CN115054781A - Connecting structure of safety needle shield and needle seat - Google Patents
Connecting structure of safety needle shield and needle seat Download PDFInfo
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- CN115054781A CN115054781A CN202210581610.XA CN202210581610A CN115054781A CN 115054781 A CN115054781 A CN 115054781A CN 202210581610 A CN202210581610 A CN 202210581610A CN 115054781 A CN115054781 A CN 115054781A
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- 238000013016 damping Methods 0.000 claims abstract description 17
- 230000005489 elastic deformation Effects 0.000 claims description 49
- 230000002441 reversible effect Effects 0.000 claims description 35
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 208000001848 dysentery Diseases 0.000 claims description 4
- 230000002829 reductive effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 description 20
- 239000007924 injection Substances 0.000 description 20
- 230000009191 jumping Effects 0.000 description 3
- 206010033425 Pain in extremity Diseases 0.000 description 2
- 241001442654 Percnon planissimum Species 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3275—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel being connected to the needle hub or syringe by radially deflectable members, e.g. longitudinal slats, cords or bands
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3216—Caps placed transversally onto the needle, e.g. pivotally attached to the needle base
- A61M2005/3217—Means to impede repositioning of protection cap from needle covering to needle uncovering position, e.g. catch mechanisms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
- A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hematology (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Environmental & Geological Engineering (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
A connection structure of a safety needle shield and a needle seat comprises a shaft collar (10), the needle seat (60) comprises a base (20) which comprises an elastic back-off part (30) and a rotary adjusting part (40), and the elastic back-off part (30) comprises a plurality of spaced back-off elastic sheets (31) and a containing groove (32); the rotation adjusting part (40) comprises an outer ring concave-convex part (41) and an inner ring concave-convex part (42), and the inner ring concave-convex part (42) is meshed with the outer ring concave-convex part (41) to form a friction damping structure; the elastic reverse-buckling part (30) and the rotary adjusting part (40) are sequentially arranged from the near end to the far end along the axial direction. According to the connecting structure of the safety needle shield and the needle base, the rotating torque M of the shaft ring relative to the needle base is controllable and adjustable, and meanwhile, crisp 'snap' is generated during rotation.
Description
Technical Field
The invention relates to the field of safe injection needles, in particular to a connecting structure of a safe needle shield and a needle seat and an installation method thereof.
Background
The safety syringe must have the protective action of the safety needle shield in the structure: after the injection is completed, the relevant parts on it are displaced to protect the needle tip after use: such as rotation of the safety needle shield. The safety needle shield is used as one part of the syringe structure and communicated with the needle seatThe connection is through a ring sleeve. The disposable needle cap is removed and the safety shield is pivoted away from the needle, after the injection is completed, the safety shield is then pivoted back and locked in position covering the needle. The ring sleeve is connected on the needle base and has the following three requirements: firstly, the clamping is permanent clamping and cannot be accidentally dropped; secondly, the ring sleeve positions and connects the needle seat at the position most suitable for injection, and the most suitable injection mode can be understood as follows: the user typically needs to orient the needle ' bevel up ' for injection, where the safety shield should not obstruct the user's view on the left and right sides of the injection needle. If the safety shield cannot rotate on the needle mount, the orientation of the safety shield and the needle cannot be guaranteed, whereas if the safety shield can rotate freely, the safety shield may naturally rotate to the blocking position; thirdly, the rotation of the ring sleeve relative to the needle base can adjust the torque to meet a certain force range, and the ring sleeve crosses the jumping ridge torque M of each ridge relative to the concave-convex groove of the needle base to screw out the screw-out torque M of the needle base of the injection needle cylinder Rotary wrench And the hand-held ring sleeve applies rotation torque relative to the needle cylinder and gradually increases to hand pain torque M which does not cause hand pain when the hand-held ring sleeve can jump edge and rotate Pain (ache) M of Rotary wrench <M≤(M Pain (ache) -c), c being the remainder. Wherein M is Pain (ache) Can be determined by experimental data.
The prior art is a safety injection needle (publication number: CN103432657A, published: 2013.12.11) as disclosed in Meidelai, the safety needle cover comprises a sleeve 9 and a square sheet 4 hinged with the sleeve, the square sheet 4 is provided with a cylinder 5 connected with a needle seat, a safety needle cover connecting section 12 is provided with an annular convex rib and a positioning ring 8, an inner hole of the cylinder 5 deforms and expands to cross the annular convex rib, so that the cylinder 5 is positioned between the annular convex rib and the positioning ring 8 to form a clamping connection which cannot be accidentally separated, and when the cylinder 5 crosses the annular convex rib, the cylinder 5 and the safety needle cover connecting section 12 are in matched connection through frosted concave- convex grooves 10 and 15 to form a rotatable and adjustable connection. The inner hole of the cylinder 5 is forced to cross the height of the annular convex rib, and then the frosted concave- convex grooves 10 and 15 are matched, so that the two are contradictory: too high an annular bead will result in a corresponding increase in the bore diameter, resulting in too loose a frosted groove 10, 15 to M<M Rotary wrench (ii) a The annular convex ridge cannot be too low, and if the annular convex ridge is too low, the requirement is not met, and the annular convex ridge is easy to fall off accidentally. It is difficult to achieve satisfaction of both.
