Ceramic plunger and ceramic plunger syringe

Abstract

The utility model discloses a ceramic plunger which comprises a plunger body, and a plunger connecting rod is arranged at the lower end of the plunger body. The plunger connecting rod comprises a first connector fixedly connected with the lower end of the plunger body, the first connector is provided with a small-diameter section and a large-diameter section, and the small-diameter section is located on the side, facing the plunger body, of the large-diameter section. The outer diameter of the small-diameter section is smaller than that of the large-diameter section, and a step surface is arranged between the small-diameter section and the large-diameter section; when the outer diameter of the plunger main body is larger than that of the small-diameter section, the lower end surface of the plunger main body is set as a first drainage conical surface for draining the reagent towards the step surface; and when the outer diameter of the plunger main body is smaller than that of the small-diameter section, the outer peripheral wall of the top of the small-diameter section is set as a second drainage conical surface for draining the reagent towards the step surface. The utility model further discloses a ceramic plunger injector. According to the ceramic plunger and the ceramic plunger injector, reagent crystals can be effectively prevented from being accumulated on the end face of the plunger.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, in particular to a ceramic plunger and a ceramic plunger syringe. Background Art

[0002] After long-term operation of existing syringes, the reagents will crystallize and accumulate on the bottom end face of the plunger. The reagent crystals will not only corrode the stainless steel end face, but also continue to accumulate and extend to the ceramic plunger. During the reciprocating motion of the ceramic plunger, the crystal particles on the plunger will be squeezed into the syringe cavity, causing the seal ring and the outer surface of the plunger to wear and fail, which has a huge impact on the life of the syringe product. Summary of the invention

[0003] In view of this, the purpose of the utility model is to provide a ceramic plunger and a ceramic plunger syringe, which can effectively prevent reagent crystals from accumulating on the end face of the plunger.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] The utility model firstly proposes a ceramic plunger, comprising a plunger body, wherein the lower end of the plunger body is provided with a plunger connecting rod; the plunger connecting rod comprises a first connecting head fixedly connected to the lower end of the plunger body, the first connecting head is provided with a small diameter section and a large diameter section, the small diameter section is located at a side of the large diameter section facing the plunger body; the outer diameter of the small diameter section is smaller than the outer diameter of the large diameter section, and a step surface is provided between the small diameter section and the large diameter section;

[0006] When the outer diameter of the plunger body is greater than the outer diameter of the small diameter section, the lower end surface of the plunger body is configured as a first drainage conical surface for draining the reagent toward the step surface;

[0007] When the outer diameter of the plunger body is smaller than the outer diameter of the small-diameter section, the top outer peripheral wall of the small-diameter section is configured as a second drainage conical surface for draining the reagent toward the step surface.

[0008] Furthermore, the plunger connecting rod is made of stainless steel, and the outer peripheral wall of the small diameter section and the step surface are provided with a Teflon coating.

[0009] Furthermore, a connection slot is provided on the top surface of the first connector, and a connection plug that matches the connection slot is provided on the lower end surface of the plunger body.

[0010] Furthermore, at least one circumferential filling groove is provided between the connection slot and the connection plug, and epoxy resin glue for bonding and fixing the connection slot and the connection plug is provided in the filling groove.

[0011] Furthermore, a radial overflow hole communicating with the connecting slot is provided on the outer wall of the first connecting head.

[0012] Furthermore, the plunger connecting rod also includes a second connecting head, a connecting section is provided between the second connecting head and the first connecting head, the outer diameter of the first connecting head and the outer diameter of the second connecting head are both larger than the outer diameter of the connecting section, and a connecting groove is formed between the first connecting head and the second connecting head.

[0013] The utility model also proposes a ceramic plunger syringe, comprising a mounting seat, an injection cavity body mounted on the mounting seat, at least one injection cavity being arranged in the injection cavity body, an injection hole being arranged at the upper end of the injection cavity, and a ceramic plunger being arranged in the injection cavity and slidingly cooperating with the injection cavity; a motor assembly for driving the ceramic plunger to reciprocate in the corresponding injection hole is arranged on the mounting seat; the ceramic plunger adopts the ceramic plunger as described above.

[0014] Furthermore, a cavity cover plate is provided at the lower end of the injection cavity, and a sealing ring is provided between the cavity cover plate and the injection cavity.

[0015] Furthermore, at least one sealing ring is provided between the lower end of the injection cavity and the ceramic plunger.

