A safety injection needle

Abstract

A safety injection needle consists of a needle seat, a needle tube and a sheath; the characteristics are that the needle tube is bonded to the needle hole at the front end of the needle seat; the lower section of the sheath is embedded in the outer surface of the needle seat; the inner wall of the U-shaped groove of the upper section of the sheath is provided with two locking pieces extending downward and to the opposite sides and can cross each other, and the intersection point is located below the center line of the upper section of the sheath; the upper section of the sheath and the lower section of the sheath are initially folded at the overlapping second thin wall so that the center line of the upper section of the sheath is displaced toward the direction of the connecting part relative to the center line of the lower section of the sheath, so that the needle tube is located above the locking piece in the sheath groove and is shielded but not limited; when in use, the sheath is turned down to expose the needle tube and the locking pin of the upper section of the sheath is engaged with the locking groove of the connecting part; after use, the upper section of the sheath (including the connecting part) is turned up at the first thin wall to overlap with the lower section of the sheath so that the center line of the upper section of the sheath is displaced in the opposite direction of the connecting part relative to the center line of the lower section of the sheath, and the distance is twice the spacing between the thin walls on both sides of the connecting part; the needle tube can be put into the deep groove of the upper section of the sheath and is located below the locking piece to be shielded and locked.

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] After the first case of AIDS was discovered in the United States in the 1980s, the World Health Organization proposed three principles for safe injections, requiring the research and use of safe injection needles. However, for technical reasons, the international community mostly made self-destructive syringes by limiting the outer barrel and the push rod of the syringe, or puncturing the piston, or breaking the push rod, etc., to limit the reuse of syringes; but because the needle tip is still exposed, needle injuries cannot be avoided, and blood-borne diseases (AIDS, hepatitis B, hepatitis C, etc.) are still infected and spread; entering the 21st century, governments and the international community have more urgent requirements for safe injection needles; the international community has seen a variety of technical solutions for safe syringes, most of which use manual hand pull or mechanical (compressed spring) force to retract the injection needle into the outer barrel or shield the inner cavity of the push rod, and the injection needle is destroyed and cannot be reused. However, the cost is several times higher than that of ordinary syringes, which affects the popularization of safe syringes and limits their scope of application; in addition, because the technical solution of using syringes to protect injection needles causes a large number of risk-free syringes to be destroyed, resulting in serious waste of resources.

[0003] 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.

[0004] Chinese patent: CN 104069568 B published: "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 needle tip after use enters the locking plate through the locking boss and is firmly locked in the safety cover. The injection needle is composed of a needle seat, a needle tube and a sheath; at least two locking plates extend toward the center point; the grooved cone on the locking plate boss corresponds to a small cylinder with a slightly smaller outer diameter.

[0005] 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, the original sheath is removed to expose the needle tip. After use, the safety needle cover is covered with the needle tip, and the needle tip is blocked with a locking piece (Chen Wei) or a card, and the hook and the hole or the slotted cylinder and the small cylinder are interlocked to complete the shielding and locking of the needle tip to prevent it from being reused.

[0006] The above technical solution has shortcomings: a safety sheath that can laterally cover the needle tip 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 solution has been used in Europe for more than ten years, but has not been used in clinical applications abroad.

[0007] 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

[0008] 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.

[0009] A safety injection needle consists of a needle seat, a needle tube and a sheath; the characteristics are: the needle tube is bonded to the needle hole at the front end of the needle seat; the upper section of the sheath is connected to the connecting part by a first thin wall; the lower section of the sheath is connected to the connecting part by a second thin wall; the lower section of the sheath is embedded in the outer surface of the needle seat; the upper section of the sheath is in the form of a U-shaped groove, the length of which is greater than the length of the needle tube; the inner wall of the U-shaped groove is provided with two locking plates extending downward and to the opposite sides; there is a protruding locking pin at the intersection of the rolled side at the lower edge of the upper section of the sheath and the bottom of the U-shaped groove; and there is a locking groove at the bottom surface of the connecting part.

