CN107638183B - Fluid delivery device with retractable needle - Google Patents
Fluid delivery device with retractable needle Download PDFInfo
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- CN107638183B CN107638183B CN201711036430.9A CN201711036430A CN107638183B CN 107638183 B CN107638183 B CN 107638183B CN 201711036430 A CN201711036430 A CN 201711036430A CN 107638183 B CN107638183 B CN 107638183B
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- needle
- sleeve
- lock catch
- groove
- cavity
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- 239000012530 fluid Substances 0.000 title claims abstract description 52
- 230000005489 elastic deformation Effects 0.000 claims abstract description 25
- 238000001125 extrusion Methods 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 claims description 14
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 20
- 230000002265 prevention Effects 0.000 abstract description 6
- 239000008280 blood Substances 0.000 description 9
- 210000004369 blood Anatomy 0.000 description 9
- 210000001503 joint Anatomy 0.000 description 6
- 230000004308 accommodation Effects 0.000 description 5
- 239000003814 drug Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000003405 preventing effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010241 blood sampling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
Abstract
The present invention provides a fluid delivery device having a retractable needle, comprising: a needle; the needle sleeve comprises a sleeve body and a containing cavity formed in the sleeve body, the needle is movably retracted into the containing cavity, one end of the containing cavity is provided with an extending port for the needle to extend out, and one end of the sleeve body, which is opposite to the needle, is an elastic deformation end; the locking sleeve is provided with a mounting cavity which extends along the axial direction and can accommodate the needle sleeve, and the cavity wall of the mounting cavity is provided with a first lock catch; the elastic deformation end is provided with a second lock catch corresponding to the first lock catch, and the second lock catch and the first lock catch form a lock catch structure after the elastic deformation end of the needle sleeve is inserted into the installation cavity of the locking sleeve through elastic extrusion. The elastic deformation end of the extrusion needle sleeve enables the needle sleeve to smoothly enter the locking sleeve during installation, the second lock catch can outwards spring to form a lock catch structure in cooperation with the first lock catch after the needle sleeve enters the locking sleeve, the needle sleeve is locked and can not move, the needling prevention effect is reliable, and the needle head can not be reused after retraction.
Description
Technical Field
The invention relates to the technical field of medical appliances, in particular to a fluid conveying device with a retractable needle.
Background
The traditional needle group for inputting liquid medicine into a human body or taking blood generally has no anti-needling function, after the needle is used, the needle point is exposed outside, medical staff or other related staff are easily stabbed, meanwhile, various pollutants such as liquid medicine, human tissues, microorganisms and the like remain on the needle head, and the pollutants are easily spread into the air under the condition of no isolation measures, so that the environment is endangered. In addition, in order to be healthy and sanitary, the needle set for inputting liquid medicine or taking blood into a human body is generally used once and is prevented from being used secondarily, and if the needle cap is sleeved on the needle tip after the needle set is used, the problem that the needle tip is exposed can be solved, but the needle set is likely to be used secondarily, and meanwhile, the needle cap is also easy to fall off and lost, so that the problem of needle penetration prevention still cannot be fundamentally solved.
The patent document with the publication number of CN205885894U discloses a safety needle group, which comprises a connecting seat, a needle fixing ring, a clamping lower seat, a clamping upper seat and a sheath, wherein the needle fixing ring is provided with a needle head, the clamping upper seat and the clamping lower seat are matched into a whole, the sheath is sleeved outside the needle fixing ring and clamped between the clamping upper seat and the clamping lower seat, a clamping convex block is arranged on the sheath corresponding to a groove rail, the clamping convex block can penetrate out of the groove rail from inside to outside, the width of the groove rail at the position communicated with the embedding groove is gradually reduced and symmetrical limiting convex blocks are arranged, when the needle head is pushed out of the sheath after use, the clamping convex block on the needle head enters the embedding groove and is positioned by the limiting convex blocks to prevent the clamping convex block from exiting the embedding groove, and the needle head is sleeved in the sheath, and at the moment, if the sheath is pushed out, the sheath cannot be pulled out of the embedding groove due to the blocking of the limiting convex blocks, so that the needle head is prevented from extending out of the sheath and exposing outside.