The delumo medical company, usa, discloses a safety needle assembly (publication No. CN1668351A, published: 20050914) in which a safety shield is attached to a hub 20 by a collar 50, the inner wall of the proximal and 52 walls of the collar 50 being provided with teeth 58 and the central portion being provided with an annular ridge 57, the annular ridge 57 being forced over the step 38 of the hub and being trapped in the lower groove 36 as the collar 50 is pressed axially into the hub 20, the axial movement being prevented by the proximal step 37 of the lower groove 36, at which point the two sets of teeth 34 on the hub engage the teeth 58 of the collar. Although the connection structure replaces the annular convex edge by the lower groove 36, the contradiction between the annular convex edge and the bore diameter of the inner bore of the tooth 58 part of the collar 50 is avoided, but the requirements II and III can not be satisfactorily solved.
Therefore, there is a need in the art for a connection structure for a safety needle shield and a needle hub that simultaneously satisfies the requirements of (i) permanently engaging the needle shield with the needle hub, (ii) positioning the needle hub with the collar at a position most suitable for injection, and (iii) adjusting the torque M by rotation of the collar relative to the needle hub to satisfy M Rotary wrench <M≤(M Pain (ache) C) reducing the precision requirement of the concave-convex structure, which is a problem to be solved urgently in the field of safe injection needles with safe needle covers in the industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a connecting structure of a safety needle shield and a needle seat and an installation method thereof, which can solve the problems that the requirements of simultaneously meeting the requirements of firstly clamping, namely permanent clamping, secondly positioning and connecting the needle seat by a ring sleeve at the position most suitable for injection and thirdly adjusting the torque M by rotating the ring sleeve relative to the needle seat to meet the requirement of M Rotary wrench <M≤(M Pain (ache) C) reducing the accuracy requirement of the concave-convex structure.
The object of the present invention is achieved by a connection arrangement for a safety needle shield and a hub, the safety needle shield comprising a collar hingedly connected to the needle shield, the collar comprising a proximal end axially adjacent to a lug of the hub and an axially opposite distal end, the hub comprising an integrally connected luer connection and a base, comprising
The elastic reverse buckle part comprises a plurality of reverse buckle elastic sheets arranged at intervals in the inner hole at the near end of the shaft collar and a containing groove arranged at the near end of the base, and the free ends of the reverse buckle elastic sheets form a clamping ring which is abutted against the annular side wall of the containing groove to form reverse buckle, so that the shaft collar cannot be separated from the needle base along the reverse direction of the pressing-in direction;
the rotary adjusting part comprises an outer ring concave-convex arranged on the peripheral surface of the base and an inner ring concave-convex arranged in an inner hole of the shaft collar, and the inner ring concave-convex is meshed with the outer ring concave-convex to form a friction damping structure;
the elastic back-off part and the rotary adjusting part are sequentially arranged from the near end to the far end along the axial direction.
Further, the base comprises an elastic deformation cylinder and a positioning cylinder, the near end of the base is integrally connected with the needle base through a connecting part, so that a deformation cavity with an axial far-end opening is arranged between the elastic deformation cylinder and the needle base; the outer ring is arranged on the outer peripheral surface of the elastic deformation cylinder in a concave-convex mode.
Further, the base comprises an inner taper sleeve, the inner taper sleeve is coaxially arranged in the elastic deformation cylinder and is integrally connected with the elastic deformation cylinder through a connecting part, the outer ring is concave-convex arranged on the periphery of the elastic deformation cylinder, and a deformation cavity is formed between the inner taper sleeve and the elastic deformation cylinder through the connecting part; the base is fitted to the outer periphery of the luer connection portion via an inner taper sleeve.
Furthermore, the far end of the inner taper sleeve is provided with an inner ring bulge, the far end of the shaft ring is provided with a pressing ring cover, and the pressing ring cover is provided with an axial bulge ring towards the near end; the far end of the Ruhr connecting part is provided with an annular clamping groove.
Further, the inner taper sleeve of the base is sleeved on the outer conical surface of the Ruhr connecting part, the shaft collar is pressed into the base along the axial direction until the axial convex ring abuts against the inner ring convex and is pressed into and clamped in the annular clamping groove, at the moment, the inner taper hole of the inner taper sleeve is in contact fit with the outer conical surface of the Ruhr connecting part, and the inner ring convex has an axial gap G in the annular clamping groove; the axial gap G is reduced by an axial displacement G1 until the reverse spring of the collar abuts the annular sidewall to form a reverse.