[0016] Further, the motor assembly includes a linear motor, a linear guide rail parallel to the output shaft of the linear motor, and a linear slider slidably matched with the linear guide rail, and the output shaft of the linear motor is fixedly connected to the linear slider;

[0017] The plunger connecting rod further includes a second connecting head, a connecting section is provided between the second connecting head and the first connecting head, the outer diameter of the first connecting head and the outer diameter of the second connecting head are both larger than the outer diameter of the connecting section, and a connecting groove is formed between the first connecting head and the second connecting head;

[0018] The linear slider is provided with a connecting block, and the connecting block and the connecting section are provided with connecting slots correspondingly; the connecting section is embedded in the connecting slot and the connecting block is located between the first connector and the second connector.

[0019] The beneficial effects of the utility model are:

[0020] The ceramic plunger of the utility model is provided with a small diameter section and a large diameter section on the first connecting head, and a step surface is provided between the small diameter section and the large diameter section; there is a gap between the step surface and the lower end surface of the plunger body, so that when the outer diameter of the plunger body is larger than the outer diameter of the small diameter section, the lower end surface of the plunger body is provided with a first drainage conical surface, and the reagent can be drained into the annular groove between the step surface and the lower end surface of the plunger body, which can effectively prevent the reagent crystals from accumulating on the lower end surface of the plunger body; when the outer diameter of the plunger body is smaller than the outer diameter of the small diameter section, a second drainage conical surface is provided on the top peripheral wall of the small diameter section, and the reagent can be drained to the step surface, which can effectively prevent the reagent crystals from accumulating on the lower end surface of the plunger body;

[0021] In summary, the ceramic plunger of the utility model can effectively prevent crystals from accumulating on the lower end surface of the plunger body, thereby preventing reagent crystals from being pushed into the injection cavity and causing damage as the ceramic plunger reciprocates; and can prevent the disorderly spread of reagent crystals, causing large-area corrosion that cannot be cleaned, so as to achieve the purpose of facilitating the cleaning of reagent crystals and increasing service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0023] Figure 1 This is a schematic diagram of the structure of Example 1 of the ceramic plunger syringe of the utility model;

[0024] Figure 2 is a full cross-sectional top view of the ceramic plunger syringe of this embodiment;

[0025] Figure 3 Schematic diagram of the structure of the ceramic plunger of this embodiment;

[0026] Figure 4 It is a schematic diagram of the assembly structure between the plunger body and the plunger connecting rod;

[0027] Figure 5 This is a schematic diagram of the structure of Example 2 of the ceramic plunger syringe of the utility model;

[0028] Figure 6 is a full cross-sectional top view of the ceramic plunger syringe of this embodiment;

[0029] Figure 7 Schematic diagram of the structure of the ceramic plunger of this embodiment;

[0030] Figure 8 It is a schematic diagram of the assembly structure between the plunger body and the plunger connecting rod;

[0031] Fig. 9 This is a schematic structural diagram of Example 3 of the ceramic plunger syringe of the utility model.

[0032] Description of reference numerals:

[0033] 10-mounting seat; 11-injection cavity; 12-injection cavity; 13-injection hole; 14-ceramic plunger; 15-motor assembly; 151-linear motor; 152-connecting block; 153-connecting slot; 16-cavity cover; 17-screw; 18-sealing ring; 19-sealing ring;

[0034] 20- plunger body; 201- first drainage cone surface; 202- connection plug; 203- filling groove; 21- first connector; 211- small diameter section; 212- large diameter section; 213- step surface; 214- connection slot; 215- radial overflow hole; 216- second drainage cone surface; 22- second connector; 23- connection section; 24- connection groove. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0036] Example 1

[0037] like Figure 1-2 As shown, the ceramic plunger syringe of this embodiment includes a mounting seat 10, on which an injection cavity 11 is mounted, in which at least one injection cavity 12 is arranged, an injection hole 13 is arranged at the upper end of the injection cavity 12, and a ceramic plunger 14 slidingly matched therewith is arranged in the injection cavity 11. The mounting seat 10 of this embodiment is provided with a motor assembly 15 for driving the ceramic plunger 14 to reciprocate in the corresponding injection hole 13. In this embodiment, an injection cavity 12 is arranged in the injection cavity 11.

[0038] Specifically, the lower end of the injection cavity 11 of this embodiment is provided with a cavity cover plate 16, and the cavity cover plate 16 is fixedly mounted on the injection cavity 11 by screws 17. A sealing ring 18 is provided between the cavity cover plate 16 and the injection cavity 11 of this embodiment to ensure the sealing performance between the cavity cover plate 16 and the injection cavity 11. In the preferred implementation of this embodiment, at least one sealing ring 19 is provided between the lower end of the injection cavity 12 and the ceramic plunger 14. Specifically, the sealing ring 19 of this embodiment is provided as one to improve the sealing performance between the ceramic plunger 14 and the injection cavity 12 and prevent the reagent from leaking from the lower end of the injection cavity 12.

