WO2013023435A1

WO2013023435A1 - Secure vein puncture needle

Info

Publication number: WO2013023435A1
Application number: PCT/CN2012/001072
Authority: WO
Inventors: 张亚平
Original assignee: Zhang Yaping
Priority date: 2011-08-12
Filing date: 2012-08-13
Publication date: 2013-02-21
Also published as: CN102284104A; CN102284104B

Abstract

A secure vein puncture needle comprises a jacket (0), a needle pipe (1), a needle base (2), a flexible pipe (3), a spring (4), a shielding casing pipe (5), and a dividing cut-off clamp (6). The needle pipe (1) is adhered into a front end hole (2b) of the needle base (2). A convex ridge (2a) at a side wall of the needle base (2) is inserted into a longitude trench (5c) of a front segment of an inner cavity of the shielding casing pipe (5), so as to keep directions of a puncture needle tip (1a) and a handle (5b) consistent. The shielding casing pipe (5) sleeves the needle pipe (1), the needle base (2) and the flexible pipe (3). The spring (4) is compressed into a space between the shielding casing pipe (5) and a front end of the needle base (2). An end of the shielding casing pipe (5) is adhered to the flexible pipe (3) in a high-frequency heat sealing manner. The dividing cut-off clamp (6) sleeves the end of the shielding casing pipe (5). The cut-off clamp (6) is inserted into an open window (5d) of the shielding casing pipe (5). A lower segment of a pipe wall of the shielding casing pipe (5) is thickened to form a narrowed pipe cavity (5f), thereby limiting the convex ridge at the side wall. In use, the dividing cut-off clamp (6) is pressed to divide a thin side tape (5e) of the shielding casing pipe (5), so that the casing pipe (5) moves forwards under the action of the spring (4) to completely cover the puncture needle, and meanwhile, the flexible pipe (3) is closed by the cut-off clamp (6), thereby eliminating the risk of needle-stick injury and avoiding the overflow of blood, drug liquids, and body fluids in the flexible pipe (3).

Description

Safety venipuncture needle

Technical field

The invention relates to a medical device, in particular to a method for collecting specimens in a venous blood vessel (which may also be a chamber for tissue), injecting a drug solution into a venous blood vessel, venous blood sampling and intravenous blood transfusion. Type puncture needle.

Background technique

When people are fighting diseases, they usually need to puncture the venous blood vessels to collect and analyze the venous blood vessels to obtain the physiological or pathological state of the human body. It is also often used to inject venous blood vessels into the venous blood vessels to reach the veins. Whole body, exertion, compensation, replacement and treatment; In the above test and treatment process, a venous penetrating needle is needed to achieve an invasive intervention on the human venous blood vessels, thereby establishing a temporary passage from the outside to the blood vessel.

In this process, the venous penetrating needle has the dual role of (into the venous blood vessel or tissue chamber) in the targeted intervention and the establishment of a temporary channel, which requires sophisticated techniques and risks, and must be carried out under the control of a professional technician.

At present, various intravenous venous needles (infusion needles, blood transfusion needles, blood collection needles, biopsy needles, indwelling needles, etc.) can meet the above requirements, but there are also serious deficiencies and defects: venipuncture After the needle is used in the above environment, the needle tip is exposed. Touching the tip of a patient's blood often causes acupuncture damage to health care workers and waste disposal personnel, causing infection and spread of blood-borne diseases. In addition, in the clinical, common infusion sets and infusion needles, after the venous puncture needle is pulled out, the needle tip is not only exposed, but also the liquid medicine, blood, body fluid, etc. remaining in the infusion tube are still leaking. Falling into the environment also causes pollution or infection to the environment and other people, causing the spread of blood-borne diseases or other diseases.

In the venipuncture apparatus, engineers and technicians have done a lot of work, and designed and developed various forms of safe intravenous infusion needles. Most of them use mechanical (spring) force or manual method to pull the infusion needle body (including the needle tip) back. The technical solution of shrinking into the protective sleeve; only the protection and shielding of the needle tip can be achieved, and the occurrence of needle stick injury can be prevented, but the infusion (blood) pipeline can not be effectively cut off, and the blood (body, medicine) liquid is prevented. Spill and runny, reduce pollution and infection to the environment and the human body.

At present, there is no technical solution that can meet the requirements of the above-mentioned environment for venipuncture needles, that is, to meet the requirements of preventing needle stick injuries, and at the same time to prevent the residual liquid or body fluid overflow in the pipeline.

In the clinically common venipuncture needles, there are several uses:

1. Pen type blood collection needle: The structure is a penetrating needle, and both ends have a sharp cutting edge; the middle and lower part of the needle tube is fixed on the needle seat, the front end is called a venipuncture needle, the back end is called a blood collection needle, and the blood collection is collected. The blood on the surface of the needle is There are protective sleeves at both ends of the needle tube. When in use, the blood collection needle is rotated and fixed at the front end of the outer tube of the needle holder, and the venipuncture is performed. After successful, the vacuum blood collection tube is inserted into the cavity of the rear end of the needle holder, so that the back end of the blood collection needle passes through the blood blocking sleeve and runs through. Puncture the vacuum tube rubber plug, and draw the blood into the blood collection tube under the action of negative pressure; thus, it can realize the collection of multiple blood samples; after the blood collection is completed, the venous needle is pulled out, local hemostasis, and the discarded blood collection needle, The nurse needs to re-seal the front end of the blood collection needle on the outer surface of the blood collection needle, then rotate the needle body, remove the blood collection needle from the needle holder, and then discard the blood collection needle in the waste box; Process, for a variety of reasons, the nurse's fingers are often easily stabbed by the needle tip, acupuncture injury, causing infection or spread of blood-borne diseases, such as hepatitis C, AIDS; the consequences are extremely serious.

