Damping cylinder and injector

Abstract

The damping cylinder comprises a front cylinder body, a rear cylinder body and a plurality of connecting pieces which are sequentially arranged from front to back, the connecting pieces are arranged around the axis of the front cylinder body at intervals, each connecting piece comprises a connecting part, a rear transition part and a friction part, and the two ends of each connecting part are connected to the front cylinder body and the rear cylinder body respectively; the friction part and the rear transition part are arranged on the side face of the connecting part, the thickness of the rear transition part in the radial direction of the front cylinder is gradually increased from back to front, the friction part is arranged at the front end of the rear transition part, and the side face of the friction part is connected with the side face of the rear transition part; the friction force between the friction part and the cavity wall of the second containing cavity of the rotary sleeve provides a damping effect for rotation and front-back movement of the rotary sleeve, and compared with a scheme using damping oil, the effects that the damping effect is slightly influenced by environmental factors, and the accuracy of dose adjustment and injection operation is high are achieved; and moreover, the production process is simpler, the production cost is lower, and the reliability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a damping cylinder and a syringe. Background Art

[0002] At present, when adjusting the dose upward or downward, the dose adjustment component usually needs to be screwed, and there is also an operation of pulling the dose adjustment component axially. During these operations, a certain screwing force and pulling force are required so that the user can feel the changes in the dose and injection speed by hand, thereby making the dose adjustment and injection operations more accurate, which has the effect of improving the patient's sense of use, safety and reliability. Among them, the syringe achieves this function by coating a layer of damping oil between the flat outer surfaces of the components to increase the resistance between the components. However, the damping effect of the damping oil is easily affected by external factors such as temperature, so that the patient feels different damping effects in different environments, which can easily cause the patient to misjudge the use of the syringe, thereby reducing the accuracy of the dose adjustment and injection operations. Utility Model Content

[0003] The utility model aims to provide a damping cylinder and a syringe to solve the technical problem that the damping oil in the syringe provides a damping effect and the damping effect is different in different environments, which may easily cause the patient to misjudge the use of the syringe, thereby reducing the accuracy of the dosage adjustment and injection operation.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a damping cylinder, comprising a front cylinder, a rear cylinder and a plurality of connecting parts which are arranged in sequence from front to rear, the axis of the front cylinder and the axis of the rear cylinder are collinear, and each of the connecting parts is arranged at intervals around the axis of the front cylinder, the connecting part comprises a connecting portion, a rear transition portion and a friction portion, the two ends of the connecting portion are respectively connected to the front cylinder and the rear cylinder, the friction portion and the rear transition portion are both arranged on the side of the connecting portion away from the axis of the front cylinder, the thickness of the rear transition portion along the radial direction of the front cylinder gradually increases from back to front, the friction portion is arranged at the front end of the rear transition portion, and the side of the friction portion away from the axis of the front cylinder and the side of the rear transition portion away from the axis of the front cylinder are connected.

[0005] Optionally, the connecting member further includes a front transition portion, the thickness of the front transition portion along the radial direction of the front tube gradually decreases from back to front, and the front transition portion is arranged at the front end of the friction portion.

[0006] Optionally, a deformation groove extending forward is provided at the rear end of the rear tube, and the deformation groove penetrates to the tube hole of the rear tube.

[0007] Optionally, an outer side wall at the rear end of the rear tube is provided with a terminal transition portion, and a diameter of the terminal transition portion gradually increases from the back to the front.

