A drug delivery device with precise quantitative measurement and adjustable injection depth

Abstract

The present invention discloses a drug delivery device with precise quantitative dosage and adjustable injection depth, and relates to the technical field of drug delivery. A first needle is arranged in a first tube body, and the first needle is slidably matched with the first tube body; a first accommodating cavity is arranged in the first needle head, and a first telescopic component is located on the first needle head; a second needle is arranged at a first end of a second tube body, and a syringe pump is connected to a second end of the second tube body, an input end of the syringe pump is connected to a drug liquid storage tank, and an output end of the syringe pump is connected to a second end of the second tube body, a second telescopic component is located on the second tube body, and the first accommodating cavity is used for being sleeved on the outer side of the second tube body; the first needle is extended out of the first tube body by the first telescopic component, and punctured until the first needle reaches a lesion area, and after the first needle reaches the lesion, the first needle is put into the first tube body, so that the first end of the first tube body is close to the lesion area, so as to avoid the problem of the first needle damaging the surrounding tissue of the lesion during drug delivery, and reduce the damage to the patient during drug delivery.

Description

Technical Field

[0001] The invention relates to the technical field of drug administration, in particular to a drug administration device with precise quantitative determination and adjustable injection depth. Background Art

[0002] In the prior art, in vivo drug administration is completed by moving the drug delivery device to the lesion area such as the liver and ovaries where drug administration is required. However, in the two steps of puncture and drug administration of in vivo drug administration, the puncture needle in the drug delivery device often needs to have a higher hardness and a larger diameter to complete the puncture of the tough tissue. After reaching the lesion, using the same needle for drug administration is likely to cause unnecessary damage to the area around the lesion; and because the needle body is relatively thick, it is not possible to administer fine small volumes of liquid medicine (μl level); at the same time, the depth of drug administration in this scenario is extremely dependent on the doctor's experience and feel, and it is difficult to achieve uniform depth injection at multiple sites in the lesion area. Therefore, how to avoid unnecessary damage to the area around the lesion caused by the needle in the drug delivery device while completing in vivo drug administration, and at the same time, how to complete uniform depth and quantitative drug administration at multiple sites in the lesion area has become a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0003] The purpose of the present invention is to provide a drug delivery device with precise quantitative administration and adjustable injection depth, so as to avoid unnecessary damage to the area around the lesion caused by the needle in the drug delivery device while completing the in vivo drug delivery, and to complete uniform depth and quantitative administration to multiple sites in the lesion area.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a drug delivery device, comprising:

[0006] A first tube body, wherein a first needle is disposed in the first tube body, and the first needle is slidably matched with the first tube body in the axial direction of the first tube body;

[0007] The first needle head has a first accommodating cavity therein;

[0008] A first telescopic assembly, the first telescopic assembly is located on the first needle head, and the first telescopic assembly is used to drive the first needle head to extend out and retract into the first tube body;

[0009] A second tube body, wherein a first end of the second tube body has a second needle, and a second end of the second tube body is connected to a drug delivery assembly;

[0010] The drug delivery assembly includes a syringe pump, the input end of the syringe pump is connected to a drug solution storage tank, and the output end of the syringe pump is connected to the second end of the second tube body;

[0011] A second telescopic assembly, the second telescopic assembly is located on the second tube body, the second telescopic assembly is used to drive the second needle to extend and retract into the second tube body, and the second telescopic assembly can limit the position of the second needle, so that when the second needle is in use, it extends a set length without being retracted into the second tube body, and when the second needle is not in use, it is retracted into the second tube body;

[0012] The first accommodating cavity is used to be sleeved on the outer side of the second tube body.

[0013] Preferably, the first telescopic assembly comprises:

[0014] A push-pull rod, the push-pull rod comprising a first rod segment and a second rod segment, the first end of the first rod segment is connected to the side of the first needle, the second end of the first rod segment is connected to the first end of the second rod segment, the second end of the second rod segment extends out of the second tube, and the first rod segment and the second rod segment are arranged vertically;

[0015] And / or, the first telescopic component further includes:

[0016] A first blocking member, which is sleeved on the first end of the first needle and extends outwardly in the radial direction of the first needle;

[0017] A second stopper, the second stopper is located at the first end of the first tube and extends radially inwardly along the first tube;

[0018] a third stopper, the third stopper being located at the second end of the first tube body and extending radially inwardly along the first tube body;

[0019] A connecting sleeve, the connecting sleeve is located on the inner side of the first tube body and extends along the axial direction of the first tube body, the side of the first end of the connecting sleeve is connected to the second stopper, the second end of the connecting sleeve is connected to the side of the third stopper facing the second stopper, the connecting sleeve, the second stopper, the third stopper and the inner side of the first tube body form a third slide groove, and the third slide groove is arranged along the axial direction of the first tube body;

[0020] A deformation block is located on one side of the first blocking member close to the first end of the first tube body, and the deformation block can absorb water and expand.

[0021] Preferably, the second telescopic assembly comprises:

[0022] a first slide groove, the first slide groove is opened along the axial direction of the second tube body, and the distance between the second end of the first slide groove and the first end of the second tube body is not less than the length of the second needle;

[0023] A telescopic switch, wherein the telescopic switch is slidably matched with the first slide groove, the first end of the telescopic switch extends out of the first slide groove to form a control portion, and the second end of the telescopic switch extends into the second tube body and is connected to the second needle.

