CN213254160U

CN213254160U - Stirrer and injection device

Info

Publication number: CN213254160U
Application number: CN202021573286.XU
Authority: CN
Inventors: 覃轩; 王雪莱; 龚文容
Original assignee: SCW MEDICATH Ltd
Current assignee: SCW MEDICATH Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-05-25
Anticipated expiration: 2030-07-31

Abstract

The stirrer comprises a spring stirring part and a connecting part which is arranged along the axial direction of the spring stirring part and is connected with the spring stirring part; the spring stirring part can penetrate through the injection head and extend into the injection sleeve, and the spring stirring part can be drawn out of the injection sleeve through the injection head; the connecting portion is capable of passing through and protruding out of the injection head. The stirrer can stir bone cement in the container through the small hole, and the bone cement is rapidly pumped out after stirring is completed, so that a larger time window is reserved for injection of the bone cement, and the situation that the injection time of the bone cement is improper, the operation effect is influenced, and even medical accidents are caused is avoided; when the spring stirring part rotates forwards, the bone cement can be fully driven to be mixed, and the stirring efficiency is higher; through the reverse rotation of the spring stirring part, the spring stirring part can be drawn out along the spiral path occupied by the spring stirring part in the bone cement, and the residual air bubbles in the bone cement are greatly reduced.

Description

Stirrer and injection device

Technical Field

The application relates to the technical field of medical instruments, in particular to a stirrer and an injection device.

Background

Vertebral compression fracture is the most common complication of osteoporosis patients, and the traditional open surgery treatment method has the defects of large trauma and many complications. Percutaneous Vertebroplasty (PVP) and Percutaneous Kyphoplasty (PKP) are novel minimally invasive surgical operations developed rapidly in recent years in spinal surgery, and the mechanical stability of a diseased vertebral body can be enhanced by directly injecting fillers such as bone cement and artificial bone into a compressed vertebral body percutaneously (or injecting fillers into the compressed vertebral body after balloon expansion first). The clinical application of percutaneous vertebroplasty and percutaneous kyphoplasty has proved that it is stable, reliable, rapid and effective in treatment, and has the advantage of not easy to cause complications.

In both percutaneous vertebroplasty and percutaneous kyphoplasty, a filler such as bone cement or artificial bone is injected into a patient body by using a syringe, and the bone cement needs to be stirred in advance before injection. In the traditional scheme, the stirring of bone cement is carried out with the stirring rod in a container, and the bone cement that finishes stirring can be filled in the syringe for the consistency of bone cement is difficult to control.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a stirrer and an injection device, and aims to solve the technical problem that the viscosity of traditional bone cement is difficult to control.

The stirrer comprises a spring stirring part and a connecting part, wherein the connecting part is arranged along the axial direction of the spring stirring part and is connected with the spring stirring part; the spring stirring part can penetrate through the injection head and extend into the injection sleeve, and the spring stirring part can be drawn out of the injection sleeve through the injection head; the connecting part can penetrate through and extend out of the injection head.

In one embodiment of the present application, the spring agitation portion includes a right-hand spring.

In one embodiment of the present application, the agitator further includes a rotating portion detachably connected to an end of the connecting portion remote from the spring agitating portion.

In one embodiment of the application, the outer side of the rotating part is provided with anti-skid lines; or the outer side of the rotating part is provided with an external thread; or, the rotating part is a regular hexagonal prism.

It is another object of the present application to provide an injection device comprising the stirrer as described above, further comprising an injection sleeve, an injection head connected to one end of the injection sleeve, and an injection push rod assembly disposed at one end of the injection sleeve remote from the injection head.

In one embodiment of the present application, the injection push rod assembly includes a threaded push rod disposed along an axial direction of the injection sleeve and provided with an external thread, a push rod head connected to an end of the threaded push rod opposite to the injection head, and a handle connected to an end of the threaded push rod away from the push rod head; the injection push rod assembly further comprises a supporting piece connected with the injection sleeve and a speed limiting assembly connected with the supporting piece, and the speed limiting assembly is provided with an internal thread matched with the external thread of the threaded push rod.

