WO2018209793A1 - Medical syringe with tool cavity - Google Patents

Abstract

A medical syringe (1) with a tool cavity, comprising an outer sleeve (2), a core rod (3), and an injection needle (4). One side of the core rod (3) is provided with a tool cavity (20) which is laterally opened and allows placement of the injection needle (4); a push flange (11) of the core rod (3) is provided with a notch (25) at the side of the tool cavity (20). Before use of the medical syringe (1), the injection needle (4) is placed into the tool cavity (20) of the core rod (3); during use of the medical syringe (1), a tapered lipping (22) of the syringe (1) placed into the tool cavity (20) of the core rod (3) is pinched at the notch (25) of the push flange (11) of the core rod (3) so that the injection needle (4) is taken out from the lateral opening of the tool cavity (20); after use of the medical syringe (1), the injection needle (4) inserted onto a conule (7) of the outer sleeve (2) is removed and placed into the tool cavity (20) of the core rod (3) from the lateral opening of the tool cavity (20), and then the core rod (3) is pushed to the bottom so that most of the core rod (3) enters into the outer sleeve (2), such that the purpose of a small overall size of the finally formed safe medical syringe is realized, and subsequent destruction processing can be conveniently performed.

Description

Medical syringe with instrument cavity Technical field

The present invention relates to various medical injectors, and more particularly to various disposable sterile syringes, and more particularly to various self-destructing single-use sterile syringes, and more particularly to various safe disposables. Bacterial syringes, and more particularly, are a variety of safe self-destructing single-use sterile syringes.

Background technique

Various medical injectors can be used to inject and output various liquids, as well as to pump various liquids. They can also be used to mix various liquids or mix various liquids with powders, and can also be used to pump in containers. Aspirating liquids, or mixing various liquids, or mixing liquids and powders, can also be used to rinse or clean objects. After inserting the injection needle into the cone of various medical syringes, various agents can be injected into the skin, muscles, blood vessels or other tissues and organs of the human or animal, and can also be sucked from the tissues and organs of the human body or animals. a liquid.

Conventional medical syringes are known to include a jacket and a core rod. The jacket has sufficient transparency. The jacket has a jacket cavity. The outer casing cavities are respectively open at the front and rear ends of the outer casing. The front end of the jacket cavity has a bottom. There is a cone at the front end of the bottom of the jacket cavity. The taper of the outer casing may be an outer conical joint or an outer conical locking joint. The taper of the outer sleeve can be a middle head taper or a head type taper head. There is a cone hole in the cone. The cone hole and the jacket cavity are penetrated. There is a jacket curl at the back of the jacket. There is a capacity scale on the outer surface of the jacket. The rear end of the core rod has a handle and a seal at the front. After the sealing ring of the core rod is inserted into the outer casing cavity from the rear end opening of the outer casing cavity, the handle of the mandrel can move the sealing ring back and forth in the outer casing cavity, and the outer wall of the sealing ring forms a medical condition with the inner wall of the outer casing cavity. Sealed fit of the syringe.

The first unsatisfactory result of a conventional medical syringe is that repeated use of a single-use sterile syringe can endanger the health of the human body after the use of a single-use sterile syringe. The sterile injection needle is exposed and is also very easy to be applied to the human body. Serious infection damage is caused, and because the needle and the cone of the syringe are tightly engaged, the action of removing the needle from the needle and closing the needle to close the needle is the most dangerous action for the medical staff to cause a needlestick injury. According to a study conducted by WHO in 2014 using the latest data, in 2010, as a result of unsafe injections, an estimated 1.7 million people were infected with hepatitis B virus, and as many as 315,000 people were infected with hepatitis C virus, up to 33,800. People are infected with HIV. The new injection safety guidelines and policies issued by WHO on February 23, 2015 provide detailed recommendations suggesting that new “smart” syringes for muscle or skin injections have the ability to prevent re-use and, in addition, by setting up safety in the syringe The device also prevents health workers from being stabbed by needles and causing infection. The second unsatisfactory is that the disposable sterile syringe and the sheathed injection needle are placed separately in the package; in use, the syringe needs to be removed from the package and then sheathed. The needle is taken out of the box, and then the needle is removed and the needle is mounted on the syringe; after use, the needle needs to be removed from the syringe, and then the sheath is sought to cover the needle, or directly The sheath covers the injection needle mounted on the syringe to prevent the naked injection needle from injuring the human body; the whole operation process is troublesome and it is easy to cause damage to the user.

Various safety type single-use sterile syringes described in U.S. Patent Nos. 2,020, 296, 277, A1, US Pat. No. 6,150, 174, 339 A1, US Pat. No. 20,150, 314, 079, A1, US Pat. The method takes the injectable needle into the cavity of the syringe to prevent serious injury caused by the injection of bacteria. The first unsatisfactory of the various medical syringes described above is that the parts of a safe disposable sterile syringe are more complex and more difficult to assemble than conventional disposable sterile syringes, so the cost of production is Much higher. The second unsatisfactory part of the above various medical syringes is that there are multiple parts in the liquid-filled chamber of the safe single-use sterile syringe, and it is difficult to completely eliminate the gas in the filling chamber of the syringe when filling the liquid. A gas plug is generated in the blood vessels of the human body, causing damage to the human body. A third unsatisfactory result of the above various medical syringes is that after the safe disposable single-use sterile syringe is used, most of the core rods are extended from the outer sleeve, and the overall volume after use is large, which brings about subsequent destruction treatment. trouble. The fourth unsatisfactory result of the above various medical syringes is that the safety type disposable sterile syringe has a clearance fit between the injection needle and the outer sleeve, and the injection needle of the disposable sterile syringe is inserted into the muscle of the human body. When the blood vessel is inside, the needle tip of the injection needle is easily oscillated, causing an operation error.

It can be clearly seen from the above that the known medical injector needs further improvement, so that the production cost of the medical syringe is lower, the medical syringe is safer and more convenient to use, and the medical syringe is more easily destroyed after use.

Summary of the invention

A first object of the present invention is to provide a medical syringe with an instrument cavity, wherein one side of the core rod has a laterally openable device cavity into which the injection needle can be placed, and the handle of the core rod is located on one side of the instrument cavity. There is a gap. Before the medical syringe is used, the injection needle is placed into the instrument cavity of the core rod; when the medical injector is used, the injection needle of the instrument chamber placed in the core rod is pinched at the hand-notch of the core rod. The tapered lip, the needle is taken out from the lateral opening of the instrument cavity; after the medical syringe is used, the injection needle inserted in the cone of the outer casing is removed, and then the needle is opened from the lateral opening of the instrument cavity Disposing into the instrument cavity of the core rod, and then pushing the core rod to the bottom, most of the core rods enter the outer casing, so as to achieve the purpose of the overall volume of the finally formed safety medical injector is small, thereby facilitating subsequent destruction processing.

A second object of the present invention is to provide a medical syringe with an instrument cavity, which realizes the interface of the injection needle by the tapered head and the tapered slope of the outer sleeve and the tapered lip and the tapered hole of the injector. When the hole is inserted into the cone of the outer sleeve, the injection needle is fixed on the cone of the outer sleeve, so as to prevent the needle tip of the injection needle from swinging when the injection needle is inserted into the muscle or blood vessel of the human body, thereby avoiding operation error. After the medical syringe is used, it is only necessary to pinch the conical lip of the injection needle away from the injection needle, and the injection needle can be separated from the cone of the outer casing of the medical syringe, and the injection needle can be placed in the collection box. The bacteria-injected needle can be collected into the instrument cavity of the core rod of the medical syringe to avoid the purpose of contacting the needle during the operation, thereby preventing the infected needle from injuring the human body.