The safety needle group disclosed in the above patent document has the function of preventing needling, but the butt joint of the two parts of the upper clamping seat and the lower clamping seat is realized by the butt joint of the two parts of the upper clamping seat and the lower clamping seat, the long perforation is formed by the butt joint of the two parts of the long perforation and the long perforation is formed by the butt joint of the long perforation and the high clamping barb; however, the upper and lower engaging portions can be designed to be relatively small due to the influence of the product structure, and the structure of the polymer material is easy to deform, so that the lower engaging portion is easy to separate from the upper engaging portion; similarly, the clamping barb and the slot wall of the long perforation are both thinner and easier to deform, and the clamping barb is easier to separate from the long perforation, so that the butt joint between the clamping upper seat and the clamping lower seat in the safety needle group is unstable and easy to separate, and once the butt joint between the clamping upper seat and the clamping lower seat is loose, the clamping convex block of the sheath can be easily separated from the embedding block slot of the clamping upper seat, and therefore the sheath extends out, so that the safety needle group loses the anti-needling effect.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the needle assembly in the prior art is unreliable in anti-needling effect, is easy to lose the anti-needling effect and cannot be guaranteed to be used only once, so that the fluid conveying device with the retractable needle, which is reliable in anti-needling effect and cannot be reused after the needle is retracted, is provided.
To solve the above-mentioned technical problem, the present invention provides a fluid delivery device with a retractable needle, comprising:
a needle;
the needle sleeve comprises a sleeve body and a containing cavity formed in the sleeve body, the needle head is movably retracted into the containing cavity, one end of the containing cavity is provided with an extending opening for the needle head to extend out, and one end of the sleeve body, which is opposite to the needle head, is an elastic deformation end;
the locking sleeve is provided with a mounting cavity which extends along the axial direction and can accommodate the needle sleeve, and a first lock catch is arranged on the cavity wall of the mounting cavity;
the elastic deformation end is provided with a second lock catch corresponding to the first lock catch, and the second lock catch forms a lock catch structure with the first lock catch after being inserted into the installation cavity of the locking sleeve through elastic extrusion at the elastic deformation end of the needle sleeve.
The axial limiting structure is used for locking the relative positions of the needle head and the needle sleeve when the needle head is completely retracted into the accommodating cavity.
The first lock catch is a protrusion or a groove arranged on the cavity wall of the mounting cavity;
the second lock catch is a groove or a protrusion which extends outwards from the outer wall of the accommodating cavity and is matched with a protrusion or a groove on the cavity wall of the mounting cavity so as to prevent the needle sleeve and the locking sleeve from axially and relatively moving.
The cavity wall of the accommodating cavity is provided with a first through groove and a second through groove which extend along the axial direction respectively at the corresponding positions of the second lock catch along the circumferential direction; the first through groove and the second through groove divide the sleeve body into a first elastic arm and a second elastic arm, the first elastic arm and the second elastic arm form the elastic deformation end, and the second lock catch is arranged on the first elastic arm and/or the second elastic arm.
The first through groove and the second through groove extend from one end face, far away from the extending port, of the sleeve body to one end, close to the extending port, of the sleeve body.
The second through groove is arranged at one end part of the sleeve body, which is far away from the extending opening.
The needle head is mounted on a needle mounting structure of the fluid delivery device having a retractable needle, the needle mounting structure comprising:
the needle connecting structure is fixedly connected with one end of the needle head, which is far away from the needle point, in a communicating manner;
the needle holding structure can slide back and forth in the first through groove and comprises a connecting arm fixedly connected with the needle connecting structure and extending out of the first through groove and a needle holding handle fixedly connected with the connecting arm and extending out of the first through groove.
The needle holding handle extends on the connecting arm towards the direction of the needle tip.
The included angle between the outer wall of the connecting arm, which is close to the needle head, and the outer wall of the needle holding handle, which is close to the connecting arm, is 30-150 degrees, or the connecting arm is arranged close to the outer wall of the needle head in an arc mode.
The needle connecting structure is a needle seat, and one end of the needle seat, which is far away from the needle head, is communicated with the fluid conveying pipe.
The needle connection structure is a fluid delivery tube.
The axial limiting structure comprises a first stop block which is arranged on the wall of the first through groove and used for stopping the needle holding structure from moving towards the extending opening relative to the needle sleeve when the needle head is completely retracted into the accommodating cavity.
The locking sleeve is sleeved at one end of the needle sleeve, which is far away from the extending port, through the matching of the first lock catch and the second lock catch, and the end face of one end, which is close to the extending port, abuts against one end, which is far away from the extending port, of the needle holding structure when the needle head is completely retracted into the accommodating cavity.
An opening part communicated with the mounting cavity is formed at one end of the locking sleeve close to the extending opening, and the opening part is suitable for mounting the needle sleeve, the needle head and the needle mounting structure; the pore wall of the mounting cavity is formed with an accommodating groove which extends along the axial direction and can accommodate the needle holding structure at one end close to the opening part, the axial limiting structure comprises a blocking arm which is arranged on the groove wall of the accommodating groove close to one end of the opening part and blocks the needle holding structure from being separated from the accommodating groove, and when the needle holding structure is accommodated in the accommodating groove and the second lock catch is blocked into the first lock catch, the needle head is completely accommodated in the accommodating cavity.
One end of the baffle arm, which is close to the opening part, is provided with a guide inclined surface which is inclined towards the center direction of the groove.