In one embodiment of the present application, the push rod head includes a connecting rod portion connected to the threaded push rod and capable of rotating together with the threaded push rod, a push head portion hinged to the connecting rod portion and disposed at an end of the connecting rod portion away from the threaded push rod, and a sealing ring disposed around the push head portion; the outer side of the push head part is provided with a sealing groove for positioning the sealing ring, and the sealing groove surrounds the axis of the threaded push rod.

In one embodiment of the application, the speed limiting assembly comprises a first speed limiting piece and a second speed limiting piece which are arranged on two opposite sides of the threaded push rod, and the first speed limiting piece and the second speed limiting piece can be close to or far away from each other.

In one embodiment of the present application, the first speed limiting member is provided with a first limiting hole, the second speed limiting member is provided with a second limiting hole opposite to the first limiting hole, and the supporting member includes a limiting rod portion extending into the first limiting hole and the second limiting hole; the injection push rod assembly further comprises a speed change part movably connected with the support part, the speed change part is provided with a first waist hole and a second waist hole opposite to the first waist hole, the first speed limit part comprises a first boss extending into the first waist hole, the second speed limit part comprises a second boss extending into the second waist hole, and the length direction of the first waist hole and the length direction of the second waist hole form a preset included angle.

In one embodiment of the present application, the injection push rod assembly further includes a return spring disposed along an axial direction of the threaded push rod, and one end of the return spring is connected to the transmission.

The stirrer provided by any embodiment of the application has at least the following beneficial effects:

aiming at the characteristics of the bone cement, the stirrer provided by any embodiment of the application can extend into the injection sleeve to stir the bone cement, can stir the bone cement in the mixing period and the silk-sticking period of the bone cement, and can be rapidly drawn out when the bone cement enters the dough period, so that a larger time window is reserved for the injection of the bone cement, thereby preventing the bone cement from being injected too early or too late, and avoiding the improper injection time of the bone cement from influencing the operation effect and even causing medical accidents; when the spring-shaped spring stirring part rotates forwards, the bone cement can be fully driven to be mixed, the stirring efficiency is higher, and the stirring is more uniform; when the spring stirring part needs to be extracted along with the increase of the viscosity of the bone cement, the spring stirring part can be extracted along the spiral path occupied by the spring-shaped spring stirring part in the bone cement through the reverse rotation of the spring-shaped spring stirring part, and the residual air bubbles in the bone cement are greatly reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a blender provided in an embodiment of the present application;

FIG. 2 is a partial cross-sectional view of an agitator extending through an injector head and into an injection cannula according to one embodiment of the present application;

FIG. 3 is a schematic structural view of an injection device provided by an embodiment of the present application;

FIG. 4 is a schematic view of the internal structure of an injection device provided by an embodiment of the present application;

FIG. 5 is an enlarged partial schematic view of the internal structure of the injection device with the first rate limiting member and the second rate limiting member spaced away from each other according to one embodiment of the present application;

FIG. 6 is an enlarged partial schematic view of the internal structure of the injection device with the first restrictor and the second restrictor in close proximity to each other according to one embodiment of the present application.

Reference numerals referred to in the above figures are detailed below:

1-an injection push rod assembly; 11-a support; 111-a limit rod part; 12-a threaded push rod; 13-a putter head; 131-a link portion; 132-push head; 1321-seal groove; 133-sealing ring; 14-a handle; 15-a speed limiting assembly; 151-first speed limiting member; 1511-first limiting hole; 1512-a first boss; 152-a second speed limiting member; 1522-a second boss; 16-a transmission; 161-first waist hole; 162-second waist hole; 163-a pushing part; 21-an injection cannula; 22-an injection head; 3-a stirrer; 31-a spring stirring part; 32-a connecting portion; 33-rotating part.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

In order to explain the technical solutions of the present application, the following detailed descriptions are made with reference to specific drawings and examples.

