Anti-puncture apparatus for medical puncture device, and medical injection and infusion apparatus

Abstract

An anti-puncture apparatus for a medical puncture device, and a medical injection and infusion apparatus. The anti-puncture apparatus for a medical puncture device comprises a sheath (4), a puncture needle, and a retainer elastic piece (2); the retainer elastic piece (2) is provided in the sheath (4), and the puncture needle penetrates between the retainer elastic piece (2) and the sheath (4). The described apparatus adopts an integrally formed retainer elastic piece (2); under the directional action of a base (3) and the cooperation of the sheath (4), the retainer elastic piece (2) cooperates with a blood return recess (101) of a tube body (1) of the puncture needle to achieve 360° non-dead angle rapid activation, and the puncture needle does not need to be processed to have a local deformation feature in order to activate a protective apparatus, thereby achieving "non-destructive protection" of the puncture needle and maintaining the integrity of the functional application of the puncture needle.

Description

Anti-puncture device for medical puncture device and medical injection device Technical Field

[0001] The present invention relates to the field of medical devices, in particular to a puncture prevention device for a medical puncture instrument and a medical infusion device. Background Art

[0002] Occupational exposure and infection among healthcare workers due to unsafe infusions persist worldwide. Medical personnel face the risk of sharps injuries when using puncture instruments. Safe infusion is a fundamental path and effective measure to prevent the spread of infection and ensure patient safety and the occupational safety of medical personnel. In recent years, with the increasing awareness of safety protection and the continuous development of technical means and clinical medical research, sharps injury protection devices have been integrated into infusion device products (such as injection needles, infusion needles, indwelling needles, vascular puncture needles, etc.), providing new paths and methods for achieving safe infusion.

[0003] Among them, indwelling catheters are typically placed using the CON (catheter over needle) method, hereinafter referred to as the CON method. This method is increasingly used and is often combined with the Sedinger technique. For example, patent CN105611962B discloses a catheter insertion device that can single-handedly insert a catheter into a patient's blood vessels. This device combines the original catheter, needle, and guidewire into a single device. The catheter, needle, and guidewire are arranged concentrically from the outside to the inside. The Sedinger technique is used to replace the puncture needle and guidewire to implant the catheter. The guidewire must pass through the inside of the needle of this device, and the inner diameter of the needle must be precisely matched to the outer diameter of the guidewire. Especially for small-sized needles, to avoid the guidewire being unable to pass through and affecting the performance of the device, the matching accuracy between the inner diameter of the needle and the outer diameter of the guidewire must be further improved.

[0004] At present, the processing method of the sharp object puncture protection device of the infusion device product is basically to pre-process the local deformation features such as "flat position" and "indentation" on the needle tube, and then set a "blocking piece" matching the outer diameter of the needle tube and a compressed "protective spring piece". The working principle of this structural type is: after the device has completed its intended use, the needle tube is pulled during the removal process. When the local deformation position on the needle tube reaches the fixed position of the "blocking piece", the compressed "protective spring piece" loses the top pressure resistance of the needle tube and releases the restoring elastic force, quickly recovers to cover the needle tip, and activates the protective device to play a protective role; such as the utility model patent with the authorization announcement number: CN218944044U, and the patent name is "Locking tip device for puncture or liquid infusion needle body". When in use, the locking tip assembly passes through the through hole on the fixed plate When the needle handle is pulled out of the needle tube, the front needle tip of the needle tube retreats into the locking tip assembly and is wrapped by the cavity formed by the first locking tip cover body and the second locking tip cover body in the locking tip assembly. Due to the flattening part preset on the needle tube that matches the through hole of the fixing plate, the locking tip assembly is finally brought out by the needle tube, thereby shielding the needle tip part of the puncture or infusion needle body, thereby avoiding stabbing the operator when not in use; for example, the utility model patent with the authorization announcement number: CN203577057U, and the patent name is "A kind of anti-needlestick intravenous indwelling needle", an anti-needlestick safety device is provided on the needle tube between the needle seat and the catheter seat, and an indentation is provided near the needle tip of the needle tube. When the needle seat and the needle tube are pulled out together, the safety clip in the anti-needlestick safety device will block the center hole 3 of the anti-needlestick safety device A end, At the same time, the iron sheet at the B end of the safety device blocks the indentation of the needle tube; in the above patents, it is necessary to pre-process the flattened area or indentation on the needle seat. This pre-processing method achieved by changing the local deformation of the needle tube belongs to "damage protection", that is, by locally processing the needle tube, the inner and outer diameters of the needle tube are locally deformed, so that the inner diameter of the deformed part of the needle tube becomes smaller and the outer diameter becomes larger, thereby losing, affecting and changing the external dimensions and functional applications of the components combined with it, causing some functions to be unable to be realized; for example: when a guide wire needs to pass through the middle of the vascular puncture needle, when the guide wire passes through the local deformation position of the needle tube, due to the smaller inner diameter of the needle tube, it is easy to cause blockage and cannot pass through. Secondly, the processing technology of each component in the structure is relatively complicated (such as the control of the punching force at the 'flat position' and 'indentation', etc.), and the manufacturing cost is high; in addition, this protective device achieved by manufacturing a gear is prone to failure due to the gear components such as the "blocking piece" not corresponding to the needle position or being unstable.