[0010] There is a rolled side at the lower edge of the upper section 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 lower section of the sheath, which can form a tight fit with the outer periphery of the upper section of the needle seat; the front sections on both sides of the fixing plate of the lower section of the sheath are provided with symmetrical locking plates with chamfered upper edges, which can form a lock with the locking hooks; the upper and lower sides of the middle sections on both sides of the fixing plate of the lower section of the sheath are arc-shaped clamping plate edges, which can form a clamping with the locking hooks; on the inner wall of the U-shaped groove, there are at least two locking plates extending downward and to the opposite side, and the locking plates cross the center line of the U-shaped groove downward, but do not touch the inner wall of the opposite side; the two locking plates can cross each other, and the intersection point is located below the center line of the upper section of the sheath.

[0011] The bottom surface of the connecting portion is provided with locking grooves formed by two parallel protrusions, which can be engaged with the protruding locking pin at the intersection of the rolled side edge of the lower edge of the upper section of the sheath and the bottom of the U-shaped groove.

[0012] There is a first thin wall between the upper section of the sheath and the connecting part, and there is a second thin wall between the lower section of the sheath and the connecting part; the bending damping of the first thin wall is smaller than the bending damping of the second thin wall, so that under the action of external force, the first thin wall is bent first; when the upper section and the lower section of the sheath overlap when not in use, the bending part is the first thin wall, so that the center line C of the upper section of the sheath moves toward the connecting part relative to the center line Z of the lower section of the sheath; the needle tube can be placed in the upper section U of the sheath The upper section of the sheath is shielded in the U-shaped groove, but is not limited above the locking piece in the groove; when in use, the upper section of the sheath is turned downward by 180° to expose the needle tube, because the protruding locking pin at the lower edge of the upper section of the sheath and the locking groove on the bottom surface of the connecting part are engaged with each other to maintain the position of the sheath and facilitate puncture; after the diagnosis and treatment, the upper section of the sheath and the connecting part are turned 180° at the second thin wall to overlap with the lower section of the sheath, so that the center line C of the upper section of the sheath moves in the opposite direction of the connecting part relative to the center line Z of the lower section of the sheath, and the moving distance is twice the distance between the first thin wall and the second thin wall of the connecting part; this distance is ≥ the vertical height of the inclined locking piece of the inner wall of the U-shaped groove in the long axis direction of the upper section of the sheath, so that the injection needle tube can be put into the deep U-shaped groove of the upper section of the sheath, and is located below the locking piece on the inner wall of the U-shaped groove to be shielded and locked.

[0013] Since the present invention adopts a single sheath instead of ordinary sheaths, the number of parts is reduced, the product packaging volume is reduced, the production and assembly process is reduced, the cost is reduced, and the production is easy. At the same time, since the present invention meets the clinical use specifications during use, the sheath is opened once to expose the needle tip, and after use, the sheath is turned over again to cover the needle tip, shielding and limiting the needle tip so that it cannot be exposed again. The present invention is easy to produce and conducive to clinical promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Illustration: 1-needle seat; 2-needle tube; 3-sheath; 31-lower section of sheath; 32 upper section of sheath; 33-sheath connecting part;

[0015] 11-needle hole at the upper end of the needle seat; 12-cone hole at the lower part of the needle seat; 21-needle tip;

[0016] 311 - inner hole of the lower section of the sheath; 312 - chamfered locking plates on both sides of the fixing plate of the lower section of the sheath; 313 - arc-shaped clamping plate edges on both sides of the middle of the fixing plate of the lower section of the sheath; 314 - baffle plate near the first thin wall on one side of the circular hole of the lower section of the sheath;

[0017] 321-groove formed along the long axis of the U-shaped structure of the upper section of the sheath; 322-outward-turned side edge of the lower edge of the upper section of the sheath; 323-protruding locking pin located at the intersection of the side edge of the lower edge of the upper section of the sheath and the bottom of the U-shaped groove; 324-locking hooks extending downward symmetrically on both sides of the side edge of the lower edge of the upper section of the sheath; 325-locking piece extending downward and to the opposite side on the inner side wall of the U-shaped groove of the upper section of the sheath;

[0018] 331 - a first thin wall between the connector and the upper section of the sheath; 332 - a second thin wall between the connector and the lower section of the sheath;

[0019] 333-Locking groove at the bottom of the connecting part.

