Dosing device with tube head convenient to replace

Abstract

The invention provides a drug delivery device with a tube head convenient to replace, and relates to the technical field of drug delivery devices, the drug delivery device comprises a fixing seat and a fixing ring which are installed on an extending section, a compensation ring is installed on the fixing ring, two-way sleeves are connected to the compensation ring, a rubber sleeve is installed between the two-way sleeves, and the rubber sleeve is connected to the two-way sleeves. A plurality of inclined grooves are symmetrically formed in the fixing base, a same-direction block is connected into each inclined groove in a sliding mode, an elastic rod is installed on each same-direction block, and the elastic rods are fixedly connected to the outer walls of the two two-way sleeves respectively. According to the design, an active extrusion sealing structure with the combination of the rubber sleeve and the two-way sleeve is adopted, and after an operator inserts a new pipe head into the device, the rotating operation converts rotating force into radial compression force through the transmission mechanism, so that the rubber sleeve uniformly shrinks centripetally, and all-directional wrapping and pressing of the pipe head are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of drug dispensing devices, and more particularly to a drug dispensing device with a convenient tube head replacement. Background Art

[0002] In today's rapidly developing field of medical devices, applicators are important tools for clinical medication and home medical care. Their design and use safety are directly related to the patient's treatment effect and physical health. Applicators in the existing technology generally use a simple clip-on method to achieve rapid replacement and installation of the tube head. The original intention of this design is to improve the operating efficiency of medical staff and the convenience of use for patients. Common clip-on structures usually use the friction between the inner wall of the tube head and the outer wall of the applicator body or a simple cam slot mechanism to form a temporary connection, so that the operator can complete the installation and removal of the tube head through simple actions such as rotation or pushing and pulling. This clip-on method does simplify the operation process of the applicator to a certain extent and shortens the time for replacing the tube head. However, this connection method that relies solely on surface friction or simple mechanical clipping force has an inherent problem of insufficient structural stability. Its reliability is highly dependent on the contact area and material properties between the tube head and the body. Once the material ages, wears or is contaminated during use, the connection strength will be significantly reduced.

[0003] This simple friction-based clip-on fixation method faces severe safety challenges in actual medical environments. In particular, when the drug delivery device encounters unexpected external vibration or impact during use, the stability of the tube head will be directly threatened. Common situations such as people walking, equipment moving, or patients' own activities in medical facilities may generate sufficient vibration energy to break through the weak connection interface formed by friction, causing the tube head to loosen accidentally or even fall off completely. This risk of falling off may cause a series of serious consequences in specific medication scenarios: accidental leakage of liquid drugs not only causes drug waste and environmental pollution, but may also lead to insufficient dosage for patients; if the tube head falls off during high-pressure injection, the high-pressure sprayed liquid may cause skin damage or eye damage to patients or medical staff; for the infusion of specific drugs such as insulin, chemotherapy drugs, or cardiotonic drugs and other critical therapeutic drugs, interruption of drug delivery may cause fluctuations in the patient's condition or treatment failure; more seriously, in intravenous injection or implantable drug delivery systems, the falling of the tube head may introduce air embolism or infection risks, and even endanger the patient's life safety. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a drug dispensing device that is convenient for replacing the tube head, so as to solve the technical problems mentioned in the background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a drug dispenser that is convenient for replacing a tube head, comprising a tube body and a piston rod slidably connected in the tube body, and an extension section is installed on the tube body; it also includes a fixing mechanism, the fixing mechanism includes a fixing seat and a fixing ring installed on the extension section, a compensation ring is installed on the fixing ring, a two-way sleeve is connected to the compensation ring, two two-way sleeves are provided, and a rubber sleeve is installed between the two two-way sleeves, a plurality of inclined grooves are symmetrically opened in the fixing seat, each of the inclined grooves is slidably connected with a same-direction block, each of the same-direction blocks is respectively installed with an elastic rod, and the plurality of elastic rods are respectively fixedly connected to the outer walls of the two two-way sleeves, a sealing head is fitly installed in the extension section, and the rubber sleeve is pressed on the sealing head; it also includes an adjustment mechanism, the adjustment mechanism includes two two-way holes opened on the extension section, and a control rod is slidably connected in each of the two-way holes.

[0006] Preferably, the fixing mechanism also includes an adjusting sleeve that is limitedly rotatably connected to the fixing seat, and a plurality of the same-direction blocks are symmetrically provided with follower grooves, and double-cone bars are symmetrically arranged in the adjusting sleeve, and the double-cone bars are engaged in the follower grooves. This precise double-cone bar and follower groove engagement design realizes an efficient conversion of rotational force to linear thrust, ensuring that the same-direction blocks can move synchronously along the inclined groove when the adjusting sleeve is rotated, generating a uniform centripetal contraction force, and providing all-round and stable clamping for the pipe head.

