Special needle anti-puncture structure for implantable drug delivery device
By designing a special needle structure including a needle handle, an anti-puncture tray, a telescopic tube and a needle tube, the problem of preventing liquid on the outer surface of the needle tube from contacting the human body in the prior art is solved, and effective protection and safety improvement in the state of removing the needle is achieved.
Patent Information
- Application Number
- CN202420740264.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-04-11
AI Technical Summary
The existing needles for implantable drug delivery devices cannot effectively prevent the liquid and body fluids brought out of the outer surface of the needle from contacting the human body when the needle is removed, resulting in the risk of secondary infection.
A special needle structure including a needle handle, a stab wound tray, a telescopic tube and a needle tube was designed. In use, the needle tube extends out and passes through the needle tube hole of the anti-puncture tray, and the shrapnel is abutted against the body of the syringe; in the state of removing the needle, the needle tube is withdrawn, the shrapnel is blocked, and the telescopic tube is stretched axially to isolate the liquid brought out from the outer surface of the syringe.
Effectively prevent needles and syringes from stabbing medical staff and causing secondary infections when the needle is removed, improving safety and protective effects.
Smart Images
Figure CN222899881U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to an anti-stabbing structure for a special needle of an implantable drug delivery device. Background Art
[0002] At present, there is a commercially available safety needle, Braun Safety II needle, a special infusion needle for drug delivery used in conjunction with an implantable drug delivery device. To achieve the function of preventing needle stabbing, the needle is restricted inside the anti-stabbing disk in the needle removal state. The needle of this product has a flattened structure design. Flattening the needle will increase the puncture force of the special needle when inserting into the skin and the drug delivery device, and at the same time will affect the infusion flow rate. In the needle removal state, it can only prevent the needle from stabbing the human body, and cannot isolate the contact between the liquid medicine and body fluid brought out by the outer surface of the needle tube and the human body, which is likely to cause secondary infection.
[0003] Another patent for a special implantable drug delivery needle with anti-needle-stabbing function, CN117298376A, is a special infusion needle for drug delivery used in conjunction with an implantable drug delivery device. In the initial state of the special needle, the fixed wing is fixedly connected to the needle, and the fixed wing is connected to the needle seat through the second elastic part. When in use, medical staff pinch the fixed wing, and the needle seat is likely to slide down along the needle under its own weight until the second elastic part is tightened, which will affect the needle insertion by medical staff; at the same time, in the needle removal state, it can only prevent the needle from stabbing the human body, and secondary infection may still occur. Content of the Utility Model
[0004] To achieve the above object, the utility model provides the following technical solutions:
[0005] An anti-stabbing structure for a special needle of an implantable drug delivery device, characterized by comprising:
[0006] A needle handle;
[0007] An anti-stabbing disk, the anti-stabbing disk having a needle tube hole and a spring piece, the spring piece being switchably used to block the needle tube hole;
[0008] A telescopic tube, the telescopic tube having a hollow inner cavity, one end of the telescopic tube being fixedly connected to the needle handle, and the other end being fixedly connected to the anti-stabbing disk;
[0009] A needle tube, one end of the needle tube being fixed in the needle handle, and the other end passing through the telescopic tube and then passing through the needle tube hole of the anti-stabbing disk; wherein,
[0010] In the use state, the needle tube extends out from the needle tube hole at the bottom of the anti-stabbing disk, and the spring piece abuts against the outer tube wall of the needle tube, and the telescopic tube is folded and compressed;
[0011] In the needle extraction state, the syringe barrel retracts from the syringe barrel hole located at the bottom of the anti-stabbing disk, and the elastic piece seals the syringe barrel hole, and the telescopic tube is axially stretched.
[0012] Preferably, the anti-stabbing disk includes an anti-stabbing disk upper cover, an anti-stabbing disk bottom cover, and a chamber located between the anti-stabbing disk upper cover and the anti-stabbing disk bottom cover. The lower end surface of the anti-stabbing disk upper cover is fixedly connected to the upper end surface of the anti-stabbing disk bottom cover. Both the anti-stabbing disk upper cover and the anti-stabbing disk bottom cover are provided with syringe barrel holes. The projection of the syringe barrel hole penetrating the anti-stabbing disk upper cover on the anti-stabbing disk bottom cover overlaps with the position of the syringe barrel hole penetrating the anti-stabbing disk bottom cover. A circular sunk groove is concentrically arranged on the outer periphery of the syringe barrel hole on the upper end surface of the anti-stabbing disk upper cover.
[0013] Preferably, the needle handle is connected with two wings through syringe barrel connecting seats located on both sides thereof. The syringe barrel is sequentially divided into a horizontal section, a bent section, a vertical section, and a needle tip.
