A safety injection needle

Abstract

A safety injection needle consists of a needle seat, a needle tube and a protective sleeve; the characteristics are that: the protective sleeve is connected to the connecting part by a first thin wall; the fixing plate is connected to the connecting part by a second thin wall; the fixing plate is embedded in the outer surface of the needle seat; the protective sleeve is in a U-shaped groove, and its length is greater than the needle tube; the inner wall of the U-shaped groove is provided with two locking pieces extending downward and to the opposite sides, which can cross each other and the intersection point is located below the center line of the groove; the protective sleeve and the fixing plate initially overlap on the first thin wall, so that the center line of the fixing plate crosses the center line of the protective sleeve groove and moves toward the groove mouth side, so that the needle tube is shielded above the locking piece in the groove but not limited; when in use, the protective sleeve is turned down to expose the needle tube, so that the locking pin at the lower edge of the protective sleeve is engaged with the locking groove; after diagnosis and treatment, the protective sleeve is turned up and overlapped with the fixing plate at the second thin wall, so that the center line of the fixing plate crosses the center line of the protective sleeve groove again and moves to the deep groove, and the distance is twice the spacing between the first and second thin walls of the connecting part; the needle tube is shielded and locked below the locking piece in the deep groove of the protective sleeve.

Description

Technical Field

[0001] The invention relates to a puncture device in a medical device, in particular to a safety injection needle. Background Art

[0002] Chinese patent: CN103432657B discloses "a safe injection needle", which has the following technical features: it includes a needle, a needle cap, a needle seat and a safety needle sheath. The safety needle sheath is provided with a sleeve, and a cylinder and a locking piece for locking the needle on the sleeve; the needle seat is connected to the safety needle sheath through a connecting part; the sleeve is connected to the cylinder by a spring buckle; there is a hook on the sleeve and a corresponding hole on the cylinder.

[0003] Chinese patent: CN 104069568 B discloses: "A safety device capable of locking an injection needle", which is composed of a safety cover and a locking boss, a locking plate, a positioning hole, a positioning hole platform and an injection needle arranged on the safety cover; its technical features are: the used needle tube enters the locking plate through the locking boss and is firmly locked in the safety cover; at least two pieces of the locking plate extend toward the center point; there is a grooved cone on the locking plate boss and a small cylinder with a slightly smaller outer diameter corresponds to it.

[0004] The above invention patents all add a protective cover to the outside of the current injection needle (needle seat, needle tube, sheath). When in use, remove the original sheath to expose the needle tube. After use, cover the needle tube with the protective cover, shield the needle tube with a locking piece or card in the groove, and interlock the hook and the hole or the slotted cylinder and the small cylinder to complete the shielding and locking of the needle tube to prevent it from being reused. According to the technical requirements of injection needles specified by international standards and national standards, the needle seat provides a connection and fixation function between the syringe and the needle tube; the protective cover provides a shielding and protection function for the needle tube, especially the needle tip, mainly to prevent the needle tip (needle tube) from being touched by external hard objects and causing bending or curling of the needle tip. Injection needle products rely on primary packaging to ensure their sterility.

[0005] The above technical solution has shortcomings: a safety sheath that can laterally cover the needle tube is added to the outside of the original sheath of the injection needle, so that the safety sheath is located beside the original sheath (semi-covering) position, which not only increases the volume of the packaging, but also wastes a sheath, increases costs, and increases the operation link (removing the original sheath); this design has been used in Europe for more than ten years, but has not been widely used in domestic clinical practice.

[0006] Therefore, it is necessary to design a safety injection needle that does not require the participation of a syringe, has a simple structure, does not increase the packaging size and minimizes the cost, and has a self-protection function. Summary of the invention

[0007] The purpose of the present invention is to develop a safety injection needle with simple structure, low cost, easy production and conforming to clinical use regulations in view of the shortcomings of many current safety injection needle technologies.

[0008] A safety injection needle consists of a needle seat, a needle tube and a protective sleeve; the protective sleeve is divided into an upper sleeve, a lower fixing plate and a connecting part between the two; the characteristics are: the needle tube is bonded to the inner hole at the front end of the needle seat; the sleeve and the connecting part are connected by a first thin wall; the fixing plate and the connecting part are connected by a second thin wall; the sleeve is in a U-shaped groove, and its length is greater than the length of the needle tube; two locking plates extending downward and toward the opposite side are arranged on the inner wall of the U-shaped groove, the locking plates pass over the center line C of the U-shaped groove downward, but do not contact the inner wall of the opposite side; the locking plates can also cross, and the intersection point is located below the center line C of the U-shaped groove of the sleeve (toward the bottom of the groove).

[0009] There is a rolled side at the lower edge of the sheath, and there are symmetrical downward extending locking hooks on both sides of the rolled side near the edge of the U-shaped groove; there is a circular hole in the middle of the fixed plate, which can form a tight fit with the outer periphery of the upper section of the needle seat; there are symmetrical upper and lower arc-shaped plate edges on both sides of the middle of the fixed plate to form a clamp with the locking hooks; the front sections on both sides of the fixed plate have symmetrical locking plates with chamfered upper edges, which can form a lock with the locking hooks.

[0010] There are two locking grooves formed by parallel protrusions on the bottom surface of the connecting part, which can be engaged and locked with the locking pin protruding downward at the intersection of the rolled side of the lower edge of the sheath and the bottom of the U-shaped groove.

