CN111493894A - Pen type safety blood taking needle - Google Patents

Abstract

A pen-type safety blood taking needle consists of a protective cap, a protective sleeve, a handle, a needle tube, a needle base, a spring, a blood blocking sleeve and a needle holder; the upper section of the needle base is provided with an observation window, the protective sleeve is hidden in the handle, and the handle and the needle holder are mutually embedded and fixed; the outer side of the lower end of the protective sleeve is provided with a convex point, the opposite side of the convex point is provided with a fin extending downwards and outwards, the two sides of the convex point are provided with a pair of locking plates with barb shapes, the locking plates can penetrate through the hole-aligning holes on the wafer of the needle seat to be embedded and fixed with the needle seat, and the spring is compressed in a space formed by the needle seat and the protective sleeve; when in blood collection, the blood collection tube is inserted into the needle holder barrel, so that the blood collection needle punctures the rubber plug of the blood collection tube, and the cap of the blood collection tube can abut against the locking plate to move forward, thereby releasing the locking of the spring; after the blood sampling is finished, the spring is reset to enable the protective sleeve to synchronously move forwards to cover the puncture needle tube and lock to prevent the puncture needle tube from being exposed again when the needle is pulled out. The invention has simple structure, convenience, safety and reliability, and can destroy the needle tube after use, eliminate blood stain splash caused by retraction of the needle tube, eliminate needle stick injury and protect medical care personnel.

Description

Pen type safety blood taking needle

Technical Field

The invention relates to a medical instrument, in particular to a pen type safety blood taking needle with a needle holder, which is matched with a vacuum blood taking tube and used for the collection process of a venous blood sample.

Background

The collection of blood samples generally has three ways: (1) collecting blood subcutaneously: many used for the classification detection of blood cell components, and many used subcutaneous peripheral blood taking needles; (2) blood sampling through veins: the kit is mainly used for detailed detection of hematology, etiology, immunology, genetics and other related disciplines, has wide clinical application, and is mainly used for pen type and split type venous blood taking needles; (3) arterial blood collection is mainly used for detecting arterial blood gas indexes in critical emergency, is less in application and is collected by using an arterial blood collector.

In venous blood collection, a pen type blood collection needle, a split type blood collection needle or an injector is mainly used clinically; the present invention relates only to blood lancets during collection of venous blood.

Pen blood lancet: the structure is a through needle tube, the middle and lower sections of the needle tube are fixed on a needle base, the front end is provided with a sharp cutting edge and is called a vein puncture needle, the rear end is called a blood collection needle, the outer surface is sleeved with a blood blocking sleeve, and two ends of the needle tube are provided with protective sleeves. When the blood collecting needle is used, the blood collecting needle is screwed and fixed at the front end of the needle holder to carry out venipuncture, the vacuum blood collecting tube is inserted into a cavity at the rear end of the needle holder after success, a blade opening at the rear end of the blood collecting needle penetrates through the blood blocking sleeve and penetrates through a rubber plug of the vacuum tube, and blood is pumped into the blood collecting tube under the action of negative pressure; the collection of multitubular secondary blood samples can be realized by repeating the steps; after blood sampling is finished, the vein puncture needle is pulled out to stop bleeding locally; for the abandoned blood taking needle, the sheath of the blood taking needle needs to be sleeved on the outer surface of the blood taking needle again, then the needle body is rotated, and the blood taking needle is taken down from the needle holder and discarded in a sharp instrument box; in the operation process of double-hand complex set, the fingers of the nurse are often easy to be punctured by the needle points for various reasons, the fingers are punctured and injured by the needle, and the infection or the transmission of blood-borne diseases, such as hepatitis C and AIDS, are caused; the consequences are extremely severe.

Split type venous blood taking needle: the structure is formed by connecting a blood collecting needle at the tail end of a hose of an intravenous infusion needle. When the puncture needle is used, the blood collection needle is also required to be rotationally fixed at the front end of the outer cylinder of the needle holder, and the puncture collection process is the same as the puncture collection process; after blood collection is finished, the vein puncture needle is pulled out, local hemostasis is performed, a waste blood collection needle is treated, a nurse needs to pinch the outer surface of a blood collection needle base, then the needle body is rotated, the blood collection needle is taken down from a needle holder, and the blood collection needle and the vein puncture needle are discarded in a waste box; in the process, the blood sampling hose is longer, about 20 cm, so that the blood coagulation chance is increased, the quality of a blood sample is influenced, and the residual blood in the vein puncture needle and the hose can flow everywhere in the process of taking down the blood sampling needle and the hose, so that the environment or the human body is polluted, and the propagation possibility of diseases is caused; in clinical work, fingers of nurses and waste disposal personnel are often punctured by the blood sampling needle tip, and infected bloodborne diseases are caused by puncture injury; the consequences are extremely severe.

