Dynamic weight percussion hammer

Abstract

This invention discloses a dynamic counterweight percussion hammer, relating to the field of medical device technology. It includes a hammerhead and a handle laterally connected to the hammerhead. The hammerhead comprises a hollow cylindrical shell and striking heads at both ends of the shell. A connecting ring is threaded to the inner wall of the shell, and multiple elastic ropes extend radially from the inner wall of the connecting ring. A counterweight is connected to the ends of the multiple elastic ropes to form a suspension structure. The counterweight shifts hysterically along the direction of the percussion due to the elastic deformation of the elastic ropes, providing dynamic counterweight for the hammerhead's percussion force and extending the duration of the percussion force. When the percussion force is applied to any striking head, the counterweight automatically shifts towards the force-bearing side, forming a dynamic counterweight in the same direction as the percussion, thus improving the success rate of triggering deep reflections. Furthermore, the hysteretic shift of the counterweight through the elastic deformation of the elastic ropes transforms the instantaneous impact force of traditional rigid percussion into a continuous buffering force, reducing the impact intensity felt by the patient.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a dynamic counterweight percussion hammer. Background Technology

[0002] In medical diagnosis, the percussion hammer is an indispensable basic tool. Doctors use it to tap specific parts of a patient's body and assess their health based on the resulting reflex responses, such as in the common knee-jerk reflex test. Most percussion hammers on the market today have a relatively simple structure, typically consisting of a hammerhead with a fixed weight and a handle.

[0003] Existing percussion hammers are designed with little consideration for patient comfort, potentially causing discomfort or even injury during the percussion process. Because traditional percussion hammers typically have a rigid hammerhead, and the weight of the entire hammerhead is concentrated on the area being percussed, patients with delicate skin, fragile bones, or weak constitutions, such as children undergoing neurological examinations, may experience fear and resistance from the percussion hammer. This not only hinders the examination but may also negatively impact the child's psychological well-being. Furthermore, the significant impact force generated by traditional percussion hammers may elicit involuntary reactions in the patient, interfering with the doctor's accurate observation and judgment of these reflexes, further reducing diagnostic accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a dynamic counterweight percussion hammer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dynamic counterweight percussion hammer, comprising a hammer head and a handle laterally connected to the hammer head, wherein the hammer head comprises a hollow cylindrical shell and striking heads disposed at both ends of the shell; A connecting ring is threaded to the inner wall of the housing, and multiple elastic ropes are arranged radially on the inner wall of the connecting ring. A counterweight is connected to the ends of multiple elastic ropes to form a suspension structure, and the counterweight can freely shift along the axial direction of the shell. When the striking force is applied to the striking head, the counterweight is shifted hysterically along the direction of the strike due to the elastic deformation of the elastic rope. This creates a dynamic counterweight for the hammer striking force. At the same time, the duration of the striking force is extended, creating a buffering effect to reduce involuntary reactions from the patient.

[0006] In a further embodiment, the counterweight has multiple notches on its radial sidewall, and each notch and the inner wall of the connecting ring are provided with a connecting buckle. The opening direction of the notch is parallel to the axial direction of the shell. When the connecting buckles of the inner wall of the notch and the inner wall of the connecting ring are tied together with the two ends of the elastic rope, a suspension path extending along the axial direction of the shell is formed.

[0007] In a further embodiment, when the striking head at either end acts on the patient's body surface along the axial direction of the housing to perform a tapping motion, the counterweight is shifted towards the striking head on the force-bearing side by the elastic deformation of the elastic rope, thereby adjusting the counterweight closer to the striking head on the force-bearing side and providing dynamic counterweight in the same direction as the tapping direction.

[0008] In a further embodiment, the tensile deformation of the elastic rope is less than half of the axial length of the shell. When the tensile deformation of the elastic rope is maximized, the offset of the counterweight is maximized, and a gap is left between the counterweight and the axial end of the shell.

[0009] In a further embodiment, the housing has an open structure at one axial end and a closed structure at the other end. The open structure of the housing is threadedly connected to a housing cover. The end of the housing cover facing away from the housing extends to a hollow connecting end. The housing has a connection port on the end sidewall of the closed structure. The striking head is provided with a connector, one of the striking heads is threaded to the hollow connecting end, and the other striking head is threaded to the connecting port.