[0011] There is an M-shaped locking groove with a barb at the intersection of the lower edge of the sheath and the U-shaped groove; there is a locking column on the bottom surface of the connecting part; when the sheath is opened and the needle tube is completely exposed, the locking groove can form an interlocking lock with the locking column.

[0012] There is a locking square hole at the intersection of the lower edge of the sheath and the U-shaped groove; there is a base on the bottom surface of the connecting part, and an arrow-shaped pin is arranged on the side of the base near the sheath; when the sheath is opened to completely expose the needle tube, the arrow-shaped pin can be inserted into the locking square hole to form a chimeric lock.

[0013] There is a limit hook at the intersection of the lower edge of the sheath and the U-shaped groove; there is a limit plate on the bottom surface of the connecting part; when the sheath is opened to completely expose the needle tube, the limit hook can form an interlocking closure with the limit plate; the restraint hook under the sheath groove can restrain the restraint plate under the baffle, which is beneficial to the stability of the sheath and easy to operate.

[0014] The bending damping of the first thin wall is smaller than that of the second thin wall; the bending part when the sheath and the fixing plate overlap for the first time is the first thin wall, so that the center line Z of the fixing plate moves over the center line C of the U-shaped groove of the sheath toward the opening direction of the U-shaped groove; the needle tube can be shielded above the locking piece in the U-shaped groove of the sheath but not limited; when in use, the sheath is turned downward to expose the needle tube, and the locking pin at the lower edge of the sheath contacts the baffle of the fixing plate, so that the locking pin at the lower edge of the sheath and the locking groove on the bottom surface of the connecting part are mutually engaged; or the locking groove at the lower edge of the sheath and the connecting part are connected; The locking columns on the bottom surface are interlocked; or the locking square hole on the lower edge of the sheath is interlocked with the arrow-shaped pin on one side of the base on the bottom surface of the connection part; or the limit hook on the lower edge of the sheath is interlocked with the limit plate on the bottom surface of the connection part; the sheath position is maintained to facilitate puncture; after the diagnosis and treatment, the sheath and the connection part are turned upward at the second thin wall to overlap with the fixing plate, so that the center line Z of the fixing plate crosses the center line C of the sheath again and moves toward the bottom of the sheath groove, and the moving distance is twice the distance between the first thin wall and the second thin wall of the connection part; this distance is ≥ the vertical height of the inclined locking piece on the inner wall of the sheath U-shaped groove in the long axis direction, and the needle tube can be put into the deep part of the sheath U-shaped groove and located below the locking piece on the inner wall of the U-shaped groove to be shielded and locked. The needle seat and the protective cover can be integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Illustration: 1-needle holder; 2-needle tube; 3-protective cover;

[0016] 11-inner hole at the upper end of the needle seat; 12-conical hole at the lower end of the needle seat; 21-needle tip;

[0017] 31-fixing plate of the lower section of the protective cover; 311-circular hole on the fixing plate; 312-locking plates with chamfers on both sides of the fixing plate; 313-arc-shaped plate edges on both sides of the middle of the fixing plate; 314-a baffle plate near the second thin wall on one side of the circular hole of the fixing plate; 315-abutment column located on the side of the baffle plate 314 (towards the side of the protective cover 32); 316-a restraining plate located below the baffle plate.

[0018] 32-the protective sleeve at the upper part; 321-the groove formed along the long axis of the U-shaped structure of the sleeve; 322-the outward-turned side of the lower edge of the sleeve; 323-the protruding locking pin located at the intersection of the side of the lower edge of the sleeve and the bottom of the U-shaped groove; 324-the locking hooks extending downward symmetrically on both sides of the side of the lower edge of the sleeve; 325-the locking piece extending downward and to the opposite side on the inner side wall of the U-shaped groove of the sleeve; 326-the locking square hole located at the intersection of the side of the lower edge of the sleeve and the bottom of the U-shaped groove; 327-the M-shaped locking groove with a barb located at the intersection of the side of the lower edge of the sleeve and the bottom of the U-shaped groove; 328-the limiting hook located at the intersection of the side of the lower edge of the sleeve and the bottom of the U-shaped groove; 329-the restraining hook located on the lower edge of the sleeve and on one side of the limiting hook at the bottom of the groove.

[0019] 33-connecting portion of the protective sleeve; 331-a first thin wall connecting the connecting portion and the protective sleeve; 332-a second thin wall connecting the connecting portion and the fixing plate;

[0020] 333 - a locking groove at the bottom of the connecting part; 334 - a locking column at the bottom of the connecting part; 335 - a base at the bottom of the connecting part; 336 - an arrow-shaped latch at the side of the base at the bottom of the connecting part; 337 - a limit plate at the bottom of the connecting part;

[0021] Figure 1 is a schematic diagram of the structural decomposition of a safety syringe of the present invention;

[0022] Figure 2 is a schematic diagram of a sheath structure of a safety injection needle of the present invention;

[0023] FIG3 is a schematic structural diagram of a safety injection needle of the present invention when not in use;

[0024] FIG4 is a schematic diagram of the structure of a safety injection needle of the present invention before use;

[0025] FIG5 is a schematic diagram of the structure of a safety injection needle according to the present invention, in which the needle tube is locked and limited after use;

[0026] FIG6 is a schematic diagram of a sheath structure of a second embodiment of a safety injection needle of the present invention.