Disposable syringe: the medical personnel in basic unit or in the lagging area use the venous transfusion needle to carry out the vein puncture, succeed the back and extract venous blood with syringe conical head and the grafting of venous transfusion needle rear end interface, then shift to in the heparin tube again, (relapse many times, accomplish the collection of multitube sample), this process need open the heparin tube plug and shift to in the heparin tube, in-process that syringe conical head and transfusion needle interface peg graft and shift to in the heparin tube, often can pollute the finger, have certain risk, and complex operation.

The U.S. federal government issued the needle safety and prevention act in 2000: require that medical institutions must provide employees with safe medical equipment; the American occupational safety and health administration sets out the operating standard requirements of workers exposed to blood-borne diseases: in the injection and puncture operation rules, the following steps are firmly avoided: the actions of taking down the needle head, bending the needle head, disconnecting the needle head and sleeving the needle head sheath again by hands.

For economic and historical reasons, the clinical blood sampling operation is also mostly in a mode of using an injector to puncture for collecting blood and using the two blood taking needles to collect venous blood. According to the medical statistics and academic journal reports of China, the incidence rate of needle-prick injuries of clinical care practitioners is up to more than 80%. The hazard is extremely serious.

I have already disclosed the scheme of the safe blood taking needle of pen type, such as: CN 201210294718; CN201120503317 and CN 201010622685; above-mentioned several kinds of technical scheme can be when the blood sampling finishes, through triggering the button, utilize spring force to make the puncture needle file kick-back fast, retract the pjncture needle and get into the urceolus in, effectively avoid the acupuncture injury, eliminate the safety of blood source nature disease infection risk, but still have some not enoughly:

the following disadvantages are found during the production and clinical use: because the trigger button is positioned at one side of the needle holder, the trigger button is triggered in advance due to violent loading and unloading, treading and other behaviors in transportation, so that the product is invalid; namely, the reliability and stability of the product are reduced; the puncture needle and the needle seat are ejected to the inner cavity of the outer cylinder by the compression spring force, the residual blood stain in the puncture needle tube can be splashed by the retraction counterforce, and although the puncture needle is in a small quantity, the puncture needle can also form new pollution and risk to medical care personnel and the surrounding environment.

The technical scheme of negative pressure suction in foreign countries is that when collection is finished, a piston structure with negative pressure retractile is inserted into a needle holder barrel, and the following requirements are simultaneously met in the insertion action of ① releasing a puncture needle seat and the needle holder, ② making an outer barrel of a negative pressure recovery device inseparable with the needle holder, ③ making a piston of the negative pressure recovery device to be embedded with a blood taking needle seat, and ④ making a lock between the piston and a recovery device shell to be released, so under the action of negative pressure, the piston can move towards an inner cavity of the recovery device by the combination of the actions, the puncture needle and the needle seat are sucked into the recovery device barrel by the piston of the negative pressure device, and the action is slow and less splashed due to the action of the negative pressure.

In view of the foregoing, there is a need for an improved pen lancet that overcomes the above-mentioned deficiencies.

Disclosure of Invention

The invention provides a solution for overcoming the defects in the venous blood sampling process. Has the characteristics of safety, reliability, simplicity, convenience, practicability, low price, capability of simplifying clinical operation procedures, improving working efficiency and eliminating acupuncture injuries; in particular to a safety pen type blood taking needle with a needle holder, which is matched with a vacuum blood taking tube for collecting venous blood.