[0007] Preferably, a plurality of pressure grooves are symmetrically provided in the fixing seat, and a pressure rod is installed on each of the unidirectional blocks respectively, and the pressure rod is sealingly and slidingly connected in the pressure groove. This sealed sliding pressure rod structure can compress the air in the pressure groove to form an additional pressure source during the movement of the unidirectional block, thereby enhancing the sealing effect and constructing an air pressure-assisted locking system.

[0008] Preferably, a plurality of vertical grooves are provided on the fixing seat, and every two symmetrically arranged pressurized grooves are connected in the vertical grooves, a push rod is slidably connected in the vertical grooves, a return spring is installed on the push rod, and the return spring is connected in the pressurized grooves. This combination of vertical grooves and push rods converts the energy of the compressed gas into uniform radial pressure on the rubber sleeve.

[0009] Preferably, the plurality of push rods respectively abut against the outer wall of the rubber sleeve, the two bidirectional sleeves respectively fit on the sealing head, and the bidirectional sleeves are provided with flares. This multi-point supported push rod layout and flare guide design form a complete three-dimensional sealing pressure network. The flare not only facilitates the quick and accurate insertion of the pipe head, but also creates a double-layer sealing barrier through the fitting action of the bidirectional sleeves.

[0010] Preferably, the adjustment mechanism includes a spring installed between the two control rods, and each control rod is provided with a round head away from the spring. This spring-connected double control rod design creates an adjustable flow resistance system, which controls the flow rate of the liquid medicine by changing the distance between the control rods. The round head structure ensures smooth contact and precise positioning with the variable pitch slot, providing an ideal drug delivery rate for various types of drugs.

[0011] Preferably, two side panels are installed on the extended section, a rotating sleeve is fitted between the two side panels, a sealing ring is installed on each side panel, and the sealing ring is inserted into the side wall of the rotating sleeve. This rotating sleeve structure supported by two side panels provides a stable operating platform, and the insertion design of the sealing ring ensures that there will be no liquid or gas leakage during the rotation process.

[0012] Preferably, two variable pitch grooves are symmetrically provided on the inner wall of the rotating sleeve, and the two round heads respectively abut against the two variable pitch grooves. This innovative design of the variable pitch groove and the round head cleverly converts the rotational motion into a linear adjustment of variable pitch. As the rotating sleeve rotates, the position change of the round head in the variable pitch groove directly adjusts the distance between the control rods, thereby accurately controlling the flow channel resistance.

[0013] Preferably, a plurality of indicator lines are provided at equal intervals on the outer wall of the rotating sleeve, and scale lines are provided on the side panel. This intuitive scale indicator system provides clear visual feedback to the operator, enabling medical staff to accurately grasp the current flow setting status.

[0014] Preferably, two handles are mounted on the side walls of the tube body. This ergonomic double-handle design provides a stable and comfortable gripping point.

[0015] Compared with the prior art, the present invention provides a drug dispenser that is convenient for replacing the tube head, which has the following beneficial effects: The technical advantage of this innovatively designed applicator lies in its unique multiple sealing mechanism, which solves the instability problem caused by traditional applicators relying solely on friction to fix the tube head. The design adopts an active extrusion sealing structure composed of a rubber sleeve and a two-way sleeve. When the operator inserts the new tube head into the device, he only needs to simply rotate the adjustment device to activate the entire sealing system. This rotation operation converts the rotational force into radial compression force through the transmission mechanism, causing the rubber sleeve to shrink centripetally evenly, forming an all-round wrapping and compression of the tube head. Unlike traditional single contact point fixation, this wrap-around seal forms a continuous high-pressure sealing belt around the tube head, increasing the contact area and friction, and maintaining a firm connection even in severe vibration environments, effectively preventing the risk of accidental detachment of the tube head.

