An installation orientation device for a screw shaft support of an injection pen

Abstract

The utility model provides a kind of installation orientation device of screw rod support of injection pen, including shell, the front end of shell is near body end, the rear end of shell is far body end, screw rod injection mechanism includes screw rod with thread and screw rod support, screw rod support one end is sleeved screw rod and thread cooperation connection, the outer periphery of screw rod support is equipped with at least first orientation block, shell is equipped with corresponding first orientation slot, when the outer periphery of screw rod support cooperates with the inner wall of shell, first orientation block is just placed in first orientation slot, so that screw rod can be moved to near body end under the action of thread when rotating, and screw rod support cannot rotate therefore, ensure injection accuracy.

Description

Technical Field

[0001] This utility model relates to the technical field of adjustable dosage injection devices, and more specifically, to an installation and orientation device for a screw support of an injection pen. Background Technology

[0002] The adjustable dosing injection device comprises a dosing adjustment and injection mechanism and a cartridge retaining mechanism. When adjusting the dosing, the user rotates a dosing adjustment element on the dosing pouring mechanism; the force applied by the user is stored in a torsion spring for subsequent dispensing. To dispensing the adjusted dose, the user presses a dispensing button on the proximal end of the syringe; the torsional force accumulated in the torsion spring is then delivered to the drive element to propel the liquid out of the injection device.

[0003] Chinese invention patent CN118490935A discloses an installation and orientation device for a screw support of an injection pen, comprising a housing, the front end of which is a proximal end and the rear end of which is a distal end. The distal end of the housing is provided with a fixed end cap, which is sleeved with a screw support 141. One end of the screw support 141 passes through the fixed end cap and is connected to a dose setting element. A dose display bracket is sleeved on the outer periphery of the screw support 141, and the dose display bracket engages with the fixed end cap through a ratchet with a beveled end, so that the screw support 141 can only move back and forth along the axial direction relative to the dose setting element and the dose display bracket. The dose setting element is connected to the distal end of the housing, so that the dose setting element can only rotate relative to the housing. A torsion spring is provided between the screw support 141 and the dose display bracket, one end of which is connected to the proximal end of the dose display bracket near the housing, and the other end is connected to the fixed end cap.

[0004] However, the existing patented screw support 141 and the housing are only interference fit, which may result in the screw support 141 rotating with the screw 142 during the injection process, affecting the injection accuracy. Therefore, how to prevent the screw support 141 from rotating with the screw 142 is a problem that needs to be solved. Utility Model Content

[0005] In view of this, the present invention proposes an installation and orientation device for the screw support of an injection pen, including a housing 10, the front end of the housing 10 being the proximal end and the rear end of the housing 10 being the distal end. The screw injection mechanism 14 includes a threaded screw 142 and a screw support 141. One end of the screw support 141 is sleeved with the screw 142 and threadedly connected. The outer periphery of the screw support 141 is provided with at least a first orientation block 147. The housing 10 is provided with a corresponding first orientation groove 11. When the outer periphery of the screw support 141 mates with the inner wall of the housing 10, the first orientation block 147 is placed exactly in the first orientation groove 11, so that when the screw 142 rotates, it can move towards the proximal end under the action of the thread while the screw support 141 does not rotate, thus ensuring injection accuracy.

[0006] An installation and orientation device for a screw holder of an injection pen includes a housing 10, the front end of which is a proximal end and the rear end of which is a distal end. The proximal end of the housing 10 is provided with a screw injection mechanism 14, which includes a threaded screw 142 and a screw holder 141. One end of the screw holder 141 is sleeved on the screw 142 and threadedly connected. The outer periphery of the screw holder 141 is provided with at least a first orientation block 147, and the housing 10 is provided with a corresponding first orientation groove 11. When the outer periphery of the screw holder 141 mates with the inner wall of the housing 10, the first orientation block 147 is placed exactly in the first orientation groove 11, so that when the screw 142 rotates, it can move towards the proximal end under the action of the thread without the screw holder 141 rotating.

[0007] Furthermore, the inner ring 148 of the screw support 141 is a hollow structure, and the inner wall of the inner ring 148 is provided with internal threads. The inner ring 148 is threadedly connected to the screw 142.