[0014] The needle handle includes a cover body and a main body portion fixedly connected to the cover body. A circular connecting groove is provided on the lower side of the cover body. A channel penetrating the cover body and the main body portion fixedly connected to the cover body is provided at the center of the circular connecting groove to fix at least the horizontal section of the syringe barrel.
[0015] Preferably, the thin-walled disks at the upper and lower ends of the telescopic tube are respectively fixedly connected to the needle handle and the anti-stabbing disk through connectors. Among them,
[0016] The connectors include a connector Ⅰ positioned and installed at the upper end of the telescopic tube and a connector Ⅱ positioned and installed at the lower end of the telescopic tube. The connector Ⅰ is fixedly connected to the circular connecting groove below the needle handle. The thin-walled disk at the upper end of the telescopic tube is clamped between the connector Ⅰ and the circular connecting groove below the needle handle. The connector Ⅱ is fixedly connected to the circular sunk groove of the anti-stabbing disk upper cover. The thin-walled disk at the lower end of the telescopic tube is clamped between the connector Ⅱ and the anti-stabbing disk upper cover.
[0017] Preferably, both the connector Ⅰ and the connector Ⅱ have positioning pins, and both the upper and lower ends of the telescopic tube have positioning holes adapted to the positioning pins.
[0018] Preferably, the depth of the circular sunk groove is equal to the sum of the thickness of the connector Ⅱ and the thickness of the thin-walled disk of the connector. The radial dimension of the circular sunk groove is adapted to the radial dimension of the connector Ⅱ, and the thin-walled disk is coaxially assembled with the connector Ⅱ.
[0019] Preferably, the upper end surface of the anti-stabbing disk bottom cover has a non-penetrating special-shaped groove, and the shape and size of the special-shaped groove are adapted to the shape and size of the elastic piece.
[0020] Preferably, the elastic piece includes a retaining piece portion, an elastic section and a limiting section, wherein the elastic section is located on both sides of the end of the retaining piece portion and inclines outward, and the limiting sections are respectively connected to the ends on both sides of the elastic section, and the limiting sections are clamped in the elastic piece limiting grooves of the special-shaped grooves;
[0021] When the syringe passes through the syringe hole of the anti-stabbing disc bottom cover, the retaining piece portion abuts against the syringe body, and the elastic section is in a compressed state;
[0022] When the syringe is withdrawn from the syringe hole of the anti-stabbing disc bottom cover, the syringe is separated from the retaining piece portion, the elastic section returns to its natural state, and the retaining piece portion seals the syringe hole of the anti-stabbing disc bottom cover.
[0023] Preferably, the telescopic tube is a corrugated tube. In the use state, the telescopic tube is in a folded and compressed state; in the needle-pulling state, the telescopic tube is axially stretched into a thin-walled hollow straight tube with an equal diameter.
[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0025] 1. When inserted into the implantable drug delivery device in the use state, the special needle patch is on the patient's body surface. The design of the telescopic tube greatly reduces the height of the special needle protruding from the body surface, reduces the impact on the patient's normal life, and improves the comfort level;
[0026] 2. After the special needle is used up and the implantable drug delivery device and the patient's skin are pulled out, the elastic piece blocks the syringe hole of the anti-stabbing disc bottom cover, and the needle tip is restricted in the inner cavity of the anti-stabbing disc, which can effectively prevent the needle from stabbing medical staff and stabbing the human body during the subsequent recycling process;
[0027] 3. After the special needle is used up and the implantable drug delivery device and the patient's skin are pulled out, the straightened telescopic tube and the anti-stabbing disc can isolate the liquid medicine and body fluid brought out by the outer surface of the syringe from contacting the human body, preventing secondary infection. Description of the Drawings
[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0029] Figure 1 It is a three-dimensional view of the present utility model in the use state.
[0030] Figure 2 For the present utility model Figure 1 The cross-sectional view at A-A in it.
[0031] Figure 3 It is a three-dimensional view of the present utility model in the needle-pulling state.
[0032] Figure 4 For the present utility model Figure 3 is a sectional view taken along line B-B in the present utility model.
[0033] Figure 5 is a structural diagram of the needle handle of the present utility model.
[0034] Figure 6 is a structural diagram of the connecting member Ⅰ or the connecting member Ⅱ of the present utility model.
[0035] Figure 7 is a top view or a bottom view of the telescopic tube of the present utility model.
[0036] Figure 8 is a longitudinal sectional view of the telescopic tube of the present utility model.
[0037] Figure 9 is a structural diagram of the upper cover of the anti-stabbing disc of the present utility model.
[0038] Figure 10 is a structural diagram of the elastic piece of the present utility model.
[0039] Figure 11 is a structural diagram of the bottom cover of the anti-stabbing disc of the present utility model.
[0040] Figure 12 is a structural diagram of the needle tube of the present utility model.