[0027] 7 is a schematic structural diagram of a second embodiment of a safety injection needle of the present invention when not in use;

[0028] FIG8 is a schematic structural diagram of a second embodiment of a safety injection needle of the present invention before use;

[0029] 9 is a schematic structural diagram of a second embodiment of a safety injection needle according to the present invention, in which the needle tube is locked and limited after use;

[0030] FIG10 is a schematic diagram of a sheath structure of a third embodiment of a safety injection needle of the present invention.

[0031] FIG11 is a schematic structural diagram of a third embodiment of a safety injection needle of the present invention when not in use;

[0032] 12 is a schematic structural diagram of a third embodiment of a safety injection needle of the present invention before use;

[0033] Attached Fig.13 It is a schematic structural diagram of a third embodiment of a safety injection needle of the present invention, in which the needle tube is locked and limited after use;

[0034] FIG14 is a schematic diagram of a sheath structure of a fourth embodiment of a safety injection needle of the present invention.

[0035] Attached Fig.15It is a schematic structural diagram of a fourth embodiment of a safety injection needle of the present invention when not in use;

[0036] 16 is a schematic structural diagram of a fourth embodiment of a safety injection needle of the present invention before use;

[0037] 17 is a schematic structural diagram of a fourth embodiment of a safety injection needle according to the present invention, in which the needle tube is locked and limited after use;

[0038] 18 is a schematic diagram of the composite structure of the needle seat and the sheath of the fifth embodiment of a safety injection needle of the present invention. Specific embodiments

[0039] The present invention is further described below in conjunction with the accompanying drawings.

[0040] As shown in Figure 1, the present invention consists of a needle seat 1, a needle tube 2, and a protective sleeve 3. When the product is formed, the needle tube 2 is inserted into the inner hole 11 at the upper end of the needle seat 1 and bonded to form an injection needle; the lower end of the needle seat 1 has a standard tapered hole 12 that can be screwed onto the cone head of the syringe; the lower section of the protective sleeve 3, after the fixing plate 31 and the sheath are compositely overlapped, is tightly fitted on the outer side of the needle seat 1 by the circular hole 311 on the fixing plate.

[0041] As shown in FIG2 (FIG2-①), the protective sleeve 3 is divided into a lower section of the fixing plate 31 and an upper section of the protective sleeve 32, which are connected to each other by a connecting portion 33; a circular hole 311 is provided in the middle of the fixing plate 31, which can be tightly fitted with the outer periphery of the middle section of the needle seat 1; a section of arc-shaped plate edge 313 is symmetrically provided in the middle of both sides of the fixing plate; a section of locking plate 312 with a bevel is symmetrically provided on both sides of the outer edge of the fixing plate 31 (opposite to the second thin wall); a baffle 314 with an arc chamfer is provided on the bottom surface of the fixing plate 31 near the second thin wall; the protective sleeve 32 is U-shaped. The protective sleeve 32 has a U-shaped structure and a narrow groove 321 along the long axis, and its length is greater than the length of the injection needle tube 2; a rolled side edge 322 is provided at the lower edge of the sheath 32; a pair of locking hooks 324 are symmetrically provided downwardly on the side edge close to the groove; a protruding locking pin 323 is provided at the junction of the bottom of the U-shaped groove 321 and the side edge 322; and at least two locking pieces 325 extending downwardly and to the opposite sides are provided on the inner side wall of the groove 321.

[0042] The connecting portion 33 and the sleeve 32 are connected by a first thin wall 331; the connecting portion 33 and the fixing plate 31 are connected by a second thin wall 332; the bending damping of the first thin wall 331 is smaller than the bending damping of the second thin wall 332, and the first thin wall bends first under the action of external force; there is a locking groove 333 formed by two protrusions on the bottom surface of the connecting portion 33, which can be interlocked with the protruding locking pin 323 at the intersection of the rolled side of the lower edge of the sleeve and the bottom of the U-shaped groove.

[0043] As shown in Figure 2-②, the sheath 32 is a U-shaped structure with a groove 321 along the long axis direction. On the inner wall of the groove 321, there are at least two locking plates 325 extending downward and toward the opposite side. The locking plates cross the center line C of the U-shaped groove of the sheath downward but do not contact the inner wall on the opposite side; the locking plates can cross each other, and the intersection is located below the center line C of the sheath.

[0044] FIG3 is a schematic diagram of the structure of a safety injection needle of the present invention when not in use. It can be seen from FIG3-① and FIG3-② that: the needle holder 1 is embedded in the circular hole 311 on the fixed plate, the needle tube 2 is bonded to the inner hole of the upper section of the needle holder 1, and the needle tube 21 faces upward; the sheath 32 is bent upward at the first thin wall 331 and overlaps with the fixed plate 31; the locking hooks 324 on both sides of the front end of the flange 322 of the lower edge of the sheath are clamped and fixed with the arc plate edges 313 in the middle section of both sides of the fixed plate 31; the needle tube 2 is hidden (shielded) above the two locking pieces 325 on the inner wall of the U-shaped groove 321 of the sheath and is not locked; the center line Z of the fixed plate, the needle holder and the needle tube crosses the center line C of the sheath groove and moves toward the opening direction of the sheath groove.

[0045] FIG4 is a schematic diagram of the structure of a safety injection needle of the present invention in use; when in use, the sheath 32 must be flipped downward to fully expose the needle tube 2, and at the same time, the protruding locking pin 323 at the junction of the bottom of the U-shaped groove of the sheath and the lower edge flange is abutted against the baffle 314 on the bottom surface of the fixing plate 31; under the action of external force (see partial cross-sectional view BB of FIG4 ), the connecting portion 33 and its first and second thin walls are inevitably moved downward by the external force at the same time, so that the locking groove 333 on the bottom surface of the connecting portion 33 is embedded with the protruding locking pin 323, so that the sheath 32 is completely facing downward, nearly parallel to the opposite direction of the injection needle, and no longer shakes, which is conducive to the puncture operation.

