CN115054781B - Connection structure of safety needle cover and needle seat - Google Patents
Connection structure of safety needle cover and needle seat Download PDFInfo
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- CN115054781B CN115054781B CN202210581610.XA CN202210581610A CN115054781B CN 115054781 B CN115054781 B CN 115054781B CN 202210581610 A CN202210581610 A CN 202210581610A CN 115054781 B CN115054781 B CN 115054781B
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- 238000013016 damping Methods 0.000 claims abstract description 17
- 230000005489 elastic deformation Effects 0.000 claims description 51
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000003814 drug Substances 0.000 description 13
- 239000012634 fragment Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 206010033425 Pain in extremity Diseases 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000036316 preload Effects 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
- 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
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011148 porous material 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
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
Landscapes
- 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
The connecting structure of the safety needle cover and the needle seat comprises a collar (10), the needle seat (60) comprises a base (20) and comprises an elastic back-off part (30) and a rotation adjusting part (40), and the elastic back-off part (30) comprises a plurality of back-off elastic sheets (31) and a containing groove (32) which are spaced; 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 back-off part (30) and the rotation adjusting part (40) are sequentially arranged from the proximal end to the distal end along the axial direction. The connecting structure of the safety needle cover and the needle seat can control and adjust the rotation torque M of the collar relative to the needle seat, and simultaneously, the safety needle cover and the needle seat generate clear and crisp 'snap' jump edge during rotation.
Description
Technical Field
The invention relates to the field of safety injection needles, in particular to a connecting structure of a safety needle cover and a needle seat and an installation method thereof.
Background
The safety syringe structure must have the protective action of a safety needle cover: after the injection is completed, the relevant parts thereon are displaced to protect the used needle tip: such as rotation of the safety needle shield. The safety needle shield is connected to the needle hub by a collar as part of the syringe structure. The disposable needle cap is removed and the safety shield is pivoted away from the needle, after the injection is completed, and then the safety shield is pivoted back and locked in place covering the needle. The ring sleeve is connected with the needle seat, and has the following three requirements: ① The clamping is performed permanently, so that the device cannot accidentally fall off; ② The loop positions the connection hub in the most suitable injection position, which can be understood as: 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 needle cannot be guaranteed, and if the safety shield can rotate freely, the safety shield may naturally rotate to the blocking position; ③ The rotation adjusting torque of the ring sleeve relative to the needle seat needs to meet a certain force range, the jump edge torque M of the concave-convex groove of the ring sleeve relative to the needle seat passes through each edge, the torque M is between the unscrewing torque M Rotary screw of the syringe out of the needle seat and the hand pain torque M Pain relieving medicine which does not cause hand pain when the hand ring sleeve rotates relative to the syringe when the rotation torque is applied to the syringe, and M Rotary screw <M≤(M Pain relieving medicine -c) is the rest. Wherein M Pain relieving medicine can be determined by experimental data.
A safety injection needle (publication No. CN103432657a, publication No. 2013.12.11) disclosed in the prior art, 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 edge and a positioning ring 8, an inner hole of the cylinder 5 deforms and expands to pass over the annular convex edge so that the cylinder 5 is positioned between the annular convex edge and the positioning ring 8 to form a buckle connection which can not be accidentally dropped, and when the cylinder 5 passes over the annular convex edge, the cylinder 5 and the safety needle cover connecting section 12 are connected in a matched manner through frosted concave-convex grooves 10 and 15 to form a rotationally adjustable connection. The inner hole of the cylinder 5 is forced to exceed the height of the annular convex edge, and then the frosted concave-convex grooves 10 and 15 are matched, so that the contradiction exists between the two: if the annular convex edges are too high, the pore diameter of the inner hole is correspondingly increased, so that the frosted concave-convex grooves 10 and 15 are too loose, and M is smaller than M Rotary screw ; the annular rib cannot be too low, and if the annular rib is too low, the annular rib cannot meet the requirement ① and is easy to fall off accidentally. It is difficult to achieve both satisfactorily.