2. Venous blood collection needle: The structure is formed by connecting a blood collection needle to the needle end of the hose of the intravenous infusion needle. When it is used, it also needs to rotate the blood collection needle to the front end of the needle holder, and the hand vein puncturing is performed for the vein. After successful, the vacuum blood collection tube is inserted into the cavity of the rear end of the needle holder to make the blood collection needle blade. The mouth passes through the blood-sealing sleeve and penetrates into the vacuum tube rubber plug, and under the action of negative pressure, the blood is inhaled into the blood collection tube. When necessary, it can be repeated to achieve multi-tube blood collection; after blood collection is completed, the venous puncture needle is pulled out, local hemostasis is performed, and the discarded blood collection needle is disposed. The nurse needs to pinch the outer surface of the blood collection needle hub, and then rotate the needle body to set the blood collection needle. Remove from the needle holder and discard it in the waste box together with the venipuncture needle; in the above process, because the blood collection hose is long, about 20 cm, the residual blood in the venipuncture needle and the hose, in the blood collection needle and soft During the process of tube removal, blood will flow everywhere, pollute the environment or the human body, causing the spread of the disease. Currently, in clinical work, the fingers of nurses and waste disposal personnel are also very easily injured by the tip of the blood collection needle, due to acupuncture Injury causes infection with blood-borne diseases; the consequences are extremely serious.

According to the statistics of the US National Health Service: needlestick injuries in the injection puncture and blood collection process accounted for 26% of the incidence of acupuncture injuries; the US federal government enacted the Acupuncture Safety and Prevention Act in 2000: requiring medical institutions to be employees Providing safe medical equipment; The operating standards of workers exposed to blood-borne diseases formulated by the US Occupational Safety and Health Administration, which require: In the injection and puncture procedures, resolutely eliminate: hand removal of the needle, bending of the needle, disconnection of the needle, The behavior of a double needle sheath.

3, intravenous infusion needle: the current clinical use of intravenous infusion needle, simple structure, basically does not have a safety protection device (typical structure see Figure 1), consists of needle tip sheath, needle seat, intravenous needle, hose; The main equipment for medical staff to be injured by acupuncture. According to medical statistics, the incidence of acupuncture injury in clinical nursing practitioners is as high as 80% or more, and the harm is extremely serious.

In summary, there is an urgent need in the clinic for a method of shielding the puncture needle and effectively avoiding needle stick injury during the process of infusion of drug solution, blood transfusion, blood collection, and body fluid collection; at the same time, the pipe above the end of the puncture needle can be automatically cut off. A safe and reliable venipuncture needle device that prevents leakage of blood, body fluids, and drug residues in the above environment, and eliminates the risk of infection from blood-borne diseases. At present, there is nothing that can be such simple, Economic, practical and safe technical solutions are made public.

Summary of the invention

The invention provides a safe venous puncture needle for the solution of the venipuncture needle in the venous and tissue chambers for puncture, infusion, blood transfusion and collection of specimens.

The invention is realized by the following scheme: a safety type venous puncture needle, which is composed of a sheath, a puncture needle tube, a needle seat, a hose, a spring, a shielding sleeve and a cut-off clip; wherein: the needle tube is stuck and fixed In the central hole at the front end of the needle holder, the diameter of the rear part of the needle seat is reduced and fixed to the hose; the shielding sleeve is sleeved on the outer surface of the spring, the needle tube, the needle seat and the hose, and the spring is compressed in the front part of the shielding sleeve In the space formed with the front end of the needle seat; the end of the shielding sleeve and the hose are bonded to each other by high frequency heat sealing or other means to maintain the compression of the spring; the breaking cutoff clamp is set at the end of the shielding sleeve, and the cutting clamp is cut off. The upper and lower disconnecting shear plates are inserted into the upper and lower windows of the end of the shielding sleeve.

A pair of longitudinal semi-circular protrusions are arranged on both sides of the front part of the needle seat, and the lower part of the needle seat is tapered to be fixed with the hose, and the plane of the tip edge is parallel to the line connecting the two longitudinal protrusions.

The shielding sleeve is a hollow structure, the front end opening is reduced, and the diameter thereof is equal to or slightly larger than the outer diameter of the needle tube; the inner diameter do of the front portion of the shielding sleeve is equal to or slightly larger than the outer diameter of the spring; the outer side of the middle portion of the shielding sleeve has at least one lateral direction a flat structure of the protrusion forming an operating handle; a diameter D of the inner cavity of the shield sleeve is equal to or slightly larger than a cylinder diameter Z of the front section of the needle seat _{; a} circular side wall of the middle front section of the shield sleeve has a pair of semicircular longitudinal directions The groove, the maximum spacing D1 is equal to or slightly larger than the distance Z1 of the two longitudinal protrusions of the outer side wall of the front section of the needle seat, and the line connecting the two longitudinal grooves is parallel to the plane of the flat handle; The cavity diameter D2 is equal to or slightly larger than the distance Z1 between the two longitudinal protrusions on the side of the needle seat. At the end of the shielding sleeve, the pipe wall has two horizontally open windows corresponding to each other with a length of about 3, and the sides of the window are thin. The thin tube wall forms a side band; the inner wall of the sleeve in front of the window is thickened such that the inner diameter of the sleeve is smaller than the distance Z1 between the two longitudinal protrusions of the front portion of the needle seat.