[0010] In a further embodiment, a guide slide rod is fixed at the center of one end of the shell cover facing the inside of the shell. The counterweight block has an axially formed sleeve hole for the guide slide rod to pass through. A guide sheet is fixed to the radial sidewall of the sleeve hole. The guide sheet has an axially formed guide hole for the guide slide rod to slide and fit on the outer wall. The guide sheet provides offset guidance for the counterweight block to shift axially along the guide slide rod.

[0011] In a further embodiment, the outer wall of the guide slide rod is provided with two annular snap-fit ​​parts, and the two annular snap-fit ​​parts are fixedly fitted with rubber rings of the same size as the outer diameter of the guide slide rod. The two rubber rings are symmetrically distributed with the connecting ring as the center. When the elastic rope has no tensile deformation, the counterweight is set at the same height as one of the rubber rings. The height of the rubber ring is equal to the axial length of the counterweight, and the rubber ring provides sliding resistance when the guide sheet is reset.

[0012] In a further embodiment, the striking head is a flexible striking head, which is made of silicone or medical-grade elastomer material and has a surface hardness of 30-60 Shore A. In a further embodiment, one of the two tapping heads has a large tapping coverage area, and the other has a small tapping coverage area; A tapping head with a large coverage area is used for the extensor reflexes of the knee reflex and triceps reflex, while a tapping head with a small coverage area is used for the flexor reflexes of the biceps reflex.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention is a dynamic counterweight percussion hammer. When the percussion force is applied to any striking head, the counterweight automatically shifts to the side of the force, forming a dynamic counterweight in the same direction as the percussion direction. This improves the success rate of triggering deep reflection. Moreover, the counterweight produces a hysteretic shift through the elastic deformation of the elastic rope, transforming the instantaneous impact force of traditional rigid percussion into a continuous buffering force, reducing the impact intensity felt by the patient. It is especially suitable for sensitive groups such as children and the elderly.

[0014] 2. The present invention provides guidance and support for the offset of the counterweight by setting a guide slide rod, so as to avoid the counterweight from touching the radial side wall of the shell, which would cause the counterweight weight to fail to reach the preset requirement. At the same time, a rubber ring is set on the guide slide rod, which can provide sliding resistance to shorten the reset time of the counterweight and avoid inspection errors caused by repeated shaking of the counterweight when tapping multiple times. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram showing the disassembled structure of the hammer head of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the shell and counterweight components in a half-section of the present invention; Figure 4 This is a static schematic diagram of the counterweight component of the present invention; Figure 5 This is a dynamic schematic diagram of the counterweight component of the present invention; Figure 6 This is a schematic diagram of the assembly structure of the shell cover, guide slide rod and counterweight of the present invention; Figure 7 This is a schematic diagram of a further improved structure of the shell cover and guide slide rod of the present invention; Figure 8 This is a half-sectional view of the counterweight block of the present invention.

[0016] In the diagram: 1. Shell; 11. Shell cover; 12. Hollow connecting end; 13. Guide slide rod; 14. Rubber ring; 2. Handle; 3. Striking head; 31. Joint; 4. Connecting ring; 41. Elastic rope; 5. Counterweight; 51. Notch; 52. Guide plate. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This embodiment provides a dynamically weighted percussion hammer, such as... Figure 1 and Figure 2 As shown, it includes a hammer head and a handle 2 that is laterally connected to the hammer head. The hammer head includes a hollow cylindrical shell 1 and striking heads 3 disposed at both ends of the shell 1.

[0019] Specifically, such as Figure 3 As shown, the housing 1 has an open structure at one end and a closed structure at the other end. The open structure of the housing 1 is threadedly connected to a cover 11. A hollow connecting end 12 extends from the end of the cover 11 opposite to the housing 1. A connection port is provided on the side wall of the closed structure end of the housing 1. The striking head 3 is provided with a connector 31. One of the striking heads 3's connectors 31 is threadedly connected to the hollow connecting end 12, and the other striking head 3's connector 31 is threadedly connected to the connection port.