The groove wall of the first through groove is provided with a second stop block for stopping the needle holding structure from moving relative to the needle sleeve in a direction away from the extending opening when the needle head is completely retracted into the accommodating cavity.
The needle sleeve is characterized in that a pushing part suitable for applying external force is arranged at one end of the needle sleeve, which is close to the extending opening, a clamping block is formed on the pushing part, and a notch matched with the clamping block is formed at the corresponding position of one end of the locking sleeve, which is close to the opening.
The technical scheme of the invention has the following advantages:
1. according to the fluid conveying device with the retractable needle, the elastic deformation end of the needle sleeve is extruded to enable the needle sleeve to smoothly enter the locking sleeve during installation, after the needle sleeve enters the locking sleeve, the elastic deformation end has a tendency of recovering deformation under the action of self-recovery elastic force, so that the second lock catch on the elastic deformation end can be outwards sprung to be matched with the first lock catch on the installation cavity of the locking sleeve to form a lock catch structure, after blood sampling or transfusion and blood transfusion are completed, the needle sleeve is moved, and after the needle is completely retracted into the accommodating cavity of the needle sleeve, the needle sleeve is locked and cannot move due to the lock catch structure, the needle is completely located in the needle sleeve, the anti-needling effect is reliable, and the needle cannot be reused after retraction.
2. The fluid conveying device with the retractable needle provided by the invention further comprises an axial limiting structure for locking the relative positions of the needle head and the needle sleeve when the needle head is completely retracted into the accommodating cavity, so that the needle head can be prevented from moving towards the extending opening direction in the needle sleeve when the needle head is subjected to external force, the needle head can extend out of the needle sleeve, and the anti-needling effect of the fluid conveying device is more reliable.
3. The fluid conveying device with the retractable needle provided by the invention has the advantages that the first through groove and the second through groove which extend along the axial direction respectively are formed in the corresponding position of the second lock catch on the cavity wall of the accommodating cavity along the circumferential direction; the first through groove and the second through groove divide the sleeve body into a first elastic arm and a second elastic arm, the first elastic arm and the second elastic arm form the elastic deformation end, and the second lock catch is arranged on the first elastic arm and/or the second elastic arm. Through setting up first logical groove and second logical groove, extrusion first elastic arm and second elastic arm when the installation, first elastic arm and second elastic arm take place to warp, make the slot width in first logical groove and second logical groove reduces simultaneously, can make the second hasp can be pressed into in the installation cavity, and when the second hasp arrives first hasp position department, first elastic arm and second elastic arm have the trend of resume deformation under self resilience force, make the second hasp can outwards spring open the card and go into in the first hasp. Therefore, the needle sleeve is locked and cannot move, the needle after the needle sleeve is used is completely positioned in the needle sleeve, the anti-needling effect is more reliable, and the needle cannot be reused after the needle sleeve is retracted.
4. According to the fluid conveying device with the retractable needle, the first through groove and the second through groove extend from the end face, far away from the extending opening, of the sleeve body to the end, close to the extending opening, of the sleeve body respectively, the first through groove and the second through groove are arranged at the free end of the needle sleeve, elastic deformation is easy to occur when the needle sleeve is extruded, and the needle sleeve can conveniently enter the locking sleeve.
5. According to the fluid conveying device with the retractable needle, the second through groove is formed in the end portion, away from the extending opening, of the sleeve body, and the length of the second through groove is short, so that the first elastic arm and the second elastic arm can deform to a certain extent, and can keep enough rigidity, and meanwhile the condition that the needle sleeve can enter the locking sleeve is met, the second lock catch which forms a lock catch structure with the first lock catch is less prone to being separated relative to the first lock catch, the needle sleeve is locked and cannot move, and the needle after the needle is used is completely located in the needle sleeve and is more prone to being separated from the needle sleeve.
6. According to the fluid conveying device with the retractable needle, the needle holding handle extends to the direction of the needle point on the connecting arm, so that the needle holding handle is close to the needle point, and the needle is convenient to control.
7. The axial limiting structure comprises the first stop block which is arranged on the wall of the first through groove and stops the needle holding structure from moving towards the extending opening relative to the needle sleeve when the needle head is completely retracted into the accommodating cavity, so that the needle head can be prevented from moving towards the extending opening under the condition of external force when the needle head is completely retracted into the accommodating cavity, the anti-needling effect of the fluid conveying device is more reliable, the structure is simple, and the fluid conveying device is convenient to process and manufacture.
8. According to the fluid conveying device with the retractable needle, the locking sleeve is sleeved at one end, far away from the extending opening, of the needle sleeve through the matching of the first lock catch and the second lock catch, the structure is simple, the locking sleeve and the needle sleeve are convenient to install, and the end face, close to the extending opening, of the locking sleeve abuts against one end, far away from the extending opening, of the needle holding structure when the needle head is completely retracted into the accommodating cavity. The arrangement can prevent the needle from moving towards the direction far away from the extension port, so that the needling prevention effect is more reliable.