The elastic reverse buckling part, the rotation adjusting part and the press-in positioning part are sequentially arranged from the near end to the far end along the axial direction; when the reverse back-off is formed, the positional engagement of the collar relative to the hub only rotates the adjustment portion to function.
Furthermore, the press-in positioning comprises a positioning elastic sheet arranged at the near end of the shaft collar and a positioning groove arranged at the far end of the base, the positioning elastic sheet is one of the back-off elastic sheets, and when the elastic back-off part is pressed in along the axial direction, the positioning elastic sheet is matched with the positioning groove to form the circumferential positioning of the safety needle shield relative to the needle seat injection needle.
Furthermore, the shaft collar is provided with a back-off part, an avoiding part and a damping part in sequence from the near end to the far end, a hand-held clamping part is arranged on the periphery of the shaft collar, a plurality of back-off windows are annularly arranged on the periphery of the back-off part at intervals, back-off elastic pieces are arranged in the back-off windows, the fixed ends of the back-off elastic pieces are integrally connected with the shaft collar wall at the near end, the free ends of the back-off elastic pieces are far away from the near end, the free ends extend inwards in the radial direction relative to the fixed ends, all the free ends form a butt circle, and the diameter of the butt circle is smaller than the aperture of the damping part by 3-5 mm.
Furthermore, the inner ring concave-convex part and the outer ring concave-convex part are respectively molded with friction surfaces for increasing friction force, the wall thickness S of the elastic deformation cylinder meets the condition that S is more than or equal to 0.5mm and less than or equal to 1.2mm, when all inner convex ribs of the shaft collar cross all outer convex ribs of the base, the elastic deformation cylinder generates annular inner contraction deformation inwards, and edge jumping sound of 'snap' is generated to prompt an operator.
Furthermore, the two ends of the base are open, two elastic deformation cylinders are symmetrically arranged on the base on two sides of the connecting portion, the outer ring of each elastic deformation cylinder is concave-convex, and open deformation cavities are respectively arranged on two sides of the connecting portion.
Compared with the prior art, the connecting structure of the safety needle shield and the needle seat has the advantages that the elastic deformation part 21 can be relatively radially and inwardly contracted through the deformation cavity with the opening, so that the rotating torque of the collar relative to the needle seat is controlled in a proper range; at the same time, due to this inwardly contracting elastic deformation of the elastic deformation portion 21, a crisp "snap" rattle sound is emitted to prompt the operator when rotated.
Drawings
FIG. 1 is a front cross-sectional view of an embodiment 1 of a connecting structure of a safety needle shield and a needle hub of the present invention;
FIG. 2 is a front cross-sectional view of the collar of embodiment 1 of the connecting structure of the safety needle shield and the hub of the present invention;
fig. 3 is a sectional view a-a of fig. 2 of embodiment 1 of the connecting structure of the safety needle shield and the needle hub of the present invention.
FIG. 4 is a sectional view B-B of FIG. 2 of embodiment 1 of the connecting structure of the safety needle shield and the needle hub of the present invention;
FIG. 5 is a front cross-sectional view of the needle hub of embodiment 1 of the connecting structure of the safety needle shield and the needle hub of the present invention;
FIG. 6 is a left side view of the needle hub of embodiment 1 of the connecting structure of the safety needle shield and the needle hub of the present invention;
FIG. 7 is a front cross-sectional view of another embodiment of embodiment 1 of a connecting structure of a safety needle shield and a needle hub of the present invention;
FIG. 8 is a front cross-sectional view of embodiment 2 of a connecting structure of a safety needle shield and a needle hub of the present invention;
FIG. 9 is a front cross-sectional view of another embodiment of embodiment 2 of a connecting structure of a safety needle shield and a needle hub of the present invention;
reference numerals in the above figures:
10 collars, 11 back-off parts, 12 avoiding parts, 13 damping parts, 14 hand-held clamping parts, 15 press ring covers and 16 axial convex rings
20 base, 21 elastic deformation cylinder, 22 positioning cylinder, 23 opening cavity, 24 connecting part, 25 inner taper sleeve and 26 inner ring bulge
30 elastic reverse-buckling part, 31 reverse-buckling elastic sheet, 32 accommodating groove and 33 annular side wall
40 rotation regulating part, 41 outer ring concave-convex, 42 inner ring concave-convex, 43 friction surface
50 press-in positioning part, 51 positioning spring piece and 52 positioning groove
60 needle seat, 61 luer connecting part, 62 needle fixing part, 63 lug, 64 annular stop and 65 annular clamping groove
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings, but is not intended to limit the scope of the invention.