[0046] FIG5 is a schematic diagram of the structure of a safety injection needle of the present invention after use, with the needle tube locked and shielded; as can be seen from the figure, after the puncture (injection) treatment activity is completed, the injection needle tube 2 is pulled out, and then the sheath 32 is flipped from bottom to top to cover the needle tube 2 again; (combined with FIG4), since the locking pin 323 at the lower edge of the sheath 32 and the locking groove 333 on the bottom surface of the connecting portion 33 have been embedded with each other when in use, the first thin wall 331 can no longer be folded. When the sheath 32 is flipped, the folding can only occur and be completed at the second thin wall 332 between the connecting portion 33 and the fixing plate 31 (fixed on the needle seat); since twice the spacing between the first thin wall 331 and the second thin wall 332 of the connecting portion 33 is ≥ the vertical height of the inclined locking piece 325 on the inner wall of the sheath U-shaped groove in the long axis direction; flip it again When the sheath is folded and the sheath 32 overlaps with the fixing plate 31, the center line Z of the fixing plate (including the injection needle and the needle seat) will again cross the center line C of the sheath 32 groove and move toward the bottom of the sheath 32 groove; the offset distance is twice the distance between the first thin wall and the second thin wall of the connecting portion, and this distance is ≥ the vertical height of the locking piece 325 extending downward and inward on the inner wall of the U-shaped groove of the sheath. This distance allows the needle tube 2 to accurately enter the lower part of the locking piece 325 on the inner wall of the U-shaped groove from the initial state and be locked and shielded; at the same time, the locking hooks 324 symmetrical on both sides of the side edge 322 of the lower edge of the sheath are locked and embedded with the locking plates 312 on both sides of the fixing plate 31; so that the sheath cannot be opened again and the needle tube 2 cannot be exposed again, which can reduce the risk of needle stick injury and contamination and prevent reuse.

[0047] Second embodiment

[0048] A protective safety injection needle, comprising a needle seat 1, a needle tube 2, and a protective sleeve 3; as shown in FIG6 , the protective sleeve 3 is divided into a lower section of a fixing plate 31 and an upper section of a protective sleeve 32, which are connected to each other by thin walls on both sides of a connecting portion 33; a circular hole 311 is provided in the middle of the fixing plate 31, which can be closely fitted with the outer periphery of the middle section of the needle seat 1; a section of circular arc-shaped plate edge 313 is symmetrically provided in the middle of both sides of the fixing plate; a section of a locking plate 312 with a bevel is symmetrically provided on the outside of both sides of the fixing plate 31 (on the side opposite to the second thin wall); a chamfered baffle 314 is provided on the bottom surface of the fixing plate 31 near the second thin wall, and a protruding abutting column 315 is provided in the middle of the baffle, which is used to abut the locking column 334; the protective sleeve 32 is U-shaped The U-shaped structure (see FIG. 2-①) has a long and narrow groove 321 along the long axis, and its length is greater than the length of the injection needle tube 2; there is a rolled side edge 322 at the lower edge of the sheath 32; a pair of locking hooks 324 are symmetrically arranged downward on the side close to the groove; and a locking groove 327 with barbs on both sides is provided at the junction of the bottom of the U-shaped groove 321 and the side edge 322.

[0049] The connecting portion 33 and the sleeve 32 are connected by a first thin wall 331; the connecting portion 33 and the fixing plate 31 are connected by a second thin wall 332; the bending damping of the first thin wall 331 is smaller than the bending damping of the second thin wall 332, and the first thin wall bends first under the action of external force; there is a protruding locking column 334 on the bottom surface of the connecting portion 33, which can be interlocked and locked with the locking groove 327 at the intersection of the rolled side of the lower edge of the sleeve and the bottom of the U-shaped groove.

[0050] The sheath 32 has a U-shaped structure and has a groove 321 along the long axis (see Figure 2-②). On the inner wall of the groove 321, there are at least two locking plates 325 extending downward and toward the opposite side. The locking plates cross the center line C of the U-shaped groove of the sheath downward but do not contact the inner wall on the opposite side. The locking plates can cross each other, and the intersection is located below the center line C of the sheath.

[0051] FIG7 is a schematic diagram of the structure of a safety injection needle of the present invention when not in use. It can be seen from FIGS. 7-① and 7-② that the needle holder 1 is embedded in the circular hole 311 on the fixing plate, the needle tube 2 is bonded in the inner hole of the upper section of the needle holder 1, and the needle tube 21 faces upward; the sheath 32 is bent upward at the first thin wall 331 and overlaps the fixing plate 31; the locking hooks 324 on both sides of the front end of the flange 322 of the lower edge of the sheath are clamped and fixed with the arc plate edges 313 in the middle section of both sides of the fixing plate 31; the needle tube 2 is hidden (shielded) above the two locking pieces 325 on the inner wall of the U-shaped groove 321 of the sheath and is not locked; the center line Z of the fixing plate, the needle holder and the needle tube is above the center line C of the sheath groove (near the U-shaped groove mouth).