[0005] In order to solve the above-mentioned problem of "damage protection", the solution of the existing technology, such as the utility model patent with authorization announcement number: CN216933402U and patent name "Anti-needlestick protection device" (hereinafter referred to as comparative document 1), is provided in the shell. The elastic limiter is provided with a pinhole and a strip groove communicating with the pinhole and having a width smaller than the outer diameter of the pinhole. A radial groove is provided on the side of the front end of the needle tube. Under ideal conditions, when the needle tube is retracted, the radial groove passes through the pinhole. Since the outer diameter of the needle tube becomes smaller, the elastic limiter is displaced, causing the radial groove of the needle tube to move into the strip groove. Since the width of the strip groove is smaller than the outer diameter of the pinhole, the needle tube is not easy to loosen from the strip groove, which can achieve the effect of anti-needlestick.

[0006] However, this structure still has the following problems in actual operation:

[0007] 1. As shown in FIG1 , the automatic rebound section of the elastic limiter always presses against the inner wall of the housing, and the strip-shaped slot presses against the needle tube, forming a reaction force with the "support arm" structure of the elastic limiter on the other side of the automatic rebound section, which constitutes a complex combined force system. As a result, the axial movement friction resistance between the needle tube, the elastic limiter and the housing is large, and problems such as jamming are prone to occur. At the same time, since both sides of the elastic limiter always abut against the inner wall of the housing, the housing itself cannot achieve relative displacement with the needle tube. Therefore, under the premise that the needle tube does not move, the relative retreat of the needle tube cannot be achieved by pushing the housing until it covers the needle tip. The only way to achieve anti-needlestick protection is to pull the needle tube axially.

[0008] 2. Due to the shape and structure of the strip groove of the elastic limiter (the width of the strip groove is smaller than the pinhole diameter) and the radial groove of the needle tube, only "directional displacement activation protection" can be achieved, that is, only when "the plane where the radial groove is located is in the same plane as the length direction of the strip groove, so that the radial groove contacts the strip groove" (reference document 1, specification, paragraph 1).

[0009] segment), in order to achieve engagement, it is impossible to activate the protection by displacement 360° along the radial direction of the needle tube;

[0010] 3. Due to the intersecting force between the automatic rebound section of the elastic limiter and the "support arm" structure, the reaction force generated by the "support arm" structure will offset the tilting force generated by the compression deformation of the automatic rebound section due to the influence of the structural configuration. Therefore, the deformation speed of the automatic rebound section is hindered and delayed. At the moment of needle removal, if the response speed of the deformation of the automatic rebound section is slower than the displacement speed of the needle removal, the radial groove of the needle will pass over the needle hole of the elastic limiter, resulting in protection failure.