[0020] Attached Figure 1 It is a schematic diagram of the structural decomposition of a safety syringe of the present invention;

[0021] Attached Figure 2 It is a schematic diagram of a sheath structure of a safety injection needle of the present invention;

[0022] Attached Figure 3 It is a schematic structural diagram of a safety injection needle of the present invention when it is not used after leaving the factory;

[0023] Attached Figure 4 This is a schematic diagram of the structure of a safety injection needle before use of the present invention;

[0024] Attached Figure 5 It is a schematic structural diagram of a safety injection needle of the present invention, in which the needle tip is locked and limited after use;

[0025] Attached Figure 6 It is a schematic diagram of the composite structure of a needle seat and a sheath of a second embodiment of a safety injection needle of the present invention. Specific embodiments

[0026] The present invention is further described below in conjunction with the accompanying drawings.

[0027] Figure 1 As shown, the present invention is composed of a needle seat 1, a needle tube 2, and a sheath 3; the needle tube 2 is inserted into the needle 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 which can be screwed onto the cone head of the syringe.

[0028] Figure 2 As shown, the sheath 3 is divided into a lower section 31 and an upper section 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 of the lower section 31 of the sheath, which can be tightly fitted with the outer periphery of the middle section of the needle seat 1; a chamfered baffle 314 is provided on the bottom surface of the fixing plate of the lower section 31 of the sheath near the first thin wall; the upper section 32 of the sheath is U-shaped, and a narrow groove 321 is provided along one side of the long axis, and its length is greater than the length of the injection needle tube 2 (see attached Figure 1 ); There is a rolled side edge 322 at the lower edge of the upper section 32 of the sheath; a pair of locking hooks 324 are symmetrically arranged downward on the side edge close to the groove; and there is a protruding locking pin 323 at the junction of the bottom of the U-shaped groove 321 and the side edge 322.

[0029] The connecting portion 33 is connected to the upper section 32 of the sleeve by a first thin wall 331; the connecting portion 33 is connected to the lower section 31 of the sleeve 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; a locking groove 333 formed by two parallel protrusions is provided 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 upper section of the sleeve and the bottom of the U-shaped groove.

[0030] Figure 3 This is a schematic diagram of the structure of a safety injection needle in the factory state and not in use. Figure 3 -①, 3-②, as shown in the figure: the needle seat 1 is embedded in the hole 311 of the lower section of the sheath, the needle tube 2 is bonded in the needle hole of the upper section of the needle seat 1, and the needle tip 21 faces upward; the upper section 32 of the sheath is bent upward at the first thin wall 331 and overlaps with the lower section 31 of the sheath; the upper section of the sheath is U-shaped, and has a groove 321 along the long axis direction. On the inner side wall of the groove 321, there are at least two locking pieces 325 extending downward and to the opposite side (see attached Figure 3 ), the locking piece goes down over the center line of the U-shaped groove, but does not touch the inner wall on the opposite side; the locking pieces can cross each other, and the intersection is located below the center line of the upper section of the sheath. The locking hooks 324 on both sides of the front end of the lower edge flange 322 of the upper section of the sheath and the arc-shaped clamping plate edges 313 on both sides of the fixing plate of the lower section 31 of the sheath form a clamping fixation; the needle tube 2 is hidden (shielded) in the U-shaped groove 321 of the upper section of the sheath, but is located above the two inclined locking pieces 325 on the inner wall of the U-shaped groove; the fundamental reason is that the center line C of the upper section of the sheath 32 is displaced relative to the center line Z of the lower section of the sheath (including the needle seat and the needle tube) toward the connecting part 31, so that the puncture needle tube is shielded in the sheath. But it is also located above the locking piece in the U-shaped groove of the sheath and is not limited.