Referring to fig. 1 and 2, an embodiment of the present application provides a stirrer 3, including a spring stirring portion 31, and a connecting portion 32 disposed along an axial direction of the spring stirring portion 31 and connected to the spring stirring portion 31; the spring stirring part 31 can penetrate through the injection head 22 and extend into the injection sleeve 21, and the spring stirring part 31 can be drawn out from the injection sleeve 21 through the injection head 22; the connector 32 is capable of passing through and extending out of the injector head 22.

The existing bone cement has various main components, and in the embodiments of the present application, a polymer PMMA formed by mixing Polymethyl methacrylate (PMMA) powder and Methyl Methacrylate (MMA) monomer liquid and then self-polymerizing and curing under certain conditions is taken as an example. As time goes on, the self-polymerization of PMMA and MMA goes through four stages of a mixing period, a silk-sticking period, a dough period and a curing period in sequence, the viscosity of the bone cement is increased in the mixing period, the silk-sticking period and the dough period, and the bone cement is completely hardened in the curing period. The bone cement should be injected into the patient in the agglomeration period, if the injection is too early, the injection of the bone cement can diffuse too much MMA into the patient, and the MMA has lipophilicity and cytotoxicity, so that a large monomer reaction exists in the patient, and in some cases, the bone cement can be caused to be embolism, so that the risk is high; if injected too late, the cement can enter the setting phase and harden during and even before injection, resulting in a failed procedure and delaying the timing of the treatment.

The stirrer 3 provided in the present embodiment has many technical effects in view of the above characteristics of the bone cement.

Specifically, the stirrer 3 provided in the present embodiment operates as follows:

referring to fig. 1 and 2, the mixer 3 of the present embodiment can be used for mixing bone cement in a conventional container; more importantly, however, the bone cement in the injection sleeve 21 can be directly stirred by first inserting the end of the connecting part 32 far away from the spring stirring part 31 into the end of the injection head 22 opposite to the injection sleeve 21 and then mounting the injection head 22 on the injection sleeve 21.

During the stirring, the spring stirring portion 31 may be rotated through the connection portion 32. The spring stirring part 31 rotates positively during the stirring process, that is, clockwise rotation is applied to the right-handed spring stirring part 31 (clockwise when viewed from the side of the connecting part 32 away from the spring stirring part 31, and both counterclockwise rotation and clockwise rotation of the spring stirring part 31 mentioned throughout this document are based on the result when viewed from the side of the connecting part 32 away from the spring stirring part 31), or counterclockwise rotation is applied to the left-handed spring stirring part 31; this can drive the PMMA, which is deposited at the bottom of the MMA due to its greater density, to move toward the end facing the mouth of the container or the injection head 22 (the injection head 22 is placed upwards during the stirring process to avoid the outflow of bone cement), so that the PMMA and MMA are mixed thoroughly.

After the stirring is finished, the bone cement has higher viscosity. At this time, without directly lifting the spring stirring part 31 upward from the bone cement, the spring stirring part 31 may be rotated in the reverse direction so that the spring stirring part 31 is drawn out along the spiral path itself occupies in the bone cement to reduce the remaining air bubbles in the bone cement; in the case where the mixer 3 is used for mixing the bone cement in the injection sleeve 21, the injection head 22 does not need to be detached from the injection sleeve 21, and the spring mixing portion 31 may be drawn out while the spring mixing portion 31 is rotated in the reverse direction.