[0024] Preferably, an ultrasonic viewing tube, wherein the ultrasonic viewing tube is located inside the first accommodating cavity;

[0025] And / or, an anti-slip portion is provided on the second end of the first tube body and the second end of the second tube body.

[0026] Preferably, the second telescopic assembly comprises:

[0027] A first locking member, the first locking member is located on the inner wall of the second tube body and is opened along the axial direction of the second tube body;

[0028] a second slide groove, the second slide groove being opened along the axial direction of the second tube body;

[0029] A switch, wherein the switch is slidably matched with the second slide groove, the first end of the switch extends out of the second tube body to form a button, the second end of the switch extends into the second tube body, the side of the switch is provided with a second locking member matched with the first locking member extending along the axial direction of the second tube body, and the second locking member is located inside the second tube body;

[0030] At least two switches are provided and are evenly distributed along the circumference of the second tube body. A first elastic member is provided between the second locking member and the second needle.

[0031] Preferably, the second telescopic assembly further comprises: a guide member, the guide member comprising a guide rod and a guide groove opened along the radial direction of the second tube body, the guide rod is located on the second needle head, and the guide groove is located at the second end of the switch.

[0032] Preferably, the second telescopic assembly further comprises a support plate, the support plate is provided along the radial direction of the second tube body, and the second needle head is arranged to avoid the support plate;

[0033] A needle tube seat is sleeved on the second needle head, a second elastic member is provided between the needle tube seat and the support plate, and the second elastic member is arranged along the axial direction of the second tube body.

[0034] Preferably, the second telescopic assembly further comprises:

[0035] A first limiting member is located in the second tube body, and is used to prevent the second needle from being separated from the second tube body.

[0036] Preferably, a first baffle is provided at the first end of the second tube;

[0037] An operating rod, wherein a first end of the operating rod is connected to an end of the second needle head away from the needle tip, a second end of the operating rod extends out of the second tube body, and the operating rod and the second needle head are both rotatably connected to the second tube body;

[0038] The second telescopic assembly comprises:

[0039] A limiting plate; the limiting plate is sleeved on the second needle head;

[0040] a third elastic member, the third elastic member being sleeved on the second needle head and located between the first baffle plate and the limiting plate;

[0041] A plurality of positioning members are arranged along the axial direction of the second tube body and are located inside the second tube body. The positioning members and the limiting plate form a rotation limiting fit in the axial direction of the second tube body.

[0042] Preferably, the first end of the first tube is a flat end;

[0043] And / or, the second tube body is a flexible tube, and the axial length of the second tube body is greater than the axial length of the first tube body.

[0044] Compared with the prior art, the present invention has achieved the following technical effects:

[0045] The present invention uses a first telescopic component to allow the first needle to extend out of the first tube body to a required length, and then starts puncturing. After the first needle pierces the skin and reaches the lesion in the body, the first telescopic component is used to retract the first needle into the first tube body, so that the first end of the first tube body is close to the lesion. After the first end of the second tube body reaches the lesion, the second tube body is extended into the first accommodating cavity, and the second telescopic component is used to allow the second needle to extend from the second tube body and the first accommodating cavity and extend into the lesion to inject medicine until the injection is completed. After the first needle reaches the lesion, the first telescopic component is used to retract the first needle into the first tube body, which reduces the contact of the first needle with the lesion area during the in vivo drug administration process, and avoids the first needle from directly contacting the surrounding tissues of the lesion after the puncture is completed, which causes the first needle to damage the surrounding tissues of the lesion. The problem of tissue is solved. At the same time, the second needle can be retracted into the second tube body through the second telescopic component. This makes it possible for the second needle to avoid contact with the tissue around the lesion when searching for the next injection point after completing a single injection, thereby avoiding the problem of the second needle damaging the tissue around the lesion when searching for the injection point; the second telescopic component controls the second needle to extend to a required length, so that the second needle can maintain the extended length without retracting during use, so that the second needle can achieve uniform (i.e., the same) depth of drug administration to multiple sites in the lesion area, and the injection pump enables the second needle to quantitatively administer the drug to the lesion area; that is, the drug delivery device in the present invention avoids unnecessary damage to the area around the lesion caused by the needle in the drug delivery device while completing in vivo drug delivery, and completes uniform depth and quantitative drug delivery to multiple sites in the lesion area. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 is a schematic diagram of a first structure of a second telescopic assembly;

[0048] Figure 2 is a second structural schematic diagram of the second telescopic assembly;

[0049] Figure 3 is a third structural schematic diagram of the second telescopic component;

[0050] Figure 4 It is a structural schematic diagram of the first telescopic assembly when the first needle is located outside the first tube body;

[0051] Figure 5 It is a structural schematic diagram of the first telescopic assembly when the first needle retracts into the first tube body;