[0016] The drug dispenser controls and adjusts the fixing pressure of the tube head through a unique bevel guide structure and an elastic force transmission element. When the operator turns the adjustment device, the unidirectional block inside the device contracts under the guidance of the bevel, and transmits the force to the bidirectional sleeve through the elastic rod, forming a centripetal extrusion force. The device integrates a compensation ring design, which can adapt to the expansion and contraction of the bidirectional sleeve, ensure the uniform distribution of sealing pressure, and avoid local overpressure or underpressure. On the basis of the basic seal, an air pressure auxiliary sealing mechanism is added. When the main seal is started, the compressed air in the internal air chamber applies additional uniform pressure to the rubber sleeve through the push rod, forming a double sealing protection. This multiple sealing strategy ensures that a reliable connection effect can be maintained even under long-term use, thereby improving the safety and reliability of the medical drug delivery process. This drug delivery device achieves stepless adjustment and precise control of the drug delivery flow rate through a variable pitch slot design and a double control rod structure. The operator only needs to rotate the external rotating sleeve to change the spacing between the internal control rods, thereby precisely adjusting the flow resistance and drug delivery rate. This design not only meets the special flow rate requirements of different drugs and treatment plans, but also can be personalized according to individual patient differences, thereby improving drug delivery accuracy and treatment effects. The device uses an intuitive visual indication system. Through clear external scale lines and indicator marks, medical staff can intuitively see the current resistance setting status, avoiding drug delivery errors caused by inaccurate visual estimation and improving operational safety. This controllable drug delivery system has particularly important clinical value for drugs that require controlled drug delivery rate, such as anesthetics, chemotherapy drugs or high-concentration electrolyte solutions.

[0017] From the perspective of long-term benefits, the application of this innovative drug delivery device will bring significant economic benefits and safety improvements. Its reliable sealing system and stable connection mechanism effectively reduce the risk of drug leakage and tube head detachment, reduce drug waste and environmental pollution, and avoid related medical accidents and potential legal risks. The precisely adjustable flow control system ensures the accuracy of drug dosage, improves the treatment effect, and reduces the incidence of adverse drug reactions. The quick and convenient tube head replacement mechanism saves medical staff's operating time and improves work efficiency. It has obvious value in a busy medical environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a drug dispensing device that is convenient for replacing the tube head in the present invention; Figure 2 Schematic diagram of the cross-sectional structure of the extension section and the adjustment sleeve in the present invention; Figure 3 Schematic diagram of the cross-sectional structure of the extension section and the rubber sleeve in the present invention; Figure 4 Schematic diagram of the structure of the rotating sleeve and the control rod in the present invention; Figure 5 Schematic diagram of the cross-sectional structure of the fixing seat and the adjusting sleeve in the present invention; Figure 6 For the present invention Figure 5 A partial enlarged view of middle A; Figure 7 Schematic diagram of the cross-sectional structure of the rubber sleeve and the fixing seat in the present invention; Figure 8 It is a structural diagram of the bidirectional sleeve and the same-direction block in the present invention; Figure 9 Schematic diagram of the cross-sectional structure of the fixing seat in the present invention; Figure 10 It is a schematic cross-sectional structural diagram of the adjustment sleeve in the present invention.

[0019] In the figure: 11. Tube body; 12. Piston rod; 13. Extension section; 21. Fixed seat; 22. Fixed ring; 23. Compensating ring; 24. Bidirectional sleeve; 25. Rubber sleeve; 26. Inclined groove; 27. Same-direction block; 28. Elastic rod; 29. Sealing head; 31. Bidirectional hole; 32. Control rod; 33. Spring; 34. Round head; 35. Side plate; 36. Rotating sleeve; 37. Sealing ring; 38. Pitch-changing groove; 39. Indicator line; 210. Adjusting sleeve; 211. Follow-up groove; 212. Double tapered strip; 213. Pressurizing groove; 214. Pressurizing rod; 215. Vertical groove; 216. Push rod; 217. Return spring; 218. Flaring; 310. Scale line; 311. Handle. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0022] In the present invention, unless otherwise specified, directions such as "up" and "down" are generally used with respect to the directions shown in the drawings, or with respect to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" are generally used with respect to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0023] See also Figures 1 to 10, a drug dispensing device for convenient replacement of the tube head, comprising a tube body 11 and a piston rod 12 slidably connected to the tube body 11, and an extension section 13 is installed on the tube body 11; it also includes a fixing mechanism, the fixing mechanism comprising a fixing seat 21 and a fixing ring 22 installed on the extension section 13, a compensation ring 23 is installed on the fixing ring 22, a two-way sleeve 24 is connected to the compensation ring 23, two two-way sleeves 24 are provided, and a rubber sleeve 25 is installed between the two two-way sleeves 24, a plurality of inclined grooves 26 are symmetrically opened in the fixing seat 21, each inclined groove 26 is respectively slidably connected with a same-direction block 27, each same-direction block 27 is respectively installed with an elastic rod 28, and a plurality of elastic rods 28 are respectively fixedly connected to the outer walls of the two two-way sleeves 24, a sealing head 29 is fitted in the extension section 13, and the rubber sleeve 25 is pressed on the sealing head 29, and the fixing mechanism also includes a limited rotation connection on the fixing seat The adjusting sleeve 21 is provided with an adjusting sleeve 210 in the 21, and multiple unidirectional blocks 27 are symmetrically provided with follower grooves 211. Double tapered strips 212 are symmetrically provided in the adjusting sleeve 210, and the double tapered strips 212 are engaged in the follower groove 211. Multiple pressure grooves 213 are symmetrically provided in the fixed seat 21, and a pressure rod 214 is installed on each unidirectional block 27. The pressure rod 214 is sealingly and slidingly connected in the pressure groove 213. Multiple vertical grooves 215 are provided on the fixed seat 21, and every two symmetrically arranged pressure grooves 213 are connected in the vertical groove 215. A push rod 216 is slidably connected in the vertical groove 215, and a return spring 217 is installed on the push rod 216. The return spring 217 is connected to the pressure groove 213. Multiple push rods 216 respectively contact the outer wall of the rubber sleeve 25, and the two bidirectional sleeves 24 are respectively fitted on the sealing head 29, and the bidirectional sleeve 24 is provided with a flare 218.