[0011] 4. The protective device utilizes the deformation force generated by the compression deformation of the automatic rebound section of the elastic limiter to provide displacement and positioning protection when passing through the radial groove of the needle tube. The elastic limiter is required to have a fast response speed in elastic deformation. Therefore, if this type of structure is to be used in instrument puncture needle tube products with only a very small assembly space, the elastic limiter needs to be made of a material with good elastic deformation. At the same time, in order to improve the sensitivity of the structure, the thickness of the plate needs to be reduced. The material is easy to deform and the material thickness is reduced. In addition, the setting of the strip slot increases the hollow area, which further weakens the structural support performance and structural strength. Only the strip slot with smaller structural strength is relied upon to achieve positioning and blocking. When the needle is pulled out with great force, it is easy to directly stretch the strip slot, causing it to widen and pass through the needle tube, resulting in failure.

[0012] Summary of the Invention

[0013] Therefore, in order to solve the above problems, the present invention provides a puncture prevention device for a medical puncture instrument.

[0014] The present invention is achieved through the following technical solutions:

[0015] A puncture prevention device for a medical puncture device, comprising a sheath, a puncture needle, and a retaining frame shrapnel, wherein the retaining shrapnel is arranged in the sheath, and the puncture needle is inserted between the retaining frame shrapnel and the sheath;

[0016] The protective cover comprises a main body and a base arranged at the bottom of the main body, wherein the base is provided with a limited step on a first side;

[0017] The puncture needle includes a hollow tube body, a needle located at one end of the tube body, and a blood return groove arranged on the periphery of the tube body;

[0018] The retainer spring piece includes a fixing portion, a bottom hole is provided on the fixing portion, a support arm is provided on a first side of the fixing portion, and an elastic arm is provided on a second side, the support arm includes a first side arm bent upward from one side of the fixing portion and a guide portion bent from the top of the first side arm and parallel to the fixing portion, a strip groove is provided on the support arm, the strip groove connects the first side arm and the guide portion, and an open guide hole is further provided on the guide portion, the open guide hole is provided at the end of the strip groove, an end of the open guide hole connected to the strip groove is formed with an opening, and the open guide hole is coaxially arranged with the bottom hole;

[0019] The width of the tube body of the puncture needle at the blood return groove is less than the opening width of the open guide hole and less than the outer diameter of the tube body of the puncture needle and less than the width of the strip groove;

[0020] In the initial state, the first side of the fixing portion is placed flat on the limiting step, the tube body of the puncture needle coaxially passes through the bottom hole and the open guide hole, the blood return groove is located at the top of the open guide hole, and the elastic arm is elastically abutted against the tube body of the puncture needle;

[0021] In the activated state, the blood return groove on the puncture needle retreats to the height of the open guide hole and moves from the opening of the open guide hole to the strip groove, the retaining frame spring is tilted toward the second side and the fixing part leaves the limiting step surface, the bottom hole is tilted along with the fixing part and the hole wall of the bottom hole applies a cross torque to the outer periphery of the tube body of the puncture needle and holds the tube body tightly, the elastic arm is still in contact with the tube body of the puncture needle and the torque at the contact between the two increases as the retaining spring is tilted.

[0022] Preferably, both sides of the opening between the open guide hole and the strip-shaped groove are symmetrically arranged arc-shaped transition surfaces.

[0023] Preferably, two reinforcing arms are provided at both ends of the fixing part between the supporting arm and the elastic arm, the thickness of the reinforcing arms is greater than the thickness of other positions of the fixing part, each reinforcing arm is provided with a first side shoulder on the side close to the supporting arm, and each reinforcing arm is provided with a second side shoulder on the side close to the elastic arm, and the fixing part, support arm, elastic arm and reinforcing arm are formed as one piece.

[0024] Preferably, the elastic arm is overall "S"-shaped, including a second side arm bent upward from one side of the fixed part, and the top of the second side arm is bent toward the second side to form a positioning part. In the initial state, the connection between the second side arm and the positioning piece elastically abuts against the outer periphery of the tube body of the puncture needle.

[0025] Preferably, the second side arm includes a first connection portion connected to the positioning portion, and a second connection portion connected to the fixing portion, a necking portion is provided between the first connection portion and the second connection portion, and the necking portion gradually narrows from the first connection portion to the second connection portion, the width of the first connection portion is equal to the maximum width of the necking portion, and the width of the second connection portion is equal to the minimum width of the necking portion.