[0052] Among them, 1. the first slide groove; 2. the telescopic switch; 3. the anti-slip part; 4. the second needle; 5. the second tube; 6. the first locking piece; 7. the switch; 8. the second locking piece; 9. the first elastic piece; 10. the guide rod; 11. the support plate; 12. the needle tube seat; 13. the second elastic piece; 14. the first limiting piece; 15. the first baffle plate; 16. the limiting plate; 17. the third elastic piece; 18. the positioning plate; 19. the positioning groove; 20. the positioning port; 21. the operating rod; 22. the first needle; 23. the first tube; 24. the third slide groove; 25. the connecting sleeve; 26. the first blocking piece; 27. the rubber sleeve; 28. the first annular gap; 29. ​​the first rod section; 30. the second rod section; 31. the deformation block. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] like Figure 1-Figure 5As shown, the present invention discloses a drug delivery device with precise quantitative injection and adjustable injection depth, comprising: a first tube body 23, a first needle 22 is arranged in the first tube body 23, the first needle 22 and the first tube body 23 are slidably matched in the axial direction of the first tube body 23, and a first accommodating cavity is arranged in the first needle 22; a first telescopic component, the first telescopic component is located on the first needle 22, and the first telescopic component is used to drive the first needle 22 to extend and retract into the first tube body 23; a second tube body 5, a first end of the second tube body 5 has a second needle 4, and the second end of the second tube body 5 is connected to the drug delivery component, and the drug delivery component includes an injection pump, and the input end of the injection pump is connected to the drug delivery device. The liquid storage tank, the output end of the injection pump is connected to the second end of the second tube body 5; the second telescopic assembly, the second telescopic assembly is located on the second tube body 5, the second telescopic assembly is used to drive the second needle 4 to extend and retract into the second tube body 5, and the second telescopic assembly can limit the position of the second needle 4, so that when the second needle 4 is in use, it extends a set length without being retracted into the second tube body 5, and when the second needle 4 is not in use, it can be retracted into the second tube body 5; the first accommodating cavity is used to be sleeved on the outside of the second tube body 5, that is, the second tube body 5 can be extended into the first accommodating cavity, and the second needle 4 can be extended from the first accommodating cavity by adjusting the second telescopic assembly. The needle tip of the first needle 22 faces the outside of the first tube body 23, and the needle tip of the second needle 4 faces the outside of the second tube body 5.

[0056] The present invention uses a first telescopic component to allow the first needle 22 to extend out of the first tube 23 to a required length before starting puncture. After the first needle 22 pierces the skin and reaches the lesion in the body, the first telescopic component is used to retract the first needle 22 into the first tube 23, so that the first end of the first tube 23 is close to the lesion. After the first end of the second tube 5 reaches the lesion, the second tube 5 is extended into the first accommodating cavity. The second telescopic component is used to allow the second needle 4 to extend from the second tube 5 and the first accommodating cavity and extend into the lesion to inject medicine until the injection is completed. After the first needle 22 reaches the lesion, the first telescopic component is used to retract the first needle 22 into the first tube 23, which reduces the contact between the first needle 22 and the lesion area during the in vivo drug administration process, and avoids direct contact between the first needle 22 and the surrounding tissues of the lesion after the puncture is completed, resulting in the first The problem of the needle 22 damaging the tissue around the lesion is solved. At the same time, the second needle 4 can be retracted into the second tube 5 through the second telescopic component. This allows the second needle 4 to avoid contact with the tissue around the lesion when looking for the next injection point after completing a single injection, thereby avoiding the problem of the second needle 4 damaging the tissue around the lesion when looking for the injection point; the second telescopic component controls the second needle 4 to extend to a required length, so that the second needle 4 can maintain the extended length without retracting during use, so that the second needle 4 can achieve uniform (i.e., the same) depth of drug administration to multiple sites in the lesion area, and the injection pump enables the second needle 4 to quantitatively administer the drug to the lesion area; that is, the drug delivery device in the present invention avoids unnecessary damage to the area around the lesion caused by the needle in the drug delivery device while completing in vivo drug delivery, and completes uniform depth and quantitative drug delivery to multiple sites in the lesion area.

[0057] Among them, the first tube body 23, the first needle 22 and the second needle 4 can be made of stainless steel. The drug delivery device of the present invention can be used not only for ovarian drug delivery, but also for minimally invasive drug delivery to organs or tissues such as the liver and kidneys. The length of the second tube body 5 can be 300 to 1000 μm. Through the second telescopic component, the second needle 4 in the present invention can realize the functions of fixed-length needle withdrawal and fixed-depth injection of areas such as mucosa. The specific implementation method can be seen below. The diameter of the first needle 22 is above 25G, G is gauge, indicating the thickness of the first needle 22, that is, the outer diameter of the first needle 22, and the larger the G value, the smaller the outer diameter of the first needle 22, for example, 26G is about 0.45mm, and 41G is about 0.1mm. Based on the above-mentioned size of the first needle 22, the first needle 22 further reduces the trauma caused by the drug delivery device in the present invention and achieves a minimally invasive effect.

[0058] After the second telescopic component and the drug delivery component control the second needle 4 to inject into the single-point area of ​​the lesion, because the first accommodating chamber is large enough, the drug delivery device of the present invention can achieve the alignment of the second needle 4 with other areas of the lesion by only adjusting the position of the second tube 5 in the first accommodating chamber without performing a second puncture through the first needle 22, that is, the present invention realizes the function of single puncture multi-point injection, avoiding the problem of multiple punctures causing greater damage to the patient. In addition, in the process of the second tube 5 adjusting its position in the first accommodating chamber, the second needle 4 is retracted into the second tube 5 through the second telescopic component, which avoids the problem of the second needle 4 scratching the lesion area and causing additional damage to the lesion area in the process of adjusting the position of the second needle 4 in the first accommodating chamber and aligning the lesion.