[0008] The utility model also relates to a syringe, comprising a rotating sleeve, a fixed sleeve, a push rod, a retaining ring and the damping cylinder, wherein a first accommodating chamber is arranged in the fixed sleeve, the rotating sleeve, the damping cylinder, the retaining ring and the push rod are arranged in the first accommodating chamber in sequence from back to front, the outer side wall of the retaining ring is connected to the cavity wall of the first accommodating chamber, the rear end face of the retaining ring is provided with a first limiting block, the front end of the front cylinder is provided with a second limiting block, the first limiting block and the second limiting block abut against each other to prevent the damping cylinder and the fixed sleeve from rotating relative to each other around the axis of the damping cylinder, the push rod is connected to the first accommodating chamber so that the push rod can move in the front and rear directions, the retaining ring is provided with a through hole, and the push rod passes through the through hole The rear cylinder has a plurality of holes, the push rod is inserted into the cylinder hole of the front cylinder, the outer wall of the push rod is threadedly connected to the inner wall of the front cylinder, the rotating sleeve is connected to the first accommodating chamber, so that the rotating sleeve can move in the front and rear directions and can rotate around its axis, a second accommodating chamber is provided in the rotating sleeve, the connecting member and the rear cylinder are located in the second accommodating chamber, the friction part abuts against the cavity wall of the second accommodating chamber, the cavity wall of the second accommodating chamber is provided with a third limit block, the outer wall of the rear cylinder is provided with a fourth limit block, the front end of the fourth limit block is provided with a limit groove extending backwards, the third limit block and the side groove wall of the limit groove abut against each other to prevent the damping cylinder and the rotating sleeve from rotating relative to each other around the axis of the damping cylinder.

[0009] Optionally, a cavity wall of the second accommodating cavity is provided with a plurality of the third limiting blocks, and the plurality of the third limiting blocks are arranged around the axis of the rotating sleeve.

[0010] Optionally, the second accommodating cavity includes a first inner cavity and a second inner cavity arranged in sequence from front to back, the diameter of the first inner cavity is smaller than the diameter of the second inner cavity, and the third limiting block is arranged on the cavity wall of the second inner cavity.

[0011] Optionally, an outer wall of the front end of the front tube is provided with an abutment disk, and the second limiting block is provided on the front end surface of the abutment disk.

[0012] Optionally, the front end surface of the abutment plate is provided with an abutment portion, and the distance between the front end surface of the abutment portion and the front end surface of the abutment plate is greater than the distance between the front end surface of the second limiting block and the front end surface of the abutment plate.

[0013] Optionally, the abutment plate includes an elastic arm and a connecting block, two ends of the connecting block are respectively connected to the outer side wall of the front tube and the side wall of the elastic arm, the elastic arm is arranged to separate the outer side wall of the front tube, and the second limit block is arranged at one end of the elastic arm away from the connecting block.

[0014] Compared with the prior art, the damping cylinder and the syringe in the embodiment of the utility model have the following beneficial effects:

[0015] The utility model arranges a plurality of connecting parts around the axis of the front cylinder between the front cylinder and the rear cylinder of the damping cylinder for connection, and a rear transition part and a friction part of the connecting part are arranged in sequence from rear to front on the side of the connecting part away from the axis of the front cylinder, wherein, since the thickness of the rear transition part gradually increases from rear to front, the side of the friction part away from the axis of the front cylinder and the side of the rear transition part away from the axis of the front cylinder are connected, therefore, the rotating sleeve of the syringe can be sleeved on the outer side of the damping cylinder from rear to front along the rear transition part, and the connecting part is pressed inwardly to elastic deformation during the forward movement, and finally the side of the friction part away from the axis of the front cylinder can be pressed against the cavity wall of the second accommodating cavity, and the friction force between the friction part and the cavity wall of the second accommodating cavity provides a damping effect for the rotation and forward and backward movement of the rotating sleeve, compared with the scheme of using damping oil, the damping effect is less affected by environmental factors, the dosage adjustment and injection operation have high accuracy, and the production process is simpler, the production cost is lower, and the reliability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the damping cylinder of the utility model is shown in FIG. Figure 1 .

[0017] Figure 2 The structure of the damping cylinder of the utility model is shown in FIG. Figure 2 .

[0018] Figure 3 It is the front view of the syringe of the utility model.

[0019] Figure 4 It is a cross-sectional view of the syringe of the utility model.

[0020] Figure 5 This is a cross-sectional view of the syringe of the utility model ignoring the damping cylinder and the push rod.