[0041] In the figure: 1 - needle handle, 2 - two wings, 3 - connecting member Ⅰ, 4 - telescopic tube, 5 - connecting member Ⅱ, 6 - upper cover of the anti-stabbing disc, 7 - elastic piece, 8 - bottom cover of the anti-stabbing disc, 9 - needle tube, 10 - thin-walled disc, 11 - circular connecting groove, 12 - positioning pin, 13 - positioning hole, 14 - circular ring-shaped sunk groove, 15 - needle tube hole, 16 - retaining piece part, 17 - two-wing groove, 18 - elastic section, 19 - limiting section, 20 - elastic piece limiting groove, 21 - special-shaped groove, 22 - needle tube connecting seat. Detailed implementation manners
[0042] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.
[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0044] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not require further discussion in subsequent drawings.
[0045] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.
[0046] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations during use or operation in addition to the orientation described in the figure for the device. For example, if the device in the attached drawing is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned or rotated in other different ways, such as by 90 degrees or in other orientations, and corresponding interpretations will be made for the spatial relative descriptions used here.
[0047] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is merely for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.
[0048] Please refer to Figures 1 to 12 , the present utility model provides a technical solution:
[0049] A puncture prevention structure for a special needle of an implantable drug delivery device, comprising:
[0050] A needle handle 1;
[0051] A puncture prevention disk, the puncture prevention disk having a needle tube hole 15 and a shrapnel 7, the shrapnel 7 being switchably used to block the needle tube hole 15;
[0052] A telescopic tube 4, the telescopic tube 4 having a hollow inner cavity, one end of the telescopic tube 4 being fixedly connected to the needle handle 1 and the other end being fixedly connected to the puncture prevention disk;
[0053] A needle tube 9, one end of the needle tube 9 being fixed in the needle handle 1 and the other end passing through the telescopic tube 4 and then passing through the needle tube hole 15 of the puncture prevention disk; wherein,
[0054] In the use state, the needle tube 9 extends out from the needle tube hole 15 at the bottom of the puncture prevention disk, and the shrapnel 7 abuts against the body of the needle tube 9, and the telescopic tube 4 is folded and compressed;
[0055] In the state of withdrawing the needle, the needle tube 9 withdraws from the needle tube hole 15 at the bottom of the puncture prevention disk, and the shrapnel 7 blocks the needle tube hole 15, and the telescopic tube 4 is axially stretched.
[0056] The present utility model relates to the structural design for preventing the tip of a special needle from stabbing the human body and the structural design for preventing the needle tube from contacting the human body in the state of withdrawing the special needle. The anti-stabbing structure is easy to operate and meets the ideal protection requirements.
[0057] In a specific embodiment, the state of the special needle when in use, that is, when inserted into the implantable drug delivery device, is as Figures 1 to 2 shown. The needle tube 9 is connected to the needle handle 1 by a fixing method;
[0058] The connecting member I 3 and the connecting member II 5 are respectively positioned and installed at the upper end and the lower end of the telescopic tube 4;
[0059] The anti-stabbing disc includes an anti-stabbing disc upper cover 6, an anti-stabbing disc bottom cover 8, and a chamber located between the anti-stabbing disc upper cover 6 and the anti-stabbing disc bottom cover 8. The lower end surface of the anti-stabbing disc upper cover 6 is fixedly connected to the upper end surface of the anti-stabbing disc bottom cover 8. Needle tube holes 15 are both provided through the central positions of the anti-stabbing disc upper cover 6 and the anti-stabbing disc bottom cover 8. A circular groove 14 is concentrically provided on the outer periphery of the needle tube hole 15 on the outside of the anti-stabbing disc upper cover 6; The needle tube 9 is coaxial with the connecting member I 3, the telescopic tube 4, the connecting member II 5, the anti-stabbing disc upper cover 6, and the anti-stabbing disc bottom cover 8; The depth of the circular groove 14 is equal to the thickness of the connecting member II 5 plus the thickness of the thin-walled disc 10 of the connecting member. The diameter is adapted to the outer diameter of the ring of the connecting member II 5. The diameter of the thin-walled disc 10 is the same as the diameter of the anti-stabbing disc bottom cover 8, and the two are assembled in coaxial fit.