U.S. patent Lu Mo, medical company, discloses a safety needle assembly (publication number: CN1668351a, publication date: 20050914) in which a safety shield is attached to a hub 20 by a collar 50, the collar 50 being provided with teeth 58 near the inner bore wall of 52, and an annular ridge 57 in the middle, the annular ridge 57 being forced over the step 38 of the hub into the lower recess 36 when the collar 50 is pressed axially into the hub 20 and the step 37 proximal to the lower recess 36 preventing this axial movement, at which point two sets of teeth 34 on the hub engage with the teeth 58 of the collar. The connection structure avoids the contradiction between the annular rib and the bore diameter of the tooth 58 of the collar 50 by replacing the annular rib with the lower groove 36, but still does not satisfactorily solve the requirements ② and ③.
Therefore, the connection structure of the safety needle cover and the needle seat is urgently needed in the field, the connection structure can simultaneously meet the requirement that ① is clamped in, namely permanently clamped, the ② ring sleeve is positioned and connected with the needle seat at the most suitable position for injection, the rotation adjusting torque M of the ③ ring sleeve relative to the needle seat meets M Rotary screw <M≤(M Pain relieving medicine -c), the precision requirement of the concave-convex structure is reduced, and the connection structure is an urgent problem in the field of safety injection needles with safety 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 cover and a needle seat and an installation method thereof, which solve the technical problems that the connecting structure can simultaneously meet the requirements of ① clamping in, namely permanent clamping, ② ring sleeve is used for positioning and connecting the needle seat at the most suitable injection position, and ③ ring sleeve rotation adjusting torque M relative to the needle seat meets M Rotary screw <M≤(M Pain relieving medicine -c) and reduces the precision requirement of a concave-convex structure.
The object of the invention is achieved by a coupling structure for a safety needle shield and a needle 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 needle hub and an axially opposite distal end, the needle hub comprising an integrally connected luer connection and a base comprising
The elastic back-off part comprises a plurality of back-off elastic pieces arranged at intervals in an inner hole at the proximal end of the shaft collar and a containing groove arranged at the proximal end of the base, and the free end of the back-off elastic pieces forms a clamping ring which is abutted against the annular side wall of the containing groove to form a reverse back-off, so that the shaft collar cannot be pulled out of the needle seat along the reverse direction of the pressing-in direction;
the rotation adjusting part comprises an outer ring concave-convex arranged on the outer peripheral surface of the base and an inner ring concave-convex arranged in an inner hole of the 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 rotation adjusting part are sequentially arranged from the proximal end to the distal end along the axial direction.
Further, the base comprises an elastic deformation barrel and a positioning barrel, and the proximal end of the base is integrally connected with the needle seat through a connecting part, so that a deformation cavity with an axial distal end opening is arranged between the elastic deformation barrel and the needle seat; the outer ring is arranged on the outer circumferential 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 integrally connected with the elastic deformation cylinder through a connecting part, the outer circumference of the elastic deformation cylinder is provided with the outer ring concave-convex, and the connecting part enables a deformation cavity to be formed between the inner taper sleeve and the elastic deformation cylinder; the base is matched with the periphery of the luer connection part through an inner taper sleeve.
Further, the distal end of the inner cone sleeve is provided with an inner ring bulge, the distal end of the collar is provided with a press ring cover, and the press ring cover is provided with an axial bulge loop towards the proximal end; the distal end of the luer connection part is provided with an annular clamping groove.
Further, the inner taper sleeve of the base is sleeved on the outer taper surface of the luer connecting part, the collar is pressed into the base along the axial direction until the axial convex ring abuts against the inner annular convex ring and is pressed into and clamped in the annular clamping groove, at the moment, the inner taper hole of the inner taper sleeve is contacted and matched with the outer taper surface of the luer connecting part, and an axial gap G is formed in the annular clamping groove by the inner annular convex ring; the collar is continuously pressed in along the axial direction until the reverse buckling elastic sheet of the collar is abutted against the annular side wall to form reverse buckling, and the axial displacement G1 is reduced by the axial gap G.
Further, the device also comprises a press-in positioning part, wherein the elastic back-off part, the rotation adjusting part and the press-in positioning part are sequentially arranged from the proximal end to the distal end along the axial direction; when the reverse undercut is formed, the positioning engagement of the collar relative to the hub is effected only by the rotation adjustment portion.