[0052] FIG8 is a schematic structural diagram of a safety injection needle of the present invention in use; when in use, the sheath 32 must be turned downward at the first thin wall 331 to fully expose the needle tube 2. At the same time, under the resistance of the baffle 314 and the abutment column 315 on the bottom surface of the fixing plate 31, the locking groove 327 at the junction of the bottom of the U-shaped groove of the sheath and the lower edge flange and the locking column 334 on the bottom surface of the connecting portion 33 are embedded and locked, and the sheath 32 is completely facing downward, nearly parallel to the opposite direction of the injection needle, and no longer shakes, which is conducive to the puncture operation.

[0053] FIG9 is a schematic diagram of the structure of a safety injection needle of the present invention after use, with the needle tube locked and shielded; as can be seen from the figure, after the puncture (injection) treatment activity is over, the injection needle tube 2 is pulled out, and then the sheath 32 is flipped from bottom to top to cover the needle tube 2 again; (combined with FIG8), since the locking groove 327 at the lower edge of the sheath 32 and the locking column 334 on the bottom surface of the connecting portion 33 are embedded and locked when in use, the first thin wall 331 can no longer be folded. When the sheath 32 is flipped, only the second thin wall 332 between the connecting portion 33 and the fixing plate 31 (fixed on the needle seat) can be folded and completed. When the sheath 32 overlaps with the fixing plate 31, the fixing plate (including the injection needle, the needle seat) will be folded. ) is displaced toward the valley bottom of the sheath 32 groove and crosses the groove centerline C of the sheath 32; the offset distance is twice the spacing between the first thin wall and the second thin wall of the connecting portion, and this distance is ≥ the vertical height of the locking piece 325 extending downward and inward on the inner wall of the U-shaped groove of the sheath. This distance allows the needle tube 2 to accurately enter the lower part of the locking piece 325 on the inner wall of the U-shaped groove from the initial state and be locked and shielded; at the same time, the locking hooks 324 symmetrical on both sides of the side edges 322 of the lower edge of the sheath are locked and embedded with the locking plates 312 on both sides of the fixing plate 31; so that the sheath cannot be opened again and the needle tube 2 cannot be exposed again, which can reduce the risk of acupuncture injuries and contamination and prevent reuse.

[0054] Third embodiment

[0055] A protective safety injection needle is still composed of a needle seat 1, a needle tube 2, and a protective sleeve 3; as shown in FIG10, the protective sleeve 3 is divided into a lower section of a fixing plate 31 and an upper section of a protective sleeve 32, which are connected to each other by thin walls on both sides of a connecting portion 33; a circular hole 311 is provided in the middle of the fixing plate 31, which can be tightly fitted with the outer periphery of the middle section of the needle seat 1; a section of circular arc-shaped plate edge 313 is symmetrically provided in the middle of both sides of the fixing plate; a section of a locking plate 312 with a bevel is symmetrically provided on the outside of both sides of the fixing plate 31 (on the side opposite to the second thin wall); a baffle plate 314 with a chamfer is provided on the bottom surface of the fixing plate 31 near the second thin wall, and a protruding abutment column 315 is provided in the middle of the baffle plate, which is used to abut against a latch base 335 below the connecting portion; the protective sleeve 32 is U-shaped shaped structure (see FIG. 2-①), a narrow groove 321 along the long axis, the length of which is greater than the length of the injection needle tube 2; a rolled side edge 322 is provided at the lower edge of the sheath 32; a pair of locking hooks 324 are symmetrically provided downwardly on the side edge close to the groove; and a locking square hole 326 is provided at the junction of the bottom of the U-shaped groove 321 and the side edge 322.

[0056] The connecting portion 33 and the sheath 32 are connected by a first thin wall 331; the connecting portion 33 and the fixing plate 31 are connected by a second thin wall 332; the bending damping of the first thin wall 331 is smaller than that of the second thin wall 332, and the first thin wall bends first under the action of external force; there is a raised base 335 on the bottom surface of the connecting portion 33, and there is a pin 336 with barbs on both sides on the side of the base facing the sheath, which can be interlocked and locked with the locking square hole 326 at the intersection of the rolled side of the lower edge of the sheath and the bottom of the U-shaped groove.

[0057] The sheath 32 has a U-shaped structure and has a groove 321 along the long axis (see Figure 2-②). On the inner wall of the groove 321, there are at least two locking plates 325 extending downward and toward the opposite side. The locking plates cross the center line C of the U-shaped groove of the sheath downward but do not contact the inner wall on the opposite side. The locking plates can cross each other, and the intersection is located below the center line C of the sheath.

[0058] FIG11 is a schematic diagram of the structure of a safety injection needle of the present invention when not in use. As shown in FIGS. 11-① and 11-②, the needle holder 1 is embedded in the circular hole 311 on the fixing plate, the needle tube 2 is bonded to the inner hole of the upper section of the needle holder 1, and the needle tube 21 faces upward; the sheath 32 is bent upward at the first thin wall 331 and overlaps the fixing plate 31; the locking hooks 324 on both sides of the front end of the flange 322 of the lower edge of the sheath and the arc plate edges 313 in the middle section of both sides of the fixing plate 31 form a clamping fixation; the needle tube 2 is hidden (shielded) in the U-shaped groove 321 of the sheath, but is located above the two locking pieces 325 on the inner wall of the U-shaped groove; the center line Z of the fixing plate, the needle holder and the needle tube is above the center line C of the sheath groove (near the U-shaped groove mouth).