[0021] Figure numerals: 1. damping cylinder; 11. front cylinder; 111. second limit block; 112. abutment plate; 1121. elastic arm; 1122. connecting block; 113. abutment portion; 12. connecting piece; 121. connecting portion; 122. front transition portion; 123. friction portion; 124. rear transition portion; 13. rear cylinder; 131. deformation groove; 132. terminal transition portion; 133. fourth limit block; 134. limit groove; 2. rotating sleeve; 21. second accommodating chamber; 211. first inner chamber; 212. second inner chamber; 22. third limit block; 3. fixed sleeve; 31. first accommodating chamber; 4. push rod; 5. retaining ring; 51. first limit block; 52. through hole. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] like Figures 1 to 5As shown, a damping cylinder of the utility model comprises a front cylinder 11, a rear cylinder 13 and a plurality of connecting members 12 which are arranged in sequence from front to rear, the axis of the front cylinder 11 and the axis of the rear cylinder 13 being collinear, and each of the connecting members 12 being arranged at intervals around the axis of the front cylinder 11, and the connecting member 12 comprising a connecting portion 121, a rear transition portion 124 and a friction portion 123, the two ends of the connecting portion 121 being respectively connected to the front cylinder 11 and the rear cylinder 13, the friction portion 123 and the rear transition portion 124 being both arranged on the side of the connecting portion 121 away from the axis of the front cylinder 11, the thickness of the rear transition portion 124 along the radial direction of the front cylinder 11 gradually increases from rear to front, the friction portion 123 being arranged at the front end of the rear transition portion 124, the side of the friction portion 123 away from the axis of the front cylinder 11 and the side of the rear transition portion 124 away from the axis of the front cylinder 11 being connected.

[0026] In the above technical solution, since the thickness of the rear transition portion 124 gradually increases from the back to the front, the side of the friction portion 123 away from the axis of the front cylinder 11 and the side of the rear transition portion 124 away from the axis of the front cylinder 11 are connected, and the connecting portions 121 are arranged at intervals. Therefore, the rotating sleeve 2 of the syringe can be sleeved on the outside of the damping cylinder 1 from the back to the front along the rear transition portion 124, and the connecting member 12 is pressed inward to elastic deformation during the forward movement, and finally the side of the friction portion 123 away from the axis of the front cylinder 11 can be against the cavity wall of the second accommodating cavity 21, and the friction force between the friction portion 123 and the cavity wall of the second accommodating cavity 21 provides a damping effect on the rotation and forward and backward movement of the rotating sleeve 2.

[0027] Furthermore, the connecting member 12 also includes a front transition portion 122, the thickness of which gradually decreases from back to front along the radial direction of the front tube 11. The front transition portion 122 is arranged at the front end of the friction portion 123 to make the structure on the connecting member 12 symmetrical and facilitate processing.

[0028] Furthermore, a deformation groove 131 extending forward is provided at the rear end of the rear cylinder 13, and the deformation groove 131 penetrates into the cylinder hole of the rear cylinder 13, so that the rear cylinder 13 can be elastically deformed inwardly to a greater extent, so as to facilitate the rotating sleeve 2 to be sleeved on the outer side of the rear cylinder 13 from back to front.

[0029] Furthermore, an outer side wall at the rear end of the rear tube 13 is provided with an end transition portion 132, and the diameter of the end transition portion 132 gradually increases from the back to the front, so that the second accommodating cavity 21 of the rotating sleeve 2 can be sleeved forward along the end transition portion 132, so as to facilitate the rotating sleeve 2 to be sleeved on the outer side of the rear tube 13 from the back to the front.

[0030] Furthermore, the damping cylinder may be an integral structure and may be manufactured by an integral injection molding process.