[0026] Preferably, the first side arm is inclined toward the second side, the second side arm is inclined toward the first side, and the connection point of the second side arm is located at a plane where the side edge of the first side intersects with the bottom hole.

[0027] Preferably, two pressure columns are provided on the second side of the inner wall of the sheath, the distance between the two pressure columns is equal to the distance between the two reinforcing arms, and the two pressure columns are provided on the top of the second side shoulders of the two reinforcing arms in a one-to-one correspondence.

[0028] Preferably, the base is provided with a holder on both sides of the limiting step, the top of the holder is provided with a limiting groove, the outer periphery of the holder is provided with a buckle, and the outer periphery of the sheath is provided with a bayonet matching the buckle.

[0029] Preferably, a first through hole is provided on the base, a sleeve is provided on the top of the sheath, a puncture channel is built into the sleeve, and the first through hole and the puncture channel are coaxially arranged.

[0030] A medical infusion device comprises the above-mentioned anti-puncture device for the medical puncture instrument.

[0031] The beneficial effects of the technical solution of the present invention are mainly reflected in:

[0032] 1. When the puncture needle needs to activate the lock, the retainer spring is tilted. At this time, the inclined cross torque generated by the bottom hole position holds the tube body tightly for limit protection, so that the bottom hole changes from "guide sliding mode" to "inclined cross torque holding and locking mode". In the inclined cross torque holding and locking mode, the bottom hole presses and locks the tube body 360° along the outer circumference of the tube body and maintains its position. At this time, no matter whether the puncture needle continues to be pushed or pulled out axially, the bottom hole always remains in the inclined cross torque holding and locking mode to press and lock the tube body and maintain its position. The greater the external force, the greater the self-locking holding force. At this time, the needle tip of the puncture needle also retracts into the sheath to prevent the needle tip from being exposed.

[0033] 2. The opening width of the open guide hole is smaller than the outer diameter of the tube body of the puncture needle. Therefore, in the initial state, the tube body of the puncture needle can be stably fixed in the open guide hole and will not move from the opening of the open guide hole to the strip groove. When the position of the blood return groove moves to the guide hole during development, since the width of the tube body at this position is smaller than the opening width of the open guide hole, the tube body can pass through the opening 360° and move into the strip groove without the need for "directional activation", ensuring 360° tilt displacement limit protection without dead angles, greatly improving the flexibility and safety of the device.

[0034] 3. When the elastic arm and the puncture needle are installed, they generate a deformation force through compression deformation, and apply this deformation force to the abutment with the tube body. In the initial state, the elastic retaining force of the tilting deflection is guided by the structural shape under the limiting action of the bottom hole and the open guide hole; in the activated state, the puncture needle is pulled back or the sheath is pushed while the puncture needle remains stationary to achieve relative movement of the tube body until the guide groove moves to the open guide hole. The open guide hole loses the coaxial constraint on the puncture needle, and the elastic retaining force released by the elastic arm quickly pushes the tube body to move toward the strip groove, and causes the retaining frame spring to tilt and deflect to avoid jamming.

[0035] 4. The elastic arm is provided with a gradually narrowing neck portion between the first connecting portion and the second connecting portion, which can further improve the elastic sensitivity of the elastic arm. When the puncture needle is installed in the retaining spring, the elastic arm is stretched open by the puncture needle, and a deformation force is generated through compression deformation, and then a reaction force is applied to the puncture needle. The reaction force pushes the puncture needle to deflect in the direction of the strip groove. The width of the strip groove is greater than the outer diameter of the tube body of the puncture needle. When an inclined displacement occurs, no intersecting dislocation interference will be caused, which can improve the sensitivity and force accuracy of the overall structure.

[0036] 5. Two reinforcing arms are provided at both ends of the fixed part of the retainer shrapnel between the support arm and the elastic arm. The fixed part, the support arm, the elastic arm and the reinforcing arm are integrally formed. The reinforcing arm can improve the strength of the bottom of the retainer shrapnel. Through this local reinforced structure, the overall weight and volume of the retainer shrapnel can be reduced while the ability to resist external force damage and failure is multiplied.