[0060] The connecting member I 3 is fixedly connected to the circular connecting groove 11 below the needle handle 1. The telescopic tube 4 includes an upper end, a lower end thin-walled disc 10, and a foldable tube body located between the upper end and the lower end thin-walled disc 10. The thin-walled disc 10 at the upper end of the telescopic tube 4 is clamped between the connecting member I 3 and the circular connecting groove 11 below the needle handle 1. With the cooperation of the positioning pin 12 on the connecting member I 3 and the positioning hole 13 at the upper end of the telescopic tube 4, the thin-walled disc 10 at the upper end of the telescopic tube 4 is fixedly connected between the connecting member I 3 and the needle handle 1;
[0061] The connecting member II 5 is fixedly connected to the circular groove 14 of the anti-stabbing disc upper cover 6. The thin-walled disc 10 at the lower end of the telescopic tube 4 is clamped between the connecting member II 5 and the anti-stabbing disc upper cover 6. With the cooperation of the positioning pin 12 on the connecting member II 5 and the positioning hole 13 at the lower end of the telescopic tube 4, the thin-walled disc 10 at the lower end of the telescopic tube 4 is fixedly connected between the connecting member II 5 and the anti-stabbing disc upper cover 6;
[0062] The anti-stabbing disc upper cover 6 is fixedly connected to the anti-stabbing disc bottom cover 8;
[0063] When the special needle is in the use state, the telescopic tube 4 is in a folded and compressed state and has a certain ability to maintain the folded and compressed state. Under the action of the self-gravity of the telescopic tube 4, the connecting member, the anti-stabbing disc upper cover 6, the elastic piece 7, and the anti-stabbing disc bottom cover 8, it will not be stretched;
[0064] When the special needle is in use, the needle tube 9 passes through the lower end face of the anti-stabbing disk bottom cover 8 and inserts into the skin and the drug delivery device, and the lower end face of the anti-stabbing disk bottom cover 8 contacts the patient's skin or gauze;
[0065] When the special needle is in use, the needle tube 9 passes through the needle tube hole 15 of the anti-stabbing disk bottom cover 8, and the elastic piece 7 is compressed by the needle tube 9.
[0066] In a specific embodiment, when the special needle is in the state of withdrawing the needle, the implanted drug delivery device is withdrawn as Figures 3 to 4 shown, the needle handle 1 is connected with two wings 2 through the needle tube connecting seats 22 located on both sides thereof, and the needle tube 9 is successively divided into a horizontal section, a bent section, a vertical section and a needle tip;
[0067] The needle handle 1 includes a cover body and a main body portion fixedly connected to the cover body. A circular connecting groove 11 is provided on the lower side of the cover body, and a channel penetrating the cover body and the main body portion fixedly connected to the cover body is provided at the center of the circular connecting groove 11 to fix at least the horizontal section of the needle tube 9.
[0068] After the use of the special needle, during the process of withdrawing the needle, the medical staff can use the auxiliary hand to press the upper cover 6 of the anti-stabbing disk, and use the active hand to pinch the left and right wings 2 of the needle handle 1, and pull the needle handle 1 upward to drive the needle tube 9 to move upward and withdraw the drug delivery device;
[0069] The needle tube 9 is fixedly connected to the needle handle 1, and the needle handle 1 is fixedly connected to the upper end of the telescopic tube 4. During the process of the needle tube 9 being withdrawn upward, the telescopic tube 4 moves upward synchronously under the tensile force transmitted by the needle handle 1, and the telescopic tube 4 is stretched;
[0070] When the telescopic tube 4 is straightened and cannot be stretched any further, at this time, the needle tip portion of the needle tube 9 completely enters the inner cavities of the upper cover 6 and the bottom cover 8 of the anti-stabbing disk, and the needle tube 9 no longer contacts the elastic piece 7 to squeeze the elastic piece 7, and the elastic piece 7 rebounds, and the blocking piece portion 16 completely blocks the needle tube hole 15 of the anti-stabbing disk bottom cover 8, and the needle tube 9 cannot pass through the needle tube hole 15 of the anti-stabbing disk bottom cover 8 again, playing a role in preventing stabbing;
[0071] In the state of withdrawing the needle, the needle tip at the lower end of the needle tube 9 is blocked by the blocking piece portion 16 of the elastic piece 7 and cannot move downward through the anti-stabbing disk bottom cover 8. Under the combined action of the telescopic tube 4, the needle tip is restricted in the inner cavity of the anti-stabbing disk formed by the upper cover 6 and the bottom cover 8 of the anti-stabbing disk;
[0072] In the state of withdrawing the needle, the telescopic tube 4 is straightened. Without violent destruction, the needle tube 9 cannot move upward continuously, and the needle tip is restricted in the inner cavity of the anti-stabbing disk formed by the upper cover 6 and the bottom cover 8 of the anti-stabbing disk. The vertical section c of the needle tube 9 is inside the telescopic tube 4 and does not contact the human body, playing a protective role.
