CN214342531U - Sternal medullary cavity injector - Google Patents

Abstract

The utility model discloses a breastbone pulp cavity injector, include: a limiting clamp, a sternum medullary cavity puncture needle and a hand drill type power handle; the first end of the sternal medullary cavity puncture needle is connected with a hand drill type power handle, and after the connection, the hand drill type power handle can drive the sternal medullary cavity puncture needle to rotate; the limiting clamp can be clamped on the second end of the sternum medullary cavity puncture needle; the sternum medullary cavity puncture needle comprises: the needle core piece, the needle tubing piece, fixer and stopper. The utility model relates to a breastbone marrow cavity injector, simple structure, convenient operation, can safe and stable establish marrow cavity infusion passageway effectively, reduce patient's misery, improve first aid efficiency.

Description

Sternal medullary cavity injector

Technical Field

The utility model belongs to the field of medical first-aid equipment, in particular to a breastbone marrow cavity injector.

Background

When a critically ill patient suffers from shock, the peripheral vein collapse can cause difficulty in establishing the infusion channel in a conventional peripheral vein puncture mode, the rescue efficiency is seriously influenced, and the infusion channel can be established in a quick and effective marrow cavity puncture mode. In emergency medical treatment environments such as disaster rescue or pre-hospital first aid, the bone marrow cavity injection is safe and rapid, so that people can be treated in a short time. At present, the marrow cavity puncture transfusion modes commonly used at home and abroad comprise ejection type marrow cavity puncture transfusion of tibia, humerus and sternum and drilling type marrow cavity puncture transfusion of tibia and humerus.

The common marrow cavity puncture instrument in the market at present mainly comprises an ejection type and a drilling type. The ejection type marrow cavity puncture needle has two products abroad, one is B.I.G special for puncturing tibia and humerus, the other is F.A.S.T special for puncturing sternum, the ejection type marrow cavity puncture needle has the advantages of convenient and quick use, and the defects that the infusion speed is not as high as that of the sternum, the puncture success rate is not as good as that of a hand drill type, the ejection type marrow cavity puncture needle enters a marrow cavity by a spring in the puncture process, no pressure feedback exists in the process, and a user cannot master the puncture force.

The drilling type marrow cavity puncture needle is mainly EZ-IO abroad. EZ-IO has the advantages that pressure feedback during drilling into the bone can be sensed at any time along with the drilling process, and a user can know the degree of puncture, and the puncture needle has a drilling empty feeling after entering a bone marrow cavity, but the EZ-IO cannot be applied to sternal puncture because the EZ-IO has no enough safety means.

The sternum part is rich in high-quality bone marrow, but due to the use mode, at present, no drilling type puncture transfusion device which is simple and convenient to operate, controllable in puncture force and safe to use exists.

SUMMERY OF THE UTILITY MODEL

The utility model provides a breastbone pulp cavity injector, include: a limiting clamp, a sternum medullary cavity puncture needle and a hand drill type power handle;

the first end of the sternum medullary cavity puncture needle is connected with the hand drill type power handle, and after the connection, the hand drill type power handle can drive the sternum medullary cavity puncture needle to rotate;

the limiting clamp can be clamped on the second end of the sternum medullary cavity puncture needle;

the sternum medullary cavity puncture needle comprises: the needle core piece, the needle tube piece, the fixer and the limiter;

the first end of the needle core piece is provided with a connecting piece, the second end of the needle core piece is provided with an outer conical joint, and the center of the second end of the needle core piece is provided with a needle core;

the needle tube piece comprises a needle tube seat, a clamping seat and a needle tube;

the needle tube base is provided with an inner conical joint, and the inner conical joint is matched with the outer conical joint; the needle core piece and the needle tube piece can be connected with the outer conical joint through the inner conical joint;

the needle tube seat is fixedly connected with the clamping seat, and a first thread and a second thread are arranged on the clamping seat;

the needle tube fitting is provided with a through hole, the needle tube is arranged in the through hole of the needle tube fitting, the needle tube is of a hollow needle-shaped structure, the needle core of the needle core piece can be inserted into the needle tube, and the direction of the needle head of the needle tube is the same as that of the clamping seat;

the fixer is provided with a through hole, a first internal thread is arranged in the through hole of the fixer, the first internal thread is matched with the first thread, and the fixer can be fixed on the clamping seat;

the stopper first end is provided with second internal thread interface, second internal thread interface with second screw-thread fit, the stopper can be fixed to on the cassette through second internal thread interface, the stopper still is provided with and runs through the through-hole, the needle tubing can insert the stopper runs through in the through-hole.