[0031] The utility model also relates to a syringe, comprising a rotating sleeve 2, a fixed sleeve 3, a push rod 4, a retaining ring 5 and the aforementioned damping cylinder 1, wherein a first accommodating chamber 31 is provided in the fixed sleeve 3, the rotating sleeve 2, the damping cylinder 1, the retaining ring 5 and the push rod 4 are sequentially arranged in the first accommodating chamber 31 from back to front, the outer side wall of the retaining ring 5 is connected to the cavity wall of the first accommodating chamber 31, the rear end surface of the retaining ring 5 is provided with a first limiting block 51, the front end of the front cylinder 11 is provided with a second limiting block 111, the first limiting block 51 and the second limiting block 111 abut against each other to prevent the damping cylinder 1 and the fixed sleeve 3 from rotating relative to each other around the axis of the damping cylinder 1, the push rod 4 is connected to the first accommodating chamber 31 so that the push rod 4 can move in the front and rear directions, the retaining ring 5 is provided with a through hole 52, the push rod 4 passes through the through hole 52 The push rod 4 is inserted into the barrel hole of the front barrel 11, and the outer wall of the push rod 4 is threadedly connected to the inner wall of the front barrel 11. The rotating sleeve 2 is connected to the first accommodating chamber 31, so that the rotating sleeve 2 can move in the front and rear directions and can rotate around its axis. A second accommodating chamber 21 is provided in the rotating sleeve 2, and the connecting member 12 and the rear barrel 13 are located in the second accommodating chamber 21. The friction portion 123 abuts against the cavity wall of the second accommodating chamber 21, and the cavity wall of the second accommodating chamber 21 is provided with a third limit block 22. The outer wall of the rear barrel 13 is provided with a fourth limit block 133, and the front end of the fourth limit block 133 is provided with a limit groove 134 extending backward. The third limit block 22 and the side groove wall of the limit groove 134 abut against each other to prevent the damping barrel 1 and the rotating sleeve 2 from rotating relative to each other around the axis of the damping barrel 1.

[0032] In the above technical solution, the front end of the front cylinder 11 is attached to the rear end of the retaining ring 5, the first limit block 51 and the second limit block 111 are against each other, the damping cylinder 1 and the fixed sleeve 3 cannot rotate relative to each other, and the friction portion 123 is against the cavity wall of the second accommodating cavity 21. When the rotating sleeve 2 moves forward and backward and rotates around its axis, the friction portion 123 and the cavity wall of the second accommodating cavity 21 rub against each other to provide friction force; when the rotating sleeve 2 moves backward, the third limit block 22 is inserted into the limit groove 134, and the third limit block 22 and the side groove of the limit groove 134 The walls abut against each other, and the rotating sleeve 2 and the damping cylinder 1 cannot rotate relative to each other. Furthermore, the rotating sleeve 2 continues to move backward, and the rear end of the third limit block 22 abuts against the groove wall of the limit groove 134 perpendicular to the front and rear directions. The rotating sleeve 2 pushes the damping cylinder 1 backward, and the first limit block 51 and the second limit block 111 are disengaged, and the damping cylinder 1 and the fixed sleeve 3 can rotate relative to each other. Furthermore, due to the threaded connection between the front cylinder 11 and the push rod 4, the rotating sleeve 2 rotates, thereby driving the damping cylinder 1 to rotate, so that the push rod 4 moves along the front and rear directions.

[0033] Furthermore, the cavity wall of the second accommodating cavity 21 is provided with a plurality of the third limit blocks 22, and the plurality of the third limit blocks 22 are arranged around the axis of the rotating sleeve 2, so that after the rotating sleeve 2 is rotated to various angles, any third limit block 22 can be aligned with and inserted into the limit groove 134.

[0034] Furthermore, the second accommodating chamber 21 includes a first inner cavity 211 and a second inner cavity 212 arranged in sequence from front to back, the diameter of the first inner cavity 211 is smaller than the diameter of the second inner cavity 212, and the third limit block 22 is arranged on the cavity wall of the second inner cavity 212, so that the structure of the rotating sleeve 2 is more compact.