[0037] 6. A limiting step is provided on the first side of the base. In the initial state, the first side of the fixing portion is flat on the limiting step, while the second side of the base is not provided with a limiting step, thereby providing space for the retaining frame spring to subsequently tilt toward the second side. At the same time, pressure columns are provided on the inner wall of the sheath and on the top of the second side shoulders of the two reinforcing arms. When the retaining frame spring is tilted, even if the puncture needle is pushed outward, the pressure columns provided on the inner wall of the sheath will abut against the two second side shoulders of the reinforcing arm to prevent the needle tip of the puncture needle from being exposed, thereby providing a secondary protection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a schematic diagram of the stress state of each structure of the reference document 1 in the background art;

[0039] FIG2 is a schematic structural diagram of the anti-puncture device for a medical puncture device in an initial state (partially cut away);

[0040] FIG3 is a schematic structural diagram of the anti-puncture device for a medical puncture device in an activated state (partially cut away);

[0041] FIG4 is a cross-sectional view of the medical puncture device for preventing puncture wounds in the initial state;

[0042] FIG5 is a cross-sectional view of the anti-puncture device for a medical puncture device in an activated state;

[0043] FIG6 is an enlarged view of portion A in FIG5 ;

[0044] Figure 7 is a schematic structural diagram of the base;

[0045] FIG8 is a schematic diagram showing the stress state of the bottom hole of the retainer spring and the tube body of the puncture needle in the activated state;

[0046] Figure 9 is a schematic diagram of the structural state of the sheath;

[0047] Figure 10 is a perspective view of the retainer shrapnel;

[0048] FIG11 is a side view of a second side of the retainer spring;

[0049] FIG12 is a schematic diagram showing a comparison of the width of the puncture needle tube body between the blood return groove and the opening of the open guide hole;

[0050] FIG13 is a schematic diagram of the disassembled state of each component of the anti-puncture device for medical puncture instrument. DETAILED DESCRIPTION

[0051] To more clearly and in detail illustrate the objectives, advantages, and features of the present invention, the following non-limiting description of preferred embodiments is provided for illustration and explanation. This embodiment is merely a typical example of the application of the technical solution of the present invention. Any technical solution formed by equivalent substitution or equivalent transformation falls within the scope of protection claimed by the present invention.

[0052] It is also stated that in the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] Furthermore, the terms "first" and "second" in this solution are used for descriptive purposes only and should not be construed as indicating or implying a ranking of importance or implicitly specifying the number of technical features shown. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0054] The present invention discloses a puncture prevention device for a medical puncture device, as shown in Figures 2 to 5 and 13, comprising a sheath 4, a puncture needle, and a retainer spring 2, wherein the retainer spring is disposed within the sheath 4, and the puncture needle is disposed between the retainer spring 2 and the sheath 4;

[0055] The sheath 4 includes a main body and a base 3 provided at the bottom of the main body. The base 3 is provided with a limiting step 301 on a first side. In some embodiments, the limiting step 301 is a limiting block protruding from the upper surface of the base 3, with a flat top, which is used to position the retainer spring 2 during assembly.

[0056] The puncture needle includes a hollow tube body 1, a needle head 102 at one end of the tube body 1, and a blood return groove 101 arranged on the periphery of the tube body 1. In some embodiments, a guide wire can be passed through the interior of the puncture needle, and the puncture needle can also be used for injection or infusion; as shown in Figures 10 and 11, the retainer spring 2 includes a fixing portion 201, a bottom hole 202 is provided on the fixing portion 201, a support arm 204 is provided on the first side of the fixing portion 201, and an elastic arm 203 is provided on the second side, and the support arm 204 includes a side of the fixing portion 201. A first side arm bent upward, and a guide portion 209 bent from the top of the first side arm and parallel to the fixing portion 201; a strip groove 205 provided on the support arm 204, the strip groove 205 connecting the first side arm and the guide portion 209; an open guide hole 206 provided on the guide portion 209, the open guide hole 206 being provided at the end of the strip groove 205, an opening 208 being formed at the end where the open guide hole 206 connects to the strip groove 205, and the open guide hole 206 is coaxially arranged with the bottom hole 202;

[0057] The width of the tube body 1 of the puncture needle at the blood return groove 101 is less than the width of the opening 208 of the open guide hole 206 and less than the outer diameter of the tube body 1 of the puncture needle and less than the width of the strip groove 205.