[0059] Furthermore, the drug delivery device of the present invention further comprises: an ultrasonic visual tube, which is located inside the first accommodating cavity. The ultrasonic visual tube is located inside the second tube body 5, or inside the first accommodating cavity, and an ultrasonic probe is placed inside the ultrasonic visual tube. The ultrasonic probe and external imaging equipment are used to determine whether the second tube body 5 and the first needle 22 have reached the lesion area. The injection pump can achieve the same dosage for multiple administrations, and achieve uniform drug delivery to all lesions.

[0060] The second end of the second tube body 5 of the present invention is provided with an anti-slip portion 3. The anti-slip portion 3 is not limited to being provided in the above-mentioned area, but can also be provided in other operation areas, so as to increase the friction between the operator and the second tube body 5, and prevent the operator from slipping when operating the drug delivery device of the present invention. The anti-slip portion 3 can be anti-slip grooves, anti-slip coatings, or other structures that can increase the friction between the operator and the second tube body 5.

[0061] like Figure 4-Figure 5 As shown, the first telescopic assembly in the present invention includes a push-pull rod, which includes a first rod segment 29 and a second rod segment 30. The first end of the first rod segment 29 is connected to the side of the first needle 22, the second end of the first rod segment 29 is connected to the first end of the second rod segment 30, the second end of the second rod segment 30 extends out of the first tube 23, and the first rod segment 29 and the second rod segment 30 are arranged vertically. By pulling the push-pull rod inward, the push-pull rod can drive the first needle 22 to move into the first tube 23 until the first needle 22 completely enters the first tube 23; pushing the push-pull rod outward can make the push-pull rod drive the first needle 22 to move out of the first tube 23 until the first needle 22 extends to a desired length. The extension length of the first needle 22 can be fixed by the operator manually maintaining the position of the push-pull rod.

[0062] In order to facilitate the operator to grasp the extension length of the first needle 22, a scale line can also be set on the push-pull rod to clearly know the extension length of the first needle 22 from the first tube 23. It should be noted that the aperture of the first accommodating cavity of the first needle 22 is large enough so that even after the push-pull rod and the connecting sleeve 25 are arranged in the first accommodating cavity, the second tube 5 can still extend into the first accommodating cavity and move along the first accommodating cavity.

[0063] like Figure 4-Figure 5 As shown, and / or, the first telescopic assembly also includes: a first stopper 26, the first stopper 26 is sleeved on the first end of the first needle 22 and extends radially outward from the first needle 22; a second stopper, the second stopper is located at the first end of the first tube 23 and extends radially inward from the first tube 23; a third stopper, the third stopper is located at the second end of the first tube 23 and extends radially inward from the first tube 23; a connecting sleeve 25, the connecting sleeve 25 is located on the inner side of the first tube 23, and Extending axially along the first tube body 23, the side of the first end of the connecting sleeve 25 is connected to the second clamping piece, and the second end of the connecting sleeve 25 is connected to the side of the third clamping piece facing the second clamping piece. The connecting sleeve 25, the second clamping piece, the third clamping piece and the inner side of the first tube body 23 form a third slide groove 24, and the third slide groove 24 is arranged along the axial direction of the first tube body 23; the deformation block 31, the deformation block 31 is located on the side of the first clamping piece 26 close to the first end of the first tube body 23, and the deformation block 31 can absorb water and expand.

[0064] A third slide groove 24 is provided between the inner wall of the first tube body 23 and the connecting sleeve 25 and is opened along the axial direction of the first tube body 23. A first stopper 26 is provided at the first end of the first needle 22. A second stopper extends inward from the first end of the first tube body 23. The first rod section 29 extends out of the connecting sleeve 25 and is connected to the second rod section 30. The first stopper 26 and the second stopper cooperate to prevent the first needle 22 from sliding out of the third slide groove 24. The present invention provides a fourth slide groove in the axial direction of the connecting sleeve 25. The first rod section 29 slidably cooperates with the fourth slide groove, so that when the push-pull rod moves, it moves axially along the fourth slide groove, driving the first needle 22 to axially extend and retract.

[0065] Furthermore, the present invention further provides a rubber sleeve 27 which is elastic and can undergo elastic deformation at the first end of the first tube body 23. The rubber sleeve 27 is connected to the first end of the first tube body 23 and extends in a direction away from the first end of the first tube body 23. The cross-section of the rubber sleeve 27 is annular. When the first needle 22 extends a short length out of the first tube body 23, the rubber sleeve 27 is located on the outside of the first needle 22. Based on the setting of the rubber sleeve 27, after the operator completes the puncture operation with the first needle 22 and reaches the lesion area, the first needle 22 may not be completely retracted into the first tube body 23, but retracted into the rubber sleeve 27. At this time, the axial length of the first needle 22 exposed outside the first tube body 23 is less than the axial length of the rubber sleeve 27. Since the rubber sleeve 27 isolates the first needle 22 from the tissue cells, the first needle 22 will not cause damage to the tissue cells.

