220), wherein,

a syringe body (210) for receiving the puncture needle (100), the syringe body being provided with openings for allowing the puncture needle (100) to enter and exit from both ends;

and the needle wing (500) clamped into the hollow part (220) realizes the purpose of fixing the puncture needle (100) entering the needle cylinder body (210).

2. A safety intravenous lancet as claimed in claim 1, characterized in that the cutout (220) is connected to the catheter (300) in such a way as to be movable between the puncture needle (100) and the catheter (300) and is located on the side of the needle wing (500) closer to the tail needle (400), the hollow part (220) is provided with an opening which faces the puncture needle (100) and can be clamped with the needle wing (500) in a squeezing way and the like, when the puncture needle (100) slides into the syringe body (210), the needle wing (500) enters the hollow part (220) from the far end of the opening in the same direction as the puncture needle (100) enters the syringe body (210), and the position and the direction of the needle wing (500) are fixed by the hollow part (220) so as to fix the puncture needle (100) entering the syringe body (210).

3. Safety intravenous lancet according to claim 1 or 2, characterized in that said wings (500) realize a first operating condition allowing the puncture needle (100) to enter the cylinder (200) and a second operating condition fixing the puncture needle (100) inside the cylinder (200) in such a way as to be rotatable about a central axis in a second direction, wherein,

when the needle wing (500) is in the first working state, when the puncture needle (100) enters the needle cylinder (200), the needle wing (500) can enter the hollow part (220) in a mode of being parallel to the second direction, and the needle wing can continuously keep a state of being capable of moving freely along the extending direction of the hollow part (220) in a mode of being capable of moving in the same direction as the puncture needle (100);

the needle wing (500) can get into second operating condition from first operating condition through the mode of using the second direction to rotate as the center pin, works as when the needle wing (500) is in second operating condition, the needle wing (500) is partly or all contradicted with the mode that the second direction formed certain contained angle alpha fretwork (220) edge, the needle wing (500) through the block fretwork (220) and with fretwork (220) relative position is fixed make with the pjncture needle (100) that the needle wing (500) is connected get into the rigidity of cylinder (200).

4. A safety lancet according to claim 3, wherein the cylinder (200) is provided with a length larger than the diameter of the distal end of the catheter (300) or the puncture needle (100) in such a manner as to allow the distal end of the catheter (300) or the puncture needle (100) to slide inside thereof, wherein the length of the diameter of the puncture needle (100) is β, the diameter of the cylinder (200) is γ, the distance between the edge of the puncture needle (100) and the cylinder (200) is e, and the cylinder (200) is designed to satisfy the condition of β +2 e < γ.

5. A safety lancet according to claim 4, wherein epsilon is smaller than delta based on the fact that blood slides down due to its own weight when the drop diameter of blood on the outer surface of the lancet (100) reaches delta.

6. A safety intravenous blood collection needle according to claim 5, wherein the inner wall of the needle cylinder (200) near the opening is provided with a collection groove (240) for collecting the liquid flowing along the inner wall of the needle cylinder (200) from the distal end to the opening, and the collection groove (240) is a convex groove with the opening facing the distal end and capable of containing the liquid flowing down from the inner wall of the needle cylinder (200).

7. The safety intravenous blood collection needle according to claim 6, wherein the hollow (220) gradually expands in width from the proximal end to the distal end in a manner of abutting against and pressing the needle wing (500) when the needle wing (500) is allowed to enter, wherein the width of the distal end of the hollow (220) is greater than the thickness of the needle wing (500) to ensure that the needle wing (500) can smoothly enter the hollow (220), and based on the problem that the puncture needle (100) is separated from the needle cylinder (200) when the needle cylinder (200) moves towards the puncture needle (100), the hollow (220) enables the needle wing (500) to move from the distal end to the proximal end edge in a manner of not greater than the extension length of the needle cylinder (200) to abut against the edge of the hollow (220), thereby preventing the puncture needle (100) and the needle cylinder (200) from being separated.

8. The safety intravenous blood collection needle according to claim 7, wherein the opening of the needle cartridge (200) into and out of the puncture needle (100) is provided with a stop catch (250) matching the tip of the puncture needle (100), and the stop catch (250) comprises two parts which are respectively provided outside the opening of the needle cartridge (200) and can be engaged or disengaged in such a manner that the stop catch (250) can be stably maintained without movement inside the needle cartridge (200) when the puncture needle (100) is introduced into the needle cartridge (200).

9. The utility model provides a safe vein blood taking needle, contains passively hides and initiatively hides two kinds of states, a serial communication port, the blood taking needle that initiatively hides realizes the initiative of needle body and hides through setting up portable pjncture needle (100), passively hidden blood taking needle realizes the passive hiding of needle body through setting up syringe (200) that cup joints pjncture needle (100), wherein, syringe (200) can be through cup jointing the blood taking needle or connect through activity piece (230) the blood taking needle makes syringe (200) accomodate pjncture needle (100) under the condition of not separating with the blood taking needle.

10. The safety venous blood collection needle according to claim 9, characterized in that the blood collection needle is provided with a movable piece (230) at one side of a needle wing (500) close to a tail needle, the two ends of the movable piece (230) are connected with the blood collection needle and a needle cylinder (200), the needle cylinder (200) is provided with a hollow (220) allowing the puncture needle (100) to enter and exit, the hollow (220) enables the puncture needle (100) and the catheter (300) to deform into the needle cylinder (200) only through external force through the arrangement of the width smaller than the diameter of the puncture needle (100) and the catheter in a mode of forming a whole or an edge by an elastic deformation material.

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