[0008] Furthermore, the outer periphery of the screw bracket 141 is provided with a first limiting boss 1471, which is interference-fitted with the housing 10.

[0009] Furthermore, at least one first directional block 147 extends outward from the outer periphery of the first limiting boss 1471.

[0010] Preferably, a first directional block 147 is symmetrically provided on the outer periphery of the first limiting boss 1471, so that the screw bracket 141 is more firmly fixed to the housing 10.

[0011] In some embodiments, the screw bracket 141 is provided with at least one buckle 149 at the end away from the screw 142, and the corresponding position of the cartridge bottle bracket 100 is provided with at least one slot 101. When the screw bracket 141 is sleeved with the cartridge bottle bracket 100, the buckle 149 and the slot 101 are engaged in a one-to-one correspondence.

[0012] Furthermore, the screw support 141 has a flared structure with its opening facing the cartridge bottle holder 100, and the plurality of buckles 149 are integrally formed with the inner wall of the opening of the screw support 141.

[0013] Furthermore, since the buckle 149 is located on the inner wall of the screw bracket 141, and the screw bracket 141 is located inside the housing 10, it is somewhat difficult to snap the bottle holder 100 into place. The bottle holder 100 has a second limiting protrusion 102 around its outer periphery, and the inner wall of the housing 10 has a second limiting strip 13 at the corresponding position. When the bottle holder 100 is sleeved with the screw bracket 141, the second limiting protrusion 102 matches and connects with the second limiting strip 13.

[0014] Furthermore, at least one second directional block 103 extends outward from the outer periphery of the second limiting boss 102, and the housing 10 is provided with a corresponding second directional groove 12. When the second directional block 103 is placed in the second directional groove 12, the buckle 149 of the screw bracket 141 is exactly engaged with the slot 101 of the cartridge bottle bracket 100, which can effectively reduce the difficulty of installation and avoid installation errors.

[0015] The distal end of the housing 10 is provided with a fixed end cap 20. A screw sleeve 30 is fitted inside the housing 10. The screw sleeve 30 passes sequentially through the fixed end cap 20, the adjusting knob 50, and the injection button 80. The adjusting knob 50 is connected to the distal end of the housing 10 and can only rotate relative to the housing 10. From the inside to the outside, a torsion spring 70, a dose scale bracket 60, and a dose display element 90 are sequentially fitted around the outer periphery of the screw sleeve 30. The dose display element 90 is spirally connected to the housing 10. One end of the torsion spring 70 is connected to the proximal end of the dose scale bracket 60 near the housing 10, and the other end is connected to the fixed end cap 20. When injection... During injection, the screw sleeve 30 disengages from the injection button 80. The screw sleeve 30 moves towards the proximal end until it engages with the screw injection mechanism 14 for injection. The torsion spring 70 releases energy, and the screw sleeve 30, the dosage scale support 60, the dosage display element 90, and the adjustment knob 50 rotate in opposite directions. The dosage display element 90 moves towards the distal end along the thread of the housing 10. When adjusting the dosage, the forward selection adjustment knob 50 drives the screw sleeve 30, the dosage scale support 60, and the dosage display element 90 to rotate synchronously, and stores energy in the torsion spring 70. The dosage display element 90 moves towards the proximal end along the thread of the housing 10.

[0016] In some embodiments, the screw injection mechanism 14 further includes an anti-reverse mechanism 143. The anti-reverse mechanism 143 is sleeved with the screw 142 and located near the distal end of the screw support 141. The anti-reverse mechanism 143 has a waist-shaped through hole 144 at its center. The cross-section of the body of the screw 142 is waist-shaped, so that the rotation of the anti-reverse mechanism 143 can drive the screw 142 to rotate. When injection begins, the lower part of the anti-reverse mechanism 143 engages with the screw sleeve 30. The screw sleeve 30 drives the anti-reverse mechanism 143 to rotate, thereby driving the screw 142 to rotate.

[0017] Furthermore, the anti-reverse mechanism 143 is provided with a spring arm 145 around its outer periphery, and the free end of the spring arm 145 is provided with a protruding pawl 146. The inner wall of the housing 10 is provided with evenly spaced pawls corresponding to the position of the anti-reverse mechanism 143. The anti-reverse mechanism 143 can only drive the pawl 146 to rotate in the forward direction, but cannot rotate in the reverse direction.