The invention is realized by the following scheme: a pen-type safety blood taking needle consists of a protective cap, a protective sleeve, a handle, a needle tube, a spring, a blood blocking sleeve, a needle base and a needle holder; the method is characterized in that: the needle seat is divided into an upper needle seat and a lower needle seat, and the upper needle seat and the lower needle seat are bonded to form a hollow needle seat with an observation window and a compressible space; the needle tube is divided into a vein puncture needle and a blood collection needle; the center of the upper end of the upper needle base is provided with a hole, a vein puncture needle is bonded in the hole, the lower end of the lower needle base is bonded with a blood collection needle, the outer surface of the blood collection needle is wrapped with a blood blocking sleeve, and the periphery of the upper needle base is sleeved with a spring; the protective sleeve is sleeved on the outer surface of the needle seat, barbs at the lower end of the protective sleeve are inserted into symmetrical holes on the surface of the round piece of the lower needle seat to form embedding, and the spring can be compressed in a space formed by the protective sleeve and the spring supporting platform; the protective sleeve, the needle base and the puncture needle are arranged in a space formed by the handle and the outer cylinder of the needle holder.

The upper end of the upper needle seat is provided with a small hole, and a flat slit-shaped observation window and a compressible space with enlarged aperture are arranged below the small hole; the upper section of the lower needle base is provided with a round hole, the aperture of the round hole is slightly larger than the outer diameter of the upper needle base, and the middle part of the round hole is provided with an expanded round sheet which can be embedded into an annular concave step of the lower edge hole of the handle; the lower section of the lower needle base is provided with a blood collecting needle base, the center of the blood collecting needle base is provided with a blood collecting needle hole, two sides of the blood collecting needle base are provided with symmetrical holes, the holes can be in any shape, and the holes can be mutually embedded with barb locking plates at the lower edge of the protective sleeve; the upper and lower needle seats are spliced together to form a complete needle seat, the inner cavity of the complete needle seat is a compressible space, and the joint part of the upper and lower needle seats is a supporting platform at the lower end of the spring.

The front end of the protective sleeve is provided with a hole, and an inner hole at the joint of the front section and the middle section is expanded backwards to form an inner wall expansion concave step to become an upper end supporting position of the spring; a convex point is arranged on the outer surface of the lower end of the love protective sleeve; the lower edge opposite to the upper edge is provided with an outward bent fin extending downwards; a pair of locking plates with arc barbs extending downwards are arranged at the two sides of the fin and the lower edge of the protective sleeve, and the end parts of the locking plates are also used as triggering plates.

The handle is tubular and is provided with a through hole, the outer part of the front section is provided with symmetrical arc concave surfaces, and the surface of the front section is provided with a plurality of anti-skid convex points; the side wall of the inner hole at the front end is provided with a wedge-shaped bulge which is vertical to the axis of the hole; can be mutually abutted against the warped piece on the protective sleeve to prevent the protective sleeve from retreating; the side wall of the inner hole of the handle is provided with a longitudinal groove which is not communicated with the front end and can interact with the salient point at the outer side of the rear end of the protective sleeve to prevent the protective sleeve from slipping forwards; the outer wall of the rear end of the handle is provided with an annular bulge for being connected with the needle holder in an installing way, and the outer side wall of the lower edge of the handle is provided with two grooves; the edge of the inner hole at the lower end of the handle is provided with an annular concave step.

The needle holder is of a tubular structure, the interior of the needle holder is hollow, an inner hole is formed in the upper end of the needle holder, and an annular groove is formed in the inner wall of the hole; a clapboard is arranged at the joint of the upper section and the middle section, and the clapboard is provided with a middle hole which can pass through the blood collection needle base; the edge of the lower end of the outer cylinder is curled outwards to form a handle.