[0020] The tapping head 3 is a flexible tapping head made of silicone or medical-grade elastomer material. One tapping head 3 has a large tapping coverage area, and the other has a small tapping coverage area. The tapping head 3 with the large coverage area is used for the extensor reflexes of the knee reflex and triceps reflex, while the tapping head 3 with the small coverage area is used for the flexor reflexes of the biceps reflex.

[0021] During percussion, the doctor holds the handle 2 and selects the appropriate percussion head 3, with either a large or small coverage area, based on the specific percussion needs. The head is then positioned on the patient's body surface; for example, a large-coverage percussion head 3 is used for the knee reflex, while a small-coverage percussion head 3 is used for the elbow reflex. Simultaneously, the doctor applies appropriate force, directing the selected percussion head 3 along the axis of the housing 1 onto the patient's body surface. Careful control of force and frequency is crucial to ensure both accuracy and patient comfort.

[0022] To meet the requirements of dynamic counterweight, this embodiment also discloses a connecting ring 4 threaded to the inner wall of the housing 1 and a counterweight block 5, such as... Figure 3 As shown, the connecting ring 4 is rotated and adjusted to the middle position inside the housing 1. Multiple elastic ropes 41 extend radially along the inner wall of the connecting ring 4. Four or six elastic ropes 41 are evenly distributed radially along the housing 1. The elastic modulus of the elastic ropes 41 is 0.2-0.8 MPa, ensuring that each elastic rope 41 will not deform after being pre-stretched by 10%. A counterweight 5 is connected to the ends of the multiple elastic ropes 41 to form a suspension structure. The counterweight 5 can freely offset along the axial direction of the housing 1.

[0023] In addition, the surface hardness of the striking head 3 is 30-60 Shore A, with 40 Shore A being preferred. This material has moderate softness, preventing excessive deformation during tapping, absorbing some impact energy, reducing patient pain, and not affecting energy transmission. The reflected signal is clear and not subject to much interference. The weight 5 weighs 15-40 grams, and its weight directly affects the inertia during tapping. A lighter weight (15-25 grams) is suitable for scenarios requiring rapid, gentle tapping (such as facial reflex examinations), while a heavier weight (30-40 grams) can enhance the triggering effect of deep reflexes (such as the Achilles tendon reflex). The weight 5 generates hysteresis offset through the deformation of the elastic rope. The greater the weight, the longer the hysteresis time, which prolongs the duration of the tapping force, reduces involuntary patient reactions (such as muscle contraction interference), and improves examination stability. Therefore, doctors can choose different weights of the weight 5 to meet the examination requirements.

[0024] The inventors discovered through clinical practice that the following combinations are suitable for examinations: Low hardness + light weight: Suitable for superficial reflexes or pain-sensitive areas. The flexible tapping head 3 absorbs some energy, and the light weight reduces overall impact, achieving a "light touch" examination. High hardness + heavy weight: Suitable for deep reflexes or areas with thick muscles. The hard tapping head 3 ensures energy transfer, and the heavy weight enhances inertia, overcoming muscle resistance and clearly triggering reflex signals. An intermediate combination (e.g., 40 Shore A + 25 grams): Offers the greatest versatility, covering most routine examination scenarios and balancing operational comfort and signal accuracy.

[0025] Specifically, such as Figure 3 and Figure 4 As shown, the counterweight 5 has multiple notches 51 on its radial sidewalls. Each notch 51 and the inner wall of the connecting ring 4 are provided with a connecting buckle. The opening direction of the notch 51 is parallel to the axial direction of the shell 1. When the connecting buckles on the inner walls of the notch 51 and the inner walls of the connecting ring 4 are tied to the two ends of the elastic rope 41, a suspension path extending along the axial direction of the shell 1 is formed. When the striking force is applied to the striking head 3, the counterweight 5 undergoes a delayed offset along the striking direction due to the elastic deformation of the elastic rope 41, which provides dynamic counterweight for the hammer striking force. At the same time, the striking force application time is extended, forming a buffering effect to reduce involuntary reactions of the patient.