Further, the external cone connector is a 6% luer external cone connector with a locking connector;

the inner conical joint is a 6% luer inner conical joint with a locking joint.

Further, the length of the needle core is larger than that of the needle tube;

when the needle core piece is connected with the needle tube piece, the needle point of the needle core piece can penetrate out of the needle tube.

Further, after the needle core piece is connected with the needle tube piece, the needle core is matched with the needle tube to form the triangular needle.

Furthermore, the hand drill type power handle is provided with a power output port, the power output port is matched with the connecting piece, and the connecting piece can be inserted into the power output port;

a power assembly is arranged in the hand drill type power handle and can drive the connecting piece to rotate;

the hand drill type power handle further comprises a power switch, and the power switch is arranged on one side of the shell of the hand drill type power handle; the power switch is used for switching on/off the power assembly of the hand drill type power handle.

Further, the hand drill power handle further comprises a control assembly capable of controlling the coupling rotational speed and/or torque.

Furthermore, a pressure trigger starting assembly is further arranged in the hand drill type power handle;

the pressure trigger starting assembly can receive the feedback pressure of the sternum medullary cavity puncture needle;

when the pressure is smaller than the first pressure value, the pressure trigger starting assembly can stop the power assembly;

when the pressure is larger than or equal to the first pressure value, the pressure triggers the starting assembly to start the power assembly.

Furthermore, after the power switch is turned on, the pressure trigger starting assembly only starts the power assembly once due to pressure trigger.

Furthermore, the hand drill type power handle also comprises a power interface, and the power interface is arranged on one side of the shell of the hand drill type power handle;

the power interface is used for supplying power to the hand drill type power handle after being connected with a power supply;

the hand drill type power handle also comprises a rechargeable battery, wherein the rechargeable battery is arranged in the hand drill type power handle and is used for supplying power to the hand drill type power handle;

the power interface is also used for charging the rechargeable battery after being connected with a power supply.

Furthermore, the thickness of the limiting clamp is 4-6 cm.

The utility model relates to a breastbone marrow cavity injector, simple structure, convenient operation, can safe and stable establish marrow cavity infusion passageway effectively, reduce patient's misery, improve first aid efficiency.

Drawings

Fig. 1 is a schematic structural view of an injector for the medullary cavity of sternum according to an embodiment of the present invention;

FIG. 2 is a schematic view showing the structure of the sternum medullary cavity puncture needle according to the embodiment of the present invention;

FIG. 3 is a schematic view showing the explosion of the sternum medullary cavity puncture needle according to the embodiment of the present invention;

fig. 4 shows a schematic structural view of a stylet of an embodiment of the invention;

FIG. 5 is a schematic view of a needle cannula assembly according to an embodiment of the present invention;

fig. 6 shows a schematic structural view of a fastener according to an embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a stopper according to an embodiment of the present invention.

In the figure: 1. a limiting clamp; 2. a sternal medullary cavity puncture needle; 21. a needle core member; 22. a needle tubing member; 221. a needle tube base; 222. a first thread; 223. a second thread; 224. a needle tube; 23. a holder; 24. a stopper; 3. hand drill formula power handle.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. The utility model is mainly used for the injection of the marrow cavity of the sternum and also can be used for the puncture injection of the marrow cavity of the humerus and the tibia. The utility model provides a sternum pulp cavity injector, sternum pulp cavity injector includes: a limiting clamp 1, a sternum medullary cavity puncture needle 2 and a hand drill type power handle 3. The first end of the sternum medullary cavity puncture needle 2 is connected with the hand drill type power handle 3, and after the connection, the hand drill type power handle 3 can drive the sternum medullary cavity puncture needle 2 to rotate; the limiting clamp 1 can be clamped on the second end of the sternum medullary cavity puncture needle 2.

Exemplarily, as shown in fig. 1, the present invention relates to a sternum medullary cavity injector, which comprises a limiting clamp 1, a sternum medullary cavity puncture needle 2 and a hand drill type power handle 3. The limiting clamp 1 is used for controlling the puncture depth, the sternum medullary cavity puncture needle 2 is used for puncture and subsequent transfusion, and the hand drill type power handle 3 is used for providing power for the sternum medullary cavity puncture needle 2. The first end of the sternum medullary cavity puncture needle 2 is connected with the hand drill type power handle 3, and after the connection, the hand drill type power handle 3 can drive the sternum medullary cavity puncture needle 2 to rotate; the limiting clamp 1 can be clamped on the second end of the sternum medullary cavity puncture needle 2.