[0018] The beneficial effects of this utility model are as follows: This utility model proposes an installation and orientation device for the screw support of an injection pen, including a housing 10. The front end of the housing 10 is the proximal end, and the rear end of the housing 10 is the distal end. The screw injection mechanism 14 includes a threaded screw 142 and a screw support 141. One end of the screw support 141 is sleeved with the screw 142 and threadedly connected. The outer periphery of the screw support 141 is provided with at least a first orientation block 147. The housing 10 is provided with a corresponding first orientation groove 11. When the outer periphery of the screw support 141 is engaged with the inner wall of the housing 10, the first orientation block 147 is placed exactly in the first orientation groove 11, so that when the screw 142 rotates, it can move towards the proximal end under the action of the thread, while the screw support 141 will not rotate as a result, thus ensuring injection accuracy. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the injection pen of this utility model.

[0020] Figure 2 This is an exploded view of the overall mounting and orientation device for the screw bracket of the injection pen of this utility model.

[0021] Figure 3 This is a cross-sectional connection diagram of the mounting and orientation device for the screw bracket of the injection pen of this utility model.

[0022] Figure 4 This is a structural diagram of the housing of the mounting and orientation device for the screw bracket of the injection pen of this utility model.

[0023] Figure 5 This is a structural diagram of the screw bracket of the screw bracket mounting and orientation device for the injection pen of this utility model.

[0024] Figure 6 This is a structural diagram of the cartridge holder of the screw bracket mounting and orientation device for the injection pen of this utility model.

[0025] Figure 7 This is a structural diagram showing the connection between the screw and the screw support of the mounting and orienting device for the screw support of the injection pen of this utility model.

[0026] Figure 8 This diagram shows the connection structure of the screw and anti-reverse mechanism of the screw bracket mounting and orientation device for the injection pen of this utility model.

[0027] Explanation of main component symbols

[0028] Housing 10; First directional groove 11; Second directional groove 12; Second limiting strip 13; Screw injection mechanism 14; Screw support 141; Screw 142; Anti-reverse mechanism 143; Waist-shaped through hole 144; Spring arm 145; Pawl 146; First directional block 147; First limiting boss 1471; Inner ring 148; Buckle 149; Fixed end cap 20; Screw sleeve 30; Pawl; Adjustment knob 50; Dosage scale support 60; Torsion spring 70; Injection button 80; Dosage display element 90; Cartridge holder 100; Cartridge slot 101; Second limiting boss 102; Second directional block 103.

[0029] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation Example 1

[0030] like Figure 1-5 As shown,

[0031] An installation and orientation device for a screw holder of an injection pen includes a housing 10, the front end of which is a proximal end and the rear end of which is a distal end. The proximal end of the housing 10 is provided with a screw injection mechanism 14, which includes a threaded screw 142 and a screw holder 141. One end of the screw holder 141 is sleeved on the screw 142 and threadedly connected. The outer periphery of the screw holder 141 is provided with at least a first orientation block 147, and the housing 10 is provided with a corresponding first orientation groove 11. When the outer periphery of the screw holder 141 mates with the inner wall of the housing 10, the first orientation block 147 is placed exactly in the first orientation groove 11, so that when the screw 142 rotates, it can move towards the proximal end under the action of the thread without the screw holder 141 rotating.

[0032] The inner ring 148 of the screw support 141 is a hollow structure, and the inner wall of the inner ring 148 is provided with internal threads. The inner ring 148 is threadedly connected to the screw 142. The outer periphery of the screw support 141 is provided with a first limiting boss 1471. The first limiting boss 1471 is interference-fitted with the housing 10. A first directional block 147 is symmetrically provided extending outward from the outer periphery of the first limiting boss 1471, so that the screw support 141 and the housing 10 are more firmly fixed.