9. The invention provides a fluid delivery device with a retractable needle, wherein an opening part communicated with a mounting cavity is formed at one end of a locking sleeve close to an extension opening, and the opening part is suitable for mounting the needle sleeve, the needle head and the needle mounting structure; the pore wall of the mounting cavity is formed with an accommodating groove which extends along the axial direction and can accommodate the needle holding structure at one end close to the opening part, the axial limiting structure comprises a blocking arm which is arranged on the groove wall of the accommodating groove close to one end of the opening part and blocks the needle holding structure from being separated from the accommodating groove, and when the needle holding structure is accommodated in the accommodating groove and the second lock catch is blocked into the first lock catch, the needle head is completely accommodated in the accommodating cavity. When the needle is completely accommodated in the accommodating cavity, the blocking arm limits the axial movement of the needle and the locking sleeve, when the second lock catch is clamped in the first lock catch, the relative position of the needle sleeve and the locking sleeve is locked, and the relative position of the needle and the needle sleeve is finally locked through the arrangement of the locking sleeve as an intermediate piece structure, so that the fluid conveying device is compact in structure and reliable in needling prevention effect.
10. According to the fluid conveying device with the retractable needle, the guide inclined surface inclined towards the center direction of the groove is formed at one end, close to the opening, of the blocking arm, so that the needle mounting structure can smoothly enter the accommodating groove and cannot easily escape from the accommodating groove.
11. According to the fluid conveying device with the retractable needle, the second stop block which is used for stopping the needle holding structure from moving relative to the needle sleeve in the direction away from the extending opening when the needle head is completely retracted into the accommodating cavity is arranged on the groove wall of the first through groove, so that the needle head is prevented from being exposed due to the fact that the needle sleeve is separated from the locking sleeve under the condition that the needle sleeve is subjected to a larger external force in the extending opening direction, and the needle penetration preventing effect is more reliable.
12. According to the fluid conveying device with the retractable needle, the pushing part which is suitable for applying external force is arranged at one end of the needle sleeve, which is close to the extending opening, the clamping block is formed on the pushing part, and the notch matched with the clamping block is formed at the corresponding position of one end of the locking sleeve, which is close to the opening, so that the needle sleeve can be pushed conveniently.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view showing the structure of a needle hub provided in embodiment 1 of the present invention;
FIG. 2 is a schematic view showing the structure of a locking sleeve provided in embodiment 1 of the present invention;
FIG. 3 is an isometric view of the locking sleeve shown in FIG. 2;
FIG. 4 is a cross-sectional view of the locking sleeve shown in FIG. 2;
FIG. 5 is a schematic view showing the structure of the needle head according to embodiment 1 of the present invention mounted on the needle mounting structure;
FIG. 6 is a schematic view of a fluid delivery device with a retractable needle according to embodiment 1 of the present invention;
FIG. 7 is a schematic view of a needle hub according to embodiment 2 of the present invention;
FIG. 8 is a schematic structural view of a locking sleeve according to embodiment 2 of the present invention;
FIG. 9 is a schematic view showing the structure of a needle head and a needle cover of a fluid transport device with a retractable needle according to embodiment 2 of the present invention before installation;
FIG. 10 is a schematic view of the needle of FIG. 9 after being installed into a needle hub and prior to installation with a locking hub;
FIG. 11 is a schematic view showing the structure of a fluid transport device with a retractable needle according to embodiment 2 of the present invention after the assembly is completed;
fig. 12 is a schematic view of the fluid delivery device with retractable needle of fig. 11 after use.
Fig. 13 is a schematic view of another embodiment of the needle head of fig. 5 mounted to a needle mounting structure.
Reference numerals illustrate:
1-a needle; 2-a needle sleeve; 3-locking sleeve;
11-a needle stand; 12-holding a needle handle; 13-a connecting arm;
21-a first through groove; 22-a second through slot; 23-a second lock catch;
24-a first stop; 25-a second stop; 26-pushing part;
31-a first latch; 32-receiving slots.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
As shown in fig. 1-6, the present embodiment provides a fluid delivery device with a retractable needle comprising a needle 1, a needle hub 2, a locking hub 3 and an axial stop.
The needle sleeve 2 comprises a sleeve body and a containing cavity formed in the sleeve body, the needle head 1 is movably retracted into the containing cavity, one end of the containing cavity is provided with an extending opening for the needle head 1 to extend out, and one end of the sleeve body, which is away from the needle head 1, is an elastic deformation end.