A breaking cut-off clip is made of a hard material or a metal material, and the upper and lower plates are connected in a U-shaped structure, and the bottom of the valley has a circular hole through which the hose passes, so that it is placed at the end of the shielding sleeve, The front end of the upper plate of the cut-off clip has a pair of inserts with a check-toothed buckle, which can be inserted into the wedge-shaped holes at the front end of the lower plate to form a self-locking check structure; a pair of curved pads are correspondingly arranged in the middle of the front end of the upper and lower plates. Forming a cut-off clamp to the hose; on the outside of the cut-off clip, the front ends of the upper and lower plates each have a pair of intersecting shear plates that are in contact with each other but are in close contact with each other, similar to the two half plates of the cutting machine or the scissors. In the clinic, at the end of the above diagnosis and treatment process, the medical staff uses the fingers to force the cut-off clips to break the shear plate and the upper and lower interactions. At the mutual contact seams, the micro side remaining at the window of the shield sleeve can be left. With rapid shear disconnection; at the same time, the cut-off clamp is closed up and down, the inner cavity of the hose is closed, and the liquid in the hose is cut off. Because of the action of the non-returning buckle and the wedge-shaped hole between the upper and lower plates, the above action effect is maintained. . After the disconnection of the shielding sleeve, the adhesion to the hose is lost, and the spring force is made. Use the lower part to move forward quickly and cover the piercing needle tip until the narrowed end of the shielding sleeve interacts with the outer axon of the needle hub to stop. The shield sleeve is completely covered by the needle tip without excessive advancement.

Another type of breaking cut-off clip is composed of a button 7, a cylinder 8 and a base 9;

Referring to Figures 8-13, the button 7 is a T-shaped cylinder having a flat end at its upper end and a plurality of semi-circular protrusions on its circumferential edge for rotational grip; an indicator arrow 7A on the surface; In the upper section, there is an annular tooth 7B, the inner diameter of the largest diameter cylinder 8 of the tooth tip; above the annular tooth 7B, the two axially symmetrical two cutting teeth 7C; the inner diameter of the largest diameter cylindrical body 8 of the tooth tip; all the teeth The lower tooth surface of the tooth is inclined upward and the upper tooth surface is flat; in the lower portion of the button 7, there is a circular plane 7D, the inner diameter of the outer diameter cylinder 8 of the plane; the plane is 90° opposite to the cutting tooth 7C, The two sides of the axial direction are symmetrically cut, and the width of the plane 7D after cutting is the minimum spacing of the upper limit teeth 8B of the upper end of the cylindrical body 8; under the above-mentioned cut plane 7D of the button 7, there is a rectangular pressing plate 7E, the middle of the pressing plate The bottom surface has an arcuate groove 7F, the width of the groove 7F is the outer diameter of the infusion hose; the width of the platen 7E on the curved groove surface W protects the outer diameter of the sleeve; the end of the pressure plate 7E to the curved groove side 7F Width M Wall thickness of the sleeve to shield (greater than the width of the shielding sleeve with side).

The cylinder 8 is a circular tube structure, the upper half of which has a symmetrical over-centered slit 8A, and the upper edge inner wall perpendicular to the slit 8A, has two symmetrical limiting teeth 8B, the upper teeth of the teeth face down Tilt, lower tooth surface level; distance between the two limiting teeth 8B of the ring tooth 7B of the button 7 and the root diameter of the cutting tooth 7C; the distance between the two limiting teeth 8B and the plane 7D of the lower portion of the button 7 are cut The width W; the wall of the tube in the direction corresponding to the limiting tooth 8B in the lower portion of the cylinder 8 has a symmetrical through-groove 8C through the center line, the upper portion of the groove is semi-circular, and the diameter thereof is slightly smaller than the outer diameter of the protective sleeve a diameter, at the lower end of the side wall of the slot 8C, there is a symmetrical horizontal groove 8D;

The base 9 is a disc structure having a plurality of semicircular protrusions on its periphery. The surface of the cylinder has a cylindrical protrusion, and in the middle of the protrusion of the cylindrical table, there is a horizontal groove 9A of the axis, the diameter of which is smaller than the diameter of the infusion hose (3); and a depression in the middle of the cylindrical table on both sides of the groove 9A 9B, the cylindrical table is U-shaped in the longitudinal direction of the groove; the width of the recess 9B is greater than or equal to the thickness of the lower end plate 7E of the button 7; and the lower end of the cylindrical table groove 9A of the base 9 is outwardly extended. The protrusion 9C of the table also has a groove 9E having a diameter greater than or equal to the outer diameter of the protective sleeve; the distance between the two side walls of the protrusion 9C is equal to the width of the lower groove 8C of the barrel 8; and the side wall at the lower end of the protrusion 9C Each has a lateral projection 9D which is matched with the lateral groove 8D at the lower end of the groove 8C of the lower portion of the cylindrical body 8, so that mutual fitting can be formed.

When using, the operation is performed by conventional venipuncture method: the front end sheath is removed, and the venous puncture is performed. After successful, intravenous infusion liquid medicine, venous blood sampling, blood transfusion, body fluid collection and treatment are performed.

At the end of the above treatment or diagnosis, the breaking cutoff clip of the present invention is pressed hard to make the cutoff cutoff The clip cuts off the connecting side belt at the window opening of the shielding sleeve, and at the same time, the hose is pressed and cut off, and the toothed rod and the wedge hole act to maintain the above action, and the hose can be closed and closed, because the shielding sleeve The tube is disconnected and pulled away from the hose, and the spring force is moved forward to shield the puncture needle. It can eliminate the need of acupuncture injury, prevent blood, body fluids or liquid medicine from overflowing, reduce or eliminate the spread of blood-borne diseases, and eliminate the risk of needle-smashing of medical personnel.