[0058] As shown in FIG12 , the width of the tube body 1 of the puncture needle at the blood return groove 101 is less than the width of the opening 208 of the open guide hole 206 , which means that the outer diameter of the maximum circumscribed circle formed by the connection points of each cross-section of the tube body at the blood return groove is smaller than the width d of the opening 208 of the open guide hole 206 . The shape of the blood return groove can be adjusted as needed and will not be elaborated herein.

[0059] As shown in Figures 2 and 4, in the initial state, the first side of the fixing portion 201 is placed flat on the limiting step 301, the tube body 1 of the puncture needle coaxially passes through the bottom hole 202 and the open guide hole 206, the blood return groove 101 is located at the top of the open guide hole 206, and the elastic arm 203 is elastically abutted against the tube body 1 of the puncture needle;

[0060] As shown in Figures 3, 5, 6 and 8, in the activated state, the blood return groove 101 on the puncture needle retracts to the height of the open guide hole 206 and moves from the opening 208 of the open guide hole 206 to the strip groove 205. The retaining spring 2 tilts toward the second side and the fixing portion 201 leaves the surface of the limiting step 301. The bottom hole 202 tilts along with the fixing portion 201 and the hole wall of the bottom hole 202 applies a cross torque to the outer periphery of the tube body 1 of the puncture needle and holds the tube body 1 tightly. The elastic arm 203 is still in contact with the tube body 1 of the puncture needle and increases the torque at the contact between the two as the retaining spring is tilted.

[0061] Among them, the above-mentioned initial state includes the assembly state of each component of the anti-stab device for medical puncture instruments and the use state of the anti-stab device for medical puncture instruments. The activated state means that after the anti-stab device for medical puncture instruments is used, the puncture needle needs to be retracted, and the blood return groove provided on the periphery of the tube body of the puncture needle is located in the open guide hole, which can activate the state of locking the puncture needle. In the initial state, it is necessary to ensure that the retaining frame shrapnel 2 is placed flat in the sheath 4, so as to ensure that the puncture needle is smoothly extended out of the sheath 4. When use is completed, in the activated state, the retaining frame shrapnel 2 is tilted to lock the tube body 1.

[0062] Among them, the relationship between the width of each position of the puncture needle and the width of the opening 208 of the open guide hole 206 and the strip groove 205 can ensure that the tube body 1 of the puncture needle is stably coaxially arranged in the bottom hole 202 and the open guide hole 206 in the initial state, and ensure that the retaining frame spring piece 2 will not tilt prematurely. In the activated state, when the blood return groove 101 of the puncture needle is located in the open guide hole 206, it can ensure 360° non-dead-angle tilt displacement limit protection, thereby improving the sensitivity and safety of the structure. In a preferred embodiment, the aperture of the open guide hole 206 is the same as the aperture of the bottom hole 202, further improving the stability of the assembly between the tube body 1 of the puncture needle and the retaining frame spring piece 2 in the initial state.

[0063] In some embodiments, as shown in FIG12 , the two sides of the opening 208 between the open guide hole 206 and the strip groove 205 are symmetrically arranged arc-shaped transition surfaces. The setting of the arc-shaped transition surface at the edge of the opening 208 can stably guide the puncture tube body 1 to smoothly enter the strip groove 205 in the activated state, and guide the retaining frame spring 2 to tilt.

[0064] In some embodiments, as shown in Figures 10 and 11, two reinforcing arms 207 are provided at both ends of the fixing portion 201 between the support arm 204 and the elastic arm 203. The thickness of the reinforcing arms 207 is greater than the thickness of other positions of the fixing portion 201. A first side shoulder 2071 is provided on the side of each reinforcing arm 207 close to the support arm 204, and a second side shoulder 2072 is provided on the side of each reinforcing arm 207 close to the elastic arm 203. The fixing portion 201, the support arm 204, the elastic arm 203 and the reinforcing arm 207 are formed as one piece. In a preferred embodiment, the reinforcing arm 207 is formed as one piece by stamping and flanging processing, which is a simple processing method, and the thickness at the position of the reinforcing arm 207 is twice the thickness at other positions of the fixing portion 201.