The implementation of the stirrer 3 provided by the embodiment has at least the following beneficial technical effects:

the stirrer 3 provided by the embodiment can extend into the injection sleeve 21 to stir bone cement, can stir the bone cement in a mixing period and a wire bonding period of the bone cement, and can be rapidly drawn out when the bone cement enters a dough period, so that a larger time window is reserved for the injection of the bone cement, thereby preventing the bone cement from being injected too early or too late, and avoiding that the injection time of the bone cement is improper to influence the operation effect and even cause medical accidents; when the spring-shaped spring stirring part 31 rotates forwards, PMMA powder and MMA liquid at the bottom of a container such as the injection sleeve 21 can be fully driven to be mixed, so that the stirring efficiency is higher, and the stirring is more uniform; when the spring stirring part 31 needs to be extracted along with the increase of the viscosity of the bone cement, the spring stirring part 31 can be extracted along the spiral path which the spring stirring part 31 occupies in the bone cement by the reverse rotation of the spring-shaped spring stirring part 31, and the residual air bubbles in the bone cement are greatly reduced.

The stirrer 3 provided in this embodiment is very suitable for stirring bone cement in the injection cannula 21, is also suitable for stirring other containers or other substances, and can achieve the technical effects of being capable of extending into and stirring from the small hole, improving stirring efficiency and reducing residual bubbles.

As a specific aspect of the present embodiment, the spring stirring portion 31 is made of a plastic material. The plastic material can deform obviously under the action of external force without being damaged or broken, and the phenomenon that the spring stirring part 31 is broken to influence subsequent injection work in the process of extracting the plastic material from the bone cement after the stirrer 3 finishes stirring can be avoided; this is of great significance in the case where the spring stirring portion 31 is extended into the injection sleeve 21 to stir the bone cement and needs to be withdrawn through the injection head 22, and it is possible to prevent the spring stirring portion 31 from being broken and remaining in the injection sleeve 21.

Referring to fig. 1 and 2, in one embodiment of the present application, the spring stirring portion 31 includes a right-handed spring. To dextrorotation spring, clockwise rotation can realize the stirring to bone cement, and anticlockwise rotation can take out spring stirring portion 31 from bone cement, has more excellent man-machine efficiency, uses the agitator 3 that this embodiment provided to carry out the operation and more accords with the user to the use custom of all kinds of article, reduces the work error, improves security and work efficiency.

Specifically, in the present embodiment, the spring stirring portion 31 may be a single right-handed spring connected to the connecting portion 32, or may be a plurality of right-handed springs connected to the same end of the connecting portion 32, and the plurality of right-handed springs are coaxially and symmetrically disposed along the axis of the spring stirring portion 31. The stirring efficiency of bone cement can be further improved by arranging the plurality of right-handed springs. It is also feasible that the spring stirring part 31 further comprises a plurality of left-handed springs, and the left-handed springs and the right-handed springs are coaxially arranged and are mutually nested, so that convection can be formed in the stirring process, and when the densities of various substances to be stirred are similar, a more excellent stirring effect is achieved.

Referring to fig. 1 and 2, in one embodiment of the present application, the stirrer 3 further includes a rotating portion 33 detachably connected to an end of the connecting portion 32 away from the spring stirring portion 31. Specifically, the rotating portion 33 and the connecting portion 32 may be screwed or snapped.

The bone cement in the injection sleeve 21 can be directly stirred by firstly penetrating one end of the connecting part 32 far away from the spring stirring part 31 from one end of the injection head 22 facing the injection sleeve 21 and then installing the injection head 22 on the injection sleeve 21.

The rotating part 33 is provided, so that an operator can conveniently hold the rotating part 33 to rotate the spring stirring part 31, and the stirrer 3 is conveniently connected with a power device and can stir bone cement through mechanical force; after the completion of the mixing, if the mixer 3 cannot be extracted through the connection part 32 due to the high viscosity of the bone cement, the whole mixer 3 can be extracted from the bone cement through the rotation part 33, thereby avoiding delay of the injection timing of the bone cement.