Since the present invention adopts a structure in which a shield sleeve, a built-in spring, and a tail end of the venipuncture needle are installed, the present invention has the following features:

1. The shielding sleeve is a flexible transparent tube, which is integrated with the handle and externally placed on the outside of the hose. It does not affect the local fixation of the venipuncture needle, and does not increase the patient's discomfort. Currently, various safety venous needles at home and abroad The hard protective sleeve is used. After the venous pen is inserted into the local blood vessel, the protective sleeve is upturned at the tail of the needle handle, forming a certain angle with the surface tissue and difficult to fix, which will seriously affect the venous needle. Its movement will involve the position of the venipuncture needle in the venous blood vessel, which often causes the vascular endothelium to penetrate. Therefore, the technical scheme of using the hard protective sleeve at home and abroad has not been applied to the field of intravenous infusion needle, and can only be used for a process of briefly puncturing a venous blood vessel, such as a venous blood collection needle;

2. The flexible transparent shielding sleeve used in the invention compresses the spring between the needle seat and the sleeve, and bonds the shielding sleeve to the liquid hose by high frequency heat sealing (or other bonding method), and The external off-cut clamp is an inspiration, restriction, and self-locking device for safety features. The invention has the function of moving the liquid medicine, body fluid or blood in the cut-off hose, and the shield sleeve can be moved forward to completely cover the venipuncture needle. It can realize the protection of the venipuncture needle and the cut-off of the liquid in the hose in one step, and eliminate the occurrence of needle stick injury, avoid the pollution of blood, liquid medicine and body fluid to the medical staff and the environment, and reduce the spread of the disease;

3. Since the invention adopts a cutting-off cutting clip outside the end of the hose and the shielding sleeve, the unique cutting-back buckle and the wedge-shaped hole structure of the cutting-off clip form a symmetrical automatic locking structure, so that the vein is After the puncture (infusion, blood transfusion, blood collection, treatment), just use the thumb index finger to press the cut-off clip with one hand, and then quickly cut off the connection between the side of the shield sleeve and the hose, and unshield the sleeve. The compression limit of the spring releases the spring. Under the action of the elastic force, the shielding sleeve moves forward to shield the needle tip. At the same time, the cutting clamp squeezes the hose to close and close. The above actions are completed once, which can reduce the labor of the nurse and improve the work. effectiveness. DRAWINGS

Figure 1 is a schematic view showing the overall structure of a common common venipuncture needle;

Figure 2 is a schematic exploded view of a safe venipuncture needle of the present invention;

3 is a schematic structural view of a needle holder of a safe venipuncture needle according to the present invention;

4 is a schematic structural view of a shield sleeve of a safe venipuncture needle according to the present invention;

Figure 5 is a cross-sectional view showing the structure of the breaking cut-off clip of the first embodiment of the present invention; 6 is a schematic view showing the overall assembly structure of the first embodiment of the safe venous penetrating needle of the present invention; FIG. 7 is a schematic view showing the overall structure of the first embodiment of the safe venipuncture needle of the present invention after the safety device is activated after use;

Figure 8 is an exploded perspective view showing the entire structure of the disconnecting clip of the second embodiment of the present invention;

9 is a schematic view showing the structure of a button of a disconnecting clip according to a second embodiment of the present invention;

Figure 10 is a schematic view showing the overall state of the infusion soft tube and the outer surface of the protective cannula of the venipuncture needle of the present invention according to the second embodiment of the present invention;

Figure 11 is a cross-sectional view of the cutting-off clip of the second embodiment of the present invention along the long axis of the infusion hose before the execution cut-off;

Figure 12 is a longitudinal sectional view of the cutting-off clip of the second embodiment of the present invention along the long axis of the infusion hose before the execution of the cut-off;

Figure 13 is a longitudinal section of the infusion hose of the second embodiment of the present invention after the cut-off operation, after the side cable portion of the protective sleeve is squeezed and disconnected, and the infusion hose is pressed by the button; Cutaway view.

detailed description

The invention provides a safety venipuncture needle, which comprises a sheath, a needle tube, a needle seat, a hose, a spring, a shielding sleeve and a breaking cut-off clip; a needle tube is glued in the front end hole of the needle seat, and the needle seat has a side wall thereof The axon is inserted into the longitudinal groove in the inner cavity of the shield sleeve to keep the edge of the needle tip aligned with the handle; the shield sleeve is sleeved on the outer surface of the needle tube, the needle seat and the hose, and the spring is compressed in the shield sleeve In the space with the front end of the needle holder, the end of the shielding sleeve is heat-sealed and adhered to the hose. The breaking cut-off clamp is placed at the end of the shielding sleeve, and the cut-off clip is inserted into the window of the shielding sleeve to shield the lower wall of the sleeve. Thickening forms a narrowed lumen, which limits the formation of sidewall protrusions. In use, the pinch-off clamp can be used to break the thin side band of the shielding sleeve, so that the sleeve moves forward under the force of the spring, completely covering the puncture needle, and the hose is closed by the cut-off clamp, eliminating the needling The risk of injury, avoiding the overflow of blood, liquid and body fluids in the hose.

The following is a detailed description in conjunction with the drawings:

Figure 1 is a conventional intravenous infusion needle. The venous needle A1 is fixed to the needle holder and connected to the socket A4 by means of the other end of the hose A3. When used (venous blood collection, infusion, blood transfusion, body fluid extraction, etc.) Because the connecting hose of the puncture needle is long (about 20 cm), the venous puncture needle at the front end of the operating handle A2 and the residual blood (transfusion or blood collection process), liquid medicine or body fluid (surgical treatment process) in the hose cannot be discharged. At the end of the above process, blood, liquid medicine and body fluids will flow everywhere, pollute the environment or the human body; due to the exposure of the venous needle tip, the fingers of nurses and waste disposal personnel are very easily stabbed by the needle tip due to various reasons. Risk of acupuncture injury; the consequences are extremely serious. 2 is a schematic exploded view of the entire structure of a safe venipuncture needle according to the present invention. As can be seen from the figure, a safe venipuncture needle of the present invention comprises the following parts: a sheath ₀ , a needle hub ₂ , a hose ₃ , The spring 4, the shielding sleeve 5, and the breaking cut-off clamp 6. The sheath 0 is a transparent blind tube which can be inserted into the front end of the shielding sleeve 5; the front end of the needle tube 1 has a sharp edge la, forming a venous penetrating needle; the needle seat 2 has a tubular structure, and the front part has a pair of longitudinal shapes. The abbreviated shaft 2a has a hole 2b at the front end, the diameter of which is matched with the diameter of the needle tube 1 and the needle tube 1 is fixed in the hole; the hose 3 is a colorless and transparent flexible pipe for conveying the liquid medicine, blood and body fluid. One end of the needle holder 2 is inserted and fixed at the rear end, and the other end is connected with the infusion device; the spring 4 is a compression spring made of stainless steel, the length of which is greater than the length of the needle tube 1; the shielding sleeve 5 is flexible The transparent hollow tube made of material has a front port portion wall reduced to 5a and an opening diameter equal to or larger than the outer diameter of the needle tube 1; the outer side of the front portion of the shielding sleeve 5 has at least one abduction fin to form an operating handle 5b In the lower section of the shielding sleeve 5, there is a pair of upper and lower opening windows 5d, and the thin tube walls on both sides of the opening window form a connecting side belt 5e; the breaking cut-off clamp 6 is a shear breaking-off function with a self-locking check function. Clip, it can be made of hard material or metal material.