[0031] Figure 4 1 is a schematic diagram of the structure of a safety injection needle in the present invention in use; as can be seen from the figure, when in use, the upper section 32 of the sheath must be turned 180° downward to expose the needle tip 2, and at the same time, the protruding locking pin 323 at the junction of the bottom of the U-shaped groove of the upper section of the sheath and the lower edge flange contacts the limit baffle 314 on the bottom surface of the lower section 31 of the sheath; under the action of external force (see Figure 4 Partial cross-sectional view BB) The connecting portion 33 and its two thin-walled portions 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 and the protruding locking pin 323 are embedded, so that the upper section 32 of the sheath is completely facing downward, almost parallel to the opposite direction of the injection needle, and no longer shakes, which is conducive to the puncture operation.

[0032] Figure 5It is a schematic diagram of the structure of a safety injection needle of the present invention, in which the needle tip is locked and shielded after use; 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 upper section 32 of the sheath is turned 180° from bottom to top to cover the injection needle tube 2 again; (combined with Figure 4 ), since the protruding locking pin 323 at the lower edge of the upper sheath section 32 and the locking groove 333 on the bottom surface of the fixing plate of the connecting portion 33 have been embedded with each other in the use state, the first thin wall 331 can no longer be folded. When the upper sheath section 32 is turned over, only the second thin wall 332 between the connecting portion 33 and the lower sheath section 31 (fixed on the needle seat) can occur and complete a 180° fold; since twice the distance 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 long axis direction of the U-shaped groove of the upper sheath section; after the injection needle puncture diagnosis and treatment activity is completed, the upper sheath section is folded again. When the upper sheath section 32 overlaps with the lower sheath section 31, the center line C of the upper sheath section is relative to The midline Z of the lower section of the sheath (including the injection needle and the needle seat) is offset in the opposite direction of the connecting part, and the offset distance is 2 times the distance between the first thin wall and the second thin wall of the above-mentioned connecting part, and this distance is ≥ the vertical height of the inclined locking piece 325 extending downward and inward on the inner wall of the U-shaped groove in the long axis direction of the upper section of the sheath. This distance is sufficient to allow the needle tube 2 to accurately enter the lower part of the inclined 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 symmetrically located on the side edges 322 of the roll-up on both sides of the lower edge of the upper section of the sheath are embedded with the locking plates 312 with beveled edges on both sides of the fixing plate of the lower section of the sheath 31, so that the needle tip 2 cannot be exposed again, which can reduce the risk of needle stick injury and contamination and prevent reuse.

[0033] Second embodiment

[0034] Figure 6 This 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 and the sheath 3 are an integral structure; during production, the needle tube is inserted into the upper end hole of the needle seat and bonded to form an injection needle; the upper section of the sheath is then bent at the second thin wall to overlap with the lower section of the sheath, so that the needle tube can be hidden in the U-shaped groove of the upper section of the sheath, but on the inclined locking piece 325 on the inner wall of the U-shaped groove; the rest of the structural changes during use and the safety protection process are the same as those of the first embodiment.

[0035] The main feature of the present invention is that when the sheath leaves the factory and after use and in the process of covering the sheath, the structure of the first thin wall and the second thin wall between the upper and lower sections of the sheath and the connecting part is scientifically utilized, so that the upper section of the sheath is displaced relative to the lower section of the sheath during initial production to shield the needle tube but not limit the needle tube; and after completing the puncture diagnosis and treatment activities (use), the locking groove at the bottom of the connecting part and the protruding locking pin at the lower edge of the upper section of the sheath are mutually engaged, so that when the sheath is covered, the connecting part is bent at the first thin wall, so that the relative position of the center line of the upper section of the sheath and the center line of the lower section of the sheath are displaced again; thereby, the needle tube is shielded and limited to below the locking piece of the U-shaped groove of the upper section of the sheath, and it cannot be exposed again and cannot be reused; the risk of needle stick injury and contamination can be eliminated.

[0036] Compared with previous technical solutions, the present invention has a simple structure, is safe and reliable, and has low cost, and can realize automated production and assembly, which is conducive to popular clinical use.