The operation is carried out by a conventional venous blood sampling method: taking down a front end sheath, performing venipuncture, after success, holding the outer cylinder with the right hand to fix the position of a venipuncture needle, holding a vacuum blood collection tube with the left hand, inserting the rubber plug end of the blood collection tube into a cavity at the tail end of the outer cylinder, pressing the bottom of the vacuum blood collection tube with the thumb, separately holding the outer cylinder edge of a needle holder with four fingers, mutually squeezing the fingers with force, inserting the vacuum blood collection tube into the outer cylinder, enabling a blood collection needle to puncture a blood blocking sleeve and penetrate the rubber plug at the front end of the vacuum blood collection tube, sucking venous blood into the blood collection tube by negative pressure in the blood collection tube, and pulling out the blood collection tube when the negative pressure disappears; the above described actions can be repeated, if desired, to achieve multi-tube venous blood collection. When a blood collection tube is inserted for the first time to puncture a rubber plug of the blood collection tube, the outer protective cover of the blood collection tube plug abuts against the trigger piece of the protective sleeve to enable the protective sleeve to move upwards, the locking piece moves upwards to be separated from the limit of the locking of the lower needle seat, the spring is released, and the spring is still in a compressed state and hidden in the inner cavity of the handle as the spring force is smaller than the force of holding the fixed handle by hand; when blood collection is finished, partial compression hemostasis is performed on one hand, and the protective sleeve hidden by the handle naturally slides forwards under the action of spring force to completely cover the puncture needle tube when the venous blood collection needle is pulled out; because of protecting the slot and spacing arch that the handle front end inner chamber lateral wall was provided with not link up, can with the outstanding bump of protective case lower extreme outside and fin interact of contradicting each other, constitute stopping and anti-disengaging structure, fixed protective case can not the back-and-forth movement, lasting shielding puncture needle tubing. Can prevent repeated use and eliminate the danger of medical staff being hurt by acupuncture.

The integrated structure of the needle holder and the blood taking needle is adopted, so that the integrated structure of the needle holder and the blood taking needle does not need a nurse to connect, screw, install, unscrew and take down the blood taking needle and the outer cylinder of the needle holder in an operation procedure in the using process, operation links are reduced, and the risk of needle stick injury is eliminated.

Because the invention adopts the structure that the protective sleeve and the needle seat are mutually embedded and locked and are hidden in the space formed by the handle and the needle holder, the false triggering phenomenon caused by the brutal behavior is avoided in the links of transportation, assembly and disassembly and the like, and the reliability and the stability of the product are improved; simultaneously, because above-mentioned structure, at the first collection in-process, because the action of inserting of heparin tube, can accomplish the triggering of protective case automatically, reducible operation link, raise the efficiency.

By adopting the structure, after triggering, the protective sleeve can automatically move forwards while the puncture needle is pulled out, and simultaneously covers and wraps the puncture needle tube, so that the puncture needle tube is completely shielded and is not exposed any more. The process is a synchronous process, can eliminate the exposure of the puncture needle and reduce the probability of needle-stick injury and pollution.

By adopting the structure, after the safety protection device is started, the protection sleeve automatically moves forwards, and the puncture needle tube is still, so that the phenomenon of environmental pollution caused by splashing of blood stains in the needle tube due to quick rebound of the puncture needle is eliminated, and the risk of infection of blood-borne diseases can be reduced.

Because the invention adopts the split structure of the puncture needle and the blood collection needle and adopts the transparent composite needle seat structure with the observation window and the compressible space, after the vein puncture succeeds, the vein pressure can act on the compressible space in the needle seat, so that the blood flows to the observation window, and the blood overflow phenomenon can be rapidly observed through the amplification reflection action of the arc surface of the needle seat, and can be used as a mark for judging the success of the vein puncture, thereby improving the working efficiency.

Drawings

FIG. 1 is an exploded view of a pen-type safety lancet according to the present invention;

FIG. 2 is a schematic view showing a structure of a sheath for a pen-type safety lancet according to the present invention;

FIG. 3 is a schematic view of the structure of a lancet handle of a pen-type safety lancet according to the present invention;

FIG. 4 is a schematic view showing the structure of a needle holder of a pen-type safety blood collection needle according to the present invention (upper and lower needle holders and their combination);

FIG. 5 is a structural schematic view of the outer cylinder of the needle holder of the pen-type safety blood taking needle of the present invention;

FIG. 6 is a schematic view showing the overall structure of a pen type safety lancet of the present invention;

FIG. 7 is a structural diagram illustrating a state of a trigger test in a collection process of a pen-type safety lancet according to the present invention;

FIG. 8 is a schematic structural diagram of the pen-type safety blood taking needle of the present invention, after the specimen collection is completed and the protection device is started, the protection sleeve moves forward, covers the puncture needle, and is limited to be unable to fall off and retract.