Fig. 3 is a schematic view showing the structure of a needle holder 2 of a safety type venipuncture needle according to the present invention, wherein 3-1 shows an external structure, and 3-2 is a sectional view of A-A of 3-1. Referring to 3-1 and 3-2, the needle hub 2 has a cylindrical shape with an outer diameter Z, a through hole 2b in the front end thereof, and a diameter equal to or larger than the outer diameter of the needle tube 1. The outer surface of the front portion of the needle holder 2 has a For the longitudinal protrusion 2a, the spacing is Z1; the horizontal direction of the two protrusions is aligned with the direction of the blade 1 of the needle 1 (in conjunction with Figure 2); the outer diameter of the rear of the needle 2 is reduced, and the tube 3 is inserted and fixed. (Combined with Figure 2).

4 is a schematic structural view of a shield sleeve 5 of a safe type of venous penetrating needle according to the present invention, wherein 4-1 shows the cross-sectional structure of the shield sleeve 5, 4-2 is a BB cross-sectional view of 4-1, 4-3 The three-dimensional structure of the shield sleeve 5 is shown. Referring to 4-1, 4-2 and 4-3, the shielding sleeve 5 is a hollow tube made of a flexible transparent material, the wall of the front opening tube is reduced to 5a, and the diameter of the pupil is equal to or larger than the outside of the needle tube 1. The inner diameter d0 of the front section of the shielding sleeve 5 is equal to or slightly larger than the outer diameter of the spring 4; at least one abduction fin on both sides of the middle front section of the shielding sleeve 5 becomes the operating handle 5b _; in the middle front section of the shielding sleeve 5 The inner diameter D is equal to or slightly larger than the cylindrical diameter Z of the front section of the needle hub 2; in the middle front section of the shield sleeve 5, the inner side wall has a pair of semicircular longitudinal grooves 5c whose maximum spacing D1 is equal to or slightly larger than the needle seat 2 The spacing Z1 of the two longitudinal protrusions 2a of the outer wall of the front section, and the line connecting the two longitudinal grooves 5c is parallel to the plane of the flat handle 5c; the diameter D2 of the middle and rear sections of the shielding sleeve 5 is equal to or slightly larger than the needle The spacing Z1 of the two longitudinal protrusions 2a on the side of the seat 2, at the end of the shielding sleeve 5, the tube wall has two laterally opening windows 5d corresponding to a length of about 3 mm, and the thin tube walls on both sides of the window 5d are formed. 5E side _band; in front of the window casing wall thickening 5d, 5f so that there is less than the inner diameter of the cannula hub both longitudinal front stage 2 Projecting ridge distance between Zl 2a. (Combined with Figure 2). Fig. 5 is a schematic view showing the structure of a disconnecting cut-off clip 6 of a safe type of venous penetrating needle according to the present invention, wherein 5-1 shows a three-dimensional structure thereof, and 5-2 is a sectional view of 5-1. Referring to 5-1 and 5-2, the breaking cut-off clamp 6 is made of a hard material or a metal material, and has a U-shaped structure between the upper plate 61 and the lower plate 62, and has a circular hole at the bottom of the valley (for softening) The tube 3 passes through; a pair of plungers 6a having a check fastener in a direction corresponding to the outer edge of the upper plate and the lower plate, can be inserted into the corresponding wedge-shaped holes 6b of the lower plate to form a self-locking return structure; There is a curved pad 6c corresponding to each of the front ends of the upper and lower plates. As the upper and lower plates 61, 62 are closed, the two curved pads 6c can form a cut-off clamp for the clamped hose 3. 6); At the front end of the upper and lower plates of the outer side of the cut-off clip, there are a pair of intersecting shear plates 6d and 6d' which are mutually but in close contact with each other (they are similar to the two cutters of the cutting machine or the scissors).

Figure 6 shows the overall structure of the first embodiment of the safe venous penetrating needle of the present invention; as can be seen from Figure 6, the puncture needle 1 is adhered to the inner hole of the front end of the needle hub 2, and the tip end is a venous penetrating needle tip la; The rear end of the seat 2 is inserted and fixed to one end of the hose 3; the spring 4 is placed on the outer surface of the piercing needle, and the shielding sleeve 5 is placed on the outer surface of the spring 4, the needle tube 1, the needle seat 2 and the hose 3, and The spring 4 is compressed in the front end of the inner hole of the shielding sleeve 5 and the space formed by the front end of the needle holder 2 and the needle tube 1; the end of the shielding sleeve 5 is bonded to the surface of the hose 3 by high frequency heat bonding (may also be bonded by other means) ) to keep the compression of the spring 4; the sheath 0 covers the front end of the shielding sleeve 5 to protect the puncture needle tip la; (in conjunction with Figs. 3 and 4) the two protrusions 2a of the front side of the needle holder 2 are inserted In the longitudinal groove 5c of the inner section of the front middle section of the shield sleeve 5, horizontal positioning is achieved in the direction of the tip end la. The breaking cut-off clamp 6 is placed at the end of the shield sleeve 5, and the cut-off clip is fitted in the upper and lower windows 5d of the rear section of the shield sleeve 5. Both the hose 3 and the shield sleeve 5 are transparent tubes made of flexible material that can be bent for clinical operation without affecting the fixation of the venipuncture needle in the blood vessel. The above configuration constitutes the entire structure of the first embodiment of the safety venipuncture needle of the present invention.