[0066] A first annular gap 28 is provided between the first needle 22 and the rubber sleeve 27 , which provides sufficient space for deformation of the rubber sleeve 27 .

[0067] Furthermore, the present invention also provides a deformation block 31 that can expand after encountering blood on one side of the first stopper 26 close to the first end of the first tube body 23. The deformation block 31 can specifically be a water-absorbing resin. When the deformation block 31 encounters blood, it will absorb moisture therein and expand and deform.

[0068] When the first needle 22 is puncturing, the operator pushes the push-pull rod outward, so that the first needle 22 extends out of the first tube 23 by the required length. When blood enters the third chute 24 through the gap between the first needle 22 and the connecting sleeve 25, and contacts the deformation block 31 through the gap between the third chute 24 and the first stopper 26, the deformation block 31 will absorb water and expand, pushing the second stopper. Under the reaction force of the second stopper, the deformation block 31 will drive the first stopper 26 to move toward the inside of the first tube 23, thereby achieving the retraction of the first needle 22. In the process of the first needle 22 puncturing the skin and entering the lesion area, the first tube 23 will pass through the skin with the first needle 22 and enter the lesion area. It can be understood that after the first needle 22 punctures the skin, the first tube 23 squeezes into the channel punctured by the first needle 22 under the continuous push of the operator, and then moves toward the lesion area along the channel punctured by the first needle 22.

[0069] The deformation block 31 is suitable for the case where the puncture distance of the first needle 22 is short, so as to prevent the first needle 22 from being pushed inward by the deformation block 31 and retracting into the first tube 23 before completing the puncture operation and reaching the lesion area.

[0070] The second telescopic component in the present invention has a variety of configurations.

[0071] like Figure 1As shown, the second telescopic component includes: a first slide groove 1, the first slide groove 1 is opened along the axial direction of the second tube body 5, and the distance between the second end of the first slide groove 1 and the first end of the second tube body 5 is not less than the length of the second needle 4; a telescopic switch 2, the telescopic switch 2 is slidably matched with the first slide groove 1, the first end of the telescopic switch 2 extends out of the first slide groove 1 to form a control part, and the second end of the telescopic switch 2 extends into the second tube body 5 and is connected to the second needle 4.

[0072] By sliding the telescopic switch 2 toward the end of the first slide 1 away from the second needle 4, i.e., the distal end, the second needle 4 is driven to move toward the outside of the second tube 5, so that the second needle 4 extends out of the second tube 5, and during the injection process, the control part needs to be continuously pressed to prevent the second needle 4 from retracting. Among them, the distance between the second end of the first slide 1 and the first end of the second tube 5 is not less than the length of the second needle 4, so that when the telescopic switch 2 is slid to the second end of the first slide 1, the second needle 4 can be completely retracted into the second tube 5. The first end of the first slide 1 refers to the end of the first slide 1 close to the needle tip of the second needle 4, i.e., the distal end of the first slide 1, and the second end of the first slide 1 refers to the end of the first slide 1 away from the needle tip of the second needle 4, i.e., the proximal end of the first slide 1. Among them, "proximal end" refers to the operating end or the end close to the outside of the body, and the distal end refers to the end deep into the body.

[0073] Alternatively, the second telescopic assembly may not adopt the above structure, such as Figure 2 As shown, at this time, the second telescopic assembly includes: a first locking member 6, which is located on the inner wall of the second tube body 5 and is opened along the axial direction of the second tube body 5; a second slide groove, which is opened along the axial direction of the second tube body 5; a switch 7, which is slidably matched with the second slide groove, the first end of the switch 7 extends out of the second tube body 5 and forms a button, the second end of the switch 7 extends into the second tube body 5, and the side of the switch 7 extends along the axial direction of the second tube body 5 with a second locking member 8 matched with the first locking member 6, and the second locking member 8 is located inside the second tube body 5; at least two switches 7 are provided, and are evenly distributed along the circumference of the second tube body 5, and a first elastic member 9 is provided between the second locking member 8 and the second needle 4. The first elastic member 9 is arranged along the radial direction of the second tube body 5.

[0074] The first locking member 6 cooperates with the second locking member 8, and the first locking member 6 and the second locking member 8 can be specifically engaged with each other. The first locking member 6 and the second locking member 8 are arranged so that when the second needle 4 stops at any position, the position of the second needle 4 can be fixed by the cooperation of the first locking member 6 and the second locking member 8, so that the operator does not need to manually fix the position of the second needle 4, thereby freeing the operator's hands and reducing the operator's work intensity. When the operator presses the switch 7 inward, since there are at least two switches 7 and the switches 7 are evenly distributed along the second tube 5, after the operator presses the switch 7, the second needle 4 can be uniformly stressed in the radial direction, and the second needle 4 will not be offset or skewed along a certain radial direction, so that when the operator moves the second needle 4 through the switch 7, the needle tip of the second needle 4 will not abut against the inner wall of the second tube 5, avoiding the problem that the second needle 4 cannot extend from the second tube 5.