[0073] As Figure 5As shown, the material of the needle handle 1 is plastic;
[0074] The needle handle 1 is adapted to needle tubes 9 of different sizes and is integrally formed by injection molding. The needle handle 1 is mainly composed of a needle tube connecting seat 22 above and a circular connecting groove 11 below;
[0075] The needle tube connecting seat 22 is fixedly connected to the horizontal section a and the bent section c of the needle tube 9 by injection molding. The two sides of the needle tube connecting seat 22 are respectively fixedly connected to the left and right wings 2, and the lower end is fixedly connected to the circular connecting groove 11;
[0076] The circular connecting groove 11 is fixedly connected to the upper end of the vertical section c of the needle tube 9 by injection molding. The upper end of the circular connecting groove 11 is connected to the needle tube connecting seat 22. Below is a circular groove f. The depth of the circular groove f is equal to the sum of the thickness of the connector I 3 and the thickness of the thin-walled disc 10. The radial dimension of the circular groove f is adapted to the radial dimension of the connector I 3. The connector I 3 can be pressed into the circular groove f and fixedly connected by an adhesive;
[0077] The two wings 2 are connected to the needle tube connecting seat 22. The thickness of the connection part e is relatively thin, so it is relatively soft. The two wings 2 can be turned over at the connection with the needle tube connecting seat 22; when inserting or removing the needle, turn the two wings 2 up by 90°. Medical staff can pinch the two-wing groove 17 on the front of the turned-over two wings 2 with the thumb and index finger. The two wings 2 can be designed according to ergonomics into shapes and sizes suitable for different-sized hands to grasp, making the grip more firm and facilitating medical staff to control the force.
[0078] As Figure 6 shown, the material of the connector I 3 is plastic or stainless steel;
[0079] The main body of the connector I 3 is a ring structure. There are raised cylindrical positioning pins 12 on the upper surface of the ring, which can be 2 or more according to the actual situation, and generally 3 can be set;
[0080] The outer diameter of the connector I 3 is adapted to the inner diameter of the groove of the circular connecting groove 11 of the needle handle 1. The connector I 3 can be pressed into the groove of the circular connecting groove 11 of the needle handle 1 and fixedly connected by an adhesive;
[0081] The connector I 3 is assembled coaxially with the thin-walled disc 10 at the upper end of the telescopic tube 4;
[0082] The cylindrical positioning pin 12 of the connector I 3 is used to cooperate with the thin-walled disc 10 at the upper end of the telescopic tube 4. The outer diameter of the positioning pin 12 is adapted to the inner diameter of the positioning hole 13 on the upper end surface of the telescopic tube 4, and the thickness of the positioning pin 12 is the same as the thickness of the thin-walled disc 10 on the upper end surface of the telescopic tube 4 and the wall thickness of the telescopic tube;
[0083] The thickness of the circular ring of the connecting piece Ⅰ3 is adapted to the inner ring height at the upper end of the telescopic tube 4, and the inner diameter of the circular ring of the connecting piece Ⅰ3 is adapted to the outer diameter of the inner ring at the upper end of the telescopic tube 4;
[0084] The connecting piece Ⅰ3 is clamped between the lower surface of the thin-walled disc 10 at the upper end of the telescopic tube 4 and the upper surface of the outer ring;
[0085] The connecting piece Ⅱ5 has the same material and dimensions as the connecting piece Ⅰ3;
[0086] The connecting piece Ⅱ5 has a main body circular ring structure, and there are 3 protruding cylindrical positioning pins 12 on the upper surface of the circular ring;
[0087] The depth of the circular ring-shaped sunk groove 14 is equal to the sum of the thickness of the connecting piece Ⅱ5 and the thickness of the thin-walled disc 10 of the connecting piece. The radial dimension of the circular ring-shaped sunk groove 14 is adapted to the radial dimension of the connecting piece Ⅱ5. The thin-walled disc 10 is assembled coaxially with the connecting piece Ⅱ5. The connecting piece Ⅱ5 can be pressed into the circular groove circular connecting groove 11 on the upper end surface of the anti-stabbing disc upper cover 6 and fixed by adhesive;
[0088] The connecting piece Ⅱ5 is assembled coaxially with the thin-walled disc 10 at the lower end of the telescopic tube 4;
[0089] The cylindrical positioning pin of the connecting piece Ⅱ5 is used to cooperate with the thin-walled disc 10 at the lower end of the telescopic tube 4. The outer diameter of the positioning pin is adapted to the inner diameter of the positioning hole 13 on the lower end surface of the telescopic tube 4, and the thickness of the positioning pin is the same as the thickness of the telescopic tube wall of the thin-walled disc 10 at the lower end of the telescopic tube 4;
[0090] The thickness of the circular ring of the connecting piece Ⅱ5 is adapted to the inner ring height at the lower end of the telescopic tube 4, and the inner diameter of the circular ring of the connecting piece Ⅱ5 is adapted to the outer diameter of the inner ring at the lower end of the telescopic tube 4.
[0091] As Figures 7 to 8 shown, the telescopic tube 4 is a corrugated tube, and the material is silicone or other elastic flexible materials; the middle part of the telescopic tube 4 is a thin-walled hollow tube, and the initial state is a folded state. In the folded state, the inner ring is small and the outer ring is large; under the action of a tensile force greater than a certain value, the telescopic tube 4 can be axially stretched to a straight tube state.