Specifically, the sternum medullary cavity puncture needle 2 comprises: a needle core member 21, a needle tube member 22, a holder 23, and a stopper 24; the first end of the needle core piece 21 is provided with a connecting piece, the second end is provided with an outer conical joint, and the center of the second end is provided with a needle core; needle tube member 22 comprises needle tube seat 221, clamping seat and needle tube 224; the needle tube seat 221 is provided with an inner conical joint, and the inner conical joint is matched with the outer conical joint; the needle core piece 21 and the needle cannula part 22 can be connected by an inner conical joint and an outer conical joint; the needle tube seat 221 is fixedly connected with the clamping seat, and a first thread 222 and a second thread 223 are arranged on the clamping seat; the needle tube member 22 is provided with a through hole, the needle tube 224 is arranged in the through hole of the needle tube member 22, the needle tube 224 is of a hollow needle structure, the needle core of the needle core member 21 can be inserted into the needle tube 224, and the needle direction of the needle tube 224 is the same as that of the clamping seat; the fixer 23 is provided with a through hole, a first internal thread is arranged in the through hole of the fixer 23, the first internal thread is matched with the first thread 222, and the fixer 23 can be fixed on the clamping seat; the stopper 24 is provided with a second internal thread interface at a first end, the second internal thread interface is matched with the second thread 223, the stopper 24 can be fixed on the clamping seat through the second internal thread interface, the stopper 24 is further provided with a through hole, and the needle tube 224 can be inserted into the through hole of the stopper 24. The outer cone connector is a 6% Ruhr outer cone connector with a locking connector; the inner conical joint is a 6% luer inner conical joint with a locking joint. The length of the needle core is greater than that of the needle tube; when the core member 21 is connected to the needle tube member 22, the needle tip of the core member can pass through the needle tube 224. When the needle core piece 21 is connected with the needle tube piece 22, the needle core is matched with the needle tube 224 to form a triangular needle.

Illustratively, as shown in FIG. 2, FIG. 2 is an assembled view of the needle 2. As shown in fig. 3, the sternal medullary cavity puncture needle 2 comprises: a needle core member 21, a needle cannula member 22, a retainer 23 and a stopper 24. As shown in fig. 4, the needle core member 21 is provided with a connecting member at a first end, an external conical joint at a second end, and a needle core at the center of the second end. As shown in fig. 5, needle cannula member 22 includes needle hub 221, a clamping seat, and needle cannula 224. The needle tube seat 221 is provided with an inner conical joint, the outer conical joint is matched with the inner conical joint, and the needle core member 21 and the needle tube member 22 can be connected through the outer conical joint and the inner conical joint. The utility model relates to a sternum medullary cavity injector, which uses a 6% luer conical joint with a locking joint. This connector is the most commonly used standard connector in medicine, and after the needle core member 21 is removed from the needle tube member 22, it can be connected to a 6% luer inner conical connector with a locking connector provided on the needle tube member 22 using a commonly used medical instrument such as a syringe. The needle tube seat 221 is fixedly connected with the clamping seat, and the clamping seat is provided with a first thread 222 and a second thread 223. The first thread 222 is of a larger cross-section than the second thread 223. It is also possible to use a design in which the first thread 222 and the second thread 223 have the same cross-section, but means for engaging the first thread 222 can be screwed onto the second thread 223; and a device that engages second thread 223 cannot be threaded onto first thread 222. The needle tube member 22 is provided with a through hole, the needle tube 224 is arranged in the through hole of the needle tube member 22, and the needle tube 224 is of a hollow needle structure. The utility model discloses a needle tube seat 221, needle tube have two kinds of design, one kind is needle tube seat 221, cassette and needle tube 224 integrated processing shaping, and another kind is needle tube seat 221 and cassette processing back, has set up the through-hole wherein, passes through means such as welding with needle tube 224 again and cassette fixed connection. The needle core of the needle core piece 21 can be inserted into the needle tube 224, and the needle direction of the needle tube 224 is the same as that of the clamping seat. The length of the needle core is greater than that of the needle tube; when the core member 21 is connected to the needle tube member 22, the needle tip of the core member can pass through the needle tube 224. When the core member 21 is connected to the needle cannula member 22, as shown in fig. 2, the core member cooperates with the needle cannula 224 to form a three-edged needle, which is a form of a puncture needle, and this cooperation is more advantageous for puncture. The fixer 23 is provided with a through hole, as shown in fig. 6, a first internal thread is provided in the through hole of the fixer 23, the first internal thread is matched with the first thread 222, and the fixer 23 can be fixed on the clamping seat. As shown in fig. 7, the stopper 24 is provided with a second internal thread interface at a first end, the second internal thread interface is matched with the second thread 223, the stopper 24 can be fixed to the holder through the second internal thread interface, the stopper 24 is further provided with a through hole, and the needle tube 224 can be inserted into the through hole of the stopper 24. The utility model discloses use two kinds of screw threads, stopper 24 twists behind certain department of cassette through second screw thread 223 like this, readjusts fixer 23, makes fixer 23 near stopper 24, and stopper 24 can not rotate backward after receiving pressure like this to the accurate position of stopper 24 has been guaranteed.