As a more preferable scheme of the present embodiment, when the agitator 3 is rotated manually by the operator, the outer side of the rotating portion 33 is provided with anti-slip lines, which facilitates the rotation of the agitator 3 by the operator; when the stirrer 3 is provided with a corresponding stirring device or stirring equipment, the outer side of the rotating part 33 is provided with an external thread, or the rotating part 33 is a regular hexagonal prism, so as to facilitate connection with a corresponding joint of the stirring device or stirring equipment.

Referring to fig. 3, in an embodiment of the present application, the present application further provides an injection device, which includes the stirrer 3 as described above, an injection sleeve 21, an injection head 22 connected to an end of the injection sleeve 21, and an injection push rod assembly 1 disposed at an end of the injection sleeve 21 far from the injection head 22.

The injection pusher rod assembly 1 has a pusher rod or threaded pusher rod 12 that is capable of extending into the injection sleeve 21 from an end of the injection sleeve 21 remote from the injector head 22. The injection device is specifically operated by firstly retracting the push rod or the threaded push rod 12 to one end of the injection sleeve 21, which is far away from the end of the injection sleeve 22, adding PMMA and MMA into the injection sleeve 21 from the end of the injection sleeve 21, which is provided with the injection head 22, penetrating one end of the connecting part 32, which is far away from the spring stirring part 31, from one end of the injection head 22, which is opposite to the injection sleeve 21, then installing the injection head 22 on the injection sleeve 21, stirring the bone cement in the injection sleeve 21 by using the stirrer 3, withdrawing the stirrer 3 after the stirring is finished, and finally injecting the bone cement after pushing out the residual air in the injection sleeve 21 by the push rod or the threaded push rod 12.

Referring to fig. 3 and 2, as a specific solution of this embodiment, the injection head 22 may be screwed with the injection sleeve 21, and a luer male connector may be provided on a side of the injection head 22 away from the injection sleeve 21 to facilitate connection with other equipment provided with a corresponding luer female connector, so as to inject the cement in the injection head 22 into the patient through the luer male and female connector.

Referring to fig. 3 to 6, in one embodiment of the present application, the injection plunger assembly 1 includes a threaded plunger 12 disposed along an axial direction of the injection sleeve 21 and provided with an external thread, a plunger head 13 connected to an end of the threaded plunger 12 opposite to the injection head 22, and a handle 14 connected to an end of the threaded plunger 12 away from the plunger head 13; the injection push rod assembly 1 further comprises a supporting member 11 connected with the injection sleeve 21, and a speed limiting assembly 15 connected with the supporting member 11, wherein the speed limiting assembly 15 is provided with an internal thread matched with the external thread of the threaded push rod 12.

In this embodiment, the speed-limiting assembly 15, the supporting member 11 and the injection sleeve 21 are not rotatable, an operator can rotate the threaded push rod 12 through the handle 14, and the rotating torque of the threaded push rod 12 is converted into the driving force of the threaded push rod 12 to the bone cement in the injection sleeve 21 through the threaded fit of the threaded push rod 12 and the speed-limiting assembly 15, so that the driving force to the bone cement in the injection sleeve 21 can be improved, and the injection rate of the bone cement can be more uniform.

Referring to fig. 4, in an embodiment of the present application, the push rod head 13 includes a connecting rod portion 131 connected to the threaded push rod 12 and capable of rotating together with the threaded push rod 12, a push head portion 132 hinged to the connecting rod portion 131 and disposed at an end of the connecting rod portion 131 far away from the threaded push rod 12, and a sealing ring 133 disposed around the push head portion 132; the outside of the push head 132 is provided with a sealing groove 1321 for positioning the sealing ring 133, and the sealing groove 1321 is arranged around the axis of the threaded push rod 12.