Further, the press-in positioning comprises a positioning elastic sheet arranged at the proximal end of the collar and a positioning groove arranged at the distal end of the base, wherein the positioning elastic sheet is one of the back-off elastic sheets, and when the elastic back-off part is axially pressed in, the positioning elastic sheet is matched with the positioning groove to form circumferential positioning of the safety needle cover relative to the needle seat injection needle.
Further, the collar is equipped with back-off portion, dodge portion and damping portion in proper order from the proximal end to the distal end, and the collar periphery is equipped with holds the portion of holding, back-off portion periphery annular interval is equipped with a plurality of back-off windows, is equipped with the back-off shell fragment in the back-off window, and the stiff end of back-off shell fragment is in the integrative collar wall of connecting of proximal end, and the free end of back-off shell fragment is kept away from the proximal end, and the free end radially inwards extends for the stiff end, and all free ends constitute the butt circle, and this butt circle diameter is less than damping portion aperture 3-5mm.
Further, the inner ring concave-convex and the outer ring concave-convex are respectively molded with friction surfaces for increasing friction force, and the wall thickness S of the elastic deformation barrel is more than or equal to 0.5mm and less than or equal to 1.2mm, so that when all the inner ribs of the shaft collar cross all the outer ribs of the base, the elastic deformation barrel is enabled to generate annular inward shrinkage deformation inwards, and a 'snap' jump edge sound is generated to prompt an operator.
Further, the two ends of the base are opened, the two sides of the connecting part of the base are symmetrically provided with two elastic deformation barrels, the periphery of each elastic deformation barrel is provided with an outer ring concave-convex, and the two sides of the connecting part are respectively provided with an open deformation cavity.
Compared with the prior art, the connecting structure of the safety needle cover and the needle seat ensures that the elastic deformation part 21 can be contracted inwards relative to the radial direction through the deformation cavity of the opening, thereby controlling the rotation torque of the collar relative to the needle seat in a proper range; meanwhile, due to the elastic deformation of the elastic deformation portion 21, a crisp "snap" is generated to prompt the operator when rotating.
Drawings
Fig. 1 is a front cross-sectional view of embodiment 1 of a connection 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 a connection structure of a safety needle shield and a needle hub of the present invention;
fig. 3 is a sectional view A-A of fig. 2 showing an embodiment 1 of a connection structure of a safety needle cover and a needle holder according to the present invention.
Fig. 4 is a B-B sectional view of fig. 2 showing an embodiment 1 of a connection structure of a safety needle cover and a needle holder according to the present invention;
Fig. 5 is a front cross-sectional view of the needle mount of embodiment 1 of a connection structure of a safety needle shield and the needle mount of the present invention;
Fig. 6 is a left side view of the needle mount of embodiment 1 of a connection structure of the safety needle shield and the needle mount of the present invention;
Fig. 7 is a front cross-sectional view of another embodiment of embodiment 1 of a connection 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 connection 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 connection structure of a safety needle shield and a needle hub of the present invention;
reference numerals in the above figures:
10 collar, 11 back-off part, 12 avoiding part, 13 damping part, 14 hand holding clamping part, 15 pressing ring cover, 16 axial convex ring
20 A base, 21 an elastic deformation cylinder, 22 a positioning cylinder, 23 an open cavity, 24 a connecting part, 25 an inner taper sleeve and 26 an inner ring convex
30 Elastic back-off part, 31 back-off spring piece, 32 accommodating groove, 33 annular side wall and 35 back-off window
40 Rotation adjusting portion, 41 outer ring concave-convex, 42 inner ring concave-convex, 43 friction surface
50 Press-in positioning part, 51 positioning spring plate and 52 positioning groove
60 Needle seat, 61 luer connection part, 62 needle fixing part, 63 lug, 64 annular stop, 65 annular clamping groove
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings, which are not intended to limit the scope of the invention.
Example 1
A coupling structure of a safety needle shield and a needle hub, the safety needle shield including a collar 10 hingedly connected to the needle shield, the collar 10 including a proximal end axially adjacent a boss of the needle hub and an axially opposite distal end, the needle hub 60 including a base 20 including
The elastic back-off part 30, wherein the elastic back-off part 30 comprises a plurality of back-off elastic pieces 31 arranged at intervals in an inner hole at the proximal end of the collar 10 and a containing groove 32 arranged at the proximal end of the base 20, and the free end of the back-off elastic pieces forms a clamping ring which is abutted against the annular side wall 33 of the containing groove 32 to form a back-off, so that the collar cannot be pulled out of the needle seat 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 back-off part 30 and the rotation adjusting part 40 are sequentially arranged from the proximal end to the distal end along the axial direction;
when the reverse undercut is formed, all the ring gears 42 are engaged with the entire axial thickness of the outer ring gear 41.