[0075] When the second needle 4 is not moved, the first locking member 6 is engaged with the second locking member 8 under the action of the first elastic member 9, so that the switch 7 cannot move along the second slide groove, that is, the position of the second needle 4 is fixed and cannot be moved at this time; when the second needle 4 needs to be moved, the button is pressed in the direction of the inside of the second tube 5 to compress the first elastic member 9, so that the first locking member 6 disengages from the second locking member 8, and the button is kept pressed inward, and the switch 7 is moved along the second slide groove, so that the second needle 4 continues to emerge from the second tube 5 until the length of the second needle 4 extending from the second tube 5 reaches the set length; after the second needle 4 extends out to the set length, the button is released, and the first locking member 6 is engaged with the second locking member 8 under the action of the first elastic member 9, thereby forming a limit on the position of the second needle 4.

[0076] Furthermore, the second telescopic assembly further includes: a guide member, the guide member includes a guide rod 10 and a guide groove opened along the radial direction of the second tube body 5, the guide rod 10 is located on the second needle 4, the guide groove is located at the second end of the switch 7 and opened along the radial direction of the switch 7; the guide groove is slidably matched with the guide rod 10. The arrangement of the guide rod 10 and the guide groove enables the first elastic member 9 between the switch 7 and the second needle 4 to be compressed along the axial direction of the first elastic member 9 without being skewed, which not only avoids the problem that the second needle 4 abuts against the second tube body 5 and cannot extend from the second tube body 5, but also avoids the problem that the first elastic member 9 is tilted and compressed relative to the axial direction of the first elastic member 9 and contacts with the surrounding structure to produce abnormal noise.

[0077] like Figure 2As shown, the second telescopic assembly in the present invention further includes a support plate 11, which is opened along the radial direction of the second tube body 5, and the second needle 4 is arranged to avoid the support plate 11; a needle tube seat 12, which is sleeved on the second needle 4, and a second elastic member 13 is arranged between the needle tube seat 12 and the support plate 11, and the second elastic member 13 is arranged along the axial direction of the second tube body 5. The support plate 11 is provided with a through hole for the second needle 4 to pass through. After the switch 7 is pressed inward, the first locking member 6 disengages from the second locking member 8. At this time, the switch 7 is kept pressed, so that the first locking member 6 and the second locking member 8 will not engage or clamp together before the second needle 4 extends out of the second tube 5 to the required length. After the first locking member 6 disengages from the second locking member 8, the second elastic member 13 is no longer limited by the first locking member 6 and the second locking member 8. The second needle 4 can move along the second slide groove toward the first end of the second tube 5 under the action of the second elastic member 13. At the same time, the operator continues to push the switch 7 along the second slide groove until the second needle 4 extends out to the required length. With the assistance of the second elastic member 13, the force expended by the operator in adjusting the extension length of the second needle 4 is reduced, so that the operator can achieve the smooth removal of the second needle 4 with less effort, and the range of people who can operate the drug delivery device of the present invention is increased.

[0078] Furthermore, the second telescopic assembly of the present invention further includes: a first stopper 14, the first stopper 14 is located in the second tube 5, and the first stopper 14 is used to prevent the second needle 4 from being separated from the second tube 5. The first stopper 14 can be a first stopper plate with a circular ring shape in longitudinal section, and a hole for the second needle 4 to pass through is provided on the first stopper plate, such as Figure 2 As shown, the side of the switch 7 is provided with a first positioning plate extending along the axial direction of the second tube 5, and the first positioning plate is located inside the second tube 5, and the first positioning plate matches the first limiting plate: when the length of the second needle 4 extending outward reaches the limit value (the limit value means that the second needle 4 will completely extend out of the second tube 5 when it continues to extend outward), the first positioning plate will abut against the first limiting plate, so that the second needle 4 cannot extend outward. In addition, when the length of the second needle 4 extending outward reaches the limit value, the end of the needle tube seat 12 close to the needle tip of the second needle 4 will also abut against the first end of the second tube 5, preventing the second needle 4 from continuing to extend. It can be seen that the present invention can stop the second needle 4 from extending outward in time when the length of the second needle 4 extending outward reaches the limit value through the cooperation of the first positioning plate and the first limiting plate, and the cooperation of the needle tube seat 12 and the second tube 5, thereby avoiding the problem that the operator needs to spend extra time to adjust the second needle 4 due to the second needle 4 completely extending out of the second tube 5.

[0079] In addition, the second telescopic assembly in the present invention may not adopt the above structure, such as Figure 3As shown, at this time, the first end of the second tube body 5 is provided with a first baffle 15; the second telescopic assembly includes: the first end of the second tube body 5 is provided with a first baffle 15; an operating rod 21, the first end of the operating rod 21 is connected to the end of the second needle 4 away from the needle tip, the second end of the operating rod 21 extends out of the second tube body 5, and the operating rod 21 and the second needle 4 are both rotatably connected to the second tube body 5; the second telescopic assembly includes: a limit plate 16; the limit plate 16 is sleeved on the second needle 4; a third elastic member 17, the third elastic member 17 is sleeved on the second needle 4, and is located between the first baffle 15 and the limit plate 16; a positioning member, a plurality of positioning members are arranged along the axial direction of the second tube body 5, and are located in the second tube body 5, and the positioning member and the limit plate 16 form a rotation limit fit in the axial direction of the second tube body 5.