[0035] Furthermore, an outer wall ring of the front end of the front cylinder 11 is provided with an abutment plate 112, and the second limit block 111 is arranged on the front end surface of the abutment plate 112. Further, the front end surface of the abutment plate 112 is provided with an abutment portion 113, and the distance between the front end surface of the abutment portion 113 and the front end surface of the abutment plate 112 is greater than the distance between the front end surface of the second limit block 111 and the front end surface of the abutment plate 112, so that the abutment portion 113 is only used to abut against the rear end surface of the retaining ring 5, and the second limit block 111 is only used to abut against the first limit block 51 to prevent the front end of the second limit block 111 from being worn.

[0036] Furthermore, the abutment plate 112 includes an elastic arm 1121 and a connecting block 1122, and the two ends of the connecting block 1122 are respectively connected to the outer wall of the front tube 11 and the side wall of the elastic arm 1121, and the elastic arm 1121 is arranged to be separated from the outer wall of the front tube 11, and the second limit block 111 is arranged at one end of the elastic arm 1121 away from the connecting block 1122, so that when the second limit block 111 and the first limit block 51 abut against each other, the elastic arm 1121 can undergo elastic deformation to a certain extent.

[0037] In summary, the embodiment of the utility model provides a damping cylinder and a syringe, and the technical effects thereof are:

[0038] In the present invention, a plurality of connecting members 12 are arranged around the axis of the front cylinder 11 between the front cylinder 1 and the rear cylinder 13 of the damping cylinder 1. The side of the connecting portion 121 of the connecting member 12 away from the axis of the front cylinder 11 is provided with a rear transition portion 124 and a friction portion 123 of the connecting member 12 in sequence from back to front. Since the thickness of the rear transition portion 124 gradually increases from back to front, the side of the friction portion 123 away from the axis of the front cylinder 11 is connected to the side of the rear transition portion 124 away from the axis of the front cylinder 11. Therefore, the rotating sleeve 2 of the syringe can be rotated along the rear transition portion 124. It is sleeved on the outside of the damping cylinder 1 from back to front, and the connecting piece 12 is pressed inward to elastic deformation during the forward movement, so that the side of the friction portion 123 away from the axis of the front cylinder 11 can be against the wall of the second accommodating chamber 21. The friction force between the friction portion 123 and the wall of the second accommodating chamber 21 provides a damping effect for the rotation and forward and backward movement of the rotating sleeve 2. Compared with the solution of using damping oil, the damping effect is less affected by environmental factors, the dosage adjustment and injection operation are more accurate, and the production process is simpler, the production cost is lower, and the reliability is higher.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A damping cylinder, characterized in that: The invention comprises a front cylinder (11), a rear cylinder (13) and a plurality of connecting members (12) which are arranged in sequence from front to rear, wherein the axis of the front cylinder (11) and the axis of the rear cylinder (13) are collinear, and each of the connecting members (12) is arranged at intervals around the axis of the front cylinder (11), and the connecting member (12) comprises a connecting portion (121), a rear transition portion (124) and a friction portion (123), wherein two ends of the connecting portion (121) are respectively connected to the front cylinder (11) and the rear cylinder (13), and the friction portion (123) is The rubbing portion (123) and the rear transition portion (124) are both arranged on the side of the connecting portion (121) away from the axis of the front tube (11), and the thickness of the rear transition portion (124) along the radial direction of the front tube (11) gradually increases from back to front. The friction portion (123) is arranged at the front end of the rear transition portion (124), and the side of the friction portion (123) away from the axis of the front tube (11) and the side of the rear transition portion (124) away from the axis of the front tube (11) are connected.

2. The damping cylinder according to claim 1, characterized in that: The connecting member (12) further comprises a front transition portion (122), the thickness of the front transition portion (122) gradually decreases from the back to the front along the radial direction of the front tube (11), and the front transition portion (122) is arranged at the front end of the friction portion (123).