Example 1
A safety needle shield and hub connection structure, the safety needle shield includes a collar 10 hinged with the needle shield, the collar 10 includes a proximal end axially near the hub lug and a distal end axially opposite, the hub 60 includes a base 20 including
The elastic reverse buckle part 30, the elastic reverse buckle 30 includes a plurality of spaced reverse buckle spring sheets 31 arranged in the inner hole of the near end of the shaft collar 10 and a containing groove 32 arranged at the near end of the base 20, the free ends of the reverse buckle spring sheets form a clamping ring and abut against the annular side wall 33 of the containing groove 32 to form reverse buckle, so that the shaft collar can not be pulled out of the needle base along the reverse direction of the pressing-in direction;
a rotation adjusting portion 40 including an outer ring concave-convex 41 provided on the outer peripheral surface of the base 20 and an inner ring concave-convex 42 provided in the inner hole of the collar 10, the inner ring concave-convex 42 being fitted to the outer ring concave-convex 41 to form a friction damping structure;
the elastic reverse buckling part 30 and the rotary adjusting part 40 are sequentially arranged from the near end to the far end along the axial direction;
when the reverse back-off is formed, all the inner ring gears 42 are meshed with the entire axial thickness of the outer ring gear 41.
The hub 60 includes a luer connection portion 61 and a needle fixing portion 62, and the base 20 is fixedly connected to the outer peripheral surface of the luer connection portion 61 by an integral injection molding method to form a radial connection. The residual liquid in the conical joint is not increased compared to providing an axial connection between the luer connection 61 and the needle fixation part 62.
The diameter of the inner hole of the collar 10 is larger than that of the needle sleeve, so that the assembling sequence of the needle seat, the needle sleeve and the collar is met, when in production, the metal needle is integrally injected or fixed in the needle hole of the needle fixing part 62 through an adhesive, then the needle sleeve is sleeved outside the needle and clamped at the root part of the needle fixing part 62, finally the collar 10 is axially pressed and locked on the base 20, and the safety needle assembly is completed, and at the moment, the safety needle sleeve is positioned at the injection position on the side of the needle. When the safety needle assembly is used, the connecting cone of the syringe is screwed into the needle seat 60 until the lug is rotationally locked to the conical locking joint of the syringe, and the needle sleeve is taken off, so that the liquid can be extracted for injection. After the injection is finished, the safety needle shield is rotated to a protection position, the needle is permanently clamped by a buckle of the safety needle shield, and the safety needle shield is surrounded outside the needle to prevent accidental contact; when the safety needle shield is in the protecting position, the safety needle shield cannot be returned to the injection position due to the permanent snap fit of the snap to prevent secondary use.
Improvement on press-in positioning problem:
more preferably, the tool further comprises a press-in positioning part 50, and the elastic reverse-buckling part 30, the rotation adjusting part 40 and the press-in positioning part 50 are sequentially arranged from the proximal end to the distal end in the axial direction. The press-in positioning 50 includes a positioning elastic piece 51 disposed at the proximal end of the collar 10 and a positioning groove 52 disposed at the distal end of the base 20, and the positioning elastic piece 51 is one of the reversed buckling elastic pieces 31 and is only visually distinguishable from the other reversed buckling elastic pieces 31 in terms of shape, such as wider width. When the elastic reverse buckling part is pressed in along the axial direction, the positioning elastic sheet 51 is matched with the positioning groove 52 to form the positioning of the circumferential relative position of the safety needle shield relative to the needle seat and the injection needle thereof.
The elastic reverse-buckling portion 30, the rotation regulating portion 40, and the press-in positioning portion 50 are sequentially arranged from the proximal end to the distal end in the axial direction. The positioning groove 52 of the press-in positioning portion 50 is arranged at the far end of the needle base, the positioning elastic sheet 51 is arranged at the near end of the shaft collar, the positioning elastic sheet 51 is one of the inverted elastic sheets 31, when the shaft collar 10 is pressed into the base 20 along the axial direction, the positioning matching of the positioning elastic sheet 51 and the positioning groove 52 is firstly completed, and the positioning press-in is realized. When the reverse back-off is formed, the positioning elastic sheet 51 is abutted against the cylindrical smooth bottom wall of the containing groove 32 in the radial direction, and at the moment, the positioning fit of the collar 10 relative to the needle holder is also acted by the rotation adjusting part 40.
Improvements relating to rotational adjustment:
the rotational adjustment 40 allows a certain amount of frictional fit between the collar 10 and the hub 60 so that the collar 10 cannot rotate too freely relative to the hub 60, enabling the safety needle shield to rotate relative to the hub and the safety needle shield itself to remain in the desired position when a certain torque is applied. To satisfy requirement (c): m Rotary wrench <M≤(M Pain (ache) C) considering first the abandonment of the approach of tight tolerance fits, since the tolerances, although capable of giving such friction fits a more strict control, are such that the heat shrinkage of the injection-moulded part is great and the shrinkage of the collar 10 and of the base 20 is different, used in different temperature environments, the final fit of which does not guarantee each one of the different temperature environmentsThe frictional engagement of the collar 10 with the base 20 always satisfies M Rotary wrench <M≤(M Pain (ache) -c), special measures are also required.