[0033] The distal end of the housing 10 is provided with a fixed end cap 20. A screw sleeve 30 is fitted inside the housing 10. The screw sleeve 30 passes sequentially through the fixed end cap 20, the adjusting knob 50, and the injection button 80. The adjusting knob 50 is connected to the distal end of the housing 10 and can only rotate relative to the housing 10. From the inside to the outside, a torsion spring 70, a dose scale bracket 60, and a dose display element 90 are sequentially fitted around the outer periphery of the screw sleeve 30. The dose display element 90 is spirally connected to the housing 10. One end of the torsion spring 70 is connected to the proximal end of the dose scale bracket 60 near the housing 10, and the other end is connected to the fixed end cap 20. When injection... During injection, the screw sleeve 30 disengages from the injection button 80. The screw sleeve 30 moves towards the proximal end until it engages with the screw injection mechanism 14 for injection. The torsion spring 70 releases energy, and the screw sleeve 30, the dosage scale support 60, the dosage display element 90, and the adjustment knob 50 rotate in opposite directions. The dosage display element 90 moves towards the distal end along the thread of the housing 10. When adjusting the dosage, the forward selection adjustment knob 50 drives the screw sleeve 30, the dosage scale support 60, and the dosage display element 90 to rotate synchronously, and stores energy in the torsion spring 70. The dosage display element 90 moves towards the proximal end along the thread of the housing 10.

[0034] like Figure 5 and Figure 6 As shown, the screw bracket 141 has at least one buckle 149 at the end away from the screw 142, and the corresponding position of the cartridge bottle holder 100 has at least one slot 101. When the screw bracket 141 is sleeved with the cartridge bottle holder 100, the buckle 149 and the slot 101 are engaged one-to-one. The screw bracket 141 has a flared structure with its opening facing the cartridge bottle holder 100. Multiple buckles 149 are integrally formed with the inner wall of the opening of the screw bracket 141. Because the buckles 149 are located on the inner wall of the screw bracket 141, and the screw bracket 141 is located inside the housing 10, the engagement and installation of the cartridge bottle holder 100 is somewhat difficult. A second limiting boss 102 is provided around the outer periphery of the housing 10, and a second limiting strip 13 is provided at the corresponding position on the inner wall of the housing 10. When the cartridge bottle holder 100 is sleeved with the screw holder 141, the second limiting boss 102 is matched and connected with the second limiting strip 13. At least one second directional block 103 is provided extending outward from the outer periphery of the second limiting boss 102. The housing 10 is provided with a corresponding second directional groove 12. When the second directional block 103 is placed in the second directional groove 12, the buckle 149 of the screw holder 141 is sleeved with the slot 101 of the cartridge bottle holder 100, which can effectively reduce the installation difficulty and avoid installation errors.

[0035] like Figure 7 and Figure 8 As shown, the screw injection mechanism 14 also includes an anti-reverse mechanism 143. The anti-reverse mechanism 143 is sleeved with the screw 142 and located near the distal end of the screw support 141. The anti-reverse mechanism 143 has a waist-shaped through hole 144 at its center. The cross-section of the screw 142 is waist-shaped, so that the rotation of the anti-reverse mechanism 143 can drive the screw 142 to rotate. When injection begins, the lower part of the anti-reverse mechanism 143 engages with the screw sleeve 30. The screw sleeve 30 drives the anti-reverse mechanism 143 to rotate, thereby driving the screw 142 to rotate. The outer periphery of the anti-reverse mechanism 143 is provided with a spring arm 145. The free end of the spring arm 145 is provided with a protruding pawl 146. The inner wall of the housing 10 is provided with evenly spaced ratchet blocks corresponding to the position of the anti-reverse mechanism 143. The anti-reverse mechanism 143 can only drive the pawl 146 to rotate in the forward direction and cannot rotate in the reverse direction.

[0036] The beneficial effects of this utility model are as follows: This utility model proposes an installation and orientation device for the screw support of an injection pen, including a housing 10. The front end of the housing 10 is the proximal end, and the rear end of the housing 10 is the distal end. The screw injection mechanism 14 includes a threaded screw 142 and a screw support 141. One end of the screw support 141 is sleeved with the screw 142 and threadedly connected. The outer periphery of the screw support 141 is provided with at least a first orientation block 147. The housing 10 is provided with a corresponding first orientation groove 11. When the outer periphery of the screw support 141 is engaged with the inner wall of the housing 10, the first orientation block 147 is placed exactly in the first orientation groove 11, so that when the screw 142 rotates, it can move towards the proximal end under the action of the thread, while the screw support 141 will not rotate as a result, thus ensuring injection accuracy.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A mounting and orientation device for a screw support of an injection pen, comprising a housing (10), wherein the front end of the housing (10) is a proximal end and the rear end of the housing (10) is a distal end, and the proximal end of the housing (10) is provided with a screw injection mechanism (14), characterized in that: The screw injection mechanism (14) includes a threaded screw (142) and a screw support (141). One end of the screw support (141) is sleeved with the screw (142) and threadedly connected. The outer periphery of the screw support (141) is provided with at least a first directional block (147). The housing (10) is provided with a corresponding first directional groove (11). When the outer periphery of the screw support (141) is engaged with the inner wall of the housing (10), the first directional block (147) is placed in the first directional groove (11), so that when the screw (142) rotates, it can move towards the end near the body under the action of the thread, and the screw support (141) will not rotate as a result.