The needle holder 60 includes a luer connection portion 61 and a needle fixing portion 62, and the base 20 is fixedly connected to the outer circumferential surface of the luer connection portion 61 by integral injection molding to form a radial connection. The residual liquid in the conical connector is not increased compared to providing an axial connection between the luer connection 61 and the needle fixation 62.
The diameter of the inner hole of the collar 10 is larger than that of the sleeve, so that the assembly sequence of the needle seat, the needle, the sleeve and the collar is met, during production, firstly, the metal needle is integrally injected or fixed in the needle hole of the needle fixing part 62 through the adhesive, then the sleeve is sleeved outside the needle and is clamped at the root 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 cover is positioned at the injection position at the side of the needle. When the safety needle assembly is used, the connecting cone of the syringe is screwed into the needle hub 60 until the lugs are rotationally locked to the conical locking tabs of the syringe, and the needle hub is removed to withdraw fluid for injection. After the injection is finished, rotating the safety needle cover to a protection position, wherein the buckle of the safety needle cover permanently clamps the needle and the safety needle cover surrounds the needle to prevent accidental contact; when the safety needle shield is in the protecting position, the safety needle shield can not return to the injecting position due to the permanent clamping of the buckle, so that the secondary use is prevented.
Improvement of the press-in positioning problem:
More preferably, the device further comprises a press-in positioning part 50, and the elastic back-off 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 along the axial direction. The press-in positioning 50 includes a positioning spring 51 disposed at a proximal end of the collar 10 and a positioning groove 52 disposed at a distal end of the base 20, where the positioning spring 51 is one of the back-off spring 31, and is only visually distinguishable from the other back-off spring 31 in terms of appearance, such as a wider width. When the elastic back-off 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 safety needle cover relative to the circumferential relative positions of the needle seat and the injection needle thereof.
The elastic back-off portion 30, the rotation adjusting 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 pressing-in positioning portion 50 is disposed at the distal end of the needle seat, the positioning spring plate 51 is disposed at the proximal end of the collar, and the positioning spring plate 51 is one of the back-off spring plates 31, when the collar 10 is pressed into the base 20 along the axial direction, the positioning cooperation between the positioning spring plate 51 and the positioning groove 52 is first completed, so as to realize positioning pressing-in. When the reverse buckle is formed, the positioning spring piece 51 is radially abutted against the cylindrical smooth bottom wall of the accommodating groove 32, and at the moment, the positioning fit of the collar 10 relative to the needle seat is also acted on by the rotation adjusting part 40.
Improvement in terms of rotation adjustment:
The rotation adjustment 40 allows a certain amount of friction 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 shield to rotate relative to the hub and to retain the safety shield itself in the desired position when a certain torque is applied. To meet the requirements ③：M Rotary screw <M≤(M Pain relieving medicine -c), consider first the approach of omitting the tight tolerance fit, since the tolerance, while giving such a friction fit for tighter control, is large in the heat shrinkage of the injection molded part and the shrinkage of the collar 10 and the base 20 are different, used in different temperature environments, and its final fit does not guarantee that the friction fit of each collar 10 and base 20 always meets M Rotary screw <M≤(M Pain relieving medicine -c), and also requires special measures.