Figure 7 shows the safety of the venipuncture needle after clinical use, the puncture needle structure is destroyed, the needle tube 1 is completely covered by the shield sleeve 5, and the complete protection is obtained; the hose 3 is completely closed by the cut-off clamp, so that residual liquid, blood or The body fluid can not overflow and flow, and the structure is effectively controlled. As can be seen from Fig. 7, when the clinical use (transfusion, infusion of drug solution, blood collection, collection of body fluid samples, puncture treatment) is completed, the finger is pressed and pressed off the cutting clip 6, so that the upper and lower plates are closed inwardly, The thin tube side belt 5e on both sides of the window 5d of the shield sleeve 5 can be sheared off by the breaking shear plates 6d and 6d', and the inner cavity of the hose 3 is pressed and closed to cut off. Since the shielding sleeve 5 loses the involvement of the hose 3, under the force of the spring 4, the shielding sleeve 5 moves forward rapidly, completely covering the puncture needle tip la until the narrowing portion 5f of the inner wall of the rear section of the shielding sleeve 5 and the needle The longitudinal protrusions 2a of the outer side wall of the front end of the seat 2 are blocked from each other and stopped; the shield sleeve 5 is completely covered with the needle tip la without excessive advancement and falling off. in this way It eliminates the risk of needle injuries from medical personnel. (In conjunction with FIGS. 5 and 6), since the plunger 6a having the check fastener between the upper and lower plates acts on the wedge-shaped hole 6b, the closing effect of the inner cavity of the hose 3 by the closing action of the cut-off clamp is continuously maintained, so that The liquid medicine, blood or body fluid in the hose can not overflow and flow, eliminating the chance of contamination and spread of pathogens and reducing the occurrence and spread of blood-borne diseases.

FIG. 8 is an exploded perspective view showing the entire structure of the disconnecting clip 6 according to the second embodiment of the present invention; FIG. 9 is a schematic view showing the structure of the button of the second embodiment of the present invention; The cylinder 8 and the base 9 are formed together. The button 7 is a T-shaped cylinder having a flat end at its upper end and a plurality of semi-circular protrusions on its circumferential edge for rotation control; an indication arrow 7A on the surface; an upper portion of the middle portion of the button 7 having an annular tooth 7B, The inner diameter of the largest diameter cylindrical body 8 of the tooth tip; above the annular tooth 7B, there are two symmetrical two cutting teeth 7C (see Fig. 9). The maximum diameter of the tooth tip is also the inner diameter of the cylindrical body 8; the lower tooth surface of the annular tooth and the cutting tooth are inclined upward, and the upper tooth surface is flat. In the lower part of the button 7, there is a circular plane 7D, the inner diameter of the outer diameter cylinder 8 of the plane; the plane is symmetrically cut on both sides in the axial direction in the direction opposite to the cut-off tooth 7C by 90°, and the plane 7D is cut. a minimum spacing of the upper end limiting teeth 8B of the width cylinder 8; a rectangular pressing plate 7E having a curved groove 7F at the bottom bottom surface of the pressing plate 7 and a width of the curved groove 7F The outer diameter of the infusion hose; the width of the pressure plate 7E on the curved groove surface W protects the outer diameter of the sleeve. The width M of the end of the pressure plate 7E to the curved groove side 7F is larger than the wall thickness of the protective sleeve (greater than the width of the protective sleeve side cable).

The cylinder 8 is a circular tube structure, the upper half of which has a symmetrical over-centered slit 8A, and the upper edge inner wall perpendicular to the quilting 8A, having two symmetrical limiting teeth 8B with the upper teeth facing downward Tilt, lower tooth surface level; distance between the two limiting teeth 8B of the ring tooth 7B of the button 7 and the root diameter of the cutting tooth 7C; the distance between the two limiting teeth 8B and the plane 7D of the lower portion of the button 7 are cut The width of W. The cylinder wall in the direction corresponding to the limiting tooth 8B in the lower portion of the cylinder 8 has a symmetrical through-groove 8C through the center line, and the upper portion of the groove is semi-circular, and the diameter thereof is slightly smaller than the outer diameter of the protective sleeve. The lower end of the side wall of the groove 8C has a symmetrical horizontal groove 8D.