[0039] like Figure 3-4As shown, the ceramic plunger 14 of this embodiment includes a plunger body 20, and a plunger connecting rod is provided at the lower end of the plunger body 20. The plunger connecting rod includes a first connector 21 fixedly connected to the lower end of the plunger body 20 and a second connector 22 fixedly connected to the first connector 21. In this embodiment, a small diameter section 211 and a large diameter section 212 are provided on the first connector 21, and the small diameter section 211 is located on the side of the large diameter section 212 facing the plunger body 20. The outer diameter of the small diameter section 211 is smaller than the outer diameter of the large diameter section 212, and a step surface 213 is provided between the small diameter section 211 and the large diameter section 212. Specifically, in this embodiment, the outer diameter of the plunger body 20 is larger than the outer diameter of the small diameter section 211. The lower end surface of the plunger body 20 of this embodiment is set as a first drainage conical surface 201 for draining the reagent toward the step surface 213, that is, the reagent is drained along the first drainage conical surface 201 into the annular groove between the step surface 213 and the lower end surface of the plunger body 20, and crystallizes on the annular groove and the step surface 213, which can effectively prevent the accumulation of reagent crystals on the lower end surface of the plunger body 20. Since there is a gap between the step surface 213 and the lower end surface of the plunger body 20, it can be avoided that the reagent crystals are pushed into the injection cavity 12 with the reciprocating motion of the ceramic plunger to cause damage; and it can also prevent the disorderly spread of reagent crystals, causing large-area corrosion that cannot be cleaned, so as to achieve the purpose of facilitating the cleaning of reagent crystals and increasing the service life.

[0040] In this embodiment, the plunger body 20 is cylindrical and made of zirconium oxide ceramic. In this embodiment, the plunger connecting rod is made of stainless steel. In order to avoid corrosion of the reagent and the reagent crystallization to the stainless steel, in this embodiment, a Teflon coating is provided on the outer peripheral wall of the small diameter section 211 and the step surface 213.

[0041] In this embodiment, a connection slot 214 is provided on the top surface of the first connector 21, and a connection plug 202 matching the connection slot 214 is provided on the lower end surface of the plunger body 20, that is, in this embodiment, the first connector 21 and the plunger body 20 are plugged and connected through the connection slot 214 and the connection plug 202. In order to enhance the connection strength between the first connector 21 and the plunger body 20, in this embodiment, a filling slot 203 is provided around the connection slot 214 and the connection plug 202, and epoxy resin glue for bonding and fixing the connection slot 214 and the connection plug 202 is provided in the filling slot 203. Specifically, the filling slot 203 is set to at least one, and the filling slot 203 in this embodiment is set to one. Of course, in some other embodiments, the number of the filling slots 203 can also be set to 2 or more according to actual needs, which will not be repeated. In order to remove excess epoxy resin glue when the connection slot 214 and the connection plug 202 are plugged into each other, in this embodiment, a radial overflow hole 215 communicating with the connection slot 214 is provided on the outer wall of the first connector 21 .

[0042] In this embodiment, a connecting section 23 is provided between the second connecting head 22 and the first connecting head 21, the outer diameter of the first connecting head 21 and the outer diameter of the second connecting head 22 are both larger than the outer diameter of the connecting section 23, and a connecting groove 24 is formed between the first connecting head 21 and the second connecting head 22. In this embodiment, the motor assembly includes a linear motor 151, a linear guide rail (not shown in the figure) parallel to the output shaft of the linear motor 151, and a linear slider (not shown in the figure) slidably matched with the linear guide rail, the output shaft of the linear motor 151 is fixedly connected to the linear slider, and the linear guide rail is parallel to the axis of the ceramic plunger 14. The linear slider is provided with a connecting block 152, and the connecting block 152 and the connecting section 23 are provided with a connecting slot 153 correspondingly; the connecting section 23 is embedded in the connecting slot 153 and the connecting block 152 is located between the first connecting head 21 and the second connecting head 22. In this way, the linear motor 151 drives the linear slider and the connecting block 152 to move along the linear guide rail, and under the limiting cooperation between the first connecting head 21 and the second connecting head 22 and the connecting block 152, the ceramic plunger 14 can be driven to move in the injection cavity 11.