A third object of the present invention is to provide a medical syringe with an instrument cavity, wherein the core rod has a laterally openable device cavity into which the injection needle can be placed, and the handle of the core rod is notched on one side of the instrument cavity. An axial injection needle guiding groove is formed on the same side of the outer wall of the outer casing and the appliance cavity of the core rod; the interface of the injection needle is formed by the tapered head and the tapered slope of the outer sleeve and the tapered lip and the tapered hole of the injection needle The rear portion of the outer casing cavity has a convex locking circumferential convex block, and the outer circumference of the core rod has a locking circumferential groove, and the rear end of the locking circumferential groove of the core rod has a circumferential protection convex piece, and the outer casing cavity The locking circumferential projection can be elastically deformed beyond the locking circumferential projection of the core rod into the locking circumferential groove of the core rod. Before the medical syringe is used, the injection needle is placed into the instrument cavity of the core rod; when the medical injector is used, the injection needle of the instrument chamber placed in the core rod is pinched at the hand-notch of the core rod. Conical lip, remove the needle from the lateral opening of the instrument cavity On the cone of the outer sleeve; after the medical syringe is used, pinch the conical lip of the injection needle away from the needle, the injection needle can be detached from the cone of the outer casing of the medical syringe, and the needle tip of the injection needle is guided along the injection needle Move until the infected injection needle enters the instrument cavity of the core rod from the lateral opening of the instrument cavity of the core rod to prevent the injection needle from stabbing the human body due to the needle tip swing before entering the instrument cavity of the core rod, and then the core After the rod is pushed to the bottom, most of the core rods enter the outer sleeve, and then the core rod is rotated so that the locking circumferential projections in the outer casing cavity are elastically deformed beyond the locking axial projections of the core rod into the locking circumferential grooves of the core rod. So that the injection needle in the appliance cavity of the core rod and the core rod is locked in the outer casing cavity, at this time, the circumferential protection protrusion covers the rear end of the locking circumferential projection in the outer casing cavity to prevent artificial The locking circumferential projections in the outer casing cavity that have entered the locking circumferential groove of the core rod are pulled away from the locking circumferential groove of the core rod. It not only achieves the purpose of not touching the needle during the operation, but also achieves the purpose of the overall size of the safe medical syringe which is finally formed, so as to avoid the serious injury caused by the injection of the bacteria and avoid being reused. It can also facilitate subsequent destruction processing.

A fourth object of the present invention is to provide a medical syringe with an instrument cavity, which realizes a convex positioning cam on the rear of the outer cavity of the outer casing, and the outer periphery of the core rod has positioning axial projections and along the core rod. A plurality of positioning circumferential grooves are arranged in an axial arrangement. When the core rod is rotated such that the positioning circumferential projections in the outer casing cavity are elastically deformed beyond the positioning axial projections of the core rod into the selected positioning circumferential grooves of the core rod, the core rods constrained in the outer casing cavity The chamber between the sealing ring and the bottom of the outer casing cavity forms a selected liquid filling capacity of the medical injector; when the core rod is rotated, the positioning circumferential projection in the outer casing cavity is elastically deformed over the positioning circumferential groove of the core rod After the positioning of the circumferential groove of the core rod is removed, the manipulation of the mandrel can cause the sealing ring to move back and forth in the casing cavity; the liquid filling amount of the medical injector can be accurately locked.

A fifth object of the present invention is to provide a medical syringe with an instrument cavity that achieves one less piece of a safe disposable sterile syringe or a safe self-destructing single-use sterile syringe than a conventional disposable sterile syringe. The structure of the sheath of the injection needle, the structure of the filling chamber of the medical injector of the present invention is the same as that of the conventional single-use sterile syringe, and the medical injector of the invention not only facilitates the elimination of gas in the filling chamber and facilitates assembly. The goal, however, is to achieve a production cost that is similar to the cost of a conventional single-use sterile syringe and is much less expensive than the existing safe disposable single-use sterile syringe or safe self-destructing single-use sterile syringe. purpose.

The object of the invention is achieved by the following technical solutions:

The medical injector of the present invention includes a jacket, a core rod and an injection needle. The jacket has sufficient transparency. The jacket has a jacket cavity. The outer casing cavities are respectively open at the front and rear ends of the outer casing. The front end of the jacket cavity has a bottom. There is a cone at the front end of the bottom of the jacket cavity. An injection needle can be inserted into the cone of the jacket. The taper of the outer casing may be an outer conical joint or an outer conical locking joint, which may be a middle-headed cone or a partial-headed cone. There is a cone hole in the cone. The cone hole and the jacket cavity are penetrated. There is a jacket curl at the back of the jacket. There is a capacity scale on the outer surface of the jacket. The rear end of the core rod has a handle and a seal at the front. The sealing ring can be made integral with the core rod or can be made in a split type with the core rod. After the sealing ring of the core rod is inserted into the outer casing cavity from the rear end opening of the outer casing cavity, the handle of the mandrel can move the sealing ring back and forth in the outer casing cavity, and the outer wall of the sealing ring forms a medical condition with the inner wall of the outer casing cavity. Sealed fit of the syringe.

The core of the medical injector of the present invention has a laterally open instrument lumen. An axial needle guide groove is provided on the same side of the outer wall of the outer casing and the appliance cavity of the core rod. There may be axial ribs on both sides of the injection needle guiding groove. The ribs on either side of the injection needle guiding groove may be located on the front side of the outer casing of the outer casing. The ribs on both sides of the injection needle guiding groove and the outer wall of the outer casing Injection needle guide groove. After the injection needle inserted on the cone of the outer sleeve is removed, the needle tip of the injection needle is moved backward along the injection needle guiding groove, and the ribs on both sides of the injection needle guiding groove prevent the needle tip of the injection needle from being guided along the injection needle guiding groove When moving backwards, the injection needle guiding groove is slid until the injection needle enters the instrument cavity of the core rod from the lateral opening of the instrument cavity of the core rod.

The rear portion of the injection needle guiding groove can penetrate the wall of the rear side of the outer casing of the outer casing to form a slit. After the injection needle inserted on the cone of the outer sleeve is removed, the needle tip of the injection needle is moved backward along the injection needle guiding groove to the gap of the rear portion of the injection needle guiding groove, so that the injection needle is from the instrument chamber of the core rod The lateral opening enters the instrument cavity of the core rod.

The rear end of the cone of the outer casing of the medical injector of the present invention may have a tapered bevel. The back of the needle can have a tapered lip and a tapered hole. The tapered lip of the needle is located at the back of the tapered bore. The rear end of the instrument chamber of the core rod may have a circumferential inner groove. The circumferential width at the lateral opening of the intracavity circumferential groove of the instrument lumen of the mandrel is less than the diameter of the conical lip of the injection needle and the diameter of the circumferential groove in the lumen of the instrument lumen. When the injection needle is placed into the instrument cavity of the core rod, the tapered lip of the injection needle elastically deforms beyond the lateral opening of the circumferential groove of the cavity of the instrument cavity into the circumferential groove of the cavity of the instrument cavity, so that the injection needle The tapered lip is constrained within the circumferential groove of the lumen of the instrument cavity to constrain the needle within the lumen of the instrument. When the tapered hole of the injection needle is inserted into the cone of the outer casing, the injection needle is fixed to the cone of the outer casing. When the tapered lip of the injection needle is pinched, the tapered lip moves along the conical slope of the rear end of the cone of the outer sleeve, so that the tapered lip pushes the injection needle forward, so that the tapered hole of the injection needle is separated from the cone of the outer sleeve head.