The idea is to rely on elastic deformation to create a high restraining force for the inner rib to ride over the outer rib. The proximal end of the base 20 is integrally connected with the luer connecting part 61 through the connecting part 24, a deformation cavity 23 with an axial distal end opening is arranged between the proximal end of the base and the needle seat, and the base 20 comprises an elastic deformation barrel 21 and a positioning barrel 22. The outer circumferential surface of the elastic deformation tube 21 is provided with outer ring irregularities 41. The inner hole in the middle of the collar 10 is provided with an avoidance hole 11 and an inner ring concave-convex 42 with a corresponding length, 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 concave-convex 42 is meshed with the outer ring concave-convex 41 with a whole length. The cross sections of the ribs of the inner ring concave-convex 42 and the outer ring concave-convex 41 are preferably equilateral triangles or isosceles triangles. When the inner ring concave-convex 42 is meshed with the outer ring concave-convex 41, the outer ring concave-convex 41 does not generate radial outward force, so that the gap G between the top of the convex edge of the inner ring concave-convex 42 and 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 Folding device
≤1.5mm。
When the hand-held collar 10 applies a rotational torque M relative to the hub 60, when all the inner ribs of the collar 10 pass over all the outer ribs of the base 20, the whole circumferential wall of the elastic deformation barrel 21 is caused to generate annular inward shrinkage deformation, when the radial compression force of each inner rib acting on the corresponding outer rib is greater than the deformation resistance, the outer diameter of the elastic deformation barrel 21 is retracted to pass over one rib, and at the moment, a 'snap' of a sound of the jump rib occurs, so that a sound prompt for clearly entering the ear is given to a torque applicator.
More preferably, the inner ring relief 42 and the outer ring relief 41 are molded with friction surfaces 43 that increase friction, the friction surfaces 43 being frosted or textured surfaces. The friction surface 43 increases friction while making the jump ring "snap" louder and crunchier.
When the nominal diameter of the concave-convex fit of the collar 10 and the base 20 is 8mm and the same thermoplastic material is used and the overlapping height of the inner rib and the outer rib is equal to 0.5mm, the wall thickness S of the elastically deformable tube 21 capable of generating elastic deformation is 0.5 mm.ltoreq.s.ltoreq.1.2 mm when M Rotary screw ＝0.6NM,M Pain relieving medicine =5 NM is tested. When the wall thickness S exceeds 1.2mm, the deformation force is large, the pain caused by hand twisting is not changed to one edge, and when the wall thickness S is smaller than 0.5mm, the deformation resistance is small, the wall thickness S is very soft, and the jumping edges of the snap are not crisp and weak. The length of the friction damping structure with concave-convex fit is adjusted so that the application of the rotation torque M is most comfortable.
In summary, the friction damping structures of the inner ring concave-convex 42 and the outer ring concave-convex 41, the wall thickness S of the friction surface 43 and the elastic deformation barrel 21 are matched to meet the requirement that S is more than or equal to 0.5mm and less than or equal to 1.2mm, so that the friction damping structure has proper elastic deformation resistance, and the rotation torque M meets the requirement M Rotary screw <M≤(M Pain relieving medicine -c. c=0.1 NM.
The improvement regarding the elastic back-off portion 30 is as follows:
As shown in fig. 2, the collar 10 is provided with an inverted buckle portion 11, an avoidance portion 12 and a damping portion 13 in sequence from the proximal end to the distal end, the outer periphery of the collar is provided with a hand-holding clamping portion 14, and the hand-holding clamping portion 14 is a polyhedron or a rib with 6-8 faces. The periphery of the back-off part 11 is annularly provided with a plurality of back-off windows 35 at intervals, the back-off windows 35 are internally provided with back-off elastic pieces 31, the fixed ends of the back-off elastic pieces 31 are close to the proximal end and are integrally connected with the collar wall, the free ends of the back-off elastic pieces 31 are far away from the proximal 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 extend inwards by 3-5mm relative to the radial directions of 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 smaller than the diameter of the inner hole of the damping part 12 by 3-5mm. The diameter of the inner hole of the avoidance part 12 is larger than that of the inner hole of the damping part 13.
Fig. 7 illustrates another embodiment of embodiment 1. The two ends of the base 20 are opened, the middle part is integrally connected with the luer connecting part 61 through the connecting part 24, the two sides of the connecting part 24 of the base 20 are symmetrically provided with two elastic deformation barrels 21, and two deformation cavities 23 are formed between the base and the needle seat at the two sides of the connecting part 24. In this way, elastic deformation occurs symmetrically on both sides of the connection 24, simultaneously torsion deformation is produced at the proximal and distal ends of the collar, the rotational adjustment of the collar being balanced in the axial direction. The luer connection 61 has an annular stop 64 on its outer surface, with a receiving slot 32 formed between the stop 64 and the lug 63.