[0065] In some embodiments, as shown in Figure 11, the elastic arm 203 is overall "S"-shaped, including a second side arm bent upward from one side of the fixing portion 201, and the top of the second side arm is bent toward the second side to form a positioning portion 2031. In the initial state, the connection between the second side arm and the positioning plate elastically abuts against the outer periphery of the tube body 1 of the puncture needle.

[0066] In which, the second side arm includes a first connecting portion 2032 connected to the positioning portion 2031, and a second connecting portion 2034 connected to the fixing portion 201, a necking portion 2033 is provided between the first connecting portion 2032 and the second connecting portion 2034, and the necking portion 2033 gradually narrows from the first connecting portion 2032 to the second connecting portion 2034, the width of the first connecting portion 2032 is equal to the maximum width of the necking portion 2033, and the width of the second connecting portion 2034 is equal to the minimum width of the necking portion 2033.

[0067] In a preferred embodiment, the first side arm is inclined toward the second side, and the second side arm is inclined toward the first side. The connection point of the second side arm is located on a plane where the side edge of the first side intersects with the bottom hole 202, thereby ensuring that when the puncture needle and the retainer spring piece 2 are installed, the elastic arm 203 is deformed after being stretched open by the puncture needle, and exerts an elastic retaining force on the tube body 1 of the puncture needle, ensuring that in the activated state, when the tube body 1 of the puncture needle is located in the open guide hole 206 at the position of the blood return groove 101, the tube body 1 is smoothly pushed into the strip groove 205.

[0068] In some embodiments, as shown in Figure 8, two pressure columns 404 are provided on the second side of the inner wall of the sheath 4, and the distance between the two pressure columns 404 is equal to the distance between the two reinforcing arms 207, and the two pressure columns 404 are provided one-to-one at the top of the second side shoulders 2072 of the two reinforcing arms 207. After the retaining spring 2 is tilted, even if the puncture needle continues to be pushed outward, the lower surfaces of the two pressure columns 404 on the inner wall of the sheath 4 can abut against the upper surfaces of the second side shoulders 2072 of the two reinforcing arms 207, thereby achieving locking. At the same time, the inclined cross force generated by the bottom hole 202 position of the retaining spring 2 on the outer periphery of the tube body 1 locks the puncture tube body 1, thereby realizing a double insurance structure.

[0069] In some embodiments, as shown in Figure 7, the base 3 is further provided with a socket on both sides of the limiting step 301, and a limiting groove 302 is provided on the top of the socket. A buckle 303 is provided on the periphery of the socket, and a bayonet 401 matching the buckle 303 is provided on the periphery of the sleeve 4. The base 3 and the sleeve 4 are fixed by the buckle 303 and the bayonet 401.

[0070] In some embodiments, as shown in Figure 7, a first through hole is provided on the base 3, a sleeve 402 is provided on the top of the sheath 4, and a puncture channel 403 is built into the sleeve 402. The first through hole and the puncture channel 403 are coaxially arranged. In a preferred embodiment, the height between the puncture needle needle 102 and the blood return groove 101 is less than the height of the sleeve 402, which can ensure that in the activated state, the sleeve 402 completely wraps the puncture needle needle 102 to prevent the needle head 102 from being exposed.

[0071] The present invention also discloses a medical infusion device, comprising the above-mentioned anti-puncture device for the medical puncture device.