The base 9 is a disc structure having a plurality of semicircular protrusions on its periphery. The surface of the cylinder has a cylindrical protrusion, and in the middle of the protrusion of the cylindrical table, there is a horizontal groove 9A of the axis, the diameter of which is smaller than the diameter of the infusion hose. There is a recess 9B in the middle of the cylindrical table on both sides of the groove 9A, so that the cylindrical table is U-shaped in the longitudinal direction of the groove; the width of the recess 9B is greater than or equal to the thickness of the lower end plate 7E of the button 7; The two ends of the groove 9A extend outwardly with a protrusion 9C lower than the column, and the portion also has a groove 9E having a diameter greater than or equal to the outer diameter of the protective sleeve; the distance between the two side walls of the protrusion 9C is equal to the lower portion of the barrel 8 The width of the groove 8C is defined; and the side walls at the lower end of the projection 9C each have a lateral projection 9D which is matched with the lateral groove 8D at the lower end of the groove 8C of the lower portion of the cylindrical body 8 to form a mutual fitting. Figure 10 is a schematic view showing the overall structure of the infusion hose and the shield sleeve of the venipuncture needle of the present invention according to the second embodiment of the present invention; as shown in the figure, the button 7 has its arrow and the upper end of the barrel 8 The corresponding direction of the slit 8A is inserted into the cylindrical body 8, enters the first annular tooth 7B, and is interlocked with each other; the infusion hose 3 and the fenestration side belt 5e of the shielding sleeve 5 are positioned and fastened to the lower end of the cylindrical body 8 to be opened. In the groove 8C, the cylindrical table groove 9A of the base 9 is further engaged with the lower end groove 8C of the cylindrical body 8 in the longitudinal direction, so that the lateral protrusion 9D on both sides of the surface protrusion 9C of the base 9 and the lower end of the cylindrical lower end slot 8C are closed. The lateral grooves 8D of the side walls are fitted to each other. 8 and 9, since the arrow 7A of the button 7 coincides with the direction of the cut-off tooth 7C, and is in the direction of the upper end slit 8A of the cylinder 8, it is 90 degrees out of contact with the limit tooth 8B at the upper end of the cylinder, so that At any time, when the button 7 is pressed, the cut-off tooth 7C of the button and the limit tooth 8B of the barrel 8 cannot be blocked, that is, the infusion hose 3 cannot be closed and closed; likewise, due to the lower end of the button 7 of the press plate 7E The narrow portion corresponds to the long axis direction of the infusion tube 3, and the thickness of the pressure plate 7E is smaller than the diameter of the infusion tube 3, which is inevitably smaller than the inner diameter of the protective sleeve 5, so that no matter how the pressure plate 7E moves down, The squeezing and cutting of the sash side belt 5e of the shielding sleeve 5 is not formed, so that the erroneous triggering is not caused, and the protective sleeve is actuated and the infusion hose is cut off; and the insurance function for preventing false triggering is provided.

Figure 11 is a cross-sectional view of the second embodiment of the present invention, taken along the long axis cross section of the infusion hose, when the cutoff cutoff is ready for the cutoff operation;

Figure 12 is a longitudinal sectional view of the second embodiment of the present invention along the long axis of the infusion hose when the cut-off operation is ready to be performed; after the infusion is completed, the button 7 has to be rotated by 90 degrees (the surface of the key tooth can be felt) The positioning of the tiny protrusions and the tiny depressions on the bottom surface of the cylindrical teeth are intermeshing). Referring to Fig. 11 and Fig. 12, the arcuate groove 7F of the lower end pressing plate 7E corresponds to the groove 9A of the base protrusion, and the cutting tooth 7C of the upper portion of the button corresponds to the limiting tooth 8B of the inner wall of the upper end of the cylinder. The side cable 5E of the protective sleeve window is placed between the base 9 and the pressure plate 7E. The distal end of the protective sleeve 5 is bonded to the infusion hose 3.

Figure 13 is a longitudinal cross-sectional view of the second embodiment of the present invention along the long axis of the infusion hose after the cut-off pressing operation is performed, the shield sleeve 5 is squeezed and cut off, and the infusion hose is pressed by the button; As can be seen from the figure, when the infusion is completed, when it is confirmed that the trigger is required, the button is pressed down forcefully, and the button is moved downward, so that the cut-off tooth 7C enters the lower limit of the limit tooth 8B of the upper end inner wall of the cylindrical body 8 to form mutual lock. At the same time, the pressure plate 7E is moved down, and the side cable 5E of the protective sleeve can be pressed, cut, and disconnected, so that the protective sleeve 5 is moved forward in the direction of the arrow under the external force of the (spring) to protect the venous puncture tip. The corresponding purpose of the invention. At the same time, the lowering of the pressing plate 7E causes the arcuate groove 7F at the lower end of the pressing plate to be narrowed corresponding to the curved groove 9A of the base 9, and the infusion hose 3 can be closed and closed to terminate the flow of the liquid.

After use, the safety device is activated. Since the venous needle can be quickly removed from the blood vessel by the spring, it is automatically retracted into the shielding sleeve. When the needle is released, the patient's pain can be eliminated and the work efficiency can be improved. The technical solutions described in the present invention, any similar variations that can be achieved by those skilled in the art through the modifications, will fall within the technical scope of the present invention.

Industrial applicability

The safety venipuncture needle of the invention has a puncture needle tip shielding and a liquid conduit cutting device, and is safe, reliable, simple, practical, and inexpensive, can simplify clinical operation procedures, improve work efficiency, eliminate needle stick injury, prevent blood and body fluids. The characteristics of the overflowing rogue can alleviate the patient's pain and can be used in the process of collecting venous blood, injecting liquid medicine, transfusion, tissue specimen collection and treatment.

Claims

1. A safe venipuncture needle, including sheath (0), needle tube (1), needle seat (2), hose (3), spring (4), shielding sleeve (5), breaking cut-off clamp (6); It is characterized in that: the needle tube (1) is inserted and fixed in the central hole (2b) at the front end of the needle holder (2), and the diameter of the rear portion of the needle holder (2) is reduced and glued to the hose (3). The shielding sleeve (5) is placed on the outer surface of the spring (4), the needle tube (1), the needle seat (2), the hose (3), and the spring (4) is compressed in the front section of the shielding sleeve (5) In the space formed with the front end of the needle seat; the end of the shielding sleeve (5) and the hose (3) are bonded to each other by high-frequency heat sealing or other means to maintain the compression of the spring (4); the breaking cut-off clamp (6) At the end of the shielding sleeve, the breaking shear plate (6d, 6d') of the cutting-off clamp is inserted into the upper and lower opening window (5d) at the end of the shielding sleeve (5).

2. A safety venous penetrating needle according to claim 1, wherein: the needle base (2) has a pair of longitudinal semicircular protrusions (2a) on both sides of the front section, and the lower part of the needle seat (2) is tapered. The plug is glued to the hose (3) and the plane of the tip edge (la) is parallel to the line connecting the two longitudinal projections (2a).