[0024] Since the corresponding pipe head is installed on the sealing head 29, when the pipe needs to be replaced, only the sealing head 29 needs to be replaced. First, the new sealing head 29 is inserted between the rubber sleeve 25 and the two-way sleeve 24 along the flared opening 218, so that the sealing head 29 fits on the protruding section 13, and then the adjusting sleeve 210 is rotated. The adjusting sleeve 210 is symmetrically installed with double tapered strips 212. The symmetrically arranged double tapered strips 212 are respectively threadedly connected to multiple follower grooves 211. Due to the symmetrical arrangement, the multiple unidirectional blocks 27 on both sides will move in the same direction respectively. Since the unidirectional blocks 27 are slidably connected in the inclined groove 26, the unidirectional blocks 27 on both sides will approach the notification along the inclined groove 26 and shrink toward the axis. Since the elastic rod 28 is installed on the unidirectional block 27, since the two-way sleeve 24 will not change, the elastic rod 28 will convert the thrust into The thrust of the two double-line sleeves approaches each other, and at this time the two bidirectional sleeves 24 will squeeze the rubber sleeve 25, thereby driving the rubber sleeve 25 to shrink toward the axis. Since the fixed ring 22 is sealed and connected to the extended section 13, the fixed ring 22 and the extended section 13 are in a sealed state. When the bidirectional sleeve 24 is moving, the compensation ring 23 will compensate for the expansion and contraction, so the rubber sleeve 25 will fit on the sealing head 29. As the thrust becomes greater and greater, an effective seal is guaranteed. When the rubber sleeve 25 and the sealing head 29 are in the sealed state, the distance between the extended section 13 and the rubber sleeve 25 is in a sealed state, thereby completing the sealing process. A simple description is to insert the sealing head 29 into the extended section 13, and rotate the adjusting sleeve 210 to fit the rubber sleeve 25 on the sealing head 29 to seal it, thereby completing the sealing process.

[0025] As the two unidirectional blocks 27 approach each other, the pressure rods 214 on both sides slide along the pressure groove 213, compressing the air in the pressure groove 213 and the vertical groove 215. At this time, the push rod 216 is pushed outward to press against the rubber sleeve 25. Therefore, not only is the seal achieved through the extrusion of the rubber sleeve 25, but the sealing effect can also be further enhanced by the pressure of multiple push rods 216, ensuring that there will be no leakage during use.

[0026] The adjustment mechanism includes two bidirectional holes 31 provided on the extension section 13, and a control rod 32 is slidably connected in each bidirectional hole 31. The adjustment mechanism includes a spring 33 installed between the two control rods 32, and each control rod 32 is provided with a round head 34 at a position away from the spring 33. Two side plates 35 are installed on the extension section 13, and a rotating sleeve 36 is fitted between the two side plates 35. A sealing ring 37 is installed on each side plate 35, and the sealing ring 37 is inserted into the side wall of the rotating sleeve 36. Two variable pitch grooves 38 are symmetrically provided on the inner wall of the rotating sleeve 36, and the two round heads 34 respectively abut against the two variable pitch grooves 38. A plurality of indicator lines 39 are equally spaced on the outer wall of the rotating sleeve 36, and a scale line 310 is provided on the side plate 35. Two handles 311 are installed on the side wall of the tube body 11.