[0037] The technical feature of the present invention is that the upper section of the sheath can be displaced relative to the lower section of the sheath including the needle seat before and after use (opening the sheath and re-covering the sheath), and the technical solution adopted is to select different bending points (first thin wall and second thin wall) of the connecting part when opening and re-covering the upper section of 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 sheath (3); Features: The needle tube (2) is bonded to the needle hole (11) at the front end of the needle seat (1); the upper section (32) of the sheath is connected to the connecting portion (33) by a first thin wall (331); the lower section (31) of the sheath is connected to the connecting portion (33) by a second thin wall (332); the fixing plate of the lower section (31) of the sheath has a circular hole (311) which can be embedded in the outer surface of the needle seat (1); a limiting baffle (314) is provided on one side of the circular hole (311) of the lower section of the sheath close to the first thin wall (332); two thin walls (332); the upper section (32) of the sheath is in the form of a U-shaped groove (321) whose length is greater than the length of the needle tube (2); the inner wall of the U-shaped groove (321) is provided with two locking pieces (325) extending downward and to opposite sides; a protruding locking pin (323) is provided at the intersection of the rolled side edge (322) at the lower edge of the upper section (32) of the sheath and the bottom of the U-shaped groove (321); a locking groove (333) is provided on the bottom surface of the connecting portion (33); There is a rolled side edge (322) at the lower edge of the upper section (32) of the sheath, 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 lower section of the sheath, which can be tightly fitted with the outer periphery of the upper section of the needle seat; the front sections on both sides of the fixing plate of the lower section (31) of the sheath have symmetrical locking plates (312) with chamfered upper edges, which can be locked with the locking hooks (324); the clamping plate edges (313) in the middle sections of both sides of the fixing plate of the lower section (31) of the sheath can be clamped with the locking hooks (324); at least two locking plates (325) extending downward and to the opposite side are provided on the inner side wall of the U-shaped groove (321), and the locking plates cross the center line of the U-shaped groove (321) downward but do not contact the inner wall of the opposite side; the two locking plates (325) can cross each other, and the intersection point is located below the center line of the upper section of the sheath; A first thin wall (331) is provided between the upper section (32) of the sheath and the connecting portion (33), and a second thin wall (332) is provided between the lower section (31) of the sheath and the connecting portion (33); the bending damping of the first thin wall (331) is smaller than the bending damping of the second thin wall (332), so that under the action of an external force, the first thin wall is bent first; The bending part when the upper section (32) of the sheath and the lower section (31) of the sheath are overlapped for the first time is the first thin wall (331), so that the center line C of the upper section (32) of the sheath moves relative to the center line Z of the lower section (31) toward the connecting part (33); the needle tube (2) is shielded in the U-shaped groove (321) of the upper section (32) of the sheath, but is not restricted above the locking piece (325) in the groove; when in use, the upper section (32) of the sheath is turned downward by 180 degrees to expose the needle tube (2), and the locking pin (323) at the lower edge of the upper section (32) abuts against the baffle (314) of the lower section (31) of the sheath, so that the protruding locking pin (323) at the lower edge of the upper section (32) of the sheath and the locking groove (335) on the bottom surface of the connecting part (33) are locked. 3) they fit together to maintain the position of the sheath and facilitate puncture; after the diagnosis and treatment, the upper section (32) of the sheath and the connecting part (33) are turned 180 degrees at the second thin wall to overlap with the lower section (31) of the sheath, so that the center line C of the upper section (32) moves in the opposite direction of the connecting part (33) relative to the center line Z of the lower section (31), and the moving distance is twice the distance between the first thin wall (331) and the second thin wall (332) of the connecting part (33); this distance is ≥ the vertical height of the inclined locking piece (325) on the inner wall of the U-shaped groove of the upper section of the sheath in the long axis direction, so that the injection needle tube (2) can be put into the deep of the U-shaped groove (321) of the upper section of the sheath and is located below the locking piece (325) on the inner wall of the U-shaped groove (321) to be shielded and locked.

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 with the protruding locking pin (323) at the intersection of the rolled side edge (322) of the lower edge of the upper section of the sheath (32) and the bottom of the U-shaped groove (321).

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