Detailed Description

As shown in figure 1, the pen-type safety blood taking needle comprises a protective cap 1, a protective sleeve 2, a handle 3, a puncture needle tube 41, a blood collecting needle 42, a spring 5, a blood blocking sleeve 6, an upper needle seat 71, a lower needle seat 72 and a needle holder 8, wherein a sharp cutting edge is arranged at the front end of the vein puncture needle 41, a cutting edge is also arranged at the rear end of the blood collecting needle 42, the blood blocking sleeve 6 is a hollow blind tube and is made of elastic sealing materials (rubber or silica gel and elastic plastic), the spring 5 is made of stainless steel wires, the length of the spring is L, the outer diameter of the spring is W, the inner diameter of the spring is N, the length L of the spring 5 is larger than the sum of the lengths of the puncture needle and the upper needle seat, the outer diameter W of the spring 5 is smaller than the inner diameter of a tube cavity of the lower two thirds of the protective sleeve.

As shown in fig. 2 (fig. 2- ① is a three-dimensional view of the protective sleeve, fig. 2- ② is a longitudinal front sectional view, fig. 3- ③ is a longitudinal left sectional view), the protective sleeve 2 is a hollow tube, the upper end of the hollow tube has a hole 21, the hole diameter is slightly larger than the outer diameter of the upper needle base 71, the outer side of the lower end of the protective sleeve is provided with a convex point 23, the outer walls of the two sides of the convex point are provided with two symmetrical downward extending and barbed locking plates 24, the side wall opposite to the convex point is provided with an outward bent fin 25, the inner hole diameter of the upper third part of the protective sleeve expands outwards and downwards, an annular concave platform 22 is formed at the position, and the upper end supporting position.

The handle shown in fig. 3 (fig. 3- ① is a three-dimensional view of the handle, fig. 3- ② is a longitudinal sectional view, fig. 3- ③ is a bottom view) is a tubular structure, the upper end of the tubular structure is provided with a hole 31, the diameter of the hole is slightly larger than the outer diameter of the protective sleeve, the outer side of the middle section of the handle is provided with a symmetrical concave cambered surface 32, a plurality of anti-skid convex points are arranged on the cambered surface, the inner wall of the hole 31 is provided with a longitudinal groove 35, the upper edge of the inner wall of the front end is not penetrated, the inner wall of the front end opposite to the groove 35 is provided with a wedge-shaped bulge 36 which is vertical to the axis, the outer side wall of the middle section.

Fig. 4 is a schematic structural diagram of a needle holder, which is shown in fig. 4- ③ and fig. 4- ④, the needle holder is divided into an upper needle holder and a lower needle holder, 71 is the upper needle holder, the upper section of the upper needle holder is provided with a small hole 711 into which a puncture needle can be inserted, the lower part of the upper needle holder is provided with a narrow observation window 712 (shown in fig. 4- ⑤) which is a flat gap, an extension tube 713 with an enlarged inner diameter is arranged below the observation window, the lower needle holder 72 is in a circular sheet shape, a concentric dimpled hole-shaped connector 721 is arranged above the circular sheet and can be mutually inserted and bonded with the extension part of the upper needle holder, a concentric blood collection needle holder 724 is arranged below the circular sheet, an expanded ball 723 can be embedded and fixed with a blood blocking sleeve 6, a through hole 722 is arranged in the center of the blood collection needle holder and is bonded with a blood collection needle tube 42 in the hole, and a pair.

Referring to fig. 4- ① and 4- ②, the upper needle seat and the lower needle seat are bonded with each other to form the blood collecting needle seat 7.

The needle holder shown in fig. 5 (fig. 5- ① is a three-dimensional view of the needle holder, fig. 5- ② is a longitudinal sectional view, fig. 5- ③ is a bottom view) is a tubular structure, the lower end edge of the needle holder is provided with a curled edge to form a handle 85, the inner wall of the upper end hole 81 is provided with an annular bulge 82 which can be tightly embedded with the annular groove 34 of the lower end outer side wall of the handle 3, and the upper third of the needle holder is provided with a horizontal partition 83, the inner wall of which is provided with a hole 84 which can pass through the blood collection needle seat 724 of the lower needle seat 72 and the locking piece 24 of.

FIG. 6 is a schematic view of the overall structure of the present invention, wherein the upper and lower needle bases are bonded to each other to form a needle base 7, a puncture needle tube 41 is bonded in the upper end hole, a blood collection needle tube 42 is bonded in the lower end hole, and a blood blocking sleeve 6 is wrapped on the outer surface of the blood collection needle; the needle seat 7 is arranged in an annular concave step 37 at the lower end of the handle 3, the protective sleeve 2 is positioned in the inner cavity of the handle 3 and sleeved outside the needle seat, and the spring 5 is compressed in a space formed by the needle seat 7 and the protective sleeve 2; the handle 3 is inserted into a hole 81 at the upper section of the outer cylinder of the needle holder 8 and is tightly embedded; the protective cap 1 is sleeved on the outer surface of the puncture needle 41 and forms a tight fit with the handle 3.