The idea is to rely on elastic deformation to produce a restraining force of the inner rib over the rib height of the outer rib. The proximal end of the base 20 is integrally connected with a luer connecting part 61 through a connecting part 24, a deformation cavity 23 with an axial distal end opening is arranged between the proximal end of the base 20 and the needle seat, and the base 20 comprises an elastic deformation cylinder 21 and a positioning cylinder 22. The outer peripheral surface of the elastic deformation tube 21 is provided with an outer ring concave-convex 41. The inner hole in the middle of the collar 10 is provided with an avoidance hole 11 and inner ring convexes and concaves 42 with corresponding lengths, and when the reverse-buckling elastic sheet 31 is abutted against the annular side wall 33 of the accommodating groove 32 to form reverse buckling, the inner ring convexes and concaves 42 are engaged with the outer ring convexes and concaves 41 in whole length. The cross-sections of the ribs of the inner and outer ring reliefs 42, 41 are preferably equilateral triangles or isosceles triangles. When the inner ring concave-convex 42 is engaged with the outer ring concave-convex 41, the outer ring concave-convex 41 does not generate a radial outward force, so that a gap G from the top of the convex edge of the inner ring concave-convex 42 to the bottom of the groove of the outer ring concave-convex 41 is more than or equal to 0.1mm, and the overlapping height of the inner convex edge and the outer convex edge is more than or equal to 0.5mm and less than or equal to H Stack
≤1.5mm。
When the collar 10 is held by hand to apply a rotation torque M relative to the hub 60, all the inner convex edges of the collar 10 cross all the outer convex edges of the base 20, so that the whole peripheral wall of the elastic deformation cylinder 21 is inwards deformed in an annular inner contraction mode, when the rotation torque M enables the radial compression force of each inner convex edge on the corresponding outer convex edge to be larger than the deformation resistance force, the outer diameter of the elastic deformation cylinder 21 is inwards contracted to cross one edge, at the moment, a 'snap' sound is generated, and a clear sound prompt for entering ears is given to a torque applicator.
More preferably, the inner and outer ring irregularities 42, 41 are molded with friction surfaces 43 that increase friction, the friction surfaces 43 being a frosted or textured surface. The friction surface 43 increases friction while making the snap "more loud and crisp.
When the nominal diameter of the concave-convex matching of the collar 10 and the base 20 is 8mm and the same thermoplastic material is adopted, and the overlapping height of the inner convex edge and the outer convex edge is equal to 0.5mm, M is tested Rotary wrench ＝0.6NM,M Pain (ache) When the thickness is 5NM, the thickness S of the elastic deformation tube 21 which can generate elastic deformation is not less than 0.5mm and not more than 1.2 mm. When the wall thickness S is less than 0.5mm, the deformation resistance is very small and soft, and the edge jumping sound of 'papa' and 'papa' is not crisp and weak. The length of the concave-convex matched friction damping structure is adjusted, so that the application of the rotating torque M is most comfortable.
In summary, the friction damping structure of the inner ring concave-convex 42 and the outer ring concave-convex 41, matching with the friction surface 43 and the wall thickness S of the elastic deformation cylinder 21, satisfies 0.5mm ≤ S ≤ 1.2mm, so that the friction damping structure has proper elastic deformation resistance, and the rotation torque M satisfies the requirement M Rotary wrench <M≤(M Pain (ache) -c)。c＝0.1NM。
The improvement with respect to the resilient undercut 30 is as follows:
as shown in fig. 2, the collar 10 is provided with a back-off part 11, an escape part 12 and a damping part 13 in sequence from the proximal end to the distal end, and a hand-held holding part 14 is provided at the outer periphery of the collar, wherein the hand-held holding part 14 is a 6-8-sided polyhedron or a rib. The periphery of the inverted part 11 is annularly provided with a plurality of inverted windows 32 at intervals, inverted elastic sheets 31 are arranged in the inverted windows 32, fixed ends of the inverted elastic sheets 31 are close to the near end and integrally connected with the annular wall, free ends of the inverted elastic sheets 31 are far away from the near end, the axial length from the free ends to the fixed ends is 3-5mm, and the free ends are internally buckled, namely the free ends radially and inwards extend for 3-5mm relative to the fixed ends. The diameter of the fixed end is equal to the diameter of the inner hole, and all the free ends form an abutting circle, and the diameter of the abutting circle is 3-5mm smaller than the diameter of the inner hole of the damping part 12. The inner hole diameter of the relief part 12 is larger than that of the damping part 13.