[0092] In the use state, the telescopic tube 4 is in a folded and compressed state; in the needle-pulling state, the telescopic tube 4 is axially stretched into an equal-diameter thin-walled hollow straight tube, and the maximum stretching stroke is the difference between the outer diameter and the inner diameter in the folded state multiplied by 2 times the number of folding layers. According to the length of the needle tube 9, the number of layers of the telescopic tube 4 and the inner and outer diameters can be adjusted to change the maximum stroke in the stretched state.
[0093] Both ends of the telescopic tube 4 are thin-walled discs 10, and the outer diameter is slightly smaller than the outer diameters of the connecting piece Ⅰ3 and the connecting piece Ⅱ5. The thickness of the thin-walled disc 10 is the wall thickness of the telescopic tube 4.
[0094] There are 3 positioning holes 13 evenly distributed on the disc, and the diameter of the positioning holes 13 is the same as the outer diameter of the 3 positioning pins 12 of the connecting piece Ⅰ 3 and the connecting piece Ⅱ 5.
[0095] The thin-walled discs 10 at both ends of the telescopic tube 4 are made of soft material and can be bent through the circular connection groove 11 of the circular hole of the connecting piece Ⅰ 3 or the connecting piece Ⅱ 5 by external force. After passing through, the external force is removed, and the thin-walled discs 10 return to their original shape. The 3 positioning pins 12 of the connecting piece Ⅰ 3 or the connecting piece Ⅱ 5 are inserted into the 3 positioning holes 13 on the disc. The thickness of the positioning pins 12 is the same as the thickness of the thin-walled discs 10, the diameter of the positioning pins 12 is the same as the diameter of the positioning holes 13, the inner diameter of the ring of the connecting piece Ⅰ 3 or the connecting piece Ⅱ 5 is adapted to the outer diameter of the inner ring at both ends of the telescopic tube 4, and the disc thickness of the connecting piece Ⅰ 3 or the connecting piece Ⅱ 5 is adapted to the inner ring height at both ends of the telescopic tube 4.
[0096] Both ends of the telescopic tube 4 can be closely fitted with the connecting piece Ⅰ 3 or the connecting piece Ⅱ 5. Under the installation and cooperation of the positioning pins of the connecting piece, that is, the positioning pins 12 and the positioning holes 13 at both ends of the telescopic tube 4, the two cannot move relative to each other in the radial direction.
[0097] As Figure 9 shown, the material of the anti-stabbing disc upper cover 6 is hard transparent plastic;
[0098] The whole anti-stabbing disc upper cover 6 can be injection-molded;
[0099] The main body of the anti-stabbing disc upper cover 6 is a thin-walled hollow structure with a through needle tube hole 15, the diameter of which is slightly larger than the diameter of the needle tube 9, and the needle tube 9 can pass through the needle tube hole 15;
[0100] The upper end surface of the anti-stabbing disc upper cover 6 has a non-through circular groove (circular connection groove 11), the depth of the groove is equal to the sum of the thickness of the connecting piece Ⅱ 5 and the thickness of the thin-walled disc 10, the diameter of the groove is adapted to the outer diameter of the ring of the connecting piece Ⅱ 5, and the connecting piece Ⅱ 5 can be pressed into the groove and fixed by adhesive connection;
[0101] The inner cavity of the protective cover of the anti-stabbing disc upper cover 6 is a hollow structure, and the thickness of the protective cover is greater than the length of the tip of the needle tube 9. In the state of needle withdrawal, the tip of the needle tube 9 is in the inner cavity of the protective cover;
[0102] The bottom plate of the anti-stabbing disc upper cover 6 is a thin-walled disc 10 structure, the diameter of the disc is the same as the diameter of the anti-stabbing disc bottom cover 8, and the two are assembled coaxially;
[0103] The lower end surface of the anti-stabbing disc upper cover 6 and the upper end surface of the anti-stabbing disc bottom cover 8 can be fixedly connected by ultrasonic welding.