[0026] When the striking head 3 at either end acts on the patient's body surface along the axial direction of the housing 1 to strike, the counterweight 5 shifts towards the striking head 3 on the force-bearing side due to the elastic deformation of the elastic rope 41. Figure 5 The diagram shows the stretching and deformation of the elastic rope 41, which in turn adjusts the counterweight 5 to the striking head 3 on the force-bearing side, providing dynamic counterweight in the same direction as the striking direction.

[0027] For example, when the large-coverage striking head 3 strikes along the axial direction of the housing 1, the elastic rope 41 undergoes elastic deformation synchronously due to the offset of the counterweight 5. The counterweight 5 shifts along the guide slide rod 13 through the notch 51 towards the large-coverage striking head 3. The shift in the center of gravity of the counterweight 5 creates a dynamic counterweight enhancement effect, increasing the effective striking mass and significantly extending the striking force application time compared to a traditional percussion hammer, thus reducing the impact intensity felt by the patient. The counterweight 5 oscillates with a lag along the striking direction, unlike traditional fixed counterweights, achieving dynamic compensation of impact force.

[0028] Similarly, when the small-coverage tapping head 3 strikes, the counterweight 5 shifts in the opposite direction. The dynamic counterweight enhancement effect and the extensor reflex triggering mechanism are the same as the tapping method of the large-coverage tapping head 3 along the axis of the shell 1, thus achieving accurate detection of the flexor reflex.

[0029] It should be emphasized that the tensile deformation of the elastic rope 41 is less than half of the axial length of the shell 1. When the tensile deformation of the elastic rope 41 is maximized, the offset of the counterweight 5 is maximized, and there is a gap between the counterweight 5 and the axial end of the shell 1. The purpose of this design is that even when the tensile deformation of the elastic rope 41 is maximized, the counterweight 5 will not touch the side wall of the axial end of the shell 1, and thus no abnormal noise will be generated.

[0030] In this embodiment, further, such as Figure 6 and Figure 8 As shown, a guide slide rod 13 is fixed at the center of one end of the cover 11 facing the inside of the housing 1. The counterweight 5 has an axially opened sleeve hole for the guide slide rod 13 to pass through. A guide plate 52 is fixed on the radial side wall inside the sleeve hole. The guide plate 52 has an axially opened guide hole for sliding sleeve on the outer wall of the guide slide rod 13. The guide plate 52 provides offset guidance for the counterweight 5 to offset along the axial direction of the guide slide rod 13.

[0031] In addition, such as Figure 7 and Figure 8 As shown, the outer wall of the guide slide rod 13 is provided with two annular locking parts, and the two annular locking parts are fixedly fitted with rubber rings 14 of the same size as the outer diameter of the guide slide rod 13. The two rubber rings 14 are symmetrically distributed with the connecting ring 4 as the center. When the elastic rope 41 has no tensile deformation, the counterweight 5 is set at the same height as one of the rubber rings 14. Figure 4 The image shows the elastic cord 41 in its unstretched state. After the impact force disappears, the elastic cord 41 returns to its initial deformed state due to its own elasticity. Under the sliding resistance of the rubber ring 14, the counterweight 5 can quickly return to the position of the shell 1 and the rubber ring 14 at the same height.

[0032] The guide sheet 52 slides in conjunction with the guide slide rod 13 to ensure that when the counterweight 5 slides off-center, the rubber counterweight 5 does not generate a component force that deviates from the axial direction of the guide slide rod 13.

[0033] The height of the rubber ring 14 is equal to the axial length of the counterweight 5. The rubber ring 14 provides sliding resistance when the guide plate 52 is reset. The purpose of this design is that the rubber ring 14 has sufficient height, i.e., sufficient sliding contact surface, to slide into contact with the guide plate 52 in the socket of the reset counterweight 5. This provides sufficient contact surface to generate sliding resistance, enabling the counterweight 5 to quickly reset and come to rest, preparing for the next tapping and preventing the counterweight 5 from repeatedly shaking, which would affect the accuracy of the tapping inspection.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dynamic counterweight percussion hammer, characterized in that, include: Hammer head and a handle (2) that is laterally connected to the hammer head, the hammer head including a hollow cylindrical shell (1) and striking heads (3) disposed at both ends of the shell (1); A connecting ring (4) is threaded to the inner wall of the housing (1), and multiple elastic ropes (41) are provided on the inner wall of the connecting ring (4) extending radially. The counterweight (5) is connected to the ends of multiple elastic ropes (41) to form a suspension structure. The counterweight (5) can freely shift along the axial direction of the shell (1). When the striking force is applied to the striking head (3), the counterweight (5) is deflected in the direction of the strike by the elastic deformation of the elastic rope (41), which is a dynamic counterweight for the hammer striking force, and the striking force is extended at the same time.