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, a connecting structure of a safety needle cover and a needle seat, a base 20 comprises an inner taper sleeve 25, the inner taper sleeve 25 is coaxially arranged in an elastic deformation barrel 21 and integrally connected with the elastic deformation barrel 21 at a proximal end through a connecting part 24, an outer ring concave-convex 41 is arranged on the periphery of the elastic deformation barrel 21, a deformation cavity 23 is formed between the inner taper sleeve 25 and the elastic deformation barrel 21 through the connecting part 24, and a distal end opening of the deformation cavity 23 is formed. The distal end of the luer connection 61 is provided with an annular clamping groove 65 and 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 convex ring 16 towards the proximal end.
The inner taper sleeve 25 of the base 20 is sleeved on the outer conical surface of the luer connecting part 61, the collar 10 is pressed into the base 20 along the axial direction until the axial convex ring 16 abuts against the inner annular convex ring 26 and the inner annular convex ring 26 is pressed into and clamped with the annular clamping groove 65, 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 an axial gap G exists in the annular clamping groove 65 of the inner annular convex ring 26. The axial pressing in of the collar 10 is continued until the reverse buckling spring 31 of the collar abuts against the annular side wall 33 to form a reverse buckling, and the axial gap G is reduced by an axial displacement G1.
The thickness of the inner wall of the inner taper sleeve 25 is adjusted, or a plurality of open slots are respectively arranged at two ends of the inner taper sleeve 25 at intervals, so that the inner taper sleeve can expand and elastically deform.
Except that the friction surface 43, the wall thickness S of the elastic deformation barrel 21 meets 0.5 mm.ltoreq.S.ltoreq.1.2 mm and the deformation cavity 23 so as to have proper elastic deformation resistance, the rotation torque M meets the requirement M Rotary screw <M≤(M Pain relieving medicine -c). c=0.1 NM, because of this axial displacement G1, radially enlarging the luer connection outer conical surface by the inner conical sleeve 25 results in an increase in the outer diameter of the elastically deformable tube 21, thereby forming a radially outward preload on the inner ring relief 42 of the collar 10, thereby increasing the rotational torque M of the rotational adjustment. This results in a friction damping structure composed of the inner ring concave-convex 42 and the outer ring concave-convex 41, and even when the dimensional accuracy of the injection mold is lowered due to the number of injection molding, the rotational torque M of the injection-molded needle hub and safety needle cover is not lowered.
By adjusting the length of the axial displacement G1, the mating pretension of the friction damping structure can be adjusted, thereby adjusting the rotational torque to M Rotary screw <M≤(M Pain relieving medicine -c) with a crisp snap-jump to prompt the rotator to adjust several ribs. Such adjustment is much easier than adjusting the nominal diameter tolerances of the inner ring relief 42 and the outer ring relief 41.
Fig. 9 illustrates another embodiment of embodiment 2. The two ends of the base 20 are opened, the middle part is integrally connected with the luer connecting part 61 through the connecting part 24, the two sides of the connecting part 24 of the base 20 are symmetrically provided with two elastic deformation barrels 21, and a deformation cavity 23 is formed between the base and the needle seat at the two sides of the connecting part 24. In this way, elastic deformation occurs symmetrically on both sides of the connection 24, simultaneously torsion deformation is produced at the proximal and distal ends of the collar, the rotational adjustment of the collar being balanced in the axial direction. The luer connection 61 has an annular stop 64 on its outer surface, with a receiving slot 32 formed between the stop 64 and the lug 63.
The connecting structure of the safety needle cover and the needle seat adopts the following technical means to solve the technical problems that the connecting structure can simultaneously meet ① clamping in, namely permanent clamping, the ② annular sleeve is positioned and connected with the needle seat in a most suitable injection mode, and the rotation adjusting torque M of the ③ annular sleeve relative to the needle seat meets M Rotary screw <M≤(M Pain relieving medicine -c), so that the precision requirement of a concave-convex structure is reduced:
(1) Rotational torque adjustment through elastic deformation portion, deformation cavity and certain wall thickness range
The purpose of adjusting the rotation torque of the concave-convex of the inner ring relative to the concave-convex of the outer ring is achieved by utilizing elastic deformation. The elastic deformation portion 21 forms a distally open deformation cavity 23 with the luer connection portion 61 or the inner taper 25 of the hub 60 through the connection portion 24. And a certain wall thickness range is selected so that the elastic deformation part elastically deforms when the inner convex edge of the concave-convex inner ring passes over the outer convex edge of the concave-convex outer ring, and the whole circle radially inwards contracts by one convex edge height. The rotational torque M is made to satisfy the requirement ③M Rotary screw <M≤(M Pain relieving medicine -c by adjusting the wall thickness of the elastically deformed portion).