3. A safety venipuncture needle according to claim 1, wherein: the shielding sleeve (5) has a hollow structure, and the front end opening (5a) is reduced, and the diameter thereof is equal to or slightly larger than the needle tube (1). The outer diameter d0 of the front section of the shielding sleeve (5) is equal to or slightly larger than the outer diameter of the spring (4); the outer side of the middle front section of the shielding sleeve (5) has at least one flat protruding flat structure to form the operating handle (5b) In the middle anterior segment of the shielding sleeve (5), the lumen diameter D is equal to or slightly larger than the cylindrical diameter Z of the front section of the needle hub (2); in the middle anterior segment of the shielding sleeve (5), the inner side wall has a pair of semicircles The longitudinal groove (5c) has a maximum spacing D1 equal to or slightly larger than the spacing Z1 of the two longitudinal projections (2a) of the outer side wall of the front portion of the needle seat (2), and the connection and flattening of the two longitudinal grooves (5c) The plane of the handle (5c) is parallel; the diameter D2 of the middle and rear section of the shielding sleeve (5) is equal to or slightly larger than the spacing Z1 of the two longitudinal projections (2a) on the side of the needle seat (2), in the shielding sleeve (5) At the end of the pipe, the pipe wall has two horizontally open windows (5d) with a length of about 3mm, and the windows (5d) are thin on both sides. It is formed with a side wall _(5E); the window (5d) of the front casing wall thickening, so that where the inner diameter of the sleeve (5F) is smaller than the needle hub (2) the distance between the two longitudinal projecting ridge preceding stage (2a) Zl.

4. A safety venipuncture needle according to claim 1 or 2 or 3, wherein: the breaking cut-off clip (6) is made of a hard material or a metal material, and the upper and lower plates have a U-shaped structure. The bottom of the valley has a round hole through which the hose (3) passes, so that it is placed at the end of the shielding sleeve (5), and a pair of plugs with a check buckle are inserted at the front end of the cutting plate of the cut-off clip (6). The rod (6a) can be inserted into the wedge-shaped hole (6b) at the front end of the lower plate to form a self-locking return structure; a pair of curved pads (6c) are formed in the middle of the front end of the upper and lower plates to form a pair of hoses (3) Cut-off clip; On the outside of the cut-off clip, the front end of the upper and lower plates each have a pair of intersecting shear plates (6d, 6d') which are in contact with each other but are in close contact with each other.

5. A safety venipuncture needle according to claim 1 or 2 or 3, wherein: The breaking cut-off clamp (6) is composed of a button (7), a cylinder (8), and a base (9);

The button 7 is a T-shaped cylinder having a flat end at its upper end and a plurality of semi-circular protrusions on its circumferential edge for rotation control; an indication arrow 7A on the surface; an upper middle portion of the button 7 having an annular tooth 7B, The inner diameter of the largest diameter cylinder 8 of the tooth tip; above the annular tooth 7B, there are two symmetrical two cutting teeth 7C across the axis; the inner diameter of the largest diameter cylindrical body 8 of the tooth tip; the lower tooth surface of all the teeth are upward Inclining, the upper tooth surface is a flat surface; in the lower portion of the button 7, there is a circular plane 7D, the inner diameter of the outer diameter cylindrical body 8 of the plane; the plane is symmetrical in the axial direction on both sides in the direction opposite to the cut-off tooth 7C by 90° Cutting, the minimum spacing of the upper limit teeth 8B of the upper end of the cylindrical body 8 of the plane 7D after cutting; a rectangular pressing plate 7E under the button 7 and the above-mentioned cut plane 7D, the bottom surface of the pressing plate has a curved groove 7F The width of the groove 7F is the outer diameter of the infusion hose; the width of the pressure plate 7E on the curved groove surface\^ protects the outer diameter of the sleeve; the width M of the end of the pressure plate 7E to the curved groove side 7F is larger than the shielding sleeve Wall of the tube (Larger than the width of the side shield with the cannula).

The cylinder 8 is a circular tube structure, the upper half of which has a symmetrical over-centered slit 8A, and the upper edge inner wall perpendicular to the slit 8A, has two symmetrical limiting teeth 8B, the upper teeth of the teeth face down Tilt, lower tooth surface level; distance between the two limiting teeth 8B of the ring tooth 7B of the button 和 and the root diameter of the cutting tooth 7C; the distance between the two limiting teeth 8B and the plane 7D of the lower part of the button 7 are cut The width W; the wall of the tube in the direction corresponding to the limiting tooth 8B in the lower portion of the cylinder 8 has a symmetrical through-groove 8C through the center line, the upper portion of the groove is semi-circular, and the diameter thereof is slightly smaller than the outer diameter of the protective sleeve a diameter, at the lower end of the side wall of the slot 8C, there is a symmetrical horizontal groove 8D;

The base 9 is a disc structure having a plurality of semicircular protrusions on its periphery. The surface of the cylinder has a cylindrical protrusion, and in the middle of the protrusion of the cylindrical table, there is a horizontal groove 9A of the axis, the diameter of which is smaller than the diameter of the infusion hose (3); and a depression in the middle of the cylindrical table on both sides of the groove 9A 9B, the cylindrical table is U-shaped in the longitudinal direction of the groove; the width of the recess 9B is greater than or equal to the thickness of the lower end plate 7E of the button 7; and the lower end of the cylindrical table groove 9A of the base 9 is outwardly extended to have a lower column The protrusion 9C of the table also has a groove 9E having a diameter greater than or equal to the outer diameter of the protective sleeve; the distance between the two side walls of the protrusion 9C is equal to the width of the lower groove 8C of the barrel 8; and the side wall at the lower end of the protrusion 9C Each has a lateral projection 9D which is matched with the lateral groove 8D at the lower end of the groove 8C of the lower portion of the cylindrical body 8, so that mutual fitting can be formed.