FIG. 7 is a schematic view showing the use of a pen-type safety blood collection needle of the present invention, wherein when in use, the package is opened, the protective cap 1 is removed, the vein-pressing band is bundled, the vein puncture is performed after the skin of the portion to be punctured is partially sterilized, and after the success (blood overflow phenomenon at the observation window), the puncture needle is fixed by one hand, the negative pressure blood collection tube G is taken by the other hand, the forefinger and the middle finger hold the needle holder to curl up, the thumb and the bottom of the blood collection tube are pressed against each other, so that the rubber plug S at the front end of the blood collection tube is punctured by the blood collection needle 42, meanwhile, the protective end cap D at the front end of the blood collection tube abuts against the locking plate 24 to move it upward, and is separated from the embedment of the hole 725 of the lower needle holder, the spring 5 in a locked and compressed state is released, so that the protective sleeve 2 moves forward, and the protective sleeve is, Because the puncture needle is still in the human tissue at the moment), the protective sleeve 2 is still hidden in the inner cavity of the handle 3 although slightly moved forwards (triggering displacement); the negative pressure in the blood collection tube can suck venous blood into the vacuum blood collection tube, and the blood collection tube is pulled out when the negative pressure disappears, namely the collected blood volume reaches the preset requirement; if necessary, the actions can be repeated to realize multi-tube venous blood collection.

FIG. 8 is a schematic view of the structure of the protective sleeve advancing to bend the puncture needle to cover and cover the shielding after the specimen is collected and the protective device is started; when blood collection is finished, the hemostatic plaster is held by one hand to press the needle inlet point, and the vein puncture needle is pulled out by the other hand, and simultaneously the protective sleeve is moved forwards by the spring force to cover the puncture needle tube; due to the interaction of the convex points 23 at the outer side of the rear end of the protective sleeve and the grooves 35 on the inner wall of the handle, the protective sleeve 2 can be prevented from falling off forwards; the protection sleeve 2 can be prevented from retreating due to the interaction of the fin 25 at the rear end of the protection sleeve and the wedge-shaped bulge 36 on the inner wall of the front end of the handle; thereby leading the protective sleeve 2 to be embedded and fixed at the front section of the handle 3 and covering the puncture needle tube so as not to be exposed again.

The whole structure of the pen type safety blood taking needle is formed by the above structures.

Because the upper needle seat and the lower needle seat form a compressible space, the volume of the space is far more than dozens of times of the space relative to the inner cavity of the puncture needle tube, so that venous blood can overflow to penetrate through the vein puncture needle tube and enter the observation window of the needle seat to be observed under the venous pressure, and the success of vein puncture can be judged.

Due to the adoption of the structure that the protective sleeve moves forwards, when the puncture needle is pulled out after collection, the protective sleeve synchronously covers the puncture needle tube under the action of spring force, so that the needle point is effectively prevented from being exposed in time, pollution is avoided, and the puncture injury is eliminated. Because the puncture needle has no quick retraction action, the phenomenon of bloodstain splashing in the needle tube can be eliminated, and the risk of secondary pollution is eliminated.

Because the locking and embedding of the locking piece of the protective sleeve and the circular sheet hole of the needle seat and the abutting triggering mode in the blood sampling tube are adopted, the product failure phenomenon caused by the possible false triggering or early triggering of products with other structural forms (such as a side wall key and a triggering key structural mode) during the transportation process and the rough loading and unloading process is eliminated; so that reliability and stability are improved.

The invention has the characteristics of safety, reliability, convenience and practicability.