Thus, when the threaded push rod 12 rotates, the sealing ring 133 and the pushing head 132 bearing the sealing ring 133 do not rotate, the sealing ring 133 is fixed by the sealing groove 1321, and only moves along with the pushing head 132 along the axial direction of the threaded push rod 12, so that not only is the friction energy consumption of the sealing ring 133 and the inner wall of the injection sleeve 21 reduced, but also the influence of the rotation of the sealing ring 133 on the sealing performance can be avoided.

As a specific solution of this embodiment, the pushing head part 132 can rotate relative to the connecting rod part 131 around the axial direction of the threaded pushing rod 12; the link portion 131 may be connected to the threaded rod 12 through a D-shaped hole, a kidney-shaped hole, a hexagonal hole, or the like, or may be engaged with the threaded rod 12.

Referring to fig. 3 to 6, in an embodiment of the present application, the speed limiting assembly 15 includes a first speed limiting member 151 and a second speed limiting member 152 disposed on opposite sides of the threaded push rod 12, and the first speed limiting member 151 and the second speed limiting member 152 can be close to or far from each other.

Referring to fig. 3 to 6, in the present embodiment, the threaded push rod 12 of the injection push rod assembly 1 has an external thread, and the speed limiting assembly 15 connected to the supporting member 11 has an internal thread matching with the external thread of the threaded push rod 12. The speed-limiting assembly 15 comprises a first speed-limiting part 151 and a second speed-limiting part 152 which are arranged on two opposite sides of the threaded push rod 12, when the first speed-limiting part 151 and the second speed-limiting part 152 are close to each other until the speed-limiting assembly 15 is in threaded fit with the threaded push rod 12, the threaded push rod 12 cannot be directly pushed, the threaded push rod 12 can only be rotated by rotating the handle 14, the rotating torque of the threaded push rod 12 is converted into the pushing force of the threaded push rod 12 on the bone cement in the injection sleeve 21 through the threaded fit of the threaded push rod 12 and the speed-limiting assembly 15, and at the moment, the pushing force of the threaded push rod 12 on the bone cement in the injection sleeve 21 is high; when the first speed limiting member 151 and the second speed limiting member 152 are far away from each other until the internal thread of the speed limiting assembly 15 is disengaged from the external thread of the threaded push rod 12, the threaded push rod 12 can be directly pushed, and at the moment, the threaded push rod 12 can push the bone cement in the injection casing 21 at a higher speed and efficiency.

Different bone cements have different injection timings and time windows, and the viscosities of different bone cements at the time of injection are also different. The injection push rod assembly 1 provided by the embodiment can control the injection efficiency of the injection push rod assembly 1 through the matching of the speed limiting assembly 15 and the threaded push rod 12, can select the injection mode of bone cement according to the actual conditions such as the components, viscosity and the like of the bone cement, and has strong applicability; medical staff can switch the bone cement injection mode and injection speed at any time according to the viscosity of the bone cement, so that the phenomenon that the injection time window of the bone cement is missed is avoided, and the phenomenon that the injection time of the bone cement is missed or the injection speed of the bone cement is too fast and the like influences the operation effect and even causes medical accidents is prevented; in the preparation process of the injection device, the first speed limiting part 151 and the second speed limiting part 152 can be separated to realize the quick insertion and extraction of the threaded push rod 12, so that the efficiency of the preparation work of bone cement injection is improved.

Referring to fig. 3 to 6, in an embodiment of the present application, the first speed limiting member 151 is provided with a first limiting hole 1511, the second speed limiting member 152 is provided with a second limiting hole (not shown) opposite to the first limiting hole 1511, and the supporting member 11 includes a limiting rod portion 111 extending into the first limiting hole 1511 and the second limiting hole.