The locking sleeve 3 is provided with a mounting cavity which extends along the axial direction and can accommodate the needle sleeve 2, and the cavity wall of the mounting cavity is provided with a first lock catch 31; the elastic deformation end is provided with a second lock catch 23 corresponding to the first lock catch 31, and the second lock catch 23 forms a lock catch structure with the first lock catch 31 after being inserted into the installation cavity of the locking sleeve 3 through elastic extrusion at the elastic deformation end of the needle sleeve 2.
During installation, the needle sleeve smoothly enters the locking sleeve by extruding the elastic deformation end of the needle sleeve 2, after the needle sleeve enters the locking sleeve, the elastic deformation end has a tendency of recovering deformation under the action of self recovery elastic force, so that a second lock catch on the elastic deformation end can outwards spring to form a lock catch structure in cooperation with a first lock catch on the installation cavity on the locking sleeve, after blood collection or transfusion and blood transfusion are completed, the needle sleeve 2 is moved, the needle head 1 is completely retracted into the accommodating cavity of the needle sleeve 2, the needle sleeve 2 is locked and cannot be moved due to the lock catch structure, the needle head 1 is completely positioned inside the needle sleeve 2, the anti-needling effect is reliable, and the needle head 1 cannot be reused after retraction.
The first lock catch 31 is a protrusion or a groove arranged on the cavity wall of the mounting cavity; the second lock catch 23 is a groove or a protrusion extending outwards from the outer wall of the accommodating cavity and matched with a protrusion or a groove on the cavity wall of the mounting cavity to prevent the needle sleeve 2 and the locking sleeve 3 from axially moving relatively. In this embodiment, as shown in fig. 2-4, the first lock catch 31 is a groove provided on the mounting cavity, and as shown in fig. 1, the second lock catch 23 is a protrusion provided on the outer wall of the accommodating cavity.
In this embodiment, the needle sheath 2 needs to be extruded and inserted into the installation cavity of the locking sheath 3, and the second lock catch 23 can be snapped into the first lock catch 31 when being sprung outwards, so the needle sheath 2 needs to have reliable elastic force, and in order to ensure that the needle sheath 2 has reliable elastic force, the cavity wall of the accommodating cavity is provided with a first through groove 21 and a second through groove 22 which respectively extend along the axial direction at corresponding positions of the second lock catch 23 along the circumferential direction; the first through groove and the second through groove divide the sleeve body into a first elastic arm and a second elastic arm, the first elastic arm and the second elastic arm form the elastic deformation end, and the second lock catch is arranged on the first elastic arm and/or the second elastic arm. Through setting up first logical groove 21 and second logical groove 22, extrusion first elastic arm and second elastic arm when the installation, first elastic arm and second elastic arm take place to warp, make the slot width in first logical groove 21 and second logical groove 22 reduces simultaneously, can make second hasp 23 can be pressed in the installation cavity, and when second hasp 23 reaches first hasp 31 position department, first elastic arm and second elastic arm have the trend of resume deformation under self resilience force, make second hasp 23 can outwards spring open the card and go into in the first hasp 31. Therefore, the needle sleeve is locked and cannot move, the needle after the needle sleeve is used is completely positioned in the needle sleeve, the anti-needling effect is more reliable, and the needle cannot be reused after the needle sleeve is retracted. When the length of the second through groove 22 is too large, the rigidity of the needle sleeve 2 is affected, deformation is easy to occur, so in this embodiment, the second through groove 22 is arranged at the end part of the sleeve body away from the extending opening, so that the first elastic arm and the second elastic arm can deform to a certain extent, and can maintain sufficient rigidity, and the second lock catch after the lock catch structure is formed with the first lock catch is less likely to be separated from the first lock catch when the needle sleeve can enter the locking sleeve, so that the needle sleeve is locked and is not likely to move, and the needle after the needle is used is completely positioned in the needle sleeve and is less likely to be separated from the needle sleeve. And the first through groove and the second through groove are arranged at the free end of the needle sleeve, so that the needle sleeve is easier to elastically deform when being extruded, and the needle sleeve is more convenient to enter the locking sleeve. As an alternative embodiment, the first through groove 21 and the second through groove 22 respectively extend from an end face of the sleeve body far from the extending port to an end close to the extending port, so that the first through groove 21 and the second through groove 22 have a larger length, and the needle sleeve 2 has a reliable elastic force.
As an alternative embodiment, the second through slot 22 is provided at a middle section of the needle sheath 2 at a position corresponding to the second lock catch 23.