One side of the mandrel of the medical injector of the present invention may have a laterally open instrument lumen. An injection needle can be placed in the instrument cavity. The rear end of the instrument cavity has an intracavity circumferential groove. The circumferential width at the lateral opening of the circumferential groove of the lumen of the instrument cavity is less than the diameter of the tapered lip of the injection needle and the diameter of the circumferential groove in the lumen of the instrument lumen. The handle of the core rod may have a notch on one side of the appliance cavity. When the injection needle is placed into the instrument cavity of the core rod, the tapered lip of the injection needle elastically deforms beyond the lateral opening of the circumferential groove of the cavity of the instrument cavity into the circumferential groove of the cavity of the instrument cavity, so that the injection needle The tapered lip is constrained within the circumferential groove of the lumen of the instrument cavity to constrain the needle within the lumen of the instrument. The injection needle is placed into the instrument cavity of the mandrel before the medical syringe is used. When the medical syringe is used, the conical lip of the injection needle placed in the instrument chamber of the core rod is pinched at the hand-notch of the core rod, and the injection needle is taken out from the lateral opening of the instrument chamber, and then the needle is removed. The tapered hole of the injection needle is inserted into the cone of the outer sleeve so that the injection needle is fixed to the cone of the outer sleeve. After the medical syringe is used, the injection needle inserted into the cone of the outer casing is removed, and the injection needle is then placed into the instrument cavity of the core rod from the lateral opening of the instrument cavity.

The rear portion of the outer casing cavity of the medical injector of the present invention may have a convex locking circumferential projection. The axial direction of the locking circumferential projection has a convex axially constrained inclined surface. The circumferential sides of the locking circumferential protrusion respectively have a convex circumferentially constrained inclined surface. The outer circumference of the core rod may have a locking circumferential groove. The axial direction of the locking circumferential groove has a groove axially constraining the inclined surface. The circumferential sides of the locking circumferential groove respectively have a groove circumferentially constraining slope. The circumferential side of the locking circumferential groove has a locking axial projection. When the core rod is rotated such that the locking circumferential projections in the outer casing cavity are elastically deformed beyond the locking axial projections of the core rod into the locking circumferential grooves of the core rod, the groove shaft of the core rod locking the circumferential groove The two axially constrained inclined slopes of the locking circumferential groove of the core rod are respectively restrained from the axially constraining inclined surface of the locking circumferential groove and the locking circumferential convexity in the outer casing cavity respectively The two lug circumferentially constraining ramps of the circumferential projections are constrained to each other such that the core rod is locked to the outer casing cavity.

The rear portion of the outer casing cavity has a convex locking circumferential projection. The outer circumference of the core rod has a locking circumferential groove. The rear end of the locking circumferential groove of the core rod has a circumferential protection projection. When the locking circumferential projections in the outer casing cavity enter the locking circumferential groove of the core rod Thereafter, the circumferential protection projection covers the rear end of the locking circumferential projection in the outer casing cavity to prevent the locking circumferential projections from being inside the outer casing cavity of the locking core groove that has entered the core rod. Pull the locking circumferential groove away from the core rod.

The rear portion of the outer casing cavity of the medical injector of the present invention may have a convex locking circumferential projection. The outer circumference of the core rod may have a locking circumferential groove. The rear end of the locking circumferential groove of the core rod has a circumferential protection projection. The circumferential protective projection covers the rear end of the locking circumferential projection in the outer casing cavity when the locking circumferential projection in the outer casing cavity enters the locking circumferential groove of the core rod.

The rear portion of the outer casing cavity of the medical injector of the present invention may have a convexly positioned circumferential projection. The axial sides of the positioning circumferential protrusion respectively have a convex axially constraining inclined surface. The circumferential circumferential sides of the positioning circumferential protrusion respectively have a convex circumferentially constrained inclined surface. The outer circumference of the core rod may have a positioning circumferential groove. A plurality of positioning circumferential grooves are arranged along the axial direction of the core rod. Each of the axially opposite sides of each of the positioning circumferential grooves has a groove axially constraining slope. Each of the circumferential sides of each of the positioning circumferential grooves has a groove circumferentially constraining slope. The circumferential side of the positioning circumferential groove has a positioning axial projection. The circumferential side of the positioning axial projection has a convex circumferential constraint slope. When the core rod is rotated such that the positioning circumferential projections in the outer casing cavity are elastically deformed beyond the positioning of the axial projections of the axial projections of the axial projections into the selected circumferential grooves of the core rod, the core rod The two groove circumferentially constraining slopes of the selected positioning circumferential groove respectively constrain the two convex circumferentially constraining slopes of the positioning circumferential protrusions in the outer casing cavity, hindering the rotation of the core rod in the outer casing cavity, The two groove axially constraining slopes of the selected positioning circumferential groove of the core rod respectively constrain the two axially constraining slopes of the positioning circumferential projections in the outer casing cavity, obstructing the sealing ring of the core rod Moving back and forth within the outer casing cavity, the chamber between the front end of the sealing ring of the mandrel constrained within the outer casing cavity and the bottom of the outer casing cavity forms a selected liquid filling capacity of the medical injector. When the core rod is rotated, the positioning circumferential projection in the outer casing cavity is elastically deformed, and the groove of the positioning circumferential groove of the core rod is moved over the circumferentially constraining inclined surface of the core rod to remove the positioning circumferential groove of the core rod, and the positioning of the axial rod of the core rod is convex. The circumferentially constrained bevel prevents the positioning circumferential projections in the outer casing cavity from entering the positioning circumferential groove of the core rod, and the manipulation of the mandrel allows the sealing ring to move back and forth within the outer casing cavity.

DRAWINGS

Figure 1 is a front elevational view showing the safety self-destructing medical syringe of the first embodiment of the present invention before use;

Figure 2 is a front elevational view showing the medical injector of Figure 1 when it is to be removed or has been placed into the needle;

Figure 3 is a front elevational view showing the medical injector of Figure 1 when in use;

Figure 4 is a perspective view showing the movement of the needle tip of the injection needle of Figure 1 along the injection needle guiding groove after use of the medical injector of Figure 1;

Figure 5 is a rear elevational view showing the medical injector of Figure 1 in a self-locking state;

Figure 6 is a cross-sectional view taken along line 6-6 of Figure 5;

Figure 7 is a sectional view taken along line 7-7 of Figure 5;

Figure 8 is a partial enlarged view showing the R region of Figure 6;

Figure 9 is a partial enlarged view showing a P area of Figure 7;

Figure 10 is a perspective view showing Figure 5;

Figure 11 is an external view showing the outer casing of the medical injector of Figure 1;

Figure 12 is an external view showing the injection needle placed in the core rod;

Figure 13 is a perspective view showing a core of the medical injector of Figure 1;

Figure 14 is an external view showing the back surface of Figure 13;

Figure 15 is a perspective view showing an injection needle of the medical injector of Figure 1;

Figure 16 is an external view showing the mandrel of the medical injector of Figure 1 replaced with a C-shaped hand-cranked mandrel;

Figure 17 is a view showing the direction of the circumferential direction of the positioning of the core rod of the safety self-destructing medical syringe according to the second embodiment of the present invention;

Figure 18 is a cross-sectional view taken along line 18-18 of Figure 17;