Claims (5)

1. A pen-type safety blood taking needle consists of a protective cap (1), a protective sleeve (2), a handle (3), a needle tube (4), a spring (5), a blood blocking sleeve (6), a needle base (7) and a needle holder (8); the method is characterized in that: the needle seat (7) is divided into an upper needle seat (71) and a lower needle seat (72), and the upper needle seat and the lower needle seat are bonded to form a hollow needle seat (7) with an observation window (712) and a compressible space (713); the needle tube (4) is divided into a vein puncture needle (41) and a blood collection needle (42); the center of the upper end of the upper needle base (71) is provided with a hole (711) in which a vein puncture needle (41) is bonded, the lower end hole of the lower needle base (72) is bonded with a blood collection needle (42), the outer surface of the blood collection needle is wrapped with a blood blocking sleeve (6), and the periphery of the upper needle base (71) is sleeved with a spring (5); the protective sleeve (3) is sleeved on the outer surface of the needle seat (4), barbs (24) at the lower end of the protective sleeve are inserted into symmetrical holes (725) on the surface of the lower needle seat wafer (726) to form embedding, and a spring (5) can be compressed in a space formed by the protective sleeve (2) and a spring supporting platform; the protective sleeve (2), the needle seat (7), the spring (5) and the needle tube (4) are arranged in a space formed by the handle (3) and the needle holder (8).

2. A safety lancet of the pen type according to claim 1, wherein: a small hole (711) is arranged at the upper end of the upper needle seat (71), an observation window (712) which is a flat gap and a compressible space (713) with an enlarged hole diameter are arranged below the small hole; the upper section of the lower needle seat (72) is provided with a round hole (721), the middle part of the lower needle seat is provided with an expanded circular sheet (726), and the circular sheet (726) can be embedded into an inward concave step (37) of an annular hole at the lower edge of the handle (3); the lower section of the lower needle seat (72) is provided with a blood collection needle seat (724), the center of the blood collection needle seat is provided with a blood collection needle hole (722), two sides of the blood collection needle seat (724) are provided with symmetrical holes (725) which can be in any shape, and the holes can be mutually embedded with barb locking plates (24) at the lower edge of the protective sleeve; the upper needle seat and the lower needle seat are spliced and adhered to form a complete needle seat (7), an inner cavity formed by combining inner holes of the upper needle seat and the lower needle seat is a compressible space (713), and a joint part of the upper needle seat and the lower needle seat is a supporting platform (727) at the lower end of the spring.

3. A safety lancet of the pen type according to claim 1, wherein: the upper end of the protective sleeve (2) is provided with a hole (21), and the inner hole at the upper third part is backwards expanded to form a concave step (22) with an expanded inner diameter to become an upper end supporting position of the spring (5); a salient point (23) is arranged on the outer side of the lower end of the protective sleeve (2); the lower edge opposite to the upper edge is provided with a downward extending and outward bending fin (25); a pair of locking plates (24) with arc barbs extending downwards are arranged on the two side walls of the fin and positioned on the lower edge of the protective sleeve, and the end parts of the locking plates are also used as trigger plates.

4. A safety lancet of the pen type according to claim 1, wherein: the handle (3) is a tubular through hole (31), the outer part of the upper section of the handle is provided with symmetrical arc concave surfaces (32), and the surface of the handle is provided with a plurality of anti-skid convex points; the side wall of the inner hole at the upper front end is provided with a wedge-shaped bulge (36) vertical to the axis of the hole; can be mutually abutted against a fin (25) at the lower end of the protective sleeve to prevent the protective sleeve from retreating; the inner wall of the handle hole is provided with a longitudinal groove (35) which is not communicated with the upper end and can interact with a convex point (23) at the outer side of the lower end of the protective sleeve (2) to prevent the protective sleeve from sliding forwards; the outer peripheral wall of the lower section of the handle is provided with an annular bulge (33), and the outer peripheral wall below the annular bulge is provided with an annular groove (34); the edge of the inner hole at the lower end of the handle is provided with an annular concave step (37).

5. A safety lancet of the pen type according to claim 1, wherein: the needle holder (8) is of a tubular structure, the inside of the needle holder is hollow, the aperture of the lower section of the needle holder is slightly larger than the outer diameter of the blood collecting tube, and the inner wall of the hole of the inner hole (81) at the upper end of the needle holder is provided with an annular bulge (82) which can be tightly embedded with the outer diameter of the lower section (3) of the handle and an annular groove (34) thereof; a partition plate (83) is arranged in a hole at the joint of the upper section and the middle section, and a middle hole (84) is arranged on the partition plate and can penetrate through the blood collection needle seat; the lower end edge of the outer cylinder (8) is curled outwards to form a handle (85).

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