Fig. 7 illustrates another implementation of embodiment 1. The base 20 has openings at two ends, the middle part is integrally connected with the luer connecting part 61 through the connecting part 24, two elastic deformation cylinders 21 are symmetrically arranged at two sides of the connecting part 24 of the base 20, and two deformation cavities 23 are formed between the base and the needle seat at the openings at two sides of the connecting part 24. Thus, elastic deformation occurs at both sides symmetrical to the connecting portion 24, torsional deformation occurs simultaneously at the proximal and distal ends of the collar, and rotational adjustment of the collar is balanced in the axial direction. The luer connection portion 61 is provided with an annular stop 64 on the outer surface thereof, and the annular stop 64 and the lug 63 form the accommodating groove 32 therebetween.
Example 2
The integral connection is changed into conical surface matching adjustment, and other structures are the same as those of the embodiment 1.
As shown in fig. 8, in a connecting structure of a safety needle shield and a needle seat, a base 20 comprises an inner conical sleeve 25, the inner conical sleeve 25 is coaxially arranged in an elastic deformation cylinder 21 and is integrally connected with the elastic deformation cylinder 21 at a near end through a connecting part 24, an outer ring concave-convex part 41 is arranged on the periphery of the elastic deformation cylinder 21, the connecting part 24 enables a deformation cavity 23 to be formed between the inner conical sleeve 25 and the elastic deformation cylinder 21, and a far end of the deformation cavity 23 is opened. The distal end of the luer connecting part 61 is provided with an annular clamping groove 65, and the distal end of the inner taper sleeve 25 is provided with an inner annular protrusion 26. The collar 10 is provided with a pressure ring cover 15 at the distal end and an axially protruding ring 16 towards the proximal end of the pressure ring cover 15.
The inner taper sleeve 25 of the base 20 is sleeved on the outer conical surface of the luer connecting part 61, the shaft collar 10 is pressed into the base 20 along the axial direction until the axial convex ring 16 presses against the inner annular convex 26 and presses the inner annular convex 26 into the annular clamping groove 65 in a clamping manner, at the moment, the inner taper hole of the inner taper sleeve 25 is matched with the outer conical surface of the luer connecting part 61, and the inner annular convex 26 has an axial gap G in the annular clamping groove 65. The axial pressing in of the collar 10 is continued until the reverse snap 31 of the collar abuts against the annular side wall 33 to form a reverse snap, the axial gap G being reduced by an axial displacement G1.
The inner wall thickness of the inner taper sleeve 25 is adjusted, or a plurality of open grooves are respectively arranged at the two ends of the inner taper sleeve 25 at intervals, so that the inner taper sleeve can expand greatly to generate elastic deformation.
Except that the friction surface 43 and the wall thickness S of the elastic deformation cylinder 21 meet 0.5 mm-S-1.2 mm and the deformation cavity 23 ensures that the friction surface has proper elastic deformation resistance, and the rotating torque M meets the requirement M Rotary wrench <M≤(M Pain (ache) -c). With the axial displacement G1, the radially expanding inner cone 25 of the luer connection portion results in an increase in the outer diameter of the elastically deformable tube 21, which exerts a radially outward pre-stressing force on the inner ring protrusion 42 of the collar 10, thereby increasing the rotational torque M of the rotational adjustment. This results in a frictional damping structure formed by the inner ring relief 42 and the outer ring relief 41, even if the dimensional accuracy of the injection mold is reduced due to the number of times of injection molding, the rotation of the injection-molded needle hub and safety needle shieldThe torque M does not decrease.
By adjusting the length of the axial displacement G1, the matching pretightening force of the friction damping structure can be adjusted, so that the rotation torque is adjusted to M Rotary wrench <M≤(M Pain (ache) -c) and accompanying a crisp "" snap "jump to indicate to the rotator that several ribs have been adjusted. Such adjustment is much easier than adjusting the nominal diameter tolerances of the inner ring embossment 42 and the outer ring embossment 41.
Fig. 9 illustrates another implementation of embodiment 2. The base 20 has two open ends, the middle part is connected with the luer connection part 61 through the connection part 24, two elastic deformation cylinders 21 are symmetrically arranged on the two sides of the connection part 24 of the base 20, and a deformation cavity 23 is formed between the base and the needle seat at the two open ends of the connection part 24. Thus, elastic deformation occurs at both sides symmetrical to the connecting portion 24, torsional deformation occurs simultaneously at the proximal and distal ends of the collar, and rotational adjustment of the collar is balanced in the axial direction. The luer connection portion 61 is provided with an annular stop 64 on the outer surface thereof, and the annular stop 64 and the lug 63 form the accommodating groove 32 therebetween.