Figure 19 is a cross-sectional view taken along line 19-19 of Figure 17;

Figure 20 is a partial enlarged view showing the U area of Figure 18;

Figure 21 is a partial enlarged view showing a V area of Figure 19;

Figure 22 is a perspective view showing the medical injector of Figure 17;

Figure 23 is a front elevational view showing the medical syringe of Figure 17 when it is to be removed or has been placed;

Figure 24 is a front elevational view showing the medical injector of Figure 17 when in use;

Figure 25 is a perspective view showing the movement of the needle tip of the injection needle of Figure 17 along the injection needle guide groove after use;

Figure 26 is a perspective view showing the core of the medical injector of Figure 17 pushed to the end;

Figure 27 is a rear elevational view showing the medical injector of Figure 17 in a self-locking state;

Figure 28 is a cross-sectional view taken along line 28-28 of Figure 27;

Figure 29 is a cross-sectional view taken along line 29-29 of Figure 27;

Figure 30 is a perspective view showing the outer casing of the medical injector of Figure 17;

Figure 31 is a perspective view showing the back surface of Figure 30;

Figure 32 is a front elevational view showing the core of the medical injector of Figure 17;

Figure 33 is a front elevational view showing the injection needle of the medical injector of Figure 17 placed in the mandrel;

Fig. 34 is a perspective view showing the mandrel of the medical injector of Fig. 17 replaced with a mandrel with a C-shaped hand.

detailed description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the medical syringe with an instrument chamber of the present invention will be described with reference to the accompanying drawings. The scope of the invention is pointed out in the claims. It will be appreciated that some or all of the figures are for illustrative purposes of the preferred embodiments of the invention and are not to The practical manner of achieving the above and other objects and advantages of the present invention will become more apparent from the detailed description of the preferred embodiments.

In the drawings and the following description, the terms "near" and "rear" refer to the position near the injector operator, while the terms "far" and "front" refer to the position away from the injector operator. The term "axial" is based on the long axis direction of the outer casing of the medical injector, and the term "circumferential" is based on the circumferential direction of the radial section of the outer casing of the medical injector. The terms of position and orientation may be further understood from the drawings and the description below.

1 to 15 show a safe self-destructing medical injector 1 according to a first embodiment of the present invention. The medical injector 1 includes a jacket 2, a core rod 3, and an injection needle 4. The outer casing 2 (see Figs. 1, 6, and 11) has a jacket cavity 5. The outer casing cavity 5 is at the rear end opening 6 of the outer casing 2. The front end of the outer casing cavity 5 has a bottom portion 7. At the front end of the bottom 7 of the jacket cavity 5 There is a cone 8 . The cone head 8 has a cone hole 9 therein. The taper hole 9 and the outer casing cavity 5 penetrate to form a front end opening of the outer casing 2. At the rear of the outer casing 2 there is a jacket bead 10. There is a capacity scale 11 on the outer surface of the outer casing 2. The rear end of the core rod 3 (see Figs. 6, 13, and 14) has a handle 12 and a seal ring 13 at the front. After the sealing ring 13 of the core rod 3 is inserted into the outer casing cavity 5 from the rear end opening 6 of the outer casing cavity 5, the pressing of the hand 12 of the mandrel 3 causes the sealing ring 13 to move back and forth within the outer casing cavity 5, and the sealing ring 13 The outer wall 14 forms an sealing fit with the inner wall 15 of the outer casing cavity 5 to form the medical injector 1.

One side of the rear portion of the outer wall of the outer casing 2 has an axial needle guiding groove 16 (see Figs. 4 and 11). The injection needle guiding groove 16 has axial ribs 17 on both sides. The front portion of the rib 17 on both sides of the injection needle guiding groove 16 on the front side of the outer casing bead 10 of the outer casing 2 and the outer wall of the outer casing 2 constitute the front portion 18 of the injection needle guiding groove 16. The rear portion 19 of the injection needle guiding groove 16 on the rear side of the outer casing bead 10 of the outer casing 2 penetrates the wall of the rear side of the outer casing bead 10 of the outer casing 2 to form a slit. The core rod 3 has a laterally open instrument chamber 20 on the same side of the needle guiding groove 16. When the injection needle 4 inserted in the conical head 8 of the outer casing 2 is removed, the needle tip of the injection needle 4 is moved rearward along the injection needle guiding groove 16 to the slit at the rear of the injection needle guiding groove 16, and the injection needle is guided. The ribs 17 on both sides of the groove 16 prevent the needle tip of the injection needle 4 from sliding out of the injection needle guiding groove 16 as it moves rearward along the injection needle guiding groove 16 until the injection needle 4 is from the lateral opening of the instrument chamber 20 of the core rod 3. Entering the appliance cavity 20 of the core rod 3.

The rear end of the cone 8 of the outer sleeve 2 has a conical bevel 21 (see Fig. 6). The rear portion of the injection needle 4 has a tapered lip 22 and a tapered hole 23 (see Fig. 15). The tapered lip 22 of the injection needle 4 is located at the rear of the tapered hole 23. The rear end of the instrument chamber 20 of the core rod 3 has an intracavity circumferential groove 24 (see Figs. 6 and 13). The circumferential width at the lateral opening of the intracavity circumferential groove 24 of the instrument chamber 20 of the core rod 3 is smaller than the diameter of the tapered lip 22 of the injection needle 4 and the diameter of the intraluminal circumferential groove 24 of the instrument chamber 20. When the injection needle 4 is placed into the instrument chamber 20 of the core rod 3 (see Fig. 12), the tapered lip 22 of the injection needle 4 is elastically deformed over the lateral opening of the inner circumferential groove 24 of the instrument chamber 20 into The intraluminal circumferential groove 24 of the instrument lumen 20 is such that the tapered lip 22 of the injection needle 4 is constrained within the intraluminal circumferential groove 24 of the instrument lumen 20, constraining the injection needle 4 within the instrument lumen 20. When the tapered hole 23 of the injection needle 4 is inserted into the conical head 8 of the outer casing 2 (see Fig. 3), the injection needle 4 is fixed to the conical head 8 of the outer casing 2. When the tapered lip 22 of the injection needle 4 is pinched, the tapered lip 22 moves along the conical bevel 21 of the rear end of the cone 8 of the outer sleeve 2, so that the conical lip 22 pushes the injection needle 4 forward to make an injection The tapered hole 23 of the needle 4 is disengaged from the taper 8 of the outer casing 2.

The handle 12 of the core rod 3 has a notch 25 on the side of the appliance cavity (see Figure 13). Before the medical injector 1 is used, the injection needle 4 is placed into the instrument chamber 20 of the core rod 3 (see Fig. 2). When the medical syringe 1 is used, the tapered lip 22 of the injection needle 4 placed in the instrument chamber 20 of the core rod 3 is pinched at the notch 25 of the handle 3 of the core rod 3, from the side of the instrument chamber 20 The injection needle 4 is taken out from the opening, and the tapered hole 23 of the injection needle 4 is inserted into the conical head 8 of the outer casing 2 so that the injection needle 4 is fixed to the conical head 8 of the outer casing 2.