[0043] Example 2

[0044] like Figure 5-6 As shown, the ceramic plunger syringe of this embodiment includes a mounting seat 10, on which an injection cavity 11 is mounted, in which at least one injection cavity 12 is arranged, an injection hole 13 is arranged at the upper end of the injection cavity 12, and a ceramic plunger 14 slidingly matched therewith is arranged in the injection cavity 11. The mounting seat 10 of this embodiment is provided with a motor assembly 15 for driving the ceramic plunger 14 to reciprocate in the corresponding injection hole 13. In this embodiment, an injection cavity 12 is arranged in the injection cavity 11.

[0045] Specifically, the lower end of the injection cavity 11 of this embodiment is provided with a cavity cover plate 16, and the cavity cover plate 16 is fixedly mounted on the injection cavity 11 by screws 17. A sealing ring 18 is provided between the cavity cover plate 16 and the injection cavity 11 of this embodiment to ensure the sealing performance between the cavity cover plate 16 and the injection cavity 11. In the preferred implementation of this embodiment, at least one sealing ring 19 is provided between the lower end of the injection cavity 12 and the ceramic plunger 14. Specifically, the sealing ring 19 of this embodiment is provided as one to improve the sealing performance between the ceramic plunger 14 and the injection cavity 12 and prevent the reagent from leaking from the lower end of the injection cavity 12.

[0046] like Figure 7-8As shown, the ceramic plunger 14 of this embodiment includes a plunger body 20, and a plunger connecting rod is provided at the lower end of the plunger body 20. The plunger connecting rod includes a first connector 21 fixedly connected to the lower end of the plunger body 20 and a second connector 22 fixedly connected to the first connector 21. In this embodiment, a small diameter section 211 and a large diameter section 212 are provided on the first connector 21, and the small diameter section 211 is located on the side of the large diameter section 212 facing the plunger body 20. The outer diameter of the small diameter section 211 is smaller than the outer diameter of the large diameter section 212, and a step surface 213 is provided between the small diameter section 211 and the large diameter section 212. Specifically, in this embodiment, the outer diameter of the plunger body 20 is smaller than the outer diameter of the small diameter section 211, and the top peripheral wall of the small diameter section 211 is set as a second drainage conical surface 216 for draining the reagent toward the step surface 213, that is, the reagent is drained to the step surface 213 along the second drainage conical surface 216, and crystallizes on the step surface 213, which can effectively prevent the reagent crystals from accumulating on the lower end surface of the plunger body 20. Since there is a gap between the step surface 213 and the lower end surface of the plunger body 20, it can be avoided that the reagent crystals are pushed into the injection cavity 12 with the reciprocating motion of the ceramic plunger to cause damage; and it can also prevent the disorderly spread of the reagent crystals, causing large-area corrosion that cannot be cleaned, so as to achieve the purpose of facilitating the cleaning of the reagent crystals and increasing the service life.

[0047] Other specific implementations of this embodiment are the same or equivalent to those of Embodiment 1 and are not described one by one.

[0048] Example 3

[0049] like Fig. 9 As shown, the ceramic plunger syringe of this embodiment includes a mounting seat 10, on which an injection cavity 11 is mounted, at least one injection cavity 12 is provided in the injection cavity 11, an injection hole 13 is provided at the upper end of the injection cavity 12, and a ceramic plunger 14 slidingly matched therewith is provided in the injection cavity 11. The mounting seat 10 of this embodiment is provided with a motor assembly 15 for driving the ceramic plunger 14 to reciprocate in the corresponding injection hole 13. In this embodiment, two injection cavities 12 are provided in the injection cavity 11. In some other embodiments, the number of injection cavities 12 can also be set to three or more as needed, which will not be repeated.

[0050] Specifically, the ceramic plungers 14 installed in the two injection cavities 11 may be the same or different. Specifically, the ceramic plungers 14 installed in the two injection cavities 11 may both be the ceramic plungers 14 described in Example 1 or Example 2. In this embodiment, one of the ceramic plungers 14 installed in the two injection cavities 11 is the ceramic plunger 14 described in Example 1, and the other is the ceramic plunger 14 described in Example 2.