[0072] There are many implementation methods of the present invention, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A puncture prevention device for a medical puncture device, comprising a sheath, a puncture needle and a retaining spring, wherein the retaining spring is arranged in the sheath, and the puncture needle is arranged between the retaining spring and the sheath, characterized in that: The sheath comprises a main body and a base arranged at the bottom of the main body, wherein the base is provided with a limited step on a first side; The puncture needle comprises a hollow tube body, a needle head at one end of the tube body, and a blood return groove arranged on the periphery of the tube body; The retainer spring piece comprises a fixing portion, the fixing portion is provided with a bottom hole, a support arm is provided on a first side of the fixing portion, and an elastic arm is provided on a second side, the support arm comprises a first side arm bent upward from one side of the fixing portion and a guide portion bent from the top of the first side arm and parallel to the fixing portion, a strip groove is provided on the support arm, the strip groove connects the first side arm and the guide portion, an open guide hole is further provided on the guide portion, the open guide hole is provided at the end of the strip groove, an end of the open guide hole connected to the strip groove is formed with an opening, and the open guide hole is coaxially arranged with the bottom hole; The width of the tube body of the puncture needle at the blood return groove position is less than the opening width of the open guide hole, less than the outer diameter of the tube body of the puncture needle, less than the width of the strip groove; In the initial state, the first side of the fixing portion is placed flat on the limiting step, the tube body of the puncture needle coaxially passes through the bottom hole and the open guide hole, the blood return groove is located at the top of the open guide hole, and the elastic arm is elastically abutted against the tube body of the puncture needle; In the activated state, the blood return groove on the puncture needle retreats to the height of the open guide hole and moves from the opening of the open guide hole to the strip groove, the retaining frame spring sheet tilts toward the second side and the fixing portion leaves the limiting step surface, the bottom hole tilts with the fixing portion and the hole wall of the bottom hole applies a cross torque to the outer periphery of the tube body of the puncture needle and holds the tube body tightly, the elastic arm is still elastically in contact with the tube body of the puncture needle and the torque at the contact between the two increases as the retaining spring sheet tilts.

2. The puncture prevention device for a medical puncture instrument according to claim 1, characterized in that: The two sides of the opening between the open guide hole and the strip groove are symmetrically arranged arc-shaped transition surfaces.

3. The puncture prevention device for a medical puncture instrument according to claim 1, characterized in that: Two reinforcing arms are arranged at both ends of the fixing part between the supporting arm and the elastic arm, the thickness of the reinforcing arms is greater than the thickness of other positions of the fixing part, each reinforcing arm is arranged with a first side shoulder on the side close to the supporting arm, and each reinforcing arm is arranged with a second side shoulder on the side close to the elastic arm, and the fixing part, the supporting arm, the elastic arm and the reinforcing arm are integrally formed.

4. The puncture prevention device for a medical puncture instrument according to claim 1, characterized in that: The elastic arm is overall "S"-shaped, including a second side arm bent upward from one side of the fixing portion, the top of the second side arm bent toward the second side to form a positioning portion, and in the initial state, the connection between the second side arm and the positioning piece elastically abuts against the outer periphery of the tube body of the puncture needle.

5. The puncture prevention device for a medical puncture instrument according to claim 4, characterized in that: The second side arm includes a first connection portion connected to the positioning portion, and a second connection portion connected to the fixing portion, a neck portion is provided between the first connection portion and the second connection portion, the neck portion gradually narrows from the first connection portion to the second connection portion, the width of the first connection portion is equal to the maximum width of the neck portion, and the width of the second connection portion is equal to the minimum width of the neck portion.

6. The puncture prevention device for medical puncture instruments according to claim 4, characterized in that: The first side arm is inclined toward the second side, the second side arm is inclined toward the first side, and the connection point of the second side arm is located at a plane where the side edge of the first side intersects with the bottom hole.

7. The puncture prevention device for a medical puncture instrument according to claim 3, characterized in that: Two pressure columns are arranged on the second side of the inner wall of the sheath, the distance between the two pressure columns is equal to the distance between the two reinforcing arms, and the two pressure columns are arranged on the top of the second side shoulders of the two reinforcing arms in a one-to-one correspondence.

8. The puncture prevention device for a medical puncture instrument according to claim 1, characterized in that: The base is provided with a clamping seat on both sides of the limiting step, the top of the clamping seat is provided with a limiting groove, the outer periphery of the clamping seat is provided with a buckle, and the outer periphery of the sheath is provided with a bayonet matched with the buckle.

9. The puncture prevention device for a medical puncture instrument according to claim 8, characterized in that: The base is provided with a first through hole, the top of the sheath is provided with a sleeve, the sleeve has a built-in puncture channel, and the first through hole and the puncture channel are coaxially arranged.

10. A medical infusion device, characterized in that: It comprises a puncture prevention device for a medical puncture instrument as described in any one of claims 1 to 9.

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