Thus, the limit rod part 111 can function as a guide rail for the first speed limiting member 151 and the second speed limiting member 152, and the first speed limiting member 151 and the second speed limiting member 152 are movably connected with the limit rod part 111 and can move along the limit rod part 111 to be close to or far away from each other; when the first speed limiting part 151 and the second speed limiting part 152 approach each other until the speed limiting assembly 15 is in threaded fit with the threaded push rod 12, the threaded push rod 12 cannot be directly pushed, the threaded push rod 12 can only be rotated by rotating the handle 14, and the rotation torque of the threaded push rod 12 is converted into the pushing force of the threaded push rod 12 on the bone cement in the injection sleeve 21 through the threaded fit of the threaded push rod 12 and the speed limiting assembly 15, so that the pushing force of the threaded push rod 12 on the bone cement in the injection sleeve 21 is high and the injection rate is more uniform; when the first speed limiting member 151 and the second speed limiting member 152 are far away from each other until the internal thread of the speed limiting assembly 15 is disengaged from the external thread of the threaded push rod 12, the threaded push rod 12 can be directly pushed, and at the moment, the threaded push rod 12 can push the bone cement in the injection casing 21 at a higher speed and efficiency.

Referring to fig. 3 to 6, in an embodiment of the present application, the injection push rod assembly 1 further includes a speed changing member 16 movably connected to the support member 11, the speed changing member 16 is provided with a first waist hole 161 and a second waist hole 162 opposite to the first waist hole 161, the first speed limiting member 151 includes a first boss 1512 extending into the first waist hole 161, the second speed limiting member 152 includes a second boss 1522 extending into the second waist hole 162, and a length direction of the first waist hole 161 and a length direction of the second waist hole 162 form a predetermined included angle.

As a specific scheme of this embodiment, the limiting rod is disposed perpendicular to the threaded push rod 12, an included angle between the length direction of the first waist hole 161 and the axial direction of the threaded push rod 12 ranges from 5 ° to 15 °, and an included angle between the length direction of the second waist hole 162 and the axial direction of the threaded push rod 12 ranges from 5 ° to 15 °; one end of the first waist hole 161 close to the injection sleeve 21 is closer to the threaded push rod 12, and one end of the second waist hole 162 close to the injection sleeve 21 is closer to the threaded push rod 12; the transmission 16 has a pushing portion 163 protruding out of the support 11. Specifically, the angle between the length direction of the first waist hole 161 and the axial direction of the threaded push rod 12 may be 12 °, and the angle between the length direction of the second waist hole 162 and the axial direction of the threaded push rod 12 may be 12 °. Such an angle range is set reasonably, and the urging force of the transmission 16 in the axial direction of the threaded push rod 12 can be well converted into the approaching and departing urging forces of the first speed-limiting member 151 and the second speed-limiting member 152.

Referring to fig. 3 to 6, the first boss 1512 extends into the first waist hole 161 and slides along the first waist hole 161, the second boss 1522 extends into the second waist hole 162 and slides along the second waist hole 162, and the positions of the first speed limiting member 151 and the second speed limiting member 152 in the axial direction of the threaded push rod 12 are fixed by the limiting rod. In this way, the pushing part 163 pushes the transmission 16 toward the end close to the injection sleeve 21, so that the first speed limiter 151 and the second speed limiter 152 can be moved away from each other, and the bone cement can be rapidly injected; the speed change part 16 is pushed to one end far away from the injection sleeve 21 through the pushing part 163, so that the first speed limiting part 151 and the second speed limiting part 152 can be close to each other until the speed limiting assembly 15 and the threaded push rod 12 realize threaded fit, bone cement can be pushed by rotating the threaded push rod 12, the injection force is improved, and the injection rate is more uniform.

In one embodiment of the present application, the injection push rod assembly 1 further comprises a return spring (not shown) disposed along the axial direction of the threaded push rod 12, one end of the return spring being connected to the transmission 16. The reset spring can realize the reset function of the speed change part 16, and can enable the speed change part 16 to automatically reset to a certain state under the action of no external force, so that the injection device can reset to the state of pushing the threaded push rod 12 to inject under the action of no external force, or the injection device can reset to the state of rotating the threaded push rod 12 to inject under the action of no external force.