[0051] The ceramic plunger 14 of this embodiment includes a plunger body 20, and a plunger connecting rod is provided at the lower end of the plunger body 20. The plunger connecting rod includes a first connector 21 fixedly connected to the lower end of the plunger body 20 and a second connector 22 fixedly connected to the first connector 21. In this embodiment, a connecting section 23 is provided between the second connector 22 and the first connector 21, and the outer diameter of the first connector 21 and the outer diameter of the second connector 22 are both larger than the outer diameter of the connecting section 23, and a connecting groove 24 is formed between the first connector 21 and the second connector 22. In this embodiment, the motor assembly includes a linear motor 151, a linear guide (not shown in the figure) parallel to the output shaft of the linear motor 151, and a linear slider (not shown in the figure) slidably matched with the linear guide, the output shaft of the linear motor 151 is fixedly connected to the linear slider, and the linear guide is parallel to the axis of the ceramic plunger 14. The linear slider is provided with a connecting block 152, and the connecting block 152 and the connecting section 23 are provided with connecting slots 153 correspondingly; the connecting sections 23 of the two ceramic plungers 14 are respectively embedded in the corresponding connecting slots 153 and the connecting block 152 is located between the first connector 21 and the second connector 22. In this way, the linear motor 151 drives the linear slider and the connecting block 152 to move along the linear guide rail, and under the limiting cooperation between the first connector 21 and the second connector 22 and the connecting block 152, the two ceramic plungers 14 can be driven to move in the injection cavity 11.

[0052] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A ceramic plunger, characterized in that: The plunger body comprises a plunger connecting rod, the lower end of which is provided with a plunger connecting rod; the plunger connecting rod comprises a first connecting head fixedly connected to the lower end of the plunger body, the first connecting head is provided with a small diameter section and a large diameter section, the small diameter section is located on a side of the large diameter section facing the plunger body; the outer diameter of the small diameter section is smaller than the outer diameter of the large diameter section, and a step surface is provided between the small diameter section and the large diameter section; When the outer diameter of the plunger body is greater than the outer diameter of the small diameter section, the lower end surface of the plunger body is configured as a first drainage conical surface for draining the reagent toward the step surface; When the outer diameter of the plunger body is smaller than the outer diameter of the small-diameter section, the top outer peripheral wall of the small-diameter section is configured as a second drainage conical surface for draining the reagent toward the step surface.

2. The ceramic plunger according to claim 1, characterized in that: The plunger connecting rod is made of stainless steel, and the outer peripheral wall of the small diameter section and the step surface are provided with Teflon coating.

3. The ceramic plunger according to claim 1, characterized in that: A connecting slot is provided on the top surface of the first connecting head, and a connecting plug matched with the connecting slot is provided on the lower end surface of the plunger body.

4. The ceramic plunger according to claim 3, characterized in that: At least one surrounding filling groove is provided between the connection slot and the connection plug, and epoxy resin glue for bonding and fixing the connection slot and the connection plug is provided in the filling groove.

5. The ceramic plunger according to claim 4, characterized in that: A radial overflow hole communicating with the connecting slot is provided on the outer wall of the first connecting head.

6. The ceramic plunger according to any one of claims 1 to 5, characterized in that: The plunger connecting rod also includes a second connecting head, a connecting section is provided between the second connecting head and the first connecting head, the outer diameter of the first connecting head and the outer diameter of the second connecting head are both larger than the outer diameter of the connecting section, and a connecting groove is formed between the first connecting head and the second connecting head.

7. A ceramic plunger syringe, characterized in that: It comprises a mounting seat, on which an injection cavity is mounted, wherein at least one injection cavity is arranged in the injection cavity, an injection hole is arranged at the upper end of the injection cavity, and a ceramic plunger which slides with the injection cavity is arranged in the injection cavity; a motor assembly for driving the ceramic plunger to reciprocate in the corresponding injection hole is arranged on the mounting seat; the ceramic plunger adopts the ceramic plunger as described in any one of claims 1 to 6.

8. The ceramic plunger syringe according to claim 7, characterized in that: A cavity cover plate is provided at the lower end of the injection cavity, and a sealing ring is provided between the cavity cover plate and the injection cavity.

9. The ceramic plunger syringe according to claim 7, characterized in that: At least one sealing ring is provided between the lower end of the injection cavity and the ceramic plunger.

10. The ceramic plunger syringe according to any one of claims 7 to 9, characterized in that: The motor assembly comprises a linear motor, a linear guide rail parallel to the output shaft of the linear motor, and a linear slider slidably matched with the linear guide rail, and the output shaft of the linear motor is fixedly connected to the linear slider; The plunger connecting rod further includes a second connecting head, a connecting section is provided between the second connecting head and the first connecting head, the outer diameter of the first connecting head and the outer diameter of the second connecting head are both larger than the outer diameter of the connecting section, and a connecting groove is formed between the first connecting head and the second connecting head; The linear slider is provided with a connecting block, and the connecting block and the connecting section are provided with connecting slots correspondingly; the connecting section is embedded in the connecting slot and the connecting block is located between the first connector and the second connector.

Images