[0080] When the second needle 4 is completely located in the second tube body 5 and the second needle 4 needs to be extended out of the second tube body 5, the operator can rotate the operating rod 21 so that the positioning member releases the limit plate 16, and no longer axially limits the limit plate 16, and moves the operating rod 21 in the direction of the third elastic member 17 until the second needle 4 extends out of the second tube body 5 by a required length. After the second needle 4 extends out of the second tube body 5 by a required length, the operating rod 21 is rotated again so that the positioning member located on the same end face or adjacent to the limit plate 16 blocks the limit plate 16, and the axial limit of the limit plate 16 is restored. The second needle 4 can be moved axially to fix the position of the second needle 4; when the second needle 4 needs to be retracted into the second tube 5, the operating rod 21 is rotated to release the blocking of the limiting plate 16 by the positioning member, so that the limiting plate 16 and the second needle 4 can move axially along the second tube 5 until the second needle 4 is retracted into the second tube 5, and the operating rod 21 is rotated again, so that the positioning member located on the same end face or adjacent to the limiting plate 16 blocks the limiting plate 16, and the axial limit of the limiting plate 16 is restored, and the axial movement of the limiting plate 16 and the second needle 4 is blocked by the positioning member, so as to fix the position of the second needle 4. The position and number of the positioning members can be set as needed.

[0081] It should be noted that: in the present invention, the third elastic member 17 is sleeved on the second needle 4, and the third elastic member 17 is not connected to the second needle 4; the limiting plate 16 is fixed on the second needle 4; and the first baffle 15 is fixed to the first end of the second tube 5. The positioning member and the limiting plate 16 can be a fan-shaped plate, a rectangular plate or an annular plate, and the number of the positioning member and the limiting plate 16 can be only one or more. However, regardless of the number and shape of the positioning member and the limiting plate 16, the positioning member and the limiting plate 16 in the present invention both meet the condition that "when the limiting plate 16 is aligned with the positioning member, the positioning member can block the limiting plate 16 from moving along the axial direction of the second needle 4, and when the limiting plate 16 is rotated so that the limiting plate 16 is not aligned with the positioning member, the positioning member releases the blocking of the limiting plate 16, and the limiting plate 16 can move along the axial direction of the second tube 5". This condition is also an explanation for the rotational limiting cooperation between the positioning member and the limiting plate 16 in the axial direction of the second tube 5 in the present invention.

[0082] When the positioning piece is set to be annular, the limiting plate 16 is also annular, the diameter of the limiting plate 16 is smaller than the inner diameter of the positioning piece, and a second baffle extending radially along the second tube body 5 is provided on the limiting plate 16, and the positioning piece is provided with a channel matching the second baffle. When the second baffle is aligned with the channel, the limiting plate 16 can pass through the positioning piece and move along the axial direction of the second tube body 5, thereby realizing the adjustment of the extension length of the second needle 4; when the second baffle is not aligned with the channel, the positioning piece blocks the limiting plate 16, so that the limiting plate 16 cannot pass through the positioning piece, thereby realizing the fixation of the position of the second needle 4.

[0083] Specifically, Figure 3 As shown, the positioning member includes a plurality of positioning plates 18 provided along the axial direction of the second tube body 5. When the limiting plate 16 is on the side of the positioning plate 18 away from the third elastic member 17, if the limiting plate 16 is aligned with the positioning plate 18, the positioning plate 18 will block the limiting plate 16 from moving along the axial direction of the second tube body 5. If the limiting plate 16 is not aligned with the positioning plate 18, the positioning plate 18 will not block the limiting plate 16 from moving along the axial direction of the second tube body 5, and the limiting plate 16 can move smoothly along the axial direction of the second tube body 5.

[0084] Furthermore, a positioning groove 19 can be provided in the positioning plate 18, and a positioning opening 20 connected to the positioning groove 19 can be provided on the side of the positioning plate 18. At this time, the positioning plate 18 has two ways to block the limiting plate 16. The limiting plate 16 can be aligned with the positioning plate 18 and the limiting plate 16 is not rotated into the positioning groove 19. The axial movement of the limiting plate 16 along the second tube body 5 is blocked by the outer side of the positioning plate 18. The limiting plate 16 can also be rotated into the positioning groove 19 through the positioning opening 20. The axial movement of the limiting plate 16 along the second tube body 5 is blocked by the inner side of the positioning plate 18.

[0085] It should also be noted that if multiple positioning members are set along the axial direction of the second tube body 5, and the positioning members are rectangular plates or fan-shaped plates, each positioning member must be set one by one so that the limit plate 16 can move smoothly along the axial direction of the second tube body 5 without being blocked one by one by multiple positioning members.

[0086] The first elastic member 9 , the second elastic member 13 and the third elastic member 17 may specifically be springs or other structures with elastic force.

[0087] In addition, the first end of the first tube body 23 and the first end of the second tube body 5 in the present invention can also be flat ends. The flat ends make it less likely to cause damage to tissue cells when the first tube body 23 and the second tube body 5 are adjusted in position or approaching the lesion area.

[0088] And / or, in the present invention, the second tube body 5 is a flexible tube, and the axial length of the second tube body 5 is greater than the axial length of the first tube body 23, which enables the second tube body 5 to better meet the operation requirements and reach the lesion area at different positions according to the operator's operation.