[0104] As Figure 10 shown, the material of the elastic piece 7 is spring steel sheet metal or elastic plastic piece;
[0105] The elastic sheet 7 includes a stop sheet portion 16, elastic segments 18 and limiting segments 19. The elastic segments 18 are located on both sides of the end of the stop sheet portion 16 and incline outwards. The limiting segments 19 are respectively connected to the ends on both sides of the elastic segments 18, and the limiting segments 19 are snap-fitted into the elastic sheet limiting grooves 20 of the special-shaped groove 21;
[0106] When the syringe 9 passes through the syringe hole 15 of the anti-stabbing disk bottom cover 8, the stop sheet portion 16 abuts against the body of the syringe 9, and the elastic segments 18 are in a compressed state;
[0107] When the syringe 9 is withdrawn from the syringe hole 15 of the anti-stabbing disk bottom cover 8, the syringe 9 is separated from the stop sheet portion 16, the elastic segments 18 return to the natural state, and the stop sheet portion 16 seals the syringe hole 15 of the anti-stabbing disk 8 bottom cover;
[0108] The elastic segments 18 on both sides of the elastic sheet 7 have elasticity. When the special needle is in the use state, under the combined action of the extrusion force of the syringe 9 and the acting force of the anti-stabbing disk bottom cover 8, the elastic sheet 7 is extruded and deformed; when the special needle is in the state of needle withdrawal, the elastic sheet 7 is no longer subjected to the extrusion force of the syringe 9, and the elastic sheet 7 rebounds to the natural state;
[0109] The limiting segments 19 on both sides of the elastic sheet 7 are rectangular thin sheets, and the dimensions are adapted to the dimensions of the elastic sheet limiting grooves 20 of the anti-stabbing disk bottom cover 8. The limiting segments 19 are assembled with the elastic sheet limiting grooves 20. When the elastic sheet 7 is subjected to the extrusion force of the syringe 9, the elastic sheet 7 is extruded, and the limiting segments 19 can move along the guiding direction of the elastic sheet limiting grooves 20.
[0110] As Figure 11 shown, the material of the anti-stabbing disk bottom cover 8 is the same as that of the anti-stabbing disk upper cover 6, which is hard transparent plastic;
[0111] The anti-stabbing disk bottom cover 8 can be integrally formed by injection molding;
[0112] The main body of the anti-stabbing disk bottom cover 8 is a thin-walled disk 10 with a through syringe hole 15 in the center, and the diameter is slightly larger than the diameter of the syringe 9. The syringe 9 can pass through the syringe hole 15;
[0113] The upper end surface of the anti-stabbing disk bottom cover 8 has a non-through special-shaped groove 21, and the shape and size of the special-shaped groove 21 are adapted to the shape and size of the elastic sheet 7. The elastic sheet 7 can be pressed into the elastic sheet limiting groove 20 of the special-shaped groove 21;
[0114] The diameter of the anti-stabbing disk bottom cover 8 is the same as the diameter of the bottom plate of the anti-stabbing disk upper cover 6, and the two are assembled coaxially;
[0115] The upper end surface of the anti-stabbing disk bottom cover 8 and the lower end surface of the anti-stabbing disk upper cover 6 can be fixedly connected by ultrasonic welding.
[0116] As Figure 12As shown, the syringe 9 is made of stainless steel and is divided into four parts: a horizontal section a, a bent section b, a vertical section c, and a needle tip d.
[0117] The inner and outer diameters of the syringe 9 meet the requirements of GB / T18457-2015, and the needle tip size meets the requirements of YY0881-2013.
[0118] The syringe 9 is fixedly connected to the needle handle 1 by injection molding. The horizontal and bent sections of the syringe are connected to the syringe connection seat 22 of the needle handle 1, and the upper end of the vertical section of the syringe is connected to the circular connection groove 11 of the needle handle 1.
[0119] The needle tip of the syringe 9 is a non-damaging needle structure, which reduces the damage to the skin or the silicone pad of the drug delivery device during use.
[0120] The end of the horizontal section of the syringe 9 can be connected to an extension tube to form a complete special needle structure for the drug delivery device.
[0121] For the present utility model, the un-described parts are prior art.
[0122] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.
Claims
1. A needle puncture prevention structure for an implantable drug delivery device, characterized in that: include: Needle handle (1); An anti-stab disc, the anti-stab disc having a needle tube hole (15) and a spring sheet (7), the spring sheet (7) being switchable to block the needle tube hole (15); A telescopic tube (4), wherein the telescopic tube (4) has a hollow inner cavity, one end of the telescopic tube (4) is fixedly connected to the needle handle (1), and the other end of the telescopic tube (4) is fixedly connected to the anti-puncture disk; A needle tube (9), one end of the needle tube (9) is fixed in the needle handle (1), and the other end passes through the telescopic tube (4) and then passes through the needle tube hole (15) through the anti-puncture disk; wherein, In the use state, the needle tube (9) extends out from the needle tube hole (15) located at the bottom of the stab-proof plate, and the spring sheet (7) abuts against the body of the needle tube (9), and the telescopic tube (4) is folded and compressed; In the needle withdrawal state, the needle tube (9) is withdrawn from the needle tube hole (15) located at the bottom of the anti-puncture disk, and the spring sheet (7) blocks the needle tube hole (15), and the telescopic tube (4) is axially stretched.
2. The needle puncture prevention structure for an implantable drug delivery device according to claim 1, characterized in that: The telescopic tube (4) comprises upper and lower thin-walled discs (10) and a foldable tube body located between the upper and lower thin-walled discs (10).