As a preferable scheme of the embodiment, the injection device can be reset to the state of rotating the threaded push rod 12 to inject without external force, and the acting force of the reset spring can also ensure that the threaded matching of the speed limiting assembly 15 and the threaded push rod 12 is firmer.

As a specific scheme of this embodiment, the speed changing member 16 is provided with a through hole for the threaded push rod 12 to pass through, the return spring is arranged in parallel with the threaded push rod 12, one end of the return spring is connected to one side of the speed changing member 16 close to the injection sleeve 21, the other end of the return spring is connected to one side of the speed limiting assembly 15 opposite to the injection sleeve 21, and the return spring is always in a compressed state; or, the speed changing part 16 is provided with a through hole for the threaded push rod 12 to pass through, the return spring is arranged in parallel with the threaded push rod 12, one end of the return spring is connected with one side of the speed changing part 16 back to the injection sleeve 21, the other end of the return spring is connected with the support part 11, and the return spring is always in a stretching state.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The stirrer is characterized by comprising a spring stirring part and a connecting part which is arranged along the axial direction of the spring stirring part and is connected with the spring stirring part; the spring stirring part can penetrate through the injection head and extend into the injection sleeve, and the spring stirring part can be drawn out of the injection sleeve through the injection head; the connecting part can penetrate through and extend out of the injection head.

2. The agitator of claim 1, wherein the spring agitator portion comprises a right-hand spring.

3. The agitator of claim 1, further comprising a rotating portion removably coupled to an end of the coupling portion remote from the spring agitator portion.

4. The agitator of claim 3, wherein the outside of the rotating portion is provided with an anti-slip pattern; or the outer side of the rotating part is provided with an external thread; or, the rotating part is a regular hexagonal prism.

5. An injection device comprising an agitator according to any of claims 1-4, the injection device further comprising an injection sleeve, an injection head connected to an end of the injection sleeve, and an injection ram assembly disposed at an end of the injection sleeve remote from the injection head.

6. The injection device as claimed in claim 5, wherein the injection push rod assembly comprises a threaded push rod provided with an external thread along the axial direction of the injection sleeve, a push rod head connected to an end of the threaded push rod opposite to the injection head, and a handle connected to an end of the threaded push rod remote from the push rod head; the injection push rod assembly further comprises a supporting piece connected with the injection sleeve and a speed limiting assembly connected with the supporting piece, and the speed limiting assembly is provided with an internal thread matched with the external thread of the threaded push rod.

7. The injection device as claimed in claim 6, wherein the push rod head comprises a connecting rod part connected with the threaded push rod and capable of rotating together with the threaded push rod, a push head part hinged with the connecting rod part and arranged at one end of the connecting rod part far away from the threaded push rod, and a sealing ring arranged around the push head part; the outer side of the push head part is provided with a sealing groove for positioning the sealing ring, and the sealing groove surrounds the axis of the threaded push rod.

8. The injection device of claim 6, wherein said speed limiting assembly includes first and second speed limiting members disposed on opposite sides of said threaded push rod, said first and second speed limiting members being capable of moving toward and away from each other.

9. The injection device as claimed in claim 8, wherein the first speed limiting member is provided with a first limiting hole, the second speed limiting member is provided with a second limiting hole opposite to the first limiting hole, and the support member comprises a limiting rod part extending into the first limiting hole and the second limiting hole; the injection push rod assembly further comprises a speed change part movably connected with the support part, the speed change part is provided with a first waist hole and a second waist hole opposite to the first waist hole, the first speed limit part comprises a first boss extending into the first waist hole, the second speed limit part comprises a second boss extending into the second waist hole, and the length direction of the first waist hole and the length direction of the second waist hole form a preset included angle.

10. The injection device as defined in claim 9, wherein said injection pusher bar assembly further comprises a return spring disposed along an axial direction of said threaded pusher bar, one end of said return spring being connected to said transmission.