2. The dynamic counterweight percussion hammer according to claim 1, characterized in that, The counterweight (5) has multiple notches (51) on its radial sidewall, and each notch (51) and the inner wall of the connecting ring (4) are provided with a connecting buckle; The opening direction of the notch (51) is parallel to the axial direction of the shell (1). When the connecting buckles of the inner wall of the notch (51) and the inner wall of the connecting ring (4) are tied together with the two ends of the elastic rope (41), a suspension path extending along the axial direction of the shell (1) is formed.

3. The dynamic counterweight percussion hammer according to claim 1, characterized in that, When the striking head (3) at either end acts on the patient's body surface along the axial direction of the shell (1) to perform a tapping, the counterweight (5) shifts towards the striking head (3) on the force side through the elastic deformation of the elastic rope (41), thereby adjusting the counterweight (5) to be closer to the striking head (3) on the force side, providing dynamic counterweight in the same direction as the tapping direction.

4. The dynamic counterweight percussion hammer according to claim 1, characterized in that, The tensile deformation of the elastic rope (41) is less than half of the axial length of the shell (1). When the tensile deformation of the elastic rope (41) is maximized, the offset of the counterweight (5) is maximized, and a gap is left between the counterweight (5) and the axial end of the shell (1).

5. The dynamic counterweight percussion hammer according to claim 1, characterized in that, The shell (1) has an open structure at one end and a closed structure at the other end. The open structure of the shell (1) is threadedly connected to a shell cover (11). The shell cover (11) has a hollow connecting end (12) extending from the end opposite to the shell (1). The shell (1) has a connecting port on the end side wall of the closed structure. The striking head (3) is provided with a connector (31), one of the striking heads (3) has a connector (31) threadedly connected to the hollow connecting end (12), and the other striking head (3) has a connector (31) threadedly connected to the connecting port.

6. The dynamic counterweight percussion hammer according to claim 1, characterized in that, The cover (11) has a guide slide rod (13) fixed at the center of one end facing the inside of the shell (1). The counterweight (5) has a sleeve hole for the guide slide rod (13) to pass through in the axial direction. A guide plate (52) is fixed on the radial side wall of the sleeve hole. The guide plate (52) has a guide hole for sliding sleeve on the outer wall of the guide slide rod (13) in the axial direction. The guide plate (52) provides offset guidance for the counterweight (5) to offset along the axial direction of the guide slide rod (13).

7. The dynamic counterweight percussion hammer according to claim 6, characterized in that, The outer wall of the guide slide rod (13) is provided with two annular snap-fit ​​parts, and the two annular snap-fit ​​parts are fixedly fitted with rubber rings (14) of the same size as the outer diameter of the guide slide rod (13). The two rubber rings (14) are symmetrically distributed with the connecting ring (4) as the center. When the elastic rope (41) has no tensile deformation, the counterweight (5) is set at the same height as one of the rubber rings (14). The height of the rubber ring (14) is equal to the axial length of the counterweight (5), and the rubber ring (14) provides sliding resistance when the guide sheet (52) is reset.

8. The dynamic counterweight percussion hammer according to claim 1, characterized in that, The striking head (3) is a flexible striking head (3), which is made of silicone or medical-grade elastomer material.

9. The dynamic counterweight percussion hammer according to claim 8, characterized in that, The two striking heads (3) have different striking areas: one with a larger striking area and the other with a smaller striking area. The large-coverage tapping head (3) is used for the extensor reflexes of the knee reflex and triceps reflex, while the small-coverage tapping head (3) is used for the flexor reflexes of the biceps reflex.

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