Specifically, the thickness of the limiting clamp 1 is 4-6 cm.

Illustratively, the present invention provides a thoracic cavity injector that uses a plurality of safety controls, one of which is a stop clip 1 to limit the depth of penetration. Before puncture, the limiting clamp 1 is clamped firstly, then the human body is punctured to the sternum, the limiting clamp 1 is tightly attached to the skin, then the limiting device 24 is adjusted to be tightly attached to the limiting clamp 1, and the limiting clamp 1 is taken down after adjustment, so that the puncture depth is just the thickness of the limiting clamp 1. Can get rid of like this the utility model discloses be applied to some people that the fatty layer is thicker, the not good problem of mastering of puncture degree of depth. The puncture depth, namely 4-6cm, can be determined by researching the thickness data of the anterior cortex of the medullary cavity of the human body in China. The thickness of the utility model enables the utility model to puncture the marrow cavity of the sternum without further puncturing the sternum. The utility model discloses can apply to other different crowds of country equally, the thickness of spacing clamp 1 should be along with the concrete data of cortex thickness before this national human bone marrow cavity and design.

Specifically, the hand drill type power handle 3 is provided with a power output port, the power output port is matched with the connecting piece, and the connecting piece can be inserted into the power output port; a power assembly is arranged in the hand drill type power handle 3 and can drive the connecting piece to rotate; the hand drill type power handle 3 further comprises a power switch, and the power switch is arranged on one side of the shell of the hand drill type power handle 3; the power switch is used for switching on/off the power assembly of the hand drill type power handle 3. The hand drill power handle 3 further comprises a control assembly capable of controlling the coupling rotational speed and/or torque. A pressure trigger starting assembly is also arranged in the hand drill type power handle 3; the pressure trigger starting assembly can receive the feedback pressure of the sternum medullary cavity puncture needle 2, and when the pressure is smaller than a first pressure value, the pressure trigger starting assembly can stop the power assembly; when the pressure is larger than or equal to the first pressure value, the pressure triggers the starting assembly to start the power assembly. After the power switch is turned on, the pressure trigger starting assembly only starts the power assembly once due to pressure trigger.