(2) The axial movement of the inner cone sleeve generates a radially outward preload force.
When the axial convex ring 16 abuts against the inner annular convex ring 26 and presses the inner annular convex ring 26 into the annular clamping groove 65, the inner conical sleeve 25 is matched with the outer conical surface of the luer connection part, and axial displacement is continued until the reverse buckling elastic sheet 31 abuts against the annular side wall 33 to form reverse buckling, and the force causes the inner conical sleeve to swell, so that the outer annular concave-convex part 41 of the elastic deformation part 21 applies a radially outward pretightening force to the outer annular concave-convex part 42 of the collar 10.
(3) Positioning during pressing in, rotatable adjustment after matching, and positioning change
The elastic back-off 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 along the axial direction, the positioning elastic sheet 51 is one of the back-off elastic sheets 31, and the positioning elastic sheet 51 is abutted against the positioning groove 52 to form press-in positioning during press-in; when the reverse back-off is formed, the press-in positioning is moved axially without the matching relationship, so that the safety needle cover can be adjusted in a rotating way to further change the positioning of the safety needle cover relative to the needle seat, the positioning is flexible, and the adjusting beneficial effect is not influenced.
Compared with the prior art, the connecting structure of the safety needle cover and the needle seat ensures that the elastic deformation part 21 can be contracted inwards relative to the radial direction through the deformation cavity of the opening, thereby controlling the rotation torque of the collar relative to the needle seat in a proper range; meanwhile, due to the elastic deformation of the elastic deformation portion 21, a crisp "snap" is generated to prompt the operator when rotating.
Claims (10)
1. A connection structure of a safety needle shield and a needle hub, the safety needle shield comprising a collar (10) hingedly connected to the needle shield, the needle hub (60) comprising an integrally connected luer connection (61), a lug (63) and a base (20), the collar (10) and the base each comprising a proximal end axially proximal to the lug and an axially opposite distal end, characterized in that it comprises
The base (20) comprises an elastic deformation barrel (21), the outer periphery of the luer connecting part (61) is coaxially and integrally connected with the elastic deformation barrel (21), and a deformation cavity (23) is arranged between the elastic deformation barrel (21) and the luer connecting part (61);
The elastic back-off part (30), the elastic back-off part (30) comprises a plurality of back-off spring pieces (31) arranged at intervals in an inner hole at the proximal end of the shaft collar (10) and a containing groove (34) arranged at the proximal end of the base (20), the free end of the back-off spring pieces forms a clamping ring to be abutted against the annular side wall (33) of the containing groove (34) to form back-off, so that the shaft collar (10) can not be pulled out of the needle seat (60) along the reverse direction of the pressing-in direction;
a rotation adjustment unit (40) that includes an outer ring concave-convex (41) provided on the outer peripheral surface of the elastic deformation tube (21) and an inner ring concave-convex (42) provided in the inner hole of the collar (10), the inner ring concave-convex (42) being engaged with the outer ring concave-convex (41) to form a friction damping structure;
the elastic back-off part (30) and the rotation adjusting part (40) are sequentially arranged from the proximal end to the distal end along the axial direction.
2. A safety needle shield and hub connection arrangement according to claim 1, wherein the base (20) comprises a positioning barrel (22), and wherein the proximal end of the base (20) is integrally connected to the hub (60) via a connection (24) such that the deformation chamber (23) is open axially distally.
3. The connecting structure of the safety needle cover and the needle seat according to claim 1, wherein the base (20) comprises an inner taper sleeve (25), the inner taper sleeve (25) is coaxially arranged in the elastic deformation barrel (21) and integrally connected with the elastic deformation barrel (21) through a connecting part (24), the outer circumference of the elastic deformation barrel (21) is provided with the outer ring concave-convex (41), and the connecting part (24) enables a deformation cavity (23) to be formed between the inner taper sleeve (25) and the elastic deformation barrel (21); the base (20) is fitted to the outer periphery of the luer connection part (61) through an inner taper sleeve (25).