[0059] FIG12 is a schematic structural diagram of a safety injection needle of the present invention in use; when in use, the sheath 32 must be turned downward at the first thin wall 331 to fully expose the needle tube 2. At the same time, under the resistance of the baffle 314 and the abutment column 315 on the bottom surface of the fixing plate 31, the locking square hole 326 at the junction of the bottom of the U-shaped groove of the sheath and the lower edge flange and the arrowhead pin 336 on the bottom surface of the connecting portion 33 are embedded and locked, so that the sheath 32 is completely facing downward, nearly parallel to the opposite direction of the injection needle, and no longer shakes, which is conducive to the puncture operation.

[0060] Fig.131 is a schematic diagram of the structure of a safety injection needle of the present invention after use, in which the needle tube is locked and shielded; as can be seen from the figure, after the puncture (injection) treatment activity is completed, the injection needle tube 2 is pulled out, and then the sheath 32 is flipped from bottom to top to cover the needle tube 2 again; (combined with FIG. 12), since the locking square hole 326 at the lower edge of the sheath 32 and the arrow pin 336 on the bottom surface of the connecting portion 33 are embedded and locked when in use, the first thin wall 331 cannot be folded again. When the sheath 32 is flipped, the folding can only occur and be completed at the second thin wall 332 between the connecting portion 33 and the fixing plate 31 (fixed on the needle seat); when the sheath is folded again and the sheath 32 overlaps with the fixing plate 31, the fixing plate (including the injection needle and the needle seat) will be The center line Z of the sheath 32 is displaced toward the bottom of the groove of the sheath 32 and passes over the center line C of the groove of the sheath 32; the offset distance is twice the distance between the first thin wall and the second thin wall of the connecting portion, and this distance is ≥ the vertical height of the locking piece 325 extending downward and inward on the inner wall of the U-shaped groove of the sheath. This distance allows the needle tube 2 to accurately enter the lower part (deep in the groove) of the locking piece 325 on the inner wall of the U-shaped groove from the initial unlocked state and be locked and shielded; at the same time, the locking hooks 324 symmetrical on both sides of the side edge 322 of the lower edge of the sheath are locked and embedded with the locking plates 312 on both sides of the fixing plate 31; so that the sheath cannot be opened again and the needle tube 2 cannot be exposed again, which can reduce the risk of acupuncture injuries and contamination and prevent reuse.

[0061] Fourth embodiment

[0062] A protective safety injection needle is still composed of a needle seat 1, a needle tube 2, and a protective sleeve 3; as shown in Figure 14, the protective sleeve 3 of the fourth embodiment is divided into a lower section of a fixing plate 31 and an upper section of a protective sleeve 32, which are connected to each other by thin walls on both sides of a connecting portion 33; a circular hole 311 is provided in the middle of the fixing plate 31, which can be tightly fitted with the outer periphery of the middle section of the needle seat 1; a section of circular arc-shaped plate edge 313 is symmetrically provided in the middle of both sides of the fixing plate; a section of a locking plate 312 with a bevel is symmetrically provided on the outside of both sides of the fixing plate 31 (opposite to the second thin wall); a baffle 314 with a chamfer is provided on the bottom surface of the fixing plate 31 near the second thin wall, and a protruding abutting column 315 is provided in the middle of the baffle, which is used to abut against a limiting plate 337 below the connecting portion 33; the protective sleeve 32 is U-shaped The U-shaped structure (see FIG. 2-①) has a narrow groove 321 along the long axis, and its length is greater than the length of the injection needle tube 2; there is a rolled side edge 322 at the lower edge of the sheath 32; a pair of locking hooks 324 are symmetrically arranged downward on the side close to the groove; there is a limit hook 328 at the junction of the bottom of the U-shaped groove 321 and the side edge 322; there is also a similar restraining hook 329 on one side of the limit hook; when the sheath is turned outward and downward, it can be mutually frictionally engaged with the restraining plate 338 on the fixed plate baffle to facilitate the stability of the sheath;

[0063] The connecting part 33 is connected to the sheath 32 by a first thin wall 331; the connecting part 33 is connected to the fixing plate 31 by a second thin wall 332; the bending damping of the first thin wall 331 is smaller than that of the second thin wall 332, and the first thin wall is bent first under the action of external force; there is a raised stop plate 337 on the bottom surface of the connecting part 33, and the side thereof facing the sheath has an arc chamfer; it can be interlocked with the stop hook 328 at the intersection of the rolled side of the lower edge of the sheath and the bottom of the U-shaped groove. There is a restraining plate 316 below the baffle 314 on one side of the bottom surface of the fixing plate, and one side of it has a chamfer.

[0064] The sheath 32 has a U-shaped structure and has a groove 321 along the long axis (see Figure 2-①). On the inner wall of the groove 321, there are at least two locking plates 325 extending downward and toward the opposite side. The locking plates cross the center line C of the U-shaped groove of the sheath downward but do not contact the inner wall on the opposite side. The locking plates can cross each other, and the intersection is located below the center line C of the sheath.

[0065] Fig.15 is a schematic structural diagram of a safety injection needle of the present invention when not in use, comprising Fig.15 -①, 15-② It can be seen that: the needle seat 1 is embedded in the circular hole 311 on the fixed plate, the needle tube 2 is glued in the inner hole of the upper section of the needle seat 1, and the needle tube 21 is facing upward; the sheath 32 is bent upward at the first thin wall 331 and overlaps with the fixed plate 31; the locking hooks 324 on both sides of the front end of the flange 322 of the lower edge of the sheath and the arc plate edges 313 in the middle section of both sides of the fixed plate 31 form a clamping fixation; the needle tube 2 is hidden (shielded) in the U-shaped groove 321 of the sheath, but is located above the two locking plates 325 on the inner wall of the U-shaped groove; the center line Z of the fixed plate, the needle seat and the needle tube is above the center line C of the sheath groove (near the U-shaped groove mouth).