2. The mounting and orientation device for the screw bracket of the injection pen as described in claim 1, characterized in that: The inner ring (148) of the screw support (141) is a hollow structure, and the inner wall of the inner ring (148) is provided with internal threads. The inner ring (148) is threadedly connected to the screw (142).

3. The mounting and orientation device for the screw bracket of the injection pen as described in claim 2, characterized in that: The screw support (141) has a first limiting boss (1471) around its outer periphery, and the first limiting boss (1471) is interference-fitted with the housing (10).

4. The mounting and orientation device for the screw bracket of the injection pen as described in claim 3, characterized in that: At least one first directional block (147) extends outward from the outer periphery of the first limiting boss (1471).

5. The mounting and orientation device for the screw bracket of the injection pen as described in claim 1, characterized in that: The screw bracket (141) has at least one buckle (149) at the end away from the screw (142), and the corresponding position of the cartridge bottle bracket (100) has at least one slot (101). When the screw bracket (141) is sleeved with the cartridge bottle bracket (100), the buckle (149) and the slot (101) are engaged in a one-to-one correspondence.

6. The mounting and orientation device for the screw bracket of the injection pen as described in claim 5, characterized in that: The screw support (141) has a flared structure with its opening facing the cartridge bottle holder (100), and the plurality of the buckles (149) are integrally formed with the inner wall of the opening of the screw support (141).

7. The mounting and orientation device for the screw bracket of the injection pen as described in claim 6, characterized in that: Since the buckle (149) is placed on the inner wall of the screw bracket (141), the screw bracket (141) is placed inside the housing (10), the outer periphery of the cartridge bottle bracket (100) is provided with a second limiting boss (102), and the inner wall of the housing (10) is provided with a second limiting strip (13) at the corresponding position. When the cartridge bottle bracket (100) is sleeved with the screw bracket (141), the second limiting boss (102) is exactly matched and connected with the second limiting strip (13).

8. The mounting and orientation device for the screw bracket of the injection pen as described in claim 7, characterized in that: The outer periphery of the second limiting boss (102) extends outward with at least one second directional block (103), and the housing (10) is provided with a corresponding second directional groove (12). When the second directional block (103) is placed in the second directional groove (12), the buckle (149) of the screw bracket (141) is just engaged with the slot (101) of the cartridge bottle bracket (100), which can effectively reduce the installation difficulty and avoid installation errors.

9. The mounting and orientation device for the screw bracket of the injection pen as described in claim 1, characterized in that: The screw injection mechanism (14) also includes an anti-reverse mechanism (143). The anti-reverse mechanism (143) is sleeved with the screw (142) and located near the distal end of the screw support (141). The anti-reverse mechanism (143) has a waist-shaped through hole (144) in the center. The cross-section of the body of the screw (142) is waist-shaped, so that the rotation of the anti-reverse mechanism (143) can drive the screw (142) to rotate. When injection begins, the lower part of the anti-reverse mechanism (143) is engaged with the screw sleeve (30). The screw sleeve (30) drives the anti-reverse mechanism (143) to rotate, thereby driving the screw (142) to rotate.

10. The mounting and orientation device for the screw bracket of the injection pen as described in claim 9, characterized in that: The anti-reverse mechanism (143) is surrounded by a spring arm (145), and the free end of the spring arm (145) is provided with a protruding pawl (146). The inner wall of the housing (10) is provided with evenly spaced pawls corresponding to the position of the anti-reverse mechanism (143). The anti-reverse mechanism (143) can only drive the pawl (146) to rotate in the forward direction, but cannot rotate in the reverse direction.

Images