The rear portion of the outer casing cavity 5 has a convex locking circumferential projection 26 (see Figs. 5 to 9 and Fig. 11). The axial direction of the locking circumferential projection 26 has a large angled projection axially constraining slope 27. The circumferential sides of the locking circumferential projection 26 have large angled lug circumferentially constraining slopes 28 and 29, respectively. The outer circumference of the core rod 3 has a locking circumferential groove 30 (see Figs. 5 to 9 and Fig. 14). The axial direction of the locking circumferential groove 30 has a large angled groove axially constraining slope 31. The circumferential sides of the locking circumferential groove 30 have large inclined groove circumferentially constraining slopes 32 and 33, respectively. The circumferential side of the locking circumferential groove 30 has a locking axial projection 34. When the medical injector 1 is used, the locking axial projections 34 of the core rod 3 prevent the locking circumferential projections 26 in the outer casing cavity 5 The locking axial projection 34 over the core rod 3 enters the locking circumferential groove 30 of the core rod 3. After the medical syringe 1 is used, after the injection needle 4 inserted in the cone 8 of the outer sleeve 2 is removed, the injection needle 4 is placed in the instrument chamber 20 of the core rod 3 (see Fig. 2), and then the core rod The sealing ring 13 of 3 is pushed to the bottom 7 of the outer casing 2 (see Fig. 1), and then the core rod 3 is rotated such that the locking circumferential projection 26 in the outer casing cavity 5 is elastically deformed over the locking shaft of the core rod 3. Entering the projection 34 into the locking circumferential groove 30 of the core rod 3, the large angled groove of the locking circumferential groove 30 of the core rod 3 axially constrains the inclined surface 31 and the locking circumferential projection 26 in the outer casing cavity 5 The large-inclination lug axially constraining bevels 27 are mutually constrained to prevent the mandrel 3 from moving back and forth within the outer casing cavity 5, and the two large dip grooves of the mandrel 3 of the locking circumferential groove 30 are circumferentially constrained by the inclined faces 32 and 33, respectively The two large angled lug circumferentially constraining ramps 28 and 29 of the locking circumferential lug 26 in the outer casing cavity 5 are mutually constrained to prevent the core rod 3 from rotating within the outer casing cavity 5 (see Figures 5 to 9). At the same time, the sound emitted by the locking circumferential projection 26 in the outer casing cavity 5 is elastically deformed, and the core rod 3 and the injection needle 4 placed in the instrument chamber 20 of the core rod 3 have been locked in the outer casing 2. Inside( FIG 10).

The rear end of the locking circumferential groove 30 of the core rod 3 has a circumferential protection projection 35 (see Fig. 4). When the core rod 3 is rotated such that the locking circumferential projection 26 in the outer casing cavity 5 is elastically deformed beyond the locking axial projection 34 of the core rod 3 into the locking circumferential groove 30 of the core rod 3, the circumferential protection convex The block 35 covers the rear end of the locking circumferential projection 26 in the outer casing cavity 5 (see Figs. 8 and 10) to prevent the outer casing cavity 5 from being inserted into the locking circumferential groove 30 of the core rod 3. The inner locking circumferential projection 26 is pulled away from the locking circumferential groove 30 of the core rod 3.

The core rod 3 in the medical injector 1 can also be replaced with a core rod 37 (see Fig. 16) with a C-shaped handle 36. The C-shaped hand 37 of the core rod 37 cooperates with the outer casing bead 10 of the outer sleeve 2 to facilitate one-handed operation.

17 to 33 are diagrams showing a self-destructing medical syringe 40 of a prefilled liquid according to a second embodiment of the present invention. The medical injector 40 includes a jacket 41, a core rod 42 and an injection needle 4. The outer casing 41 (see Figs. 28, 30 and 31) has a jacket cavity 43. The outer casing cavity 43 is at the rear end opening 44 of the outer casing 41. The front end of the outer casing cavity 43 has a bottom portion 45. A tapered head 46 is provided at the front end of the sealing bottom 45 of the outer casing cavity 43. The cone head 46 has a cone hole 47 therein. The taper hole 47 and the outer casing cavity 43 penetrate to form a front end opening of the outer casing 41. At the rear of the outer casing 41 there is a jacket bead 48. There is a capacity scale 49 on the outer surface of the outer casing 41. The rear end of the core rod 42 (see Figs. 17, 18, 28 and 32) has a handle 50 and a seal ring 51 at the front. After the sealing ring 51 of the core rod 42 is inserted into the outer casing cavity 43 from the rear end opening 44 of the outer casing cavity 43, the pressing of the hand 50 of the mandrel 42 causes the sealing ring 51 to move back and forth within the outer casing cavity 43, the sealing ring 51 The outer wall 52 and the inner wall 53 of the outer casing cavity 43 form a sealing fit for the medical injector 40.

One side of the rear portion of the outer wall of the outer casing 41 has an axial needle guiding groove 54 (see Figs. 25 and 30). The injection needle guiding groove 54 has axial ribs 55 on both sides. The front portion of the rib 55 on both sides of the injection needle guiding groove 54 on the front side of the outer casing bead 48 of the outer casing 41 and the outer wall of the outer casing 41 constitute the front portion 56 of the injection needle guiding groove 54. The rear portion 57 of the injection needle guiding groove 54 on the rear side of the outer casing bead 48 of the outer casing 41 penetrates the wall of the rear side of the outer casing bead 48 of the outer casing 41 to form a slit. The core 42 has a laterally open instrument cavity 58 on the same side of the needle guiding groove 54. When the injection needle 4 inserted in the cone 46 of the outer casing 41 is removed, the needle tip of the injection needle 4 is moved rearward along the injection needle guiding groove 54 to the slit at the rear of the injection needle guiding groove 54, and the needle is guided. The ribs 55 on either side of the slot 54 prevent the needle tip of the injection needle 4 from sliding out of the needle guiding groove 54 as it moves rearwardly along the needle guiding groove 54 until the needle 4 is from the lateral opening of the instrument chamber 58 of the core rod 42 Entering the instrument cavity 58 of the core rod 42.

The rear end of the cone 46 of the outer casing 41 has a conical bevel 59 (see Fig. 23). The rear end of the instrument cavity 58 of the core rod 42 has an intracavity circumferential groove 60 (see Figs. 25 and 32). The circumferential width at the lateral opening of the intracavity circumferential groove 60 of the instrument cavity 58 of the core rod 42 is less than the diameter of the tapered lip 22 of the injection needle 4 and the diameter of the intraluminal circumferential groove 60 of the instrument cavity 58. When the injection needle 4 is placed into the instrument cavity 58 of the mandrel 42 (see Fig. 33), the tapered lip 22 of the injection needle 4 is elastically deformed past the lateral opening of the circumferential groove 60 of the lumen of the instrument cavity 58 into The intraluminal circumferential groove 60 of the instrument cavity 58 is such that the tapered lip 22 of the injection needle 4 is constrained within the intraluminal circumferential groove 60 of the instrument cavity 58 to constrain the injection needle 4 within the instrument cavity 58. When the tapered hole 23 of the injection needle 4 is inserted into the tapered head 46 of the outer casing 41 (see Fig. 24), the injection needle 4 is fixed to the tapered head 46 of the outer casing 41. When the tapered lip 22 of the injection needle 4 is pinched, the tapered lip 22 moves along the conical bevel 59 at the rear end of the cone 46 of the outer casing 41, so that the tapered lip 22 pushes the injection needle 4 forward to make an injection The tapered bore 23 of the needle 4 is disengaged from the cone 46 of the outer casing 41.