[0066] 16 is a schematic structural diagram of a safety injection needle in use according to the present invention; when in use, the sheath 32 must be flipped downward at the first thin wall 331 to fully expose the needle tube 2. At the same time, under the resistance of the baffle 314 and the abutment column 315 on the bottom of the fixing plate 31, the limiting hook 328 at the junction of the bottom of the U-shaped groove of the sheath and the lower edge flange is embedded and locked with the limiting plate 337 on the bottom of the connecting portion 33; the restraining hook 329 at the lower end of the sheath 32 and the restraining plate 316 below the baffle 314 form mutual restraints, so that the sheath 32 is completely downward, almost parallel to the opposite direction of the injection needle, and no longer shakes, which is conducive to the puncture operation.

[0067] FIG17 is a schematic diagram of the structure of a safety injection needle of the present invention after use, with the needle tube locked and shielded; as can be seen from the figure, after the puncture (injection) treatment activity is completed, the injection needle tube 2 is pulled out, and then the sheath 32 is flipped from bottom to top, the constraint of the constraint hook 329 on the constraint plate 316 is released, so that the sheath 32 covers the needle tube 2 again; (combined with FIG12), since the limit hook 328 at the lower edge of the sheath 32 and the limit plate 337 on the bottom surface of the connecting portion 33 are embedded and locked when in use, the first thin wall 331 can no longer be folded. When the sheath 32 is flipped over, the folding can only occur and be completed at the second thin wall 332 between the connecting portion 33 and the fixing plate 31 (fixed on the needle seat); since the distance between the first thin wall 331 and the second thin wall 332 of the connecting portion 33 is ≥ 2 times the inclined lock on the inner wall of the U-shaped groove in the long axis direction of the sheath The vertical height of the piece 325; when the sheath is folded again and the sheath 32 overlaps with the fixed plate 31, the center line Z of the fixed plate (including the injection needle and the needle seat) will be displaced toward the bottom of the sheath 32 groove and cross the center line C of the groove of the sheath 32; the offset distance is twice the distance between the first thin wall and the second thin wall of the connecting portion, and this distance is ≥ the vertical height of the locking piece 325 extending downward and inward on the inner wall of the U-shaped groove of the sheath. This distance allows the needle tube 2 to accurately enter the lower part of the locking piece 325 on the inner wall of the U-shaped groove from the initial state and be locked and shielded; at the same time, the locking hooks 324 symmetrical on both sides of the side edge 322 of the lower edge of the sheath are locked and embedded with the locking plates 312 on both sides of the fixed plate 31; so that the sheath cannot be opened again, and the needle tube 2 cannot be exposed again, which can reduce the risk of needle stick injury and contamination and prevent reuse.

[0068] Fifth embodiment

[0069] Fig. 18 is a schematic diagram of the needle seat and sheath structure of a safety injection needle of the present invention. As can be seen from the figure, the needle seat 1 can be an integral structure with the protective sheath 3; during production, the needle tube is inserted into the upper hole of the needle seat and bonded to form an injection needle; the sheath is bent at the first thin wall and overlapped with the fixing plate, so that the needle tube can be hidden in the U-shaped groove of the sheath, but above the locking piece 325 on the inner wall of the U-shaped groove; the rest of the structural changes during use and its safety protection process are the same as those of the first embodiment.

[0070] The main feature of the present invention is that when the protective cover is not in use and after use, and in the process of covering the protective cover, the protective cover of the upper section, the fixing plate of the lower section and the first thin wall and the second thin wall structure of the connecting part are scientifically utilized, so that the protective cover is folded at the first thin wall in the initial state (when not in use), and the center line C of the protective cover groove is displaced relative to the center line Z of the circular hole (needle seat, needle tube) of the fixing plate and is located in the groove above the center line of the protective cover groove, which can shield the needle tube but cannot limit and lock the needle tube; after opening the protective cover to expose the needle tube, and completing the puncture diagnosis and treatment activities, the locking groove on the bottom surface of the connecting part and the protruding lock on the lower edge of the protective cover are used to lock the protective cover. The mutual engagement of the fixed pins allows the connection part to be bent from the second thin wall when the sheath is re-sheathed, so that the center line Z of the circular hole of the fixing plate again crosses the center line C of the sheath groove and moves toward the valley bottom of the sheath groove, limiting the needle tube shielding below the locking piece of the U-shaped groove of the sheath, and cannot be exposed again and cannot be reused; the risks of needle stick injuries and contamination can be eliminated; by folding the first and second thin walls of the protective sheath connection part in sequence, the displacement distance of the center line C of the sheath groove relative to the center line Z of the circular hole of the fixing plate can be twice the width of the connection part; the width of the connection part can be reasonably designed to control the distance of the sheath displacement to the left and right.

[0071] Compared with previous technical solutions, the present invention meets the requirements of laws and regulations and international product standards, has a simple structure, is safe and reliable, has low cost, can realize automated assembly and production, reduces clinical operation actions, and is conducive to popular clinical use.

