Pressure display injector

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a pressure display injector which comprises a sleeve and a core rod, a rubber plug extending into the sleeve is arranged on the core rod, the middle of the rubber plug is naturally arched, and a containing cavity extending in the axial direction of the core rod is formed in the end face of the head end of the core rod. A floating needle and a reset spring pushing the floating needle to abut against the rubber plug are arranged in the containing cavity, the depth of the floating needle in the containing cavity is in positive correlation with the pressure in the rodless cavity of the sleeve, scales are marked on the floating needle in the axial direction, a datum line is marked on the core rod, and the numerical value, aligned with the datum line, of the scales reflects the real-time pressure in the rodless cavity of the sleeve. According to the pressure display injector, the displacement of the floating needle is quantified through scales according to the principle that the pressed rubber plug elastically deforms to drive the floating needle to move relative to the core rod, so that the pressure in the rodless cavity of the sleeve is visually reflected, and an operator can control the propelling speed and smoothly complete injection.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a pressure display syringe. Background Art

[0002] Severely ill patients or others who are unable to eat usually need to be fed through a gastric tube. Liquid food is fed through the tube to ensure that the patient takes in enough nutrition. This requires the use of a dedicated syringe. When feeding patients, pushing liquid food requires certain skills. Pushing too quickly can easily cause the patient's stomach to bloat or choke. Pushing too quickly will put greater pressure on the syringe core rod. If the push speed is directly controlled by the reaction force of the core rod, it is very difficult. Novice caregivers often find it difficult to grasp the appropriate scale, so this needs to be improved. Utility Model Content

[0003] Based on the above problems, the purpose of the present invention is to provide a pressure display syringe to intuitively reflect the pressure in the syringe cavity, making it convenient for the operator to control the propulsion speed and meet the injection requirements.

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

[0005] A pressure display syringe comprises a sleeve and a core rod. A rubber plug extending into the sleeve is provided on the core rod, and the middle part of the rubber plug is naturally arched. A cavity extending along the axial direction of the core rod is provided on the head end surface of the core rod. A floating needle and a reset spring for pushing the floating needle against the rubber plug are provided in the cavity. The depth of the floating needle in the cavity is positively correlated with the pressure in the rodless cavity of the sleeve. The floating needle is marked with a scale along the axial direction, and the core rod is marked with a reference line. The value of the scale aligned with the reference line reflects the real-time pressure in the rodless cavity of the sleeve.

[0006] As an optional solution, the sleeve and core rod are made of transparent material, and the floating needle is made of hard non-transparent material.

[0007] As an optional solution, the end of the floating needle abuts against the middle inner wall of the rubber plug, and the rubber plug is always in an elastic deformation state when subjected to the pressure of the rodless cavity of the sleeve or the top pressure of the floating needle.

[0008] As an optional solution, a slot is provided at the head end of the core rod, and the edge of the rubber plug is interference fit into the slot.

[0009] The beneficial effects of the present invention are as follows: the pressure display syringe quantifies the displacement of the floating needle through a scale according to the principle that the pressurized rubber stopper undergoes elastic deformation and thereby drives the floating needle to move relative to the core rod, thereby intuitively reflecting the pressure in the rodless cavity of the sleeve, so that the operator can control the propulsion speed and complete the injection smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of a pressure display syringe provided by an embodiment of the present utility model;

[0011] Figure 2 It is a cross-sectional view of a pressure display syringe provided by an embodiment of the present utility model.

[0012] In the attached figure:

[0013] 1. Sleeve; 2. Core rod; 3. Rubber plug; 4. Cavity; 5. Floating needle; 6. Return spring; 7. Scale; 8. Reference line; 9. Slot. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0015] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0016] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0017] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0018] See also Figure 1 and Figure 2 As shown, the present preferred embodiment provides a pressure display syringe, comprising a sleeve 1 and a core rod 2, wherein a rubber plug 3 extending into the sleeve 1 is provided on the core rod 2, the middle part of the rubber plug 3 is naturally arched, and a cavity 4 extending along the axial direction of the core rod 2 is provided on the head end face of the core rod 2, a floating needle 5 and a return spring 6 for pushing the floating needle 5 against the rubber plug 3 are provided in the cavity 4, the depth of the floating needle 5 in the cavity 4 is positively correlated with the pressure in the rodless cavity of the sleeve 1, a scale 7 is marked on the floating needle 5 along its own axial direction, and a reference line 8 is marked on the core rod 2, and the value of the scale 7 aligned with the reference line 8 reflects the real-time pressure in the rodless cavity of the sleeve 1.

[0019] It should be noted that the pressure generated during injection pushing is instantaneous pressure, which will gradually decrease over time. If the core rod 2 is pushed too fast, the pressure in the rodless cavity of the sleeve 1 will continue to accumulate, causing damage to the human body. Therefore, according to the scale 7 on the floating needle 5, the pushing speed of the core rod 2 can be controlled so that the pressure in the rodless cavity of the sleeve 1 is maintained within an appropriate range, which is convenient for the operator to operate.

[0020] Therefore, according to the principle that the pressurized rubber plug 3 undergoes elastic deformation and thus drives the floating needle 5 to move relative to the core rod 2, the displacement of the floating needle 5 is quantified by the scale 7, thereby intuitively reflecting the pressure in the rodless cavity of the sleeve 1, so that the operator can control the propulsion speed and complete the injection smoothly.

[0021] In particular, the sleeve 1 and the core rod 2 are both made of transparent materials to facilitate observation of the scale 7; the floating needle 5 is made of hard non-transparent material, such as hard rubber, hard plastic, wood, etc., which not only meets the transmission requirements but also can clearly display the scale 7.

[0022] In particular, the end of the floating needle 5 rests against the middle inner wall of the plug 3. The plug 3 is always in an elastic deformation state when it is subjected to the pressure of the rodless cavity of the sleeve 1 or the top pressure of the floating needle 5, avoiding damage to the plug 3 and affecting the pressure feedback accuracy.

[0023] Specifically, a slot 9 is provided at the head end of the core rod 2 , and the edge of the rubber plug 3 is interference fit into the slot 9 , ensuring that the rubber plug 3 is reliably assembled.

[0024] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pressure display syringe, comprising a sleeve (1) and a core rod (2), wherein the core rod (2) is provided with a rubber plug (3) extending into the sleeve (1), characterized in that: The middle part of the rubber plug (3) is naturally arched, and a cavity (4) extending along the axial direction of the core rod is provided on the head end surface of the core rod (2). A floating needle (5) and a return spring (6) for pushing the floating needle (5) against the rubber plug (3) are provided in the cavity (4). The depth of the floating needle (5) in the cavity (4) is positively correlated with the pressure in the rodless cavity of the sleeve (1). A scale (7) is marked axially on the floating needle (5), and a reference line (8) is marked on the core rod (2). The value of the scale (7) aligned with the reference line (8) reflects the real-time pressure in the rodless cavity of the sleeve (1).

2. The pressure display syringe according to claim 1, characterized in that: The sleeve (1) and the core rod (2) are both made of transparent material, and the floating needle (5) is made of hard non-transparent material.

3. The pressure display syringe according to claim 1, characterized in that: The end of the floating needle (5) abuts against the middle inner wall of the rubber plug (3), and the rubber plug (3) is always in an elastic deformation state when subjected to the pressure of the rodless cavity of the sleeve (1) or the top pressure of the floating needle (5).

4. The pressure display syringe according to claim 1, characterized in that: A clamping groove (9) is provided at the head end of the core rod (2), and the edge of the rubber plug (3) is interference fit into the clamping groove (9).

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