3. The damping cylinder according to claim 1, characterized in that: The rear end of the rear cylinder (13) is provided with a deformation groove (131) extending forward, and the deformation groove (131) penetrates to the cylinder hole of the rear cylinder (13).

4. The damping cylinder according to claim 1, characterized in that: The outer side wall of the rear end of the rear tube (13) is provided with a terminal transition portion (132), and the diameter of the terminal transition portion (132) gradually increases from the back to the front.

5. A syringe, characterized in that: The invention comprises a rotating sleeve (2), a fixed sleeve (3), a push rod (4), a retaining ring (5) and a damping cylinder (1) according to any one of claims 1 to 4, wherein the fixed sleeve (3) is provided with a first accommodating chamber (31), the rotating sleeve (2), the damping cylinder (1), the retaining ring (5) and the push rod (4) are arranged in the first accommodating chamber (31) from back to front, the outer side wall of the retaining ring (5) is connected to the cavity wall of the first accommodating chamber (31), and the rear end face of the retaining ring (5) is provided with A first limit block (51), a second limit block (111) is provided at the front end of the front cylinder (11), the first limit block (51) and the second limit block (111) abut against each other to prevent the damping cylinder (1) and the fixed sleeve (3) from rotating relative to each other around the axis of the damping cylinder (1), the push rod (4) is connected to the first accommodating chamber (31), so that the push rod (4) can move in the front and rear directions, the retaining ring (5) is provided with a through hole (52), and the push rod (4) passes through the through hole (52), the push rod (4) is inserted into the barrel hole of the front barrel (11), the outer wall of the push rod (4) is threadedly connected to the inner wall of the front barrel (11), the rotating sleeve (2) is connected to the first accommodating chamber (31), so that the rotating sleeve (2) can move in the front-back direction and can rotate around its axis, a second accommodating chamber (21) is provided in the rotating sleeve (2), the connecting member (12) and the rear barrel (13) are located in the second accommodating chamber (21), and the friction portion ( 123) abuts against the cavity wall of the second accommodating cavity (21), the cavity wall of the second accommodating cavity (21) is provided with a third limit block (22), the outer side wall of the rear cylinder (13) is provided with a fourth limit block (133), the front end of the fourth limit block (133) is provided with a limit groove (134) extending backwards, and the third limit block (22) and the side groove wall of the limit groove (134) abut against each other to prevent the damping cylinder (1) and the rotating sleeve (2) from rotating relative to each other around the axis of the damping cylinder (1).

6. The syringe according to claim 5, characterized in that The cavity wall of the second accommodating cavity (21) is provided with a plurality of the third limiting blocks (22), and the plurality of the third limiting blocks (22) are arranged around the axis of the rotating sleeve (2).

7. The syringe according to claim 5, characterized in that The second accommodating cavity (21) comprises a first inner cavity (211) and a second inner cavity (212) which are arranged in sequence from front to back, the cavity diameter of the first inner cavity (211) is smaller than the cavity diameter of the second inner cavity (212), and the third limiting block (22) is arranged on the cavity wall of the second inner cavity (212).

8. The syringe according to claim 5, characterized in that An abutment disk (112) is provided around the outer wall of the front end of the front tube (11), and the second limit block (111) is provided on the front end surface of the abutment disk (112).

9. The syringe according to claim 8, characterized in that The front end surface of the abutment plate (112) is provided with an abutment portion (113), and the distance between the front end surface of the abutment portion (113) and the front end surface of the abutment plate (112) is greater than the distance between the front end surface of the second limiting block (111) and the front end surface of the abutment plate (112).

10. The syringe according to claim 8, characterized in that The abutment plate (112) comprises an elastic arm (1121) and a connecting block (1122), two ends of the connecting block (1122) are respectively connected to the outer side wall of the front tube (11) and the side wall of the elastic arm (1121), the elastic arm (1121) is arranged to be spaced apart from the outer side wall of the front tube (11), and the second limiting block (111) is arranged at one end of the elastic arm (1121) away from the connecting block (1122).

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