[0072] The technical feature of the present invention is that the sheath can be displaced left and right relative to the fixing plate including the needle seat and the needle tube midline before and after use (opening the sheath and re-covering the sheath), and the technical solution adopted is to selectively use different bending points (first thin wall and second thin wall) of the connecting part when opening and re-covering the sheath. Any technical variation involving this will fall within the scope of the technical solution of the present invention patent.

Claims

1. A safety injection needle comprises a needle holder (1), a needle tube (2), and a protective sleeve (3); the protective sleeve is divided into an upper sleeve (32), a lower fixing plate (31), and a connecting portion (33) therebetween; Features: The needle tube (2) is bonded to the inner hole (11) at the front end of the needle seat (1); the sheath (32) and the connecting part (33) are connected by a first thin wall (331); the fixing plate (31) and the connecting part (33) are connected by a second thin wall (332); the sheath (32) is in the form of a U-shaped groove (321) whose length is greater than the length of the needle tube (2); two locking plates (325) extending downward and toward opposite sides are provided on the inner wall of the U-shaped groove (321), the locking plates pass downward over the center line C of the U-shaped groove (321), but do not contact the inner wall on the opposite side; the locking plates may also cross, and the intersection point is located below the center line C of the sheath U-shaped groove (toward the bottom of the groove); A rolled side edge (322) is provided at the lower edge of the sheath (32), and symmetrical locking hooks (324) extending downward are provided on both sides of the rolled side edge near the edge of the U-shaped groove; a circular hole (311) is provided in the middle of the fixing plate (31), and the hole can be tightly fitted with the outer periphery of the upper section of the needle seat; a section of plate edges (313) in the shape of upper and lower arcs are symmetrically provided on both sides of the middle of the fixing plate (31) to form a clamp with the locking hook (324); symmetrical locking plates (312) with chamfered upper edges are provided on the front sections of both sides of the fixing plate (31) to form a lock with the locking hook (324); The bending damping of the first thin wall (331) is smaller than the bending damping of the second thin wall (332); the bending part when the sheath (32) and the fixing plate (31) overlap for the first time is the first thin wall (331), so that the center line Z of the fixing plate (31) moves over the center line C of the U-shaped groove (321) of the sheath and moves toward the groove opening direction; the needle tube (2) is located above the locking piece (325) in the U-shaped groove (321) of the sheath (32) and is shielded but not limited; when in use, the sheath (32) is turned downward to expose the needle tube (2), and the locking pin (323) at the lower edge of the sheath (32) contacts the baffle (314) of the fixing plate (31), so that the locking pin (323) at the lower edge of the sheath (32) and the locking groove (333) at the bottom surface of the connecting portion (33) are mutually engaged; Alternatively, the locking groove (327) at the lower edge of the sheath (32) is engaged with the locking column (334) at the bottom surface of the connecting portion (33); Alternatively, the locking square hole (326) at the lower edge of the sheath (32) is engaged with the arrow-shaped latch (336) at one side of the base at the bottom surface of the connecting portion; Alternatively, the limiting hook (328) at the lower edge of the sheath (32) is engaged with the limiting plate (337) at the bottom surface of the connecting portion (33); The position of the sheath can be maintained and puncture can be facilitated; After the diagnosis and treatment is completed, the sheath (32) and the connecting portion (33) are turned upward at the second thin wall to overlap with the fixing plate (31), so that the center line Z of the fixing plate (31) again crosses the center line C of the sheath (32) and moves deep into the U-shaped groove of the sheath, and the moving distance is twice the distance between the first thin wall (331) and the second thin wall (332) of the connecting portion (33); This distance is ≥ 2U of the sheath The vertical height of the inclined locking piece (325) on the inner wall of the long axis direction of the U-shaped groove can be used to store the needle tube (2) deep in the U-shaped groove (321) of the sheath and below the locking piece (325) on the inner wall of the U-shaped groove (321) to be shielded and locked in position; The needle seat (1) and the protective sleeve (3) may be integrated.

2. A safety injection needle according to claim 1, Features: The bottom surface of the connecting portion (33) is provided with two locking grooves (333) formed by parallel protrusions, which can be engaged and locked with a locking pin (323) protruding downward at the intersection of the rolled side edge (322) of the lower edge of the sheath (32) and the bottom of the U-shaped groove (321).

3. A safety injection needle according to claim 2, Features: An M-shaped locking groove (327) with a barb is provided at the intersection of the lower edge of the sheath (32) and the U-shaped groove; a locking column (334) is provided on the bottom surface of the connecting portion (33); when the sheath (32) is opened to completely expose the needle tube, the locking groove (327) can be engaged and locked with the locking column (334).

4. A safety injection needle according to claim 2, Features: A locking square hole (326) is provided at the intersection of the lower edge of the sheath (32) and the U-shaped groove; a base (335) is provided on the bottom surface of the connecting portion (33), and an arrow-shaped latch (336) is provided on a side surface of the base near the sheath; when the sheath (32) is opened to completely expose the needle tube, the arrow-shaped latch (336) can be inserted into the locking square hole (326) to form a chimeric lock.

5. A safety injection needle according to claim 2, Features: A limiting hook (328) is provided at the intersection of the lower edge of the sheath (32) and the U-shaped groove; a limiting plate (337) is provided on the bottom surface of the connecting portion (33); when the sheath (32) is opened to completely expose the needle tube, the limiting hook (328) can form an interlocking lock with the limiting plate (337); a restraining plate (316) is provided below the baffle plate, and a restraining hook (329) is provided on one side of the limiting hook (328) at the lower edge of the sheath (32), and the restraining hook (329) can form a mutual restraint with the restraining plate (316).

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