The connecting structure of the safety needle shield and the needle seat adopts the following technical means to solve the problems that the connection structure can simultaneously meet the requirements that firstly, the needle seat is clamped and connected permanently, secondly, the ring sleeve is positioned and connected with the needle seat in a most suitable injection mode, and thirdly, the rotation adjusting torque M of the ring sleeve relative to the needle seat meets the requirement that M is met Rotary wrench <M≤(M Pain (ache) -c), a technical problem of reducing the accuracy requirements of the relief structure ":
(1) adjusting rotational torque through elastic deformation, deformation cavity and certain wall thickness range
The purpose of adjusting the rotating torque of the inner ring concave-convex relative to the outer ring concave-convex is achieved by utilizing elastic deformation. The elastically deformable portion 21 forms a distally open deformable cavity 23 with the luer connection portion 61 or the inner taper sleeve 25 of the needle holder 60 through the connection portion 24. And in addition, a certain wall thickness range is selected, so that the elastic deformation part generates elastic deformation when the concave-convex inner convex edge of the inner ring exceeds the concave-convex outer convex edge of the outer ring, and the whole circle radially inwards shrinks a convex edge height. The rotating torque M meets the requirement (M) by adjusting the wall thickness of the elastic deformation part Rotary wrench <M≤(M Pain (ache) -c)。
(2) The axial movement of the inner taper sleeve generates a radial outward pre-tightening force.
When the axial convex ring 16 presses against the inner annular convex 26 and presses the inner annular convex 26 into the annular clamping groove 65, the inner taper sleeve 25 is matched with the outer taper surface of the luer connection part, and the axial displacement is continued until the reverse-buckling elastic sheet 31 is abutted against the annular side wall 33 to form reverse buckling, and the force makes the inner taper sleeve expand to cause the outer annular concave-convex 41 of the elastic deformation part 21 to apply a radial outward pre-tightening force to the outer annular concave-convex 42 of the collar 10.
(3) Positioning during pressing, rotating after fitting, and changing positioning
The elastic reverse buckling part 30, the rotary adjusting part 40 and the press-in positioning part 50 are sequentially arranged from the near end to the far end along the axial direction, the positioning elastic sheet 51 is one of the reverse buckling elastic sheets 31, and the positioning elastic sheet 51 is abutted against the positioning groove 52 to form press-in positioning when pressed in; when the reverse back-off is formed, the press-in positioning axially moves over and does not have a matching relation, so that the safety needle shield can be rotatably adjusted to further change the positioning of the safety needle shield relative to the needle seat, and the beneficial effects of flexible positioning and no influence on adjustment are realized.
Compared with the prior art, the connecting structure of the safety needle shield and the needle seat has the advantages that the elastic deformation part 21 can be relatively radially and inwardly contracted through the deformation cavity with the opening, so that the rotating torque of the collar relative to the needle seat is controlled in a proper range; at the same time, due to this inwardly contracting elastic deformation of the elastic deformation portion 21, a crisp "snap" rattle sound is emitted to prompt the operator when rotated.
Claims (10)
1. A connection structure of a safety needle shield and a needle seat, the safety needle shield comprises a shaft ring (10) which is hinged with the needle shield, the shaft ring (10) comprises a near end which is axially close to a lug of the needle seat and a far end which is axially opposite, the needle seat (60) comprises a Ruhr connection part (61) and a base (20) which are integrally connected, and the connection structure is characterized by comprising
The elastic reverse buckle part (30), the elastic reverse buckle (30) comprises a plurality of reverse buckle elastic sheets (31) arranged at intervals in the inner hole at the near end of the shaft collar (10) and a containing groove (32) arranged at the near end of the base (20), the free ends of the reverse buckle elastic sheets form a clamping ring and abut against the annular side wall (33) of the containing groove (32) to form reverse buckle, so that the shaft collar cannot be reversely pulled out of the needle base along the pressing-in direction;
the rotary adjusting part (40) comprises an outer ring concave-convex part (41) arranged on the outer peripheral surface of the base (20) and an inner ring concave-convex part (42) arranged in an inner hole of the shaft ring 10, and the inner ring concave-convex part (42) is meshed with the outer ring concave-convex part (41) to form a friction damping structure;
the elastic reverse buckling part (30) and the rotary adjusting part (40) are sequentially arranged from the near end to the far end along the axial direction.
2. The connecting structure of the safety needle shield and the needle seat in claim 1 is characterized in that the base (20) comprises an elastic deformation cylinder (21) and a positioning cylinder (22), the proximal end of the base (20) is integrally connected with the needle seat (60) through a connecting part (24), so that a deformation cavity (23) with an axial distal opening is arranged between the elastic deformation cylinder (21) and the needle seat; the outer ring concave-convex part (41) is arranged on the peripheral surface of the elastic deformation cylinder (21).