3. The needle puncture prevention structure for an implantable drug delivery device according to claim 2, characterized in that: The stab-proof plate comprises an upper cover (6) of the stab-proof plate, a bottom cover (8) of the stab-proof plate, and a chamber located between the upper cover (6) and the bottom cover (8) of the stab-proof plate. The lower end surface of the upper cover (6) of the stab-proof plate is fixedly connected to the upper end surface of the bottom cover (8) of the stab-proof plate. The upper cover (6) of the stab-proof plate and the bottom cover (8) of the stab-proof plate are both provided with a needle tube hole (15). The projection of the needle tube hole (15) penetrating the upper cover (6) of the stab-proof plate on the bottom cover (8) of the stab-proof plate overlaps with the position of the needle tube hole (15) penetrating the bottom cover (8) of the stab-proof plate. A circular sink groove (14) is concentrically provided on the outer periphery of the needle tube hole (15) on the upper end surface of the stab-proof plate.
4. A needle puncture prevention structure for an implantable drug delivery device according to claim 1 or 2, characterized in that: The needle handle (1) is connected to two wings (2) via needle tube connecting seats (22) located on both sides thereof, and the needle tube (9) is sequentially divided into a horizontal section, a curved section, a vertical section and a needle tip; The needle handle (1) comprises a cover body and a main body fixed to the cover body, a circular connecting groove (11) is arranged on the lower side of the cover body, and a channel penetrating the cover body and the main body fixed to the cover body is arranged at the center of the circular connecting groove (11) to fix at least the horizontal section of the needle tube (9).
5. The needle puncture prevention structure for an implantable drug delivery device according to claim 4, characterized in that: The thin-walled discs (10) at the upper and lower ends of the telescopic tube (4) are respectively fixed to the needle handle (1) and the anti-stab disc via connecting pieces; wherein: The connecting member comprises a connecting member I (3) positioned and installed at the upper end of the telescopic tube (4) and a connecting member II (5) positioned and installed at the lower end of the telescopic tube (4); the connecting member I (3) is fixedly connected to a circular connecting groove (11) below the needle handle (1); a thin-walled disc (10) at the upper end of the telescopic tube (4) is clamped between the connecting member I (3) and the circular connecting groove (11) below the needle handle (1); the connecting member II (5) is fixedly connected to a circular recessed groove (14) of an anti-stab disc upper cover (6); and the thin-walled disc (10) at the lower end of the telescopic tube (4) is clamped between the connecting member II (5) and the anti-stab disc upper cover (6).
6. The needle puncture prevention structure for an implantable drug delivery device according to claim 5, characterized in that: The connecting piece I (3) and the connecting piece II (5) both have a positioning pin (12), and the upper end and the lower end of the telescopic tube (4) both have a positioning hole (13) that matches the positioning pin (12).
7. The needle puncture prevention structure for an implantable drug delivery device according to claim 5, characterized in that: The depth of the annular groove (14) is equal to the sum of the thickness of the connecting member II (5) and the thickness of the thin-walled disc (10) of the connecting member. The radial dimension of the annular groove (14) is matched with the radial dimension of the connecting member II (5). The thin-walled disc (10) and the connecting member II (5) are coaxially assembled.
8. The needle puncture prevention structure for an implantable drug delivery device according to claim 7, characterized in that: The upper end surface of the anti-stab plate bottom cover (8) is provided with a non-penetrating special-shaped groove (21), and the shape and size of the special-shaped groove (21) are matched with the shape and size of the spring piece (7).
9. The needle puncture prevention structure for an implantable drug delivery device according to claim 8, characterized in that: The spring piece (7) comprises a blocking piece portion (16), an elastic section (18) and a limiting section (19), wherein the elastic section (18) is located at both sides of the end of the blocking piece portion (16) and is inclined outward, the limiting section (19) is respectively connected to the ends of both sides of the elastic section (18), and the limiting section (19) is clamped in the spring piece limiting groove (20) of the special-shaped groove (21); When the needle tube (9) passes through the needle tube hole (15) of the anti-stab plate bottom cover (8), the blocking piece portion (16) abuts against the needle tube (9) and the elastic section (18) is in a compressed state; When the needle tube (9) is withdrawn from the needle tube hole (15) of the stab-proof plate bottom cover (8), the needle tube (9) is separated from the blocking piece part (16), the elastic section (18) returns to a natural state, and the blocking piece part (16) blocks the needle tube hole (15) of the stab-proof plate bottom cover (8).
10. The needle puncture prevention structure for an implantable drug delivery device according to claim 1, characterized in that: The telescopic tube is a corrugated tube. When in use, the telescopic tube (4) is in a folded and compressed state; when the needle is removed, the telescopic tube (4) is axially stretched to become a thin-walled hollow straight tube of equal diameter.