The handle 50 of the core 42 has a notch 61 (see Fig. 22) on one side of the instrument cavity. The injection needle 4 is placed into the instrument cavity 58 of the mandrel 42 before the medical injector 40 is used. When the medical injector 40 is used, the tapered lip 22 of the injection needle 4 placed in the instrument chamber 58 of the core rod 42 is gripped at the notch 61 of the handle 50 of the core rod 42 from the side of the instrument chamber 58. The injection needle 4 is taken out from the opening, and the tapered hole 23 of the injection needle 4 is inserted into the cone 46 of the outer casing 41 so that the injection needle 4 is fixed to the cone 46 of the outer casing 41 (see Fig. 24).

The rear portion of the outer casing cavity 43 has a convex locking circumferential projection 62 (see Figs. 27-29 and 30). The axial direction of the locking circumferential projection 62 has a large angled projection axially constraining slope 63. The circumferential sides of the locking circumferential projection 62 have large angled lug circumferentially constraining slopes 64 and 65, respectively. The outer circumference of the core rod 42 has a locking circumferential groove 66 (see Figs. 27 to 29). The axial direction of the locking circumferential groove 66 has a large angled groove axially constraining slope 67. The circumferential sides of the locking circumferential groove 66 have large angled groove circumferentially constraining slopes 68 and 69, respectively. The circumferential side of the locking circumferential groove 66 has a locking axial projection 70. When the medical injector 40 is in use, the locking axial projection 70 of the core rod 42 prevents the locking circumferential projection 62 in the outer casing cavity 43 from entering the core rod 42 over the locking axial projection 70 of the core rod 42. The locking circumferential groove 66 is locked. After the medical syringe 40 is used, the injection needle 4 inserted in the cone 46 of the outer casing 41 is removed, the injection needle 4 is placed in the instrument cavity 58 of the core rod 42, and the sealing ring 51 of the core rod 42 is placed. Pushing to the bottom 45 of the outer casing 41, then rotating the core rod 42 causes the locking circumferential projection 62 in the outer casing cavity 43 to elastically deform over the locking axial projection 70 of the core rod 42 into the lock of the core rod 42 In the tight circumferential groove 66, the large angled groove of the locking circumferential groove 66 of the core rod 42 axially constrains the inclined surface 67 and the large angled projection axially inclined slope 63 of the locking circumferential projection 62 in the outer casing cavity 43. Constrained to prevent the core rod 42 from moving back and forth within the outer casing cavity 43, the two large angled groove circumferentially constraining slopes 68 and 69 of the locking circumferential groove 66 of the core rod 42 and the locking circumference in the outer casing cavity 43, respectively. The two large angled lug circumferentially constraining ramps 64 and 65 of the projection 62 are mutually constrained to prevent the core rod 42 from rotating within the outer casing cavity 43; at the same time, the locking circumferential projection 62 in the outer casing cavity 43 is elastic The sound emitted during the deformation indicates that the core rod 42 and the injection needle 4 inserted into the instrument chamber 58 of the core rod 42 have been locked in the outer casing 41 (see Fig. 27 to 29).

The rear end of the locking circumferential groove 66 of the core rod 42 has a circumferential protection projection 71 (see Figs. 27 to 29). When the core rod 42 is rotated such that the locking circumferential projection 62 in the outer casing cavity 43 is elastically deformed beyond the locking axial projection 70 of the core rod 42 into the locking circumferential groove 66 of the core rod 42, the circumferential protection convex The block 71 covers the rear end of the locking circumferential projection 62 in the outer casing cavity 43 to prevent the locking circumference in the outer casing cavity 43 in the locking circumferential groove 66 that has entered the core rod 42. The locking circumferential groove 66 of the core rod 42 is pulled away from the projection 62.

The rear portion of the outer casing cavity 43 has a convexly located circumferential projection 72 (see Figs. 17-21 and 31). The axially opposite sides of the positioning circumferential projection 72 have convex axially constraining inclined surfaces 73 and 74, respectively. The circumferential sides of the circumferential projection 72 are respectively convexly constrained inclined surfaces 75 and 76. The outer circumference of the core rod 42 has a positioning circumferential groove 77 (see Figs. 17 to 24). A plurality of positioning circumferential grooves 77 are arranged in the axial direction of the core rod 42. The axially opposite sides of each of the positioning circumferential grooves 77 respectively have groove axially constraining slopes 78 and 79. The circumferential circumferential sides of each of the positioning circumferential grooves 77 respectively have groove circumferentially constraining slopes 80 and 81. The circumferential side of the positioning circumferential groove 77 has a positioning axial projection 82. The circumferential side of the positioning axial projection 82 has a lug circumferentially constraining slope 83. When the mandrel 42 is rotated, the positioning circumferential projection 72 in the outer casing cavity 43 is elastically deformed over the positioning of the axial projection 42 of the core rod 42. The circumferentially constraining slope 83 enters the selected positioning circumferential concave of the core 42. After the groove 84, the two groove circumferentially constraining slopes 85 and 86 of the selected positioning circumferential groove 84 of the core rod 42 and the two lug circumferential directions of the positioning circumferential projection 72 in the outer casing cavity 43, respectively. The constraining ramps 75 and 76 are mutually constrained to prevent the core rod 42 from rotating within the outer casing cavity 43. The two recesses of the selected positioning circumferential groove 84 of the core rod 42 axially constrain the ramps 87 and 88, respectively, with the outer casing cavity 43. The two bump axially constraining ramps 73 and 74 of the inner circumferential lug 72 are constrained to each other, hindering the seal ring 51 of the core rod 42 from moving back and forth within the outer casing cavity 43 and being constrained within the outer casing cavity 43 The chamber between the front end of the seal ring 51 of the rod 42 and the bottom portion 45 of the outer casing cavity 43 forms a selected liquid filling capacity of the medical injector 40 (see Figures 17-22). When the mandrel 42 is rotated such that the positioning circumferential projection 72 in the outer casing cavity 43 is elastically deformed over the groove of the selected positioning circumferential groove 84 of the core rod 42, the circumferentially constraining bevel 85 moves out of the selected one of the core rod 42. After positioning the circumferential groove 84, the cam circumferentially constraining bevel 83 of the positioning axial projection 82 of the core rod 42 blocks the positioning circumferential projection 72 in the outer casing cavity 43 from entering the positioning circumferential groove 77 of the core rod 42. The push of the hand 42 of the lever 42 causes the seal ring 51 to move back and forth within the outer casing cavity 43 (see Figures 23 to 26). During operation, the audible sound produced by the positioning of the circumferential projections 72 within the outer casing cavity 43 indicates that the operational state of the medical injector 40 has been altered.

The mandrel 42 in the medical injector 40 can also be replaced with a mandrel 90 with a C-shaped hand 89 (see Figure 34). The C-shaped hand 89 of the core rod 90 cooperates with the outer casing bead 48 of the outer sleeve 41 to facilitate one-handed operation.

According to the above detailed description, the medical syringe with the instrument cavity of the present invention can achieve the following technical effects:

The medical syringe with the instrument cavity of the present invention realizes a laterally openable device cavity into which the injection needle can be placed on one side of the core rod, and the handle of the core rod has a notch on one side of the instrument cavity. Before the medical syringe is used, the injection needle is placed into the instrument cavity of the core rod; when the medical injector is used, the injection needle of the instrument chamber placed in the core rod is pinched at the hand-notch of the core rod. The tapered lip, the needle is taken out from the lateral opening of the instrument cavity; after the medical syringe is used, the injection needle inserted in the cone of the outer casing is removed, and then the needle is opened from the lateral opening of the instrument cavity Disposing into the instrument cavity of the core rod, and then pushing the core rod to the bottom, most of the core rods enter the outer casing, so as to achieve the purpose of the overall volume of the finally formed safety medical injector is small, thereby facilitating subsequent destruction processing.