In the present embodiment, the needle 1 is mounted on a needle mounting structure of the fluid delivery device having a retractable needle, the needle mounting structure comprising: the needle connecting structure is fixedly connected with one end of the needle head, which is far away from the needle point, in a communicating manner; the needle holding structure can slide back and forth in the first through groove 21 and comprises a connecting arm fixedly connected with the needle connecting structure and extending out of the first through groove 21, and a needle holding handle 12 fixedly connected with the connecting arm and extending out of the first through groove. As shown in fig. 5, the needle holding handle extends towards the direction of the needle point on the connecting arm, so that the needle holding handle is closer to the needle point, and the needle is convenient to control. In this embodiment, the included angle between the outer wall of the connecting arm near the needle head and the outer wall of the needle holding handle near the connecting arm is 30 ° to 150 °. In a variant embodiment, as shown in fig. 13, the connecting arm is arranged in a circular arc near the outer wall of the needle. Specifically, as shown in fig. 7, the needle connecting structure is a needle seat 11, and an end of the needle seat 11 away from the needle 1 is communicated with a fluid delivery tube.
In this embodiment, when the needle 1 is completely retracted into the accommodating cavity, in order to prevent the needle 1 from moving toward the protruding opening direction in the needle sheath 2 when the needle 1 is subjected to an external force, the needle sheath 2 is protruded, so that the needle penetration preventing effect is affected, and as shown in fig. 2, the locking sheath 3 is formed with an opening communicating with the mounting cavity at one end near the protruding opening, the opening being adapted for mounting the needle sheath 2, the needle 1 and the needle mounting structure; the pore wall of the installation cavity is formed with an accommodation groove 32 which extends along the axial direction and can accommodate the needle holding structure at one end close to the opening part, the axial limiting structure comprises a blocking arm which is arranged on the groove wall of the accommodation groove 32 at one end close to the opening part and blocks the needle holding structure from being separated from the accommodation groove 32, and when the needle holding structure is accommodated in the accommodation groove 32 and the second lock catch 23 is blocked into the first lock catch 31, the needle head 1 is completely accommodated in the accommodation cavity. When the needle is completely accommodated in the accommodating cavity, the blocking arm limits the axial movement of the needle and the locking sleeve, when the second lock catch is clamped in the first lock catch, the relative position of the needle sleeve and the locking sleeve is locked, and the relative position of the needle and the needle sleeve is finally locked through the arrangement of the locking sleeve as an intermediate piece structure, so that the fluid conveying device is compact in structure and reliable in needling prevention effect.
In order to facilitate the smooth entry of the needle mounting structure into the accommodating groove 32, a guide slope inclined toward the groove center direction is formed at one end of the blocking arm near the opening portion, as shown in fig. 2, and this arrangement also makes the needle mounting structure not easily escape from the accommodating groove 32.
When the needle 1 is completely retracted into the accommodating cavity, the needle holding structure is located in the accommodating groove 32 and cannot move towards the extending opening, and if a force towards the extending opening is applied to the needle sleeve 2, the needle sleeve 2 can be separated from the locking sleeve 3, so that the needle 1 is exposed to influence the anti-needling effect, and in order to ensure the reliability of the anti-needling effect, as shown in fig. 1, a second stop block 25 for blocking the needle holding structure from moving towards the direction away from the extending opening relative to the needle sleeve 2 when the needle 1 is completely retracted into the accommodating cavity is arranged on the groove wall of the first through groove 21.
In an improved embodiment, for facilitating pushing the needle sleeve 2, a pushing portion 26 adapted to apply an external force is provided at one end of the needle sleeve 2 near the protruding opening, a clamping block is formed on the pushing portion, and a notch matched with the clamping block is formed at a corresponding position of one end of the locking sleeve 3 near the opening.
In the specific installation, firstly, the needle installation structure comprising the needle seat 11 and the needle holding structure of the needle head 1 is installed in the accommodating cavity of the needle sleeve 2 from one end of the needle sleeve 2 far away from the extending port and pushed to one end of the first through groove 21 close to the extending port, then the needle sleeve 2 is installed in the installation cavity of the locking sleeve 3 from the opening part, the position of the second lock catch 23 is staggered relative to the position of the first lock catch 31 when the needle sleeve 2 enters the installation cavity, the second lock catch 23 is prevented from being blocked in the first lock catch 31, after the second lock catch 23 is positioned on one side of the first lock catch 31 far away from the extending port, the needle sleeve 2 is rotated, the needle holding handle 12 is positioned at the corresponding position of the accommodating groove 32, at the moment, the position of the second lock catch 23 corresponds to the position of the first lock catch 31, then the needle sleeve 2 is pushed continuously until the needle holding structure enters the accommodating groove 32, and the needle head 1 is installed on the needle head 1, and the needle head 1 can be used completely. When blood collection, infusion and blood transfusion are completed, the pushing part 26 is pushed by hand, so that the needle sleeve 2 moves towards the extending opening until the needle head 1 is completely positioned in the accommodating cavity of the needle sleeve 2, at this time, the first lock catch 31 is engaged with the second lock catch 23, the relative position of the needle sleeve 2 and the locking sleeve 3 is locked, and meanwhile, the needle holding structure is positioned in the accommodating groove 32 and cannot move, so that the anti-needling effect is reliable and the needle head 1 cannot be reused after retraction. The needle sleeve 2 can be pressed by hand to keep the needle sleeve 2 motionless, the locking sleeve 3 is pulled by force to enable the locking sleeve 3 to move away from the direction of the extending opening, the locking sleeve 3 drives the needle head 1 to move away from the direction of the extending opening through the containing groove 32 until the needle head 1 is completely retracted into the containing cavity, at the moment, the first lock catch 31 is engaged with the second lock catch 23, and the relative position of the needle sleeve 2 and the locking sleeve 3 is locked.