[0027] When using the applicator for injection, the tightness of the pressure applied by the piston rod 12 needs to be adjusted according to different situations. Since the round heads 34 are respectively in contact with the variable pitch grooves 38, the distance between the two control rods 32 can be changed by rotating the rotating sleeve 36. When the two control rods 32 are close to each other, the flow resistance increases, and when the distance between the two increases, the flow resistance decreases. Therefore, it is only necessary to adjust the rotation angle of the rotating sleeve 36 to adjust the flow resistance, and the current flow resistance can be displayed according to the indicator line 39 and the scale line 310, thereby facilitating the adjustment process.

[0028] In all the schemes mentioned above, the connection between the two parts can be selected according to actual conditions by welding, bolt and nut connection, bolt or screw connection or other well-known connection methods, which will not be described here one by one. In the above, all fixed connections are preferably considered to be welding. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drug dispensing device with a convenient tube head replacement, comprising a tube body (11) and a piston rod (12) slidably connected to the tube body (11), wherein the tube body (11) is provided with an extension section (13); wherein: The invention also includes a fixing mechanism, wherein the fixing mechanism includes a fixing seat (21) and a fixing ring (22) installed on the extending section (13), a compensation ring (23) is installed on the fixing ring (22), a bidirectional sleeve (24) is connected to the compensation ring (23), two bidirectional sleeves (24) are provided, and a rubber sleeve (25) is installed between the two bidirectional sleeves (24), a plurality of inclined grooves (26) are symmetrically opened in the fixing seat (21), and a same-direction block (26) is slidably connected in each inclined groove (26). 27), each of the same-direction blocks (27) is respectively installed with an elastic rod (28), and the plurality of elastic rods (28) are respectively fixedly connected to the outer walls of the two bidirectional sleeves (24), and a sealing head (29) is fitted in the protruding section (13), and the rubber sleeve (25) is pressed on the sealing head (29); and an adjustment mechanism is also included, the adjustment mechanism including two bidirectional holes (31) opened on the protruding section (13), and a control rod (32) is respectively slidably connected in each of the bidirectional holes (31).

2. A drug dispensing device with a convenient tube head replacement according to claim 1, characterized in that: The fixing mechanism further comprises an adjusting sleeve (210) connected to the fixing seat (21) in a limited rotation manner, a plurality of the same-direction blocks (27) are symmetrically provided with follower grooves (211), and double-cone bars (212) are symmetrically provided in the adjusting sleeve (210), and the double-cone bars (212) are engaged in the follower grooves (211).

3. The drug dispensing device with convenient tube head replacement according to claim 2, characterized in that: A plurality of pressurizing grooves (213) are symmetrically provided in the fixing seat (21), and a pressurizing rod (214) is respectively installed on each of the unidirectional blocks (27). The pressurizing rod (214) is sealingly and slidably connected in the pressurizing groove (213).

4. The drug dispensing device with convenient tube head replacement according to claim 3, characterized in that: The fixing seat (21) is provided with a plurality of vertical grooves (215), and every two symmetrically arranged pressurizing grooves (213) are connected in the vertical grooves (215). A push rod (216) is slidably connected in the vertical grooves (215), and a return spring (217) is installed on the push rod (216). The return spring (217) is connected in the pressurizing grooves (213).

5. The drug dispensing device with convenient tube head replacement according to claim 4, characterized in that: The plurality of push rods (216) respectively abut against the outer wall of the rubber sleeve (25), the two bidirectional sleeves (24) respectively fit on the sealing head (29), and the bidirectional sleeves (24) are provided with a flared opening (218).

6. The drug dispensing device with convenient tube head replacement according to claim 1, characterized in that: The adjustment mechanism comprises a spring (33) installed between the two control rods (32), and each control rod (32) is provided with a round head (34) at a position away from the spring (33).

7. The drug dispensing device with convenient tube head replacement according to claim 6, characterized in that: Two side plates (35) are installed on the extended section (13), a rotating sleeve (36) is fitted between the two side plates (35), and a sealing ring (37) is installed on each side plate (35), and the sealing ring (37) is inserted into the side wall of the rotating sleeve (36).

8. The drug dispensing device with convenient tube head replacement according to claim 7, characterized in that: Two pitch-changing grooves (38) are symmetrically formed on the inner wall of the rotating sleeve (36), and the two round heads (34) respectively abut against the two pitch-changing grooves (38).

9. The drug dispensing device with convenient tube head replacement according to claim 8, characterized in that: A plurality of indicator lines (39) are provided at equal intervals on the outer wall of the rotating sleeve (36), and a scale line (310) is provided on the side plate (35).

10. The drug dispensing device with convenient tube head replacement according to claim 1, characterized in that: Two handles (311) are installed on the side walls of the tube body (11).

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