4. A connection structure of a safety needle cover and a needle seat according to claim 3, characterized in that the distal end of the inner cone sleeve (25) is provided with an inner ring bulge (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 bulge ring (16) towards the proximal end; the far end of the luer connection part (61) is provided with an annular clamping groove (65), and the inner annular bulge (26) is matched with the annular clamping groove (65).
5. The connecting structure of the safety needle cover and the needle seat according to claim 4, wherein the inner cone sleeve (25) of the base (20) is sleeved on the outer cone surface of the luer connecting part (61), the collar (10) is pressed into the base (20) along the axial direction until the axial convex ring (16) is pressed against the inner cone convex ring (26) and is pressed and clamped into the annular clamping groove (65), at the moment, the inner cone hole of the inner cone sleeve (25) is contacted and matched with the outer cone surface of the luer connecting part (61), and the inner cone convex ring (26) has an axial gap G in the annular clamping groove (65); the collar (10) is continuously pressed in the axial direction until the reverse buckling elastic sheet (31) of the collar is abutted against the annular side wall (33) to form reverse buckling, and the axial displacement G1 is reduced by the axial gap G.
6. The structure for connecting a safety needle shield and a needle holder according to any one of claims 1 to 5, further comprising a press-in positioning portion (50), the elastic back-off portion (30), the rotation adjusting portion (40) and the press-in positioning portion (50) being disposed in this order from a proximal end to a distal end in an axial direction; when the reverse undercut is formed, the positioning engagement of the collar (10) relative to the hub (60) is effected only by the rotation adjustment portion (40).
7. The structure for connecting the safety needle cover and the needle holder according to claim 6, wherein the press-in positioning part (50) comprises a positioning spring piece (51) arranged at the proximal end of the collar (10) and a positioning groove (52) arranged at the distal end of the base (20), the positioning spring piece (51) is one of the back-off spring pieces (31), and when the elastic back-off part is pressed in the axial direction, the positioning spring piece (51) is matched with the positioning groove (52) to form circumferential positioning of the safety needle cover relative to the needle holder injection needle.
8. The connecting structure of the safety needle cover and the needle seat according to any one of claims 1 to 5, wherein the collar (10) is sequentially provided with a back-off part (11), an avoidance part (12) and a damping part (13) from the proximal end to the distal end, the periphery of the collar is provided with a hand holding clamping part (14), a plurality of back-off windows (32) are annularly arranged at intervals on the periphery of the back-off part (11), back-off spring pieces (31) are arranged in the back-off windows (32), the fixed ends of the back-off spring pieces (31) are integrally connected with the collar wall at the proximal end, the free ends of the back-off spring pieces (31) are far away from the proximal end, the free ends extend radially inwards relative to the fixed ends, and all the free ends form a butt circle, and the diameter of the butt circle is smaller than the aperture of the damping part (12) by 3 to 5mm.
9. A safety needle shield and hub connection according to any of claims 1-5, wherein the inner ring relief (42) and the outer ring relief (41) are each molded with friction surfaces (43) for increasing friction, the wall thickness S of the resiliently deformable cylinder (21) being 0.5mm +.1.2 mm, such that when all inner ribs of the collar (10) pass over all outer ribs of the base (20), the resiliently deformable cylinder (21) is caused to shrink inwardly in an annular manner and to generate a 'snap' in order to alert the operator.
10. A structure for connecting a safety needle shield and a needle holder as claimed in claim 2 or 3, wherein the base (20) is provided with openings at both ends, the base (20) is symmetrically provided with two elastic deformation barrels (21) at both sides of the connecting portion (24), outer ring concave-convex portions (41) are respectively provided at the outer circumferences of the two elastic deformation barrels (21), and open deformation cavities (23) are respectively provided at both sides of the connecting portion (24).
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 |
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| Publication Number | Publication Date |
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| CN115054781A CN115054781A (en) | 2022-09-16 |
| CN115054781B true 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 |
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| Country | Link |
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| CN (1) | CN115054781B (en) |
| DE (1) | DE202023100848U1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE202023100848U1 (en) | 2023-03-09 |
| CN115054781A (en) | 2022-09-16 |
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