In an alternative embodiment, the needle connection is a fluid delivery tube, and the needle 1 is mounted directly into the fluid delivery tube.
Example 2
The difference between this embodiment and the above embodiment is that, as shown in fig. 7-9, the axial limiting structure includes a first stop block 24 disposed on the wall of the first through groove 21, and blocking the movement of the needle holding structure relative to the needle hub 2 toward the protruding opening when the needle 1 is completely retracted into the accommodating cavity, so as to prevent the needle from moving toward the protruding opening when the needle is completely retracted into the accommodating cavity under the condition of external force, so that the anti-needling effect of the fluid conveying device is more reliable, and the structure is simple and convenient to manufacture.
In order to facilitate the installation of the locking sleeve and the needle sleeve, the locking sleeve 3 is sleeved at one end of the needle sleeve 2 far away from the extending port through the matching of the first lock catch 31 and the second lock catch 23, and the end face of one end, which is close to the extending port, is propped against one end, which is far away from the extending port, of the needle holding structure when the needle head 1 is completely retracted into the accommodating cavity. The arrangement can prevent the needle from moving towards the direction far away from the extension port, so that the needling prevention effect is more reliable.
In specific use, as shown in fig. 9-12, when in installation, firstly, the needle installation structure of the needle 1 which is already installed and comprises the needle seat 11 and the needle holding structure is installed in the accommodating cavity of the needle sleeve 2 from one end of the needle sleeve 2 far away from the extending opening, the position of the needle seat 11 is positioned at one side of the first stop block 24 close to the extending opening, then the locking sleeve 3 is sleeved on the elastic deformation end of the needle sleeve 2, the first lock catch 31 on the locking sleeve 3 and the second lock catch 23 on the needle sleeve 2 form a lock catch structure, so that the relative position of the locking sleeve 3 and the needle sleeve 2 can not move, the needle seat 11 is pushed to the end part of the first through groove 21 close to the extending opening, and the needle 1 is covered with a needle cap, thus the needle 1 can be used. When blood collection, infusion and blood transfusion are completed, one hand holds the needle holding handle 12, the needle holding handle 12 is pushed to move away from the extending port until the needle holding handle 12 moves to the other side of the first stop block 24, at this time, the needle head 1 is completely retracted into the accommodating cavity, one end face of the locking sleeve 3, which is close to the extending port, abuts against one end, which is away from the extending port, of the needle holding handle 12, the needle head 1 cannot move towards the extending port or away from the extending port, the anti-needling effect is reliable, and the needle head 1 cannot be reused after retraction.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (14)
1. A fluid delivery device having a retractable needle, comprising:
a needle (1);
the needle sleeve (2) comprises a sleeve body and a containing cavity formed in the sleeve body, the needle (1) is movably retracted into the containing cavity, one end of the containing cavity is provided with an extending port for the needle (1) to extend out, and one end of the sleeve body, which is opposite to the needle (1), is an elastic deformation end;
the locking sleeve (3) is provided with a mounting cavity which extends along the axial direction and can accommodate the needle sleeve (2), a first lock catch (31) is arranged on the cavity wall of the mounting cavity, and an accommodating groove (32) is arranged on the outer wall of the mounting cavity;
a second lock catch (23) corresponding to the first lock catch (31) is arranged on the elastic deformation end, the second lock catch (23) is inserted into the mounting cavity of the locking sleeve (3) through elastic extrusion at the elastic deformation end of the needle sleeve (2) to form a lock catch structure with the first lock catch (31), a first through groove (21) and a second through groove (22) which extend along the axial direction respectively are formed in the corresponding position of the second lock catch (23) along the circumferential direction of the cavity wall of the accommodating cavity, the first through groove (21) and the second through groove (22) divide the sleeve body into a first elastic arm and a second elastic arm, the first elastic arm and the second elastic arm form the elastic deformation end, the second lock catch (23) is arranged on the first elastic arm and/or the second elastic arm, and the needle head (1) is slidably arranged on the first through the needle holding structure;
the axial limiting structure comprises a first stop block (24) which is arranged on the groove wall of the first through groove (21) and used for blocking the needle holding structure from moving towards the extending opening relative to the needle sleeve (2) when the needle head (1) is completely retracted into the accommodating cavity, and a blocking arm which is arranged on the accommodating groove (32) and used for blocking the needle holding structure from being separated from the accommodating groove (32).