The medical syringe with the instrument cavity of the invention realizes the interface of the injection needle composed of the cone head and the tapered slope of the outer sleeve and the tapered lip and the tapered hole of the injector, and the cone of the injection needle is inserted into the sleeve of the jacket When the head is on, the injection needle is fixed on the cone of the outer sleeve to avoid the purpose of oscillating the needle tip of the injection needle when the injection needle is inserted into the muscle or blood vessel of the human body, thereby avoiding an operation error; after the medical syringe is used, Just pinch the needle away from the needle Conical lip, the injection needle can be separated from the cone of the outer casing of the medical syringe, and the infected needle can be placed in the collection box, or the infected needle can be collected into the instrument cavity of the medical syringe. Avoid contact with the needle during operation to prevent the infected needle from injuring the human body.

The medical syringe with the instrument cavity of the invention realizes that the core rod has a laterally open device cavity into which the injection needle can be placed, and the handle of the core rod has a notch on the side of the device cavity, and the rear part of the outer wall of the outer casing is The same side of the instrument cavity of the core rod has an axial needle guiding groove; the interface between the cone and the tapered slope of the outer sleeve and the tapered lip and the tapered hole of the injection needle is realized; The portion has a convex locking circumferential projection, the outer circumference of the core rod has a locking circumferential groove, and the rear end of the locking circumferential groove of the core rod has a circumferential protection projection, and the locking circumferential projection in the outer casing cavity The locking circumferential projections that can be elastically deformed past the core rod enter the locking circumferential groove of the core rod. Before the medical syringe is used, the injection needle is placed into the instrument cavity of the core rod; when the medical injector is used, the injection needle of the instrument chamber placed in the core rod is pinched at the hand-notch of the core rod. Conical lip, take the injection needle from the lateral opening of the instrument cavity and insert it into the cone of the outer sleeve; after the medical syringe is used, pinch the conical lip of the injection needle away from the needle, the injection needle can be separated from the medical The tip of the sleeve of the syringe moves the needle tip of the needle along the needle guiding groove until the needle is inserted into the instrument chamber of the core rod from the lateral opening of the instrument chamber of the core rod to prevent the needle from entering. In the instrument cavity of the core rod, the body is stabbed by the tip of the needle before the core rod is pushed to the bottom, and most of the core rod enters the outer sleeve, and then the core rod is rotated to elastically deform the locking circumferential protrusion in the outer sleeve cavity over the core. After the locking axial projection of the rod enters the locking circumferential groove of the core rod, the injection needle in the appliance cavity of the core rod and the core rod is locked in the outer casing cavity, and at this time, the circumferential protection convex cover covers Locking circumferential projections in the cavity of the jacket The rear end, to prevent the human has entered the lock of the circumference of the core rod from the core pin to pull the bump to the outer periphery of the locking cavity in the locking recess a circumferential groove. It not only achieves the purpose of not touching the needle during the operation, but also achieves the purpose of the overall size of the safe medical syringe which is finally formed, so as to avoid the serious injury caused by the injection of the bacteria and avoid being reused. It can also facilitate subsequent destruction processing.

The medical injector with the instrument cavity of the invention has a convex positioning circumferential projection at the rear of the outer casing cavity, and the outer circumference of the core rod has positioning axial projections and a plurality of positionings arranged along the axial direction of the core rod. Circumferential groove. When the core rod is rotated such that the positioning circumferential projections in the outer casing cavity are elastically deformed beyond the positioning axial projections of the core rod into the selected positioning circumferential grooves of the core rod, the core rods constrained in the outer casing cavity The chamber between the front end of the sealing ring and the bottom of the outer casing cavity forms a selected liquid filling capacity of the medical injector; when the core rod is rotated, the positioning circumferential projection in the outer casing cavity is elastically deformed over the positioning of the core rod After the circumferential groove is removed from the positioning circumferential groove of the core rod, the manipulation of the mandrel can cause the sealing ring to move back and forth in the outer casing cavity; the pre-filled liquid amount of the medical injector can be accurately locked. During operation, the positioning circumferential projections within the outer casing cavity are audibly deformed to indicate that the operational state of the medical injector has been altered.

The medical syringe with the instrument cavity of the present invention realizes a safety disposable single-use sterile syringe or a safe self-destructing single-use sterile syringe, and the parts of the sheath of the injection needle are one less than the conventional single-use sterile syringe. The structure of the filling chamber of the medical injector of the present invention is the same as that of the conventional single-use sterile syringe. The medical injector of the invention not only achieves the purpose of eliminating the gas in the filling chamber and facilitating assembly, but also achieves production cost and Conventional single-use sterile syringes are produced at similar costs and are much less expensive to produce than existing safe single-use sterile syringes or safe self-destructing single-use sterile syringes.

It can be seen that the above stated objectives, including those shown by the foregoing description, are effectively achieved. It is. The present invention has been described in terms of a typical preferred embodiment of the present invention, and it is possible to make some changes to the above-described structure without departing from the spirit and scope of the invention. The present invention is not limited to or limited to the specific details set forth herein, and any modifications or variations that are obvious to those skilled in the art will be made as set forth in the claims.

Claims (11)

1. A medical syringe with an instrument cavity, comprising a jacket, a core rod and an injection needle;

   The outer casing has a casing cavity, the outer casing cavity is respectively open at the front and rear ends of the outer casing, the front end of the outer casing cavity has a sealing bottom, and the front end of the sealing bottom of the outer casing cavity has a cone head, the cone a cone hole is formed in the head, the cone hole is penetrated through the outer casing cavity, and a jacket curl is arranged at the rear of the jacket, and a capacity scale is arranged on the outer surface of the jacket;

   The rear end of the core rod has a handle, and the front portion has a sealing ring; after the sealing ring of the core rod is inserted into the outer casing cavity from the rear end opening of the outer casing cavity, the handle of the core rod can be manipulated to seal The ring moves back and forth in the cavity of the outer casing, and the outer wall of the sealing ring forms a sealing fit with the inner wall of the outer casing cavity;