Illustratively, the hand drill type power handle 3 is provided with a power output port, the power output port is matched with the connecting piece, and the connecting piece can be inserted into the power output port; and a power assembly is arranged in the hand drill type power handle 3 and can drive the connecting piece to rotate. The hand drill type power handle 3 further comprises a power switch, and the power switch is arranged on one side of the shell of the hand drill type power handle 3; the power switch is used for switching on/off the power assembly of the hand drill type power handle 3. The hand drill type power handle 3 further comprises a control assembly, the control assembly can control the rotating speed and/or the torque of the connecting piece, and different bones can be drilled easily by adjusting the rotating speed and/or setting different torques. Preferably, the power switch is provided with an adjusting switch, and the rotating speed and/or the torque can be adjusted through the power switch. A pressure trigger starting assembly is also arranged in the hand drill type power handle 3; the pressure trigger starting assembly can receive the feedback pressure of the sternum medullary cavity puncture needle 2, and when the pressure is smaller than a first pressure value, the pressure trigger starting assembly can stop the power assembly; when the pressure is larger than or equal to the first pressure value, the pressure triggers the starting assembly to start the power assembly. The utility model relates to a breastbone marrow cavity injector, and the other case control means is a pressure trigger starting component. The method comprises the steps that a pressure starting threshold value, namely a first pressure value, is preset, when the received feedback pressure is larger than or equal to the first pressure value, the pressure triggering starting assembly starts a power assembly to provide power for the sternum medullary cavity puncture needle 2, and when the received feedback pressure is smaller than the first pressure value, the pressure triggering starting assembly stops the power assembly, and the power assembly does not provide power for the sternum medullary cavity puncture needle 2 any more. The sternum medullary cavity puncture needle 2 designed by the utility model punctures the muscle, when the sternum is not met, the received feedback pressure is smaller than the first pressure value, and the sternum medullary cavity puncture needle 2 does not rotate at the moment; when a sternum is met, the received feedback pressure is greater than the first pressure value, the power component provides power for the sternum medullary cavity puncture needle 2, and the sternum medullary cavity puncture needle 2 starts to rotate; when the sternum medullary cavity puncture needle 2 is drilled into the medullary cavity, the received feedback pressure is smaller than the first pressure value, and the sternum medullary cavity puncture needle 2 stops rotating at the moment. Because the power switch is turned on every time, the pressure trigger starting assembly can only start the power assembly once due to pressure trigger, and the bone wall on the other side of the sternum medullary cavity can not be drilled again even if the bone wall is drilled again, so that the safety of the whole sternum medullary cavity puncture can be ensured.

Specifically, the hand drill type power handle 3 further comprises a power interface, and the power interface is arranged on one side of the shell of the hand drill type power handle 3; the power interface is used for supplying power to the hand drill type power handle 3 after being connected with a power supply. The hand drill type power handle 3 further comprises a rechargeable battery, the rechargeable battery is arranged in the hand drill type power handle 3, and the rechargeable battery is used for supplying power to the hand drill type power handle 3; the power interface is also used for charging the rechargeable battery after being connected with a power supply.

Exemplarily, the syringe for the marrow cavity of the sternum designed by the utility model can be directly powered by connecting a power supply, and the hand drill type power handle 3 further comprises a power interface which is arranged on one side of the shell of the hand drill type power handle 3; the power interface is used for supplying power to the hand drill type power handle 3 after being connected with a power supply. A built-in rechargeable battery can be used for supplying power, the hand drill type power handle 3 further comprises a rechargeable battery, the rechargeable battery is arranged in the hand drill type power handle 3, and the rechargeable battery is used for supplying power to the hand drill type power handle 3; the power interface is also used for charging the rechargeable battery after being connected with a power supply.

The sternum is injected by using the sternum medullary cavity injector designed by the utility model, the following method can be adopted:

1. according to the crowds of different countries, selecting limiting clamps 1 with different thicknesses, and clamping the limiting clamps 1 on the sternum medullary cavity puncture needle 2;

2. the sternum medullary cavity injector is penetrated into a human body to push the human body to the sternum, the limiting clamp 1 is tightly attached to the skin, the limiting device 24 is adjusted to be tightly attached to the limiting clamp 1, the fixing device 23 is adjusted to be tightly attached to the limiting device 24, and the limiting clamp is taken down after adjustment, so that the puncture depth can be guaranteed to be just the thickness of the limiting clamp, and the problem that the puncture depth is not easy to master when the sternum medullary cavity injector is applied to people with thick fat layers can be solved;

3. turning on a power switch, pressing down the breastbone marrow cavity injector, triggering the starting component by pressure to start the power component, and rotating the breastbone marrow cavity puncture needle 2 to puncture towards the breastbone;

4. the sternum medullary cavity puncture needle 2 penetrates through the sternum to reach the medullary cavity, the pressure trigger starting component stops the power component, the sternum medullary cavity puncture needle 2 does not rotate any more, and due to the arrangement of the pressure trigger starting component, the sternum medullary cavity puncture needle 2 can not be drilled on the bone wall on the other side of the sternum to start the power component again;

5. the needle core member 21 was removed, and medical procedures such as injection were performed using a 6% luer taper joint of the needle tubing 22.