[0089] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A drug delivery device with precise dosing and adjustable injection depth, characterized in that: include: A first tube body, wherein a first needle is disposed in the first tube body, and the first needle is slidably matched with the first tube body in the axial direction of the first tube body; The first needle head has a first accommodating cavity therein; A first telescopic assembly, the first telescopic assembly is located on the first needle head, and the first telescopic assembly is used to drive the first needle head to extend out and retract into the first tube body; A second tube body, wherein a first end of the second tube body has a second needle, and a second end of the second tube body is connected to a drug delivery assembly; The drug delivery assembly includes a syringe pump, the input end of the syringe pump is connected to a drug solution storage tank, and the output end of the syringe pump is connected to the second end of the second tube body; A second telescopic assembly, the second telescopic assembly is located on the second tube body, the second telescopic assembly is used to drive the second needle to extend and retract into the second tube body, and the second telescopic assembly can limit the position of the second needle, so that when the second needle is in use, it extends a set length without being retracted into the second tube body, and when the second needle is not in use, it can be retracted into the second tube body; The first accommodating cavity is used to be sleeved on the outer side of the second tube body; The first telescopic component comprises: A push-pull rod, the push-pull rod comprising a first rod segment and a second rod segment, the first end of the first rod segment is connected to the side of the first needle, the second end of the first rod segment is connected to the first end of the second rod segment, the second end of the second rod segment extends out of the second tube, and the first rod segment and the second rod segment are arranged vertically; And / or, the first telescopic component further includes: A first blocking member, which is sleeved on the first end of the first needle and extends outwardly in the radial direction of the first needle; A second stopper, the second stopper is located at the first end of the first tube and extends radially inwardly along the first tube; a third stopper, the third stopper being located at the second end of the first tube body and extending radially inwardly along the first tube body; A connecting sleeve, the connecting sleeve is located on the inner side of the first tube body and extends along the axial direction of the first tube body, the side of the first end of the connecting sleeve is connected to the second stopper, the second end of the connecting sleeve is connected to the side of the third stopper facing the second stopper, the connecting sleeve, the second stopper, the third stopper and the inner side of the first tube body form a third slide groove, and the third slide groove is arranged along the axial direction of the first tube body; A deformation block, the deformation block is located on a side of the first blocking member close to the first end of the first tube body, and the deformation block can absorb water and expand; The second telescopic assembly comprises: A first locking member, the first locking member is located on the inner wall of the second tube body and is opened along the axial direction of the second tube body; a second slide groove, the second slide groove being opened along the axial direction of the second tube body; A switch, wherein the switch is slidably matched with the second slide groove, the first end of the switch extends out of the second tube body to form a button, the second end of the switch extends into the second tube body, the side of the switch is provided with a second locking member matched with the first locking member extending along the axial direction of the second tube body, and the second locking member is located inside the second tube body; At least two switches are provided and are evenly distributed along the circumference of the second tube body. A first elastic member is provided between the second locking member and the second needle.

2. The drug delivery device according to claim 1, characterized in that: The second telescopic assembly comprises: a first slide groove, the first slide groove is opened along the axial direction of the second tube body, and the distance between the second end of the first slide groove and the first end of the second tube body is not less than the length of the second needle; A telescopic switch, wherein the telescopic switch is slidably matched with the first slide groove, the first end of the telescopic switch extends out of the first slide groove to form a control portion, and the second end of the telescopic switch extends into the second tube body and is connected to the second needle.

3. The drug delivery device according to claim 1, characterized in that: An ultrasonic viewing tube, the ultrasonic viewing tube is located inside the first accommodating cavity; And / or, an anti-slip portion is provided on the second end of the first tube body and the second end of the second tube body.

4. The drug delivery device according to claim 1, characterized in that: The second telescopic assembly further includes: a guide member, which includes a guide rod and a guide groove opened along the radial direction of the second tube body, the guide rod is located on the second needle head, and the guide groove is located at the second end of the switch.

5. The drug delivery device according to claim 1, characterized in that: The second telescopic assembly further comprises a support plate, the support plate is provided along the radial direction of the second tube body, and the second needle head is arranged to avoid the support plate; A needle tube seat is sleeved on the second needle head, a second elastic member is provided between the needle tube seat and the support plate, and the second elastic member is arranged along the axial direction of the second tube body.

6. The drug delivery device according to claim 5, characterized in that: The second telescopic assembly also includes: A first limiting member is located in the second tube body, and is used to prevent the second needle from being separated from the second tube body.

7. The drug delivery device according to claim 1, characterized in that: A first baffle is provided at the first end of the second tube; An operating rod, wherein a first end of the operating rod is connected to an end of the second needle head away from the needle tip, a second end of the operating rod extends out of the second tube body, and the operating rod and the second needle head are both rotatably connected to the second tube body; The second telescopic assembly comprises: A limiting plate; the limiting plate is sleeved on the second needle head; a third elastic member, the third elastic member being sleeved on the second needle head and located between the first baffle plate and the limiting plate; A plurality of positioning members are arranged along the axial direction of the second tube body and are located inside the second tube body. The positioning members and the limiting plate form a rotation limiting fit in the axial direction of the second tube body.

8. The drug delivery device according to claim 1, characterized in that: The first end of the first tube is a flat end; And / or, the second tube body is a flexible tube, and the axial length of the second tube body is greater than the axial length of the first tube body.

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