   The utility model is characterized in that: one side of the core rod has a laterally open instrument cavity, and the rear end of the instrument cavity has a cavity inner circumferential groove into which the injection needle can be placed.
2. The medical syringe with an instrument cavity according to claim 1, wherein the injection needle is inserted into the cone of the outer casing, and the rear end of the cone of the outer casing has a tapered slope and a rear portion of the injection needle. a tapered lip and a tapered bore, the tapered lip of the injection needle being located at the rear of the tapered bore, the circumference of the lateral opening of the circumferential groove of the lumen of the lumen of the appliance The width is smaller than the diameter of the tapered lip of the injection needle and the diameter of the circumferential groove of the lumen of the instrument cavity; when the injection needle is placed into the instrument cavity of the core rod, the tapered lip of the injection needle is elastically deformed past the appliance At a lateral opening of the circumferential groove of the cavity, into the circumferential groove of the cavity of the instrument cavity, such that the tapered lip of the injection needle is restrained in the circumferential groove of the cavity of the instrument cavity, and the injection needle is restrained in the cavity of the instrument When the tapered hole of the injection needle is inserted into the cone of the outer sleeve, the injection needle is fixed on the cone of the outer sleeve; when the tapered lip of the injection needle is pinched, the tapered lip is behind the cone of the outer sleeve The tapered bevel of the end moves so that the tapered lip pushes the needle forward The taper of the needle is removed from the taper of the outer sleeve.
3. The medical syringe with an instrument cavity according to claim 1, wherein the handle of the core rod has a notch on a side of the instrument cavity, and the back of the injection needle has a tapered lip And a tapered hole, the tapered lip of the injection needle being located at the rear of the tapered hole; before the medical injector is used, the injection needle is placed into the instrument cavity of the core rod; When used, the conical lip of the injection needle placed in the instrument cavity of the mandrel is pinched at the notch of the mandrel of the mandrel, and the needle is taken out from the lateral opening of the instrument cavity The tapered hole of the injection needle is then inserted into the cone of the outer sleeve such that the injection needle is fixed to the cone of the outer sleeve.
4. The medical syringe with an instrument cavity according to claim 1, wherein the rear portion of the outer casing cavity has a convex positioning circumferential projection, and the axially opposite sides of the positioning circumferential projection respectively a convex axially constraining inclined surface, wherein the circumferential circumferential sides of the positioning circumferential convex respectively have a convex circumferentially constraining inclined surface; the outer circumference of the core rod has a positioning circumferential groove, and the plurality of the positioning circumferential grooves are along the core rod The axial arrangement is arranged, and the axially opposite sides of each positioning circumferential groove respectively have a groove axially constraining inclined surface, and the circumferential circumferential sides of each positioning circumferential groove respectively have a groove circumferentially constraining inclined surface, and the circumferential side of the positioning circumferential groove is positioned. An axial protrusion having a circumferentially constrained slope of the circumferential direction of the positioning axial projection; when the core rod is rotated, the positioning circumferential projection in the outer casing cavity is elastically deformed over the positioning axial projection of the core rod After the lug circumferentially constraining the bevel into the selected positioning circumferential groove of the core rod, the two circumferentially constrained inclined surfaces of the selected positioning circumferential groove of the core rod are respectively in the outer casing cavity Locating two of the convexities of the circumferential bump Block circumferential constraint The bevels are mutually constrained to block rotation of the core rod within the outer casing cavity, and the two axially constrained inclined surfaces of the selected positioning circumferential groove of the core rod respectively correspond to the positioning circumferential projections in the outer casing cavity The protrusions of the axially constraining slopes are mutually constrained, and the sealing ring of the core rod is hindered from moving back and forth in the outer casing cavity, and the front end of the sealing ring of the core rod and the back cover of the outer casing cavity are restrained in the outer casing cavity. The chamber between the portions forms a selected liquid filling capacity of the medical injector; when the core rod is rotated, the positioning circumferential projections in the outer casing cavity are elastically deformed over the circumferential circumferentially constraining slope of the positioning circumferential groove of the core rod After the positioning circumferential groove of the core rod is removed, the positioning of the core rod of the axial projection of the axial projection constrains the inclined surface to block the positioning of the circumferential projection in the outer casing cavity into the positioning circumferential groove of the core rod, and the operation of the core rod Pressing the hand causes the seal to move back and forth within the jacket cavity.
5. The medical syringe with an instrument cavity according to claim 1, wherein the rear portion of the outer casing cavity has a convex locking circumferential projection, and the axial direction of the locking circumferential projection has The convex portion axially constrains the inclined surface, and the circumferential circumferential sides of the locking circumferential protrusion respectively have a convex circumferentially inclined inclined surface; the outer circumference of the core rod has a locking circumferential groove, and the axial direction of the locking circumferential groove is concave The groove axially constrains the inclined surface, and the circumferential circumferential sides of the locking circumferential groove respectively have a groove circumferentially constraining inclined surface, and the circumferential side of the locking circumferential groove has a locking axial convex piece; when the rotating core rod is turned into the outer cavity of the outer casing After the locking circumferential projection elastically deforms over the locking axial projection of the core rod into the locking circumferential groove of the core rod, the groove of the locking circumferential groove of the core rod axially constrains the inclined surface and the outer casing cavity The lug axially constraining bevels of the locking circumferential lugs are mutually constrained, and the two circumferentially constrained inclined faces of the locking circumferential groove of the core rod respectively and the locking circumferential lugs in the outer casing cavity The two circumferentially constrained ramps of the two of the bumps are constrained to each other such that the core rod is locked to the outer casing cavity.
6. The medical syringe with an instrument cavity according to claim 1, wherein the rear portion of the outer casing cavity has a convex locking circumferential projection, and the axial direction of the locking circumferential projection has The convex portion axially constrains the inclined surface, and the circumferential circumferential sides of the locking circumferential protrusion respectively have a convex circumferentially inclined inclined surface; the outer circumference of the core rod has a locking circumferential groove, and the axial direction of the locking circumferential groove is concave The groove axially constrains the inclined surface, and the circumferential circumferential sides of the locking circumferential groove respectively have a groove circumferentially constraining inclined surface, and the axial side surface of the locking circumferential groove has a locking circumferential convex piece; when the core rod is pushed, the inside of the casing cavity is driven After the locking circumferential projection elastically deforms over the locking circumferential projection of the core rod into the locking circumferential groove of the core rod, the groove of the locking circumferential groove of the core rod axially constrains the inclined surface and the outer casing cavity The lug axially constraining bevels of the locking circumferential lugs are mutually constrained, and the two circumferentially constrained inclined faces of the locking circumferential groove of the core rod respectively and the locking circumferential lugs in the outer casing cavity The two circumferentially constrained ramps of the two of the bumps are constrained to each other such that the core rod is locked to the outer casing cavity.
7. The medical syringe with an instrument cavity according to claim 1, wherein the rear portion of the outer casing cavity has a convex locking circumferential projection, and the outer periphery of the core rod has a locking circumferential groove. The rear end of the locking circumferential groove of the core rod has a circumferential protection protrusion; when the locking circumferential protrusion in the outer casing cavity enters the locking circumferential groove of the core rod, the circumferential protection convex The block covers the rear end of the locking circumferential projection in the outer casing cavity.
8. The medical syringe with an instrument cavity according to claim 1, wherein an axial injection needle guiding groove is provided on the same side of the outer wall of the outer casing and the appliance cavity of the core rod; After the injection needle on the cone of the outer sleeve is removed, the needle tip of the injection needle is moved backward along the injection needle guiding groove until the injection needle enters the core rod from the lateral opening of the instrument cavity of the core rod. The device is inside the cavity.
9. A medical syringe with an instrument cavity according to claim 8, wherein said injection needle guiding groove has axial ribs on both sides; said injection needle inserted in a taper of said outer casing After being removed, the needle of the needle will be injected The tip moves backward along the injection needle guiding groove, and the ribs on both sides of the injection needle guiding groove prevent the needle tip of the injection needle from sliding out of the injection needle guiding groove when moving backward along the injection needle guiding groove until the injection needle is from the core rod The lateral opening of the appliance cavity enters the instrument cavity of the core rod.
10. The medical syringe with an instrument cavity according to claim 9, wherein the ribs on both sides of the injection needle guiding groove are located on the front side of the outer casing of the outer casing, and the ribs on both sides of the injection needle guiding groove The outer walls of the strip and the outer sleeve constitute the injection needle guiding groove.
11. The medical syringe with an instrument cavity according to claim 8, wherein a rear portion of the injection needle guiding groove penetrates a wall of a rear side of the outer casing of the outer casing to form a slit; when inserted in the After the injection needle on the cone of the outer sleeve is removed, the needle tip of the injection needle is moved backward along the injection needle guiding groove to the gap at the rear of the injection needle guiding groove, so that the needle of the injection needle from the core rod is The lateral opening of the cavity enters the instrument cavity of the core rod.

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