The utility model relates to a breastbone marrow cavity injector, simple structure, convenient operation, can safe and stable establish marrow cavity infusion passageway effectively, reduce patient's misery, improve first aid efficiency.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A sternal intramedullary canal injector, comprising: a limiting clamp (1), a sternum medullary cavity puncture needle (2) and a hand drill type power handle (3);

the first end of the sternum medullary cavity puncture needle (2) is connected with the hand drill type power handle (3), and after the connection, the hand drill type power handle (3) can drive the sternum medullary cavity puncture needle (2) to rotate;

the limiting clamp (1) can be clamped on the second end of the sternum medullary cavity puncture needle (2);

the sternum medullary cavity puncture needle (2) comprises: the needle core piece (21), the needle tube piece (22), the fixer (23) and the stopper (24);

the first end of the needle core piece (21) is provided with a connecting piece, the second end is provided with an outer conical joint, and the center of the second end is provided with a needle core;

the needle tube piece (22) comprises a needle tube seat (221), a clamping seat and a needle tube (224);

the needle tube seat (221) is provided with an inner conical joint, and the inner conical joint is matched with the outer conical joint; the needle core piece (21) and the needle tube piece (22) can be connected with the outer conical joint through the inner conical joint;

the needle tube seat (221) is fixedly connected with the clamping seat, and a first thread (222) and a second thread (223) are arranged on the clamping seat;

the needle tube component (22) is provided with a through hole, the needle tube (224) is arranged in the through hole of the needle tube component (22), the needle tube (224) is of a hollow needle-shaped structure, the needle core of the needle core component (21) can be inserted into the needle tube (224), and the needle head direction of the needle tube (224) is the same as the clamping seat direction;

the fixer (23) is provided with a through hole, a first internal thread is arranged in the through hole of the fixer (23), the first internal thread is matched with the first thread (222), and the fixer (23) can be fixed on the clamping seat;

the stopper (24) first end is provided with the second internal thread interface, the second internal thread interface with second screw thread (223) cooperation, stopper (24) can be fixed to through the second internal thread interface on the cassette, stopper (24) still are provided with and run through the through-hole, needle tubing (224) can be inserted stopper (24) runs through in the through-hole.

2. The sternal medullary cavity injector of claim 1,

the outer cone connector is a 6% Ruhr outer cone connector with a locking connector;

the inner conical joint is a 6% luer inner conical joint with a locking joint.

3. The sternal medullary cavity injector of claim 1,

the length of the needle core is greater than that of the needle tube;

after the needle core piece (21) is connected with the needle tube piece (22), the needle core needlepoint of the needle core piece (21) can penetrate out of the needle tube (224).

4. The sternal medullary cavity injector of claim 3,

when the needle core piece (21) is connected with the needle tube piece (22), the needle core is matched with the needle tube (224) to form a triangular needle.

5. The sternal medullary cavity injector of claim 1,

the hand drill type power handle (3) is provided with a power output port, the power output port is matched with the connecting piece, and the connecting piece can be inserted into the power output port;

a power assembly is arranged in the hand drill type power handle (3), and the power assembly can drive the connecting piece to rotate;

the hand drill type power handle (3) further comprises a power switch, and the power switch is arranged on one side of the shell of the hand drill type power handle (3); the power switch is used for switching on/off the power assembly of the hand drill type power handle (3).

6. The sternal medullary cavity injector of claim 5,

the hand drill power handle (3) further comprises a control assembly capable of controlling the coupling rotation speed and/or torque.

7. The sternal medullary cavity injector of claim 5 or 6,

a pressure trigger starting assembly is further arranged in the hand drill type power handle (3);

the pressure trigger starting component can receive the feedback pressure of the sternum medullary cavity puncture needle (2);

when the pressure is smaller than the first pressure value, the pressure trigger starting assembly can stop the power assembly;

when the pressure is larger than or equal to the first pressure value, the pressure triggers the starting assembly to start the power assembly.

8. The sternal medullary cavity injector of claim 7,

after the power switch is turned on, the pressure trigger starting assembly only starts the power assembly once due to pressure trigger.

9. The sternal medullary cavity injector of claim 8,

the hand drill type power handle (3) further comprises a power interface, and the power interface is arranged on one side of the shell of the hand drill type power handle (3);

the power interface is used for supplying power to the hand drill type power handle (3) after being connected with a power supply;

the hand drill type power handle (3) further comprises a rechargeable battery, the rechargeable battery is arranged in the hand drill type power handle (3), and the rechargeable battery is used for supplying power to the hand drill type power handle (3);

the power interface is also used for charging the rechargeable battery after being connected with a power supply.

10. The sternal medullary cavity injector of claim 1,

the thickness of the limiting clamp (1) is 4-6 cm.

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