2. The fluid delivery device with retractable needle of claim 1 wherein,
the first lock catch (31) is a protrusion or a groove arranged on the cavity wall of the mounting cavity;
the second lock catch (23) is a groove or a bulge which extends outwards from the outer wall of the accommodating cavity and is matched with a bulge or a groove on the cavity wall of the mounting cavity so as to prevent the needle sleeve (2) and the locking sleeve (3) from axially and relatively moving.
3. A fluid delivery device with a retractable needle according to claim 1, characterized in that the first through slot (21) and the second through slot (22) extend from the end of the sleeve body facing away from the outlet opening to the end near the outlet opening, respectively.
4. A fluid delivery device with a retractable needle according to claim 3, wherein the second through slot (22) is provided at an end of the sleeve body remote from the protruding port.
5. A fluid delivery device with a retractable needle according to claim 3, characterized in that the needle (1) is mounted on a needle mounting structure of the fluid delivery device with a retractable needle, the needle mounting structure comprising:
the needle connecting structure is fixedly connected with one end of the needle head (1) far away from the needle point in a communicating way;
the needle holding structure comprises a connecting arm (13) fixedly connected with the needle connecting structure and extending out of the first through groove (21), and a needle holding handle (12) fixedly connected with the connecting arm (13) and extending out of the first through groove (21).
6. The fluid delivery device with retractable needle of claim 5, wherein the needle holder extends on the connecting arm in the direction of the needle tip.
7. A fluid delivery device with retractable needle according to claim 6, characterized in that the angle between the outer wall of the connecting arm (13) close to the needle (1) and the outer wall of the needle holder (12) close to the connecting arm is 30 ° to 150 °, or the connecting arm (13) is arranged close to the outer wall arc of the needle (1).
8. A fluid delivery device with a retractable needle according to claim 5, characterized in that the needle connection is a needle hub (11), the end of the needle hub (11) remote from the needle (1) being in communication with a fluid delivery tube.
9. The fluid delivery device with retractable needle of claim 5, wherein the needle connecting structure is a fluid delivery tube.
10. A fluid delivery device with retractable needle according to claim 5, characterized in that the locking sleeve (3) is sleeved at the end of the needle sleeve (2) far from the outlet by the cooperation of the first lock catch (31) and the second lock catch (23), and the end face of the end close to the outlet abuts against the end of the needle holding structure far from the outlet when the needle (1) is completely retracted into the accommodating cavity.
11. A fluid delivery device with a retractable needle according to claim 5, characterized in that the locking sleeve (3) is formed with an opening communicating with the mounting cavity at one end near the protruding opening, the opening being adapted for the insertion of the needle sleeve (2), the needle head (1) and the needle mounting structure; the hole wall of the mounting cavity is formed with an accommodating groove (32) which extends along the axial direction and can accommodate the needle holding structure at one end close to the opening part, and when the needle holding structure is accommodated in the accommodating groove (32) and the second lock catch (23) is clamped into the first lock catch (31), the needle head (1) is completely accommodated in the accommodating cavity.
12. The fluid delivery device with retractable needle according to claim 11, wherein an end of the stopper arm near the opening is formed with a guide slope inclined toward a groove center direction.
13. A fluid delivery device with retractable needle according to claim 1, characterized in that the wall of the first through slot (21) is provided with a second stop (25) for blocking the movement of the needle holding structure relative to the needle hub (2) in a direction away from the protruding opening when the needle (1) is fully retracted into the receiving chamber.
14. The fluid delivery device with retractable needle according to claim 12, wherein a pushing part (26) suitable for applying external force is arranged at one end of the needle sleeve (2) close to the extending port, a clamping block is formed on the pushing part (26), and a notch matched with the clamping block is formed at a corresponding position of one end of the locking sleeve (3) close to the opening part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711036430.9A CN107638183B (en) | 2017-10-30 | 2017-10-30 | Fluid delivery device with retractable needle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711036430.9A CN107638183B (en) | 2017-10-30 | 2017-10-30 | Fluid delivery device with retractable needle |
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| CN107638183A CN107638183A (en) | 2018-01-30 |
| CN107638183B true CN107638183B (en) | 2023-12-26 |
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| CN201711036430.9A Active CN107638183B (en) | 2017-10-30 | 2017-10-30 | Fluid delivery device with retractable needle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116269780B (en) * | 2023-02-23 | 2023-10-10 | 之江实验室 | Feeding mechanism and surgical robot |
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