3. The safety needle shield and needle holder coupling structure of claim 1, wherein the base (20) comprises an inner cone sleeve (25), the inner cone sleeve (25) is coaxially disposed in the elastically deformable tube (21) and integrally connected to the elastically deformable tube (21) through a connecting portion (24), the elastically deformable tube (21) is provided at its periphery with said outer ring protrusions and recesses (41), and the connecting portion (24) forms a deformable cavity (23) between the inner cone sleeve (25) and the elastically deformable tube (21); the base (20) is fitted to the outer periphery of the luer connection part (61) via an inner taper sleeve (25).
4. The safety needle shield and hub connection structure according to claim 3, wherein the distal end of the inner cone sleeve (25) is provided with an inner annular protrusion (26), the distal end of the collar (10) is provided with a press ring cover (15), and the press ring cover (15) is provided with an axial protrusion ring (16) towards the proximal end; the distal end of the luer connecting part (61) is provided with an annular clamping groove (65).
5. The safety needle shield and hub connection structure according to claim 4, wherein the inner collar (25) of the base (20) is fitted over the outer tapered surface of the luer connection portion (61), the collar (10) is axially pressed into the base (20) until the axial male ring (16) presses against the inner annular projection (26) and snaps into the annular groove (65), at which point the inner tapered bore of the inner collar (25) is in contact fit with the outer tapered surface of the luer connection portion (61), and the inner annular projection (26) has an axial gap G within the annular groove (65); the axial pressing in of the collar (10) is continued until the reverse snap spring (31) of the collar abuts against the annular side wall (33) to form reverse snap, and the axial gap G is reduced by an axial displacement G1.
6. The connecting structure of the safety needle shield and the needle holder according to any one of claims 1 to 5, further comprising a press-in positioning portion (50), wherein the elastic reverse-buckling portion (30), the rotation regulating portion (40) and the press-in positioning portion (50) are sequentially arranged from the proximal end to the distal end in the axial direction; when the reverse back-off is formed, the positional engagement of the collar (10) with respect to the hub (60) only rotates the regulating portion (40) to function.
7. The safety needle shield and hub connection structure according to claim 6, wherein the press-in detent (50) comprises a detent spring (51) disposed at the proximal end of the collar (10) and a detent groove (52) disposed at the distal end of the base (20), the detent spring (51) is one of the inverted snap springs (31), and when the resilient inverted portion is pressed in axially, the detent spring (51) cooperates with the detent groove (52) to form a circumferential detent of the safety needle shield relative to the needle of the hub.
8. The connecting structure of the safety needle shield and the needle seat according to any one of claims 1 to 5, wherein the shaft collar (10) is provided with a back-off part (11), an avoiding part (12) and a damping part (13) in sequence from a near end to a far end, a hand-held clamping part (14) is arranged on the periphery of the shaft collar, a plurality of back-off windows (32) are arranged on the periphery of the back-off part (11) at intervals in an annular manner, back-off elastic sheets (31) are arranged in the back-off windows (32), the fixed ends of the back-off elastic sheets (31) are integrally connected with the shaft collar wall at the near end, the free ends of the back-off elastic sheets (31) are far away from the near end, the free ends extend inwards in a radial direction relative to the fixed ends, all the free ends form a butting circle, and the diameter of the butting circle is 3-5mm smaller than the aperture of the damping part (12).
9. A connection arrangement for a safety needle shield and hub according to any one of claims 1 to 5, characterised in that the inner annular ridge (42) and the outer annular ridge (41) are each moulded with a friction surface (43) to increase friction, and the wall thickness S of the resiliently deformable sleeve (21) is such that 0.5mm S1.2 mm is satisfied such that the resiliently deformable sleeve (21) contracts inwardly and provides a' snap sound to alert the operator when all the inner ridges of the collar (10) ride over all the outer ridges of the base (20).
10. The connecting structure of the safety needle shield and the needle seat according to the claim 2 or 3 is adopted, wherein, two ends of the base (20) are opened, two elastic deformation cylinders (21) are symmetrically arranged on the two sides of the connecting part (24) of the base (20), the periphery of the elastic deformation cylinders (21) is provided with an outer ring concave-convex part (41), and two sides of the connecting part (24) are respectively provided with an opened deformation cavity (23).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210581610.XA CN115054781B (en) | 2022-05-26 | 2022-05-26 | Connection structure of safety needle cover and needle seat |
| DE202023100848.8U DE202023100848U1 (en) | 2022-05-26 | 2023-02-23 | Connection structure for safety pin sheath and needle holder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210581610.XA CN115054781B (en) | 2022-05-26 | 2022-05-26 | Connection structure of safety needle cover and needle seat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115054781A true CN115054781A (en) | 2022-09-16 |
| CN115054781B CN115054781B (en) | 2024-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210581610.XA Active CN115054781B (en) | 2022-05-26 | 2022-05-26 | Connection structure of safety needle cover and needle seat |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115054781B (en) |
| DE (1) | DE202023100848U1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115054781B (en) | 2024-05-31 |
| DE202023100848U1 (en) | 2023-03-09 |
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